Air pre-heater ash deposition treatment system and method used in flexible operation mode

Abstract

The invention discloses an air pre-heater ash deposition treatment system and method used in a flexible operation mode, and relates to the technical field of air pre-heater ash deposition treatment. The system comprises a coal-fired boiler, an SCR (Selective Catalytic Reduction) denitration system, a flue gas online monitoring system, an air preheater and a flue gas emission system which are sequentially communicated through a pipeline, the primary air pipe penetrates through the air side of the air preheater and then is connected with a coal mill; the coal mill is connected with one end of the coal-fired boiler; the secondary air pipe penetrates through the air side of the air preheater and then is connected with the other end of the coal-fired boiler; the primary air pipe and the secondary air pipe are respectively connected with an air volume adjusting device which is arranged in parallel with the air side of the air preheater; and an air preheater state online monitoring system connected with the control system is mounted on the air preheater. According to the air pre-heater ash deposition treatment method based on the system in the flexible operation mode, ash clogging of the air pre-heater is prevented, and meanwhile the heat exchange efficiency of the air pre-heater is improved to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of air preheater ash accumulation treatment, in particular to a system and method for air preheater ash accumulation treatment in a flexible operation mode. Background technique [0002] With the continuous increase of the proportion of new energy in the power industry, the role of traditional coal-fired units has changed from a "supporting" power supply to a "peak-shaving" power supply, and more flexible operation methods play the role of regulating power supply. In the flexible operation mode, factors such as lower operating temperature of the air preheater, increased ammonia escape from the denitrification system, and large fluctuations in sulfur content of different coals will aggravate the NH of the air preheater. 4 HSO 4 deposition problem. Dust clogging of the air preheater will lead to problems such as reduced heat transfer capacity and increased flow resistance, which in turn will lead to a series...

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Problems solved by technology

[0006] The invention provides an air preheater ash accumulation control system for flexible operation mode, which solves the problem of NH in the air preheater under flexible operation conditions 4 HSO 4 Deposition and NH 4 HSO 4 Difficulties to remove; including coal-fired boilers, SCR denitrification systems, and flue gas online monitoring systems connected in sequence through pipelines. The end of the flue gas online monitoring system is connected to the flue gas side of the air preheater, and the air preheater The end of the flue gas side of the air preheater is connected with a flue gas discharge system; the air side of the air preheater is respectively connected with a primary air duct and a secondary air duct, and the primary air duct passes through the air side of the air preheater A coal mill is connected, and the coal mill is connected to one end of the coal-fired boiler; the secondary air pipe passes through the air side of the air preheater and is connected to the other end of the coal-fired boiler; The primary air pipe and the secondary air pipe are respectively connected with an air volume adjustment device arranged in parallel with the air side of the air preheater; the air preheater is equipped with an online monitoring of the state of the air preheater connected to the control system system; the air preheater is equipped with heat accumulator

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