Method for predicting blockage of air pre-heater

Abstract

The invention discloses a method for predicting blockage of an air pre-heater. The method comprises the following steps: detecting and testing a # 1 machine, an SCR (Selective Catalytic Reduction) denitration system, the air pre-heater and ammonia injection control logic in a targeted manner, and collecting data; transforming a one-way soot blower into a two-way soot blower, arranging a steam pipe for purging oxide skin at each ammonia supply grid, and transforming an air pre-heater soot blowing system and an ammonia supply system of the # 1 machine. Units are detected and tested in a targeted mode, data is collected, the system is optimized and improved, data monitoring, a heat transfer algorithm, ammonium bisulfate characteristics and other elements are effectively combined, an air pre-heater heat transfer model is built, generation of ammonium bisulfate of the air pre-heater in the deep peak regulation period is effectively avoided. Blockage degree of the air pre-heater is accurately predicted by analyzing parameter changes, an operator is assisted to take prevention and control measures in advance, ammonium bisulfate blockage of the air pre-heater is avoided, and safe and economical operation of units is guaranteed.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a method for predicting air preheater clogging. Background technique [0002] A large number of thermal power units across the country have undergone ultra-clean emission transformation to meet the new environmental protection emission standards. However, while each thermal power unit is performing ultra-clean operation, air preheater clogging occurs to varying degrees. The reason for the blockage is: no A large amount of ammonia gas participating in the reaction increases, and the escaping ammonia gas reacts with SO3 in the flue gas to form ammonium bisulfate. The liquid ammonium bisulfate is extremely viscous and easily sticks to the fly ash in the flue gas, which is produced in the air preheater. Accumulated blockage will affect the output of the unit. [0003] Under ultra-clean operating conditions, more and more thermal power units are troubled by air prehe...

AI Technical Summary

Problems solved by technology

[0002] A large number of thermal power units across the country have undergone ultra-clean emission transformation to meet the new environmental protection emission standards. However, while each thermal power unit is performing ultra-clean operation, air preheater clogging occurs to varying degrees. The reason for the blockage is: no A large amount of ammonia gas participating in the reaction increases, and the escaping ammonia gas reacts with SO3 in the flue gas to form ammonium bisulfate. The liquid ammonium bisulfate is extremely viscous and easily sticks to the fly ash in the flue gas, which is produced in the air preheater. Accumulated blockage, affecting unit output

[0003] Under ultra-clean operating conditions, more and more thermal power units are troubled by air preheater clogging, and more and more thermal power plants have carried out technical research on "reducing air preheater clogging", but neglected the optimization and prevention of air preheater clogging

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