CN217628265U - Cooling pipeline and biogas purification device decarbonization system - Google Patents
Cooling pipeline and biogas purification device decarbonization system Download PDFInfo
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- CN217628265U CN217628265U CN202221241666.2U CN202221241666U CN217628265U CN 217628265 U CN217628265 U CN 217628265U CN 202221241666 U CN202221241666 U CN 202221241666U CN 217628265 U CN217628265 U CN 217628265U
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Abstract
The utility model provides a cooling line and marsh gas purifier decarbonization system, include: the system comprises a methane decarbonization pipeline, an oil cooler, a first heat exchanger, a water source heat pump and a second heat exchanger; a screw pre-pressurization device, a pre-cooler, a freeze dryer, a gas purification device and a gas heating device are arranged in the methane decarburization pipeline; the screw rod pre-pressurization and the oil cooler are connected to form a lubricating oil loop; the oil cooler and the first heat exchanger are connected to form a cooling water loop; the first port of the second heat exchanger is connected with the third port of the water source heat pump, and the first port of the water source heat pump is respectively connected with the third port of the precooler and the third port of the freeze dryer; the second port of the water source heat pump, the fourth port of the precooler and the fourth port of the freeze dryer are all connected to the third port of the gas heating, and the fourth port of the gas heating is connected with the second port of the second heat exchanger. The utility model discloses a helical-lobe compressor's heat has been retrieved completely to first heat exchanger.
Description
Technical Field
The utility model relates to a cooling line specifically, relates to cooling line and marsh gas purifier decarbonization system.
Background
The biogas is a combustible mixed gas produced by microorganisms, the main components of the biogas are 50-75% of methane, 25-45% of carbon dioxide and a small amount of hydrogen sulfide, carbon monoxide, nitrogen, oxygen and the like, and the purification of the biogas is mainly to remove the hydrogen sulfide, the carbon dioxide, the carbon monoxide and water vapor in the biogas so as to eliminate the harmful gases and water in the biogas from pipelines, gas storage tanks and factors influencing the use of the biogas. At present, a cooling system for biogas purification can cool a purification system, but the heat energy cannot be recycled, so that a large amount of heat energy is wasted, and therefore a cooling pipeline with a heat energy recovery function needs to be designed.
Patent document CN104498119a discloses a biogas purification method, which relates to the technical field of energy processing; comprises the steps of filtering, drying, desulfurizing, compressing, first cooling, purifying, last cooling, collecting and the like.
Patent document CN103897760a provides a biogas purification system, which includes: a gas storage tank; the circulating water system comprises a multi-stage desorption tower and a reservoir, wherein the reservoir is provided with a first reservoir water inlet and a first reservoir water outlet, and the first reservoir water inlet, the first reservoir water outlet and a final stage desorption tower in the multi-stage desorption tower form a first circulating loop; and a first end of the return pipeline is connected with the gas storage tank, a second end of the return pipeline is connected with the final-stage desorption tower, and the return pipeline is provided with a switch valve.
The current prior patents fail to realize a cooling circuit with a heat energy recovery function.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims at providing a cooling pipeline and a decarbonization system of a methane purification device.
According to the utility model provides a pair of cooling pipeline, include: the system comprises a methane decarbonization pipeline, an oil cooler, a first heat exchanger, a water source heat pump and a second heat exchanger;
a screw rod pre-pressurization device, a pre-cooler, a freeze dryer, a gas purification device and a gas heating device are arranged in the methane decarburization pipeline;
the screw pre-pressurization, the pre-cooler, the freeze dryer, the gas purification and the gas heating are sequentially connected in series;
the screw rod is pre-pressurized and connected with the oil cooler to form a lubricating oil loop;
the oil cooler is connected with the first heat exchanger to form a cooling water loop;
the first port of the second heat exchanger is connected with the third port of the water source heat pump, and the first port of the water source heat pump is respectively connected with the third port of the precooler and the third port of the freeze dryer;
the second port of the water source heat pump, the fourth port of the precooler and the fourth port of the freeze dryer are all connected to the third port of the gas heating, and the fourth port of the gas heating is connected to the second port of the second heat exchanger.
Preferably, the second port of the second heat exchanger is connected with a hot cold water inlet, the first port of the second heat exchanger is connected with the first port of the first heat exchanger, and the second port of the first heat exchanger is connected with the hot cold water outlet;
the second heat exchanger, the first heat exchanger, the hot cold water inlet and the hot cold water outlet form a hot cold water loop, and cooling water circulates in the hot cold water loop.
Preferably, a second fan is installed at the second heat exchanger;
and a first fan is arranged at the first heat exchanger.
Preferably, the freeze dryer comprises an evaporator and a condenser;
and a refrigerant loop is formed by connecting the evaporator and the condenser.
Preferably, the biogas decarbonization line further comprises: buffer filtering tank, membrane group, gas pressure reduction and product use point;
the buffer filter tank is connected with the first pre-pressurizing port of the screw;
the gas heating second port is connected with one end of the membrane group, the other end of the membrane group is connected with one end of the gas pressure reduction, and the other end of the gas pressure reduction is connected with the product using point.
Preferably, the film group includes: primary and secondary membranes;
one end of the primary membrane is connected with the second gas heating port, and the other end of the primary membrane is connected with the second secondary membrane port;
the first port of the secondary membrane is connected with the gas pressure reduction.
Preferably, the secondary membrane is provided with a gas outlet which is connected with the screw pre-pressurizing first port.
Preferably, the gas purification place is provided with a high-efficiency filter and a carbon bed filter.
Preferably, a biogas purification device decarbonization system adopts the cooling pipeline.
Preferably, the high efficiency filter is used for reducing solid particles to 0.01 μm or less, and the carbon bed filter is used for reducing the oil content in the gas to 0.01ppm or less.
Preferably, the primary membrane and the secondary membrane are hollow fiber membranes.
Preferably, the precooler, the freeze dryer, the gas heating, the water source heat pump and the second heat exchanger form a loop for cooling the precooler and the evaporator and heating the gas, and the medium in the loop is cooling water.
Preferably, the buffer filter tank, the screw pre-pressurization, the precooler, the evaporator, the gas purification, the gas heating, the primary membrane, the secondary membrane, the gas depressurization and the product use point form a methane decarburization pipeline, and methane enters the loop from the buffer filter tank and is processed and conveyed to the product use point.
Preferably, the lubricating oil loop medium is lubricating oil, and the oil cooler cools the pre-pressurization of the screw through a lubricating oil loop and recovers heat energy;
the medium of the cooling water loop is cooling water, and the first heat exchanger cools the oil cooler through the cooling water loop and recovers heat energy.
Preferably, the refrigerant circuit medium is a refrigerant, and the condenser cools the evaporator and recovers heat energy through the refrigerant circuit.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model completely recovers the heat of the screw compressor through the first heat exchanger;
2. the utility model discloses a precooler carries out the precooling to marsh gas, reduces the refrigeration load of freeze dryer.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of a cooling pipe connection structure;
shown in the figure:
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, a cooling pipeline for a decarbonization system of a biogas purification apparatus includes: the system comprises a biogas decarbonization pipeline, an oil cooler 11, a first heat exchanger 12, a water source heat pump 14 and a second heat exchanger 15; a screw pre-pressurization unit 2, a pre-cooler 3, a freeze dryer, a gas purification unit 5 and a gas heating unit 6 are arranged in a methane decarburization pipeline, the screw pre-pressurization unit 2, the pre-cooler 3, the freeze dryer, the gas purification unit 5 and the gas heating unit 6 are sequentially connected in series, a lubricating oil loop is formed by connecting the screw pre-pressurization unit 2 and the oil cooler 11, a lubricating oil medium flows through the lubricating oil loop, a cooling water loop is formed by connecting the oil cooler 11 and the first heat exchanger 12, the cooling water medium flows through the cooling water loop, a first port of a second heat exchanger 15 is connected with a third port of a water source heat pump 14, a first port of the water source heat pump 14 is respectively connected with a third port of the pre-cooler 3 and a third port of the freeze dryer, a second port of the water source heat pump 14, a fourth port of the pre-cooler 3 and a fourth port of the freeze dryer are respectively connected with a third port of the gas heating unit 6, and a fourth port of the gas heating unit 6 is connected with a second port of the second heat exchanger 15. The second fan 17 is installed at the second heat exchanger 15, and the first fan 16 is installed at the first heat exchanger 12.
The marsh gas decarbonization pipeline also comprises: a buffer filtering tank 1, a membrane group, a gas decompression 9 and a product use point 10; the buffer filter tank 1 is connected with a first port of the screw pre-pressurization 2, a second port of the gas heating 6 is connected with one end of the membrane group, the other end of the membrane group is connected with one end of the gas decompression 9, and the other end of the gas decompression 9 is connected with a product use point 10. The membrane group comprises: a primary membrane 7 and a secondary membrane 8; one end of the first-stage membrane 7 is connected with a second port of the gas heating device 6, the other end of the first-stage membrane 7 is connected with a second port of the second-stage membrane 8, and the first port of the second-stage membrane 8 is connected with a gas pressure reducing device 9. The second-stage membrane 8 is provided with an exhaust port, the exhaust port is connected with a first port of the pre-pressurization 2 of the screw rod, and a high-efficiency filter and a carbon bed filter are installed at the gas purification 5 position.
A second port of the second heat exchanger 15 is connected with a hot cold water inlet, a first port of the second heat exchanger 15 is connected with a first port of the first heat exchanger 12, and a second port of the first heat exchanger 12 is connected with a hot cold water outlet; the second heat exchanger 15, the first heat exchanger 12, the hot cold water inlet and the hot cold water outlet form a hot cold water loop, and cooling water circulates in the hot cold water loop. The freeze dryer comprises an evaporator 4 and a condenser 13; the evaporator 4 and the condenser 13 are connected to form a refrigerant circuit.
The precooler 3, the freeze dryer, the gas heating 6, the water source heat pump 14 and the second heat exchanger 15 form a loop for cooling the precooler 3 and the evaporator 4 and heating the gas heating 6, and a medium in the loop is cooling water.
The buffer filter tank 1, the screw pre-pressurization 2, the precooler 3, the evaporator 4, the gas purification 5, the gas heating 6, the primary membrane 7, the secondary membrane 8, the gas decompression 9 and the product use point 10 form a methane decarburization pipeline, and methane enters the loop from the buffer filter tank 1 and is processed and conveyed to the product use point 10.
Example 2
Example 2
Example 2 is a preferred example of example 1.
As shown in fig. 1, the deamination and desulfurization biogas passes through a buffer filter tank 1 and then is subjected to a screw pre-pressurization 2 process, the biogas gas pressure is increased from 1-2KPaG to more than 1.5MPaG, the process is completed by a micro-oil screw compressor of the screw pre-pressurization 2, then the pressurized biogas passes through a series of gas purification processes such as freeze drying, gas purification 5, gas heating 6 and the like, and then enters a membrane group to purify the biogas, so that natural gas product gas is produced.
The buffer filtering tank 1: in order to avoid the influence of water and desulfurizer particle dust carried in the deamination and desulfurization completed biogas, a buffer filter tank 1 is additionally arranged before the screw pre-pressurization 2 and is used for removing dust particles, liquid water drops and the like in the raw material biogas. The purity of the gas at the inlet of the screw pre-pressurization 2 is ensured.
Screw pre-pressurization 2: in order to achieve the optimum separation effect of the membrane module, the feed gas must be compressed to a process pressure suitable for the operation of the membrane module, so the compression system of the screw pre-pressurization 2 is particularly important, and more than 70% of the electricity consumption of the whole device occurs in the part.
A freeze dryer: the cleaning and freeze-drying system adopts a freeze dryer to perform freeze-drying and dehydration on the compressed methane. Firstly, the dew point of the process gas is reduced by utilizing the cold energy of the process gas, the dew point of the processed gas under pressure is 3-10 ℃, secondly, the heat energy generated by the freeze dryer is recovered, the evaporator 4 of the freeze dryer cools and dehumidifies the methane, and the condenser 13 heats the cooling water.
And (5) gas purification: in order to ensure that raw material methane enters the membrane group to be clean gas and prolong the service life of the membrane group, the system is provided with a multistage filtering system, the multistage filtering system adopts a high-efficiency filter to reduce solid particles to be less than or equal to 0.01 mu m, and a carbon bed filter is arranged in the filtering system to improve the oil filtering precision and reduce the oil content in the gas to be less than or equal to 0.01ppm.
Gas heating 6: in order to ensure the constant working temperature of the membrane group and further ensure the stability and the high efficiency of the methane recovery efficiency of the system, the purified gas needs to be heated, the heat of the lubricating oil of the screw pre-pressurization 2 is transferred to the gas circuit part at the front end of the membrane group through heat circulation, and the methane is heated.
Primary membrane and secondary membrane: the working principle of the hollow fiber membrane is that different gas molecules are separated through different permeation rates of different gases in the high polymer material hollow fiber membrane. Among them, a gas having a high permeation rate is referred to as "fast gas", and a gas having a low permeation rate is referred to as "slow gas". The fast gas is permeated fast, most of the fast gas is concentrated at one end of the gas inlet of the membrane group, and a small part of the fast gas penetrates to the output end of the membrane group; the "slow gas" penetrates slowly so that most of it penetrates the membrane module to the output end and a very small portion is concentrated at the input end of the membrane module. The water, hydrogen sulfide, carbon dioxide and oxygen in the biogas and the landfill gas are all 'fast gas', and the nitrogen and the methane are 'slow gas'. Therefore, the selectivity and the osmotic adsorption characteristics of the membrane group determine that the methane purification by the membrane method can remove a large amount of carbon dioxide and can remove part of hydrogen sulfide and oxygen impurities. The carbon dioxide passes through the two-stage hollow fiber membrane module to reach the design output requirement. The outer exhaust gas of the system is discharged in the primary membrane to become exhaust gas. After passing through the secondary membrane, the exhaust gas of the secondary membrane returns to the inlet of the screw pre-pressurization 2 through the exhaust port, and closed circulation is completed.
Gas decompression 9: since the pressure of the treated biogas is high and the pressure used normally is low, a gas pressure reduction device is required to reduce the high pressure biogas to low pressure gas.
Second heat exchanger 15: the cooling water which has recovered the condensation heat of the freeze dryer and the water source heat pump 14 heats the heat-taking cooling water in the second heat exchanger 15, so as to achieve the purpose of heat energy recovery; when there is no heated cooling water or heat recovery is not required, the second fan 17 is activated to discharge the recovered heat to the air.
First heat exchanger 12: the cooling water which has recovered the heat of the screw pre-supercharging 2 process heats the heat-taking cooling water in the first heat exchanger 12, so that the purpose of heat energy recovery is achieved; when there is no heated cooling water or heat recovery is not required, the first fan 16 is activated to discharge the recovered heat to the air.
Oil cooler 11: the screw compressor lubricating oil in the screw pre-charging step 2 is cooled by the cooling water in the oil cooler 11, and the cooling water after the temperature rise is released in the first heat exchanger 12.
Water source heat pump 14: the cooling water having finished heat release in the second heat exchanger 15 is divided into two paths, one path is cooled by the water source heat pump evaporator of the water source heat pump 14, and the other path is heated by the water source heat pump evaporator of the water source heat pump 14. The cooled cooling water pre-cools the methane and recovers heat of condensation of the freeze dryer, and the heated cooling water heats the methane.
The precooler 3: the cooling water from the water source heat pump 14 is used for pre-cooling the methane, so that the cooling load of the freeze dryer is reduced.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A cooling circuit, comprising: the system comprises a methane decarbonization pipeline, an oil cooler (11), a first heat exchanger (12), a water source heat pump (14) and a second heat exchanger (15);
a screw pre-pressurization device (2), a precooler (3), a freeze dryer, a gas purification device (5) and a gas heating device (6) are arranged in the methane decarburization pipeline;
the screw pre-pressurization (2), the pre-cooler (3), the freeze dryer, the gas purification (5) and the gas heating (6) are sequentially connected in series;
the screw rod pre-supercharging device (2) and the oil cooler (11) are connected to form a lubricating oil loop;
the oil cooler (11) and the first heat exchanger (12) are connected to form a cooling water loop;
the first port of the second heat exchanger (15) is connected with the third port of the water source heat pump (14), and the first port of the water source heat pump (14) is respectively connected with the third port of the precooler (3) and the third port of the freeze dryer;
the second port of the water source heat pump (14), the fourth port of the precooler (3) and the fourth port of the freeze dryer are all connected to the third port of the gas heating device (6), and the fourth port of the gas heating device (6) is connected to the second port of the second heat exchanger (15).
2. The cooling circuit of claim 1, wherein: a second port of the second heat exchanger (15) is connected with a hot cold water inlet, a first port of the second heat exchanger (15) is connected with a first port of the first heat exchanger (12), and a second port of the first heat exchanger (12) is connected with a hot cold water outlet;
the second heat exchanger (15), the first heat exchanger (12), the hot and cold water inlet and the hot and cold water outlet form a hot and cold water loop, and cooling water circulates in the hot and cold water loop.
3. The cooling circuit of claim 1, wherein: a second fan (17) is arranged at the second heat exchanger (15);
a first fan (16) is arranged at the first heat exchanger (12).
4. The cooling circuit according to claim 1, characterized in that said freeze dryer comprises an evaporator (4) and a condenser (13);
and a refrigerant loop is formed by connecting the evaporator (4) and the condenser (13).
5. The cooling circuit of claim 1, wherein the biogas decarbonization circuit further comprises: a buffer filtering tank (1), a membrane group, a gas decompression (9) and a product use point (10);
the buffer filter tank (1) is connected with a first port of the screw rod pre-pressurizing device (2);
the second port of the gas heating device (6) is connected with one end of the membrane group, the other end of the membrane group is connected with one end of the gas decompression device (9), and the other end of the gas decompression device (9) is connected with the product use point (10).
6. The cooling circuit of claim 5, wherein the membrane module comprises: a primary membrane (7) and a secondary membrane (8);
one end of the primary membrane (7) is connected with a second port of the gas heating device (6), and the other end of the primary membrane (7) is connected with a second port of the secondary membrane (8);
the first port of the secondary membrane (8) is connected with the gas pressure reduction (9).
7. The cooling circuit of claim 6, wherein: the second-stage membrane (8) is provided with an air outlet, and the air outlet is connected with the first port of the screw rod pre-pressurization (2).
8. The cooling circuit of claim 1, wherein: and a high-efficiency filter and a carbon bed filter are arranged at the gas purification (5).
9. The utility model provides a marsh gas purifier decarbonization system which characterized in that: the methane purification device decarbonization system adopts the cooling pipeline of any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221241666.2U CN217628265U (en) | 2022-05-19 | 2022-05-19 | Cooling pipeline and biogas purification device decarbonization system |
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| CN202221241666.2U CN217628265U (en) | 2022-05-19 | 2022-05-19 | Cooling pipeline and biogas purification device decarbonization system |
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| CN217628265U true CN217628265U (en) | 2022-10-21 |
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