A gas turbine power plant natural gas pressure regulating station and working method thereof

Abstract

The present application relates to the technical fields of gas turbine power plant, and provides a gas turbine power plant natural gas pressure regulating station and a working method thereof, which comprises a gas supply main pipe unit, a component platform pressure regulating station and a plurality of double-unit pressure regulating stations arranged in parallel with the component platform pressure regulating station; the double-unit pressure regulating station comprises a booster, a dew point heating unit, two water pump units arranged in parallel, two pressure regulating units arranged in parallel, two outlet units arranged in parallel, and an inlet unit, a metering unit, a cyclone separation unit and a fine filtration unit connected in sequence; the inlet unit is connected to the gas supply main pipe unit, each outlet unit is connected to one pressure regulating unit, the two pressure regulating units are both connected to the dew point heating unit, the booster and the dew point heating unit are both connected to the fine filtration unit, and the two water pump units are arranged on the backwater pipelines of the dew point heating unit respectively. The parallel operation of two units is realized, and more importantly, the expansion of the double-unit pressure regulating station can be realized to realize the parallel operation of more units.

Description

Technical Field

[0001] This invention relates to the field of gas turbine power plant technology, and in particular to a natural gas pressure regulating station for a gas turbine power plant and its operating method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Natural gas pressure regulating stations (hereinafter referred to as pressure regulating stations) are important equipment in gas turbine power plants. However, most current natural gas pressure regulating stations use a single station (two units), which cannot achieve parallel operation of multiple units. Moreover, the current single pressure regulating station setup makes it difficult to expand the number of units. In addition, pressure regulating stations with multiple units operating in parallel will inevitably cause safety issues, difficulties in maintenance and repair, and high engineering costs due to the large number of units. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a natural gas pressure regulating station for gas turbine power plants and its operating method. It combines the inlet unit, metering unit, cyclone separator unit, fine filtration unit, and dew point heating unit of two units in a dual-unit pressure regulating station, while separating the water pump unit, pressure regulating unit, and outlet unit. This enables parallel operation of the two units and saves equipment costs. More importantly, the dual-unit pressure regulating station is set up in parallel with the gas supply main pipeline unit, allowing for the expansion of the dual-unit pressure regulating station to achieve parallel operation of four or even more units.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The first aspect of this invention provides a natural gas pressure regulating station for a gas turbine power plant.

[0007] A natural gas pressure regulating station for a gas turbine power plant includes a gas supply main pipeline unit, a component pressure regulating station, and several dual-unit pressure regulating stations arranged in parallel with the component pressure regulating station; the dual-unit pressure regulating station includes a booster compressor, a dew point heating unit, two parallel water pump units, two parallel pressure regulating units, two parallel outlet units, and an inlet unit, a metering unit, a cyclone separator unit, and a fine filtration unit connected in sequence.

[0008] The inlet unit is connected to the gas supply main pipe unit, each outlet unit is connected to a pressure regulating unit, both pressure regulating units are connected to the dew point heating unit, the booster and the dew point heating unit are both connected to the fine filtration unit, and two water pump units are respectively arranged on the return water pipe of the dew point heating unit.

[0009] Furthermore, a booster compressor is installed on one side of the component platform pressure regulating station, and the fine filtration unit in the dual-unit pressure regulating station closest to the component platform pressure regulating station is also connected to the booster compressor on one side of the component platform pressure regulating station.

[0010] Furthermore, the dual-unit pressure regulating station closest to the component pressure regulating station also includes a start-up boiler electric heater unit and a start-up boiler pressure regulating unit connected in sequence, wherein the start-up boiler electric heater unit is connected to the fine filtration unit.

[0011] Furthermore, the component station pressure regulating station includes a component station inlet unit, a component station metering unit, a component station cyclone separator unit, and a component station fine filtration unit connected in sequence, as well as a component station dew point heating unit and a component station booster connected to the component station fine filtration unit, and a component station pressure regulating unit connected to the component station dew point heating unit.

[0012] Furthermore, it also includes a venting tower;

[0013] The natural gas venting pipelines of the component pressure regulating station and the dual-unit pressure regulating station are centrally connected to the venting tower.

[0014] Furthermore, all dual-unit pressure regulating stations are located on the first side of the component platform pressure regulating station, while the second side of the component platform pressure regulating station houses the metering station instrument room, hot water boiler room, power distribution room, electronic equipment room, and nitrogen generator room.

[0015] Furthermore, a pressure stabilizing tank is installed within the outlet unit to stabilize natural gas pressure fluctuations.

[0016] Furthermore, the inlet unit is equipped with a fire alarm shut-off valve to cut off the flow of natural gas into the pressure regulating station in the event of a fire.

[0017] Furthermore, the inlet unit, metering unit, and cyclone separation unit are located on a straight line, and the straight line where the inlet unit is located, the fine filtration unit, and the dew point heating unit are parallel to each other, with two parallel water pump units located on the first side of the dew point heating unit.

[0018] Each outlet unit and its connected pressure regulating unit are located on the same straight line and are positioned on the second side of the dew point heating unit;

[0019] The booster is located on the second side of the fine filtration unit and is parallel to the straight line where the outlet unit is located.

[0020] The second aspect of the present invention provides a method for operating a natural gas pressure regulating station in a gas turbine power plant as described in the first aspect, comprising the following steps:

[0021] The natural gas in the gas supply main unit flows sequentially through the inlet unit, metering unit, cyclone separator unit and fine filter unit, then flows through the booster compressor and the dew point heating unit.

[0022] After passing through the three-dew-point heating unit, the flow splits into two paths, which flow through two pressure regulating units and then into two outlet units.

[0023] The return water from the dew point heater is pressurized by two pump units and then returned to the waste heat boiler.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The natural gas pressure regulating station for a gas turbine power plant described in this invention combines the inlet unit, metering unit, cyclone separator unit, fine filtration unit, and dew point heating unit of two units in a dual-unit pressure regulating station, while separating the water pump unit, pressure regulating unit, and outlet unit. This enables the parallel operation of the two units and saves equipment costs. More importantly, the dual-unit pressure regulating station is set up in parallel with the gas supply main pipeline unit, which allows for the expansion of the dual-unit pressure regulating station to achieve a pressure regulating station with four or even more units operating in parallel.

[0026] 2. The natural gas pressure regulating station for gas turbine power plants described in this invention has a compact layout, reasonable functional zoning, and is adapted to the construction sequence of pressure regulating stations.

[0027] 3. The natural gas pressure regulating station for a gas turbine power plant described in this invention has all its natural gas booster compressors arranged on one side of the station, which facilitates the construction of maintenance roads and makes it convenient to maintain the booster compressors.

[0028] 4. In the natural gas pressure regulating station of the gas turbine power plant described in this invention, the nitrogen generator, the supporting equipment of the natural gas booster, is arranged in a safe area. The nitrogen generator can be a non-explosion-proof device, which reduces procurement costs and improves safety.

[0029] 5. The natural gas pressure regulating station for a gas turbine power plant described in this invention has its hot water boiler room located close to the dew point heater unit, which can shorten the length of the hot water pipeline between the hot water boiler room and the dew point heater unit and reduce pipeline resistance. Attached Figure Description

[0030] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention and do not constitute an improper limitation of the invention.

[0031] Figure 1 This is a structural diagram of the natural gas pressure regulating station of the gas turbine power plant according to Embodiment 1 of the present invention. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] In this invention, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any component or element in this invention. They should not be construed as limiting the invention.

[0036] In this invention, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0037] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0038] Terminology Explanation:

[0039] Gas turbine power plants: Gas turbine power plants are generally divided into two categories: simple cycle gas turbine power plants and gas-steam combined cycle power plants, which are collectively referred to as gas turbine power plants.

[0040] Pressure regulating station: A centralized area in a gas supply system that is used for functions such as gas pressure reduction or boosting, pressure stabilization, metering, cleaning, and heating, including buildings and structures, equipment, instruments, pipelines and accessories within the centralized area.

[0041] Example 1

[0042] Embodiment 1 of the present invention provides a natural gas pressure regulating station for a gas turbine power plant.

[0043] This embodiment provides a natural gas pressure regulating station for a gas turbine power plant, such as... Figure 1 As shown, this is the area between the main body of the pressure regulating station and its auxiliary equipment.

[0044] The main body of the pressure regulating station is divided into three areas according to function: the component pressure regulating station and several dual-unit pressure regulating stations set up in parallel with the component pressure regulating station.

[0045] In this embodiment, taking two dual-unit pressure regulating stations as an example, the pressure regulating stations of Unit 3 and Unit 4 constitute one dual-unit pressure regulating station, and the pressure regulating stations of Unit 1 and Unit 2 constitute one dual-unit pressure regulating station.

[0046] Assume that axis 1, axis 2, axis 11, and axis 12 are arranged sequentially from the first direction (west) to the second direction (east), and are parallel to each other. All four axes are located within a rectangular fence.

[0047] The area between the first axis 1 and the second axis 2 is the component station pressure regulating station, mainly including the gas supply main pipe unit 45, the component station inlet unit 3, the component station metering unit 4, the component station cyclone separator unit 5, the component station fine filtration unit 6, the component station dew point heating unit 7, the component station booster compressor 8, and the component station pressure regulating unit 9. The gas supply main pipe unit 45 is located on the northernmost side of the enclosure. The component station inlet unit 3, the component station metering unit 4, the component station cyclone separator unit 5, and the component station fine filtration unit 6 are connected sequentially from north to south and are in a straight line after connection; the component station dew point heating unit 7 is located to the west of the component station inlet unit 3, the component station metering unit 4, the component station cyclone separator unit 5, and the component station fine filtration unit 6; the component station pressure regulating unit 9 is located to the west of the component station dew point heating unit 7; and the component station booster compressor 8 is located to the south of the component station pressure regulating unit 9, the component station dew point heating unit 7, and the component station fine filtration unit 6.

[0048] The area between the first axis 1 and the second axis 2 is where the No. 3 unit pressure regulating station and the No. 4 unit pressure regulating station's No. 3 unit booster compressor 20 are located. The No. 3 unit booster compressor 20 is located south of the component platform booster compressor 8.

[0049] The area between the second axis 2 and the third axis 11 is the pressure regulating station for Unit 3 and Unit 4, mainly including the inlet unit 13 of Units 3 and 4, the metering unit 14 of Units 3 and 4, the cyclone separator unit 15 of Units 3 and 4, the fine filtration unit 16 of Units 3 and 4, the dew point heating unit 17 of Units 3 and 4, the water pump unit 18 of Unit 3, the pressure regulating unit 19 of Unit 3, the booster compressor unit 20 of Unit 3, the outlet unit 21 of Unit 3, the water pump unit 22 of Unit 4, the pressure regulating unit 23 of Unit 4, the booster compressor unit 24 of Unit 4, the outlet unit 25 of Unit 4, the start-up boiler electric heater unit 26, and the start-up boiler pressure regulating unit 27. The inlet unit 13 of Units 3 and 4, the metering unit 14 of Units 3 and 4, and the cyclone separator unit 15 of Units 3 and 4 are connected sequentially from north to south and are aligned in a straight line after connection. The fine filtration unit 16 of Units 3 and 4 is located to the east of the metering unit 14 and the cyclone separator unit 15 of Units 3 and 4. The dew point heating unit 17 of Units 3 and 4 is located to the east of the fine filtration unit 16 of Units 3 and 4. The water pump unit 18 of Unit 3 is located to the north of the dew point heating unit 17 of Units 3 and 4. The water pump unit 22 of Unit 4 is located to the north of the water pump unit 18 of Unit 3. The booster compressor 24 of Unit 4 is located to the south of the cyclone separator unit 15 and the fine filtration unit 16 of Units 3 and 4. The pressure regulating unit 23 and the outlet unit 25 of Unit 4 are connected sequentially from north to south and are located in a straight line, both located to the south of the dew point heating unit 17 of Units 3 and 4. The pressure regulating unit 19 and outlet unit 21 of Unit 3 are connected sequentially from north to south, and are located in a straight line, both south of the dew point heating unit 17 of Units 3 and 4. The start-up boiler electric heater unit 26 and pressure regulating unit 27 are connected sequentially from north to south, and are located in a straight line, both south of the dew point heating unit 17 of Units 3 and 4. The pressure regulating unit 23 of Unit 4, the pressure regulating unit 19 of Unit 3, and the start-up boiler electric heater unit 26 are arranged sequentially from west to east, and are parallel to each other.

[0050] The area between the third axis 11 and the fourth axis 12 is the pressure regulating station for Unit 1 and Unit 2, mainly including the inlet unit 28, metering unit 29, cyclone separator unit 30, fine filtration unit 31, dew point heating unit 32, water pump unit 33, pressure regulating unit 34, outlet unit 35, water pump unit 36, pressure regulating unit 37, booster compressor 38, and outlet unit 39 of Unit 2. The inlet unit 28, metering unit 29, and cyclone separator unit 30 of Unit 1 and Unit 2 are connected sequentially from north to south and are aligned in a straight line. The fine filtration unit 31 of Units 1 and 2 is located to the east of the metering unit 29 and the cyclone separator unit 30 of Units 1 and 2. The dew point heating unit 32 of Units 1 and 2 is located to the east of the fine filtration unit 31 of Units 1 and 2. The water pump unit 33 of Unit 1 is located to the north of the dew point heating unit 32 and the fine filtration unit 31 of Units 1 and 2. The water pump unit 36 ​​of Unit 2 is located to the north of the water pump unit 33 of Unit 1. The booster compressor 38 of Unit 2 is located to the south of the cyclone separator unit 30 and the fine filtration unit 31 of Units 1 and 2. The pressure regulating unit 37 and the outlet unit 39 of Unit 2 are connected sequentially from north to south, located in a straight line, and both are located to the south of the dew point heating unit 32 of Units 1 and 2. The pressure regulating unit 34 and the outlet unit 35 of Unit 1 are connected sequentially from north to south and are located in a straight line. Both are located south of the dew point heating unit 32 of Units 1 and 2. The pressure regulating unit 34 of Unit 1 is located east of the pressure regulating unit 37 of Unit 2, and the two are parallel.

[0051] The venting pipes of the component pressure regulating station, the pressure regulating station of Unit 1, the pressure regulating station of Unit 2, the pressure regulating station of Unit 3, and the pressure regulating station of Unit 4 are all connected to the venting tower 10. The venting tower 10 is located on the northwest side of the main body of the pressure regulating station.

[0052] Gas supply main pipe unit 45: mainly includes isolation ball valve, which is used to close the isolation ball valve and cut off the upstream natural gas supply when the entire pressure regulating station is under maintenance.

[0053] Venting Tower 10: The natural gas venting pipeline of the pressure regulating station is connected to the venting tower, through which the gas is discharged into the air.

[0054] Inlet units (component station inlet unit 3, unit 3 and 4 inlet unit 13, unit 1 and 28 inlet unit): mainly include fire alarm shut-off valves (also known as ESD valves), which are used to quickly close the ESD valves in the event of a fire at the pressure regulating station, cutting off upstream natural gas from entering the pressure regulating station and preventing the accident from escalating.

[0055] Metering units (component metering unit 4, unit 3 and 4 metering unit 14, unit 1 and 29 metering unit): mainly include ultrasonic flow meters, which are used to measure natural gas consumption.

[0056] Cyclone separation unit (component 5 cyclone separation unit, unit 15 cyclone separation unit for units 3 and 4, and unit 30 cyclone separation unit for units 1 and 2): mainly includes cyclone separators, which are used to remove large solid particles and large liquid droplets from natural gas.

[0057] Fine filtration unit (component table fine filtration unit 6, unit 3 and 4 fine filtration unit 16, unit 1 and 2 fine filtration unit 31): mainly includes baffle condensing filter, which is used to remove fine solid particles and small droplets from natural gas.

[0058] Dew point heating units (Dew point heating unit 7 on the component platform, dew point heating unit 17 for units 3 and 4, and dew point heating unit 32 for units 1 and 2): mainly include dew point heaters, whose function is to heat natural gas. The heat source for the dew point heaters is hot water from the waste heat boiler, which is used to heat the natural gas.

[0059] Pressure regulating unit (component panel pressure regulating unit 9, Unit 3 pressure regulating unit 19, Unit 4 pressure regulating unit 23, Unit 1 pressure regulating unit 34, Unit 2 pressure regulating unit 37): mainly includes pressure regulators, whose function is to reduce and stabilize the pressure of natural gas to meet the gas turbine's requirements for natural gas pressure.

[0060] Booster compressors (component platform booster compressor 8, Unit 3 booster compressor 20, Unit 4 booster compressor 24, Unit 2 booster compressor 38): These mainly consist of centrifugal booster compressors, whose function is to pressurize natural gas to meet the gas turbine's pressure requirements. It should be noted that Unit 1 requires lower natural gas pressure and therefore does not require a booster compressor. Component platform booster compressors and pressure regulating units are connected in parallel with Units 2, 3, and 4. When the incoming natural gas pressure is low, it needs to be pressurized by the booster compressor; when the incoming natural gas pressure is high, it needs to be reduced by the pressure regulating unit. Even the lowest incoming natural gas pressure is higher than the pressure required by Unit 1, therefore Unit 1 only requires a pressure regulating unit.

[0061] Pump units (Pump unit 18 for Unit 3, Pump unit 22 for Unit 4, Pump unit 33 for Unit 1, and Pump unit 36 ​​for Unit 2): mainly include booster pumps, whose function is to pressurize the return water from the dew point heater and return it to the waste heat boiler.

[0062] The outlet units (outlet unit 21 of Unit 3, outlet unit 25 of Unit 4, outlet unit 35 of Unit 1, and outlet unit 39 of Unit 2) mainly include pressure stabilizing tanks, which are used to stabilize natural gas pressure fluctuations and meet the gas turbine's requirements for natural gas pressure fluctuations.

[0063] The start-up boiler electric heater unit 26 and the start-up boiler pressure regulating unit 27 are unique to start-up boilers.

[0064] Start-up boiler electric heater unit 26: mainly includes an electric heater, which is used to heat natural gas.

[0065] Boiler start-up pressure regulating unit 27: mainly includes a pressure regulator, which is used to reduce and stabilize the pressure of natural gas to meet the natural gas pressure requirements of the boiler during startup.

[0066] The operating logic of a natural gas pressure regulating station in a gas turbine power plant provided in this embodiment is as follows:

[0067] The upstream natural gas is supplied to three pressure regulating stations via the gas supply main pipeline unit 45, namely, the component pressure regulating station, the No. 3 unit pressure regulating station, the No. 4 unit pressure regulating station, the No. 1 unit pressure regulating station, and the No. 2 unit pressure regulating station.

[0068] The natural gas in the gas supply main unit 45 first enters the component pressure regulating station. Specifically, at the component pressure regulating station, the natural gas flows sequentially through the component inlet unit 3, the component metering unit 4, the component cyclone separator unit 5, and the component fine filter unit 6. Then, the natural gas is divided into two paths: one path flows through the component dew point heating unit 7 and the component pressure regulating unit 9; the other path flows through the component booster compressor 8. These two paths are arranged in parallel (when the incoming natural gas pressure is high, it flows through the component dew point heating unit 7 and the component pressure regulating unit 9; when the incoming gas pressure is low, it flows through the booster compressor 8).

[0069] The natural gas in the gas supply main unit 45 then enters the pressure regulating stations of Unit 3 and Unit 4. Specifically, at the pressure regulating stations of Unit 3 and Unit 4, the natural gas flows sequentially through the inlet unit 13 of Units 3 and 4, the metering unit 14 of Units 3 and 4, the cyclone separator unit 15 of Units 3 and 4, and the fine filtration unit 16 of Units 3 and 4. Afterward, the natural gas is divided into four streams: one stream flows through the start-up boiler electric heater unit 26 and the start-up boiler pressure regulating unit 27; one stream flows through the booster compressor 20 of Unit 3; one stream flows through the booster compressor 24 of Unit 4; and one stream flows through the dew point heating unit 17 of Units 3 and 4. These four streams are arranged in parallel.

[0070] After passing through the dew point heating unit 17 of Units 3 and 4, the natural gas is divided into two streams: one stream flows through the pressure regulating unit 19 and the outlet unit 21 of Unit 3; the other stream flows through the pressure regulating unit 23 and the outlet unit 25 of Unit 4. The two streams are arranged in parallel.

[0071] Pump unit 18 of Unit 3 and pump unit 22 of Unit 4 are arranged on the return water pipes of dew point heating unit 17 of Units 3 and 4. The return water of the dew point heater is pressurized by pump unit 18 of Unit 3 and pump unit 22 of Unit 4 and then returned to the waste heat boiler.

[0072] The natural gas in the gas supply main unit 45 re-enters the pressure regulating stations of Unit 1 and Unit 2. Specifically, after flowing sequentially through the inlet units 28, metering units 29, cyclone separators 30, and fine filtration units 31 of Units 1 and 2, the natural gas is divided into two paths: one path flows through the dew point heating unit 32 of Units 1 and 2; the other path flows through the booster compressor 38 of Unit 2. These two paths are arranged in parallel.

[0073] After passing through the dew point heating unit 32 of Units 1 and 2, the natural gas is divided into two paths: one path flows through the pressure regulating unit 34 and outlet unit 35 of Unit 1; the other path flows through the pressure regulating unit 37 and outlet unit 39 of Unit 2. The two paths are arranged in parallel.

[0074] The pump unit 33 of Unit 1 and the pump unit 36 ​​of Unit 2 are arranged on the return water pipes of the dew point heating unit 32 of Unit 1 and Unit 2. The return water of the dew point heater is pressurized by the pump unit 33 of Unit 1 and the pump unit 36 ​​of Unit 2 and then returned to the waste heat boiler.

[0075] The natural gas venting pipelines of the component pressure regulating station, the No. 3 unit pressure regulating station, the No. 4 unit pressure regulating station, the No. 1 unit pressure regulating station, and the No. 2 unit pressure regulating station are centrally connected to the venting tower 10.

[0076] The aforementioned pressure regulating stations are equipped with canopies and are arranged in a semi-open-air manner.

[0077] The construction and commissioning sequence of a natural gas pressure regulating station for a gas turbine power plant provided in this embodiment is as follows: component platform pressure regulating station → pressure regulating stations for Unit 3 and Unit 4 → pressure regulating stations for Unit 1 and Unit 2. The component platform pressure regulating station, Unit 3 and Unit 4 pressure regulating stations, and Unit 1 and Unit 2 pressure regulating stations are arranged sequentially from west to east. The pressure regulating stations are compactly arranged, with reasonable functional zoning, and are adapted to the construction sequence. Specifically, the component platform inlet unit 3, the Unit 3 and Unit 4 inlet units 13, and the Unit 1 and Unit 2 inlet units 28 are all connected to the gas supply main pipe unit 45; the gas supply main pipe unit 45 is equipped with double-isolation ball valves between the component platform inlet unit 3 and the Unit 3 and Unit 4 inlet units 13, and between the Unit 3 and Unit 4 inlet units 13 and the Unit 1 and Unit 2 inlet units 28. After the construction of the component station pressure regulating station is completed, the double isolation ball valve between component station inlet unit 3 and inlet unit 13 of units 3 and 4 needs to be closed. After the expansion of the pressure regulating stations of units 3 and 4 is completed, the double isolation ball valve can be opened. Similarly, after the construction of the pressure regulating stations of units 3 and 4 is completed, the double isolation ball valve between inlet unit 13 of units 3 and 4 and inlet unit 28 of units 1 and 2 needs to be closed. After the expansion of the pressure regulating stations of units 1 and 2 is completed, the double isolation ball valve can be opened.

[0078] The auxiliary equipment room of the pressure regulating station is located on the west side of the main body of the pressure regulating station, and is kept at a safe distance from the main body of the pressure regulating station.

[0079] The auxiliary equipment rooms are arranged sequentially from north (third direction) to south (fourth direction): metering station instrument room 40, hot water boiler room 41, power distribution room 42, electronic equipment room 43, and nitrogen generator room 44. Hot water boiler room 41 contains pipe trenches and a sewage tank. Hot water boiler room 41 is located to the west of component platform dew point heating unit 7, and the two are parallel. Nitrogen generator room 44 contains the supporting equipment (nitrogen generator) for the natural gas booster. A pipeline connects the auxiliary equipment rooms of the pressure regulating station to the main body of the pressure regulating station. This pipeline serves as the hot water supply and return pipeline for the hot water boiler room. The hot water generated by the hot water boiler room is supplied to the component platform dew point heating unit, the dew point heating units of units three and four, and the dew point heating units of units one and two, serving as the heat source for heating the natural gas in the dew point heaters. The hot water return pipeline returns to the hot water boiler.

[0080] The auxiliary equipment room is a room with an interior layout.

[0081] The main body of the pressure regulating station is a major hazard source, and the auxiliary equipment room is located outside the explosion hazard zone of the main body of the pressure regulating station, and a safe distance is required between them.

[0082] A fence is erected around the main body and auxiliary equipment of the pressure regulating station.

[0083] A chromatograph is installed between the inlet unit 28 of Unit 1 and Unit 2 and the water pump unit 36 ​​of Unit 2. A chromatograph is also installed between the inlet unit 13 of Unit 3 and Unit 4 and the water pump unit 22 of Unit 4. The chromatograph is used to analyze the composition of the natural gas.

[0084] This embodiment provides a natural gas pressure regulating station for a gas turbine power plant, which has a compact layout, reasonable functional zoning, adapts to the construction sequence of pressure regulating stations, and facilitates unit expansion.

[0085] This embodiment provides a natural gas pressure regulating station for a gas turbine power plant. The natural gas booster is located on the south side of the pressure regulating station, and a maintenance road is set outside the south fence to facilitate the maintenance of the booster.

[0086] This embodiment provides a natural gas pressure regulating station for a gas turbine power plant. The nitrogen generator, an auxiliary equipment for the natural gas booster, is located in a safe area. The nitrogen generator can be a non-explosion-proof device, which reduces procurement costs and improves safety.

[0087] This embodiment provides a natural gas pressure regulating station for a gas turbine power plant, in which the hot water boiler room is located close to the dew point heater unit, which can shorten the length of the hot water pipeline between the hot water boiler room and the dew point heater unit and reduce pipeline resistance.

[0088] This embodiment provides a natural gas pressure regulating station for a gas turbine power plant, in which the auxiliary equipment rooms are centrally arranged, resulting in a compact layout that reduces the room footprint and facilitates inspection and maintenance.

[0089] Example 2

[0090] Embodiment 2 of the present invention provides a method for operating a natural gas pressure regulating station in a gas turbine power plant as described in Embodiment 1, comprising the following steps:

[0091] The upstream natural gas is supplied to three pressure regulating stations via the gas supply main pipeline unit 45, namely, the component pressure regulating station, the No. 3 unit pressure regulating station, the No. 4 unit pressure regulating station, the No. 1 unit pressure regulating station, and the No. 2 unit pressure regulating station.

[0092] The natural gas in the gas supply main unit 45 first enters the component pressure regulating station. Specifically, at the component pressure regulating station, the natural gas flows sequentially through the component inlet unit 3, the component metering unit 4, the component cyclone separator unit 5, and the component fine filter unit 6. Then, the natural gas is divided into two paths: one path flows through the component dew point heating unit 7 and the component pressure regulating unit 9; the other path flows through the component booster compressor 8. These two paths are arranged in parallel (when the incoming natural gas pressure is high, it flows through the component dew point heating unit 7 and the component pressure regulating unit 9; when the incoming gas pressure is low, it flows through the booster compressor 8).

[0093] The natural gas in the gas supply main unit 45 then enters the pressure regulating stations of Unit 3 and Unit 4. Specifically, at the pressure regulating stations of Unit 3 and Unit 4, the natural gas flows sequentially through the inlet unit 13 of Units 3 and 4, the metering unit 14 of Units 3 and 4, the cyclone separator unit 15 of Units 3 and 4, and the fine filtration unit 16 of Units 3 and 4. Afterward, the natural gas is divided into four streams: one stream flows through the start-up boiler electric heater unit 26 and the start-up boiler pressure regulating unit 27; one stream flows through the booster compressor 20 of Unit 3; one stream flows through the booster compressor 24 of Unit 4; and one stream flows through the dew point heating unit 17 of Units 3 and 4. These four streams are arranged in parallel.

[0094] After passing through the dew point heating unit 17 of Units 3 and 4, the natural gas is divided into two streams: one stream flows through the pressure regulating unit 19 and the outlet unit 21 of Unit 3; the other stream flows through the pressure regulating unit 23 and the outlet unit 25 of Unit 4. The two streams are arranged in parallel.

[0095] Pump unit 18 of Unit 3 and pump unit 22 of Unit 4 are arranged on the return water pipes of dew point heating unit 17 of Units 3 and 4. The return water of the dew point heater is pressurized by pump unit 18 of Unit 3 and pump unit 22 of Unit 4 and then returned to the waste heat boiler.

[0096] The natural gas in the gas supply main unit 45 re-enters the pressure regulating stations of Unit 1 and Unit 2. Specifically, after flowing sequentially through the inlet units 28, metering units 29, cyclone separators 30, and fine filtration units 31 of Units 1 and 2, the natural gas is divided into two paths: one path flows through the dew point heating unit 32 of Units 1 and 2; the other path flows through the booster compressor 38 of Unit 2. These two paths are arranged in parallel.

[0097] After passing through the dew point heating unit 32 of Units 1 and 2, the natural gas is divided into two paths: one path flows through the pressure regulating unit 34 and outlet unit 35 of Unit 1; the other path flows through the pressure regulating unit 37 and outlet unit 39 of Unit 2. The two paths are arranged in parallel.

[0098] The pump unit 33 of Unit 1 and the pump unit 36 ​​of Unit 2 are arranged on the return water pipes of the dew point heating unit 32 of Unit 1 and Unit 2. The return water of the dew point heater is pressurized by the pump unit 33 of Unit 1 and the pump unit 36 ​​of Unit 2 and then returned to the waste heat boiler.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A natural gas pressure regulating station for a gas turbine power plant, characterized in that, It includes a gas supply main pipeline unit, a component platform pressure regulating station, and several dual-unit pressure regulating stations arranged parallel to the component platform pressure regulating station; each dual-unit pressure regulating station includes a booster compressor, a dew point heating unit, two parallel water pump units, two parallel pressure regulating units, two parallel outlet units, and an inlet unit, a metering unit, a cyclone separator unit, and a fine filtration unit connected in sequence; the dual-unit pressure regulating station is arranged parallel to the gas supply main pipeline unit; A booster compressor is installed on one side of the component platform pressure regulating station. The fine filtration unit in the dual-unit pressure regulating station closest to the component platform pressure regulating station is also connected to the booster compressor on one side of the component platform pressure regulating station. The hot water boiler room is located on the west side of the component platform dew point heating unit, and the two are parallel. The inlet unit is connected to the gas supply main pipe unit, each outlet unit is connected to a pressure regulating unit, both pressure regulating units are connected to the dew point heating unit, the booster and the dew point heating unit are both connected to the fine filtration unit, and two water pump units are respectively arranged on the return water pipe of the dew point heating unit.

2. A natural gas pressure regulating station for a gas turbine power plant as described in claim 1, characterized in that, The dual-unit pressure regulating station closest to the component pressure regulating station also includes a start-up boiler electric heater unit and a start-up boiler pressure regulating unit connected in sequence, wherein the start-up boiler electric heater unit is connected to the fine filtration unit.

3. A natural gas pressure regulating station for a gas turbine power plant as described in claim 1, characterized in that, The component station pressure regulating station includes a component station inlet unit, a component station metering unit, a component station cyclone separator unit, and a component station fine filtration unit connected in sequence, as well as a component station dew point heating unit and a component station booster connected to the component station fine filtration unit, and a component station pressure regulating unit connected to the component station dew point heating unit.

4. A natural gas pressure regulating station for a gas turbine power plant as described in claim 1, characterized in that, It also includes the venting tower; The natural gas venting pipelines of the component pressure regulating station and the dual-unit pressure regulating station are centrally connected to the venting tower.

5. A natural gas pressure regulating station for a gas turbine power plant as described in claim 1, characterized in that, All dual-unit pressure regulating stations are located on the first side of the component platform pressure regulating station, while the second side of the component platform pressure regulating station houses the metering station instrument room, hot water boiler room, power distribution room, electronic equipment room, and nitrogen generator room.

6. A natural gas pressure regulating station for a gas turbine power plant as described in claim 1, characterized in that, The outlet unit is equipped with a pressure stabilizing tank to stabilize natural gas pressure fluctuations.

7. A natural gas pressure regulating station for a gas turbine power plant as described in claim 1, characterized in that, The inlet unit is equipped with a fire alarm shut-off valve to cut off the flow of natural gas into the pressure regulating station in the event of a fire.

8. A natural gas pressure regulating station for a gas turbine power plant as described in claim 1, characterized in that, The inlet unit, metering unit, and cyclone separator are located on a straight line, and the straight line where the inlet unit is located, the fine filtration unit, and the dew point heating unit are parallel to each other. Two parallel water pump units are located on the first side of the dew point heating unit. Each outlet unit and its connected pressure regulating unit are located on the same straight line and are positioned on the second side of the dew point heating unit; The booster is located on the second side of the fine filtration unit and is parallel to the straight line where the outlet unit is located.

9. A method for operating a natural gas pressure regulating station in a gas turbine power plant as described in any one of claims 1-8, characterized in that, include: The natural gas in the gas supply main unit flows sequentially through the inlet unit, metering unit, cyclone separator unit and fine filter unit, then flows through the booster compressor and the dew point heating unit. After passing through the three-dew-point heating unit, the flow splits into two paths, which flow through two pressure regulating units and then into two outlet units. The return water from the dew point heater is pressurized by two pump units and then returned to the waste heat boiler.

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