CN103031172A - Layered biological-chemical combined biogas desulfurizing device - Google Patents
Layered biological-chemical combined biogas desulfurizing device Download PDFInfo
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- CN103031172A CN103031172A CN2013100032436A CN201310003243A CN103031172A CN 103031172 A CN103031172 A CN 103031172A CN 2013100032436 A CN2013100032436 A CN 2013100032436A CN 201310003243 A CN201310003243 A CN 201310003243A CN 103031172 A CN103031172 A CN 103031172A
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Abstract
The invention discloses a layered biological-chemical combined biogas desulfurizing device. The layered biological-chemical combined biogas desulfurizing device comprises a chemical absorbing layer, a biological desulfurizing layer and an alkali liquor circulating system; the chemical absorbing layer is provided with a biogas outlet pipe, a sprinkler head, a filler layer, a biogas inlet pipe, a biogas inlet pump and a biogas distributing plate, wherein an isolation plate, a settling tank, a biological aeration tank, an air aeration plate, an air inlet pump, an air inlet pipe, a mud discharging and sulfur pipe, an air outlet, a settling tank overflow opening and a dissolved oxygen probe are arranged on the biological desulfurizing layer, wherein the upper part of the isolation plate is inverted-conical; and the lower part of the isolation plate is conical; and an overflow pipe, a pH value probe, an alkali liquor circulating pipe, an alkali liquor circulating pump, a material supplementing pipe, a material supplementing pump, a liquid storage groove and a liquid storage groove overflow opening are arranged in the alkali liquor circulating system. According to the invention, chemical absorption and biological desulfurizing processes are organically combined, so that efficient desulfurizing can be achieved and the desulfurizing cost can be controlled; meanwhile, as the filler layer, the biological aeration tank and the settling tank are skillfully integrated, compact design, land conservation and convenient promotion are achieved.
Description
Technical field
The present invention relates to a kind of layer-stepping biological-chemical associating methane-desulfurizing device.
Background technology
Biogas is a kind of flammable mixed gas, contains CH
460%-70%, CO
225%-40% and a small amount of H
2S, NH
3, H
2With CO etc.H in the biogas
2S content is generally 1-11g/m
3H
2S is a kind of obnoxious flavour of severe toxicity, in air or under the condition of humidity, pipeline, burner and other hardware, instrument etc. is had strong corrosive nature.H
2The S burning generates SO
2, can directly affect human body health; SO
2Meet water and generate sulfuric acid, strong corrosive nature is then arranged.Therefore before biogas uses, must remove the H in the biogas
2S.The Environmental Protection in China standard code, during as the energy, H in the biogas
2S content must not surpass 20mg/m
3Because H in the biogas
2S concentration generally is higher than the regulation of Environmental Protection in China standard far away, so H
2Removing of S becomes requisite pre-treatment link in the biogas use procedure.
Existing biogas desulfurization method mainly contains chemical method, physico-chemical process and biological process etc.At present, generally adopt the desulfurization of dry oxidation iron on China's biogas engineering.At normal temperatures biogas is passed through the sweetening agent bed, make the H in the biogas
2S contacts with activated ferric oxide, generates Fe
2S
3, then allow and contain H
2The sweetening agent of S and contact with air, when having water, Fe
2S
3Change into ferric oxide and elemental sulfur.Although dry oxidation iron desulfurization technology comparative maturity, also be in following some shortcoming: running cost is higher, and the operation operation is loaded down with trivial details, and labour intensity is larger, and Sulfur capacity is lower, and discarded sweetening agent also can produce secondary pollution etc.
Biological desulphurization is both economical, pollution-free again, is the desirable substitute technology of dry desulfurization.So-called biological desulphurization utilizes the metabolism of microorganism that the hydrogen sulfide in the biogas is converted into elemental sulfur or vitriol exactly, and its reaction equation is:
2HS
- + 0
2→2S + 2OH
- （1）
2HS
- + 40
2→2SO
4 2- + 2H
+ （2）
According to operating method, can be divided into biological desulphurization and the outer biological desulfurization of anaerobic jar in the anaerobic jar.In last biological desulfurization process, the biological desulphurization process is placed in the anaerobic fermentation tank to be finished, and anaerobic fermentation tank has concurrently to be produced biogas and remove H
2The S dual-use function.But because H
2S has corrosive nature to the air chamber of fermentor tank, adds the elemental sulfur that generates in the tank and is difficult to remove, and this technique is not generally used.In the biological sulfur removal technology, the biological desulphurization process is placed on separately in the biological desulphurization tower carries out outside anaerobic jar.Its advantage has: do not need chemical catalyst, do not have secondary pollution, power consumption is few, and processing cost is low etc.
At present, biological desulphurization has obtained certain applying, and in European countries such as Germany, the methane bio-desulfurization tower has been widely used on the biogas fermentation engineering, but still exists many problems to need to be resolved hurrily.The common thionizer volume of single biological desulfurization process is larger, takes up an area morely, and the hydrogen sulfide removal rate is low, process operation is unstable wait not enough.In addition, sulfide can be vitriol by direct oxidation in the situation of thionizer oxygen excess, affects alkali liquid regeneration in the thionizer, thereby affects hydrogen sulfide absorption efficient, finally causes desulfuration efficiency low.For the problem that present methane bio-desulfurization exists, the present invention has designed a kind of layer-stepping biological-chemical associating methane-desulfurizing device, can realize the biogas high-efficiency desulfurization, controls simultaneously the biogas desulfurization cost.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of layer-stepping biological-chemical associating methane-desulfurizing device is provided.
Layer-stepping biological-chemical associating methane-desulfurizing device comprises chemical absorption layer, biological desulphurization layer and alkali liquor circulating system; The chemical absorption layer is provided with biogas escape pipe, spray header, packing layer, biogas inlet pipe, biogas air intake pump and biogas air-spreading disk from top to bottom successively, and wherein the biogas air intake pump links to each other with the biogas air-spreading disk by the biogas inlet pipe; The biological desulphurization layer comprises division board, settling tank, bio-aeration pool, the air aeration dish, the air inlet pump, air intake duct, the spoil disposal sulphur discharging pipeline, the air air outlet, the settling tank overflow port, dissolved oxygen probe, bio-aeration pool top is provided with division board, the air air outlet, the outer settling tank that is provided with in bio-aeration pool middle part, the settling tank upper end is provided with the settling tank overflow port, the bio-aeration pool lower sides is provided with air intake duct and dissolved oxygen probe, the bottom is provided with the air aeration dish in the bio-aeration pool, air intake duct one end links to each other with the air aeration dish, the air intake duct the other end links to each other with the air inlet pump, and the bio-aeration pool bottom is provided with the spoil disposal sulphur discharging pipeline; Alkali liquor circulating system comprises upflow tube, alkali lye circulation tube, NaOH solution circulating pump, pH probe, feed supplement pump, feed supplement pipe, reservoir overflow port, reservoir, be provided with the pH probe in the reservoir, the reservoir upper end is provided with the reservoir overflow port, the settling tank overflow port links to each other with reservoir by upflow tube, spray header links to each other with reservoir with NaOH solution circulating pump by the alkali lye circulation tube, and the feed supplement pump links to each other with reservoir by the feed supplement pipe.
Described packing layer and bio-aeration pool are cylindrical, and the packing layer aspect ratio is 4～5:1, and the aeration tank aspect ratio is 1.5～2:1, and packing layer and bio-aeration pool diameter ratio are 0.3～0.4:1.Be connected with conical side wall between described packing layer and the bio-aeration pool, the side bus of circular cone and axis angle are 40 ~ 50 °.Described settling tank is annular, and its internal diameter is the diameter of bio-aeration pool, and external diameter is 1.2～1.3:1 with the internal diameter ratio, and height is 0.8～0.9:1 with the internal diameter ratio.Described packing layer is 0.15～0.2:1 with bio-aeration pool effective volume ratio, and settling tank is 0.3～0.4:1 with bio-aeration pool effective volume ratio, and reservoir is 0.1～0.15:1 with bio-aeration pool effective volume ratio.Described division board is comprised of upper and lower two portions, division board top is divided into the turbination of upper and lower opening, the angle of circular cone side bus and axis is 40 ~ 50 °, the circular cone back cut diameter is 5～6:1 with the lower port diameter ratio, the division board bottom is divided into taper shape, the circular cone drift angle is 85 ~ 95 °, and the lower port diameter ratio of part is 1.8～2:1 on the bottom surface diameter of circular cone and the division board.Distance between described biogas air-spreading disk and the packing layer bottom is 10 ~ 15cm, and the distance between air aeration dish and the bio-aeration pool bottom is 15 ~ 20cm.
The beneficial effect that the present invention has: 1) chemical absorption and biological desulfurizing technology organically combine, and can bring into play strong point separately, both can realize high-efficiency desulfurization, satisfy the biogas service requirements, can control desulphurization cost again, make this technology be easy to promote; 2) chemical absorption layer, bio-aeration pool and settling tank integrate dexterously, and be compact to design, simple for structure, and the land used saving is easy to operate, is convenient to commercialization; 3) be provided with dissolved oxygen probe in the bio-aeration pool, can control dissolved oxygen in the bio-aeration pool by regulating aeration rate, can reduce the by product that the biological desulphurization process produces on the one hand, avoid secondary pollution, can reduce the alkali lye loss on the other hand, reduce running cost; 4) chemical absorption layer and biological desulphurization layer separate with division board, and the oxygen in the bio-aeration pool can directly not contact with biogas, can avoid biogas directly to contact the potential safety hazard that causes with oxygen, satisfies the security requirement of biogas desulfurization; 5) be provided with settling tank between bio-aeration pool and the spray liquid reservoir, both can have reduced biomass loss in the bio-aeration pool, can protect again spray header and packing layer not to be blocked by microorganism.
Description of drawings
Accompanying drawing is the structural representation of layer-stepping biological-chemical associating methane-desulfurizing device, among the figure: biogas escape pipe 1, spray header 2, packing layer 3, biogas inlet pipe 4, biogas air intake pump 5, biogas air-spreading disk 6, division board 7, settling tank 8, bio-aeration pool 9, air aeration dish 10, air inlet pump 11, air intake duct 12, spoil disposal sulphur discharging pipeline 13, air air outlet 14, settling tank overflow port 15, dissolved oxygen probe 16, upflow tube 17, alkali lye circulation tube 18, NaOH solution circulating pump 19, pH probe 20, feed supplement pump 21, feed supplement pipe 22, reservoir overflow port 23, reservoir 24.
Embodiment
As shown in Figure 1, layer-stepping biological-chemical associating methane-desulfurizing device comprises chemical absorption layer, biological desulphurization layer and alkali liquor circulating system; The chemical absorption layer is provided with biogas escape pipe 1, spray header 2, packing layer 3, biogas inlet pipe 4, biogas air intake pump 5 and biogas air-spreading disk 6 from top to bottom successively, and wherein biogas air intake pump 5 links to each other with biogas air-spreading disk 6 by biogas inlet pipe 4; The biological desulphurization layer comprises division board 7, settling tank 8, bio-aeration pool 9, air aeration dish 10, air inlet pump 11, air intake duct 12, spoil disposal sulphur discharging pipeline 13, air air outlet 14, settling tank overflow port 15, dissolved oxygen probe 16, bio-aeration pool 9 tops are provided with division board 7, air air outlet 14, bio-aeration pool is provided with settling tank 8 outside 9 middle parts, settling tank 8 upper ends are provided with settling tank overflow port 15, bio-aeration pool 9 lower sides are provided with air intake duct 12 and dissolved oxygen probe 16, bio-aeration pool 9 interior bottoms are provided with air aeration dish 10, air intake duct 12 1 ends link to each other with air aeration dish 10, air intake duct 12 the other ends link to each other with air inlet pump 11, and bio-aeration pool 9 bottoms are provided with spoil disposal sulphur discharging pipeline 13; Alkali liquor circulating system comprises upflow tube 17, alkali lye circulation tube 18, NaOH solution circulating pump 19, pH probe 20, feed supplement pump 21, feed supplement pipe 22, reservoir overflow port 23, reservoir 24, be provided with pH probe 20 in the reservoir 24, reservoir 24 upper ends are provided with reservoir overflow port 23, settling tank overflow port 15 links to each other with reservoir 24 by upflow tube 17, spray header 2 links to each other with reservoir 24 with NaOH solution circulating pump 19 by alkali lye circulation tube 18, and feed supplement pump 21 links to each other with reservoir 24 by feed supplement pipe 22.
Described packing layer 3 and bio-aeration pool 9 are cylindrical, and packing layer 3 aspect ratio are 4～5:1, and aeration tank 9 aspect ratio are 1.5～2:1, and packing layer 3 and bio-aeration pool 9 diameters ratio are 0.3～0.4:1.Be connected with conical side wall between described packing layer 3 and the bio-aeration pool 9, the side bus of circular cone and axis angle are 40 ~ 50 °.Described settling tank 8 is annular, and its internal diameter is the diameter of bio-aeration pool 9, and external diameter is 1.2～1.3:1 with the internal diameter ratio, and height is 0.8～0.9:1 with the internal diameter ratio.Described packing layer 3 is 0.15～0.2:1 with bio-aeration pool 9 effective volumes ratio, and settling tank 8 is 0.3～0.4:1 with bio-aeration pool 9 effective volumes ratio, and reservoir 20 is 0.1～0.15:1 with bio-aeration pool 9 effective volumes ratio.Described division board 7 is comprised of upper and lower two portions, division board 7 tops are divided into the turbination of upper and lower opening, the angle of circular cone side bus and axis is 40 ~ 50 °, the circular cone back cut diameter is 5～6:1 with the lower port diameter ratio, division board 7 bottoms are divided into taper shape, the circular cone drift angle is 85 ~ 95 °, and the lower port diameter ratio of part is 1.8～2:1 on the bottom surface diameter of circular cone and the division board 7.Distance between described biogas air-spreading disk 6 and packing layer 3 bottoms is 10 ~ 15cm, and the distance between air aeration dish 10 and bio-aeration pool 9 bottoms is 15 ~ 20cm.
The working process of layer-stepping biological-chemical associating methane-desulfurizing device is as follows: under the driving of biogas air intake pump 5, biogas enters the bottom of packing layer 3 by biogas inlet pipe 4 and biogas air-spreading disk 6, under pressure, from the bottom up by packing layer 3, in this process, hydrogen sulfide in the biogas is by the fallen alkali liquor absorption removal from packing layer 3 tops, and the biogas after the purification leaves this device from biogas escape pipe 1.Under action of gravity, the alkali lye that is absorbed with hydrogen sulfide drops down onto on the division board 7, and the slit flow in the middle of the process division board 7 is to bio-aeration pool 9, under the effect of desulfurization microorganism, sulfide is oxidized to sulphur simple substance, leaves this device from spoil disposal sulphur discharging pipeline 13, and alkali lye is reproduced simultaneously; Alkali lye after the regeneration under the driving of NaOH solution circulating pump 19, is sent to the top of packing layer 3 by flowing in the reservoir 20 by settling tank overflow port 15 and upflow tube 17 behind the microorganism under settling tank 8 precipitations by alkali lye circulation tube 18 and spray header 2.Under the driving of air inlet pump 11, air enters the bottom of bio-aeration pool 9 by air intake duct 12 and air aeration dish 10, under buoyancy, air passes the top that bio-aeration pool 9 enters bio-aeration pool from bottom to top, leaves this device by air air outlet 14 at last.Under the driving of feed supplement pump 21, the alkali lye that is dissolved with the required nutritive substance of microorganism enters reservoir 24 by feed supplement pipe 22, and for biological methane-desulfurizing device replenishes fresh alkali lye and nutritive substance, unnecessary liquid leaves this device from reservoir overflow port 23 simultaneously.
Claims (7)
1. a layer-stepping biological-chemical associating methane-desulfurizing device is characterized in that comprising chemical absorption layer, biological desulphurization layer and alkali liquor circulating system; The chemical absorption layer is provided with biogas escape pipe (1), spray header (2), packing layer (3), biogas inlet pipe (4), biogas air intake pump (5) and biogas air-spreading disk (6) from top to bottom successively, and wherein biogas air intake pump (5) links to each other with biogas air-spreading disk (6) by biogas inlet pipe (4); The biological desulphurization layer comprises division board (7), settling tank (8), bio-aeration pool (9), air aeration dish (10), air inlet pump (11), air intake duct (12), spoil disposal sulphur discharging pipeline (13), air air outlet (14), settling tank overflow port (15), dissolved oxygen probe (16), bio-aeration pool (9) top is provided with division board (7), air air outlet (14), the outer settling tank (8) that is provided with in bio-aeration pool (9) middle part, settling tank (8) upper end is provided with settling tank overflow port (15), bio-aeration pool (9) lower sides is provided with air intake duct (12) and dissolved oxygen probe (16), the interior bottom of bio-aeration pool (9) is provided with air aeration dish (10), air intake duct (12) one ends link to each other with air aeration dish (10), air intake duct (12) the other end links to each other with air inlet pump (11), and bio-aeration pool (9) bottom is provided with spoil disposal sulphur discharging pipeline (13); Alkali liquor circulating system comprises upflow tube (17), alkali lye circulation tube (18), NaOH solution circulating pump (19), pH pop one's head in (20), feed supplement pump (21), feed supplement pipe (22), reservoir overflow port (23), reservoir (24), be provided with pH probe (20) in the reservoir (24), reservoir (24) upper end is provided with reservoir overflow port (23), settling tank overflow port (15) links to each other with reservoir (24) by upflow tube (17), spray header (2) links to each other with reservoir (24) with NaOH solution circulating pump (19) by alkali lye circulation tube (18), and feed supplement pump (21) links to each other with reservoir (24) by feed supplement pipe (22).
2. a kind of layer-stepping biological-chemical according to claim 1 is united methane-desulfurizing device, it is characterized in that: described packing layer (3) and bio-aeration pool (9) are for cylindrical, packing layer (3) aspect ratio is 4～5:1, aeration tank (9) aspect ratio is 1.5～2:1, and packing layer (3) and bio-aeration pool (9) diameter ratio are 0.3～0.4:1.
3. a kind of layer-stepping biological-chemical associating methane-desulfurizing device according to claim 1 is characterized in that: be connected with conical side wall between described packing layer (3) and the bio-aeration pool (9), the side bus of circular cone and axis angle are 40 ~ 50 °.
4. a kind of layer-stepping biological-chemical according to claim 1 is united methane-desulfurizing device, it is characterized in that: described settling tank (8) is annular, its internal diameter is the diameter of bio-aeration pool (9), and external diameter is 1.2～1.3:1 with the internal diameter ratio, and height is 0.8～0.9:1 with the internal diameter ratio.
5. a kind of layer-stepping biological-chemical according to claim 1 is united methane-desulfurizing device, it is characterized in that: described packing layer (3) is 0.15～0.2:1 with bio-aeration pool (9) effective volume ratio, settling tank (8) is 0.3～0.4:1 with bio-aeration pool (9) effective volume ratio, and reservoir (20) is 0.1～0.15:1 with bio-aeration pool (9) effective volume ratio.
6. a kind of layer-stepping biological-chemical according to claim 1 is united methane-desulfurizing device, it is characterized in that: described division board (7) is comprised of upper and lower two portions, division board (7) top is divided into the turbination of upper and lower opening, the angle of circular cone side bus and axis is 40 ~ 50 °, the circular cone back cut diameter is 5～6:1 with the lower port diameter ratio, division board (7) bottom is divided into taper shape, the circular cone drift angle is 85 ~ 95 °, and the lower port diameter ratio of the upper part of the bottom surface diameter of circular cone and division board (7) is 1.8～2:1.
7. a kind of layer-stepping biological-chemical according to claim 1 is united methane-desulfurizing device, it is characterized in that: the distance between described biogas air-spreading disk (6) and packing layer (3) bottom is 10 ~ 15cm, and the distance between air aeration dish (10) and bio-aeration pool (9) bottom is 15 ~ 20cm.
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| CN104815550A (en) * | 2015-05-19 | 2015-08-05 | 农业部沼气科学研究所 | Biogas biological desulfurization device |
| CN104830392A (en) * | 2015-05-19 | 2015-08-12 | 农业部沼气科学研究所 | Biogas desulfurization device |
| CN106867608A (en) * | 2017-04-11 | 2017-06-20 | 常州大学 | A kind of methane-desulfurizing device |
| CN107129845A (en) * | 2017-05-27 | 2017-09-05 | 农业部沼气科学研究所 | A kind of biogas purification method of methane-generating pit |
| CN111632485A (en) * | 2020-05-11 | 2020-09-08 | 广东石油化工学院 | Biogas purification device based on biological desulfurization technology and purification method thereof |
| CN114471085A (en) * | 2021-12-27 | 2022-05-13 | 上海丛麟环保科技股份有限公司 | Hazardous waste incineration flue gas wet deacidification process and system |
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| CN103031172B (en) | 2013-12-25 |
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