| In rural North China,dispersed winter heating is one of the main sources of air pollution.In recent years,the replacement of Raw coal and traditional inferior stoves with "clean fuel and stoves" has become one of the key measures for the country to promote clean heating.To accurately assess the effectiveness of clean coal reduction,this paper builds a laboratory dilution test system and tests nine typical fuels.The PM2.5 emission factors of Anthracite Briquette,Semi-coke and Biomass wood pellet can reduce emissions by about 90.1%,80.1%and 38.7%,respectively;and there are 94.0%,87.9%and 62.6%emission reductions for Wood coal,respectively.It shows that clean fuel has good particulate emission reduction effect.In order to explore the actual emission reductions used by residents,this paper conducts field tests on clean coal,biomass pellets,and square honeycomb coal,at the same time,propose a test method and demonstrate the need for user information and fuel usage surveys for the test area,and propose the necessity of full-stage testing and daily average concentration accounting.The Anthracite Briquette's emission reductions of SO2 and PM2.5 in Raw coal are 29.1%and 77.4%,respectively,but NOx is 53.5%higher than Raw coal.Comparing with Raw coal,Biomass pellets in the water heating and roasting stoves have an PM2.5 emission reduction effect of 52.5%and 51.3%,respectively,and no SO2 is detected,but there is no NOx emission reduction effect relative to the Raw coal.When the emission factor is converted into the total amount of pollution emissions throughout the year could gain the results that blindly improving the combustion efficiency of stoves is not conducive to emission reduction;Honeycomb coal and its associated stoves are the most economical and clean heating methods.For areas with high quality biomass resources,small heating area and low indoor temperature requirements,promoting biomass roasting stoves can effectively reduce the total amount of pollutants discharged. |
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