Cement kiln smoke ammonia desulfurization system and method

Abstract

The invention provides a cement kiln smoke ammonia desulfurization system and method. The system is simple in structure and low in operation cost and one-time investment cost. The system comprises an ammonia water storage system and an ejection unit connected with the ammonia water storage system; the ammonia water storage system comprises two ammonia water storage tanks, the bottoms of the ammonia water storage tanks are connected with a high-pressure pump through valves, and the high-pressure pump is connected with the ejection unit through a flow meter and a pressure transmitter; the high-pressure pump and the flow meter are connected, and the middle between the high-pressure pump and the flow meter is connected to the tops of the ammonia water storage tanks through return pipes. According to the cement kiln smoke ammonia desulfurization system and method, the desulphurization efficiency in the desulfurization process can reach 80% or more; when a proper ratio of ammonia to sulphur is selected, additional pollution caused by ammonia escape does not exist, and no other pollution is produced; the operation cost is mainly expenses of ammonia water, and one-time investment cost and operation cost for a traditional desulfurization process are reduced.

Description

Technical field [0001] The invention relates to a desulfurization system and method, in particular to a system using cement kiln flue gas ammonia method desulfurization. Background technique [0002] In recent years, as the country has become more and more stringent on the discharge of industrial pollutants, the air pollutants of major domestic industrial enterprises include SO 2 Emissions of, NOx, etc. are all included in the key monitoring content, and emission monitoring has become normalized. In this context, traditional industries such as iron and steel and electric power have developed mature flue gas desulfurization technologies after decades of development. [0003] Compared with these companies, the cement industry, especially the new dry-process cement production line, has a slower development of desulfurization technology. On the one hand, because the cement kiln is naturally alkaline, the interior becomes a natural desulfurization device, which can suppress most of the ...

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Problems solved by technology

[0004] The common mainstream desulfurization technology is mainly wet desulfurization, which is mainly used in iron and steel, electric power and other industries. High disadvantages, it is difficult to apply to cement production line. Taking a cement production line with a clinker output of 5000t / d as an example, the investment in the construction of a supporting limestone-gypsum wet desulfurization system is more than 10 million

At present, the cement industry has overcapacity and profits are declining. The investment cost of wet desulfurization is somewhat unbearable for cement plants.

[0005] The desulfurization technologies currently used in the cement industry include dry reaction agent injection method, spray drying desulfurization method, hot raw meal injection method and other technologies, all of which have the disadvantages of low desulfurization efficiency and high initial investment cost. Therefore, the development of an initial investment cost is low and Efficient desulfurization system has positive significance for the cement industry

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