System and method for electrochemical desulfurization of organic solid waste anaerobic fermentation biogas

An anaerobic fermentation, organic solid waste technology, applied in the field of biogas electrochemical desulfurization system, can solve the problems of incomplete solution absorption, secondary pollution, complex process, etc., to achieve long-term recycling, avoid work interruption, and efficient reaction stable effect

Pending Publication Date: 2021-03-19
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the dry desulfurization process is simple and produces no waste water, the desulfurization efficiency of the equipment is relatively low, and the packing needs to be replaced regularly, which is more suitable for low-flow and low-concentration biogas treatment
Wet desulfurization has high efficiency and can obtain high-purity elemental sulfur by-products, but the process is complicated, the solution is not absorbed thoroughly, and secondary pollution is easy to occur
Biological desulfurization has low energy consumption, high efficiency and low pollution, but the operating conditions of biological desulfurization process are difficult to control
In addition, the patent number is: CN201510605467.3, and the patent name is a method for microbial electrochemical in-situ biogas desulfurization, which uses microbial electrodes to achieve in-situ biogas desulfurization and methane purification, but the stability of microbial electrodes is poor, and hydrogen sulfide will generate sulfate. Sulfur is difficult to recycle directly

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  • System and method for electrochemical desulfurization of organic solid waste anaerobic fermentation biogas

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Effect test

Embodiment 1

[0040] Example 1: A system for electrochemical desulfurization of biogas by anaerobic fermentation of organic solid waste, including an absorption tank 4 and an electrochemical reaction tank 5; the electrochemical reaction tank 5 is an anode chamber I13 and a cathode chamber in sequence from left to right 15 and the anode chamber II 16, including the proton exchange membrane 18 between the anode I12, the cathode 14, the anode II17, the anode chamber I13, the cathode chamber 15 and the anode chamber II16 respectively; the absorption pool 4 and the bottom of the anode chamber II16 and the top are respectively provided with air inlet a 2, air inlet b 3, air outlet a 10 and air outlet b 19, and the biogas is divided into two paths from the total air inlet 1 into the absorption pool 4 and the electrochemical reaction pool 5, respectively After desulfurization by reaction, the biogas is collected and utilized from the top general gas outlet 21. The invention can realize the recovery...

Embodiment 2

[0044] Embodiment 2: A method for electrochemical desulfurization of biogas by anaerobic fermentation of organic solid waste, comprising the following steps:

[0045] (1) After anaerobic fermentation of organic solid waste, the biogas is divided into two paths a and b to enter the absorption pool 4 and the anode chamber II 16 of the electrochemical reaction pool respectively, and the biogas volume of the two paths is controlled by valve a 24 , valve b 25 and gas flow meter 26 1:1;

[0046] (2) One path of biogas enters from the biogas inlet a2 at the left bottom of the absorption pond, and under acidic conditions, it is mixed with the absorption liquid in the pond with 6 5mol / L FeCl 3 Solution reaction, H 2 S is reduced to simple sulfur. The biogas that has been absorbed once escapes from the upper liquid surface of the absorption liquid 6, and reacts with the absorption liquid spilled from the sprinkler 8 in the spray area 7 for secondary absorption, and the treated biogas ...

Embodiment 3

[0051] Embodiment 3: When the absorption pool 4 breaks down, the valve a 24 is closed, the valve b 25 is opened, and the biogas only enters into the anode chamber II 16 of the electrochemical reaction pool.

[0052] The biogas enters from the biogas inlet b3 at the bottom of the anode chamber II16. The solution in the anode chamber II is 3mol / L KI and 1mol / L KOH solution. After the anode II17 is connected to the cathode 14 circuit, under alkaline conditions, I - Electron loss is oxidized to IO 3 - , IO 3 - with H 2 S reacts to generate elemental sulfur, which is deposited into the lower collection hopper, and elemental sulfur can be collected through the sulfur discharge pipe b 20. H produced at the anode + Enter the cathode chamber 15 through the proton exchange membrane 18 and be reduced to H 2 , through H 2 The air outlet 23 is discharged.

[0053] The principle of the electrochemical reaction cell 3 of this embodiment is as follows:

[0054] Cathode: 2H + +2e - ...

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Abstract

The invention discloses a system and a method for electrochemical desulfurization of organic solid waste anaerobic fermentation biogas. The system comprises an absorption tank, a cathode chamber of anelectrochemical reaction tank, anode chambers I and II, a proton exchange membrane, a cathode, anodes I and II and an external circuit. Synchronous desulfurization is realized through reaction of hydrogen sulfide and oxidation-state absorption liquid of the absorption tank and electrochemical reaction of the anode chamber II, generated elemental sulfur is recycled, and meanwhile, the reduced absorption liquid can be regenerated and circulated through the anode chamber I, so that the biogas desulfurization efficiency is improved. Independent absorption desulfurization or electrochemical desulfurization can be provided by controlling the gas amount, equipment failure and work interruption are avoided, and the continuity of desulfurization is guaranteed. According to the organic solid wasteanaerobic fermentation biogas electrochemical desulfurization system, solution regeneration and elemental sulfur recovery are achieved through electrochemistry, and the system is flexible and easy tooperate, efficient, stable, environmentally friendly and free of secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of biogas desulfurization by anaerobic fermentation of organic solid waste, and in particular relates to a system and method for electrochemical desulfurization of biogas. Background technique [0002] At present, there are more and more examples of organic solid waste anaerobic fermentation projects with biogas as the target product. Common organic solid waste fermentation raw materials include: kitchen waste, kitchen waste, livestock manure and straw and other biomass, The biogas produced by waste anaerobic fermentation is a bioenergy other than fossil energy such as petroleum and coal, and it is also a renewable energy. It can effectively improve the energy structure and the contradiction between energy supply and demand, and play an important role in coping with global climate change and protecting the ecological environment. effect. [0003] Biogas produced by anaerobic fermentation of organic solid wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/52B01D53/75B01D53/78B01D53/79B01D53/96C12P5/02C12M1/107C01B17/05
CPCB01D53/52B01D53/75B01D53/78B01D53/79B01D53/965B01D2251/60B01D2258/05C01B17/05C12M21/04C12P5/023Y02E50/30
Inventor 刘杰王瑾瑾张小赛戴昕宫建瑞刘军祝浩
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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