Wet-process ferric salt membrane-electrolysis regenerated biogas desulfurization method and device thereof

Abstract

The invention relates to a desulfurization method and a desulfurization device, and specifically relates to a wet-process ferric salt membrane-electrolysis regenerated biogas desulfurization method and device thereof. The wet-process ferric salt membrane-electrolysis regenerated biogas desulfurization device comprises an absorption tower, wherein a waste liquid outlet of the absorption tower is communicated with a water inlet of a separating device by a recycling tank; a water outlet of the separating device is connected with a water inlet of a diaphragm electrolytic cell by a buffer tank; and a water outlet of the diaphragm electrolytic cell is connected with the water inlet of the absorption tower by the liquid storage tank. Absorption liquid which absorbs hydrogen sulfide can be recycled after being treated by the separating device and the diaphragm electrolytic cell. The whole process can be normally operated without an extra heat source under a normal temperature condition, and products are elemental sulfur sludge as well as alkali and hydrogen gas which are produced by an electrolysis regeneration process, and are free of secondary pollution. The device not only can be manufactured into a large device, but also can be manufactured into a small device, so that no matter large-scale biogas energy resource engineering or small-scale biogas energy resource engineering can adopt the desulfurization way.

Description

technical field [0001] The invention relates to a desulfurization method and device, in particular to a wet iron salt membrane electrolysis regeneration biogas desulfurization method and device. Background technique [0002] Biogas produced by anaerobic fermentation of organic waste, high-concentration organic industrial wastewater and biomass solid waste must be desulfurized before it can be used as energy. [0003] At present, the more mature desulfurization processes are as follows: [0004] Biological desulfurization, that is, THIOPAQ desulfurization technology, utilizes the metabolic activities of sulfur bacteria to convert H in biogas 2 A desulfurization technology that realizes biogas purification by converting S into simple substances. From the relevant technical data of engineering application, biological desulfurization H 2 The removal rate of S can reach 90%, and the conversion rate of sulfide into simple substance can reach 85%. However, this desulfurization ...

AI Technical Summary

Problems solved by technology

However, this desulfurization technology has the following disadvantages: the temperature requirements are relatively high, because the optimal temperature range of sulfur bacteria is 25-40 ° C, so in order to maintain the high efficiency of desulfurization, it is necessary to keep warm or run with heat

Using this desulfurization process requires power or purified biogas as a heat source to maintain the temperature required for the regeneration process, so the overall efficiency of this desulfurization process is not high

In addition, except for the first application of Bio-SR desulfurization process to waste gas desulfurization of barium chemical reagent plant, there are no related reports on its engineering application in the fields of natural gas desulfurization and biogas desulfurization

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