Source Category And Emissions Accounting Of Volatile Organic Compounds From Coal To Olefin Enterprises

Volatile Organic Compounds?VOCs?are main contributions to ambient PM_2.5.5 and O₃ in atmosphere.Most of VOCs are toxic and deleterious matters which have adverse effect in human health.Coal to olefin industry produces clouds of VOCs emissions.Therefore,Calculation on VOCs emissions and analysis of emission characteristics are essential to air pollution control policy making and implementation in China.VOCs emission sources were analyzed and divided into 12 parts on the basis of the way and condition of discharging,including seals,tanks,wastewater collection and treatment system,organized process emission,fugitive process emission,organic liquid loading and unloading,circulating water system,fuel combustion,flare,abnormal situation,accidental discharge and coal storage.Emissions accounting methodology was proposed by concluding VOCs quantitative methods and performing experimental simulation.VOCs emissions from a coal to olefin enterprise was accounted using the most compatible methods.The result showed total VOCs emissions was 1711.27 t/a.Sources in the descending order of emissions were circulating water system 448.66 t/a,wastewater collection and treatment system 430.96 t/a,seals 421.06 t/a,tanks 200.99 t/a,fuel combustion 84.02 t/a,organized process emission 47.47 t/a,coal storage 35.93 t/a,flare 35.73 t/a,organic liquid loading and unloading 6.45 t/a.Critical factors associated with sources emissions were chosen in terms of accounting methods.Mechanism of and impact on emissions of all factors were conducted.VOCs control measures of coal to olefin enterprises were put forward according to following principles,source prevention,process control and end-treatment.