榆林金属镁行业大气污染现状调查及减排建议

2017年榆林金属镁产能达到86万t,约占当年全国的60%,主要分布在府谷县。金属镁行业大气污染物排放现状调查及监测数据表明,各生产工段大气污染物达标排放,大部分排放浓度低于现有限值,金属镁企业在线氧含量在9%~16%,且各企业间差异较大,企业现状基准过量空气系数在4.2左右,为现有标准的2.5倍,导致折算后污染物浓度有超标可能。2017年榆林金属镁行业SO₂、NO_x排放总量全市排名为第八、第三,榆林市金属镁行业SO₂、NO_x排放总量占比靠前,治理技术经济可行条件下可考虑深度减排。分析了榆林金属镁行业大气污染治理现状及存在问题,提出除尘、脱硫、脱硝技术改造建议,指出金属镁行业深度治理减排方向,可为地方金属镁行业标准制定提供基础数据。

Current Status of Air Pollutant Emission and Suggestions on Emission Reduction of Magnesium Industry in Yulin

In 2017, magnesium production capacity in Yulin is 860 kt, accounts for about 60% of China, and mainly distribute in Fugu county. Air pollutant emission status of magnesium industry survey and monitoring data show that pollutant emission in each production section achieves standard. However, the online oxygen content of enterprises is 9%-16%, and there is a big difference among enterprises. The excess air coefficient of magnesium enterprises is about 4.2, which is 2.5 times of current standard. As a result, pollutant concentration becomes larger after conversion, which may exceed the standard. In 2017, total SO2 and NOx emissions of magnesium industry in Yulin rank the eighth and third in Yulin city, indicating that magnesium industry has emissions reduction quantity. Current situation and existing problems of air pollution control in Yulin magnesium industry are analyzed. Suggestions on technical transformation of dust removal, desulfurization and denitration are put forward. The direction for depth management of magnesium industry is pointed out. Standard establishment of local magnesium industry is promoted.