Single-side exhaust gas temperature rise test method for treating blockage of air preheater

Abstract

The invention discloses a single-side exhaust gas temperature rise test method for treating blockage of an air preheater, and belongs to the coal-fired power generation industry. The method mainly comprises test basic conditions and requirements, test operation and requirements, test risk points and control measures, test effect evaluation and the like. The basic test conditions and requirements comprise pre-test preparation and test working condition requirements. The test operation and requirements comprise an adjusting method for opening an air feeder outlet connecting door, an adjusting method for closing the air feeder outlet connecting door, and common operation points and requirements of the two adjusting methods. The test risk points and control measures comprise tripping and low-temperature corrosion of an air preheater, vibration of an induced draft fan, high temperature of a bearing, high temperature of flue gas at an inlet of a desulfurization system, and surge and stall ofan air feeder. The test effect evaluation comprises three evaluation indexes of temperature rise side air preheater flue gas side differential pressure drop, temperature rise side air preheater fluegas side differential pressure speed reduction at a target temperature and test power consumption increase. Safe and economical operation of the unit can be guaranteed.

Description

technical field [0001] The invention relates to a single-side smoke exhaust temperature raising test method for controlling blockage of an air preheater, which belongs to the coal-fired power generation industry. Background technique [0002] The air preheater is an important part of the boiler equipment in coal-fired power plants, which can effectively improve the economical efficiency of the boiler operation. However, when the air preheater is blocked, it will increase the resistance of the boiler's air and smoke system and increase the power consumption rate of the draft / induction fan. In extreme cases, it will affect the load capacity of the unit and cause equipment problems such as stalling of the induced draft fan. In recent years, thermal power units across the country have implemented ultra-low emission transformation, and large-scale coal-fired units in service have been gradually transformed and put into use. Flue gas denitrification devices, most of which use SCR ...

AI Technical Summary

Problems solved by technology

Overhaul, maintenance, and technical transformation require the unit to be shut down, which cannot solve the problem of blockage of the air preheater in the operating unit in time; for the adjustment method of the unit’s thermal operation, it mainly includes fuel characteristics and blending methods, boiler NO x Emission concentration optimization, ammonia injection optimization and adjustment, denitrification control system optimization and denitrification control system optimization, etc. These methods are mainly aimed at preventing and delaying the clogging of the air preheater. For the air preheater, the problem of ammonium bisulfate type clogging has obviously occurred, and the treatment effect not significant

At present, some power plants have carried out the temperature rise method to control the blockage of the air preheater based on the principle that the viscosity of ammonium bisulfate turns into a gaseous state after the temperature rises, and the temperature rise method is used to control the blockage of the air preheater. However, due to the lack of effective guidance on test methods, requirements and procedures, etc., Governance effects are difficult to guarantee

In the literature, Zhang Chenjun published two papers, "Analysis of the Effect of Air Preheater Clogging by High Pressure Water Flushing and Heating Gasification Ammonium Bisulfate" and Li Honggang's "Research and Application of Heating Technology to Treat Air Preheater Blockage", It mainly briefly introduces the principle, case and precautions of heating air preheater blockage. There are also problems in the selection of some operating parameters, and the test preparation, working condition requirements, operation process, key parameter selection, dangerous point control, and effect evaluation are not discussed. comprehensive system elaboration

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