Low-temperature synchronous denitration and desulfurization equipment and process for flue gas

Abstract

The invention belongs to the field of flue gas purification technology, and particularly relates to low-temperature synchronous denitration and desulfurization equipment and process for flue gas. The low-temperature synchronous denitration and desulfurization equipment for the flue gas comprises a residual heat boiler (1), a reaction tower (3), an absorption tower (4) and a water circulation system (5); the residual heat boiler (1) is arranged at the outlet end of the flue gas of the equipment, the reaction tower (3) is arranged at the flue gas outlet end of the residual heat boiler (1), the reaction tower (3) is arranged at the flue gas outlet end, the reaction tower (3) is provided with a flue gas inlet I (10) and a flue gas outlet I (11); the reaction tower (3) is internally provided with an ammonia steam injection system (5), an inlet of the ammonia steam injection system (5) is formed between the flue gas inlet I (10) and the flue gas outlet I (11); the absorption tower (4) is provided with a flue gas inlet II (18) and a flue gas outlet II (18). According to the low-temperature synchronous denitration and desulfurization equipment and process for the flue gas, the effective removal of NOX and SO2 in the flue gas can be realized, the standard flue gas is emitted, and products can be used as an inorganic fertilizer, and thus the zero emission is realized.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, in particular to a low-temperature synchronous denitrification of flue gas [0002] Desulfurization equipment and technology. Background technique [0003] The flue gas denitrification of industrial furnaces is an environmental protection policy proposed and promoted by the state in recent years. It is in the stage of development and exploration; at present, the flue gas denitrification methods of industrial furnaces include SNCR and SCR methods, both of which are high-temperature flue gas denitrification, requiring a high temperature window and catalysts, etc. However, industrial furnaces are generally equipped with waste heat power generation systems, so There is no suitable temperature entry point for high-temperature and medium-temperature denitrification; the temperature window is 390-420°C for SCR denitrification o C, apply SNCR denitration method, the temperature window is ...

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Problems solved by technology

[0003] The flue gas denitrification of industrial furnaces is an environmental protection policy proposed and promoted by the state in recent years. It is in the stage of development and exploration; at present, the flue gas denitrification methods of industrial furnaces include SNCR and SCR methods, both of which are high-temperature flue gas denitrification, requiring a high temperature window and catalysts, etc. However, industrial furnaces are generally equipped with waste heat power generation systems, so There is no suitable temperature entry point for high-temperature and medium-temperature denitrification; the temperature window is 390-420°C for SCR denitrification o C, apply SNCR denitration method, the temperature window is 900-1100°C, choose 390-420 o C and the temperature range of 900-1100°C are used as the denitrification area, and there are the following problems: firstly, this area is a high-temperature and high-dust area, and the smoke and dust will poison the catalyst. Short to failure; if dust is removed before this area, there is no suitable dust removal equipment at this temperature; secondly, the use of SCR denitrification will also bring about a drop in flue gas temperature, increase system resistance, and reduce the thermal efficiency of the waste heat boiler by about 20%. Reduced power generation revenue; using the SNCR method for denitrification, due to the limitation of the temperature range, generally requires the transformation of industrial kilns, and the feasibility is low; in order to achieve this without affecting the normal operation of existing facilities and kilns and the efficiency of waste heat power generation Flue gas denitrification and desulfurization, after research, carry out NO in the low temperature area after waste heat recovery X / SO 2 Synchronous removal at low temperature is the most feasible; with the development of flue gas desulfurization and denitrification technologies, all countries have carried out research on low-temperature flue gas simultaneous desulfurization and denitrification technologies. experimental stage

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