煤化工行业氮氧化物排放系数研究

通过现场监测和模拟燃烧实验的方法,分别对陕西某煤化工企业中的甲醇、二甲醚、合成氨和尿素工艺过程中的氮氧化物进行监测,并初步核算各煤化工行业氮氧化物的排放系数.结果显示,不同煤化工行业中,煤炭在作为原料利用时氮氧化物排放量不尽相同,其中甲醇行业氮氧化物排放量为153.19~252.43g/h,平均为211.24g/h;二甲醚行业氮氧化物排放量为22.38~52.20g/h,平均为35.39g/h;合成氨行业为246.48~359.65g/h,平均305.94g/h;尿素行业为13.70~26.75g/h,平均19.89g/h.不同行业氮氧化物的排放系数也有所差别,按照单位产品排放量核算时,各行业氮氧化物的排放系数分别为甲醇41.35~88.10g/t-产品、二甲醚62.27~145.25g/t-产品、合成氨213.47~322.43g/t-产品、尿素0.21~0.41g/t-产品,以单位原料煤消耗量核算出的氮氧化物排放系数分别是甲醇30.18~52.86g/t-原料煤、二甲醚22.83~53.26g/t-原料煤、合成氨119.72~172.73g/t-原料煤、尿素为0.14~0.28g/t-原料煤.通过比较可知,煤在作为原料利用时其氮氧化物的排放系数远小于煤的燃烧过程.

Nitrogen oxides emission coefficient of coal chemical industry

Nitrogen oxide emissions from the processing of methanol, dimethyl ether, synthetic ammonia and urea production were monitored in a certain coal chemical factory in Shaanxi province, and the nitrogen oxide emission coefficients were calculated based on the results of both monitoring and combustion experiments. It was shown that Nitrogen oxide emissions ranged from the different coal chemical production industries. The NOx discharge amounts of methanol, dimethyl ether, synthetic ammonia and urea industries were separately between 153.19 and 252.43g/h (AV: 211.24g/h), 22.38and 52.20g/h (AV:35.39g/h), 246.48and 356.65g/h (305.94g/h), 13.70and 26.75g/h (19.89g/h). Per capita production NOx emission coefficients in different industries also varied, which were 41.33~88.10g/t (methanol), 62.27~145.25g/t (synthetic ammonia), 213.47~322.43g/t (synthetic ammonia), 0.21~0.41g/t (urea). Per capita coal consumption as raw material NOx emission coefficients were respectively 30.18~52.86g/t (methanol), 22.83~53.26g/t (synthetic ammonia), 119.72~172.73g/t (synthetic ammonia), 0.14~0.28g/t (urea). Compared with two group data, NOx emission coefficients with coal as raw material were much less than those from coal combustion process.