Wet catalyzed oxidation desulfuration method and device thereof

Abstract

The invention discloses a wet catalyzed oxidation desulfuration method and a device thereof. The method comprises the following steps: the sulfurous gas is reversely contacted with the desulfurized recycling liquid in a thionizer, the gas is discharged from the top of the thionizer after being removed hydrogen sulfide, the desulfurized rich solution is discharged from the bottom of the thionizer for oxidization regeneration and recycling; liquid sealing, oxidation reaction, sulphur bubble separation and clear solution cycling are carried out on the desulfurized rich solution in a solution cycling and regenerating groove. The special device comprises the thionizer and the solution cycling and regenerating groove which is provided with a device for finishing liquid sealing, oxidation reaction, and sulphur bubble separation. In the invention, a solution circulating pump is used for realizing the operating power of the whole system in the thionizer, and has the advantages of energy saving, environment protecting, being efficient and integrated, simple process flow and the like.

Description

technical field [0001] The invention relates to a coke oven gas desulfurization technology, in particular to a wet catalytic oxidation desulfurization method and a device thereof. Background technique [0002] At present, the existing coke oven gas desulfurization process usually adopts single-tower and double-tower wet catalytic oxidation desulfurization methods. Wet catalytic oxidation desulfurization method, in China, mainly has two types: two-tower type and one-tower type. The two-tower type also includes the one-tower-one-slot type. The so-called two-tower or one-tower-one-tank type means that the desulfurization system consists of a desulfurization absorption tower and a regeneration tower; or a desulfurization absorption tower and a regeneration tank. The circulation power of the system is supported by two solution pumps, and an air compressor is required for air supply. The so-called one-tower type refers to the superimposition of the absorption tower and the rege...

AI Technical Summary

Problems solved by technology

[0004] Disadvantages of the two-tower process: (1) Two solution pumps are used, and the power consumption is relatively large; (2) The regeneration tower is high, the power consumption of the regeneration solution pump is large, and the construction cost is high; (3) Two towers require two Tower foundation, footprint increased

(6) Regeneration exhaust gas is discharged from the top of the regeneration tower, which has a bad impact on the environment

(7) For the trough-type oxidation regeneration tank, although the height of the tower is reduced, the solution treatment time is short, especially the exhaust gas discharge point is low, which has a greater impact on the environment

[0006] Disadvantages of the single-tower process: (1) Due to the superposition of two devices and the support for the regeneration tank, the diameter of the absorption tower section in the lower section has to be enlarged, and the superficial gas velocity of the tower is smaller than the conventional one, so additional Large solution spray volume to maintain normal spray density

Infrastructure costs are high

(3) The total height of the two towers is inconvenient for picking and repairing

(4) Regeneration by spraying at the top of the tower requires the pump to have a sufficiently high residual pressure, so the power consumption is large

(5) Multiple towers are connected in series, and each tower replenishes catalyst and waste liquid separately, the utilization rate of the catalyst is small and the loss rate of the catalyst is large

(6) Although the hydrogen sulfide content of the gas after desulfurization can be less than 20mg / m3 in the single-tower process, this is mainly due to the use of large circulation volume, large absorption area, large liquid-gas ratio, and other technological measures. Unable to distribute and utilize oxygen reasonably

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