Views: 96 Author: Site Editor Publish Time: 2021-06-18 Origin: Site
It is estimated that SO2 emissions from the cement industry account for 3% to 4% of the national SO2 emissions. The SO2 emission of cement enterprises mainly comes from sulfide in raw materials.
In the second and third preheaters, the decomposition rate of CaCO3 is low, and only a small amount of CaO is brought from the high temperature zone in the gas stream, which has a weak absorption capacity of SO2, resulting in high SO2 emission concentration in the exhaust flue gas.
How to achieve efficient and rapid adsorption of SO2 in the second and third preheaters and accelerate the oxidation to SO3, and at the same time promote the adsorption of SO3 in the raw material to ultimately reduce SO2 emissions is the key to desulfurization technology. This paper introduces the working mechanism and industrial application of a new polymeric environmental protection desulfurizer, which promotes the conversion of SO2 to SO3 through the oxidation component of the desulfurizer, and at the same time strongly adsorbs SO2 and finally generates sulfate by its unique polymeric component functional groups.
Thus, a simple, flexible, environmentally friendly and low cost desulfurization process can be implemented, opening up a new direction for desulfurization in the cement industry.
The cement industry is a typical energy- and resource-consuming industry, and both coal and cement raw materials produce SO2 during high-temperature calcination. 2013 national sampling results show that the average SO2 emission concentration of cement enterprises is 59.0 mg/Nm3, with a maximum value of 310 mg/Nm3.
China's cement production has been the world's largest in recent decades, accounting for about 50% of the world's total cement. By the end of 2019, China had 1,624 new dry-process production lines and the national cement output was 2.33 billion tons, so the SO2 emission problem of China's cement industry cannot be ignored.
In order to strengthen the control of SO2 emissions in the cement industry, the country has formulated the corresponding emission standard GB 4915-2013 "Emission Standard for Air Pollutants in Cement Industry" requiring SO2 emissions in cement production not to exceed 200 mg/Nm3, Guangdong, Shandong, Beijing, Tianjin, Hebei, Zhejiang, etc. requiring SO2 emissions not to exceed 100 The further tightening of pollutant emission standards in the cement industry is an inevitable trend in the future development of the industry, which directly affects the efficiency of cement enterprises and even threatens their survival.
Therefore, to increase the innovation of desulfurization technology in cement industry, improve the efficiency of desulfurization and reduce the cost of desulfurization is an urgent problem for cement enterprises.
