CN212803350U - Natural gas station pressure regulating residual pressure power generation device - Google Patents
Natural gas station pressure regulating residual pressure power generation device Download PDFInfo
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- CN212803350U CN212803350U CN202020737620.4U CN202020737620U CN212803350U CN 212803350 U CN212803350 U CN 212803350U CN 202020737620 U CN202020737620 U CN 202020737620U CN 212803350 U CN212803350 U CN 212803350U
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Abstract
The utility model relates to a natural gas station pressure regulating residual pressure power generation facility, the device include import pre-heater, import trip valve, natural gas expansion generator, export heater, bypass air-vent valve, open bypass trip valve soon. Adopt the utility model discloses both reached the purpose of station yard pressure regulating, utilized the natural gas residual pressure to send a large amount of electric energy again. The natural gas station pressure regulating excess pressure generating set, the pressure regulating valve and the excess pressure generating set are arranged in parallel. The natural gas is not consumed in the power generation process of the expansion generator, and the natural gas is depressurized and cooled. The cold energy of the low-temperature natural gas can be comprehensively utilized, and a large amount of electric energy consumed by mechanical refrigeration is reduced. The natural gas station pressure regulating residual pressure power generation device has the advantages of good economic benefit, investment saving, energy conservation and environmental protection, high reliability, small occupied area and capability of ensuring the long-term stable operation of the device, and is particularly suitable for stations with large pressure difference and large natural gas flow, such as natural gas pipelines, branch transmission stations, pressure regulating stations, city gate stations, gas storage warehouses and the like.
Description
Technical Field
The residual pressure utilization power generation device applied to the natural gas pressure regulating process belongs to a new energy power generation device. In the process, circulating water, exhaust gas and other low-grade heat sources are adopted to heat natural gas entering the device, the heated natural gas enters an expansion generator to generate power, and low-temperature natural gas out of the expansion generator is heated with the circulating water, exhaust gas and other low-grade heat sources or refrigerants for ice making and refrigeration houses and then is discharged from the device. The device can be widely applied to stations with large pressure difference and large natural gas flow, such as pipelines, branch transmission stations, pressure regulating stations, city gate stations, gas storage reservoirs and the like, and is arranged in parallel with the pressure regulating valve of the station. Because no natural gas is consumed, the generating capacity is large, the cold energy generated by natural gas depressurization can be comprehensively utilized, the investment is low, and the economic benefit is good.
Background
The mileage of the natural gas long-distance pipeline in 2018 years in China is 7.6 kilometers, and the length of the natural gas pipeline in 2028 years in China is estimated to reach 15 kilometers. The natural gas consumption is high-speed to increase, and the pressure regulating valve is generally adopted in the pressure regulating of stations such as present natural gas pipe network distribution station, city gate station, etc., and natural gas pressure energy is wasted and is not utilized. For example, the comprehensive utilization of the pressure energy of natural gas pipe network station can produce huge energy and economic benefits.
When natural gas enters an expansion generator for power generation, the natural gas is depressurized, pressure energy is converted into mechanical energy, and the mechanical energy is converted into electric energy; when the natural gas is depressurized, the natural gas is required to be cooled due to the Joule-Thomson effect, and the low-temperature natural gas discharged from the expansion machine carries a huge amount of cold energy which can be used in various fields such as refrigeration houses and central air-conditioning refrigeration. The natural gas station pressure regulating residual pressure power generation device not only effectively recovers and utilizes the wasted pressure energy, but also reduces a large amount of electric energy consumed by mechanical refrigeration, and has considerable economic benefit.
Disclosure of Invention
1. The invention adopts low-grade heat sources such as circulating water, exhaust gas and the like to heat natural gas entering the device, the heated natural gas enters the expansion generator to generate power, and the low-temperature natural gas out of the expansion generator is heated by heat exchange with the circulating water, the exhaust gas or a refrigerant of an ice making and cold storage warehouse and then is discharged from the device. The system is particularly suitable for stations with large pressure difference and large natural gas flow, such as pipeline stations, distribution stations, pressure regulating stations, urban gate stations, gas storage reservoirs and the like. The natural gas station pressure regulating residual pressure generating set mainly comprises 7 parts:
1) inlet preheater
2) Inlet shut-off valve
3) Natural gas expansion generator
4) Outlet heater
5) Bypass pressure regulating valve
6) Quick-opening bypass cut-off valve
7) Quick-opening bypass regulating valve
2. The functions and the functions of all components of the technical scheme of the invention
1) Inlet preheater
The natural gas heating device is used for heating natural gas fed into the device by low-grade heat sources such as circulating water, exhaust gas and the like, and prevents the natural gas from forming liquid drops after the temperature is lower than the dew point of the natural gas when the natural gas is subjected to pressure reduction, expansion and power generation and is cooled, so that an expansion power generator is damaged. The inlet preheater adopts a plate type or plate fin type heat exchanger and is made of S30438 or 3003-O.
2) Inlet shut-off valve
When the pressure-regulating residual pressure generating set breaks down, the inlet cut-off valve of the expansion machine is closed emergently. Meanwhile, a cut-off valve of the flow regulating pipeline is quickly opened, so that natural gas passes through a bypass, the pressure fluctuation of the device is ensured to be not more than 0.3MPa/min, the upstream device is ensured not to stop, and the running pressure is stable. The turn-off time of the inlet cut-off valve is less than or equal to 1s, and the inlet cut-off valve is driven by hydraulic pressure.
3) Natural gas expansion generator
The device is used for converting the pressure energy of the natural gas into mechanical energy and then converting the mechanical energy into electric energy. The natural gas expansion generator consists of an expander, a gearbox, a coupling, a generator, a dry gas sealing system, a lubricating oil system, a power distribution system and a PLC (programmable logic controller) control system, wherein the explosion-proof grade of all instruments and instrument equipment is not lower than Exd II BT4Gb, and corresponding products are produced in China and imported.
High-pressure natural gas enters the expander from the variable nozzle of the natural gas expansion generator along the tangential direction, part of the natural gas expansion is completed in the nozzle, and the other part of the natural gas is expanded on the impeller in an isentropic manner, so that energy conversion is realized, work is completed, the closed impeller is driven to rotate at a high speed, and then the low-pressure and low-temperature natural gas is discharged from the diffuser; the impeller rotates to drive the high-speed coupling, the rotating speed is adjusted through the gear reduction box, and then the gear reduction box drives the generator to generate electricity through the low-speed coupling.
The expander and the gearbox are isolated by the oil seal and the dry gas seal, and oil-free transmission of natural gas is ensured. The PLC control system is responsible for the functions of process and equipment parameter detection, alarm, control, interlocking protection and the like of the whole unit (including a dry gas seal and lubricating oil system).
4) Outlet heater
The low-temperature natural gas heating device is used for heating low-grade heat sources such as circulating water, exhaust gas or refrigerants of ice making, a refrigeration house and a central air conditioner to obtain low-temperature natural gas, prevents the temperature of the natural gas from being lower than the allowable temperature of pipeline materials, effectively recovers and utilizes low-temperature cold energy, and reduces a large amount of electric energy consumed by mechanical refrigeration. The outlet heater adopts a plate type or plate-fin type heat exchanger and is made of S30438 or 3003-O.
5) Bypass pressure regulating valve
The voltage regulating device is used for regulating voltage of a station site when the voltage regulating excess voltage generating device fails and is connected with the voltage regulating excess voltage generating device in parallel. The bypass pressure regulating valve adopts a pneumatic regulating valve.
6) Quick-opening bypass cut-off valve
When the pressure-regulating residual pressure power generation device breaks down, the stop valve at the inlet of the expansion machine is closed emergently, and the quick-opening bypass stop valve is opened quickly, so that natural gas passes through the quick-opening bypass, the pressure fluctuation of the device is not more than 0.3MPa/min, the upstream device is ensured not to stop, and the running pressure is stable. The turn-off time of the inlet cut-off valve is less than or equal to 1s, and the quick-opening bypass cut-off valve is driven by hydraulic pressure.
7) Quick-opening bypass regulating valve
When the pressure regulating residual pressure power generation device breaks down, the inlet stop valve of the expansion machine is closed emergently, and the quick-opening bypass stop valve is opened quickly, so that the natural gas is regulated by the quick-opening bypass regulating valve from the bypass, and the natural gas is passed through the quick-opening bypass. The pressure fluctuation of the device is ensured to be not more than 0.3MPa/min, the upstream device is not stopped, and the operation pressure is stable. The quick-opening bypass regulating valve adopts a pneumatic regulating valve.
3. Application of the invention
The invention can be widely applied to stations with large pressure difference and large natural gas flow, such as pipelines, branch transmission stations, pressure regulating stations, city gate stations, gas storage banks and the like, and is arranged in parallel with the pressure regulating valve. And (3) reducing the pressure and the temperature of the natural gas in the power generation process of the natural gas in the expansion generator. The cold energy of the low-temperature natural gas can be used for cooling circulating water and exhaust gas or in the fields of refrigeration houses, ice making, central air-conditioning refrigeration and the like.
Through pressure regulating excess pressure power generation facility, the station natural gas had both reached the purpose of pressure regulating, utilized the natural gas excess pressure to send a large amount of electric energy again, owing to do not consume the natural gas, can utilize the produced cold energy of natural gas step-down comprehensively simultaneously, reduced a large amount of electric energy of mechanical refrigeration consumption, so pressure regulating excess pressure power generation facility has considerable economic benefits.
The natural gas station pressure regulating excess pressure power generation device has the advantages of investment saving, energy saving, environmental protection (no natural gas consumption), high reliability, small occupied area and capability of ensuring the long-term stable operation of the device, and is particularly suitable for stations with large pressure difference and large natural gas flow, such as natural gas pipelines, branch transmission stations, pressure regulating stations, city gate stations, gas storage warehouses and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 1-inlet preheater; 2-inlet shut-off valve; 3-natural gas expansion generator; 4-an outlet heater; 5-bypass pressure regulating valve; 6-quickly opening a bypass cut-off valve; 7-quick opening bypass regulating valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
A natural gas station pressure regulating residual pressure generating device is shown in figure 1, and comprises an inlet preheater 1; an inlet shut-off valve 2; a natural gas expansion generator 3; an outlet heater 4; a bypass pressure regulating valve 5; a bypass cut-off valve 6 is opened quickly; the bypass cut-off valve 7 is opened quickly.
After the normal-temperature high-pressure natural gas enters the pressure-regulating residual-pressure power generation device through the station pipeline, the natural gas exchanges heat with low-grade heat sources such as circulating water and exhaust gas at the inlet preheater 1, the natural gas entering the device is heated, and liquid drops are prevented from being formed after the temperature is lower than the dew point of the natural gas when the natural gas is subjected to pressure reduction, expansion and power generation and is cooled, so that an expansion power generator is damaged. The inlet preheater adopts a plate type or plate fin type heat exchanger and is made of S30438 or 3003-O.
The heated high-pressure natural gas enters a natural gas expansion generator 3 through an inlet cut-off valve 2, the high-pressure natural gas enters an expansion machine from a variable nozzle of the natural gas expansion generator along the tangential direction, part of the natural gas expansion is completed in the nozzle, and the other part of the natural gas is subjected to isentropic expansion on an impeller to realize energy conversion, complete work application and drive a closed impeller to rotate at a high speed, and then the low-pressure and low-temperature natural gas is discharged from a diffuser; the impeller rotates to drive the high-speed coupling, the rotating speed is adjusted through the gear reduction box, and then the gear reduction box drives the generator to generate electricity through the low-speed coupling. The expander and the gearbox are isolated by the oil seal and the dry gas seal, and oil-free transmission of natural gas is ensured. The PLC control system is responsible for the functions of process and equipment parameter detection, alarm, control, interlocking protection and the like of the whole unit (including a dry gas seal and lubricating oil system).
After the low-pressure and low-temperature natural gas is discharged from the natural gas expansion generator 3, the low-pressure and low-temperature natural gas exchanges heat with low-grade heat sources such as circulating water, exhaust gas or refrigerants of ice making, a refrigeration house and a central air conditioner at the outlet heater 4, and the low-pressure and low-temperature natural gas is heated and then discharged out of the device. The temperature of the natural gas discharged from the device is prevented from being lower than the allowable temperature of the pipeline material, and meanwhile, the low-temperature cold energy is effectively recycled and utilized, so that a large amount of electric energy consumed by mechanical refrigeration is reduced. The outlet heater adopts a plate type or plate-fin type heat exchanger and is made of S30438 or 3003-O.
The bypass pressure regulating valve 5 adopts a pneumatic regulating valve, is used for regulating the pressure of a station when the pressure excess pressure generating set fails, and is connected with the pressure regulating excess pressure generating set in parallel. The bypass pressure regulating valve adopts a pneumatic regulating valve.
When the quick-opening bypass cut-off valve 6 and the quick-opening bypass regulating valve 7 are used for self fault of the pressure regulating residual pressure power generation device, the inlet cut-off valve of the expansion machine is closed emergently, and meanwhile, the quick-opening bypass cut-off valve is opened quickly, so that natural gas passes through the quick-opening bypass, the pressure fluctuation of the device is ensured not to exceed 0.3MPa/min, the upstream device is ensured not to stop, and the operating pressure is stable. The turn-off time of the inlet cut-off valve is less than or equal to 1s, the quick-opening bypass cut-off valve adopts a hydraulic drive valve, and the quick-opening bypass regulating valve adopts a pneumatic regulating valve.
The natural gas station pressure regulating and residual pressure generating device comprises an inlet preheater 1, an inlet shut-off valve 2, a natural gas expansion generator 3, an outlet heater 4, a bypass pressure regulating valve 5, a quick-opening bypass shut-off valve 6 and a quick-opening bypass regulating valve 7 in the attached drawing 1, wherein all devices and pipelines are installed on the same skid plate, and a set of complete natural gas station pressure regulating and residual pressure generating device is formed.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. Natural gas station field pressure regulating residual pressure power generation facility, its characterized in that: the device comprises an inlet preheater, an inlet cut-off valve, a natural gas expansion generator, an outlet heater, a bypass pressure regulating valve, a quick-opening bypass cut-off valve and a quick-opening bypass regulating valve; all the devices and pipelines are installed on the same skid plate to form a set of complete natural gas station pressure regulating and residual pressure generating device.
2. The natural gas station pressure-regulating residual pressure power generation device according to claim 1, characterized in that: the natural gas station pressure regulating residual pressure generating set is arranged in parallel with a bypass pressure regulating valve of the natural gas station, the bypass pressure regulating valve is closed under normal working conditions, and the pressure regulating residual pressure generating set realizes the functions of pressure regulation and residual pressure generation.
3. The natural gas station pressure-regulating residual pressure power generation device according to claim 1, characterized in that: the natural gas exchanges heat with low-grade heat sources such as circulating water and exhaust gas at an inlet preheater, the natural gas entering the device is heated, and liquid drops formed after the temperature is lower than the dew point of the natural gas when the natural gas is subjected to pressure reduction, expansion and power generation and is cooled are prevented from damaging an expansion power generator.
4. The natural gas station pressure-regulating residual pressure power generation device according to claim 1, characterized in that: after the low-pressure and low-temperature natural gas is discharged from the natural gas expansion generator, the low-pressure and low-temperature natural gas exchanges heat with low-grade heat sources such as circulating water, exhaust gas or refrigerants for ice making, a refrigeration house and a central air conditioner at an outlet heater, and the low-pressure and low-temperature natural gas is heated and then discharged out of the device; the temperature of the natural gas discharged from the device is prevented from being lower than the allowable temperature of the pipeline material.
5. The natural gas station pressure-regulating residual pressure power generation device according to claim 1, characterized in that: the device is provided with a quick-opening bypass cut-off valve and a quick-opening bypass regulating valve, and when the device breaks down, the inlet of the expansion machine is closed emergently, and meanwhile, the bypass is opened quickly, so that the pressure stability of the device is ensured.
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| CN202020737620.4U CN212803350U (en) | 2020-05-08 | 2020-05-08 | Natural gas station pressure regulating residual pressure power generation device |
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| CN202020737620.4U CN212803350U (en) | 2020-05-08 | 2020-05-08 | Natural gas station pressure regulating residual pressure power generation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115788612A (en) * | 2022-12-12 | 2023-03-14 | 东方电气集团东方汽轮机有限公司 | Pipeline system and start-stop mode of differential pressure turboexpander set |
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2020
- 2020-05-08 CN CN202020737620.4U patent/CN212803350U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115788612A (en) * | 2022-12-12 | 2023-03-14 | 东方电气集团东方汽轮机有限公司 | Pipeline system and start-stop mode of differential pressure turboexpander set |
| CN115788612B (en) * | 2022-12-12 | 2024-06-11 | 东方电气集团东方汽轮机有限公司 | Start-stop mode of differential pressure turbine expansion unit |
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