CN213172231U - Marsh gas purification drying system - Google Patents
Marsh gas purification drying system Download PDFInfo
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- CN213172231U CN213172231U CN202021747519.3U CN202021747519U CN213172231U CN 213172231 U CN213172231 U CN 213172231U CN 202021747519 U CN202021747519 U CN 202021747519U CN 213172231 U CN213172231 U CN 213172231U
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Abstract
The utility model relates to the technical field of methane purification and drying, in particular to a methane purification and drying system, which comprises a desulfurizing tower, a pre-cooler, a water-vapor separator, a gas compressor, a pre-tower separator, a decarbonizing tower, a freezing dryer and a molecular sieve drying device; the method comprises the following steps that biogas enters a desulfurizing tower through a gas inlet at the lower end of the desulfurizing tower, a gas outlet at the top of the desulfurizing tower, a pre-cooler, a water-vapor separator, a gas compressor and a gas inlet of a pre-tower separator are sequentially communicated through a pipeline, a gas outlet of the pre-tower separator is communicated with a gas inlet at the lower end of a decarburization tower, a gas outlet at the top of the decarburization tower is communicated with a gas inlet of a freeze-drying machine, and a gas outlet of the freeze-drying machine is communicated with a gas inlet pipe of a molecular sieve. After the system carries out desulfurization, decarburization and drying on the biogas, the biogas is converted into energy which can be directly utilized and is directly merged into a natural gas direct supply pipe network, so that high-value utilization of biomass energy is realized, the technology is advanced, the energy efficiency is high, and the system has wide application prospect.
Description
Technical Field
The utility model relates to a marsh gas purification and drying technical field, concretely relates to marsh gas purification and drying system.
Background
The anaerobic digestion technology utilizes the metabolism of microorganisms to decompose organic matters such as energy crops, perishable garbage, livestock and poultry manure and the like to generate biological methane, and plays an important role in meeting the world energy requirements.
A large amount of biogas is generated by anaerobic digestion of municipal sludge, and a high-efficiency anaerobic digestion biogas low-pressure conveying operation system is built by controlling parameters such as pressure, organic load, PH and raw material characteristics, so that anaerobic digestion reaction is promoted to be continuously carried out in the methane production direction, and the biogas is produced to the maximum. The main component of the marsh gas is CH4And CO2And also contains a trace amount of H2S, the key point of preparing natural gas from biogas is the purification and drying of biogas: namely biogas desulfurization, decarburization and dehydration.
How to make biogas generated by anaerobic digestion meet the requirements of direct injection into natural gas pipe networks and other direct utilization ways becomes the focus of research in the field in recent years.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the problem that above-mentioned exists, designed a marsh gas purification drying system, carried out desulfurization, decarbonization and dehydration drying to the marsh gas that anaerobic digestion produced in proper order, changed marsh gas into the energy that can directly utilize, directly go into the natural gas and directly supply the pipe network, realize the high value utilization of the living beings energy, the technique is advanced, and the efficiency is high, has wide application prospect.
In order to realize the technical purpose, reach above-mentioned technological effect, the utility model discloses a realize through following technical scheme:
a biogas purification and drying system comprises a desulfurizing tower, a pre-cooler, a water-vapor separator, a gas compressor, a pre-tower separator, a decarbonizing tower, a freezing dryer and a molecular sieve drying device; the method comprises the following steps that biogas enters a desulfurizing tower through a gas inlet at the lower end of the desulfurizing tower, a gas outlet at the top of the desulfurizing tower, a pre-cooler, a water-vapor separator, a gas compressor and a gas inlet of a pre-tower separator are sequentially communicated through a pipeline, a gas outlet of the pre-tower separator is communicated with a gas inlet at the lower end of a decarburization tower, a gas outlet at the top of the decarburization tower is communicated with a gas inlet of a freeze-drying machine, and a gas outlet of the freeze-drying machine is communicated with a gas inlet pipe of a molecular sieve.
Further, the molecular sieve drying device comprises an air inlet pipe, an air outlet pipe, a recovery pipeline, a first drying tower, a second drying tower and a heater, wherein the air inlet pipe is communicated with air inlets of the first drying tower and the second drying tower through a first air inlet branch pipe and a second air inlet branch pipe respectively; a first air inlet valve and a second air inlet valve are respectively arranged on the first air inlet branch pipe and the second air inlet branch pipe; the air inlets of the first drying tower and the second drying tower are respectively communicated with a recovery pipeline through a first exhaust pipe and a second exhaust pipe, and the first exhaust pipe and the second exhaust pipe are respectively provided with a first exhaust valve and a second exhaust valve; the air outlets of the first drying tower and the second drying tower are respectively communicated with an air outlet pipe through a first air outlet branch pipe and a second air outlet branch pipe, and a first valve and a second valve are respectively arranged on the first air outlet branch pipe, the second air outlet branch pipe and the air outlet pipe; the air outlet pipe is communicated with an inlet of the heater through a return pipe, and a regulating valve and a third valve are mounted on the return pipe; the outlet of the heater is communicated with the air outlets of the first drying tower and the second drying tower through a first regeneration pipe and a second regeneration pipe respectively, and the first regeneration pipe and the second regeneration pipe are provided with a first regeneration valve and a second regeneration valve respectively.
Further, the pre-tower separator is an oil-water separator.
Furthermore, the first air inlet valve, the second air inlet valve, the first exhaust valve and the second exhaust valve are all pneumatic valves.
The utility model has the advantages that:
h in the biogas is removed by a desulfurizing tower in the biogas purification and drying system2S gas, the desulfurized biogas is firstly cooled by a pre-cooler, condensed water in the gas is separated by a water-vapor separator, the gas is pressurized by a gas compressor and then sent to a pre-tower separator, the moisture in the gas and the entrained compressor oil-water are separated by the pre-tower separator and then sent to a decarbonization tower, and CO in the biogas is removed2The purified biogas is obtained, finally, the moisture in the biogas is removed through the freezing dryer and the molecular sieve drying device, the freezing dryer and the molecular sieve drying device are combined for use, the advantages are complementary, 80% of moisture in the biogas is removed through the freezing dryer, then deep dehydration is carried out through the molecular sieve drying device, the dew point of the biogas is ensured to be below-40 ℃, the dehydration is thorough, and the standard of the biogas is ensured. After desulfurization, decarburization and drying purification, the biogas is converted into energy which can be directly utilized and is directly merged into a natural gas direct supply pipe network, so that high-value utilization of biomass energy is realized, the technology is advanced, the energy efficiency is high, and the method has a wide application prospect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the structure of a molecular sieve drying apparatus.
In the drawings, the components represented by the respective reference numerals are listed below:
1-a desulfurizing tower, 2-a pre-cooler, 3-a water-vapor separator, 4-a gas compressor, 5-a pre-separator, 6-a decarbonizing tower, 7-a freezing dryer, 8-a molecular sieve drying device, 801-a gas inlet pipe, 802-a gas outlet pipe, 803-a recovery pipeline, 804-a first drying tower, 805-a second drying tower, 806-a heater, 807-a first gas inlet valve, 808-a second gas inlet valve, 809-a first gas exhaust valve, 810-a second gas exhaust valve, 811-a first valve, 812-a second valve, 813-a first regeneration valve, 814-a second regeneration valve, 815-a regulating valve and 816-a third valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-2, a biogas purification and drying system comprises a desulfurizing tower 1, a pre-cooler 2, a water-vapor separator 3, a gas compressor 4, a pre-tower separator 5, a decarbonizing tower 6, a freezing dryer 7 and a molecular sieve drying device 8; biogas enters the desulfurizing tower 1 through a gas inlet at the lower end of the desulfurizing tower 1, a gas outlet at the top of the desulfurizing tower 1, a pre-cooler 2, a water-vapor separator 3, a gas compressor 4 and a gas inlet of a pre-tower separator 5 are sequentially communicated through a pipeline, wherein the pre-tower separator 5 is an oil-water separator, a gas outlet of the pre-tower separator 5 is communicated with a gas inlet at the lower end of a decarburization tower 6, a gas outlet at the top of the decarburization tower 6 is communicated with a gas inlet of a freezing dryer 7, and a gas outlet of the freezing dryer 7 is communicated with a gas inlet pipe of a molecular sieve drying device 8.
The molecular sieve drying device 8 comprises an air inlet pipe 801, an air outlet pipe 802, a recovery pipeline 803, a first drying tower 804, a second drying tower 805 and a heater 806, wherein the air inlet pipe 801 is communicated with air inlets of the first drying tower 804 and the second drying tower 805 through a first air inlet branch pipe and a second air inlet branch pipe respectively; a first air inlet valve 807 and a second air inlet valve 808 are respectively arranged on the first air inlet branch pipe and the second air inlet branch pipe; the air inlets of the first drying tower 804 and the second drying tower 805 are respectively communicated with the recovery pipeline 803 through a first exhaust pipe and a second exhaust pipe, and the first exhaust pipe and the second exhaust pipe are respectively provided with a first exhaust valve 809 and a second exhaust valve 810; the air outlets of the first drying tower 804 and the second drying tower 805 are respectively communicated with an air outlet pipe 802 through a first air outlet branch pipe and a second air outlet branch pipe, and a first valve 811 and a second valve 812 are respectively arranged on the first air outlet branch pipe, the second air outlet branch pipe and the air outlet pipe; the air outlet pipe is communicated with the inlet of the heater 806 through a return pipe 802, and a regulating valve 815 and a third valve 816 are arranged on the return pipe; the outlet of the heater 806 is communicated with the gas outlets of the first drying tower 804 and the second drying tower 805 through a first regeneration pipe and a second regeneration pipe, which are respectively provided with a first regeneration valve 813 and a second regeneration valve 814.
Wherein the first intake valve 807, the second intake valve 808, the first exhaust valve 809, and the second exhaust valve 810 are all pneumatic valves.
Wherein the freezing type dryer 7 is the prior art, and the working principle is as follows: the method comprises the steps that raw material gas is pre-cooled through a gas-to-gas heat exchanger, then the pre-cooled raw material gas is further cooled in a gas-to-refrigerant heat exchanger through a refrigerant circulation loop of a refrigeration dryer, heat exchange is carried out on the pre-cooled raw material gas and cold gas which is cooled to a pressure dew point from an evaporator, the temperature of the raw material gas is further reduced, then the raw material gas enters the evaporator and exchanges heat with a refrigerant, the temperature of the raw material gas is reduced to 0-8 ℃, moisture in the gas is separated out at the temperature, moisture oil and impurities condensed from the raw material gas are separated through a condenser, and the separated moisture oil and impurities are discharged out of the machine through an automatic drainer. And the dried low-temperature gas enters the gas to carry out heat exchange on the gas exchanger, and the gas is output after the temperature is increased.
When the molecular sieve drying device 8 works, normal temperature humid gas with the pressure of 0.8MPa enters the first drying tower 804 through the gas inlet pipe 801 and the first gas inlet valve 807 for drying, and then is exhausted from the gas outlet pipe 802 through the first valve 811 for use by a user. Meanwhile, a part of dry gas (about 1Nm3/min, 6% -10%) enters a heater 806 through a regulating valve 815 and a third valve 816 and is heated to about 200 ℃, enters a second drying tower 805 through a second regeneration valve 814 and is used as regeneration gas of the second drying tower 805 to regenerate the drying agent of the second drying tower 805, the average temperature of the regeneration gas from the second drying tower 805 is 40-120 ℃, moisture is brought out, and finally the regeneration gas enters a recovery pipeline 803 through a second exhaust valve 810 and is connected with a closed pipeline to be discharged into a pipeline in front of a buffer tank after desulfurization, after the process is carried out for 2.5 hours, the heating is closed, the dry gas is continuously blown, and the second drying tower 805 is subjected to cold blowing for nearly 1.5 hours. After the cold blowing is finished, the second exhaust valve 810 is closed, and the second intake valve 808 is opened to pressurize the second drying tower 805 to the same pressure as the first drying tower 804. The electric control box sends a signal to close the first intake valve 807 and open the first exhaust valve 809 for the regeneration cycle. The first drying tower 804 starts to move to the regeneration stage, and the process is repeated in this way, so that dry gas is continuously sent out, and meanwhile, the drying agent is continuously regenerated.
The working principle of the methane purifying and drying system is as follows: the marsh gas enters the desulfurizing tower 1 through an air inlet at the lower end of the desulfurizing tower 1, and H is removed from the marsh gas through a desulfurizing agent in the desulfurizing tower 1 from bottom to top2S (active iron oxide in desulfurizing tower and H in marsh gas)2S reacts to generate sulfide salt to remove H2S), detecting desulfurized biogas H2The S index is not detected, and reaches the standard requirements of GB17820-2012 civil fuel grade natural gas, H2The S content is less than 6mg/m3, and the total sulfur content is less than 60mg/m 3. The desulfurized biogas is firstly cooled by a pre-cooler 2, condensed water in the biogas is separated by a water-vapor separator 3, the biogas is pressurized by a gas compressor 4 and then sent to a pre-tower separator 5, moisture and entrained compressor oil-water in the biogas are separated by the pre-tower separator 5 and then sent to a decarbonization tower 6, and CO in the biogas is removed2The decarbonization process is carried out in a liquid environment, so that the moisture of the outlet gas is saturated or even supersaturated, and accumulated water possibly exists in a pipeline in the conveying process, so as to ensure that products are purifiedThe gas is smoothly delivered, and the reduction of the water content in the output gas is the most thorough solution. The biogas is firstly dehydrated by 80 percent of water in the gas through a freezing type dryer 7, and then is deeply dehydrated through a molecular sieve drying device 8, so that the dew point of the gas is ensured to be below 40 ℃ below zero, the dehydration is thorough, and the standard of the gas outlet is ensured.
The biomass fuel gas H after being desulfurized, decarbonized, dried and purified2The biomass energy utilization method has the advantages that S is not detected, the methane content is more than 95%, the heat value is 8000 kilocalories, the dew point can reach-40 ℃, the standard requirements of GB17820-2012 civil fuel grade natural gas are met, the biogas is converted into directly-utilized energy and is directly merged into a natural gas direct supply pipe network, the high-value utilization of the biomass energy is realized, the technology is advanced, the energy efficiency is high, and the biomass energy utilization method has a wide application prospect.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should be able to make changes, alterations, additions or substitutions within the scope of the present invention.
Claims (4)
1. A marsh gas purifies drying system which characterized in that: comprises a desulfurizing tower, a pre-cooler, a water-vapor separator, a gas compressor, a pre-tower separator, a decarbonizing tower, a freezing dryer and a molecular sieve drying device; the method comprises the following steps that biogas enters a desulfurizing tower through a gas inlet at the lower end of the desulfurizing tower, a gas outlet at the top of the desulfurizing tower, a pre-cooler, a water-vapor separator, a gas compressor and a gas inlet of a pre-tower separator are sequentially communicated through a pipeline, a gas outlet of the pre-tower separator is communicated with a gas inlet at the lower end of a decarburization tower, a gas outlet at the top of the decarburization tower is communicated with a gas inlet of a freeze-drying machine, and a gas outlet of the freeze-drying machine is communicated with a gas inlet pipe of a molecular sieve.
2. The biogas purification and drying system according to claim 1, wherein: the molecular sieve drying device comprises an air inlet pipe, an air outlet pipe, a recovery pipeline, a first drying tower, a second drying tower and a heater, wherein the air inlet pipe is respectively communicated with air inlets of the first drying tower and the second drying tower through a first air inlet branch pipe and a second air inlet branch pipe; a first air inlet valve and a second air inlet valve are respectively arranged on the first air inlet branch pipe and the second air inlet branch pipe; the air inlets of the first drying tower and the second drying tower are respectively communicated with a recovery pipeline through a first exhaust pipe and a second exhaust pipe, and the first exhaust pipe and the second exhaust pipe are respectively provided with a first exhaust valve and a second exhaust valve; the air outlets of the first drying tower and the second drying tower are respectively communicated with an air outlet pipe through a first air outlet branch pipe and a second air outlet branch pipe, and a first valve and a second valve are respectively arranged on the first air outlet branch pipe, the second air outlet branch pipe and the air outlet pipe; the air outlet pipe is communicated with an inlet of the heater through a return pipe, and a regulating valve and a third valve are mounted on the return pipe; the outlet of the heater is communicated with the air outlets of the first drying tower and the second drying tower through a first regeneration pipe and a second regeneration pipe respectively, and the first regeneration pipe and the second regeneration pipe are provided with a first regeneration valve and a second regeneration valve respectively.
3. The biogas purification and drying system according to claim 1, wherein: the pre-tower separator is an oil-water separator.
4. The biogas purification and drying system according to claim 2, wherein: and the first air inlet valve, the second air inlet valve, the first exhaust valve and the second exhaust valve are all pneumatic valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021747519.3U CN213172231U (en) | 2020-08-20 | 2020-08-20 | Marsh gas purification drying system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021747519.3U CN213172231U (en) | 2020-08-20 | 2020-08-20 | Marsh gas purification drying system |
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| CN213172231U true CN213172231U (en) | 2021-05-11 |
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| CN202021747519.3U Active CN213172231U (en) | 2020-08-20 | 2020-08-20 | Marsh gas purification drying system |
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