阅读说明：本技术 一种沼气的生物精脱硫处理系统 (Biological fine desulfurization treatment system for biogas ) 是由 蒋建平 于 2020-04-30 设计创作，主要内容包括：一种沼气的生物精脱硫处理系统,包括脱硫洗涤塔、再生反应器、硫沉淀器,精炼洗涤塔和精炼洗涤液循环罐；所述脱硫洗涤塔的排气管道与精炼洗涤塔连通,脱硫洗涤塔的入液管道与再生反应器连通,脱硫洗涤塔的富液出料管道与再生反应器连通；所述再生反应器的硫出料管道与硫沉淀器连通,所述硫沉淀器的排液管道与再生反应器连通；所述精炼洗涤液循环罐分别与精炼洗涤塔、再生反应器连通。本发明实现了高效、低成本脱硫的的同时达到进一步提纯效果,利用嗜盐脱硫杆菌处理失效的洗涤液参与循环,用更好的物化条件提升洗涤液进一步去除硫化氢的净化能力。(A biological fine desulfurization treatment system for biogas comprises a desulfurization washing tower, a regeneration reactor, a sulfur precipitator, a refining washing tower and a refining washing liquid circulating tank; an exhaust pipeline of the desulfurization washing tower is communicated with the refining washing tower, a liquid inlet pipeline of the desulfurization washing tower is communicated with the regeneration reactor, and a rich liquid outlet pipeline of the desulfurization washing tower is communicated with the regeneration reactor; a sulfur discharge pipeline of the regeneration reactor is communicated with a sulfur precipitator, and a liquid discharge pipeline of the sulfur precipitator is communicated with the regeneration reactor; and the refining washing liquid circulating tank is respectively communicated with the refining washing tower and the regeneration reactor. The invention realizes high-efficiency and low-cost desulfurization and simultaneously achieves the effect of further purification, utilizes the halophilic desulfurization bacillus to treat ineffective washing liquid to participate in circulation, and improves the purification capacity of the washing liquid for further removing hydrogen sulfide by using better physicochemical conditions.)

1. The utility model provides a biological smart desulfurization processing system of marsh gas, includes desulfurization scrubbing tower, regeneration reactor, sulphur precipitator which characterized in that still includes: a refining washing tower and a refining washing liquid circulating tank;

an exhaust pipeline of the desulfurization washing tower is communicated with the refining washing tower, a liquid inlet pipeline of the desulfurization washing tower is communicated with the regeneration reactor, and a rich liquid outlet pipeline of the desulfurization washing tower is communicated with the regeneration reactor;

a sulfur discharge pipeline of the regeneration reactor is communicated with a sulfur precipitator, and a liquid discharge pipeline of the sulfur precipitator is communicated with the regeneration reactor;

and the refining washing liquid circulating tank is respectively communicated with the refining washing tower and the regeneration reactor.

2. The system for biological fine desulfurization treatment of biogas according to claim 1, wherein the desulfurization scrubber is provided with a biogas inlet pipe.

3. The system for biological fine desulfurization treatment of biogas according to claim 1, wherein the refining scrubber is provided with a refined gas exhaust duct.

4. The system for biological fine desulfurization treatment of biogas according to claim 1, wherein the refining washing liquid circulation tank is provided with a make-up liquid inlet.

5. The system for biological fine desulfurization treatment of biogas according to claim 1, wherein said refining washing liquid circulation tank and said regeneration reactor are provided with air inlets for supplying electron.

6. The treatment method of the biological fine desulphurization treatment system for the biogas according to any one of claims 1-5, characterized by comprising the following steps:

s1, spraying alkaline biological washing liquid on the top of the desulfurization washing tower, introducing biogas containing sulfur compounds into a biogas inlet pipeline of the desulfurization washing tower, enabling the biogas to be in countercurrent upward contact with the biological washing liquid from the bottom of the desulfurization washing tower, absorbing hydrogen sulfide in the biogas by the biological washing liquid, enabling a sulfide-containing pregnant solution to flow into a regeneration reactor through a pregnant solution discharge pipeline after treatment is finished, isolating air in a liquid material transmission process, enabling the treated biogas to enter a refining washing tower through an exhaust pipeline of the desulfurization washing tower, and isolating air in a gas transmission process;

s2, the biogas entering the refining washing tower is further purified and desulfurized through the treatment of the biological washing liquid of the refining washing liquid circulating tank, and the obtained refined biogas is discharged through a refined gas exhaust pipeline;

s3, the regeneration reactor carries out biological treatment on the pregnant solution under the condition that the electron air inlet is supplied with air oxygen to provide electrons, sulfur compounds in the pregnant solution are reduced to sulfur simple substances, so that the washing solution has the effect of washing and absorbing hydrogen sulfide again, the sulfur simple substances and part of biological washing solution enter the sulfur precipitator through the sulfur discharge pipeline of the regeneration reactor, the sulfur precipitator precipitates the sulfur simple substances and then carries out solid-liquid separation, the sulfur simple substances are separated and discharged from the sulfur discharge port of the sulfur precipitator, and the biological washing solution flows back to the regeneration reactor through the liquid discharge pipeline of the sulfur precipitator;

s4, adding supplementary water, alkali liquor and nutritive salt into a supplementary liquid inlet of a refined washing liquid circulating tank, enabling biological washing liquid in a regeneration reactor to flow into the refined washing liquid circulating tank through a first pipeline, enabling an electron supply air inlet of the refined washing liquid circulating tank to be filled with air oxygen to provide electrons, carrying out biological treatment on the pregnant solution of the refined washing and the supplementary biological washing liquid, reducing sulfur compounds in the mixed washing liquid into elemental sulfur, purifying and removing hydrogen sulfide in the gas, enabling the washing liquid to have the effect of washing and absorbing the hydrogen sulfide again, pumping the washing liquid into a refined washing tower through a second pipeline for treatment through a pump, enabling the washing liquid to flow into the refined washing liquid circulating tank through a third pipeline for backflow circulation to obtain alkaline-recovering biological washing liquid, and enabling residual liquid of the obtained alkaline-recovering biological washing liquid to flow back to the regeneration reactor through a fourth pipeline;

and S5, pumping the biological washing liquid recovered to be alkaline into the top of the desulfurization washing tower through a pump by the regeneration reactor for spraying, and recycling the biological washing liquid.

Technical Field

The invention relates to the technical field of methane desulfurization, in particular to a biological fine desulfurization treatment system for methane.

Background

Biological desulfurization is a new environment-friendly technology developed in recent years, is a specific application of biotechnology in the fields of environmental protection and renewable energy utilization, has the conditions of low cost, good desulfurization effect and no need of adding expensive chemical catalysts, high temperature and high pressure and the like, and is widely used in industry, agriculture, animal husbandry, urban kitchen waste treatment and garbage landfill treatment at present.

At present, there is a partial problem in the biological desulfurization technique that elemental sulfur is generated, and the electron source is provided by oxygen blown into air by air, but the oxygen supply process cannot avoid excessive oxidation to generate partial sulfuric acid H₂SO₄If the desulfurization is not controlled, the desulfurization is caused by SO₄The accumulation of roots increases and rapidly fails, which is reflected in the control data as a continuous increase in conductivity (salinity). If the salt tolerance of biological bacteria is exceeded, the desulfurization effect is lost, so that the oxidation value is restricted by controlling the potential in the regeneration process of the ineffective washing liquid, a potential map with the same sine wave is generated in the control process, and when the potential is low, a certain amount of hydrogen sulfide is left due to insufficient electron supply and is not treated completely.

Because the conductivity needs to be strictly controlled and the salt is restricted, the pH value and the alkali adding amount need to be controlled, the state of the washing liquid is limited, and the existing process cannot form perfect desulfurization conditions and desulfurization environment.

In addition, with the increasingly strict requirements of national environmental protection on atmospheric pollution, the treatment standard-reaching requirements of enterprises on biogas and other sulfur-containing gases are as follows: if the prepared natural gas reaches the index of the natural gas, the content of hydrogen sulfide: less than or equal to 10 mg/l; namely, the requirement is equal to or less than 7 ppm; the regenerated methane is also used as a raw material to be desulfurized and decarbonized to prepare natural gas (CNG project) for vehicles or enter pipeline fuel gas projects used by residents, and the index requirements on the content of the hydrogen sulfide are the same. The emission of sulfur-containing gas is also a stricter index requirement, and the existing biological desulfurization process is difficult to meet the requirement, so that other methods, such as solid chemical desulfurization series connection and the like, need to be added. But the service cycle of the solid chemical desulfurization is very short, and the solid chemical desulfurization can not reach the standard quickly. This is because solid desulfurization has numerous drawbacks: a is not efficient and is very easy to saturate; b high cost of replacing the desulfurizer, high labor intensity, dust and spontaneous combustion explosion danger in the replacement work, and bad working environment.

Therefore, it is an urgent problem to be solved by those skilled in the art to provide a biological fine desulfurization treatment system for biogas.

Disclosure of Invention

In view of the above, the present invention provides a biological fine desulfurization treatment system for biogas, which comprises: the desulfurization washing tower, the regeneration reactor and the sulfur precipitator are provided with the refining washing tower and the refining washing liquid circulating tank at the back, so that the gas is further purified while the high-efficiency and low-cost desulfurization effect is realized, air is not introduced into the methane, and the heat value of the methane is maintained.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides a biological smart desulfurization processing system of marsh gas, includes desulfurization scrubbing tower, regeneration reactor, sulphur precipitator which characterized in that still includes: a refining washing tower and a refining washing liquid circulating tank;

an exhaust pipeline of the desulfurization washing tower is communicated with the refining washing tower, a liquid inlet pipeline of the desulfurization washing tower is communicated with the regeneration reactor, and a rich liquid outlet pipeline of the desulfurization washing tower is communicated with the regeneration reactor;

a sulfur discharge pipeline of the regeneration reactor is communicated with a sulfur precipitator, and a liquid discharge pipeline of the sulfur precipitator is communicated with the regeneration reactor;

and the refining washing liquid circulating tank is respectively communicated with the refining washing tower and the regeneration reactor.

Preferably, the desulfurization scrubber is provided with a biogas inlet pipeline.

Preferably, the refinery scrubber is provided with a refinery gas vent line.

Preferably, the refining washing liquid circulating tank is provided with a make-up liquid inlet.

Preferably, the refinery wash liquor recycle tank and the regeneration reactor are both provided with an air inlet for supplying electrons.

A treatment method of a biological fine desulfurization treatment system for biogas comprises the following specific steps:

s1, spraying alkaline biological washing liquid on the top of the desulfurization washing tower, introducing biogas containing sulfur compounds into a biogas inlet pipeline of the desulfurization washing tower, enabling the biogas to be in countercurrent upward contact with the biological washing liquid from the bottom of the desulfurization washing tower, absorbing hydrogen sulfide in the biogas by the biological washing liquid, enabling a sulfide-containing pregnant solution to flow into a regeneration reactor through a pregnant solution discharge pipeline after treatment is finished, isolating air in a liquid material transmission process, enabling the treated biogas to enter a refining washing tower through an exhaust pipeline of the desulfurization washing tower, and isolating air in a gas transmission process;

s2, the biogas entering the refining washing tower is further purified and desulfurized through the treatment of the biological washing liquid of the refining washing liquid circulating tank, and the obtained refined biogas is discharged through a refined gas exhaust pipeline;

s3, the regeneration reactor carries out biological treatment on the pregnant solution under the condition that the electron air inlet is supplied with air oxygen to provide electrons, sulfur compounds in the pregnant solution are reduced to sulfur simple substances, so that the washing solution has the effect of washing and absorbing hydrogen sulfide again, the sulfur simple substances and part of biological washing solution enter the sulfur precipitator through the sulfur discharge pipeline of the regeneration reactor, the sulfur precipitator precipitates the sulfur simple substances and then carries out solid-liquid separation, the sulfur simple substances are separated and discharged from the sulfur discharge port of the sulfur precipitator, and the biological washing solution flows back to the regeneration reactor through the liquid discharge pipeline of the sulfur precipitator;

s4, adding supplementary water, alkali liquor and nutritive salt into a supplementary liquid inlet of a refined washing liquid circulating tank, enabling biological washing liquid in a regeneration reactor to flow into the refined washing liquid circulating tank through a first pipeline, enabling an electron supply air inlet of the refined washing liquid circulating tank to be filled with air oxygen to provide electrons, carrying out biological treatment on the pregnant solution of the refined washing and the supplementary biological washing liquid, reducing sulfur compounds in the mixed washing liquid into elemental sulfur, purifying and removing hydrogen sulfide in the gas, enabling the washing liquid to have the effect of washing and absorbing the hydrogen sulfide again, pumping the washing liquid into a refined washing tower through a second pipeline for treatment through a pump, enabling the washing liquid to flow into the refined washing liquid circulating tank through a third pipeline for backflow circulation to obtain alkaline-recovering biological washing liquid, and enabling residual liquid of the obtained alkaline-recovering biological washing liquid to flow back to the regeneration reactor through a fourth pipeline;

and S5, pumping the biological washing liquid recovered to be alkaline into the top of the desulfurization washing tower through a pump by the regeneration reactor for spraying, and recycling the biological washing liquid.

Preferably, the desulfobacterium in the system is a desulfobacterium halophilum which is self-propagating in a balanced manner during desulfation.

Preferably, the pH value of the alkaline biological washing solution is 8-9.5.

Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:

the invention provides a biological fine desulfurization treatment system for biogas, which is added to the original biological desulfurization process and belongs to a separation type biological desulfurization process, wherein exogenous gases such as air and the like are not introduced into the treated gas in the desulfurization process, the calorific value of the biogas is kept unchanged and is used for removing hydrogen sulfide, halophilic desulfurization bacillus is adopted, the desulfurization efficiency can be higher than 98.5%, and the desulfurization product is high-purity elemental sulfur and can be used for manufacturing sulfuric acid, chemical fertilizers and the like. The method can bear the maximum concentration of hydrogen sulfide, and the concentration of the hydrogen sulfide is within the range of 100-50000 ppm, so that the stable desulfurization treatment can be still ensured. The invention utilizes halophilic desulfobacterium to improve the purifying capacity of biological washing liquid for removing sulfide under better physicochemical conditions on the basis of the original biological desulfurization process, and purifies the gas again.

The water, alkali and nutritive salt added into the refined washing liquid circulating tank in full or partial supplementary amount raises the alkalinity, pH value, etc. of the biological washing liquid, and this can eliminate the loss of water, alkali and nutritive salt caused by the discharge of sulfur and other matter in biological treatment and makes the refined washing liquid updated fast without considering the negative effect of sulfate radical and salinity caused by oxidation. And as the total alkali water consumption is not increased, the reflux of the polysulfate used as the biocatalyst is more beneficial to the treatment effect of the reactor. In the engineering example, the following are presented: the original methane hydrogen sulfide concentration is 10000PPm, 15000PPm, 20000PPm, 22000PPm and the like, and the biological fine desulfurization treatment system of the methane can reach the single-digit PPm-grade biological gas purification index requirement.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a biological fine desulfurization treatment system for biogas of the present invention;

in the figure, 1-a desulfurization washing tower, 2-a regeneration reactor, 3-a sulfur precipitator, 4-a refining washing tower, 5-a refining washing liquid circulating tank, 6-an exhaust pipeline, 7-a liquid inlet pipeline, 8-a pregnant solution discharge pipeline, 9-a sulfur discharge pipeline, 10-a liquid discharge pipeline of the sulfur precipitator, 11-a biogas inlet pipeline, 12-a refined gas exhaust pipeline, 13-a supplementary liquid inlet, 14-an electron supply air inlet, 15-a first pipeline, 16-a second pipeline, 17-a third pipeline, 18-a fourth pipeline and 19-a sulfur discharge port.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

The embodiment of the invention discloses a biological fine desulfurization treatment system for biogas, which adopts the following technical scheme:

the utility model provides a biological smart desulfurization processing system of marsh gas, includes desulfurization scrubbing tower 1, regeneration reactor 2, sulphur precipitator 3, its characterized in that still includes: a refining washing tower 4 and a refining washing liquid circulating tank 5;

an exhaust pipeline 6 of the desulfurization washing tower 1 is communicated with the refining washing tower 4, a liquid inlet pipeline 7 of the desulfurization washing tower 1 is communicated with the regeneration reactor 2, and a rich liquid outlet pipeline 8 of the desulfurization washing tower 1 is communicated with the regeneration reactor 2;

a sulfur discharge pipeline 9 of the regeneration reactor 2 is communicated with the sulfur precipitator 3, and a liquid discharge pipeline 10 of the sulfur precipitator is communicated with the regeneration reactor 2;

and the refining washing liquid circulating tank 5 is respectively communicated with the refining washing tower 4 and the regeneration reactor 2.

In order to further optimize the technical scheme, the desulfurization scrubber 1 is provided with a biogas inlet pipeline 11.

In order to further optimize the above technical solution, the refinery scrubber 4 is provided with a refined gas exhaust duct 12.

In order to further optimize the technical scheme, the refining washing liquid circulating tank 5 is provided with a supplementary liquid inlet 13.

In order to further optimize the above solution, the refining wash liquor circulation tank 5 and the regeneration reactor 2 are provided with a supply electron air inlet 14.

A treatment method of a biological fine desulfurization treatment system for biogas comprises the following specific steps:

s1, spraying alkaline biological washing liquid on the top of the desulfurization washing tower 1, introducing biogas containing sulfur compounds into a biogas inlet pipeline 11 of the desulfurization washing tower 1, enabling the biogas to be in countercurrent upward contact with the biological washing liquid from the bottom of the desulfurization washing tower 1, absorbing hydrogen sulfide in the biogas by the biological washing liquid, enabling a sulfide-containing pregnant solution to flow into the regeneration reactor 2 through a pregnant solution discharge pipeline 8 after treatment is finished, isolating air in the liquid-material transmission process, enabling the treated biogas to enter a refining washing tower 4 through an exhaust pipeline 6 of the desulfurization washing tower 1, and isolating air in the gas transmission process;

s2, the biogas entering the refining washing tower 4 is further purified and desulfurized through the treatment of the biological washing liquid of the refining washing liquid circulating tank 5, and the obtained refined biogas is discharged through a refined gas exhaust pipeline 12;

s3, the regeneration reactor 2 carries out biological treatment on the pregnant solution under the condition that the air inlet 14-2 for supplying the electron supplies the air oxygen to provide the electron, the sulfur compound in the pregnant solution is reduced to sulfur simple substance, so that the cleaning solution has the effect of cleaning and absorbing the hydrogen sulfide again, the sulfur simple substance and part of the biological cleaning solution enter the sulfur precipitator 3 through the sulfur discharge pipeline 9 of the regeneration reactor, the sulfur simple substance is precipitated by the sulfur precipitator 3 and then is separated from the solid and liquid, the sulfur simple substance is separated and discharged from the sulfur discharge port 19 of the sulfur precipitator, and the biological cleaning solution flows back to the regeneration reactor 2 through the liquid discharge pipeline 10 of the sulfur precipitator;

s4, adding supplementary water, alkali liquor and nutritive salt into a supplementary liquid inlet 13 of the refined washing liquid circulating tank 5, enabling the biological washing liquid in the regeneration reactor 2 to flow into the refined washing liquid circulating tank 5 through a first pipeline 15, the electron supply air inlet 14-1 of the refining wash liquor circulation tank 5 is charged with air oxygen to supply electrons, carrying out biological treatment of the desulfobacterium on the pregnant solution of the refining washing and the supplemented biological washing solution, reducing sulfur compounds in the mixed washing solution into elemental sulfur, purifying and removing hydrogen sulfide in the gas to ensure that the washing solution has the effect of washing and absorbing the hydrogen sulfide again, passing through a pump, pumping the obtained product into a refining washing tower 4 through a second pipeline 16 for treatment, flowing into a refining washing liquid circulating tank 5 through a third pipeline 17 for backflow circulation to obtain a biological washing liquid with recovered alkalinity, and allowing a residual liquid of the obtained biological washing liquid with recovered alkalinity to flow back to the regeneration reactor 2 through a fourth pipeline 18;

s5, pumping the biological washing liquid recovered to be alkaline into the top of the desulfurization washing tower 1 through a pump by the regeneration reactor 2 for spraying, and recycling the biological washing liquid.

In order to further optimize the technical scheme, the desulfobacterium in the system is the halophilic desulfobacterium which is propagated and balanced in the desulfurating process.

In order to further optimize the technical scheme, the pH value of the alkaline biological washing solution is 8-9.5.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles disclosed herein.