Low-ammonia-escape desulfurization, denitrification and dust removal device

Abstract

The invention relates to the technical field of flue gas treatment, and provides a low-ammonia-escape desulfurization, denitrification and dust removal device. The device comprises a shell, a ceramiccatalytic filter layer and a catalyst layer are sequentially arranged in the shell in the airflow direction, and the ceramic catalytic filter layer is used for filtering desulfurization products and dust and carrying out primary denitrification on flue gas; and the catalyst layer comprises at least one denitration catalyst layer and at least one ammonia oxidation catalyst layer, the ammoxidation catalyst layer is arranged at the downstream of the gas flow of the denitration catalyst layer in a laminated manner, the denitration catalyst layer is used for carrying out secondary denitration on the flue gas subjected to primary denitration, and the ammoxidation catalyst layer is used for removing excessive ammonia in the flue gas subjected to secondary denitration. Desulfurization, denitrationand dust removal are integrated, and a two-stage denitration structure is adopted, so denitration is more sufficient and efficient; and the ammonia oxidation catalyst layer is additionally arranged,so low ammonia escape is effectively guaranteed, and the emission requirement is met.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a low-ammonia escape desulfurization, denitrification and dust removal device. Background technique [0002] As society pays more and more attention to environmental protection, the requirements for exhaust gas emissions (such as nitrogen oxides, sulfur dioxide, dust, etc.) are becoming increasingly stringent. At present, more specific and strict emission requirements are put forward for industries such as power plants, industrial kilns, steel industry, and coking industry. [0003] There are many types of industrial kilns, so the composition of the flue gas produced is also very different. Many industrial kilns have a high content of nitrogen oxides, which can reach tens of thousands of mg / Nm 3 . At present, the most mainstream denitrification technology is Selective Catalytic Reduction (SCR, Selective Catalytic Reduction). Its principle is to use ammonia gas to de...

AI Technical Summary

Problems solved by technology

[0004] For nitrogen oxide content up to tens of thousands mg / Nm 3 In terms of working conditions, under the premise of ensuring the escape of ammonia at the outlet (generally less than 3ppm), it is impossible to rely solely on the denitrification catalyst to meet the nitrogen oxide emission requirements (generally ≤50mg / Nm 3 ), therefore the emission requirements can only be guaranteed by excessive injection of ammonia

But excessive ammonia slip can cause air pollution

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