The hottest steel industry welcomes the year-end e

2022-10-23
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The iron and steel industry ushered in the year-end environmental protection examination

on September 23, the station unit of the Ministry of environmental protection issued a notice for J on the strengthening of supervision over the prevention and control of air pollution in Beijing, Tianjin, Hebei and surrounding areas. The notice said that in the process of supervision, the elimination and transformation of small boilers, the integration of gas-related "scattered pollution" enterprises, which have good prospects for utilization, combined remediation, volatile organic compounds treatment, urban and rural loose coal treatment, and the failure to install pollution treatment facilities are the most prominent problems

for a long time, the iron and steel industry has been criticized as a major energy consumer and polluter. From coking, sintering, ironmaking, steelmaking to steel rolling, the whole smelting process in the iron and steel industry will produce different types of pollutants, and almost more than half of the material input is discharged in the form of waste gas, solid waste or by-products

in the process of iron and steel production, the sintering and coking links mainly produce waste gases such as sulfide, nitrogen oxide and smoke, while the ironmaking and steelmaking links mainly produce solid wastes such as slag, while the pollutants produced in the steel rolling link are mainly wastewater pollution such as cooling water, among which the sulfur, nitrogen oxide, smoke and dust and other gas pollutants produced in the sintering and coking links are the most serious. The emission of sulfur dioxide from coking and sintering plants exceeds two-thirds of the total emission of the whole iron and steel industry, nitrogen oxides account for about two-thirds of the whole iron and steel industry, and particulate matter exceeds 40% of the whole iron and steel industry

according to the 2015 annual report of environmental statistics, the emissions of sulfur dioxide, nitrogen oxide and smoke and dust were 1.736 million tons, 1.043 million tons and 3.572 million tons respectively, accounting for 12.4%, 9.6% and 32.2% of the emissions of key investigated industrial enterprises respectively

in June this year, the Ministry of environmental protection issued the announcement of 20 amendments to the national pollutant emission standards, such as the emission standard of air pollutants for iron and steel sintering and pelletizing industry (behind the low price purchase is the draft for comments that after-sales service cannot be fully guaranteed). Among them, five national standards for iron and steel industry production have been revised, mainly for the production processes of sintering and pelletizing. The emission concentrations of particulate matter, sulfur dioxide and nitrogen oxides have been further reduced from 50, 200 and 300mg/m to 20, 50 and 100mg/m respectively. In addition, new provisions have been made for unorganized emission control and the reference oxygen content of roasting flue gas

unorganized emission refers to the unorganized and intermittent emission in the non closed process. Pollutants escape into the atmosphere through evaporation, flash and purging in the process of production material preparation, process reaction, product rectification, drying, unloading and so on. Compared with organized emissions with special discharge outlets, unorganized emission control and governance are more difficult. It is understood that at present, a considerable part of air pollution sources in China's steel industry are discharged in an unorganized manner. From the actual situation, the exhaust gas capture rate of most large iron and steel complex enterprises is only 60% - 70%, and the unorganized flue gas emitted by some small enterprises or enterprises with low management level can reach more than 80%

the exposure draft stipulates that the unorganized emission control measures of existing enterprises shall be implemented from January 1, 2019, and the air pollution transmission channel cities of Beijing, Tianjin and Hebei shall be implemented from October 1, 2017. "Beijing Tianjin Hebei air pollution transmission channel city" is the recent "2+26" city of environmental protection supervision. There are about 167 steel enterprises in "2+26" cities. The steel production capacity of the four provinces accounts for 50% of the country, and the total steel output accounts for 40% of the country. The iron and steel industry is highly concentrated regionally, with many emission points and large emissions of air pollutants, making environmental governance and supervision more difficult

in addition, the Ministry of environmental protection will continue to complete the issuance of "2+26" urban steel and cement emission permits by the end of October this year

in addition, the "2+26" urban air pollution control action in autumn and winter will also be launched from October. Before the "operation", the production capacity of steel in the warm season will be limited, and the new regulations on peak production and transportation in coking, casting, building materials, transportation and other industries will also be implemented in succession. A number of environmental protection policies are superimposed, new emission regulations and standards are improved, environmental protection efforts are continuously upgraded and accelerated, and the steel industry will usher in the year-end environmental protection examination

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