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Method for eliminating water mist from wet desulfurization flue gas

A wet desulfurization and flue gas technology, applied in coal-fired power plants, environmental protection, and smelting fields, can solve the problems of lower net flue gas discharge temperature, fine liquid droplet entrained emission, and impact on residents' lives, so as to achieve low operating power consumption and increase environmental protection benefit, the effect of increasing desulfurization efficiency

Inactive Publication Date: 2018-11-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after canceling the GGH, the discharge temperature of the net flue gas will drop, and a large number of fine liquid droplets will be entrained and discharged, and rain will form around the chimney. Great impact on residents' lives

Method used

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  • Method for eliminating water mist from wet desulfurization flue gas
  • Method for eliminating water mist from wet desulfurization flue gas
  • Method for eliminating water mist from wet desulfurization flue gas

Examples

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Embodiment 1

[0025] This embodiment is the implementation of the elimination method of wet flue gas water mist, such as figure 1 As shown, the treatment object is the desulfurized flue gas water mist using the limestone-gypsum wet desulfurization process (WFGD). Primary flue gas 1 without desulfurization treatment (sulfur content is about 450mg / Nm 3 ) enters from the flue gas inlet at the bottom of the desulfurization tower 2, and after wet desulfurization, the hot flue gas 3 (with a sulfur content of about 25 mg / Nm) is discharged from the upper flue gas outlet of the desulfurization tower 2 3 ,) into the heat exchanger 4, and exchange heat with the air 5 that enters countercurrently on the heat exchange surface of the heat exchanger 4. The heat exchange surface of the heat exchanger used for heat exchange is made of metal surface coated with acid corrosion resistant coating material, or organic polymer material, or metal titanium, which has good corrosion resistance. The cooled flue gas...

Embodiment 2

[0028] This embodiment is the implementation of the elimination method of wet flue gas water mist, such as figure 2 As shown, the treatment object is the desulfurized flue gas water mist using the limestone-gypsum wet desulfurization process (WFGD). The processing flow of this embodiment is substantially the same as that of Embodiment 1, the difference is that the primary flue gas 1 that has not been desulfurized is exchanged with the heated air 8 discharged from the heat exchanger 4 in the heat exchanger 12. heat, make the untreated first flue gas 1 heat exchange and heat up and then enter the desulfurization tower 2 to repeat the operation process in Example 1. The hot air 13 heated up again through heat exchange enters the flue gas dehydrator 7, and this embodiment 2 can realize the secondary utilization of the air.

[0029] Through the indirect heat exchange between flue gas and air after wet desulfurization through heat exchanger, the flue gas is cooled and cooled, and ...

Embodiment 3

[0031] This embodiment is the implementation of the elimination method of wet flue gas water mist, such as image 3 As shown, the treatment object is the desulfurized flue gas water mist using the limestone-gypsum wet desulfurization process (WFGD). The treatment process of this embodiment is substantially the same as that of Example 1, except that the hot flue gas 3 after desulfurization treatment is first processed by lye 14 to neutralize the residual desulfurization liquid before entering the heat exchanger 4 and exchanging heat with air 5 The dilute sulfuric acid then enters the heat exchanger 4 for heat exchange, and the treated lye 15 is discharged from the bottom of the heat exchanger 4 .

[0032] Desulfurized hot flue gas (sulfur content about 25mg / Nm 3 ), and then enter the heat exchanger for heat exchange after being treated with lye. The advantage of this embodiment is that the hot flue gas is firstly treated with lye, which can neutralize the residual dilute sulfu...

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Abstract

The invention relates to a method for eliminating water mist from wet desulfurization flue gas. The method comprises the following processes: firstly cooling flue gas at a gas outlet of a wet desulfurization tower by virtue of indirect-contact heat exchange with air through the heat exchanging surface of a heat exchanger; firstly discharging condensed water from the flue gas cooled by virtue of the indirect-contact heat exchange, then mixing with hot air heated in the heat exchanging process and then discharging into the atmosphere from a chimney. The flue gas treated by the desulfurization tower indirectly contacts the air on the heat exchanging surface of the heat exchanger for heat exchange so as to cool the treated flue gas, so that a white smoke phenomenon formed by direct discharge of the high-temperature flue gas is prevented; in addition, before the heat exchange, residual sulfur which is not completely treated is absorbed by alkali liquid, so that mixed gas finally dischargedafter mixing with the air is more pure, and thus the environmental protection benefits are increased. The method has the characteristics of low investment cost, low running power consumption, simpleness and high efficiency; by the method, an effective technical guarantee is provided for removing the water mist from the wet desulfurization flue gas in the field of smelting and coal-fired power plants and the like and achieving energy saving, emission reduction and efficiency enhancement.

Description

technical field [0001] The invention relates to a method for eliminating wet desulfurization flue gas water mist, especially after wet desulfurization, the flue gas at the gas outlet of the wet desulfurization tower is cooled by indirect heat exchange with the air, and the products are mixed and discharged from the chimney. Both the flue gas and water mist have a good removal effect, and the flue gas and water mist after desulfurization can be eliminated quickly and efficiently. It is suitable for smelting, coal-fired power plants and environmental protection fields. Background technique [0002] In the fields of smelting and coal-fired power plants, limestone-gypsum wet desulfurization process (WFGD) is mostly used for desulfurization projects, and most wet desulfurization towers are equipped with net flue gas reheaters. About 90% of the flue gas reheaters use the rotary regenerative raw flue gas / clean flue gas heat exchanger (GGH). It can be used to heat the clean flue ga...

Claims

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Application Information

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IPC IPC(8): B01D53/26B01D53/50B01D53/80
CPCB01D53/26B01D53/265B01D53/504B01D2258/0283
Inventor 张书廷刘闯程笑
Owner TIANJIN UNIV