With the advancement of green development in the industry, ultra-low emission is becoming the standard of cement enterprises in more and more areas, and as an important part of pollutant control in cement plants, ultra-low emission of nitrogen oxides is imperative.
At present, a number of denitrification technology solutions have emerged in China, some of which can make nitrogen oxide emissions meet ultra-low emission requirements in a short time, but it is difficult to achieve long-term stable operation, and may also cause a large number of ammonia escape problems, which not only wastes resources, but also brings more serious secondary environmental problems. Yang Peisen, chairman of
Tianjin Chaoyang Environmental Protection Technology Group Co., Ltd. (Hereinafter referred to as "Chaoyang Group"), said, "In essence, the production of ammonia itself is a high energy-consuming industry, so in the process of denitrification of cement production line, we should try our best to reduce the generation of pollutants, reduce the amount of ammonia, and reduce the amount of ammonia escape. Ammonia is also the main cause of environmental problems such as haze, and ammonia escape in the process of industrial denitrification is one of the important sources of ammonia in China's atmospheric environment.
Yang Peisen also pointed out that the essence of environmental protection is to solve the pollution problem, not the transfer of pollution, which is also an important reason for Chaoyang Group to vigorously promote the development and application of thermal carbon catalytic reduction denitrification technology. Application
of
thermal carbon catalytic reduction composite denitrification technology in a cement plant It is known that the thermal carbon catalytic reduction technology has three major characteristics: 1, it can greatly reduce the amount of ammonia, improve the combustion efficiency of coal, and save coal consumption; 2, it can save a lot of environmental protection taxes for users; 3. The catalyst used in this technology is mainly aluminosilicate minerals, which are blended into cement clinker after denitration to achieve a slight increase in the output of cement enterprises. Thermal carbon catalytic reduction technology has obvious advantages
in reducing ammonia consumption. Data show that as early as June 2018, Chaoyang Group completed the first non-SCR denitrification transformation of cement production line in Henan Province (under stable operation) with nitrogen oxide emission less than 50 mg/m ³ and ammonia emission less than 3 mg/m ³ (which can be verified by all existing testing methods).
In a production line with a designed capacity of 3,200t/d of a cement enterprise in Henan Province, the thermal carbon catalytic reduction composite denitrification technology has achieved a stable NOx emission of less than 50mg/m ³ for nearly 40 consecutive months; The actual control value is 15-40mg/m ³, and the ammonia escape is not more than 6mg/m ³. After monitoring by various methods, the ammonia escape is still below 3mg/m ³ for a long time. In terms of energy consumption, the physical coal consumption per ton of clinker is reduced by more than 2kg, and the actual output is optimized to about 4400t/d year by year. Yang Peisen said.
Ammonia escape control is an unavoidable problem in the treatment of nitrogen oxides in cement plants. In addition to thermal carbon catalytic reduction technology, what other technical solutions can reduce ammonia escape or even do not use ammonia water? 24-25 April, China Cement Network will hold the "China Cement Industry Green Development Summit Forum and Ultra-clean Emission Technology Exchange Conference " and the " Fourth China Cement Intelligent Summit Forum" in Changsha, Hunan Province. The meeting will discuss the current environmental protection topics of concern to the cement industry, please pay attention.