GGH (gas-gas heater) heating system capable of preventing wet smoke from corroding and blocking pipeline and application method

Abstract

The invention relates to the field of industrial desulfuration, in particular to a GGH (gas-gas heater) heating system capable of preventing wet smoke from corroding and blocking a pipeline and an application method. Smoke generated from combustion of a coal boiler is delivered by an induced draft fan, and large-particle impurities in the smoke are adsorbed by a dust remover. The wet smoke entersa demister after passing through a desulfuration device. The demister comprises a maze-type mist removing device and an electric-capture mist removing device, and large liquid-phase gypsum in the wetsmoke is captured and removed. Only dispersed-phase gypsum drops are left in the wet smoke processed by the demister. Instantaneous heat transfer and mass transfer are realized through rapid mixing ofcold smoke and hot smoke, the dispersed-phase gypsum drops of the wet smoke are evaporated rapidly, the contents of the liquid-phase gypsum and the dispersed-phase gypsum drops in the smoke are reduced, blocking and corrosion probability is reduced greatly during later discharge, and accordingly, the problems of frequent corrosion and blockage of GGHs, high equipment operation cost and short equipment operation time due to prevalent high smoke operation pressure in GGH systems are solved.

Description

technical field [0001] The invention relates to the field of industrial desulfurization, in particular to a GGH heating system and a use method for preventing wet flue gas from corroding and blocking pipelines. Background technique [0002] The GGH heating system is a heating system based on the gypsum wet flue gas desulfurization method. It uses the original flue gas to heat the desulfurized clean flue gas, so that the exhaust gas temperature reaches above the dew point, reduces the corrosion of the inlet flue and chimney, and improves Diffusion of pollutants; at the same time, reduce the temperature of flue gas entering the absorption tower, and reduce the technological requirements for anti-corrosion in the tower. [0003] The existing GGH flue gas reheater increases the temperature of the net flue gas by 25-40°C, and the temperature of the net flue gas after desulfurization reaches above the dew point temperature, which reduces the corrosion of the flue gas on the flue a...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the high operating pressure of flue gas generally in the existing GGH system, which contains relatively high liquid phase gypsum and dispersed phase gypsum droplets, resulting in frequent corrosion and blockage of the GGH, resulting in high operating costs of the equipment and long time for the equipment to be put into operation Shorter question, to provide a GGH heating system and method of use that prevent wet flue gas from corroding and clogging pipelines

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