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A method for tail gas desulfurization and sulfur resource utilization of low-temperature methanol washing process

A technology of low-temperature methanol washing and process tail gas, which is applied in the field of environmental engineering, can solve the problems of unmentioned desulfurization agent regeneration, failure to realize sulfur resource utilization, high investment and operation costs, etc., achieve high degree of automation, eliminate odor, and safety risks low effect

Active Publication Date: 2022-05-17
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it realizes H 2 S removal, but the investment and operation costs of the zinc oxide desulfurization system are high, and zinc oxide cannot remove the organic sulfur in the tail gas, and a large amount of SO is still produced after being discharged into the flare system for combustion 2 ; In addition, the invention does not mention the regeneration of the desulfurizer, and the resource utilization of sulfur cannot be realized

Method used

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  • A method for tail gas desulfurization and sulfur resource utilization of low-temperature methanol washing process

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Effect test

Embodiment 1

[0049] Embodiment 1: as figure 1 As shown, the method of tail gas desulfurization and sulfur resource utilization in this low-temperature methanol washing process is as follows:

[0050] A low temperature methanol washing system H 2 Exhaust gas at the outlet of the S concentration tower, with an air volume of 50,000m 3 / h, temperature 15°C; main component is CO 2 87%, CO 0.7%, N 2 9%, CH 4 Accounting for 1.3%, C 2 h 6 0.8%, methanol 0.2%, water content about 30g / m 3 . The sulfide in the exhaust gas is mainly H 2 S and COS, the concentrations are 30ppm and 150ppm, the rest are like CS 2 The total concentration of organic sulfur is less than 1mg / m 3 ;

[0051] (1) Organic sulfur conversion: H 2 The tail gas at the outlet of the S concentration tower first enters the organic sulfur conversion tower 1, and the reaction space velocity is 3000h -1 , under the condition of 80 ℃, using Danish Topsoe CKA catalyst, COS undergoes the following hydrolysis reaction:

[0052] ...

Embodiment 2

[0059] Embodiment 2: as figure 1 As shown, the method of tail gas desulfurization and sulfur resource utilization in this low-temperature methanol washing process is as follows:

[0060] A low temperature methanol washing system CO 2 Tail gas at the outlet of the flash tower, with an air volume of 20,000m 3 / h, temperature 20℃; main component is CO 2 95%, CO 0.6%, N 2 0.15%, CH 4 Accounting for 2%, C 2 h 6 1.3%, methanol 0.2%, water content about 35g / m 3 . The sulfide in the exhaust gas is mainly H 2 S and COS, the concentrations are 10ppm and 35ppm, the rest are like CS 2 The total concentration of organic sulfur is less than 1mg / m 3 ;

[0061] (1) Organic sulfur conversion: CO 2 The tail gas at the outlet of the flash tower first enters the organic sulfur conversion tower 1, and the reaction space velocity is 6000h -1 , under the condition of 60 ℃, using T504 catalyst of Hubei Institute of Chemistry, COS undergoes the following hydrolysis reaction:

[0062] COS...

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Abstract

The invention discloses a method for tail gas desulfurization and sulfur resource utilization of a low-temperature methanol washing process. The method converts organic sulfur in the sulfur-containing tail gas produced by the low-temperature methanol washing process into H through catalytic conversion. 2 S; by dry method H 2 S is converted into sulfur element and adsorbed on the desulfurizer; when reaching H 2 Cut into the regeneration process before the S breakthrough point; use hot air to regenerate the desulfurizer, and use ozone to desulfurize SO under slightly hot conditions. 2 Oxidation to SO 3 , and enter the water spray tower to be converted into sulfuric acid, and the incompletely reacted ozone is decomposed into O 2 , The tail gas from the spray tower is recycled as an air source. The invention has both environmental benefits and economic benefits; the total sulfur concentration in the tail gas after desulfurization is less than 1ppm, which reduces or eliminates the peculiar smell around the factory area, makes the tail gas discharge up to the standard, and does not produce secondary pollution; the process flow is simple, and the desulfurizer regeneration is thorough, realizing The waste heat is reused, and the sulfide in the gas is recycled into sulfuric acid; it is suitable for market and industrial promotion and application.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for desulfurizing tail gas of a low-temperature methanol washing process and recycling sulfur. Background technique [0002] The low-temperature methanol washing process is a gas purification technology jointly developed by Linde and Lurgi in the 1950s. This technology uses cold methanol as the absorption solvent, and uses methanol to absorb H at low temperature. 2 S, organic sulfur, CO 2 , cyanide, etc. have great solubility, while for CH 4 , CO, N 2 、H 2 Excellent characteristics of small solubility, remove acid gas in raw material gas. The low-temperature methanol washing process technology is mature, which can remove sulfide and CO in the gas 2 Segmented and selective removal in the same tower is widely used in industrial processes such as coal gasification to synthesize ammonia, synthesize methanol, prepare city gas, and produce h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/48B01D53/52B01D53/75B01D53/86B01D53/96C01B17/74
CPCB01D53/8603B01D53/8606B01D53/8612B01D53/869B01D53/96C01B17/74B01D2257/306B01D2257/308Y02P20/129
Inventor 王学谦李翔王郎郎吴优袁礼
Owner KUNMING UNIV OF SCI & TECH
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