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High humidity sulfur oxide tail gas treatment method and device

A technology of sulfur oxides and high humidity, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems that the flue gas temperature cannot be effectively reduced and affects the desulfurization effect, so as to prevent ammonia escape and aerosol, and is widely used Applicability, the effect of reducing absolute humidity

Pending Publication Date: 2018-05-08
JIANGSU KEHANG ENVIRONMENT ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for other tail gases containing sulfur oxides with high absolute humidity, due to the small amount of water that can be evaporated into the tail gas in the cooling spray liquid, the temperature of the flue gas cannot be effectively reduced after the cooling spray, and a large amount of ammonia escape and gas will be generated in the absorption area. Sol, affect the desulfurization effect

Method used

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  • High humidity sulfur oxide tail gas treatment method and device

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Effect test

Embodiment 1

[0051] Total exhaust gas: 123000Nm 3 / h, flue gas temperature 145°C, absolute humidity 28%, flue gas sulfur oxide content 20000mg / Nm 3 , pressure 110kPa; desulfurizer is liquid ammonia, concentration 99.6%.

[0052] Process flow and equipment: The flue gas is blown into the normal temperature air by the blower, and the absolute humidity drops to 16%. It enters the cooling area of ​​the absorption tower, and is sprayed with ammonium sulfate solution to cool down. The temperature of the flue gas drops to 57°C, and the flue gas passes through the absorption area, After washing the purification area, it is discharged from the chimney after passing through the clean flue.

[0053] The concentration of sulfur dioxide in the exhaust gas is 23mg / Nm 3 , the particle concentration is 3.23mg / Nm 3 .

Embodiment 2

[0055] Total exhaust gas: 264700Nm 3 / h, flue gas temperature 162°C, absolute humidity 31.2%, flue gas sulfur oxide content 5800mg / Nm3, pressure 2000Pa; desulfurizer is ammonia water, concentration 15%.

[0056] Technological process and equipment: The flue gas first enters the adsorption device equipped with calcium chloride, the absolute humidity drops to 10%, enters the cooling zone of the absorption tower, and is sprayed with ammonium sulfate solution to cool down, the flue gas temperature drops to 51°C, and the flue gas is sequentially After passing through the absorption area and water washing purification area, it is discharged from the chimney after passing through the clean flue.

[0057] The concentration of sulfur dioxide in the exhaust gas is 15mg / Nm 3 , the particle concentration is 2.62mg / Nm 3 .

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Abstract

The invention discloses a high humidity sulfur oxide tail gas treatment method and device. The content of water in tail gas is reduced by mixing air or other gases with the tail gas through a fan or directly contacting with the tail gas through an adsorbent, so that the purpose of reducing the absolute humidity of the tail gas is reached; the temperature of the tail gas is sufficiently reduced when the tail gas passes a cooling device, so that ammonia escape and aerosol caused by high temperature of glue gas entering a desulfurizing tower absorption region are avoided. Ammonium sulfite is taken as an absorbent, ammonia and oxidation air respectively react with the ammonium sulfite and absorption liquid thereof, so that sulfur oxide in the tail gas is sufficiently absorbed through multilayer spraying and washing; finally fog drips and particulate matter in the tail gas are removed through a washing device. The device solves the problem that ammonium sulfite in the absorption region is easy to decompose when an ammonia desulfurization process is adopted for high humidity sulfur oxide tail gas, and has high practicability and wide applicability.

Description

technical field [0001] The invention relates to a tail gas treatment method and device, in particular to a high-humidity sulfur oxide tail gas treatment method and device. Background technique [0002] The ammonia desulfurization process is used for the removal of sulfur oxides in waste gas. Because the by-product is ammonium sulfate fertilizer, there is no waste gas and waste water discharge in the process of sulfur oxide removal, and its application is becoming more and more extensive. However, the current conventional ammonia desulfurization process has problems such as ammonia escape and large aerosols. In severe cases, the smoke plume is seriously tailed, and it is difficult to meet the environmental protection emission standards. [0003] An important factor causing ammonia escape and aerosol in the ammonia desulfurization device is that when the ammonium sulfite solution as the absorbing liquid contacts with the high-temperature flue gas, the ammonium sulfite decompos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/26B01D53/50B01D53/78
CPCB01D53/26B01D53/261B01D53/502B01D53/504B01D2251/608B01D2251/206B01D2259/124
Inventor 刘怀平刘季平耿桂淦祁成江季旭东王林刚
Owner JIANGSU KEHANG ENVIRONMENT ENG TECH
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