CN116078129A - Desulfurization method for producing biogas through anaerobic digestion - Google Patents

Desulfurization method for producing biogas through anaerobic digestion Download PDF

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CN116078129A
CN116078129A CN202211708587.2A CN202211708587A CN116078129A CN 116078129 A CN116078129 A CN 116078129A CN 202211708587 A CN202211708587 A CN 202211708587A CN 116078129 A CN116078129 A CN 116078129A
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desulfurization
biogas
anaerobic digestion
gas storage
storage tank
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阳红
李永强
黄飚
刘海鑫
徐其龙
罗彬�
赵婉情
刘军
易卫华
周一龙
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Csic Environment Engineering Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/52—Hydrogen sulfide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75—Multi-step processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84—Biological processes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/10—Working-up natural gas or synthetic natural gas
    • C10L3/101—Removal of contaminants
    • C10L3/102—Removal of contaminants of acid contaminants
    • C10L3/103—Sulfur containing contaminants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/05—Biogas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

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  • Chemical & Material Sciences (AREA)
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  • Treatment Of Sludge (AREA)

Abstract

The invention provides a desulfurization method for producing biogas by anaerobic digestion. The method comprises the steps that methane is produced in methane production equipment by anaerobic digestion, and a desulfurization device comprises an anaerobic digestion gas storage tank, an oxygenerator, gas distribution equipment, a fan, a reaction tower and an adsorption tower, wherein desulfurization microorganisms grow at the gas-liquid section of the methane and the methane liquid to carry out primary desulfurization treatment; reacting the methane after the primary desulfurization treatment with an oxidative desulfurizing agent to perform secondary desulfurization treatment; biogas after secondary desulfurization treatment and adsorbentAnd carrying out three-stage desulfurization treatment on the reaction. The content of hydrogen sulfide in the biogas treated by the method is lower than 5mg/m 3 Total sulfur content of less than 6mg/m 3 The content of siloxanes is less than 10mg/m 3 The total chlorine content is less than 10mg/m 3 Meets the current biological natural gas standard requirement. The desulfurization method provided by the invention has the characteristics of simplicity in operation, low cost, low energy consumption, convenience in maintenance and the like, and has a huge market application prospect in the field of biological natural gas.

Description

Desulfurization method for producing biogas through anaerobic digestion
Technical Field
The invention relates to the technical field of biogas preparation and in particular relates to a desulfurization method for producing biogas by anaerobic digestion.
Background
In the organic waste recycling industry, the anaerobic digestion technology has the advantages of mature technology, capability of recycling biogas and biogas residue fertilizer, low operation cost and the like, and is widely applied to the fields of kitchen waste, livestock and poultry manure, municipal sludge, agricultural waste treatment and the like.
In the industrial application process of the biogas, desulfurization treatment is needed, and the traditional desulfurization treatment comprises biological desulfurization and dry desulfurization. The biogas is prepared from biogas and is used for industrial production and resident life, and is a main utilization mode in the current and future. The new biological natural gas standard GB/T41328-2022 has more strict requirements on indexes of impurity components such as hydrogen sulfide, total sulfur, siloxane, total chlorine and the like in the biological natural gas. The traditional desulfurization process not only can not meet the requirements of main limiting indexes, but also has the characteristics of high operation cost, complex maintenance and the like, and the development of desulfurization technology and equipment suitable for the current biological natural gas standard is urgently needed.
Disclosure of Invention
The invention aims to provide a desulfurization method for producing methane by anaerobic digestion aiming at the defects of the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a desulfurization method for producing biogas by anaerobic digestion, which is prepared from anaerobic digestion biogas production equipment and comprises the following specific steps:
step S1, growing desulfurization microorganisms on the gas-liquid section of the biogas and biogas slurry, and performing primary desulfurization treatment;
s2, reacting the methane subjected to the primary desulfurization treatment with an oxidative desulfurizing agent, and performing secondary desulfurization treatment;
s3, reacting the biogas subjected to the secondary desulfurization treatment with an adsorbent, and performing tertiary desulfurization treatment to obtain biogas meeting the requirements of biological natural standards;
the desulfurization device used in the desulfurization method comprises an anaerobic digestion gas storage tank, an oxygenerator, gas distribution equipment, a reaction tower and an adsorption tower,
the anaerobic digestion gas storage tank is respectively provided with a feed inlet for adding methane and a discharge outlet for discharging the methane, and a gas storage film is arranged at the top in the anaerobic digestion gas storage tank;
the gas distribution equipment is arranged in the anaerobic digestion gas storage tank and is positioned above the gas storage film, the oxygenerator is arranged outside the anaerobic digestion gas storage tank and is communicated with the gas distribution equipment through a pipeline, so that oxygen is uniformly distributed in methane, and primary desulfurization treatment is performed;
the inlet of the reaction tower is communicated with the discharge port of the anaerobic digestion gas storage tank so as to add the methane subjected to primary desulfurization treatment in the anaerobic digestion gas storage tank into the reaction tower and perform secondary desulfurization treatment;
the adsorption tower is communicated with the reaction tower so as to transfer the biogas subjected to the secondary desulfurization treatment in the reaction tower into the adsorption tower for tertiary desulfurization treatment.
In step S1, the concentration of oxygen in the biogas in the anaerobic digestion tank is 0.5-2.5%.
Further, the surface area of the tank body of the anaerobic digestion gas tank is more than 300m 2 。
Further, in step S2, the height of the reaction tower is not less than 1.5m.
Further, a feeding pipeline is arranged at the feeding port of the reaction tower and is communicated with the discharging port of the anaerobic digestion gas storage tank, and a fan is arranged on the feeding pipe.
Further, the oxidative desulfurizing agent comprises any one of ferric hydroxide, ferric oxide, tetraoxide, ferric trichloride, polymeric ferric chloride and polymeric ferric sulfate
Furthermore, the gas inlet and outlet end of the reaction tower is also provided with a methane flow meter, a pressure meter, an online hydrogen sulfide analyzer and an oxygen analyzer.
Further, in step S3, the adsorbent is activated carbon.
Further, the height of the adsorption tower is not less than 1.5m.
Furthermore, the outlet end of the adsorption tower is also provided with a pressure gauge, a flowmeter and an online hydrogen sulfide analyzer.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that:
(1) The invention provides a desulfurization method for producing biogas by anaerobic digestion, wherein the biogas is prepared from equipment for producing biogas by anaerobic digestion, and a desulfurization device comprises an anaerobic digestion gas storage tank, an oxygenerator, gas distribution equipment, a fan, a reaction tower and an adsorption tower. In-situ biological desulfurization is carried out in the anaerobic digestion tank, so that the equipment investment and the running cost are greatly reduced;
(2) The biogas desulfurization three-stage treatment process provided by the invention overcomes the defect that the traditional process cannot meet the current biogas impurity gas index requirement, and the treated biogas can enter a purification process to prepare biogas for industrial production and resident life; the content of hydrogen sulfide in the treated marsh gas is lower than 5mg/m 3 Total sulfurThe content is less than 6mg/m 3 The content of siloxanes is less than 10mg/m 3 The total chlorine content is less than 10mg/m 3 Meets the standard requirements of the existing biological natural gas;
(3) The biogas three-stage desulfurization device provided by the invention has the characteristics of stable operation, simplicity in operation, low cost, low energy consumption, convenience in maintenance and the like, and has a huge market application prospect in the field of biological natural gas.
Drawings
FIG. 1 is a schematic diagram of a desulfurizing device for producing biogas by anaerobic digestion;
in the figure: 1. anaerobic digestion gas storage tank; 2. an oxygenerator; 3. a gas distribution device; 4. a reaction tower; 41. a feed conduit; 42. a blower; 5. an adsorption tower.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in FIG. 1, the structure schematic diagram of the desulfurization device for producing methane by anaerobic digestion provided by the invention comprises an anaerobic digestion gas storage tank 1, an oxygenerator 2, gas distribution equipment 3, a reaction tower 4 and an adsorption tower 5. The gas distribution equipment 3 is arranged at the top part in the anaerobic digestion gas storage tank 1, the oxygenerator 2 is communicated with the gas distribution equipment 3 through a pipeline, oxygen is uniformly distributed in methane through the gas distribution equipment 3, and hydrogen sulfide gas is removed through biological reaction in the methane and the contact surface of the methane and digestive juice, namely primary desulfurization treatment. The reaction tower 4 is connected with the anaerobic digestion gas storage tank 1 through a pipeline, biogas is conveyed to the reaction tower 4 through a feeding pipeline 41 by a fan 42, and the biogas chemically reacts with a desulfurizing agent in the reaction tower 4 to achieve the desulfurizing effect, namely secondary desulfurization treatment. The adsorption tower 5 is connected with the reaction tower 4 through a pipeline, the biogas enters the adsorption tower 5 after reacting in the reaction tower, and the biogas and the adsorbent are subjected to adsorption reaction in the adsorption tower 5, so that the impurity gases such as biogas, siloxane and the like are further removed, namely three-stage desulfurization treatment is achieved.
In the primary desulfurization treatment process: the oxygenerator transmits oxygen to the anaerobic digestion gas storage through a pipeline and a gas distribution deviceThe oxygen content in the methane is kept between 0.5 percent and 2.5 percent at the gas storage membrane side of the tank 1, and a facultative anaerobic environment is formed at the liquid phase interface of the anaerobic digestion gas storage tank 1, so that desulfurization microorganisms are produced, biological desulfurization reaction occurs at the gas-liquid section of the methane and the methane liquid, hydrogen sulfide is removed under the action of microorganism desulfurization bacteria, in-situ biological desulfurization treatment in the tank is realized, and the hydrogen sulfide content in the methane after the microorganism treatment is lower than 200mg/m 3 。
In the secondary desulfurization treatment process: the methane after the primary desulfurization treatment is sent into a reaction tower 4 through a fan 41 to undergo oxidation-reduction reaction with an oxidative desulfurizing agent, so that hydrogen sulfide is oxidized into elemental sulfur; after passing through the reaction tower, the content of hydrogen sulfide in the marsh gas is lower than 20mg/m 3 The oxidative desulfurizing agent may be any one selected from the group consisting of iron oxyhydroxide, iron sesquioxide, trisomy oxide, iron trichloride, polymeric ferric chloride and polymeric ferric sulfate.
In the three-stage desulfurization treatment process: the biogas after the secondary desulfurization treatment is sent into an adsorption tower 5 through a pipeline, and the active carbon adsorbent can adsorb impurity gases such as hydrogen sulfide, siloxane, chlorine and the like to further purify the biogas; the activated carbon may be any one selected from granular activated carbon, honeycomb activated carbon and spherical activated carbon; after passing through the adsorption tower 5, the content of hydrogen sulfide in the marsh gas is lower than 5mg/m 3 Total sulfur content of less than 6mg/m 3 The content of siloxanes is less than 10mg/m 3 The total chlorine content is less than 10mg/m 3 Meets the current biological natural gas standard requirement.
In order to better implement the effect of monitoring desulfurization treatment, an on-line detection device for hydrogen sulfide and oxygen can be arranged in a gas storage film positioned at the inner top of the anaerobic digestion gas storage tank 1.
In order to better monitor the methane quality in the reaction tower 4 and the adsorption tower 5, a methane flowmeter, a pressure meter, a hydrogen sulfide online analyzer and an oxygen analyzer can be further arranged at the gas inlet and outlet ends of the reaction tower 4, and a pressure meter, a flowmeter, a hydrogen sulfide online analyzer and the like are arranged at the outlet end of the adsorption tower 5. A controller can be also arranged, and the controller is used for controlling the oxygen digestion gas storage tank 1, the oxygenerator 2, the gas distribution equipment 3, the reaction tower 4 and the adsorption tower 5 to realize on-line desulfurization.
In the invention, the height-diameter ratio of the anaerobic digestion gas storage tank 1 can be 1:1 and 1:2, and the volume is not less than 5000m 3 The method comprises the steps of carrying out a first treatment on the surface of the The oxygen production amount of the oxygenerator 2 is matched with the designed oxygen demand; the gas distribution device 3 can adopt perforated pipes for gas distribution and microporous films for gas distribution; the reaction tower 4 and the adsorption tower 5 can be made of glass fiber reinforced plastics and stainless steel; the anaerobic digestion gas storage tank 1, the oxygenerator 2, the gas distribution device 3, the reaction tower 4 and the adsorption tower 5 are all general devices in the technical field, and are not described in detail herein.
The effect of the biogas three-stage desulfurization method of the present invention is described and demonstrated by specific examples below.
Example 1
The biogas treatment scale of the engineering project of natural gas of a certain organism in Jiangxi is 20000m 3 /d。
The project designs an oxygenerator 2, three sets of gas distribution equipment 3 and three sets of anaerobic digestion gas storage tanks 1, the oxygenerator 2 transmits oxygen to the three sets of gas distribution equipment 3 through pipelines, and the design throughput of the oxygenerator 2 is 400m 3 And/d. Each set of anaerobic digestion gas storage tank 1 has a gas storage volume of 1500m 3 The concentration of oxygen in the biogas is controlled to be 0.7%, and the contact area of the biogas and biogas slurry is 450m 2 . CH in fresh biogas produced anaerobically from an anaerobic digestion tank 1 4 The content is 65%, CO 2 The content is 33%, H 2 S content is 2000mg/m 3 H in methane after in-situ biological desulfurization treatment 2 S content is less than 200mg/m 3 . The top of the anaerobic digestion gas storage tank 1 is provided with a methane online hydrogen sulfide analyzer and an oxygen analyzer, the concentration of oxygen and hydrogen sulfide in methane is detected, and the oxygen production amount of the oxygen generator 2 is regulated by the controller 6 to maintain the in-situ biological desulfurization effect in the system. Biogas is conveyed from the anaerobic digestion gas storage tank 1 to the reaction tower 4 through a fan 42 for oxidation reaction, three reaction towers 4 (dual-purpose one-standby) are designed, ferric hydroxide is filled in the reaction towers 4 as an oxidant, and the height of a filling layer is 3m. Biogas enters from the bottom of the reaction tower 4, and the treated biogas is discharged from the top of the reaction tower 5; the inlet and outlet of the reaction tower 5 are provided with an on-line pressure gauge and an on-line hydrogen sulfide tester, and are connected with a controller 6 to monitor the treatment effect of the reaction tower 4. Through the reaction tower 4After the treatment, the content of hydrogen sulfide in the marsh gas is lower than 40mg/m 3 The oxygen concentration is lower than 0.2%. Biogas enters through the top of the adsorption tower 5 and is discharged from the bottom of the adsorption tower 5; two adsorption towers 5 (one for one) are designed, granular activated carbon is filled in the adsorption towers 5, the height of a filling layer is 3m, an online hydrogen sulfide analyzer and an online pressure gauge are arranged at an exhaust port of the adsorption towers 5, and the two adsorption towers are connected with a controller 6 and used for detecting the treatment effect of the adsorption towers 5. After adsorption treatment by the adsorption tower 5, the content of hydrogen sulfide in the biogas is lower than 5mg/m 3 Total sulfur content of less than 6mg/m 3 The content of siloxanes is less than 10mg/m 3 The total chlorine content is less than 10mg/m 3 Meets the current biological natural gas standard requirement.
Example 2
Anaerobic digestion biogas desulfurization project for kitchen waste in Xinjiang area, and treatment scale is 5000m 3 /d。
The project designs an oxygenerator 2, a set of gas distribution equipment 3 and a set of anaerobic digestion gas storage tank 1, the oxygenerator 2 is used for conveying oxygen by the gas distribution equipment 3 through a pipeline, and the design throughput of the oxygenerator 2 is 100m 3 And/d. Anaerobic digestion gas storage tank 1 gas storage volume 500m 3 The concentration of oxygen in the biogas is controlled to be 1.2 percent, and the contact area of the biogas and biogas slurry is 200m 2 . CH in fresh biogas produced anaerobically from an anaerobic digestion tank 1 4 The content is 55%, CO 2 The content is 38%, H 2 S content is 1500mg/m 3 H in methane after in-situ biological desulfurization treatment 2 S content is less than 180mg/m 3 . The top of the anaerobic digestion gas storage tank 1 is provided with a methane online hydrogen sulfide analyzer and an oxygen analyzer, the concentration of oxygen and hydrogen sulfide in methane is detected, and the oxygen production amount of the oxygen generator 2 is regulated by the controller 6 to maintain the in-situ biological desulfurization effect of the anaerobic digestion gas storage tank 1. Biogas is conveyed from the anaerobic digestion gas storage tank 1 to the reaction towers 4 through the fan 42 for oxidation reaction, two reaction towers 4 (one for each) are designed, ferric hydroxide is filled in the reaction towers 4 as an oxidant, and the height of a filling layer is 2m. Biogas enters from the bottom of the reaction tower 4, and the treated biogas is discharged from the top of the reaction tower 4; an inlet and an outlet of the reaction tower 4 are provided with an on-line pressure gauge, an on-line hydrogen sulfide tester and a controllerAnd 6, connecting, and monitoring the treatment effect of the reaction tower 4. After being treated by the reaction tower 4, the content of hydrogen sulfide in the marsh gas is lower than 20mg/m 3 The oxygen concentration is lower than 0.2%. Biogas enters through the top of the adsorption tower 5 and is discharged from the bottom of the adsorption tower 5; two adsorption towers 5 (one for one) are designed, granular activated carbon is filled in the adsorption towers 5, the height of a filling layer is 1.5m, an online hydrogen sulfide analyzer and an online pressure gauge are arranged at an exhaust port of the adsorption towers 5, and the two adsorption towers are connected with a controller 6 and used for detecting the treatment effect of the adsorption towers 5. After adsorption treatment by the adsorption tower 5, the content of hydrogen sulfide in the biogas is lower than 5mg/m 3 Total sulfur content of less than 6mg/m 3 The content of siloxanes is less than 10mg/m 3 The total chlorine content is less than 10mg/m 3 Meets the current biological natural gas standard requirement.
The above is not related to the prior art.
While certain specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the foregoing examples are provided for the purpose of illustration only and are not intended to limit the scope of the invention, and that various modifications or additions and substitutions to the described specific embodiments may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the invention as defined in the accompanying claims. It should be understood by those skilled in the art that any modification, equivalent substitution, improvement, etc. made to the above embodiments according to the technical substance of the present invention should be included in the scope of protection of the present invention.

Claims (10)

1. A desulfurization method for producing biogas by anaerobic digestion, wherein the biogas is prepared from equipment for producing biogas by anaerobic digestion, and the desulfurization method is characterized by comprising the following specific steps:
s1, growing desulfurization microorganisms on the gas-liquid section of the biogas and biogas slurry, and performing primary desulfurization treatment;
s2, reacting the methane subjected to the primary desulfurization treatment with an oxidative desulfurizing agent, and performing secondary desulfurization treatment;
s3, reacting the biogas subjected to the secondary desulfurization treatment with an adsorbent, and performing tertiary desulfurization treatment to obtain biogas meeting the requirements of biological natural standards;
the desulfurization device used in the desulfurization method comprises an anaerobic digestion gas storage tank (1), an oxygenerator (2), gas distribution equipment (3), a reaction tower (4) and an adsorption tower (5),
the anaerobic digestion gas storage tank (1) is respectively provided with a feed inlet for adding biogas and a discharge outlet for discharging biogas, and a gas storage film (11) is arranged at the bottom in the anaerobic digestion gas storage tank (1);
the gas distribution device (3) is arranged in the anaerobic digestion gas storage tank (1) and is positioned above the gas storage membrane (11), the oxygenerator (2) is arranged outside the anaerobic digestion gas storage tank (1) and is communicated with the gas distribution device (3) through a pipeline, so that oxygen is uniformly distributed in methane, and primary desulfurization treatment is performed;
the inlet of the reaction tower (4) is communicated with the discharge port of the anaerobic digestion gas storage tank (1) so as to add the methane subjected to primary desulfurization treatment in the anaerobic digestion gas storage tank (1) into the reaction tower (4) and perform secondary desulfurization treatment;
the adsorption tower (5) is communicated with the reaction tower (4) so as to transfer the biogas subjected to the secondary desulfurization treatment in the reaction tower (4) into the adsorption tower (5) for tertiary desulfurization treatment.
2. The desulfurization method according to claim 1, wherein in step S1, the concentration of oxygen in the biogas in the anaerobic digestion tank (1) is 0.5 to 2.5%.
3. The desulfurization method as claimed in claim 2, characterized in that the surface area of the tank body of the anaerobic digestion tank (1) is greater than 300m 2 。
4. The desulfurization method according to claim 2, characterized in that in step S2, the height of the reaction column (4) is not less than 1.5m.
5. The desulfurization method according to claim 4, characterized in that a feed pipe (41) is arranged at the feed inlet of the reaction tower (4), the feed pipe (41) is communicated with the discharge outlet of the anaerobic digestion gas storage tank (1), and a fan (42) is arranged on the feed pipe (41).
6. The desulfurization method of claim 4, wherein the oxidative desulfurization agent comprises any one of iron oxyhydroxide, iron sesquioxide, trisomy tetroxide, iron trichloride, polymeric ferric chloride, and polymeric ferric sulfate.
7. The desulfurization method according to claim 5, wherein the gas inlet and outlet ends of the reaction tower (4) are further provided with a biogas flowmeter, a pressure gauge, a hydrogen sulfide online analyzer and an oxygen analyzer.
8. The desulfurization method according to claim 2, wherein in step S3, the adsorbent is activated carbon.
9. The desulfurization method according to claim 8, characterized in that the height of the adsorption column (5) is not less than 1.5m.
10. The desulfurization method according to claim 9, characterized in that the outlet end of the adsorption tower (5) is further provided with a pressure gauge, a flow meter and an on-line analyzer for hydrogen sulfide.
CN202211708587.2A 2022-12-29 2022-12-29 Desulfurization method for producing biogas through anaerobic digestion Pending CN116078129A (en)

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