Boiler energy saving and flue gas white smoke removal system, process and application

Abstract

The invention provides a boiler energy saving and flue gas white smoke removal system, process and application. The boiler energy saving and flue gas white smoke removal system comprises a boiler, a denitration device, a rotary air preheater, an air mixing heater, a flue gas air heater, an electrostatic dust collector, a desulfurization tower and a chimney which are connected in sequence. The process comprises the following steps that ambient air is taken as a cold medium of the flue gas air heater and the air mixing heater, warm air of 80-140 DEG C generated by heat exchange of the flue gas air heater is taken as a cold medium of the rotary air preheater, mixed hot air over 160 DEG C obtained by heat exchange of the air mixing heater is introduced into a flue between the desulfurization tower and the chimney to heat clean flue gas, the flue gas sequentially passes through the rotary air preheater, the air mixing heater and the flue gas air heater for heat exchange to obtain flue gas of 85-120 DEG C, and the flue gas of 85-120 DEG C flue gas enters the electrostatic dust collector. The boiler energy saving and flue gas white smoke removal system is high in cost performance, can beused for preventing secondary blockage of ammonium bisulfate of a coal-fired unit, and can be applied to the coal-fired unit in the fields of petroleum, chemical engineering, metallurgy, electric power, ships, central heating, machinery, food, pharmacy and the like.

Description

technical field [0001] The invention relates to a boiler energy saving and flue gas dewhitening system, process and application, specifically a boiler energy saving and flue gas dewhitening system, based on the technology and application of the boiler energy saving and flue gas dewhitening system. Background technique [0002] When the boiler flue gas is discharged from the chimney to the atmosphere, water vapor will condense when the flue gas is cooled, and the condensed water will reduce the transmittance of the flue gas, thus showing the phenomenon of white smoke from the chimney, that is, a white plume. In order to meet the requirements of environmental protection, measures need to be taken to eliminate the white plume of the chimney. For this reason, CN207778477U discloses a kind of device for eliminating the white smoke plume of boiler chimney, comprises boiler, rotary air preheater, dry dust collector, induced draft fan, desulfurization absorption tower and chimney co...

AI Technical Summary

Problems solved by technology

The heat source of the air heater in this system comes from wet flue gas, which can ensure that the temperature of the primary and secondary wind energy entering the air preheater inlet is basically unchanged. Although it can solve the low temperature corrosion of the air preheater, the temperature of the hot air is not high enough, and there is still sulfuric acid The risk of ammonium bisulfate clogging, not to mention the problem of clogging and wear leakage caused by secondary condensation of ammonium bisulfate in low-temperature economizers

[0004] In addition, the existing flue gas dewhitening system belongs to a single technology, which can neither solve the low-temperature corrosion and ammonium bisulfate clogging problems of the rotary air preheater, nor save energy (such as GGH, SGH, etc.) or have very limited energy-saving effects (such as MGGH), and the most commonly used MGGH flue gas de-whitening system, water leakage occurs within less than 3 years of operation, which seriously affects the flue gas de-whitening effect, and the operation and maintenance costs are also very high

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