Device and process for removing hydrogen sulfide contained in industrial gas

Abstract

The invention belongs to the technical field of removal of hydrogen sulfide contained in gases, and particularly relates to a device and a process for removing the hydrogen sulfide contained in an industrial gas, aiming at providing high-efficiency rotating packed bed equipment applicable to occasions with large flux and high treatment requirements. The device comprises a rotating packed bed and a regeneration system, wherein the liquid inlet pipe of the rotating packed bed is connected with a barren solution tank through a barren solution pump, and an air inlet pipe is connected with a sulfurous gas; the liquid discharge pipe of the rotating packed bed is connected with a pregnant solution tank, and an air outlet pipe is connected with a demister. The process comprises the following steps: preparing a desulfurizing solution; respectively introducing the desulfurizing solution and the gas which contains the hydrogen sulfide into the rotating packed bed; introducing a liquid discharged from the rotating packed bed into the regeneration system for recovery. The device and the process which are disclosed by the invention have the advantages of good desulfurization effect, small occupied area, high mass transfer efficiency, small liquid circulating amount, small gas-phase pressure drop, low operation cost and convenience for start and stop. According to the invention, the integral process system can be stable within a few minutes.

Description

technical field [0001] The invention belongs to the technical field of hydrogen sulfide removal in gas, and in particular relates to a device and a process for removing hydrogen sulfide in industrial gas. Background technique [0002] In the prior art, high-gravity devices have been used for gas desulfurization, such as Chinese patent 200620023555.9, which discloses a device for removing hydrogen sulfide from industrial gases, but because the rotors of the rotating packed bed are integral The structure, that is, the filler in the rotor is driven by a single shaft to rotate. The first patent on the high-gravity rotating bed was proposed by the British Imperial Chemical Industries (ICI) in 1979, and the patent number was EP0002568. This rotor structure is basically continued. In 2001, Sandilya et al. found that the gas-phase mass transfer process in a rotating packed bed has a lower mass transfer coefficient than that in a packed tower. The transfer rate is very small, the g...

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Problems solved by technology

[0002] In the prior art, high-gravity devices have been used for gas desulfurization, such as Chinese patent 200620023555.9, which discloses a device for removing hydrogen sulfide from industrial gases, but because the rotors of the rotating packed bed are integral The structure, that is, the filler in the rotor is driven by a single shaft to rotate. The first patent on the high-gravity rotating bed was proposed by the British Imperial Chemical Industries (ICI) in 1979, and the patent number was EP0002568. Basically continue this rotor structure

In 2001, Sandilya et al. found that the gas-phase mass transfer process in a rotating packed bed has a lower mass transfer coefficient than that in a packed tower. The transfer rate is very small, the gas phase interface cannot be updated quickly, and the uneven distribution of the liquid phase in the packing will further reduce the mass transfer rate.

[0003] The research results show that: compared with the packed column, the liquid film mass transfer coefficient k L Increased by 2 to 8 times, the total volume mass transfer coefficient K of the liquid phase L The increase of a is more significant, reaching 1 to 2 orders of magnitude, which indicates that the supergravity effect has a significant strengthening effect on the gas-liquid mass transfer process controlled by the liquid film; it is also found that: the total volume mass transfer coefficient K of the gas phase G a also increases (but not as much as K L a), but the gas film mass transfer coefficient k G However, the change is very small, which shows that the effect of high gravity on the gas-liquid mass transfer process controlled by the gas film is not good. The main contribution to the increase of the total volume mass transfer coefficient of the gas phase is the use of fillers with a high specific surface area a due to

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