CN219586052U - Membrane method biogas purification system for leachate treatment - Google Patents
Membrane method biogas purification system for leachate treatment Download PDFInfo
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- CN219586052U CN219586052U CN202320926201.9U CN202320926201U CN219586052U CN 219586052 U CN219586052 U CN 219586052U CN 202320926201 U CN202320926201 U CN 202320926201U CN 219586052 U CN219586052 U CN 219586052U
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Abstract
The utility model discloses a membrane biogas purification system for percolate treatment, which comprises a Roots blower, a first pretreatment unit, a second pretreatment unit, a heater and a purification separation unit which are sequentially connected, wherein the first pretreatment unit comprises a demister and a desulfurization tank which are sequentially connected, the second pretreatment unit comprises a compressor, a cold dryer, a gas-liquid separator, a carbon adsorption tank, a primary precise filter and a secondary precise filter which are sequentially connected, a heater air outlet is connected with a first return pipeline in parallel, the purification separation unit comprises a primary membrane separator and a secondary membrane separator, a non-permeate gas outlet of the primary membrane separator is connected with an air inlet of the secondary membrane separator, a permeate gas outlet of the secondary membrane separator is connected with a second return pipeline in parallel, the first return pipeline and the second return pipeline are connected to an air inlet of the compressor, the non-permeate gas outlet of the secondary membrane separator is connected to a pressure-regulating and odorizing device, the outlet of the pressure-regulating odorizing device is connected to town gas pipe network, and the resource recycling rate is high.
Description
Technical Field
The utility model relates to the technical field of garbage treatment, in particular to a membrane method biogas purification system for leachate treatment.
Background
The garbage leachate treatment process has a medium-temperature anaerobic system process section, and a large amount of metabolite biogas (methane content is 65% -70%) is generated in the process of removing organic matters, and the biogas is generally burnt by a burner, so that the garbage leachate treatment process is safer but has no economy, is energy-saving and consumption-reducing call for corresponding countries, and has great practical significance in purifying biogas into natural gas resources for recycling.
Disclosure of Invention
The utility model aims to provide a membrane method biogas purification system for leachate treatment, which has high working efficiency and high resource recycling rate.
The purpose of the utility model is realized in the following way: a membrane method marsh gas purification system for leachate treatment comprises a Roots blower, a first pretreatment unit, a second pretreatment unit, a heater and a purification separation unit which are sequentially connected through a forward flow pipeline, wherein the first pretreatment unit comprises a demister and a desulfurizing tank which are sequentially connected, the second pretreatment unit comprises a compressor, a cold dryer, a gas-liquid separator, a carbon adsorption tank, a first-stage precise filter and a second-stage precise filter which are sequentially connected, a heater air outlet is connected with a first return pipeline in parallel, the first return pipeline is connected to a compressor air inlet, the purification separation unit comprises a first-stage membrane separator and a second-stage membrane separator, the first-stage membrane separator and the second-stage membrane separator both comprise a permeate gas outlet and a non-permeate gas outlet, the permeate gas outlet of the first-stage membrane separator is connected with a carbon dioxide buffer tank, the permeate gas outlet of the second-stage membrane separator is connected with a second return pipeline in parallel, the non-permeate gas outlet of the second-stage membrane separator is connected with a compressor air inlet, the non-permeate gas outlet of the second-stage membrane separator is connected with a pressure regulating odorizing device, and the outlet of the pressure regulating odorizing device is connected with town gas.
The utility model relates to a membrane method biogas purification system for percolate treatment, which comprises a first pretreatment unit, sequentially delivering crude biogas from a biogas pool to a demister and a desulfurizing tank through a Roots blower, removing liquid drops in the demister, preventing liquid water from blocking desulfurizing agent micropores and damaging desulfurizing agent strength, delivering the crude biogas subjected to preliminary dewatering to the desulfurizing tank to complete removal of hydrogen sulfide, completing preliminary purification, then delivering the crude biogas to a second pretreatment unit, sequentially carrying out pressurization, cooling and drying treatment, deeply removing peculiar smell such as ammonia and oil in compressed biogas through a carbon adsorption tank, deeply dedusting and deoiling through a primary precise filter and a secondary precise filter, thereby obtaining dry, oilless and clean gas, heating the dry, oilless and clean gas through a heater to a temperature meeting the working condition of a purification and separation unit, and delivering the dry, oilless and clean gas to a purification and separation unit, and obtaining product gas (CO) through two-stage separation of a primary membrane separator and a secondary membrane separator 2 The concentration is below 3%, the methane recovery rate is more than or equal to 95%, the methane enters into a town gas pipe network through a pressure regulating and odorizing device, carbon dioxide separated from a primary membrane separator (the pressure is about 0.01 MPa) can be collected and utilized after being collected through a pipeline and discharged into the atmosphere through a carbon dioxide buffer tank, and other reflux discharged from a permeate gas outlet separated from the primary membrane separator flows to a second pretreatment unit for further purification, so that the gas production effect is improved.
As a further improvement of the utility model, the downstream pipeline, the first return pipeline and the second return pipeline are all provided with electric control valves, the air outlet of the heater is provided with a first pressure sensor and a first temperature sensor, and the electric control valves, the first pressure sensor and the first temperature sensor are connected with a control system. The control system can ensure whether the gas exhausted by the heater meets the condition of entering the purification and separation unit according to the signals fed back by the first pressure sensor and the first temperature sensor, if so, the electric control valve leading to the purification and separation unit is controlled to be opened, and if not, the electric control valve leading to the first return pipeline is controlled to be closed, and the electric control valve leading to the first return pipeline is controlled to be opened, so that the gas return is subjected to compression, drying and purification treatment again, and the gas quality is ensured.
As a further improvement of the utility model, the first-stage membrane separator and the second-stage membrane separator are respectively provided with a second temperature sensor and a second pressure sensor, and the second temperature sensor and the second pressure sensor are connected with an alarm device, so that the use safety is ensured.
As a further improvement of the utility model, the desulfurizing tank and the compressor comprise two parallel connection units, so that one unit can be used for one unit, and the equipment maintenance is convenient.
As a further improvement of the utility model, the filtering precision of the primary precise filter is 1um, the filtering precision of the secondary precise filter is 0.01um, the primary precise filter is used for further removing oil and dust particles adsorbed by the activated carbon, and the secondary precise filter is used for carrying out more precise dust removal and oil removal treatment on the compressed methane, so that dry, oilless and clean gas is obtained.
As a further improvement of the utility model, the temperature of the outlet gas of the heater is 70 ℃, so that the working condition of the purification and separation unit is ensured to be met.
As a further improvement of the utility model, the desulfurization tank is a dry desulfurization tank, the process is simple, the problems of sewage and acid treatment are avoided, and the energy consumption is low.
As a further improvement of the utility model, the compressor is a variable frequency compressor, so that constant pressure supply is ensured, and the compressor is efficient and energy-saving.
Drawings
FIG. 1 is a schematic diagram of a membrane biogas purification system for leachate treatment according to the present utility model.
The system comprises a Roots blower, a demister 2, a desulfurizing tank 3, a compressor 4, a cold dryer 5, a gas-liquid separator 6, a carbon adsorption tank 7, a primary precise filter 8, a secondary precise filter 9, a heater 10, a primary membrane separator 11, a secondary membrane separator 12, a pressure-regulating and deodorizing device 13, a town gas pipe network 14 and a carbon dioxide buffer tank 15.
Description of the embodiments
The membrane biogas purification system for percolate treatment shown in fig. 1 comprises a Roots blower 1, a first pretreatment unit, a second pretreatment unit, a heater 10 and a purification and separation unit which are sequentially connected through a downstream pipeline.
Wherein, first pretreatment unit includes defroster 2 and the digester 3 that connect gradually. The desulfurizing tank 3 is a dry desulfurizing tank 3, the process is simple, the problems of sewage and acid treatment are avoided, and the energy consumption is low. In the first pretreatment unit, crude biogas from a biogas digester is sequentially sent to a demister 2 and a desulfurization tank 3 through a Roots blower 1, liquid drops are removed in the demister 2, liquid water is prevented from blocking micropores of a desulfurizing agent, strength of the desulfurizing agent is damaged, and the crude biogas subjected to preliminary water removal enters the desulfurization tank 3 to complete removal of hydrogen sulfide, so that preliminary purification is completed.
The second pretreatment unit comprises a compressor 4, a cold dryer 5, a gas-liquid separator 6, a carbon adsorption tank 7, a primary precise filter 8 and a secondary precise filter 9 which are connected in sequence. The compressor 4 is a variable frequency compressor 4, so that constant pressure supply is ensured, and the efficiency and energy conservation are realized. The cooling dryer 5 cools the methane, and reduces the temperature of the methane from 40 ℃ to 5 ℃ to the dew point, and the outlet temperature is 20 ℃. After cooling, the condensed liquid drops are removed by a gas-liquid separator 6. And in the second pretreatment unit, the other primary purification is completed, pressurization, cooling and drying are sequentially carried out, peculiar smell such as ammonia and oil in the compressed methane is deeply removed through the carbon adsorption tank 7, and then the deep dust and oil are removed through the primary precise filter 8 and the secondary precise filter 9, so that the dry, oilless and clean gas is obtained. The filtering precision of the primary precise filter 8 is 1um, the filtering precision of the secondary precise filter 9 is 0.01um, dust particles adsorbed by active carbon are removed by the primary precise filter 8, and the compressed marsh gas is subjected to more precise dust removal and oil removal treatment by the secondary precise filter 9, so that dry, oilless and clean gas is obtained.
Heater 10 is used to heat the gas to meet the operating conditions of the purification and separation unit, specifically, the heater 10 exit gas temperature is 70 ℃. The air outlet of the heater 10 is connected with a first return pipeline in parallel, and the first return pipeline is connected to the air inlet of the compressor 4.
The purification and separation unit comprises a primary membrane separator 11 and a secondary membrane separator 12. The first-stage membrane separator 11 and the second-stage membrane separator 12 both comprise a permeate gas outlet and a non-permeate gas outlet, the permeate gas outlet of the first-stage membrane separator 11 is connected with the carbon dioxide buffer tank 15, the non-permeate gas outlet of the first-stage membrane separator 11 is connected with the air inlet of the second-stage membrane separator 12, the permeate gas outlet of the second-stage membrane separator 12 is connected with a second return pipeline in parallel, the second return pipeline is connected to the air inlet of the compressor 4, the non-permeate gas outlet of the second-stage membrane separator 12 is connected to the pressure-regulating odorizing device 13, and the outlet of the pressure-regulating odorizing device 13 is connected to the town gas pipe network 14. The product gas is obtained after two-stage separation of the primary membrane separator 11 and the secondary membrane separator 12, the product gas enters into the town gas pipe network 14 through the pressure regulating and odorizing device 13, the carbon dioxide separated from the primary membrane separator 11 can be collected through the pipeline and then is utilized or discharged into the atmosphere after being collected by the carbon dioxide buffer tank 15, and other materials discharged from the permeate gas outlet separated from the primary membrane separator 11 flow back to the second pretreatment unit for further purification, so that the gas production effect is improved.
The downstream pipeline, the first return pipeline and the second return pipeline are all provided with electric control valves, the air outlet of the heater 10 is provided with a first pressure sensor and a first temperature sensor, and the electric control valves, the first pressure sensor and the first temperature sensor are connected with a control system. Therefore, the control system can ensure whether the gas exhausted by the heater 10 meets the condition of entering the purification and separation unit according to the signals fed back by the first pressure sensor and the first temperature sensor, if so, the electric control valve leading to the purification and separation unit is controlled to be opened, and if not, the electric control valve leading to the first return line is controlled to be closed, and the electric control valve leading to the first return line is controlled to be opened, so that the gas return is subjected to compression, drying and purification treatment again, and the product quality is ensured. The first-stage membrane separator 11 and the second-stage membrane separator 12 are respectively provided with a second temperature sensor and a second pressure sensor, and the second temperature sensor and the second pressure sensor are connected with a control system and an alarm device, so that the use safety is ensured.
The desulfurizing tank 3 and the compressor 4 comprise two parallel connection units, so that one unit can be used for one unit, and the equipment maintenance is convenient.
The membrane method biogas purification system for percolate treatment of the embodiment has the following using effects:
(1) Feed gas conditions
Raw material air source: coarse biogas;
raw material gas amount: 15000 Nm/d;
raw material gas temperature: 10-50 ℃;
feed gas pressure: 1-1.5kPa (+ -10%);
raw material gas components: CH (CH) 4 （75.9%），CO 2 （23.8%），H 2 S（0.16%），NH 3 （60ppm），N 2 （0.12%），O 2 （0.02%）。
(2) The technical indexes of the product gas obtained by the system are as follows:
product gas CO 2 The purity is less than or equal to 3 percent;
CH 4 the recovery rate is more than or equal to 95 percent;
the air pressure of the product is more than or equal to 0.2MPa (G) and less than or equal to 0.3MPa (G);
the content of hydrogen sulfide is less than or equal to 20mg/m 3 ；
The product gas meets the requirements of the second class of natural gas in the GB17820-2012 Natural gas standard.
The utility model is not limited to the above embodiments, and based on the technical solution disclosed in the utility model, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the utility model.
Claims (7)
1. A embrane method marsh gas purification system for leachate treatment, its characterized in that: the purification and separation unit comprises a Roots blower, a first pretreatment unit, a second pretreatment unit, a heater and a purification and separation unit which are sequentially connected through forward flow pipelines, wherein the first pretreatment unit comprises a demister and a desulfurizing tank which are sequentially connected, the second pretreatment unit comprises a compressor, a cold dryer, a gas-liquid separator, a carbon adsorption tank, a primary precise filter and a secondary precise filter which are sequentially connected, a first return pipeline is connected with an air outlet of the heater in parallel, the first return pipeline is connected to an air inlet of the compressor, the purification and separation unit comprises a primary membrane separator and a secondary membrane separator, the primary membrane separator and the secondary membrane separator both comprise a permeate gas outlet and a non-permeate gas outlet, the permeate gas outlet of the primary membrane separator is connected with a carbon dioxide buffer tank, the non-permeate gas outlet of the primary membrane separator is connected with an air inlet of the secondary membrane separator, the permeate gas outlet of the secondary membrane separator is connected with a second return pipeline in parallel, the second return pipeline is connected to an air inlet of the compressor, and the non-permeate gas outlet of the secondary membrane separator is connected to a pressure regulating and adding device, and the pressure regulating and adding device is connected to a town gas pipe network.
2. The membrane biogas purification system for leachate treatment of claim 1, wherein: the electric control valve, the first pressure sensor and the first temperature sensor are connected with the control system.
3. The membrane biogas purification system for leachate treatment of claim 2, wherein: the first-stage membrane separator and the second-stage membrane separator are respectively provided with a second temperature sensor and a second pressure sensor, and the second temperature sensor and the second pressure sensor are connected with an alarm device.
4. The membrane biogas purification system for leachate treatment of claim 1, wherein: the desulfurizing tank and the compressor comprise two parallel connection units.
5. The membrane biogas purification system for leachate treatment of claim 1, wherein: the filtering precision of the primary precise filter is 1um, and the filtering precision of the secondary precise filter is 0.01um.
6. The membrane biogas purification system for leachate treatment according to any one of claims 1-5, wherein: the desulfurization tank is a dry desulfurization tank.
7. The membrane biogas purification system for leachate treatment according to any one of claims 1-5, wherein: the compressor is a variable frequency compressor.
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| CN202320926201.9U CN219586052U (en) | 2023-04-23 | 2023-04-23 | Membrane method biogas purification system for leachate treatment |
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| CN202320926201.9U CN219586052U (en) | 2023-04-23 | 2023-04-23 | Membrane method biogas purification system for leachate treatment |
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