Dust removal and denitration equipment and method for transforming same

Abstract

The invention belongs to the field of dust removal and denitration, and particularly relates to dust removal and denitration equipment and a method for transforming the same. The dust removal and denitration equipment comprises a high-temperature dust remover, an ammonia spray system and an SCR (selective catalytic reduction) reactor. An outlet of the high-temperature dust remover is connected with an inlet of the SCR reactor, and the ammonia spray system is arranged at the front of the high-temperature dust remover or is arranged between the high-temperature dust remover and the SCR reactor.The dust removal and denitration equipment and the method for transforming the dust removal and denitration equipment have the advantages that the problems of vulnerability to abrasion, poisoning andblocking of SCR catalysts in high-concentration dust environments can be solved, the problems of abrasion of waste heat boilers and dust accumulation of pipe walls can be solved, the denitration efficiency can be improved, land occupation of the dust removal and denitration equipment can be economized, the heat exchange efficiency can be greatly improved, and the service lives of boilers can be greatly prolonged.

Description

Technical field [0001] The invention belongs to the field of dust removal and denitration, and particularly relates to a dust removal and denitration device and a modification method thereof. Background technique [0002] With the continuous improvement of national environmental protection standards, the existing denitrification technologies in the cement industry (including SNCR denitrification, low-nitrogen combustion, staged combustion, etc.) have low denitrification efficiency, generally around 60% to 80%, which can no longer meet higher NOx emissions Standard, it is necessary to adopt more efficient SCR denitration technology. Affected by the optimal reaction temperature of the SCR catalyst and ammonium bisulfate, the optimal position for SCR denitration is near the outlet of the preheater. In order to save energy, the cement industry uses a multi-stage cyclone preheater to preheat the raw meal powder. The dust removal efficiency is low, and the dust concentration at the ou...

AI Technical Summary

Problems solved by technology

In order to save energy, the cement industry uses a multi-stage cyclone preheater for heat exchange and preheating of the raw meal powder. The dust removal efficiency is low, and the dust concentration at the outlet of the primary cylinder is relatively high.

High-concentration dust will quickly cause wear, alkali metal poisoning, and clogging of the SCR catalyst, which will greatly reduce the denitrification efficiency and life of the SCR catalyst. Therefore, high-temperature dust removal is required before SCR denitrification

However, the existing cement production process equipment is too much, the space is compact, and there is no extra space to place a high-temperature dust collector

At the same time, the high-concentration dust entering the waste heat boiler in the existing waste heat utilization process will cause wear and tear of the heat exchange tubes, dust accumulation, and reduce heat exchange efficiency.

[0003] Therefore, based on these problems, a method is provided to solve the problems of easy wear, poisoning and clogging of SCR catalysts in a high-concentration dust environment, and at the same time solve the problems of waste heat boiler wear and tube wall ash accumulation, improve denitrification efficiency, save equipment occupation, and greatly improve Dust removal and denitrification equipment and its transformation method for heat exchange efficiency and boiler life have important practical significance

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