\uc5dahl, Anders

Berntsson, Thore

Harvey, Simon

Chalmers Research

Process integration in industry for cost-effective greenhouse gas reductionAnders Ådahl,Simon Harvey & Thore BerntssonHeat & Power TechnologyChalmers, SwedenIdentification of cost-effective measure packages for industrial GHG mitigations is now possible. A method accounting for (i) complex interplay between measures for existing plants and (ii) possible GHG effects off-site has been developed.Options for GHG mitigationWithin a process plant combustion of fuel isthe main source of GHG emissions. Mitigationmeasures should thus preferably be taken inthe industrial energy system. Options are: Increased heat recovery Integration of CHP systems Heat pumping Process modifications Fuel switchingInformationQuestions are most welcome. One might perhaps wonder how a GHG emission reduction of more than 100% is possible (Fig 1.).Web: www.hpt.chalmers.seMail: anders.adahl@hpt.chalmers.seExperiencesWith the method, cost-effective significantGHG reduction options can be targeted.Combinations of measures are mostly moreattractive than single measures.Predominant factors for the GHG reductionpotential are the level of electricity gridemissions, and the current process layout.For results interpretation most crucial is tohave both a well defined system boundary anda carefully chosen emission baseline.Fig 1. Compiled results graph-200204060801000 4 000 8 000Total cost (k$/year)Relative CO2 emission (%) Oil boilerNG boilerBio boilerNG CHP (GT)Bio CHP (ST)Oil boiler + HPNG boiler + HPBio boiler + HPNG CHP (GT) + HPBio CHP (ST) + HP100% corresponds to 72370 tons/yearBase case(oil boiler)Economic optimum02 0004 0006 0008 00010 0000 20 40 60 80 100CO2 tax ($/ton)Total cost (k$/year)Base caseOil boiler + HPBio boiler + HPNG CHP (GT) + HPToday's CO2 taxationDoubled CO2 taxation-40-200204060801000 20 40 60 8Cost-effectiveness ($/ton abated CO2 emissions)Relative CO2 emissions (%) Economic optimum(Oil boiler + HP)NG CHP (GT) + HPBio boiler + HPBio CHP (ST) + HPBio CHP (ST)Fig 2. Cost-effectiveness graph Fig 3. Sensitivity analysis graphMethodThe method is described in brief and exemplified by a case study (Fig 1-3). 1.Define system boundary and baselines.2.Retrofit the heat exchanger network.3. Report cost minimized solution and GHG emission reductions at heat saving levels defined (yellow curve in Fig 1). 4. Repeat for any additional measure considered (other curves in Fig 1).5. Identify the overall cost minimized solution (point on red curve Fig 1).6. Identify cost-effective alternatives (Fig 2).7. Perform sensitivity analysis (Fig 3).Input for industrial or policy-making decision

Process integration in industry for cost-effective greenhouse gas reduction

Ådahl, Anders

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Process integration in industry for cost-effective greenhouse gas reduction

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Chalmers Research

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