Study On Characteristics Of Pollutants Emission From Non-road Mobile Source And Biomass Boilers On Real Work Conditions

City clusters in China have been experincing severel regional air pollutions for many years,with the shrink of emission reduction potentials on major sources?e.g.,vehicle and industrial sector?,emissions from non-road mobile sources and biomass boilers have become more and more important.In-land ships and construction equipment were the main source of NO_X and SO₂ in non-road source category,of which emissions posing important impacts on human health and air quality.Meanwhile,emissions from biomass boilers contains varies pollutants include VOCs,which may cause serious air pollution problems.But the insufficient understanding of emission characteristics strangled detailed environment management.This study,aiming at non-road source category and biomass boilers,not only obtained the emission factors,but also identified the VOCs and PM_2.5 source profiles by using on-board emission tests.The results of this study as follows:?1?The emission factors in ships of CO,NO,NO₂,NO_X and SO₂ were 6.8 g/kg?-40%,47%?,35.2 g/kg?-11%,11%?,5.5 g/kg?-21%,21%?,40.7 g/kg?-11%,11%?and 1.4 g/kg?-90%,197%?respectively.The emission factors in construction equipment of CO,NO,NO₂,NO_X and SO₂ were 17.7 g/kgF?-43%,53%?,37.8g/kgF?-41%,38%?,9.9 g/kgF?-41%,41%?,and 47.7 g/kgF?-41%,38%?and 0.5 g/kgF?-100%,111%?respectively.The emission factors in biomass boilers of CO,NO,NO_X and SO₂ were 8139 g/h,1475 g/h,2265 g/h and 84 g/h.?2?The main compound from non-road source exhaust is OVOCs,and the most abundant species were formaldehyde,acetaldehyde,propylene and ethylene,and the emission of formaldehyde and acetaldehyde was worthy of attention.The main compound from biomass block boiler were OVOCs and aromatic hydrocarbons,while the main compound from wood biomass boiler was alkyne.?3?The emission factors in ships and construction equipment of PM_2.5 were 2.4 g/kgF and2.6 g/kgF.The total carbon was the dominant component in the exhaust PM_2.5.5 from ships and construction equipment.For ships and construction equipment,their ratios of organic carbon to elemental carbon were 1.2 and 3.0 respectively,and NO₃^-,PO₄^3-and Na⁺were the most important contributor to water soluble ion,moreover,Ca,Na and Mg were the main contributors in inorganic elements.For biomass boilers,the main component was water soluble ion,and the most important contributor to water soluble ion were NO₃^-,Cl^-,Na⁺and NH₄⁺,K,Ca and Al were the main contributors in inorganic elements.