Desulphurization method of amine liquid with high removal rate of hydrogen sulfide and special equipment

Abstract

The invention discloses an amine liquid desulphurization method with high hydrogen sulphide removal rate and a special device. A regeneration tower is divided into an upper section and a lower section; by a third pipeline which is provided with a third pump and is added between the middle part of an absorption tower and the outlet of the upper section of the regeneration tower, and a fourth pipeline by which the outlet of the regeneration third pump and the inlet of the lower section of the regeneration tower are communicated with each other, two-step absorption and two-step regeneration are carried out by using solvents with different hydrogen sulphide contents, a small part of solvent with little hydrogen sulphide is used as absorbent of final-step, therefore, the solvent quantity which achieves the low content of hydrogen sulphide is little, thus the steam dosage is reduced, the reboiler steam is saved by about 30 percent, the operation energy consumption is greatly reduced and the desulphurization expense is reduced further; meanwhile, the content of the hydrogen sulphide in the processing gas purified by the invention can achieve less than 50ppmv; therefore, the absorption effect is good and the hydrogen sulphide removal rate is high.

Description

technical field [0001] The invention relates to an amine liquid desulfurization method, in particular to an amine liquid desulfurization method with a high hydrogen sulfide removal rate, and also relates to a special device for the amine liquid desulfurization method. Background technique [0002] At present, the technology of removing hydrogen sulfide contained in process gas by using amine liquid absorption method is widely used in desulfurization devices of petrochemical enterprises. The acid gas reacts to generate the corresponding amine salt, so that the process gas is purified; at the same time, the generated amine salt is easy to decompose at a higher temperature, so that the amine liquid can be regenerated and recycled. The existing amine liquid desulfurization method adopts one-stage absorption and one-stage regeneration process, and its device flow is shown in Figure 2. The process gas containing hydrogen sulfide enters from the bottom of the absorption tower 1a, a...

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Problems solved by technology

[0003] In the actual use process, the content of hydrogen sulfide in the finally purified gas of this process is still very high, reaching more than 400ppmv, that is, the removal rate of hydrogen sulfide is low. At the same time, the steam consumption of the reboiler of the amine liquid regeneration tower is large. High energy consumption, so it is necessary to develop a new amine liquid desulfurization technology

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