Method for desulfurization and sulfur recycling of tail gas produced in low-temperature methanol washing process
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A low-temperature methanol washing, process tail gas technology, applied in the field of environmental engineering, can solve the problems of unmentioned desulfurization agent regeneration, high investment and operating costs, inability to realize sulfur resources, etc., and achieves a high degree of automation, low safety risk, The effect of eliminating odor
Active Publication Date: 2021-07-16
KUNMING UNIV OF SCI & TECH
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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
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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 desulfurization and sulfur recycling of tail gas produced in a low-temperature methanol washing process. According to the method, organic sulfur in the sulfur-containing tail gas generated by the low-temperature methanol washing process is converted into H2S in a catalytic conversion manner; H2S is converted into elemental sulfur via a dry method and adsorbed on a desulfurizing agent; a regeneration process is carried out before the H2S penetration point is reached; and the desulfurizing agent is regenerated by adopting hot air, SO2 is oxidized into SO3 by adopting ozone under a micro-heating condition, the SO3 is enabled to enter a water spray tower for conversion into sulfuric acid, incompletely reacted ozone is decomposed into O2, and tail gas of the spray tower recycled as an air source. The method has both environmental benefits and economic benefits; the concentration of total sulfur in the desulfurized tail gas is less than 1 ppm, so peculiar smell around a factory is reduced or eliminated, the tail gas is discharged after reaching the standard, and secondary pollution is avoided; process flow is simple, the desulfurizing agent is thoroughly regenerated, waste heat recycling is realized, and sulfides in the coal gas are recycled into sulfuric acid; and the method is suitable for market and industrial popularization 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...
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