SCR denitration reaction device of coupling coal economizers

Abstract

The invention discloses a SCR denitration reaction device of coupling coal economizers. The SCR denitration reaction device comprises a SCR denitration reaction unit, an inlet flue duct arranged on the top part of the SCR denitration reaction unit, and an outlet flue duct arranged on the bottom of the SCR denitration reaction unit; ammonia injection grids are arranged on the inlet flue duct; a flue outlet of the SCR denitration reaction unit is provided with a coal economizer; the bottom of the coal economizer is connected with the outlet flue duct; the inlet flue duct and the outlet flue duct are externally connected with a boiler main body respectively. The SCR denitration reaction device is simple in structure; occupied land area is small; manufacturing cost is low; energy is saved; reaction performance of the SCR denitration reaction device is excellent; and connection of the inlet flue duct and the outlet flue duct is simple.

Description

technical field [0001] The invention belongs to the field of SCR flue gas denitrification, in particular to an SCR denitrification reaction device coupled with an economizer. Background technique [0002] At present, the main economizer in the conventional SCR denitrification device is generally installed in the front of the SCR reactor, and the flue gas at the boiler outlet first passes through the economizer and then flows through the SCR reactor for reaction. The flue gas temperature is lower than the lower limit of the applicable temperature range of the catalyst, which causes side reactions of the mixed gas of flue gas and reducing agent on the catalyst, which reduces the activity of the catalyst and deteriorates the reaction effect. Moreover, this structural design will cause insufficient space between the economizer at the end of the boiler and the air preheater, which will affect the connection of the inlet and outlet flues. Contents of the invention [0003] In o...

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Problems solved by technology

[0002] At present, the main economizer in the conventional SCR denitrification device is generally installed in the front of the SCR reactor, and the flue gas at the boiler outlet first passes through the economizer and then flows through the SCR reactor for reaction. The flue gas temperature is lower than the lower limit of the applicable temperature range of the catalyst, which causes side reactions of the mixed gas of flue gas and reducing agent on the catalyst, reducing the activity of the catalyst and deteriorating the reaction effect

Moreover, this structural design will cause insufficient space between the economizer at the end of the boiler and the air preheater, which will affect the connection of the inlet and outlet flues

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