Analysis Of Processes In A Petroleum Refinery Environmental Sciences Essay

Nynashamn oil refinery specialises in Naphthenic oils and Bitumen merchandises. It includes both mean energy intensive procedures which can be found in oil refinery industry. Other specific procedures besides arouse some other issues, adding to the planetary image a high potency for energy losingss and risky emanations.

The initial purpose of this study is to depict and analyse the Nynas crude oil refinery ‘s chief procedures and particularly the Hydrotreatment sub-process. The primary purpose is to suggest suited Cleaner Production steps in order to happen a more sustainable solution.

The information for this study was acquired from the Environmental Manager for the refinery every bit good as through a literature reappraisal. A survey visit of the existent refinery has besides been an interesting manner to larn more about refinery industry and Nynas specific procedures.

This study has been therefore focused on an environmental critical procedure: The hydro-desulphurization. The consequences show that the production works focuses on terminal of pipe intervention schemes and natural stuff choice techniques to cut down its waste watercourse. It is concluded that the production works has done a batch to cut down their waste watercourses nevertheless the primary inefficiencies are now largely due to dated and retrofitted equipment.



1.1 Background – The industry and Cleaner Production

In the early 1800s the chief business in Sweden was agribusiness and the most of import procedures linked to farming was seeding, reaping and pull offing animate beings. During this period it was rather clear for the husbandmans what the input and end product of their procedures were and it was likely non that difficult to command these procedures and the local environmental impact. The chief issue was the conditions and the chief resource was manpower. The morning of industrial engineering brought the industrial revolution. It became clear that new companies were non merely impacting the local environment but besides much larger countries via waterways and air watercourses. The sum of waste has, in general, increased every twelvemonth in line with economic growing and so increasingly going a bigger issue.

It is clear that human existences are holding an impact on the planet Earth that is non sustainable and will endanger our hereafter. The construct of Cleaner Production is going more and more established as a manner of developing the industry and its procedures for a more sustainable solution. There are a assortment of schemes involved in doing this a success. Waste from one company can be seen as a resource for another company and the cooperation between them build on close relationships with a construction that can be seen as bunch. There is a demand to shut the stuff loops to cut down waste watercourses every bit good as preserve resources. If this system is powered via a sustainable energy beginning so there is the possible for sustainable growing.

Purposes and aims of the study

The initial purpose of this study is to depict and analyse the Nynas crude oil refinery ‘s chief procedures and particularly the Hydrotreatment sub-process. The primary purpose is to suggest suited Cleaner Production steps in order to happen a more sustainable solution.

The aims in the first portion of the study:

Describe crude oil refinery industry including possible and existent environmental jobs for this industry such as emanations to air/water, waste and health/accident hazards.

Illustrate Nynas chief procedures in a clear and concise flow sheet.

Describe the input and end product of the chief procedures and cipher mass/energy balances.

The aims in the 2nd portion of the study:

Describe and analyse the Hydrotreatment sub-process.

Describe and analyze influent and wastewater flows for chief procedures and sub-process.

Investigate how it is possible to better the studied procedures to minimise the environmental impact utilizing Cleaner Production steps.


The information used in this study comes chiefly from class literature used in the class Cleaner Production ( MJ2640 ) at KTH. Other beginnings of information are cyberspace and in peculiar Nynas functionary web page. A survey visit was made to Nynas site in Nynashamn, South of Stockholm, in February 8th. The intent was to be able to inquire inquiries sing their chief procedures and besides to analyze the Hydrotreatment sub-process in more item.

Boundary lines

The boundary lines for this survey are set at the mill gates chiefly ; therefore the survey will include all internal procedures every bit good as onsite terminal of pipe solutions. Secondary to this the merchandises themselves will be briefly discussed every bit good as the industry in general.


Cleaner Production

Cleaner Production in a wide sense is a construct that aspires to optimize the production procedure to cut down the waste watercourse per unit of production. The methodological analysis chiefly looks to reorganize internal production processes via cleaner engineering but besides any onsite waste intervention processes. Waste streams can take several signifiers, the most obvious of which are the waste in H2O, air and landfill. However Cleaner Production techniques besides take in to account H2O, stuff and energy usage. There are several methodological analysiss that help measure production as the primary phase towards implementing Cleaner Production techniques.

The UNEP and UNIDO methodological analysiss for Cleaner Production appraisal follow a criterion format which comprises ; planning and administration, pre-assessment, assessment, feasibleness, execution followed by cyclical re-assessment every bit good as a consequence appraisal. These phases are usage instigated harmonizing to the production company in inquiry and the ends and committednesss put in topographic point by the determination shapers. It is of import to be able to measure environmental public presentation to set up it as a procedure. Cleaner Production techniques utilises an environmental index system for this. ( Nilsson, et al. , 2007 )

Schemes exist for cut downing assorted waste streams whether it is H2O, air or landfill. The abetment of such schemes is mostly dependent on production procedure and the ability of a company. Cleaner Production methods are used to cut down waste watercourses and include alterations in natural stuffs, alterations in procedure engineering and altering the system. The feasibleness of these methods is dependent on the waste type and the procedure in topographic point. ( Nilsson, et al. , 2007 )

The Petroleum Refinery Industry

In a crude oil refinery petroleum oil is processed and refined into more utile merchandises like gasolene, Diesel, asphalt, heating oil or kerosine. Crude oil is separated into fractions via the procedure fractional distillment. The fractions at the top of the fractionating column have lower boiling points than the fractions at the underside. The heavy underside fractions are frequently cracked, by the usage of accelerators, into lighter more utile merchandises. All of the fractions are processed further in other polishing units. Raw or unrefined petroleum oil is non by and large utile. Alternatively, 100s of different hydrocarbon molecules in rough oil are separated in a refinery into constituents which can be used as fuels, lubricators, and as feedstock in petrochemical procedures that industry merchandises such as plastics, detergents, dissolvers, elastomers and fibres such as nylon and polyesters and asphalt based merchandises in the building sector.


Asphalt which is besides known as Bitumen is a gluey, black and extremely syrupy liquid or semi-solid that is separated from the underside of the fractional process column due its low volatility and heavy weight. It is besides found in some natural sedimentations every bit good. It is most normally modeled as a colloid with asphaltenes as the spread stage and maltenes. ( Lesueur, 2008 ) The primary usage of asphalt is in route building, where it is used as gum or binder for the aggregative atoms. The route come uping stuff is normally called asphaltic concrete or asphalt.

Naphthenic Oil

In contrast to Bitumen, Naphthenic oils are taken out at higher points of the distillment tower because of the comparative high volatility of naphthenic compounds. They are by and large free from wax and therefore flow at really low temperatures. Because of this belongings Naphthenic oils are required for many applications in different industries. ( Ohlsson, 2010 )

General Safety and Environmental Concerns

The refinement procedure releases legion different chemicals into the ambiance ; accordingly, there are significant air pollution emanations and a noteworthy olfactory property usually accompanies the presence of a refinery. Aside from air pollution impacts there are besides wastewater concerns, hazards of industrial accidents such as fire and detonation and noise wellness effects due to industrial noise.

The populace in many states now demand that authoritiess place limitations on contaminations that refineries release and most refineries have installed the equipment needed to follow with the demands of the pertinent environmental protection regulative bureaus. Environmental and safety concerns mean that oil refineries are sometimes located some distance off from major urban countries. In Europe has the debut of European Union Emission Trading System ( EU ETS ) have made a important impact on the emanations from oil refineries in the continents. ( Holmgren & A ; Sternhufvud, 2006 ) However, there are many cases where refinery operations are close to populated countries and pose wellness hazards.

Nynas AB in Brief

Nynas AB has its central offices in Stockholm and approximately 800 employees. The company has operations in five continents but chiefly in Western Europe. Nynas is owned by Neste Oil Corporation ( Finland ) and Petroleos de Venezuela SAS ( Venezuela ) .

Key figures

An overview of the company key figures shows that the company is turning as the gross revenues is increasing over the old ages, see Table and Figure 2.1.

Table 2.1 Nynas fiscal consequences ( Nynas web page )

Figure 2.1 Net Gross saless in SEK million ( Nynas web page )

Nynas Merchandises

Nynas industries three chief merchandises ; Naphthenics forte oils, which is any of several Cycloalkane Hydrocarbons holding the general expression C2H2n and found in assorted crude oil ‘s. ( Houghton-Miflin, 2000 ) The others are Bitumen and Specialty fuels, Figure 2.2.

Figure 2.2 Gross saless by Merchandises ( Nynas web page )

Environmental policy

Harmonizing to Nynas web page has the company HSSE & A ; Q ( Health, Safety, Security, Environment and Quality ) an purpose to run a concern that they can be proud of and gain trust from its stakeholders for a long tally sustainable solution.

Management system

Nynas is accredited in run intoing the demands of ISO 9001 and ISO 14001. ISO 9001 is a standard which focal point on quality direction patterns. It gives guidelines and standardised demands for quality direction system, vocabulary, public presentation betterments, certifications, preparation and fiscal and economic facets. ISO 14001 is a direction tool enabling an organisation of any size or type to place and command the environmental impact of its activities, merchandises or services. Another of import point is to work for continually improved environmental public presentation and besides implement a systematic attack to puting environmental aims and marks, to accomplishing these and to showing that they have been achieved harmonizing to ISO web page.

The Environmental Manager at Nynas went through their environmental policy. Their chief scheme includes holding an unfastened duologue with the Environmental Protection Agency ( EPA ) of Sweden. There are programs to replace substructure of the works to do it more efficient and at present clip a killing of a Brownfield within the mill Gatess that is a consequence of operations pre terminal of pipe intervention schemes. This site will be used for a new province of the art production works that will profit from the most efficient terminal of pipe procedures. The company will go on to maintain public presentation within stated guidelines and will supervise emanations utilizing the ISO criterions. Emissions nevertheless are set to increase in the hereafter with a planned increased production. There are besides programs to replace the chief fuel that drives the procedures within the refinery with Liquid Petroleum Gas ( LPG ) . This scheme will cut down CO2 emanations well. ( Ohlsson, 2010 )

Nynas AB Refinery Processes

Oil refineries convert rough oil into crude oil merchandises via many sub-processes. Industrial procedures have been developed to let a scope of merchandises to be sourced from rough oil, for illustration green goods fuel, heating oil or asphalt base. These procedures differ depending on the constituent and the pureness of the merchandise wanted. An of import general phase of oil refinement is the distillment procedure which is used to divide different sort of chemical elements. The rule of the distillment procedure is shown in Figure 2.3.C: UsersEd and SofiaDesktopdistillation2.jpg

Figure 2.3 Distillation Principles ( Al-Muslim, Dincer & A ; Zubair, 2004 )

Oil-refining procedures are extremely energy-intensive and about 7 % to 16 % of energy equivalent of rough oil processed is used in refinement procedure itself. This makes the procedure of polishing fossil-fuels more polluting. ( Szklo, 2007 ) The increased force per unit area from governments and market has given an inducement to oil refineries to optimise their procedures and lower the sum of Sulphur, Nitrogen and other chemicals in waste watercourses and in the concluding merchandise. They besides need to travel towards cleaner and more energy efficient production procedures.

Energy usage

Oil refinement is complicated chemical process. It includes several phases and sub-process depending on the sort of merchandise. A survey carried out by Energetics ( 1998 ) kind oil refinement procedure by energy usage, consequences are given in Table 2.2. Heat and electricity are used by refineries to big extent. Heat is frequently produced in the refinery, by utilizing fuel coming from procedure wastes and from primary energy beginning boilers.

Table 2.2 Energy Used by Polishing Process Unit ( MJ/b ) ( Energetics, 1998 )

Nynas Main Processes

This is a simplified schematic of the chief procedures within the Nynashamn production works.


POR = Partial Oxidation Reactor

VDC = Vacuum Distillation Column

FBR = Fixed Bed Reactor

SRR = Sulphur Recovery Reactor

Figure 2.4 Nynas Main Processes ( Ohlsson, 2010 )

At Nynas, rough oil is delivered to the site and straight sent to the belowground stone caverns ( belowground storage ) . From there it is sent for fractional process inside vacuity distillment columns. While dividing Bitumens from the Venezuelan rough oil at the underside of one distillment column staying light hydrocarbons are removed from the top. It is so sent into the Fixed Bed Reactor ( FBR ) where it is subjected to catalytic reaction with H under high force per unit area to bring forth Naphthenic oils. The rancid gas, coming out from the FBR unit, is comprised of different compounds like H sulfide and other hydrocarbons. Therefore it is sent into the Sulphur Recovery Reactor ( SRR ) in order to take the sulfur prior let go ofing into the ambiance, see Figure 2.4.

Nynas Hydrotreatment Sub-process

Hydrodesulphurisation procedure is the chief procedure involved in the production of Naphthenics.


FBR = Fixed Bed Reactor

GS = Gas Separator

CR = Clause Reactor

Figure 2.5 Nynas Hydrotreatment Sub-process ( Ohlsson, 2010 )

In the Fixed Bed Reactor, Co and Pt are used as the fixed bed accelerators for the reaction. Hydrogen gas compressed up to 130 bars is responding with light hydrocarbons in order to bring forth Naphthenic oils. The produced Naphthenics are so sent into a gas centrifuge where it further removes gases. The liquid is so sent into a denudation column where the pure Naphthenics ( non contaminated with sulfur ) are produced. The rancid gases generated at each phase ; FBR, Gas Separator ( GS ) and Stripper are sent into a reactor vas where solid sulfur is removed harmonizing to the clause procedure. At this concluding clause reactor SOX and NOX together with H2O vapors are produced and therefore released into the ambiance in the fumes gas, see Figure 2.5.

Nynas Desulphurization Process

Desulfurization is besides called Flue Gas Desulfurization ( FGD ) and is a technique used in industrial applications breathing fluke gas. Flue gas refers to emanation in the combustion of fossil fuels such as oil. Even if most of these gases are CO2 and N2, oil refinery faces the issue of extremely risky gas such as NOx and SOx, particularly Sulphur Dioxide ( SO2 ) . The latter is good known for its critical function in the development of acid rains. Transported over long distance, what is frequently seen as an outwardness causes terrible harm to the environment such as works damaging, acidification of dirts or deformation of Nitrogen rhythm. ( Hordijk, 1997 )

It is in this context that desulphurization techniques have been developed. The end is to catch gaseous sulfur oxides, precipitate sulfurs so as to avoid the emanation of SO2 in the air. In most instance, Sulphur is trapped and turned into a solid crystal such as Calcium Sulphite ( CaSO3 ) . Three chief methods used:

Wet scrubbers

Dry scrubbers

Dry spray

Wet Scrubber

Nynas AB uses in its Nynashamn refinery the wet scrubber method. This method is the most efficient, even if besides the most expensive. ( EPA, 1997 ) After a first phase in which the fluke gas is saturated in H2O, the sorbent absorbs SO2. Figure 2.6 shows standard absorber tower.

Figure 2.6 Absorber Tower ( Cline, 1998 )

The consequence of this phase is calcium sulphite thanks to the chemical reaction in equation ( 1 ) . Sorbent used at Nynas every bit good as in many FGD installations is limestone ( CaCO3 ) , a sedimentary stone available at rather low monetary value.

CaCO3 + SO2 CaSO3 + CO2 ( 1 )

Calcium Sulphite still needs to be oxidized into Calcium Sulphate ( CaSO4 ) which is used to bring forth gypsum. The latter is a mineral used in several applications such as chalk or plaster and its merchandising is a manner to counterbalance the immense FDG installation investing. Nynas disposes one FDG installation at the minute. It is used to desulphurize flue gas from the three Hydrotreatment units. These units must be run at the same clip as the FDG otherwise is SO2 released. It induces terrible restraints from an organisation point of position, so Nynas has programs to construct another FDG unit to do the Hydrotreatment more flexible.

Nynas Mass and Energy Balance

Both mass and energy balance computations are of import to be able to understand procedures and costs for a production site. Particularly the increasing cost for energy has made this computation interesting harmonizing to the web page of National Productivity Council of India. To cipher entire energy balance for a system it is of import to understand energy input of the system such as usage of electricity every bit good as step end product in the merchandises go forthing the mill but besides possible waste, e.g. heat losingss. Mass balance equation is ( 2 ) and energy balance computation is ( 3 ) . To acquire an overview of Nynas mass and energy balance see Figure 2.7.

Natural Materials = Products + Waste + Stored Materials ( 2 )

Energy Entering = Energy Leaving with Products + Energy Leaving with Waste Materials + Energy Lost to Surroundings + Energy Stored ( 3 )

Nynas Production Site

Raw Material

Crude Oil, 940 061 dozenss

Chemicals, 485 dozenss

Water 11.6 million M3

Energy Entering

Fuel ( Oil & A ; Gas ) , 20 517 dozenss

Electricity, 58 144 MWh


Naphthenic, 377A 234 dozenss

Bitumens, 527A 602 dozenss

Energy Leaving with Merchandises


Dangerous waste, 3720 dozenss

Other waste, 424 dozenss

Energy Lost to Surround

Oil ( Hydrocarbons ) , 3.4 dozenss ( Water )

Energy Leaving with Waste Mtrl

Waste Oils, 2 700 dozenss

Air Emissions

SO2, 252 tons/NOX, 85 dozenss

CO2, 158A 000 dozenss

Hydrocarbons VOC, 435 dozenss

Stored Materials

Energy Stored

Figure 2.7 Nynas Mass & A ; Energy Balance ( Miljorapport & A ; Environmental Statement, 2008 )

Nynas Refinery and Cleaner Production

The Nynashamn oil refinery as described above has several procedures within its production of its two primary merchandises Bitumen and Naphthenic oils. Its Naphthenics are extremely specialised and a really pure distillation. Due to the nature of this merchandise the procedure of refinement is peculiarly demanding. The procedure requires a hydrodesulphurization technique to acquire the pureness required temperatures are elevated to 400oC and force per unit area is elevated to about 130 saloon, a accelerator of Co and Mo is besides used in the procedure. ( Ohlsson, 2010 ) There are several phases in the overall production that could be changed or have been changed in order to accomplish a degree of Cleaner Production.

Natural Materials

The natural stuffs are the first consideration. The content of the natural stuffs is important because constituents will either stop up in the merchandise or in the waste watercourse. There are a assortment of stuffs that goes into the production processes. These comprise several classs:

Crude oil, which is the natural stuff for the merchandise.

Combustion stuffs, for bring forthing heat for subsequent high force per unit area steam, LPG fuel for powering the H production.

Catalysts, such as Co and Mo.

Nynashamn has selected its natural stuffs to cut down its waste watercourses. The rough oil is selected because of its physical constituents ensuing in a waste of less than 1 % most of which is H2O based. The really little sums of oil constituents come ining the waste H2O are reduced by 99 % by onsite waste H2O intervention. Fuel for powering the works is sourced externally and is selected for its low sulfur content. ( Ohlsson, 2010 )

Production Procedures

The procedure itself is complex in that it has to be really precise to bring forth the high quality merchandises wanted therefore it is hard to optimize the procedure, several factors could be considered. However, efficient force per unit area coevals and thermic conductivity are cardinal as these are the most energy intensive facets of production. Some of the equipment is old and perchance non every bit efficient as it could be. For illustration the H manufacturers are over 25 old ages old. Therefore this is a possibility for efficiency betterments. There is besides the demand for a sulfate remotion engine within the works as there are dependability jobs within the procedure, ensuing in mass release of sulfur dioxide on the dislocation of the machine. Procedures are controlled at a cardinal control station at Nynashamn works every bit good as holding about 180 forces commanding the procedures manually. One of the issues that cause an increased release of sulfur dioxide is the handiness of merely one desulphurisation unit.

End of Pipe Treatment

Onsite terminal of pipe interventions are non Cleaner Production schemes in the purest sense. However, they are an of import scheme in cut downing the waste watercourses coming out of the mill. Systems in topographic point at Nynashamn include a waste H2O intervention works, scrubbers, handling flue gases, a desulphurisation unit and a heat exchange to use waste heat from the distillment and hydrodesulphurisation unit. The efficiency of the waste H2O intervention procedure can be seen in Figure 2.7 with the really little measure of oil released into the local environment. SOx and NOx emanations are besides low harmonizing to this figure and this is mostly due to the terminal of pipe solutions in topographic point.

Merchandise Design

The concluding merchandise of Naphthenic is highly refined and although this consequence in energy intensive procedures it besides increases the merchandise life and reduces taint during the merchandise usage phase. The merchandise does non bring forth CO2 during its usage stage. ( Nynas AB, 2010 )

The concluding production of Bitumen is less refined ; nevertheless the merchandise has a long merchandise life and is immune to debasement in the environment. The merchandise does nevertheless supply the substructure for route conveyance which is a extremely fossil fuel intensive manner of conveyance.


Cleaner Production Methods in Place

Natural Materials

Nynas produces two chief merchandises Bitumen and Naphthenic forte oils. Alternatively of utilizing distillment from a individual type of natural stuff, they chose to utilize specific petroleum oil for both of these merchandises. Venezuelan oil is extremely concentrated in heavy bitumen and North Sea oil is of high quality, with a low concentration of sulfur. This is a great scheme in cut downing terminal of pipe costs and cut downing production costs. There is besides selectivity in fuels that power the works. However, any intervention processes that contribute to the quality of the fuel are non accounted for in the waste watercourse of Nynashamn. Therefore it may be an exercising in traveling the job.

Reduces intervention phases and waste watercourses. No demand to utilize excessively much dissolver to pin down and take unwanted chemicals. It besides implies less phases, and lower energy ingestion. Furthermore, there is much less waste, i.e. parts of the oil that are non in the concluding merchandise.

Important function in merchandise environmental quality. Low sulphur degree gives less risky merchandises if burnt or released in environment. The physical features and life length of the concluding merchandise are besides closely related to raw material quality.

The sustainability of such a high quality stuff is questionable. However, particularly as planetary oil resources are depleted. This may intend in the hereafter that lower quality oils may hold to be utilised with the consequence of an increased waste watercourse.

Merchandise Design

The merchandise design in this instance is chiefly orientated around the usage stage. In the instance of Naphthenics the pureness of the oil has an consequence on the usage stage of the merchandise.

Corrosion additives are non needed and it will be no corrosion due to pureness of merchandise. This means that the usage stage of the merchandise has less impact through corrosion and potentially detrimental additives are non necessary.

Long-life. Nynas decided to concentrate on quality instead than measure. By taking to sell extremely specialised and high quality merchandises, it does non take portion in increasing over ingestion. That manner, cut downing the production, oil flow, energy usage is reduced maintaining the functionality unchanged.

Equipment Design

New LPG burners will give VOC and CO2 emanation decreases. At the minute, the heat production uses oil furnace, which releases a high volume of CO2 and VOC. Nynas plans to replace this furnace with LPG burners. LPG fuels perform better every bit far as VOC and CO2 emanations are concerned.

The installing of a new desulphurization unit is of import. At the minute, one individual desulphurization installation is running together with Nynas ‘ three hydrotreatment units. It makes it impossible to utilize a individual hydrotreatment unit without turning on the extremely energy intensive desulphurization unit. A new desulphurization installation will better the mill flexible and besides improved environmental public presentation thanks to new desulphurization engineering.

Larger more efficient production unit. Optimized development, province of the art engineering.

Routines and Management

ISO 14001 is in topographic point and this system can be successful in supervising all environmental variables supplying the model for improved public presentation. However ISO14001 is general and does non per se necessitate companies to run into any specific marks, therefore it is of import for the company to hold their ain betterment aspiration.

Open duologue with stakeholders chiefly the Swedish environmental governments. This transparence duologue could move as a drive force for betterment in concurrence with the EMS. This system may get the better of the job with a non mark orientated ISO system.

End of Pipe

End of pipe solutions are non to the full incorporate solutions. However, the terminal of pipe solutions within the works is an of import portion of the solution. It is of import to minimise the demand for these solutions or do them more efficient through other incorporate solutions as they are non to the full efficient under certain conditions and they are expensive to run and keep.

Waste H2O intervention is updated and made more efficient with a concentrated low volume waste watercourses, this is straight affected by the natural stuff used every bit good as the efficiency of the production procedure.

Desulfurization is an expensive and complicated process it is necessary measure following the hydrodesulphurisation of the distillment merchandise. Hydrodesulphurisation allows an oil to hold more length of service and cause less environmental debasement during its life span.

Scrubbers for NOx and SOx emanations are reasonably standard terminal of pipe attacks and can be more efficient if the waste watercourse is one time once more more concentrated and of lower volume.

Recycling heat waste via heat exchange. This scheme reduces environmental harm from heat and excess heat is sold to the community. This procedure makes sense. However, it has deductions of locking the country into a fossil fuel dependent system and may ensue in less locally produced heat in the community.

Suggested Improvements


The production works has been in topographic point for a really long clip and has been capable to retrofitting, this means that the current equipment may non be every bit efficient as it could be. Redesigning grapevines to minimise length would be an option.A Pipe length is a concern with retrofitting some of the benefits of a more direct system are detailed below:

Reduced heat loss, due to decrease of surface country and low abode clip.

Hazards reduced, due to lower opportunity of jeopardy because of easy supervising and preventative care.

Pumping energy, is reduced due to lowered clash in shorter pipes.

Flexible pumps could be a possible betterment to cut down energy loss when regulation flows.

Regulating flows by barricading pipes puts the system under unneeded strain every bit good as change overing pumping energy into heat at the valve.

Reconsidering the compressor set up. Investigating for modern compressors with higher efficiencies will necessitate far less figure of compressors in operation to bring forth 130 saloon. Compressors are some of the most energy inefficient equipment in industry. Therefore salvaging on them would take to important accomplishments in energy decrease.

Install looking spectacless for supervising of the furnace instead than an gap door which creates batch of infiltration and hence important heat loss.


One of the clear energy losingss in the system is the combustion of extra H a procedure called flaring this is an energy loss that could be limited by direction and optimization of the H workss. So merely the right sum of H was produced and possibly the balance could be stored leting for losingss merely when there is extra force per unit area.

Performance an LCA of equipment to find cost effectual efficiency based equipment ascents could be an of import justification of betterments that reflect an economic and environmental benefit.


Potential for utilizing the fluke gas ( exhaust gas ) A of boilers and furnaces to supply heat for the chief fractional process procedure. Alternatively the energy could be used for pre warming of propane used for combustion.

Condensate aggregation from force per unit area release valves in the system. Effective aggregation of this condensate and utilizing it for the pre warming of provender H2O for boilers would avoid the important energy loss at this point.

The fumess form boilers and furnaces and fractional process columns could be used as beginnings for heating the premises during the winter.

End of Pipe

To better the production VOC-capture and burning could be utilized. This terminal of pipe solution could potentially cover with the big flows of VOC that are shown in Figure 2.7. However, a high concentration is required for efficient remotion and with the big volumes of flue gases this promotes a job and cost effectual VOC remotion may non be possible due to the nature of the procedure.

Figure 2.7 shows ‘dangerous waste ‘ as a really big emanation, this would hold been a focal point of the cleaner production solutions in this study nevertheless this waste is non attributed to normal operations. This waste is due to redress of the site from a period in production when waste direction demands were non as stringent and schemes did non include terminal of pipe procedures. The waste was land filled on site ensuing in a big brown field. The measures of unsafe waste coming out of the site are hence due to the decontamination of this brown field site.

CO2 emanations at the site are important and largely attributed to heat and electricity production. With present engineering the best scheme for cut downing this emanation is to cut down energy ingestion and usage low CO2 fuels such as LPG. In the hereafter nevertheless CO2 emanations from the works potentially could be stored utilizing C gaining control technologies this is a possible transitional solution until renewable energy substructure has been developed.


This study highlights the chief procedures involved in the oil refinery industry, particularly sing its impact on the environment. This industry is a important subscriber to green house emanations. These are non merely attributed to the production stage but in the instance of most refinery merchandises to the usage stage every bit good. Refined oil is frequently used in conveyance and energy production. The production itself has been found to be energy intensive and includes emanations of many fouling gases, such as CO2, SOx and NOx.

Nynas ‘s production works in Nynashamn was chosen as the focal point of this study. The merchandises of this works are Naphthenic forte oils and Bitumen. In this regard, Nynas is non precisely representative of the mean oil refinery, but alternatively it represents a niche market. Thankss to certification work, visit to the works and treatment with a Nynas Environmental Manager, it has been possible to account for the energy and waste flow. It was found that the hydro-desulphurization procedure has the most important environmental impact at Nynas refinery.

Nynas is environmentally cognizant and has implement betterments in its procedures, stuffs use and has attempted to cut down energy wastage. The organisation is really much focused on environmental direction, all units are to the full ISO 14001 certified and the Environmental Manager seems to be engaged in a crystalline duologue with governments. The concern scheme of the house leads it to bring forth high quality merchandises which cut down the demand of additives and lengthen their life anticipation this scheme besides shows an consciousness of usage stage impacts.

There is the possible with present engineerings to better Nynas ‘s environmental public presentation. There are several local ascents which could better the planetary efficiency of the refinery. For case, it appears that utilizing more flexible pumps and shorter pipe length should let important energy nest eggs. Heat could besides be re-used at many phases in the works, such as boilers and flue gas. Green house gases and particularly VOC emanations are one issue that most demands to be improved on. VOC gaining control combined with a more holistic attack ( such as Life Cycle Assessment ) to implement local betterments may be a good manner to do Nynas cleansing agent.

Cleaner Production betterments are non likely to be finite as engineering is continually developing. Nynas needs to look to the hereafter, by bettering and implementing new engineerings, every bit good foretelling new developments in the industry. Nynas will necessitate to take a really proactive attack if they are to run into an of all time increasing outlook of environmental public presentation.