CN210483815U - Grouped turbine expansion system for low-temperature gas liquefaction - Google Patents
Grouped turbine expansion system for low-temperature gas liquefaction Download PDFInfo
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- CN210483815U CN210483815U CN201921305102.9U CN201921305102U CN210483815U CN 210483815 U CN210483815 U CN 210483815U CN 201921305102 U CN201921305102 U CN 201921305102U CN 210483815 U CN210483815 U CN 210483815U
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Abstract
The utility model discloses a grouped low temperature is turbo-expansion system for liquefaction, include: the system comprises a cold box, turbo-expansion units and oil supply stations, wherein each turbo-expansion unit is connected with the cold box through a pipeline, each oil supply station is connected with the corresponding turbo-expansion unit through an oil supply pipe and an oil return pipe, every two adjacent turbo-expansion units are combined into a unit, when the number of the remaining turbo-expansion units is three, the remaining three units are combined into a unit, two oil supply pipes corresponding to the two units of the turbo-expansion units are connected through a pipeline with a valve, and two oil return pipes corresponding to the unit are connected through a pipeline with a bidirectional pump; three oil supply pipes that the unit that turboexpander set quantity is three corresponds communicate each other through the pipeline of taking the valve, and three return oil pipes that this unit corresponds communicate each other through the pipeline of taking the two-way pump, still include: and a central controller. The system can ensure that each turboexpander set can reliably and stably operate.
Description
Technical Field
The utility model relates to a low temperature gas liquefaction equipment field, concretely relates to grouped low temperature is turbine expansion system for gas liquefaction.
Background
The low-temperature gas such as hydrogen, helium and the like is more beneficial to transportation and storage after being liquefied, the cold energy required by the low-temperature gas liquefaction is usually provided by a turbine expansion system, the gas is subjected to adiabatic expansion and does work outwards, which is an important method for obtaining low temperature, and the turbine expansion system cools the working medium gas by enabling the compressed working medium gas to enter a turbine expansion machine under high pressure for adiabatic expansion to push an impeller to do work outwards, and then the cooled working medium gas and the low-temperature gas are subjected to heat exchange to provide cold energy for the low-temperature gas. The structure of the existing turboexpansion system includes: the cold box, a plurality of can provide the turbo expansion unit of cold volume for low temperature gas liquefaction, a plurality of and each turbo expansion unit one-to-one can be for the oil feeding station of turbo expansion unit circulation fuel feeding, each turbo expansion unit links to each other with the cold box through the pipeline respectively, make the working medium gas that expands in the turbo expansion unit and do work the refrigerated can get into and carry out the heat exchange with low temperature gas in the cold box, then the working medium gas gets back to in the turbo expansion unit again and cools off, every oil feeding station all links to each other with the turbo expansion unit that corresponds through fuel feed pipe and oil return pipe, make the oil feeding station can be for the oil feeding of corresponding turbo expansion unit. Before low-temperature gas liquefaction, the low-temperature gas is required to be sequentially subjected to heat exchange with working medium gas in each turboexpander unit so as to be cooled step by step.
The turboexpander set in the existing turboexpansion system only supplies oil to the turboexpander set by one oil supply station, and when a certain oil supply station fails suddenly and cannot supply oil, the turboexpander set corresponding to the oil supply station cannot work normally due to oil-free lubrication and cooling, so that the whole turboexpansion system cannot supply enough cold for low-temperature gas, and the low-temperature gas cannot be liquefied. The equipment costs of the system would be greatly increased if each turboexpander train were equipped with a backup oil supply station.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: a turboexpansion system for grouped low-temperature gas liquefaction, which enables each turboexpansion unit to operate reliably and stably, is provided.
In order to solve the above problem, the utility model discloses the technical scheme who adopts does: grouped turbo-expansion system for low-temperature gas liquefaction comprises: the cold box, a plurality of can provide the turboexpander set of cold volume for low temperature gas liquefaction, a plurality of and the fuel feeding station that can be turboexpander set circulation fuel feeding of each turboexpander set one-to-one, each turboexpander set links to each other with the cold box through the pipeline respectively, make the refrigerated working medium gas of expansion work in the turboexpander set can get into and carry out the heat exchange with low temperature gas in the cold box, then the working medium gas gets back to and cools off in the turboexpander set again, every fuel feeding station all links to each other with the turboexpander set that corresponds through fuel feed pipe and time return pipe, make fuel feeding station can be the turboexpander set fuel feeding that corresponds, its characterized in that: every two adjacent turboexpander sets are combined into a unit, when the number of the turboexpander sets combined to the rest is three, the rest three turboexpander sets are combined into a unit, two oil supply pipes corresponding to the two units with the number of the turboexpander sets are communicated through a pipeline with a valve, and two oil return pipes corresponding to the unit are communicated through a pipeline with a bidirectional pump; three oil supply pipes that the unit that turboexpander set quantity is three corresponds communicate each other through the pipeline of taking the valve, and three return oil pipes that this unit corresponds communicate each other through the pipeline of taking the two-way pump, still include: a central controller capable of controlling each valve and each bidirectional pump; the structure of the oil supply station includes: the oil tank is communicated with the inlet of the oil supply filter through a pipeline, the outlet of the oil supply filter is communicated with the inlet of the oil pump through a pipeline, the outlet of the oil return filter is communicated with the inlet of the oil tank through a pipeline, and the oil outlet of the oil-gas separation device is communicated with the inlet of the oil return filter through a pipeline; the structure of the turboexpander set comprises: the oil-gas compressor comprises an oil pressure accumulator, a lubricating oil cooler, a turbo expander, a gas return filter and a compressor, wherein the outlet of the oil pressure accumulator is communicated with an oil inlet pipe on the inlet of the lubricating oil cooler through a pipeline, the outlet of the lubricating oil cooler is communicated with the turbo expander through a pipeline, so that oil can enter an oil bearing cavity of the turbo expander for lubrication and enter a brake of the turbo expander for heat removal, the outlet of the gas return filter is communicated with the inlet of the compressor through a pipeline, the outlet of the compressor is communicated with a gas supply cavity in the turbo expander through a pipeline, so that the compressor can inject compressed gas into a labyrinth sealing area of the turbo expander for sealing an impeller, and a gas discharge cavity in the turbo expander is communicated with the inlet of the compressor through a pipeline; the oil pump export is used for being linked together with the oil inlet pipe on the lubricating oil cooler import through supplying oil pipe, and oil-gas separation device's oil inlet is used for being linked together with turbo expander through returning oil pipe for oil-gas mixture in the turbo expander can enter into oil-gas separation device and carry out oil-gas separation, and oil-gas separation device's gas outlet is used for being linked together with return air filter's import through the pipeline, makes the gas that oil-gas separation device separation oil gas obtained can enter into and filter in the return air filter.
Further, the above-mentioned grouped cryogenic gas liquefaction turbine expansion system, wherein: two oil supply pipes of three oil supply pipes corresponding to three units of the turboexpander set are respectively communicated with the rest oil supply pipe through a pipeline with a valve, and three oil return pipes corresponding to the units are communicated through two pipelines with bidirectional pumps according to the connection relation between the corresponding oil supply pipes.
Further, the above-mentioned grouped cryogenic gas liquefaction turbine expansion system, wherein: three oil supply pipes corresponding to three units of the turbo-expander set are respectively communicated through a pipeline with a valve, and three oil return pipes corresponding to the units are respectively communicated through a pipeline with a bidirectional pump.
Further, the above-mentioned grouped cryogenic gas liquefaction turbine expansion system, wherein: the unit with three turboexpander sets is positioned behind other units, so that the low-temperature gas finally enters the unit for heat exchange and cooling before liquefaction.
Further, the above-mentioned grouped cryogenic gas liquefaction turbine expansion system, wherein: each oil supply station is mounted on an independent prying block in a prying mode; each turboexpander train is skid-mounted on a separate skid.
Further, the above-mentioned grouped cryogenic gas liquefaction turbine expansion system, wherein: the oil cooler is a cooler capable of cooling oil by circulating water.
The utility model has the advantages that: after the turbo expansion systems of the utility model combine the turbo expansion units into each unit, when the oil supply station corresponding to each turbo expansion unit breaks down, the oil can be supplied through the oil supply stations corresponding to other turbo expansion units in the unit, thus ensuring that each turbo expansion unit can operate uninterruptedly, reliably and stably; in addition, the turbine expansion system of the utility model has simple and reliable structure and can be used in the civil field; due to the adoption of a skid-mounted structure, the hoisting transportation, the field installation and the equipment replacement are convenient, so that the layout of the device can be more compact and reasonable; the oil pressure accumulator can supply oil for the turboexpander for a period of time under oil-free emergency conditions such as sudden stop of an oil circuit system or damage of an oil pump, and the turboexpander is guaranteed to have enough time to be switched to supply oil by another oil supply station, so that damage to the turboexpander due to sudden oil-free operation is avoided.
Drawings
Fig. 1 is a schematic structural view of a grouped cryogenic gas liquefaction turboexpansion system according to the present invention.
Fig. 2 is a schematic view of the structure of the oil supply station shown in fig. 1.
Fig. 3 is a schematic view of the turboexpander set shown in fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
As shown in fig. 1, a staged cryogenic gas liquefaction turboexpansion system comprising: the system comprises a cold box 1, seven turboexpander sets 2 capable of providing cold energy for low-temperature gas liquefaction, and seven oil supply stations 3 which correspond to the turboexpander sets 2 one by one and can circularly supply oil to the turboexpander sets 2, wherein each turboexpander set 2 is connected with the cold box 1 through an air inlet pipe and an air return pipe respectively, so that working medium gas which is expanded and does work and is cooled in the turboexpander sets 2 can enter the cold box 1 to exchange heat with low-temperature gas, and then the working medium gas returns to the turboexpander sets 2 to be cooled, and the cold box 1 can be a large heat exchange box body or formed by connecting a plurality of small heat exchange box bodies through pipelines; each oil supply station 3 is connected with the corresponding turboexpander set 2 through an oil supply pipe 7 and an oil return pipe 8, every two adjacent turboexpander sets 2 are combined into a unit, and when the number of the remaining turboexpander sets 2 is three, the remaining three turboexpander sets 2 are combined into a unit, in the embodiment, the number of the two turboexpander sets 2 is two, and the number of the three turboexpander sets 2 is one; if the number of turboexpander trains 2 is even, then there will be no three turboexpander trains 2; two oil supply pipes 7 corresponding to two units of the turboexpander set 2 are communicated through a pipeline with a valve 4, and two oil return pipes 8 corresponding to the units are communicated through a pipeline with a bidirectional pump 5; three oil supply pipes 7 corresponding to three units of the turboexpander set 2 are communicated with each other through a pipeline with a valve 4, and three oil return pipes 8 corresponding to the units are communicated with each other through a pipeline with a bidirectional pump 5, and the turboexpander set further comprises: a central controller 6 capable of controlling each valve 4 and each bidirectional pump 5.
In this embodiment, the two left and right oil supply pipes 7 of the three oil supply pipes 7 corresponding to the unit having three turbo expander sets 2 are respectively communicated with the middle oil supply pipe 7 through a pipeline with the valve 4, and the three oil return pipes 8 corresponding to the unit are communicated with each other through two pipelines with the bidirectional pump 5 according to the connection relationship between the corresponding oil supply pipes 7, that is, the two left and right oil return pipes 8 are respectively communicated with the middle oil return pipe 8 through a pipeline with the bidirectional pump 5. In addition, in order to realize better mutual oil supply, the left oil supply pipe 7 and the right oil supply pipe 7 are communicated through a pipeline with a valve 4, and the left oil return pipe 8 and the right oil return pipe 8 are also communicated through a pipeline with a bidirectional pump 5.
In this embodiment, the three turboexpander trains 2 are located downstream of the other units so that the cold gas is finally passed to the units for heat exchange cooling before liquefaction. This is because the lower the temperature, the closer to the liquefaction temperature region, the more important it is for stable operation of the refrigeration process, and the unit with three turboexpander sets 2 has higher stability because of three oil supply stations 3 for supplying oil to each other, and can better satisfy the requirement of uninterrupted operation.
When a certain oil supply station 3 suddenly breaks down and cannot supply oil, the central controller 6 opens the valve 4 and the two-way pump 5 on the unit pipeline where the oil supply station 3 is located, so that other oil supply stations 3 in the unit can supply oil to the turbo expansion unit 2 corresponding to the oil supply station 3 which breaks down, and the two-way pump 5 is adopted to change the oil return direction according to the change of the oil supply direction on one hand and better convey the oil return back to the oil supply station 3 on the other hand, so that the oil return is prevented from being frozen due to low temperature. Under the normal condition, the oil supply station 3 and the turbine expansion unit 2 which supply oil correspondingly are arranged relatively close to each other, so that oil return between the two is relatively smooth, and a pump does not need to be arranged on an oil return pipeline; in a special case, the other oil supply station 3 for supplying oil to the turboexpander set 2 corresponds to the other turboexpander set 2, so that the arrangement between the two is relatively far, and a pump is required to be arranged on a pipeline for assisting oil return in order to ensure smooth oil return.
In the present embodiment, as shown in fig. 2 and 3, each oil supply station 3 is skid-mounted on a separate skid; each turboexpander set 2 is skid-mounted on a single skid block; after the corresponding equipment is skid-mounted together, the equipment can be integrated in a production workshop, and hoisting transportation, field installation and replacement are facilitated. The structure of the oil supply station 3 includes: the oil tank 32, the oil supply filter 33, the oil pump 34, the oil return filter 10 and the oil-gas separation device 9, wherein the outlet of the oil tank 32 is communicated with the inlet of the oil supply filter 33 through a pipeline, the outlet of the oil supply filter 33 is communicated with the inlet of the oil pump 34 through a pipeline, the outlet of the oil return filter 10 is communicated with the inlet of the oil tank 32 through a pipeline, and the oil outlet of the oil-gas separation device 9 is communicated with the inlet of the oil return filter 10 through a pipeline; the turbo expander train 2 is structured to include: the oil pressure accumulator 25, the lubricating oil cooler 26, the turbine expander 21, the return air filter 28 and the compressor 27, wherein the outlet of the oil pressure accumulator 25 is communicated with an oil inlet pipe 261 on the inlet of the lubricating oil cooler 26 through a pipeline, the lubricating oil cooler 26 is a cooler capable of cooling oil through circulating water, the outlet of the lubricating oil cooler 26 is communicated with the turbine expander 21 through a pipeline, so that the oil can enter an oil bearing cavity of the turbine expander 21 for lubrication and enter a brake of the turbine expander 21 for heat removal, the outlet of the return air filter 28 is communicated with the inlet of the compressor 27 through a pipeline, the outlet of the compressor 27 is communicated with a gas supply cavity in the turbine expander 21 through a pipeline, so that the compressor 27 can inject compressed gas into a labyrinth seal area of the turbine expander 21 for sealing an impeller, a gas discharge cavity in the turbine expander 21 is communicated with the inlet of the compressor 27 through a pipeline, so that the gas can be returned to the compressor 27 to be repressurized and then passed into the labyrinth seal area of the turboexpander 21; the outlet of the oil pump 34 is communicated with the oil inlet pipe 261 on the inlet of the lubricating oil cooler 26 through an oil supply pipe, the oil inlet of the oil-gas separation device 9 is communicated with the turbo expander 21 through an oil return pipe, so that the oil-gas mixture in the turbo expander 21 can enter the oil-gas separation device 9 for oil-gas separation, the gas outlet of the oil-gas separation device 9 is communicated with the inlet of the return-gas filter 28 through a pipeline, and the gas obtained by oil-gas separation of the oil-gas separation device 9 can enter the return-gas filter 28 for filtration.
The hydraulic accumulator 25 is manufactured according to the principle of energy storage and release of an energy accumulator, and when the oil pump 34 works, the oil pressure compresses the air in the accumulator tank, so that a compression air bag is formed at the top of the accumulator tank, and at the moment when the oil pump 34 is powered off or fails and stops working, the compression air bag in the accumulator tank begins to expand to form a pressure source, so that the oil in the accumulator tank is pressed out and supplied to the outside.
An oil circuit: a small part of oil in the oil tank 32 enters the tank of the oil pressure accumulator 25 to be stored and accumulated under the pumping action of the oil pump 34, while most of the oil is conveyed to the lubricating oil cooler 26 to be cooled, and then the cooled oil is injected into the oil bearing cavity of the turboexpander 21 to form a layer of oil film between the bearing and the shaft to lubricate the shaft, and the oil is also introduced into the brake of the turboexpander 21 to take away heat; because a labyrinth sealing area is arranged between the impeller and the bearing of the expansion machine, 1/5 sealing gas can be mixed into the bearing cavity and mixed with oil, the final discharge of the expansion machine is an oil-gas mixture which can be conveyed to an oil-gas separation device 9 for oil-gas separation, the separated oil can be re-injected into the oil tank 32 after being filtered by the oil return filter 10 and impurities such as fine metal particles, and the separated gas can be re-returned into the compressor 27 after being filtered by the gas return filter 28.
The oil pressure accumulator 25 can supply oil to the turboexpander 21 for a period of time under oil-free emergency conditions such as sudden stop of an oil circuit system or damage of an oil pump, and the like, so that the turboexpander 21 is guaranteed to have enough time to be switched to supply oil from another oil supply station, and the turboexpander 21 is prevented from being damaged due to sudden oil-free.
A gas loop: the compressed gas in the compressor 27 is generally the same gas as the cryogenic gas to be liquefied, and this is done on the one hand to save costs and on the other hand to simplify the plant structure; the compressor 27 injects the compressed gas into a labyrinth seal area between an impeller and a bearing installation cavity in the turbo expander 21 to seal the impeller, the seal impeller mainly functions to protect a bearing close to the impeller in the bearing installation cavity from low temperature from the impeller, a gas supply cavity and a gas discharge cavity are arranged in the labyrinth seal area, about 4/5 gas quantity can be recovered from the gas discharge cavity, the discharged gas is clean and has no residual oil, the residual 1/5 gas and oil in the bearing cavity are mixed and discharged to the oil-gas separation device 9 for oil-gas separation, the separated gas and the recovered gas are mixed and then returned to the compressor 27, and thus the gas for sealing can be recycled and waste is avoided.
Claims (6)
1. Grouped turbo-expansion system for low-temperature gas liquefaction comprises: the cold box, a plurality of can provide the turboexpander set of cold volume for low temperature gas liquefaction, a plurality of and the fuel feeding station that can be turboexpander set circulation fuel feeding of each turboexpander set one-to-one, each turboexpander set links to each other with the cold box through the pipeline respectively, make the refrigerated working medium gas of expansion work in the turboexpander set can get into and carry out the heat exchange with low temperature gas in the cold box, then the working medium gas gets back to and cools off in the turboexpander set again, every fuel feeding station all links to each other with the turboexpander set that corresponds through fuel feed pipe and time return pipe, make fuel feeding station can be the turboexpander set fuel feeding that corresponds, its characterized in that: every two adjacent turboexpander sets are combined into a unit, when the number of the turboexpander sets combined to the rest is three, the rest three turboexpander sets are combined into a unit, two oil supply pipes corresponding to the two units with the number of the turboexpander sets are communicated through a pipeline with a valve, and two oil return pipes corresponding to the unit are communicated through a pipeline with a bidirectional pump; three oil supply pipes that the unit that turboexpander set quantity is three corresponds communicate each other through the pipeline of taking the valve, and three return oil pipes that this unit corresponds communicate each other through the pipeline of taking the two-way pump, still include: a central controller capable of controlling each valve and each bidirectional pump; the structure of the oil supply station includes: the oil tank is communicated with the inlet of the oil supply filter through a pipeline, the outlet of the oil supply filter is communicated with the inlet of the oil pump through a pipeline, the outlet of the oil return filter is communicated with the inlet of the oil tank through a pipeline, and the oil outlet of the oil-gas separation device is communicated with the inlet of the oil return filter through a pipeline; the structure of the turboexpander set comprises: the oil-gas compressor comprises an oil pressure accumulator, a lubricating oil cooler, a turbo expander, a gas return filter and a compressor, wherein the outlet of the oil pressure accumulator is communicated with an oil inlet pipe on the inlet of the lubricating oil cooler through a pipeline, the outlet of the lubricating oil cooler is communicated with the turbo expander through a pipeline, so that oil can enter an oil bearing cavity of the turbo expander for lubrication and enter a brake of the turbo expander for heat removal, the outlet of the gas return filter is communicated with the inlet of the compressor through a pipeline, the outlet of the compressor is communicated with a gas supply cavity in the turbo expander through a pipeline, so that the compressor can inject compressed gas into a labyrinth sealing area of the turbo expander for sealing an impeller, and a gas discharge cavity in the turbo expander is communicated with the inlet of the compressor through a pipeline; the oil pump export is used for being linked together with the oil inlet pipe on the lubricating oil cooler import through supplying oil pipe, and oil-gas separation device's oil inlet is used for being linked together with turbo expander through returning oil pipe for oil-gas mixture in the turbo expander can enter into oil-gas separation device and carry out oil-gas separation, and oil-gas separation device's gas outlet is used for being linked together with return air filter's import through the pipeline, makes the gas that oil-gas separation device separation oil gas obtained can enter into and filter in the return air filter.
2. The staged cryogenic gas liquefaction turboexpansion system of claim 1, wherein: two oil supply pipes of three oil supply pipes corresponding to three units of the turboexpander set are respectively communicated with the rest oil supply pipe through a pipeline with a valve, and three oil return pipes corresponding to the units are communicated through two pipelines with bidirectional pumps according to the connection relation between the corresponding oil supply pipes.
3. The staged cryogenic gas liquefaction turboexpansion system of claim 1, wherein: three oil supply pipes corresponding to three units of the turbo-expander set are respectively communicated through a pipeline with a valve, and three oil return pipes corresponding to the units are respectively communicated through a pipeline with a bidirectional pump.
4. A staged cryogenic gas liquefaction turboexpansion system according to claim 1, 2 or 3, characterized in that: the unit with three turboexpander sets is positioned behind other units, so that the low-temperature gas finally enters the unit for heat exchange and cooling before liquefaction.
5. A staged cryogenic gas liquefaction turboexpansion system according to claim 1, 2 or 3, characterized in that: each oil supply station is mounted on an independent prying block in a prying mode; each turboexpander train is skid-mounted on a separate skid.
6. The staged cryogenic gas liquefaction turboexpansion system of claim 1, wherein: the oil cooler is a cooler capable of cooling oil by circulating water.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921305102.9U CN210483815U (en) | 2019-08-13 | 2019-08-13 | Grouped turbine expansion system for low-temperature gas liquefaction |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921305102.9U CN210483815U (en) | 2019-08-13 | 2019-08-13 | Grouped turbine expansion system for low-temperature gas liquefaction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112392555A (en) * | 2019-08-13 | 2021-02-23 | 江苏国富氢能技术装备有限公司 | Turbine expansion system for grouped low-temperature gas liquefaction |
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2019
- 2019-08-13 CN CN201921305102.9U patent/CN210483815U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112392555A (en) * | 2019-08-13 | 2021-02-23 | 江苏国富氢能技术装备有限公司 | Turbine expansion system for grouped low-temperature gas liquefaction |
| CN112392555B (en) * | 2019-08-13 | 2024-05-07 | 江苏国富氢能技术装备股份有限公司 | Group formula low temperature gas liquefaction is with turboexpansion system |
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Address after: 215600 No. 236, Guotai North Road, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: Jiangsu Guofu hydrogen energy technology equipment Co.,Ltd. Address before: Jiangsu Guofu hydrogen technology equipment Co., Ltd., No.19, Fuxin (Chenxin) road, yangshe Town, Zhangjiagang City, Suzhou City, Jiangsu Province, 215600 Patentee before: Jiangsu Guofu Hydrogen Energy Technology Equipment Co.,Ltd. |