CN215517290U - System for preparing city natural gas from methane - Google Patents
System for preparing city natural gas from methane Download PDFInfo
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- CN215517290U CN215517290U CN202121474353.7U CN202121474353U CN215517290U CN 215517290 U CN215517290 U CN 215517290U CN 202121474353 U CN202121474353 U CN 202121474353U CN 215517290 U CN215517290 U CN 215517290U
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Abstract
The utility model discloses a system for preparing urban natural gas from biogas, which comprises a biogas storage system, a desulfurization system, a decarburization system and a natural gas dehydration system which are sequentially connected, wherein the biogas storage system is connected with a biogas inlet system, and the natural gas dehydration system is connected with an urban natural gas pipe network; the desulfurization system comprises a wet desulfurization system and a dry desulfurization system which are connected in series, the wet desulfurization system is connected with the methane storage system, and the dry desulfurization system is connected with the decarburization system; the decarbonization system comprises an absorption tower, a flash tower and a regeneration tower, wherein a bottom air inlet of the absorption tower is connected with a desulfurization system, a top air outlet is connected with a natural gas dehydration system, a bottom liquid outlet is connected with an upper liquid inlet of the flash tower, a bottom liquid outlet of the flash tower is respectively connected with an upper liquid inlet of the regeneration tower and a middle liquid inlet of the absorption tower, a top air outlet of the regeneration tower is connected with a lower air inlet of the flash tower, and a bottom liquid outlet is connected with an upper liquid inlet of the absorption tower.
Description
Technical Field
The utility model relates to the technical field of natural gas purification, in particular to a system for preparing urban natural gas from methane.
Background
The existing natural gas purification system, especially an urban natural gas system with high methane refining purity, has complex process and poor purification efficiency, and is difficult to meet the preset purity requirement.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the utility model are as follows: .
In order to solve the technical problems, the utility model adopts the following technical scheme:
a system for preparing urban natural gas from biogas comprises a biogas storage system, a desulfurization system, a decarburization system and a natural gas dehydration system which are sequentially connected, wherein the biogas storage system is connected with a biogas inlet system, and the natural gas dehydration system is connected with an urban natural gas pipe network;
the system comprises a desulfurization system, a methane storage system, a desulfurization system and a decarbonization system, wherein the desulfurization system comprises a wet desulfurization system and a dry desulfurization system which are connected in series;
the decarbonization system comprises an absorption tower, a flash tower and a regeneration tower, wherein a bottom air inlet of the absorption tower is connected with a desulfurization system, a top air outlet is connected with a natural gas dehydration system, a bottom liquid outlet is connected with an upper liquid inlet of the flash tower, a bottom liquid outlet of the flash tower is respectively connected with an upper liquid inlet of the regeneration tower and a middle liquid inlet of the absorption tower, and a top air outlet is communicated with the outside; and a gas outlet at the top of the regeneration tower is connected with a gas inlet at the lower part of the flash tower, and a liquid outlet at the bottom of the regeneration tower is connected with a liquid inlet at the upper part of the absorption tower.
Furthermore, the wet desulphurization system comprises three primary desulphurization towers connected in parallel and two secondary desulphurization towers connected in parallel, the primary desulphurization towers are connected with an air inlet pipeline of the biogas storage system, an air inlet pipeline of the secondary desulphurization towers is connected with the primary desulphurization towers, and an air outlet pipeline is connected with the dry desulphurization system; the dry desulfurization system comprises two dry desulfurization towers connected in parallel, and an air outlet of each dry desulfurization tower is connected with the decarburization system.
Furthermore, the first-stage desulfurizing tower is a biological desulfurizing tower for biological desulfurization, and the second-stage desulfurizing tower is a chemical desulfurizing tower for chemical desulfurization.
Furthermore, a steam-water separator and a secondary gas-liquid separator which are connected in series are further arranged between the dry desulphurization system and the wet desulphurization system, the steam-water separator is connected with the wet desulphurization system, and the secondary gas-liquid separator is connected with the dry desulphurization system.
Further, natural gas dewatering system is including adsorption tower, pressure device and the odorization device of establishing ties, the adsorption tower is connected with the decarbonization system, and the odorization device is connected with city natural gas pipe network, and the adsorption tower sets up two in parallel.
And further, a pressure reduction and temperature rise device is arranged between a liquid outlet at the bottom of the absorption tower and a liquid inlet at the upper part of the flash tower, and the pressure reduction and temperature rise device is communicated with the middle part of the absorption tower in a gas phase manner.
Furthermore, one part of the liquid phase in the flash tower enters the regeneration tower through a temperature rising device, and the other part of the liquid phase enters the absorption tower through a temperature lowering device.
Furthermore, a cooling and pressurizing device is arranged between a liquid outlet at the bottom of the regeneration tower and a liquid inlet at the upper part of the absorption tower.
Compared with the prior art, the method has the beneficial effects that the compressed natural gas is refined from the marsh gas through the front-end wet desulphurization and dry desulphurization and the decarbonization system, the wet desulphurization can reduce the hydrogen sulfide carried in the marsh gas to a reasonable range, then the hydrogen sulfide is condensed and dehydrated and separated from gas and liquid, the concentration of the hydrogen sulfide is further reduced through the dry desulphurization, and then the decarbonization system is used for removing impurity gases such as carbon dioxide and the like, so that the purity of the refined compressed natural gas is effectively improved, and the method is convenient to produce and apply.
Drawings
FIG. 1 is a wet desulfurization system in an example;
FIG. 2 is a dry desulfurization system in an example;
FIG. 3 shows a decarburization system in an example;
FIG. 4 is a dewatering system in an embodiment;
in the figure: 1 one-level desulfurizing tower, 2 second grade desulfurizing towers, 3 catch water, 4 second grade vapour and liquid separators, 5 dry desulfurizing towers, 6 absorption towers, 7 flash distillation towers, 8 regenerator, 9 decompression rising temperature device, 10 cooling pressure device, 11 rising temperature device, 12 falling temperature device, 13 pressure device, 14 odorizing device, 15 adsorption towers.
Detailed Description
The utility model is further illustrated with reference to the following figures and examples.
Example (b):
as shown in the figures 1-4 of the drawings,
a system for preparing urban natural gas from biogas comprises a biogas storage system, a desulfurization system, a decarburization system and a natural gas dehydration system which are sequentially connected, wherein the biogas storage system is connected with a biogas inlet system, and the natural gas dehydration system is connected with an urban natural gas pipe network;
the system comprises a desulfurization system, a methane storage system, a desulfurization system and a decarbonization system, wherein the desulfurization system comprises a wet desulfurization system and a dry desulfurization system which are connected in series;
the wet desulphurization system comprises three primary desulphurization towers 1 connected in parallel and two secondary desulphurization towers 2 connected in parallel, wherein the primary desulphurization tower 1 is connected with an air inlet pipeline of the biogas storage system, an air inlet pipeline of the secondary desulphurization tower 2 is connected with the primary desulphurization tower 1, and an air outlet pipeline is connected with the dry desulphurization system; the dry desulfurization system comprises two dry desulfurization towers 5 connected in parallel, and an air outlet of each dry desulfurization tower 5 is connected with a decarburization system.
The first-stage desulfurizing tower 1 is a biological desulfurizing tower for biological desulfurization, and the second-stage desulfurizing tower 2 is a chemical desulfurizing tower for chemical desulfurization.
And a steam-water separator 3 and a secondary gas-liquid separator 4 which are connected in series are also arranged between the dry desulfurization system and the wet desulfurization system, the steam-water separator 3 is connected with the wet desulfurization system, and the secondary gas-liquid separator 4 is connected with the dry desulfurization system.
The decarbonization system comprises an absorption tower 6, a flash tower 7 and a regeneration tower 8, wherein a bottom air inlet of the absorption tower 6 is connected with a desulfurization system, a top air outlet is connected with a natural gas dehydration system, a bottom liquid outlet is connected with an upper liquid inlet of the flash tower 7, a bottom liquid outlet of the flash tower 7 is respectively connected with an upper liquid inlet of the regeneration tower 8 and a middle liquid inlet of the absorption tower 6, and the top air outlet is communicated with the outside; and a gas outlet at the top of the regeneration tower 8 is connected with a gas inlet at the lower part of the flash tower 7, and a liquid outlet at the bottom of the regeneration tower is connected with a liquid inlet at the upper part of the absorption tower 6.
The natural gas dehydration system comprises an adsorption tower 15, a pressurizing device 13 and an odorizing device 14 which are connected in series, wherein the adsorption tower 15 is connected with a decarburization system, the odorizing device 14 is connected with an urban natural gas pipe network, and the adsorption tower 15 is connected in parallel.
And a pressure-reducing and temperature-raising device 9 is arranged between a liquid outlet at the bottom of the absorption tower 6 and a liquid inlet at the upper part of the flash tower 7, and the pressure-reducing and temperature-raising device 9 is communicated with the middle part of the absorption tower 6 in a gas phase manner.
One part of the liquid phase in the flash tower 7 enters the regeneration tower 8 through a temperature rising device 11, and the other part of the liquid phase enters the absorption tower 6 through a temperature lowering device 12.
And a cooling and pressurizing device 10 is arranged between a liquid outlet at the bottom of the regeneration tower 8 and a liquid inlet at the upper part of the absorption tower 6.
The biogas wet desulphurization system comprises but not limited to a plurality of sets of desulphurization towers, Roots blowers, barren liquor pumps, pregnant liquor pumps, regeneration tanks, pipelines, valve banks, instruments, a control system and the like.
The utility model adopts an alkali liquor desulfurization process, wherein alkali liquor is adopted for spraying, methane enters a desulfurization tower after being pressurized by a Roots blower, a filler is arranged in the desulfurization tower, the absorption of H2S is completed through the alkali liquor, the alkali liquor absorbing H2S is recycled after regeneration, sulfur foam obtained by regeneration is processed by a filter press to be made into sulfur foam blocks, and desulfurization liquid is returned to a system for use.
The system for decarbonizing and dehydrating the methane by the amine method comprises, but is not limited to, a methane compressor, an absorption tower 6, a regeneration tower 8, a reboiler, a lean and rich liquid pump, dehydration equipment, a pipeline, a valve group, an instrument, a control system and the like. The flow regulation of the amine decarburization dehydration system is based on a boiler methane flow signal, when the gas consumption of the boiler is reduced, the flow signal controls the frequency conversion of a methane compressor (the frequency is changed from low to high), and vice versa.
In the amine decarburization dehydration process, methane subjected to dry desulfurization enters from the bottom of the absorption tower 6 to be in countercurrent contact with amine liquid sprayed from the top of the tower, and acid gases such as CO2 and H2S are absorbed; the product gas flows out from the top of the tower, the rich liquid absorbing CO2 flows out from the bottom of the tower, the rich liquid absorbing CO2 is decompressed, at the moment, part of CO2 is released, the rich liquid is heated by a boiler and is completely regenerated, at the moment, the amine liquid is changed into lean liquid, and the lean liquid is pressurized by a lean liquid pump and is cooled by a cooler and then is pumped into the absorption tower 6. The regenerated CO2 flows out from the top of the regeneration tower 8, and the emission needs to meet the requirement of environmental assessment and criticality.
Through the wet flue gas desulfurization and the dry-type desulfurization of front end, refine refined CNG from marsh gas through the decarbonization system again, the wet flue gas desulfurization can reduce the hydrogen sulfide that carries in the marsh gas to behind the reasonable scope through condensation dehydration and gas-liquid separation, and rethread dry method desulfurization further reduces hydrogen sulfide concentration, and then gets rid of impurity gas such as carbon dioxide wherein through the decarbonization system, the effectual purity that has improved refined CNG, the production of being convenient for is used.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and although the present invention has been described in detail by referring to the preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention can be made without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.
Claims (8)
1. The system for preparing the urban natural gas from the biogas is characterized by comprising a biogas storage system, a desulfurization system, a decarburization system and a natural gas dehydration system which are sequentially connected, wherein the biogas storage system is connected with a biogas inlet system, and the natural gas dehydration system is connected with an urban natural gas pipe network;
the system comprises a desulfurization system, a methane storage system, a desulfurization system and a decarbonization system, wherein the desulfurization system comprises a wet desulfurization system and a dry desulfurization system which are connected in series;
the decarbonization system comprises an absorption tower, a flash tower and a regeneration tower, wherein a bottom air inlet of the absorption tower is connected with a desulfurization system, a top air outlet is connected with a natural gas dehydration system, a bottom liquid outlet is connected with an upper liquid inlet of the flash tower, a bottom liquid outlet of the flash tower is respectively connected with an upper liquid inlet of the regeneration tower and a middle liquid inlet of the absorption tower, and a top air outlet is communicated with the outside; and a gas outlet at the top of the regeneration tower is connected with a gas inlet at the lower part of the flash tower, and a liquid outlet at the bottom of the regeneration tower is connected with a liquid inlet at the upper part of the absorption tower.
2. The system for preparing the urban natural gas by using the biogas as recited in claim 1, wherein the wet desulfurization system comprises three primary desulfurization towers connected in parallel and two secondary desulfurization towers connected in parallel, the primary desulfurization towers are connected with an inlet pipeline of the biogas storage system, an inlet pipeline of each secondary desulfurization tower is connected with the primary desulfurization tower, and an outlet pipeline is connected with the dry desulfurization system; the dry desulfurization system comprises two dry desulfurization towers connected in parallel, and an air outlet of each dry desulfurization tower is connected with the decarburization system.
3. The system for producing the urban natural gas by using the biogas as recited in claim 2, wherein the primary desulfurization tower is a biological desulfurization tower for performing biological desulfurization, and the secondary desulfurization tower is a chemical desulfurization tower for performing chemical desulfurization.
4. The system for producing the urban natural gas by using the biogas as recited in claim 1, wherein a steam-water separator and a secondary gas-liquid separator are further arranged between the dry desulfurization system and the wet desulfurization system and are connected in series, the steam-water separator is connected with the wet desulfurization system, and the secondary gas-liquid separator is connected with the dry desulfurization system.
5. The system for preparing the urban natural gas from the biogas according to claim 1, wherein the natural gas dehydration system comprises two adsorption towers, a pressurizing device and an odorizing device which are connected in series, the adsorption towers are connected with the decarburization system, the odorizing device is connected with an urban natural gas pipe network, and the adsorption towers are connected in parallel.
6. The system for preparing the urban natural gas from the biogas as recited in claim 1, wherein a pressure and temperature reduction device is disposed between the liquid outlet at the bottom of the absorption tower and the liquid inlet at the upper part of the flash tower, and the pressure and temperature reduction device is in gas phase communication with the middle part of the absorption tower.
7. The system for producing the urban natural gas by using the biogas as recited in claim 1, wherein the liquid outlet end of the flash tower is connected with the regeneration tower through a branch via a temperature raising device, and the other branch is connected with the absorption tower through a temperature lowering device.
8. The system for producing the urban natural gas by using the biogas as recited in claim 1, wherein a temperature-reducing and pressurizing device is arranged between the liquid outlet at the bottom of the regeneration tower and the liquid inlet at the upper part of the absorption tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121474353.7U CN215517290U (en) | 2021-06-30 | 2021-06-30 | System for preparing city natural gas from methane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121474353.7U CN215517290U (en) | 2021-06-30 | 2021-06-30 | System for preparing city natural gas from methane |
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| Publication Number | Publication Date |
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| CN215517290U true CN215517290U (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121474353.7U Active CN215517290U (en) | 2021-06-30 | 2021-06-30 | System for preparing city natural gas from methane |
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| CN (1) | CN215517290U (en) |
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2021
- 2021-06-30 CN CN202121474353.7U patent/CN215517290U/en active Active
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