Wide-load denitration bypass flue flow distribution control system

Abstract

The invention discloses a wide-load denitration bypass flue flow distribution control system. The system comprises a flow distribution controller, a pre-mixing main flue adjusting baffle, a bypass flue adjusting baffle, a pre-mixing main flue temperature measuring instrument, a bypass flue temperature measuring instrument, a bypass flue flow measuring instrument, a post-mixing flue temperature measuring instrument and a post-mixing flue flow measuring instrument; and the input end of the flow distribution controller is connected with the pre-mixing main flue temperature measuring instrument, the bypass flue temperature measuring instrument, the post-mixing flue temperature measuring instrument and the post-mixing flue flow measuring instrument; and the output end of the flow distribution controller is connected with the control end of the pre-mixing main flue adjusting baffle and the control end of the bypass flue adjusting baffle. The system can control the flue gas temperature of aninlet of a wide-load denitration system.

Description

technical field [0001] The invention belongs to the technical field of automatic control of a wide-load denitrification system of a thermal power unit, and relates to a wide-load denitrification bypass flue flow distribution control system. Background technique [0002] According to environmental protection requirements, some power plants still need to ensure that NOx emissions meet the standards at low loads. However, due to the low temperature of the flue gas at the denitrification inlet at low loads, it cannot meet the operating needs of the SCR denitrification system, so it is necessary to set up a flue gas bypass at the denitrification inlet flue. , lead part of the flue gas in front of the economizer to the flue at the denitrification inlet, increase the temperature of the flue gas at the denitrification inlet, and ensure the normal operation of the SCR denitrification system at low load. [0003] In actual operation, it is necessary to adjust the opening of the baffle...

AI Technical Summary

Problems solved by technology

[0002]According to the needs of environmental protection, some power plants still need to ensure that NOx emissions meet the standard when the load is low, but because the flue gas temperature at the denitrification inlet is low at low load, it cannot meet the requirements of the SCR denitrification system Operation needs, so it is necessary to set up a flue gas bypass at the denitrification inlet flue, lead part of the flue gas before the economizer to the denitrification inlet flue, increase the temperature of the flue gas at the denitrification inlet, and ensure the normal operation of the SCR denitrification system at low load

[0003]In actual operation, it is necessary to adjust the opening of the main flue and bypass flue before mixing to distribute the flue gas flow reasonably. While the temperature of the post-denitration inlet flue meets the operating requirements, it ensures the safe and economical operation of the entire unit. However, there is no similar disclosure in the prior art.

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