Heating process of low-temperature flue gas with wetting flue gas desulphurization

A wet flue gas desulfurization and low-temperature flue gas technology, applied in lighting and heating equipment, etc., can solve the problems of unstable desulfurization performance, poor heating effect, uneconomical operation, etc., so as to improve the lifting and diffusion effect and reduce power consumption. , the effect of flexible adjustability

Inactive Publication Date: 2010-05-05
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a wet method that can completely solve the problems of poor heating effect,

Method used

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  • Heating process of low-temperature flue gas with wetting flue gas desulphurization
  • Heating process of low-temperature flue gas with wetting flue gas desulphurization
  • Heating process of low-temperature flue gas with wetting flue gas desulphurization

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Embodiment 1

[0010] Example 1, see figure 1 , the present invention removes the GGH, the outlet of the absorption tower is directly connected to the chimney through a pipeline, and the hot secondary air of the boiler air preheater for heating the low-temperature flue gas at the outlet of the absorption tower is connected to the pipeline connecting the absorption tower and the chimney The hot secondary air pipe of the boiler air preheater is also equipped with a hot secondary air regulating valve. Its operation process is as follows: the flue gas enters the absorption tower 2 after passing through the dust collector 1, and the low-temperature flue gas desulfurized by the absorption tower 2 goes to the chimney 4 through the pipeline. The pipeline connected to the chimney 4 is connected with the hot secondary air pipe 5 of the boiler air preheater for heating the low-temperature flue gas at the outlet of the absorption tower, and the low-temperature flue gas is heated to the required temperat...

Embodiment 2

[0011] Example 2, see figure 2 , the present invention retains GGH, and changes the original GGH heat exchange element into a plate-type GGH heat exchange element with a larger gap, but the effect of heat exchange is reduced in this way. It is connected to the hot secondary air pipe of the boiler air pre-heater for heating the low-temperature flue gas at the outlet of the GGH, and a hot secondary air regulating valve is installed on the hot secondary air pipe of the boiler air pre- A certain amount of hot secondary air is used to heat the low-temperature flue gas at the outlet of the absorption tower of the desulfurization unit to the required temperature. The operation process is as follows: the flue gas enters the large-gap flat GGH heat exchange element 3 after being dedusted by the dust collector 1 and is sent to the absorption tower 2, and the low-temperature flue gas desulfurized by the absorption tower 2 passes through the large-gap flat GGH heat exchange element 3 an...

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Abstract

The invention relates to a heating process of low-temperature flue gas with wetting flue gas desulphurization; an adsorption tower is directly connected with a chimney by a pipeline, and a hot secondary air pipe of a boiler air preheater, which is used for heating low-temperature flue gas at the outlet of an absorption tower, is connected on the pipeline for connecting the absorption tower and the chimney. In the invention, GGH (Gas GasHeater) is removed to thoroughly solve the problems that the heating effect is poor, the desulphurization performance is unstable, availability factor is low and the operation is dis-economic owning to GGH scaling and blocking, so as to reduce the service-power consumption rate of a desulphurization system; in addition, the invention has flexible adjustability, can heat the low-temperature flue gas at the outlet of the absorption tower of the desulphurization device to the temperature needed by safe discharge by pumping secondary wind along with the change of the boiler load; the desulphurization flue gas temperature can be heated to above dew-point temperature of the glue gas according to the safety of the chimney, so as to avoid special anticorrosion renovation to the chimney; furthermore, the desulphurized flue gas lifting and diffusion effect is improved.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization engineering in thermal power plants, and in particular relates to a low-temperature flue gas heating process after wet flue gas desulfurization. Background technique [0002] At present, most of the wet flue gas desulfurization devices in thermal power plants use GGH to heat the low-temperature flue gas after desulfurization to weaken the condensation of flue gas in the chimney and improve the effect of flue gas lifting and emission. From the perspective of operation effect, many devices have problems such as poor heating effect, unstable desulfurization performance, low availability rate and uneconomical operation due to GGH fouling and blockage. Many power plants have been troubled by GGH fouling and blockage for a long time, and they frequently shut down the desulfurization device for flushing. During this period, the desulfurization device was forced to shut down. It has caus...

Claims

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Application Information

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IPC IPC(8): F23J15/08
Inventor 牛拥军丹慧杰何育东赵彩虹雷鸣潘栋李兴华
Owner XIAN THERMAL POWER RES INST CO LTD
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