Flue-gas Treatment Technology Evaluation For Waste Incineration Plant Based On Life Cycle Analysis

Current assessment evaluation for the incineration plant flue gas system is basedon the emission factors for the gas emission value, which has only consider the fluegas cleaning system. This evaluation process has not consider the comprehensiveenvironmental assessment impact based on the raw material, resources and the energyconsumptions. According to this, this study has use life cycle assessmentmethodology to evaluate different flue gas treatment process, which can be thereference for the waste to energy plant to choice the flue gas cleaning technology.This article analyze the real incineration plant in Changzhou, which has been usethree flue gas cleaning technologies(spray dry reactor+active carbon+filter bag;spray dry absorber+dry reactor+active carbon+filter bag; SNCR+spray dryabsorber+dry reactor+active carbon+filter bag) in different stages by the life cycleassessment. This three technologies has been evaluated to conclude the differentenvironmental impact by using six different factors: acidification potential, primaryenergy demand, global warming potential, eutrophication potential, abiotic potentialand respiratory inorganic, which is based on the ECER index according toenergy-saving and emission-reduction regulation in China. The estimation for theenvironmental impact is based on the most significant emission factors in China in2010as well as the consumptions in order to find out the most significant technologyand the subordinate one by contribution analysis and sensitivity analysis. Thisassessment evaluation has obtain an integrated result based on the technology and theeconomic index.The study shows three results:(1) for all the three flue gas cleaning processes,acidification potential and respiratory inorganic identically contribute to theenvironmental impact; primary energy demand and abiotic potential are thesignificant factors which contributes to the environmental impact, but with theminimum effect of spray dry absorber+dry reactor+filter bag process; for the globalwarming potential, the significant process will be SNCR+spray dry absorber+dryreactor+filter bag process, the other two process contribute equivalent to theenvironmental effect. for the eutrophication potential, SNCR+spray dry absorber+dry reactor+filter bag process is the minimum factor which contribute the result; byusing ECER as method to evaluate the process, spray dry absorber+dry reactor+filter bag process has the minimum effect, which has the most significant factor ofprimary energy demand, SO2and NOx.(2) primary energy demand is the mostsignificant factor for evaluate the flue gas cleaning process;(3) flue gas cleaning onsite, industrial water, industrial compress air and calcium hydroxide is the mostimportant factor for environmental assessment evaluation, which should be thesignificant process of flue gas cleaning system modification.(4) the primaryrecommendation will be spray dry absorber+dry reactor+filter bag process.