Garbage incineration waste heat boiler flue gas backflow system

Abstract

The invention provides a garbage incineration waste heat boiler flue gas backflow system. The system comprises an electrostatic dust remover, an electric inlet adjusting air door, a backflow fan, an outlet electric closing baffle door, a flue gas check valve, a manual shut-off valve, a flue gas pipe box and injection nozzles which are sequentially connected from a garbage incineration boiler fluegas outlet. The injection nozzles are arranged on the flue gas pipe box on a rear side wall of a boiler third flue. After flue gas on the tail portion of a boiler passes through the electrostatic dustremover, part of the clean flue gas is extracted by the backflow fan and enters the pipe box on the rear side walls of three flues of the boiler, and the flue gas is sprayed into the three flues at positive pressure at high speed to be mixed with high-temperature flue gas in the flues turbulently. The backflow flue gas is ejected into the flues in the middle of the third flue and is fully and turbulently mixed with the high-temperature flue gas, and the problems that the temperature field and the speed field of the third flue are not uniform are effectively relieved. The measured service lifeof a superheater can reach 10 years or longer, and meanwhile, the heat efficiency of the boiler is also improved.

Description

technical field [0001] The invention relates to the field of waste incineration power generation, in particular to a flue gas return system of a waste heat waste heat boiler. Background technique [0002] With the development of the domestic waste incineration power generation industry, in order to obtain higher power generation benefits, the main steam parameters of waste heat boilers have been continuously improved; the operating characteristics of waste heat boilers have determined that with the increase in the operating time of waste Ash deposits and slagging on the hot surface continue to accumulate, the heat exchange in the high temperature section decreases, and the high temperature flue gas section continues to move backwards, resulting in the excessively high temperature flue gas going to exchange heat with the superheater steam of the waste heat boiler, causing the wall surface of the superheater to overheat and cause Corrosion at high temperature, pipe wall thickn...

AI Technical Summary

Problems solved by technology

However, as the operating time of the boiler increases with these existing methods, coking, slagging, and ash accumulation on the newly added radiant heat surface of the third flue at the front will occur repeatedly, and the phenomenon of overheating of the flue gas temperature at the inlet of the high-temperature superheater will appear again. Corrosion is inevitable

Images