A gas mixing station device for a double-layer gas-steam combined cycle power station

Abstract

The present invention relates to the technical field of gas mixing stations for combined cycle power plants, and in particular to a gas mixing station device for a double-layer gas-steam combined cycle power plant; the device comprises a gas mixing device, an air intake device, a first connecting pipe and a second connecting pipe, wherein the gas mixing device is located above the air intake device, and the gas mixing device is connected to the air intake device through the first connecting pipe and the second connecting pipe; the air intake device comprises a natural gas intake assembly and a synthetic gas intake assembly, the natural gas intake assembly is connected to the gas mixing device through the first connecting pipe, and the synthetic gas intake assembly is connected to the gas mixing device through the second connecting pipe; the present invention arranges the spatial distance reasonably through a double-layer structure, saves space, reduces the occupied area, and reduces the land cost; reasonably arranges the air intake pipeline, realizes the effective mixing of natural gas and synthetic gas, can realize both single-fuel air intake and dual-fuel air intake, and improves the versatility of power generation equipment.

Description

Technical Field

[0001] The invention relates to the technical field of a gas mixing station for a combined cycle power plant, and in particular to a gas mixing station device for a double-layer gas-steam combined cycle power plant. Background Art

[0002] The gas-steam combined cycle is a combined cycle that uses gas as a high-temperature working fluid, steam as a low-temperature working fluid, and the exhaust of the gas turbine as a heating source for the steam turbine device cycle. The so-called gas-steam combined cycle is to recover a large amount of heat from the exhaust of the gas turbine through the waste heat boiler, and then use it for the work of the steam turbine, so as to achieve the cascade utilization of energy. The comprehensive thermal efficiency of the general combined cycle system can reach 50%-60%. With the further increase in power, the initial temperature of the gas turbine gas can reach up to about 1600℃, and the exhaust temperature can reach up to 600℃. The exhaust temperature of the gas turbine is very high, while the exhaust temperature of the gas turbine is just in the temperature range that can be used by the steam turbine. Usually, the intake temperature of the steam turbine is about 400-500℃. The combination of the two generator sets can greatly improve the efficiency of energy utilization, reduce heat loss, and be more environmentally friendly and clean.

[0003] At present, gas turbines generally use natural gas, synthetic gas, etc. for combustion and power generation. The use of single fuel natural gas for power generation is relatively costly, and the use of single fuel synthetic gas for power generation has safety hazards and high requirements for equipment. Therefore, on the whole, it is more appropriate to use natural gas and synthetic gas for power generation. However, before power generation, the air intake process equipment and mixing ratio of natural gas and synthetic gas have always been technical difficulties, restricting the development of the industry. In addition, the function of gas turbines is also single, either it can only generate electricity with a single fuel or with mixed fuels. For a wide range of application markets, single-function power generation equipment has poor versatility, and there is also a lack of equipment that can achieve both single-fuel power generation and dual-fuel power generation.

[0004] Therefore, there is an urgent need to provide a gas mixing station device for a double-layer gas-steam combined cycle power plant, which, compared with the existing technology, can realize both single-fuel power generation and dual-fuel power generation. Summary of the invention

[0005] The present invention solves the technical problems existing in the prior art and provides a gas mixing station device of a double-layer gas-steam combined cycle power station.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A gas mixing station device of a double-layer gas-steam combined cycle power plant, comprising a gas mixing device, an air intake device, a first connecting pipe and a second connecting pipe, wherein the gas mixing device is located above the air intake device, and the gas mixing device is connected to the air intake device through the first connecting pipe and the second connecting pipe;

[0008] The air intake device includes a natural gas intake component and a synthetic gas intake component, and the gas mixing device includes a natural gas flow control unit, a synthetic gas flow control unit, a gas mixing pipe, a gas mixing unit and a pressure regulating unit. The natural gas intake component is connected to the natural gas flow control unit through a first connecting pipe, and the synthetic gas intake component is connected to the synthetic gas flow control unit through a second connecting pipe. The natural gas flow control unit and the synthetic gas flow control unit are connected through the gas mixing pipe, and the output end of the gas mixing pipe is connected to the input end of the gas mixing unit, and the output end of the gas mixing unit is connected to the input end of the pressure regulating unit, and the pressure regulating unit outputs the fuel required by the gas turbine.

[0009] Further, the natural gas flow control unit includes an upper natural gas main pipe, an upper natural gas branch pipe, a first distribution pipe and a distribution branch pipe, the first distribution pipe is connected to the first connecting pipe, and the first distribution pipe is also connected to multiple upper natural gas main pipes, each of the upper natural gas main pipes is connected to an upper natural gas branch pipe at one end away from the first distribution pipe, the upper natural gas branch pipe is connected to the mixing pipe, and each of the upper natural gas branch pipes is serially connected with a first control valve, one end of the distribution branch pipe is connected to the first distribution pipe, and the other end of the distribution branch pipe is connected to the pressure regulating unit.

[0010] Furthermore, the synthesis gas flow control unit includes an upper synthesis gas main pipe and a second distribution pipe, the second distribution pipe is connected to the second connecting pipe, one end of the upper synthesis gas main pipe is connected to the second distribution pipe, and the other end of the upper synthesis gas main pipe is connected to the mixing pipe; each of the upper synthesis gas main pipes is connected in series with a second control valve.

[0011] Furthermore, the blending ratio of natural gas and synthesis gas is adjusted by controlling the opening of the first control valve and the second control valve, and the blending ratio of natural gas and synthesis gas is 0-1:1.

[0012] Furthermore, the gas mixing unit includes a plurality of static mixers, and the gas mixing pipes are also provided with a plurality of gas mixing pipes, and each of the static mixers is connected to one of the gas mixing pipes.

[0013] Furthermore, the pressure regulating unit comprises a plurality of pressure regulating pipes, each of which is connected to one of the static mixers, and each of which is connected in series to a shut-off valve and at least two self-operated regulating valves.

[0014] Furthermore, the pressure regulating range of the pressure regulating unit is 19.5-30.5 Bar.

[0015] Furthermore, the natural gas intake assembly includes a natural gas inlet unit, a natural gas filtering unit, a natural gas metering unit, a heating assembly, an instrument gas storage tank unit and a natural gas condensing unit. The natural gas inlet unit, the natural gas filtering unit, the natural gas metering unit and the heating assembly are connected in sequence along the flow direction of the natural gas, and the heating assembly is connected to the first connecting pipe; the instrument gas storage tank unit is connected to the natural gas inlet unit, a pneumatic regulating valve is provided in the natural gas inlet unit, the instrument gas storage tank unit is connected to the gas source of the pneumatic regulating valve, and the instrument gas storage tank unit adjusts the pressure of the natural gas entering the natural gas inlet unit by controlling the gas source of the pneumatic regulating valve; the natural gas condensing unit is connected to the natural gas filtering unit, and the natural gas condensing unit is used to collect condensate generated in the pipeline.

[0016] Furthermore, the heating assembly includes a first heating unit and a second heating unit which are arranged in parallel, the first heating unit uses a heat exchanger to heat the natural gas, and the second heating unit uses an electric heater to heat the natural gas.

[0017] Furthermore, the synthesis gas intake assembly includes a synthesis gas inlet unit, a synthesis gas filter unit, a synthesis gas metering unit and a synthesis gas condensing unit, and the synthesis gas inlet unit, the synthesis gas filter unit and the synthesis gas metering unit are arranged in sequence along the flow direction of the synthesis gas; the synthesis gas condensing unit is connected to the synthesis gas filter unit, and the synthesis gas condensing unit is used to collect condensate generated in the pipeline.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention arranges the spatial distance reasonably through the double-layer structure, saves space, reduces the floor area and lowers the land cost; reasonably arranges the air intake pipeline to achieve effective mixing of natural gas and synthesis gas, which can realize both single-fuel air intake and dual-fuel air intake, and improves the versatility of the power generation equipment; two kinds of natural gas heating devices are set to achieve heating complementarity. When electricity is insufficient, a diesel engine is used for generation, and the natural gas electric heater heating unit is connected for heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the air intake device of the present invention.

[0022] Figure 3 It is a schematic structural diagram of the gas mixing device of the present invention.

[0023] Figure 4 It is a partial schematic diagram of the air intake device of the present invention.

[0024] Figure 5 The air intake device of the present invention and Figure 4 A partial schematic diagram showing different parts.

[0025] Figure 6 It is a partial schematic diagram of the gas mixing device of the present invention.

[0026] Figure 7 The gas mixing device of the present invention and Figure 6 A partial schematic diagram showing different parts.

[0027] Description of reference numerals:

[0028] 1. Gas mixing equipment; 11. Pressure regulating unit; 12. Gas mixing unit; 13. Natural gas flow control unit; 131. Upper natural gas main pipe; 132. Upper natural gas branch pipe; 133. First distribution pipe; 134. Distribution branch pipe; 14. Syngas flow control unit; 141. Upper syngas main pipe; 142. Second distribution pipe; 15. Gas mixing pipe; 2. Gas intake equipment; 21. Natural gas inlet unit; 201. Lower natural gas main pipe; 202. Lower natural gas branch pipe; 22. Instrument Gas storage tank unit; 23, natural gas filter unit; 231, first filter tank; 24, natural gas metering unit; 25, first heating unit; 26, second heating unit; 27, natural gas condensing unit; 28, synthesis gas inlet unit; 281, lower synthesis gas main pipe; 282, lower synthesis gas branch pipe; 29, synthesis gas filter unit; 291, second filter tank; 210, synthesis gas metering unit; 211, synthesis gas condensing unit; 3, first connecting pipe; 4, second connecting pipe. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention. It should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] like Figure 1 , Figure 2 , Figure 3As shown, the present invention provides a gas mixing station device for a double-layer gas-steam combined cycle power plant, comprising a gas mixing device 1, an air intake device 2, a first connecting pipe 3 and a second connecting pipe 4. The gas mixing device 1 is arranged above the air intake device 2, and the gas mixing device 1 is connected to the air intake device 2 through the first connecting pipe 3 and the second connecting pipe 4; the air intake device 2 comprises a natural gas intake assembly and a synthetic gas intake assembly, the natural gas intake assembly is connected to the gas mixing device 1 through the first connecting pipe 3, and the synthetic gas intake assembly is connected to the gas mixing device 1 through the second connecting pipe 4. An inspection space is provided between the gas mixing device 1 and the air intake device 2, and the inspection space is 7-12 meters. The overall length of the gas mixing station device is 35-50 meters and the width is 10-18 meters.

[0031] like Figure 2 , Figure 4 , Figure 5 As shown, the natural gas intake assembly includes a natural gas inlet unit 21, a natural gas filter unit 23, a natural gas metering unit 24 and a heating assembly. One side of the natural gas inlet unit 21 is connected to the natural gas filter unit 23, the end of the natural gas filter unit 23 away from the natural gas inlet unit 21 is connected to the natural gas metering unit 24, the side of the natural gas metering unit 24 away from the natural gas filter unit 23 is connected to the heating assembly, and the side of the heating assembly away from the natural gas metering unit 24 is connected to the gas mixing device 1 through the first connecting pipe 3.

[0032] Specifically, the natural gas inlet unit 21 includes a lower natural gas main pipe 201 and a lower natural gas branch pipe 202. The lower natural gas main pipe 201 branches into two lower natural gas branch pipes 202 at the end. The two lower natural gas branch pipes 202 are both connected to the natural gas filtering unit 23. The natural gas filtering unit 23 includes two first filter tanks 231. Each lower natural gas branch pipe 202 is connected to a first filter tank 231. The output ends of the two first filter tanks 231 are merged into one and connected to the natural gas metering unit 24. The natural gas metering unit 24 is an ultrasonic flow meter, and the natural gas metering unit 24 is used to measure the consumption of natural gas. The heating component includes a first heating unit 25 and a second heating unit 26. The first heating unit 25 and the second heating unit 26 are arranged in parallel. The first heating unit 25 is a heat exchanger, and the second heating unit 26 is an electric heater.

[0033] The natural gas intake assembly also includes an instrument gas storage tank unit 22 and a natural gas condensation unit 27; the instrument gas storage tank unit 22 is connected to the natural gas inlet unit 21, and a pneumatic regulating valve is provided on the lower natural gas main pipe 201. The instrument gas storage tank unit 22 is used in conjunction with the pneumatic regulating valve. The instrument gas storage tank unit 22 adjusts the pressure of the natural gas entering the lower natural gas main pipe 201 by adjusting the gas source of the pneumatic regulating valve, thereby achieving the purpose of stabilizing the pressure of the natural gas entering the lower natural gas main pipe 201, so that the pressure of the natural gas entering the lower natural gas main pipe 201 meets the working pressure requirement of the pipeline; the natural gas condensation unit 27 is connected to the bottom of the first filter tank 231, and is used to collect the condensate generated in the pipeline and discharge the condensate in the pipeline in time. The natural gas condensation unit 27 is a condenser.

[0034] After the natural gas flows in through the lower natural gas main pipe 201, it is divided into two paths and enters the two lower natural gas branch pipes 202 respectively, and then flows into the first filter tank 231 through the lower natural gas branch pipe 202 for filtration. The natural gas flowing out of the two first filter tanks 231 is combined into one path and enters the natural gas metering unit 24 to measure the flow rate of the natural gas, and then enters the heating component for heating. The heating component heats the natural gas to above 5°C to meet the requirements of the intake temperature of the gas turbine. The heated natural gas flows into the mixing device 1 through the first connecting pipe 3; under normal circumstances, the first heating unit 25 is used to heat the natural gas, and the second heating unit 26 is selected for heating in the early debugging and emergency stages. The second heating component is a backup measure.

[0035] The synthesis gas intake assembly includes a synthesis gas inlet unit 28, a synthesis gas filter unit 29 and a synthesis gas metering unit 210. One side of the synthesis gas inlet unit 28 is connected to the synthesis gas filter unit 29, and the end of the synthesis gas filter unit 29 away from the synthesis gas inlet unit 28 is connected to the synthesis gas metering unit 210. The end of the synthesis gas metering unit 210 away from the synthesis gas filter unit 29 is connected to the mixing device 1 through the second connecting pipe 4; the synthesis gas metering unit 210 is an ultrasonic flow meter, and the synthesis gas metering unit 210 is used to measure the consumption of synthesis gas.

[0036] Specifically, the synthesis gas inlet unit 28 includes a lower synthesis gas main pipe 281 and a lower synthesis gas branch pipe 282. The lower synthesis gas main pipe 281 is divided into two paths at the end, namely two lower synthesis gas branch pipes 282; the synthesis gas filtration unit 29 includes two second filter tanks 291, each lower synthesis gas branch pipe 282 is connected to a second filter tank 291, and the output ends of the two second filter tanks 291 are merged into one path and connected to the synthesis gas metering unit 210. The synthesis gas metering unit 210 uses a gas flow meter to detect the synthesis gas flow rate.

[0037] The synthesis gas intake assembly also includes a synthesis gas condensation unit 211, which is connected to the bottom of the second filter tank 291. The synthesis gas condensation unit 211 is used to collect condensate generated in the pipeline and drain the condensate in the pipeline in time. The synthesis gas condensation unit 211 is a condenser.

[0038] After the synthesis gas flows in through the lower synthesis gas main pipe 281, it is divided into two paths and enters the two lower synthesis gas branch pipes 282 respectively, and then flows into the second filter tank 291 through the lower synthesis gas branch pipe 282 for filtration. The natural gas filtered in the two second filter tanks 291 is merged into one path and flows into the synthesis gas metering unit 210 to measure the flow rate of the synthesis gas, and then enters the second connecting pipe 4 and flows into the gas mixing equipment 1.

[0039] like Figure 3 , Figure 6 , Figure 7 As shown, the gas mixing device 1 includes a natural gas flow control unit 13, a synthesis gas flow control unit 14, a gas mixing pipe 15, a gas mixing unit 12 and a pressure regulating unit 11. The input end of the natural gas flow control unit 13 is connected to the first connecting pipe 3, the input end of the synthesis gas flow control unit 14 is connected to the second connecting pipe 4, the output end of the natural gas flow control unit 13 is connected to the output end of the synthesis gas flow control unit 14 through the gas mixing pipe 15, the gas mixing pipe 15 is connected to the input end of the gas mixing unit 12, the output end of the gas mixing unit 12 is connected to the pressure regulating unit 11, and the output end of the pressure regulating unit 11 is connected to the fuel input end of the gas turbine.

[0040] The natural gas flow control unit 13 includes an upper natural gas main pipe 131, an upper natural gas branch pipe 132, a first distribution pipe 133 and a distribution branch pipe 134. The first distribution pipe 133 is connected to the first connecting pipe 3. The first distribution pipe 133 is also connected to multiple upper natural gas main pipes 131. Preferably, 6 upper natural gas main pipes 131 are arranged. The ends of two adjacent natural gas main pipes away from the first distribution pipe 133 are merged into one and then connected to the upper natural gas branch pipe 132. The 6 upper natural gas main pipes 131 are connected to 3 upper natural gas branch pipes 132; the first distribution pipe 133 is also connected to the distribution branch pipe 134. The end of the distribution branch pipe 134 away from the first distribution pipe 133 is connected to the pressure regulating unit 11; each upper natural gas branch pipe 132 is connected in series with a first control valve.

[0041] The synthesis gas flow control unit 14 includes an upper synthesis gas main pipe 141 and a second distribution pipe 142. The second distribution pipe 142 is connected to the second connecting pipe 4. The second distribution pipe 142 is also connected to multiple upper synthesis gas main pipes 141. Each upper synthesis gas main pipe 141 is connected in series with a second control valve. There are three upper synthesis gas main pipes 141. The three upper synthesis gas main pipes 141 are correspondingly arranged with the three upper natural gas branch pipes 132. The corresponding synthesis gas main pipes are connected to the upper natural gas branch pipes 132 through the mixing pipe 15, that is, there are three mixing pipes 15, and the output ends of the three mixing pipes 15 are all connected to the mixing unit 12.

[0042] The blending ratio of natural gas and synthesis gas is adjusted by adjusting the opening of the first control valve and the second control valve provided on the corresponding upper natural gas branch pipe 132 and the upper synthesis gas main pipe 141. The blending ratio of natural gas and synthesis gas is preferably set to 0-1:1.

[0043] The gas mixing unit 12 includes multiple static mixers, preferably three static mixers, each of which is connected to the output end of a gas mixing pipe 15; the pressure regulating unit 11 includes multiple pressure regulating pipes, each of which is connected in series with an inlet shut-off valve and at least two self-operated pressure regulating valves, the self-operated pressure regulating valves include at least one self-operated working pressure regulating valve and one self-operated monitoring pressure regulating valve, and the pressure regulation range of the pressure regulating unit 11 is 19.5-30.5Bar.

[0044] The present invention arranges the spatial distance reasonably through the double-layer steel structure, saves space, reduces the floor area and reduces the land cost; reasonably arranges the air intake pipeline to achieve the effective mixing of natural gas and synthesis gas, which can realize both single-fuel air intake and dual-fuel air intake, and improves the versatility of the power generation equipment; arranges two kinds of natural gas heating devices to achieve heating complementarity, and uses a diesel engine to generate electricity when electricity is insufficient, and connects to the natural gas electric heater heating unit for heating; adopts the fuel preheating method to improve the efficiency of the gas engine, reduce the ice blockage caused by the pipeline in winter, and reduce the impact on the safe and stable operation of the unit and the stress of the pipeline.

[0045] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A gas mixing station device for a double-layer gas-steam combined cycle power plant, characterized in that: It comprises an air mixing device, an air intake device, a first connecting pipe and a second connecting pipe, wherein the air mixing device is located above the air intake device, and the air mixing device is connected with the air intake device through the first connecting pipe and the second connecting pipe; The air intake device comprises a natural gas intake component and a synthetic gas intake component, and the gas mixing device comprises a natural gas flow control unit, a synthetic gas flow control unit, a gas mixing pipe, a gas mixing unit and a pressure regulating unit. The natural gas intake component is connected to the natural gas flow control unit through a first connecting pipe, and the synthetic gas intake component is connected to the synthetic gas flow control unit through a second connecting pipe. The natural gas flow control unit and the synthetic gas flow control unit are connected through the gas mixing pipe, and the output end of the gas mixing pipe is connected to the input end of the gas mixing unit, and the output end of the gas mixing unit is connected to the input end of the pressure regulating unit, and the pressure regulating unit outputs the fuel required by the gas turbine; The natural gas flow control unit includes an upper natural gas main pipe, an upper natural gas branch pipe, a first distribution pipe and a distribution branch pipe. The first distribution pipe is connected to the first connecting pipe. The first distribution pipe is also connected to multiple upper natural gas main pipes. One end of each upper natural gas main pipe away from the first distribution pipe is connected to an upper natural gas branch pipe. The upper natural gas branch pipe is connected to the gas mixing pipe. A first control valve is connected in series to each upper natural gas branch pipe. One end of the distribution branch pipe is connected to the first distribution pipe, and the other end of the distribution branch pipe is connected to the pressure regulating unit.

2. A gas mixing station device for a double-layer gas-steam combined cycle power plant according to claim 1, characterized in that: The synthesis gas flow control unit includes an upper synthesis gas main pipe and a second distribution pipe, the second distribution pipe is connected to the second connecting pipe, one end of the upper synthesis gas main pipe is connected to the second distribution pipe, and the other end of the upper synthesis gas main pipe is connected to the mixing pipe; each of the upper synthesis gas main pipes is connected in series with a second control valve.

3. A gas mixing station device for a double-layer gas-steam combined cycle power plant according to claim 2, characterized in that: The blending ratio of natural gas and synthesis gas is adjusted by controlling the opening of the first control valve and the second control valve. The blending ratio of natural gas and synthesis gas is 0-1:

1.

4. A gas mixing station device for a double-layer gas-steam combined cycle power plant according to claim 1, characterized in that: The gas mixing unit includes a plurality of static mixers, and a plurality of gas mixing pipes are also provided, and each of the static mixers is connected to one of the gas mixing pipes.

5. A gas mixing station device for a double-layer gas-steam combined cycle power plant according to claim 4, characterized in that: The pressure regulating unit comprises a plurality of pressure regulating pipes, each of which is connected to one of the static mixers, and each of which is connected in series to a shut-off valve and at least two self-operated regulating valves.

6. A gas mixing station device for a double-layer gas-steam combined cycle power plant according to claim 5, characterized in that: The pressure regulating range of the pressure regulating unit is 19.5-30.5 Bar.

7. A gas mixing station device for a double-layer gas-steam combined cycle power plant according to claim 1, characterized in that: The natural gas intake assembly includes a natural gas inlet unit, a natural gas filter unit, a natural gas metering unit, a heating assembly, an instrument gas storage tank unit and a natural gas condensing unit. The natural gas inlet unit, the natural gas filter unit, the natural gas metering unit and the heating assembly are connected in sequence along the flow direction of the natural gas, and the heating assembly is connected to the first connecting pipe; the instrument gas storage tank unit is connected to the natural gas inlet unit, a pneumatic regulating valve is provided in the natural gas inlet unit, the instrument gas storage tank unit is connected to the gas source of the pneumatic regulating valve, and the instrument gas storage tank unit adjusts the pressure of the natural gas entering the natural gas inlet unit by controlling the gas source of the pneumatic regulating valve; the natural gas condensing unit is connected to the natural gas filter unit, and the natural gas condensing unit is used to collect condensate generated in the pipeline.

8. A gas mixing station device for a double-layer gas-steam combined cycle power plant according to claim 7, characterized in that: The heating assembly includes a first heating unit and a second heating unit which are arranged in parallel. The first heating unit heats the natural gas by using a heat exchanger, and the second heating unit heats the natural gas by using an electric heater.

9. The gas mixing station device of a double-layer gas-steam combined cycle power plant according to claim 1, characterized in that: The synthesis gas intake assembly includes a synthesis gas inlet unit, a synthesis gas filter unit, a synthesis gas metering unit and a synthesis gas condensing unit. The synthesis gas inlet unit, the synthesis gas filter unit and the synthesis gas metering unit are arranged in sequence along the flow direction of the synthesis gas; the synthesis gas condensing unit is connected to the synthesis gas filter unit, and the synthesis gas condensing unit is used to collect condensate generated in the pipeline.

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