Tubular air preheater and heat exchange tube replacement method

Abstract

The invention discloses a tubular air preheater. The tubular air preheater comprises two sealing plates, and multiple heat exchange tubes connected between the two sealing plates; the heat exchange tubes include two heat exchange tube sections; and the heat exchange tube sections are connected to form the heat exchange tubes. The invention further provides a heat exchange tube replacement method; multiple heat exchange tubes required to be replaced and two original sealing plates corresponding to the heat exchange tubes required to be replaced are dismounted; the two replaced sealing plates are correspondingly fixed in the positions of the two original sealing plates; two ends of two heat exchange tube sections of the replaced heat exchange tubes are respectively connected with the two replaced sealing plates; and at least two heat exchange tube sections of the replaced heat exchange tubes are connected in sequence. Through the mode, local replacement of the heat exchange tubes is realized, the boiler heat efficiency is improved, the coal and electricity consumption is reduced, the resource utilization efficiency is improved, and the economic benefit is increased; and meanwhile, modules of the whole air preheater have no need to be replaced, so that the production cost is further reduced, and the resource waste is reduced.

Description

technical field [0001] The invention relates to the technical field of thermal power generation, in particular to a tube-type air preheater and a heat exchange tube replacement method. Background technique [0002] The air preheater is a heating device that preheats the air before entering the boiler to a certain temperature through the internal heat sink through the flue gas in the tail flue of the boiler, which is used to improve the heat exchange performance of the boiler and reduce energy consumption. During the long-term use of the air preheater, it is affected by many factors such as the acid dew point of the flue gas, the coal type and water content, the air temperature and humidity, the excess air coefficient, the sulfur content in the coal type, the ash content, and the fly ash ratio. , resulting in severe wear of many heat exchange tubes. [0003] The wear and tear of the heat exchange tube directly causes the reduction of the thermal efficiency of the boiler. Und...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a tube-type air preheater and a method for replacing heat exchange tubes, aiming to solve the problems caused by the reduction of boiler thermal efficiency caused by the inability to partially replace the damaged heat exchange tubes of the air preheater and the overall replacement of the air preheater. waste of resources and cost

Images