CN111411004B - Method and device for efficiently purifying biogas by using pressure swing adsorption principle - Google Patents

Method and device for efficiently purifying biogas by using pressure swing adsorption principle Download PDF

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CN111411004B
CN111411004B CN202010240900.9A CN202010240900A CN111411004B CN 111411004 B CN111411004 B CN 111411004B CN 202010240900 A CN202010240900 A CN 202010240900A CN 111411004 B CN111411004 B CN 111411004B
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tower
biogas
adsorption tower
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drying
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CN111411004A (en
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牛晓君
王竹婷
吕梦雨
郭华芳
唐志华
刘敏茹
林璋
张冬青
张荔
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Guangdong University of Petrochemical Technology
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    • 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
    • C10L3/106—Removal of contaminants of water
    • 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
    • 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
    • C10L3/104—Carbon dioxide
    • 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

Abstract

The invention discloses a method for utilizing the principle of pressure swing adsorptionThe method for efficiently purifying the biogas comprises pretreatment, wherein the biogas generated after anaerobic fermentation is sequentially introduced into a desulfurizing tower, a drying tower and a filtering tower for pretreatment, a desulfurizing agent in the desulfurizing tower is used for removing sulfides in the biogas, a drying agent in the drying tower is used for drying and dehydrating the biogas, and a filter element of the filtering tower removes insoluble large-particle impurities in the biogas; pressure swing adsorption, namely introducing the compressed methane into a first-stage adsorption tower, and utilizing a purification adsorbent filled in the first-stage adsorption tower to adsorb CO in the compressed methane2Adsorbing to obtain primary purified biogas, introducing into a secondary adsorption tower, and adsorbing CO again2Obtaining purified methane; desorbing and regenerating CO adsorbed in the first-stage adsorption tower2When saturation is reached, the first-stage adsorption tower and the second-stage adsorption tower are vacuumized to ensure that CO is adsorbed2Desorbing and releasing gas; the invention has reasonable process design and high biogas purification efficiency, and is suitable for mass popularization.

Description

Method and device for efficiently purifying biogas by using pressure swing adsorption principle
Technical Field
The invention relates to the technical field of biogas purification, in particular to a method and a device for efficiently purifying biogas by utilizing a pressure swing adsorption principle.
Background
Biogas is a combustible gaseous mixture produced by microorganisms, the main component of which is methane, with a content of about 50-75%, followed by 25-45% carbon dioxide, in addition to other gases such as hydrogen sulfide, carbon monoxide, nitrogen, water vapor, oxygen, etc. The purification of the biogas mainly comprises the removal of hydrogen sulfide, carbon dioxide, sulfur dioxide, halogenated mixed gas and siloxane in the biogas. Pressure swing adsorption is an important process from biogas purification to natural gas, and means that the mixture gas is separated, purified and purified through a cyclic process of pressure adsorption and decompression or normal pressure desorption or flushing replacement regeneration at a certain temperature. PSA is seen to achieve adsorption and desorption by varying the pressure. The adsorption is usually carried out under a pressure environment, and the pressure swing adsorption provides a method combining pressurization and depressurization, and at a certain temperature, the pressure swing adsorption is usually an adsorption-desorption cyclic operation system consisting of pressurization adsorption and depressurization regeneration. The adsorption quantity of the adsorbent to the adsorbate is increased along with the increase of the pressure and is reduced along with the decrease of the pressure, and simultaneously, in the pressure reduction process, the adsorbed gas is released to regenerate the adsorbent, so that the separation or purification of the multi-component mixed gas is realized, the regeneration of the adsorbent can be carried out without supplying heat from the outside, and the pressure change can be partially compensated by a multi-tower pressure equalizing method in the adsorption-regeneration cycle operation, thereby reducing the pressure drop loss.
However, in the prior art, the process structure for purifying the biogas by using the pressure swing adsorption principle is complex, so that the corresponding equipment has large volume and high energy consumption; meanwhile, the biogas purification efficiency is low and the effect is poor.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method and a device for efficiently purifying methane by using a pressure swing adsorption principle, which have good purification effect and high efficiency.
The technical scheme of the invention is as follows: a method for efficiently purifying biogas by using a pressure swing adsorption principle comprises the following steps:
s1, preprocessing;
s11, introducing the biogas generated after anaerobic fermentation into a desulfurizing tower, and removing sulfides in the biogas by using a desulfurizing agent in the desulfurizing tower;
s12, introducing the biogas desulfurized in the step S11 into a drying tower, removing water in the desulfurized biogas to enable the water content of the desulfurized biogas to be 2-9 mg/kg, and obtaining dry biogas;
s13, introducing the dried biogas obtained in the step S12 into a filter tower, and removing insoluble impurities in the dried biogas; regulating the pressure of the outlet gas of the filter tower to 0.5-1.0 MPa to obtain compressed methane;
s2, pressure swing adsorption;
s21, intermittently introducing the compressed marsh gas obtained in the step S13 into a primary adsorption tower, and using a purification adsorbent filled in the primary adsorption tower to treat CO in the compressed marsh gas2Carrying out adsorption to obtain primary purified methane; wherein the flow of the compressed methane is controlled to be 1-3 m3The air inlet intermittent time is 3-5 min, and the air inlet temperature is 50-150 ℃;
s22, regulating the pressure of the primary purified biogas obtained in the step S21 to 1.0-1.5 MPa, intermittently introducing the primary purified biogas into a secondary adsorption tower, and using a purification adsorbent filled in the secondary adsorption tower to carry out CO (carbon monoxide) treatment on the compressed biogas2Adsorbing to obtain purified methane; wherein the flow of the primary purified biogas is controlled to be 2-5 m3The air inlet intermittent time is 1-3 min, and the air inlet temperature is 150-250 ℃;
s3, desorption and regeneration;
when CO is adsorbed in the first-stage adsorption tower2When saturation is reached, stopping introducing the compressed methane into the first-stage adsorption tower, and simultaneously carrying out vacuumizing operation on the first-stage adsorption tower and the second-stage adsorption tower to ensure that CO adsorbed on the purification adsorbent in the first-stage adsorption tower and the second-stage adsorption tower is absorbed by the purification adsorbent2And desorbing the gas, releasing the gas and realizing the regeneration of the purification adsorbent.
Further, in step S11, the desulfurizing agent is composed of the following raw materials in parts by weight: 15-30 parts of organic amine desulfurizer, 8-15 parts of sulfoxide, 1-8 parts of polyethylene glycol, 5-16 parts of propylene carbonate and 20-35 parts of deionized water, and the desulfurizer prepared according to the proportion has a long service life, so that the replacement frequency of the desulfurizer is reduced, and the economic benefit is improved.
Furthermore, the preparation method of the desulfurizing agent comprises the following steps: mixing and reacting an organic amine desulfurizer with sulfoxide and polyethylene glycol, and controlling the pH value of the reaction to be 6-8 to generate colloidal precipitate; oxidizing the colloidal precipitate with oxygen-enriched gas, and filtering; washing the filtered precipitate for 2-5 times, uniformly mixing the precipitate with propylene carbonate and deionized water, carrying out extrusion forming on the mixed material on a forming machine, and naturally drying to obtain the desulfurizer; the desulfurizer removes sulfides in the biogas, relieves the pressure in the aspect of environmental protection, and simultaneously improves the quality of the biogas.
Further, in step S12, the drying agent used in the drying tower is a composite drying agent, and the composite drying agent is compounded by the following raw materials in parts by weight: 16-33 parts of magnesium sulfate, 12-21 parts of sodium carbonate, 10-20 parts of calcium chloride, 8-23 parts of calcium carbonate, 7-19 parts of calcium hydride and 10-25 parts of deionized water; the drying agent in the proportion can dry various impurity gases in the methane, and has higher drying efficiency.
Further, in step S13, the filter membrane in the filter tower is one of a polyamide fiber membrane, a polyimide hollow fiber membrane, and a polyvinylidene fluoride hollow fiber membrane.
Further, in step S21, the purification adsorbent is composed of the following raw materials in parts by weight: 15-26 parts of aluminum oxide, 5-18 parts of carbon molecular sieve, 8-17 parts of sodium sulfate, 10-23 parts of zeolite and 18-30 parts of deionized water, and the carbon dioxide gas in the purified adsorbent methane prepared according to the proportion has good adsorption performance, no by-product is generated in the adsorption process, and the adsorption efficiency of the carbon dioxide adsorbent is improved.
Furthermore, the preparation method of the purification adsorbent comprises the following steps: 1. adding deionized water into a hydrothermal kettle, then adding alumina and a carbon molecular sieve into the hydrothermal kettle, and uniformly stirring; 2. preparing sodium sulfate into a salt solution, and adding the salt solution into a hydrothermal kettle; 3. and finally, adding zeolite into a hydrothermal kettle for reaction, controlling the temperature of the hydrothermal kettle to be 90-130 ℃, reacting for 20-50 min, and cooling the reaction material after the reaction is finished to obtain the purified adsorbent.
A device for efficiently purifying biogas by utilizing a pressure swing adsorption principle comprises a desulfurizing tower, a drying tower, a filtering tower, a primary adsorption tower and a secondary adsorption tower; the desulfurizing tower, the drying tower, the filtering tower, the primary adsorption tower and the secondary adsorption tower are sequentially connected through a conduit, a Roots blower and a desulfurizing assembly are sequentially arranged in the desulfurizing tower from top to bottom, an air outlet of the Roots blower is connected with the drying tower through the conduit, an air inlet is formed in the lower end of the side wall of the desulfurizing tower, the desulfurizing assembly comprises a fixed sleeve, a vent plate and a desulfurizing agent carrier frame, the fixed sleeve is vertically arranged in the desulfurizing tower, the vent plate and the desulfurizing agent carrier frame are sequentially sleeved on the fixed sleeve, the vent plate is located at the lower end of the desulfurizing agent carrier frame, and a desulfurizing agent is arranged; the drying tower is internally provided with a drying agent placing frame, the drying agent placing frame comprises an outer sleeve and an inner sleeve, the inner sleeve is sleeved inside the outer sleeve, the inner sleeve and the outer sleeve are provided with connecting plates, the connecting plates are provided with 5-8 groups in pairs, the 5-8 groups of connecting plates divide a region enclosed by the inner sleeve and the outer sleeve into 5-8 drying regions and air inlet regions, each connecting plate is provided with an opening, and a drying agent is arranged inside each drying region; the filter element is arranged in the filter tower, the upper end and the lower end of the filter element are respectively fixedly connected with the filter tower through the mounting plate, the lower end of the filter element is closed, the upper end of the filter element penetrates through the mounting plate, through holes are uniformly formed in the mounting plate at the lower end of the filter tower, and the through holes are positioned on the outer side of the filter element; both ends all are provided with even gas board about the one-level adsorption tower is inside, be provided with between two even gas boards and place a net section of thick bamboo, place the inside purification adsorbent that is provided with of net section of thick bamboo, the one-level adsorption tower upper end is provided with desorption mouth, be provided with the control valve on the desorption mouth, the second grade adsorption tower is the same with the structure of one-level adsorption tower, be provided with the gas vent on the second grade adsorption tower, set up the control valve on the gas vent, and all be provided with the control valve on the connecting tube between second grade adsorption tower, one-level adsorption tower and the.
Furthermore, 3-6 air-permeable plates and 3-6 desulfurizer carrier frames are arranged in pairs, and the contact time of the biogas and the desulfurizer is prolonged by arranging the 3-6 air-permeable plates and the desulfurizer carrier frames, so that the desulfurization effect of the biogas is improved.
Furthermore, 5-8 filter cores are arranged, 5-8 filter cores are uniformly distributed between the two mounting plates, and 5-8 filter cores are arranged, so that the air inflow of the filter cores in unit time is improved, and the methane filtering effect is improved.
The working principle of the device is as follows: when the device is used, biogas to be purified is introduced into the desulfurizing tower through the air inlet, the biogas sequentially passes through the air permeable plate and the desulfurizing agent carrier frame under the action of the Roots blower, and sulfides in the biogas are absorbed by the desulfurizing agent on the desulfurizing carrier frame; the desulfurized biogas enters the drying tower through the guide pipe, firstly enters the gas inlet area, then enters the drying area through the opening on the connecting plate, and is dried and dehydrated by the drying agent in the drying area; the dried and dehydrated marsh gas enters the filter tower through the conduit, the marsh gas enters the filter core from the outside of the filter core, large-particle impurities in the marsh gas are filtered by the filter core, and the filtered marsh gas is discharged through the upper end of the filter core; filtered biogas enters a primary adsorption tower through a guide pipe, passes through a gas homogenizing plate at the bottom of the primary adsorption tower and is then placed in a purification adsorbent in a net cylinder for adsorption treatment, carbon dioxide in the biogas is adsorbed, then the biogas is discharged through the gas homogenizing plate at the top of the primary adsorption tower, enters a secondary adsorption tower and finally is discharged through an exhaust port to form clean biogas; when the adsorption capacity of the purification adsorbent in the first-stage adsorption tower and the second-stage adsorption tower is full, the control valves among the filter tower, the first-stage adsorption tower and the second-stage adsorption tower are closed, the control valve on the exhaust port is closed, the control valves on the two desorption ports are opened simultaneously, and the first-stage adsorption tower and the second-stage adsorption tower are vacuumized, so that carbon dioxide adsorbed on the purification adsorbent in the first-stage adsorption tower and the second-stage adsorption tower is desorbed.
Compared with the prior art, the invention has the beneficial effects that: the process has reasonable structural design, the biogas is desulfurized, dried and filtered before being purified, sulfur-containing gas, moisture and insoluble particle impurities in the biogas are removed, the equipment is prevented from being corroded by acid gas and moisture, the practicability and the reliability of the process are improved, the carbon dioxide gas in the biogas is adsorbed by a pressure swing adsorption principle, the concentration of methane in the biogas is effectively improved, and the adsorbed carbon dioxide can be recycled after being desorbed, so that the emission of the carbon dioxide is reduced, and the load of the device is reduced; the process of the invention is used for purifying and purifying the biogas, the whole process flow has no emission of toxic and harmful gases, and the harmonious development of the environment and the society is effectively promoted on the premise of meeting the biogas purification standard.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 2 is a schematic structural view of a desulfurization module of the present invention;
FIG. 3 is a schematic view of the connection of the inner and outer sleeves of the present invention;
FIG. 4 is a schematic view of the attachment of the filter element of the present invention to a mounting plate;
the device comprises a desulfurizing tower 1, a roots blower 10, a desulfurizing component 11, a fixed sleeve 110, a ventilating plate 111, a desulfurizing agent carrier frame 112, an air inlet 12, a drying tower 2, a drying agent placing frame 20, an outer sleeve 200, an inner sleeve 201, a connecting plate 202, a drying area 203, an air inlet area 204, a filtering tower 3, a filtering core 30, a mounting plate 31, a through hole 310, a primary adsorption tower 4, a uniform air plate 40, a net cylinder 41, a desorption port 42, a control valve 420, a secondary adsorption tower 5 and an exhaust port 50.
Detailed Description
Example 1: a method for efficiently purifying biogas by using a pressure swing adsorption principle comprises the following steps:
s1, preprocessing;
s11, introducing the biogas generated after anaerobic fermentation into a desulfurizing tower 1, and removing sulfides in the biogas by using a desulfurizing agent in the desulfurizing tower 1, wherein the desulfurizing agent is a commercially available biogas desulfurizing agent;
s12, introducing the biogas desulfurized in the step S11 into a drying tower 2, and removing water in the desulfurized biogas to ensure that the water content of the desulfurized biogas is 2mg/kg, thereby obtaining dry biogas; the drying agent used in the drying tower 2 is a commercial silica gel drying agent;
s13, introducing the dried biogas obtained in the step S12 into a filter tower 3, and removing insoluble impurities in the dried biogas; regulating the pressure of the outlet gas of the filter tower 3 to 0.5MPa to obtain compressed methane; the filter membrane in the filter tower 3 is a polyamide fiber membrane;
s2, pressure swing adsorption;
s21, intermittently introducing the compressed marsh gas obtained in the step S13 into the primary adsorption tower 4, and utilizing the purification adsorbent filled in the primary adsorption tower 4 to treat CO in the compressed marsh gas2To carry outAbsorbing to obtain primary purified methane; wherein the flow of the compressed methane is controlled to be 1m3H, the air inlet intermittent time is 3min, and the air inlet temperature is 50 ℃; the purification adsorbent is a commercially available activated carbon adsorbent;
s22, regulating the pressure of the primary purified marsh gas obtained in the step S21 to 1.0MPa, intermittently introducing the primary purified marsh gas into a secondary adsorption tower 5, and utilizing the purification adsorbent filled in the secondary adsorption tower 5 to carry out CO purification on the compressed marsh gas2Adsorbing to obtain purified methane; wherein the flow of the primary purified biogas is controlled to be 2m3The air inlet intermittent time is 1min, and the air inlet temperature is 150 ℃; the purification adsorbent is a commercially available activated carbon adsorbent;
s3, desorption and regeneration;
when CO is adsorbed in the first-stage adsorption tower 42When saturation is reached, the compressed methane is stopped from being introduced into the first-stage adsorption tower 4, and the first-stage adsorption tower 4 and the second-stage adsorption tower 5 are vacuumized, so that CO adsorbed on the purification adsorbent in the first-stage adsorption tower 4 and the second-stage adsorption tower 5 is adsorbed on the purification adsorbent2And desorbing the gas, releasing the gas and realizing the regeneration of the purification adsorbent.
Example 2: a method for efficiently purifying biogas by using a pressure swing adsorption principle comprises the following steps:
s1, preprocessing;
s11, introducing the biogas generated after anaerobic fermentation into a desulfurizing tower 1, and removing sulfides in the biogas by using a desulfurizing agent in the desulfurizing tower 1, wherein the desulfurizing agent is a commercially available biogas desulfurizing agent;
s12, introducing the biogas desulfurized in the step S11 into a drying tower 2, and removing water in the desulfurized biogas to ensure that the water content of the desulfurized biogas is 6mg/kg, thereby obtaining dry biogas; the drying agent used in the drying tower 2 is a commercial silica gel drying agent;
s13, introducing the dried biogas obtained in the step S12 into a filter tower 3, and removing insoluble impurities in the dried biogas; regulating the pressure of the outlet gas of the filter tower 3 to 0.8MPa to obtain compressed methane; the filter membrane in the filter tower 3 is a polyimide hollow fiber membrane;
s2, pressure swing adsorption;
s21, compressing the marsh gas obtained in the step S13Intermittently introducing into the first-stage adsorption tower 4, and purifying the CO in the compressed methane by using the purification adsorbent filled in the first-stage adsorption tower 42Carrying out adsorption to obtain primary purified methane; wherein the flow of the compressed methane is controlled to be 2m3H, the air inlet intermittent time is 3min, and the air inlet temperature is 80 ℃; the purification adsorbent is a commercially available activated carbon adsorbent;
s22, regulating the pressure of the primary purified marsh gas obtained in the step S21 to 1.2MPa, intermittently introducing the primary purified marsh gas into a secondary adsorption tower 5, and utilizing the purification adsorbent filled in the secondary adsorption tower 5 to carry out CO purification on the compressed marsh gas2Adsorbing to obtain purified methane; wherein, the flow of the primary purified biogas is controlled to be 4m3The air inlet intermittent time is 23min, and the air inlet temperature is 180 ℃;
s3, desorption and regeneration;
when CO is adsorbed in the first-stage adsorption tower 42When saturation is reached, the compressed methane is stopped from being introduced into the first-stage adsorption tower 4, and the first-stage adsorption tower 4 and the second-stage adsorption tower 5 are vacuumized, so that CO adsorbed on the purification adsorbent in the first-stage adsorption tower 4 and the second-stage adsorption tower 5 is adsorbed on the purification adsorbent2And desorbing the gas, releasing the gas and realizing the regeneration of the purification adsorbent.
Example 3: a method for efficiently purifying biogas by using a pressure swing adsorption principle comprises the following steps:
s1, preprocessing;
s11, introducing the biogas generated after anaerobic fermentation into a desulfurizing tower 1, and removing sulfides in the biogas by using a desulfurizing agent in the desulfurizing tower 1, wherein in the step S11, the desulfurizing agent is composed of the following raw materials in parts by weight: 15 parts of organic amine desulfurizer, 8 parts of sulfoxide, 1 part of polyethylene glycol, 5 parts of propylene carbonate and 20 parts of deionized water, and the desulfurizer prepared according to the proportion has a longer service cycle, so that the replacement frequency of the desulfurizer is reduced, and the economic benefit is improved; the preparation method of the desulfurizer comprises the following steps: mixing and reacting an organic amine desulfurizer with sulfoxide and polyethylene glycol, and controlling the pH value of the reaction to be 6 to generate colloidal precipitate; oxidizing the colloidal precipitate with oxygen-enriched gas, and filtering; washing the filtered precipitate for 2 times, uniformly mixing the precipitate with propylene carbonate and deionized water, carrying out extrusion forming on the mixed material on a forming machine, and naturally drying to obtain the desulfurizer; the desulfurizer removes sulfides in the biogas, relieves the pressure in the aspect of environmental protection, and simultaneously improves the quality of the biogas;
s12, introducing the biogas desulfurized in the step S11 into a drying tower 2, and removing water in the desulfurized biogas to ensure that the water content of the desulfurized biogas is 9mg/kg, thereby obtaining dry biogas; the drying agent used in the drying tower 2 is a commercial silica gel drying agent;
s13, introducing the dried biogas obtained in the step S12 into a filter tower 3, and removing insoluble impurities in the dried biogas; regulating the pressure of the outlet gas of the filter tower 3 to 1.0MPa to obtain compressed methane; the filter membrane in the filter tower 3 is a polyvinylidene fluoride hollow fiber membrane;
s2, pressure swing adsorption;
s21, intermittently introducing the compressed marsh gas obtained in the step S13 into the primary adsorption tower 4, and utilizing the purification adsorbent filled in the primary adsorption tower 4 to treat CO in the compressed marsh gas2Carrying out adsorption to obtain primary purified methane; wherein the flow of the compressed methane is controlled to be 3m3H, the air inlet intermittent time is 5min, and the air inlet temperature is 150 ℃; the purification adsorbent is a commercially available activated carbon adsorbent;
s22, regulating the pressure of the primary purified marsh gas obtained in the step S21 to 1.5MPa, intermittently introducing the primary purified marsh gas into a secondary adsorption tower 5, and utilizing the purification adsorbent filled in the secondary adsorption tower 5 to carry out CO purification on the compressed marsh gas2Adsorbing to obtain purified methane; wherein, the flow of the primary purified biogas is controlled to be 5m3The air inlet intermittent time is 3min, and the air inlet temperature is 250 ℃;
s3, desorption and regeneration;
when CO is adsorbed in the first-stage adsorption tower 42When saturation is reached, the compressed methane is stopped from being introduced into the first-stage adsorption tower 4, and the first-stage adsorption tower 4 and the second-stage adsorption tower 5 are vacuumized, so that CO adsorbed on the purification adsorbent in the first-stage adsorption tower 4 and the second-stage adsorption tower 5 is adsorbed on the purification adsorbent2And desorbing the gas, releasing the gas and realizing the regeneration of the purification adsorbent.
Example 4: a method for efficiently purifying biogas by using a pressure swing adsorption principle comprises the following steps:
s1, preprocessing;
s11, introducing the biogas generated after anaerobic fermentation into a desulfurizing tower 1, and removing sulfides in the biogas by using a desulfurizing agent in the desulfurizing tower 1, wherein in the step S11, the desulfurizing agent is composed of the following raw materials in parts by weight: 30 parts of organic amine desulfurizer, 15 parts of sulfoxide, 8 parts of polyethylene glycol, 16 parts of propylene carbonate and 30 parts of deionized water, and the desulfurizer prepared according to the proportion has a longer service cycle, so that the replacement frequency of the desulfurizer is reduced, and the economic benefit is improved; the preparation method of the desulfurizer comprises the following steps: mixing and reacting an organic amine desulfurizer with sulfoxide and polyethylene glycol, and controlling the pH value of the reaction to be 8 to generate colloidal precipitate; oxidizing the colloidal precipitate with oxygen-enriched gas, and filtering; washing the filtered precipitate for 5 times, uniformly mixing the precipitate with propylene carbonate and deionized water, carrying out extrusion forming on the mixed material on a forming machine, and naturally drying to obtain the desulfurizer; the desulfurizer removes sulfides in the biogas, relieves the pressure in the aspect of environmental protection, and simultaneously improves the quality of the biogas;
s12, introducing the biogas desulfurized in the step S11 into a drying tower 2, and removing water in the desulfurized biogas to ensure that the water content of the desulfurized biogas is 8mg/kg, thereby obtaining dry biogas; the drying agent used in the drying tower 2 is a composite drying agent which is compounded by the following raw materials in parts by weight: 16 parts of magnesium sulfate, 12 parts of sodium carbonate, 10 parts of calcium chloride, 8 parts of calcium carbonate, 7 parts of calcium hydride and 10 parts of deionized water; the drying agent in the proportion can dry various impurity gases in the biogas, and has higher drying efficiency;
s13, introducing the dried biogas obtained in the step S12 into a filter tower 3, and removing insoluble impurities in the dried biogas; regulating the pressure of the outlet gas of the filter tower 3 to 0.5MPa to obtain compressed methane; the filter membrane in the filter tower 3 is a polyimide hollow fiber membrane;
s2, pressure swing adsorption;
s21, intermittently introducing the compressed marsh gas obtained in the step S13 into the primary adsorption tower 4, and utilizing the purification adsorbent filled in the primary adsorption tower 4 to treat CO in the compressed marsh gas2Carrying out adsorption to obtain primary purified methane; wherein the flow of the compressed methane is controlled to be 1m3H, the air inlet intermittent time is 3min, and the air inlet temperature is 50 ℃; the purification adsorbent is a commercially available activated carbon adsorbent;
s22, regulating the pressure of the primary purified marsh gas obtained in the step S21 to 1.0MPa, intermittently introducing the primary purified marsh gas into a secondary adsorption tower 5, and utilizing the purification adsorbent filled in the secondary adsorption tower 5 to carry out CO purification on the compressed marsh gas2Adsorbing to obtain purified methane; wherein the flow of the primary purified biogas is controlled to be 2m3The air inlet intermittent time is 2min, and the air inlet temperature is 150 ℃; the purification adsorbent is a commercially available activated carbon adsorbent;
s3, desorption and regeneration;
when CO is adsorbed in the first-stage adsorption tower 42When saturation is reached, the compressed methane is stopped from being introduced into the first-stage adsorption tower 4, and the first-stage adsorption tower 4 and the second-stage adsorption tower 5 are vacuumized, so that CO adsorbed on the purification adsorbent in the first-stage adsorption tower 4 and the second-stage adsorption tower 5 is adsorbed on the purification adsorbent2And desorbing the gas, releasing the gas and realizing the regeneration of the purification adsorbent.
Example 5: a method for efficiently purifying biogas by using a pressure swing adsorption principle comprises the following steps:
s1, preprocessing;
s11, introducing the biogas generated after anaerobic fermentation into a desulfurizing tower 1, and removing sulfides in the biogas by using a desulfurizing agent in the desulfurizing tower 1, wherein in the step S11, the desulfurizing agent is composed of the following raw materials in parts by weight: 22 parts of organic amine desulfurizer, 13 parts of sulfoxide, 7 parts of polyethylene glycol, 13 parts of propylene carbonate and 35 parts of deionized water, and the desulfurizer prepared according to the proportion has a longer service cycle, so that the replacement frequency of the desulfurizer is reduced, and the economic benefit is improved; the preparation method of the desulfurizer comprises the following steps: mixing and reacting an organic amine desulfurizer with sulfoxide and polyethylene glycol, and controlling the pH value of the reaction to be 7 to generate colloidal precipitate; oxidizing the colloidal precipitate with oxygen-enriched gas, and filtering; washing the filtered precipitate with water for 4 times, uniformly mixing the precipitate with propylene carbonate and deionized water, carrying out extrusion forming on the mixed material on a forming machine, and naturally drying to obtain the desulfurizer; the desulfurizer removes sulfides in the biogas, relieves the pressure in the aspect of environmental protection, and simultaneously improves the quality of the biogas;
s12, introducing the biogas desulfurized in the step S11 into a drying tower 2, and removing water in the desulfurized biogas to ensure that the water content of the desulfurized biogas is 3mg/kg, thereby obtaining dry biogas; the drying agent used in the drying tower 2 is a composite drying agent which is compounded by the following raw materials in parts by weight: 33 parts of magnesium sulfate, 21 parts of sodium carbonate, 20 parts of calcium chloride, 23 parts of calcium carbonate, 19 parts of calcium hydride and 18 parts of deionized water; the drying agent in the proportion can dry various impurity gases in the biogas, and has higher drying efficiency;
s13, introducing the dried biogas obtained in the step S12 into a filter tower 3, and removing insoluble impurities in the dried biogas; regulating the pressure of the outlet gas of the filter tower 3 to 1.0MPa to obtain compressed methane; the filter membrane in the filter tower 3 is a polyvinylidene fluoride hollow fiber membrane;
s2, pressure swing adsorption;
s21, intermittently introducing the compressed marsh gas obtained in the step S13 into the primary adsorption tower 4, and utilizing the purification adsorbent filled in the primary adsorption tower 4 to treat CO in the compressed marsh gas2Carrying out adsorption to obtain primary purified methane; wherein the flow of the compressed methane is controlled to be 3m3H, the air inlet intermittent time is 5min, and the air inlet temperature is 150 ℃; the purification adsorbent is composed of the following raw materials in parts by weight: 15 parts of aluminum oxide, 5 parts of carbon molecular sieve, 8 parts of sodium sulfate, 10 parts of zeolite and 25 parts of deionized water, wherein the carbon dioxide gas in the purified adsorbent methane has better adsorption performance in the proportion, no by-product is generated in the adsorption process, and the adsorption efficiency of the carbon dioxide adsorbent is improved; the preparation method of the purification adsorbent comprises the following steps: 1. adding deionized water into a hydrothermal kettle, then adding alumina and a carbon molecular sieve into the hydrothermal kettle, and uniformly stirring; 2. preparing sodium sulfate into a salt solution, and adding the salt solution into a hydrothermal kettle; 3. finally, adding zeolite into a hydrothermal kettle for reaction, controlling the temperature of the hydrothermal kettle to be 90 ℃, and the reaction time to be 20min, and cooling the reaction material after the reaction is finished to obtain the purified adsorbent;
s22, step S21 the pressure of the obtained primary purified marsh gas is regulated to 1.5MPa, then the marsh gas is intermittently introduced into a secondary adsorption tower 5, and CO in the compressed marsh gas is treated by using a purification adsorbent filled in the secondary adsorption tower 52Adsorbing to obtain purified methane; wherein, the flow of the primary purified biogas is controlled to be 5m3The air inlet intermittent time is 3min, and the air inlet temperature is 250 ℃;
s3, desorption and regeneration;
when CO is adsorbed in the first-stage adsorption tower 42When saturation is reached, the compressed methane is stopped from being introduced into the first-stage adsorption tower 4, and the first-stage adsorption tower 4 and the second-stage adsorption tower 5 are vacuumized, so that CO adsorbed on the purification adsorbent in the first-stage adsorption tower 4 and the second-stage adsorption tower 5 is adsorbed on the purification adsorbent2And desorbing the gas, releasing the gas and realizing the regeneration of the purification adsorbent.
Example 6: a method for efficiently purifying biogas by using a pressure swing adsorption principle comprises the following steps:
s1, preprocessing;
s11, introducing the biogas generated after anaerobic fermentation into a desulfurizing tower 1, and removing sulfides in the biogas by using a desulfurizing agent in the desulfurizing tower 1, wherein in the step S11, the desulfurizing agent is composed of the following raw materials in parts by weight: 22 parts of organic amine desulfurizer, 11 parts of sulfoxide, 6 parts of polyethylene glycol, 12 parts of propylene carbonate and 35 parts of deionized water, and the desulfurizer prepared according to the proportion has a longer service cycle, so that the replacement frequency of the desulfurizer is reduced, and the economic benefit is improved; the preparation method of the desulfurizer comprises the following steps: mixing and reacting an organic amine desulfurizer with sulfoxide and polyethylene glycol, and controlling the pH value of the reaction to be 7 to generate colloidal precipitate; oxidizing the colloidal precipitate with oxygen-enriched gas, and filtering; washing the filtered precipitate with water for 3 times, uniformly mixing with propylene carbonate and deionized water, carrying out extrusion forming on the mixed material on a forming machine, and naturally drying to obtain the desulfurizer; the desulfurizer removes sulfides in the biogas, relieves the pressure in the aspect of environmental protection, and simultaneously improves the quality of the biogas;
s12, introducing the biogas desulfurized in the step S11 into a drying tower 2, and removing water in the desulfurized biogas to ensure that the water content of the desulfurized biogas is 2mg/kg, thereby obtaining dry biogas; the drying agent used in the drying tower 2 is a composite drying agent which is compounded by the following raw materials in parts by weight: 26 parts of magnesium sulfate, 18 parts of sodium carbonate, 16 parts of calcium chloride, 15 parts of calcium carbonate, 16 parts of calcium hydride and 25 parts of deionized water; the drying agent in the proportion can dry various impurity gases in the biogas, and has higher drying efficiency;
s13, introducing the dried biogas obtained in the step S12 into a filter tower 3, and removing insoluble impurities in the dried biogas; regulating the pressure of the outlet gas of the filter tower 3 to 0.8MPa to obtain compressed methane; the filter membrane in the filter tower 3 is a polyamide fiber membrane;
s2, pressure swing adsorption;
s21, intermittently introducing the compressed marsh gas obtained in the step S13 into the primary adsorption tower 4, and utilizing the purification adsorbent filled in the primary adsorption tower 4 to treat CO in the compressed marsh gas2Carrying out adsorption to obtain primary purified methane; wherein the flow of the compressed methane is controlled to be 2m3The air inlet intermittent time is 4min, and the air inlet temperature is 80 ℃; the purification adsorbent is composed of the following raw materials in parts by weight: 22 parts of aluminum oxide, 13 parts of carbon molecular sieve, 15 parts of sodium sulfate, 19 parts of zeolite and 30 parts of deionized water, wherein the carbon dioxide gas in the purified adsorbent in the proportion has better adsorption performance, no by-product is generated in the adsorption process, and the adsorption efficiency of the carbon dioxide adsorbent is improved; the preparation method of the purification adsorbent comprises the following steps: 1. adding deionized water into a hydrothermal kettle, then adding alumina and a carbon molecular sieve into the hydrothermal kettle, and uniformly stirring; 2. preparing sodium sulfate into a salt solution, and adding the salt solution into a hydrothermal kettle; 3. finally, adding zeolite into a hydrothermal kettle for reaction, controlling the temperature of the hydrothermal kettle at 110 ℃, and the reaction time at 40min, and cooling the reaction material after the reaction is finished to obtain a purified adsorbent;
s22, regulating the pressure of the primary purified marsh gas obtained in the step S21 to 1.5MPa, intermittently introducing the primary purified marsh gas into a secondary adsorption tower 5, and utilizing the purification adsorbent filled in the secondary adsorption tower 5 to carry out CO purification on the compressed marsh gas2Adsorbing to obtain purified methane; wherein, the flow of the primary purified biogas is controlled to be 4m3H, intermittent air intake time of 2min, and air intake temperatureThe temperature is 150 ℃;
s3, desorption and regeneration;
when CO is adsorbed in the first-stage adsorption tower 42When saturation is reached, the compressed methane is stopped from being introduced into the first-stage adsorption tower 4, and the first-stage adsorption tower 4 and the second-stage adsorption tower 5 are vacuumized, so that CO adsorbed on the purification adsorbent in the first-stage adsorption tower 4 and the second-stage adsorption tower 5 is adsorbed on the purification adsorbent2And desorbing the gas, releasing the gas and realizing the regeneration of the purification adsorbent.
The apparatus for efficiently purifying biogas used in the above embodiments 1 to 6, as shown in fig. 1, 2, 3 and 4, comprises a desulfurizing tower 1, a drying tower 2, a filtering tower 3, a primary adsorption tower 4 and a secondary adsorption tower 5; the desulfurization tower comprises a desulfurization tower 1, a drying tower 2, a filtering tower 3, a primary adsorption tower 4 and a secondary adsorption tower 5 which are sequentially connected through a conduit, a Roots blower 10 and a desulfurization component 11 are sequentially arranged in the desulfurization tower 1 from top to bottom, an air outlet of the Roots blower 10 is connected with the drying tower 2 through a conduit, an air inlet 12 is formed in the lower end of the side wall of the desulfurization tower 1, the desulfurization component 11 comprises a fixed sleeve 110, a vent plate 111 and a desulfurizer carrier frame 112, the fixed sleeve 110 is vertically arranged in the desulfurization tower 1, the vent plate 111 and the desulfurizer carrier frame 112 are sequentially sleeved on the fixed sleeve 110, the vent plate 111 is located at the lower end of the desulfurizer carrier frame 112, and a desulfurizer is arranged; 4 air-permeable plates 111 and a desulfurizer carrier frame 112 are arranged in pairs, and by arranging the 4 air-permeable plates 111 and the desulfurizer carrier frame 112, the contact time of the biogas and a desulfurizer is prolonged, and further the desulfurization effect of the biogas is improved; the drying tower 2 is internally provided with a drying agent placing rack 20, the drying agent placing rack 20 comprises an outer sleeve 200 and an inner sleeve 201, the inner sleeve 201 is sleeved inside the outer sleeve 200, the inner sleeve 201 and the outer sleeve 200 are provided with connecting plates 202, the connecting plates 202 are provided with 5-8 groups in pairs, the 5-8 groups of connecting plates 202 divide the area enclosed by the inner sleeve 200 and the outer sleeve 201 into 5-8 drying areas 203 and air inlet areas 204, each connecting plate 202 is provided with an opening, and a drying agent is arranged inside each drying area 203; the filter core 30 is arranged in the filter tower 3, the upper end and the lower end of the filter core 30 are respectively fixedly connected with the filter tower 3 through the mounting plate 31, the lower end of the filter core 30 is closed, the upper end of the filter core penetrates through the mounting plate 31, the mounting plate 31 at the lower end of the filter tower 3 is uniformly provided with the through holes 310, the filter cores 30 are arranged in 7 number, the 7 filter cores 30 are uniformly distributed between the two mounting plates 31, and the air inflow of the filter core 30 in unit time is improved and the methane filtering effect is improved by arranging the 7 filter cores 30; the through holes 310 are located on the outer side of the filter element 30; both ends all are provided with even gas board 40 about 4 inside of one-level adsorption tower, it places net section of thick bamboo 41 to be provided with between two even gas boards 40, it is provided with the purification adsorbent to place the inside net section of thick bamboo 41, 4 upper ends of one-level adsorption tower are provided with desorption mouth 42, be provided with control valve 420 on the desorption mouth 42, second grade adsorption tower 5 is the same with the structure of one-level adsorption tower 4, be provided with gas vent 50 on the second grade adsorption tower 5, set up control valve 420 on the gas vent 50, and second grade adsorption tower 5, all be provided with control valve 420 on the connecting tube between one-level adsorption tower 4 and the filter tower 3.
Test example: the indexes of the pure methane obtained in the examples 1 to 6 are respectively detected, and the detection results are shown in table 1:
table 1 change of each index in the purified biogas under different reaction conditions;
Figure GDA0002952858640000141
as can be seen from Table 1, the process of the invention can effectively remove CO from biogas2And H2S gas, corrosion of impurity gas to equipment is reduced; meanwhile, the concentration of methane in the biogas is improved, and the economic benefit is improved.

Claims (2)

1. A method for efficiently purifying biogas by using a pressure swing adsorption principle is characterized by comprising the following steps:
s1, preprocessing;
s11, introducing the biogas generated after anaerobic fermentation into a desulfurizing tower (1), and removing sulfides in the biogas by using a desulfurizing agent in the desulfurizing tower (1);
s12, introducing the biogas desulfurized in the step S11 into a drying tower (2), removing water in the desulfurized biogas to enable the water content of the desulfurized biogas to be 2-9 mg/kg, and obtaining dry biogas;
s13, introducing the dried biogas obtained in the step S12 into a filter tower (3), and removing insoluble impurities in the dried biogas; regulating the pressure of the outlet gas of the filter tower (3) to 0.5-1.0 MPa to obtain compressed methane;
s2, pressure swing adsorption;
s21, intermittently introducing the compressed marsh gas obtained in the step S13 into the primary adsorption tower (4), and using the purification adsorbent filled in the primary adsorption tower (4) to carry out CO treatment on the compressed marsh gas2Carrying out adsorption to obtain primary purified methane; wherein the flow of the compressed methane is controlled to be 1-3 m3The air inlet intermittent time is 3-5 min, and the air inlet temperature is 50-150 ℃;
s22, regulating the pressure of the primary purified biogas obtained in the step S21 to 1.0-1.5 MPa, intermittently introducing the primary purified biogas into a secondary adsorption tower (5), and using a purification adsorbent filled in the secondary adsorption tower (5) to carry out CO treatment on the compressed biogas2Adsorbing to obtain purified methane; wherein the flow of the primary purified biogas is controlled to be 2-5 m3The air inlet intermittent time is 1-3 min, and the air inlet temperature is 150-250 ℃;
s3, desorption and regeneration;
when CO is adsorbed in the first-stage adsorption tower (4)2When saturation is reached, stopping introducing the compressed methane into the first-stage adsorption tower (4), and simultaneously carrying out vacuumizing operation on the first-stage adsorption tower (4) and the second-stage adsorption tower (5) to ensure that CO adsorbed on the purification adsorbent in the first-stage adsorption tower (4) and the second-stage adsorption tower (5) is absorbed in the purification adsorbent2Desorbing the gas, releasing the gas and realizing the regeneration of the purification adsorbent;
in step S11, the desulfurizing agent is composed of the following raw materials in parts by weight: 15-30 parts of organic amine desulfurizer, 8-15 parts of sulfoxide, 1-8 parts of polyethylene glycol, 5-16 parts of propylene carbonate and 20-35 parts of deionized water;
the preparation method of the desulfurizer comprises the following steps: mixing and reacting an organic amine desulfurizer with sulfoxide and polyethylene glycol, and controlling the pH value of the reaction to be 6-8 to generate colloidal precipitate; oxidizing the colloidal precipitate with oxygen-enriched gas, and then filtering and separating; washing the filtered precipitate for 2-5 times, uniformly mixing the precipitate with propylene carbonate and deionized water, carrying out extrusion forming on the mixed material on a forming machine, and naturally drying to obtain the desulfurizer;
in the step S12, the drying agent used in the drying tower (2) is a composite drying agent, and the composite drying agent is compounded by the following raw materials in parts by weight: 16-33 parts of magnesium sulfate, 12-21 parts of sodium carbonate, 10-20 parts of calcium chloride, 8-23 parts of calcium carbonate, 7-19 parts of calcium hydride and 10-25 parts of deionized water;
in the step S13, the filter membrane in the filter tower (3) is one of a polyamide fiber membrane, a polyimide hollow fiber membrane and a polyvinylidene fluoride hollow fiber membrane;
in step S21, the purification adsorbent is composed of the following raw materials in parts by weight: 15-26 parts of alumina, 5-18 parts of carbon molecular sieve, 8-17 parts of sodium sulfate, 10-23 parts of zeolite and 18-30 parts of deionized water.
2. The device for efficiently purifying the biogas by using the pressure swing adsorption principle, which is suitable for the device of claim 1, is characterized by comprising a desulfurizing tower (1), a drying tower (2), a filtering tower (3), a primary adsorption tower (4) and a secondary adsorption tower (5); the desulfurizing tower (1), the drying tower (2), the filtering tower (3), the first-stage adsorption tower (4) and the second-stage adsorption tower (5) are sequentially connected through a conduit, a Roots blower (10) and a desulfurizing component (11) are sequentially arranged in the desulfurizing tower (1) from top to bottom, the air outlet of the Roots blower (10) is connected with the drying tower (2) through a guide pipe, the lower end of the side wall of the desulfurizing tower (1) is provided with an air inlet (12), the desulfurization component (11) comprises a fixed sleeve (110), a ventilation plate (111) and a desulfurizer carrier frame (112), the fixed sleeve (110) is vertically arranged inside the desulfurizing tower (1), the air permeable plate (111) and the desulfurizing agent carrier frame (112) are sequentially sleeved on the fixed sleeve (110), the air permeable plate (111) is positioned at the lower end of the desulfurizer carrier frame (112), and a desulfurizer is arranged on the desulfurizer carrier frame (112); the drying tower (2) is internally provided with a drying agent placing frame (20), the drying agent placing frame (20) comprises an outer sleeve (200) and an inner sleeve (201), the inner sleeve (201) is sleeved inside the outer sleeve (200), the inner sleeve (201) and the outer sleeve (200) are provided with connecting plates (202), the connecting plates (202) are provided with 5-8 groups in pairs, the area surrounded by the inner sleeve (200) and the outer sleeve (201) is divided into 5-8 drying areas (203) and air inlet areas (204) by the 5-8 groups of connecting plates (202), each connecting plate (202) is provided with an opening, and drying agents are arranged inside the drying areas (203); a filter element (30) is arranged in the filter tower (3), the upper end and the lower end of the filter element (30) are fixedly connected with the filter tower (3) through mounting plates (31), the lower end of the filter element (30) is closed, the upper end of the filter element penetrates through the mounting plates (31), through holes (310) are uniformly formed in the mounting plates (31) at the lower end of the filter tower (3), and the through holes (310) are positioned on the outer side of the filter element (30); the upper end and the lower end of the interior of the primary adsorption tower (4) are respectively provided with an air homogenizing plate (40), a placing net cylinder (41) is arranged between the two air homogenizing plates (40), a purifying adsorbent is arranged in the placing net cylinder (41), the upper end of the primary adsorption tower (4) is provided with a desorption port (42), the desorption port (42) is provided with a control valve (420), the secondary adsorption tower (5) and the primary adsorption tower (4) have the same structure, the secondary adsorption tower (5) is provided with an exhaust port (50), the exhaust port (50) is provided with the control valve (420), and connecting pipes among the secondary adsorption tower (5), the primary adsorption tower (4) and the filter tower (3) are respectively provided with the control valve (420);
the number of the air permeable plates (111) and the number of the desulfurizer carrier frames (112) are 3-6;
the number of the filter cores (30) is 5-8, and the 5-8 filter cores (30) are uniformly distributed between the two mounting plates (31);
3-6 desulfurizer carrier frames (112) are arranged in pairs.
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