| Under the trend of that masses of people have a higher requirement of both material and spiritual civilization, the environmental air quality directly affects people's life, work and travel. in order to protect people's health fundamentally, Ministry of Environmental Protection made the latest environmental air quality standards, had the strict standard limit on the atmospheric sulfur dioxide, nitrogen oxides, carbon monoxide, particulate matter, ozone and fine particulate matter all. As one of the 113 key environmental protection cities, Jinchang has to strictly carry out the above six standard limit. But as a result of Jinchang is located in the northwest edge of the desert, the particulate matter in air and fine particulate matter in the very great degree by natural factors interference, which it's hard to be not strictly controlled by men, carbon monoxide and ozone concentration are under control according to monitoring, sulfur dioxide and nitrogen oxide emissions mainly come from industrial enterprises production, only control the pollutant emissions by industrial enterprises can reduce the influence of sulfur dioxide and nitrogen oxides in the air. Nitrogen oxide is one of the major pollutants in the atmosphere. After the denitration of thermal power industry running smoothly, the government devote greater effort to the NOx emission control in cement industry-oriented other industries. The government will publish new standard that requires the NOx emission concentration in cement kiln discharge strictly by 50%.Based on the above reasons, the revolution about the denitration technology of 1000t/d cement kilns in Jinni group is imperative.Now,no catalyzers, the high reaction temperature and low fixed investment in SNCR denitration technology are considered as the best technology that can be used in rotary kiln of cement industry. Through comparing with low NOx burner, SCR and fractional combustion denitration technologies, and overall consideration, this cement kiln will choose the common SNCR De-NOx technology to carry on the denitration transformation.On the basis of using the mature denitration and reconstruction technology of cement industry at home and abroad, the article makes a feasibility study on reduction of the pollution to the environment by controlling NOx, company's financial and economic condition and the existing mature denitration technology, combining with the current production, available site, equipment in use and personnel assignment, etc of 1000t/d cement kiln production line of Jinni group, aiming to lay the foundation for the denitration project goes into operation smoothly and meets the technical requirements.After testing and putting into use of Denitration technological upgrading projects,the denitration effect is obvious in terms of stable running, high automation level, the average preheater nox emissions concentration is controlled from the before modification below 320 mg/Nm3 to 600mg/Nm3 Under the condition of normal production of various pollutants discharge can reach the national standard limit, not only can solve the problem of corporate excess emissions of nitrous oxide and improve the local environment, but also make greater contribution to the virtuous cycle economic development of the enterprise,which conform to the expected design goal. |
PDF Full Text Request