Gas supply system of gas turbine
By introducing pressure buffer tank and flow control valve components into the gas turbine gas supply system, the problem of pressure fluctuations in the gas supply system is solved, the stability and safety of the system are achieved, and the normal operation of the gas turbine is ensured.
Patent Information
- Application Number
- CN202420608193.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-03-27
AI Technical Summary
The gas supply pressure of the gas turbine is easily affected by the pressure fluctuations of the natural gas pipeline network, resulting in unstable gas supply system and affecting the normal operation of the unit.
A gas turbine gas supply system is designed, including a storage tank, a pressure buffer tank, a heat exchanger and a flow control valve assembly. The stability of the gas supply system is ensured by setting up a pressure buffer tank in the pipeline and equipped with a pressure regulating valve assembly and a flow control valve assembly.
It effectively stabilizes the pressure of the gas turbine gas supply system, ensures that the normal operation needs of the gas turbine can be met when the pressure of natural gas fluctuates greatly, and improves the safety, reliability and flexibility of the gas supply system.
Smart Images
Figure CN222478809U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas supply systems, in particular to a gas turbine gas supply system. Background Art
[0002] The gas turbine gas supply pressure is often affected by the pressure fluctuations of the gas pipeline network. Therefore, designing a safe and reliable gas turbine gas supply system is crucial to the safe and stable operation of the unit. Once a problem occurs in the gas supply system, it will directly affect the normal operation of the unit, causing huge economic losses to the enterprise and also bring huge pressure to the safe and stable operation of the power grid. Utility Model Content
[0003] The utility model aims to provide a gas turbine air supply system which can solve the above technical problems.
[0004] The utility model provides a gas turbine air supply system, comprising a storage tank and a pressure buffer tank, wherein the outlet end of the storage tank is connected to a heat exchanger via a heat exchanger inlet pipe, the heat exchanger is connected to the pressure buffer tank via a pressure buffer tank inlet pipe, the outlet end of the pressure buffer tank is connected to a gas turbine via an air intake pipe, a pressure regulating valve assembly is provided on the heat exchanger inlet pipe, and a flow control valve assembly is provided on the air intake pipe.
[0005] Furthermore, the pressure regulating valve assembly includes a pressure regulating valve body, a pressure regulating valve signal receiver, a pressure sensor and a pressure controller, the pressure sensor is used to monitor the internal pressure of the pressure buffer tank, and the pressure controller is electrically connected to the pressure sensor and the pressure regulating valve signal receiver respectively.
[0006] Furthermore, the flow control valve assembly includes a flow control valve body, a flow control valve signal receiver, a flow sensor and a flow controller, the flow sensor is used to monitor the gas flow in the intake pipe, and the flow controller is electrically connected to the flow sensor and the flow control valve signal receiver respectively.
[0007] Furthermore, a main shut-off valve is provided between the pressure regulating valve body and the storage tank.
[0008] Furthermore, the heat exchanger includes a first heat exchanger and a second heat exchanger, and the heat exchange medium of the heat exchanger is air. The outlet end of the storage tank is respectively connected to the first heat exchanger and the second heat exchanger through a heat exchanger inlet pipe, the outlet end of the first heat exchanger and the outlet end of the second heat exchanger are connected to the pressure buffer tank together, the medium outlet of the first heat exchanger is connected to the air inlet of the gas turbine through an air delivery pipe, and the medium outlet of the second heat exchanger is connected to the atmospheric environment, and the air inlet ends of the first heat exchanger and the second heat exchanger are respectively provided with a first regulating valve and a second regulating valve.
[0009] Furthermore, an air filter is provided on the air delivery pipeline.
[0010] Furthermore, the air delivery duct is provided with temperature and humidity sensors.
[0011] Furthermore, the first heat exchanger and the second heat exchanger are both finned heat exchangers.
[0012] Furthermore, it also includes a secondary pressure regulating valve assembly, which serves as a backup for the pressure regulating valve assembly.
[0013] Furthermore, it also includes an auxiliary flow control valve assembly, which serves as a backup for the flow control valve assembly.
[0014] Beneficial effects:
[0015] The utility model sets a pressure buffer tank in the pipeline, monitors and adjusts the internal pressure of the pressure buffer tank through the pressure regulating valve assembly, so that the pressure of the whole system is kept stable. At the same time, the flow control valve assembly can adjust the gas flow entering the gas turbine, and can meet the normal operation requirements of the gas turbine when the pressure of the incoming natural gas fluctuates greatly. In addition, the gas supply system has a simplified structure, which is conducive to easy adjustment and stable combustion when the gas turbine load changes. It also has the advantages of flexible operation adjustment mode and safe and reliable gas supply. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0018] Explanation of the reference numerals: 1-storage tank, 2-pressure buffer tank, 3-heat exchanger inlet pipe, 401-first heat exchanger, 402-second heat exchanger, 5-pressure buffer tank inlet pipe, 6-air intake pipe, 7-gas turbine, 801-pressure regulating valve body, 802-pressure sensor, 803-pressure controller, 901-flow control valve body, 902-flow sensor, 903-flow controller, 10-air delivery pipe, 1101-first regulating valve, 1102-second regulating valve, 12-air filter, 13-temperature and humidity sensor, 14-main shut-off valve. DETAILED DESCRIPTION
[0019] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0022] Example 1
[0023] A gas turbine air supply system, such as Figure 1As shown, it includes a storage tank 1 and a pressure buffer tank 2. The storage tank 1 is used to store LNG. The outlet end of the storage tank 1 is connected to a heat exchanger through a heat exchanger inlet pipe 3. The heat exchanger inlet pipe 3 is provided with a main shut-off valve 14. The heat exchanger includes a first heat exchanger 401 and a second heat exchanger 402. The heat exchange medium of the heat exchanger is air. The outlet end of the storage tank 1 is connected to the first heat exchanger 401 and the second heat exchanger 402 through the heat exchanger inlet pipe 3. The first heat exchanger 401 and the second heat exchanger 402 both adopt finned heat exchangers. The outlet of the first heat exchanger 401 and the outlet of the second heat exchanger 402 are connected to the pressure buffer tank 2. The medium outlet of the first heat exchanger 401 is connected to the air inlet of the gas turbine 7 through the air delivery pipeline 10. The air delivery pipeline 10 is provided with an air filter 12 and a temperature and humidity sensor 13. The medium outlet of the second heat exchanger 402 is connected to the atmosphere. The first and second heat exchangers 401 and 402 are provided with a first regulating valve 1101 and a second regulating valve 1102 at the air inlet end, respectively. The outlet of the pressure buffer tank 2 is connected to the gas turbine 7 through the air inlet pipeline 6. The heat exchanger inlet pipeline 3 is provided with a pressure regulating valve assembly, and the air inlet pipeline 6 is provided with a flow control valve assembly.
[0024] The pressure regulating valve assembly includes a pressure regulating valve body 801, a pressure sensor 802 and a pressure controller 803. The pressure regulating valve body 801 is provided with a pressure regulating valve signal receiver. The pressure sensor 802 is used to monitor the internal pressure of the pressure buffer tank 2. The pressure controller 803 is electrically connected to the pressure sensor 802 and the pressure regulating valve signal receiver respectively.
[0025] The flow control valve assembly includes a flow control valve body 901, a flow sensor 902 and a flow controller 903. A flow control valve signal receiver is provided on the flow control valve body 901. The flow sensor 902 is used to monitor the gas flow in the intake pipe 6. The flow controller 903 is electrically connected to the flow sensor 902 and the flow control valve signal receiver respectively.
[0026] Example 2
[0027] The structure is basically the same as that of Example 1, except that a set of pressure regulating valve assembly and flow control valve assembly is added, which serve as backup for the original pressure regulating valve assembly and flow control valve assembly and are designed to be redundant with each other.
[0028] Working and use process: The utility model is used to discharge and vaporize liquefied natural gas from an LNG storage tank, and finally supply it to a gas turbine 7 at a suitable pressure and flow rate. LNG (liquefied natural gas) is a cryogenic liquid, and its temperature is generally below -162°C. Before entering the gas turbine 7 for combustion and work, it needs to absorb heat in the air and vaporize into a gas state at room temperature. First, after being discharged from the storage tank 1, it enters the first heat exchanger 401 and the second heat exchanger 402 respectively. The liquefied natural gas in the first heat exchanger 401 and the second heat exchanger 402 exchanges heat with the air, and becomes gaseous natural gas and enters the pressure buffer tank 2, and then passes through the air intake pipe in the pressure buffer tank 2. 6 enters the gas turbine 7 for combustion and work, and the air heat exchange medium in the first heat exchanger 401 becomes cold air after heat exchange. The cold air passes through the air filter 12 and enters the air inlet of the gas turbine 7 to participate in combustion. The purpose of this is that the output of the gas turbine will decrease as the temperature of its inlet air increases. When the external ambient temperature is high (such as in hot summer), the gas turbine cannot operate at full load due to the high ambient temperature. By adjusting the opening of the first regulating valve 1101, the LNG flow entering the first heat exchanger 401 is controlled, and the cooled air heat exchange medium enters the gas turbine 7, thereby achieving the purpose of controlling the inlet air temperature of the gas turbine. For example, in a cold winter, the first regulating valve 1101 can be completely closed and only the second regulating valve 1102 can be opened to allow LNG to directly enter the second heat exchanger for heat exchange, and then the cold air heat exchange medium coming out of the second heat exchanger 402 is discharged into the atmosphere. Note that the first heat exchanger continues to work at this time, and the air heat exchange medium (without heat exchange) directly passes through the air filter 12 into the gas turbine 7.
[0029] The pressure buffer tank 2 is used to buffer the fluctuation of natural gas. The pressure buffer tank 2 is provided with a pressure sensor 802. The pressure sensor 802 obtains the real-time pressure in the pressure buffer tank 2 and transmits it to the pressure controller 803. The pressure controller 803 outputs a signal to the pressure regulating valve signal receiver, controls the opening of the pressure regulating valve body 801 to adjust the pressure of the pressure buffer tank 2. When the pressure is too high, the opening of the pressure regulating valve body 801 is reduced. When the pressure is too low, the opening of the pressure regulating valve body 801 is increased. A flow control valve assembly is provided on the air intake pipeline 6. The flow sensor 902 obtains the real-time flow and transmits it to the flow controller 903. The flow controller 903 outputs a signal to the flow control valve signal receiver, controls the opening of the flow control valve body 901 to adjust the gas supply flow. When the gas consumption of the gas turbine 7 increases, the opening of the flow control valve body 901 is increased. When the gas consumption of the gas turbine 7 decreases, the opening of the flow control valve body 901 is reduced.
[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A gas turbine air supply system, characterized in that: The invention comprises a storage tank and a pressure buffer tank, wherein the outlet end of the storage tank is connected to the heat exchanger through the heat exchanger inlet pipe, the heat exchanger is connected to the pressure buffer tank through the pressure buffer tank inlet pipe, the outlet end of the pressure buffer tank is connected to the gas turbine through the air intake pipe, the heat exchanger inlet pipe is provided with a pressure regulating valve assembly, the air intake pipe is provided with a flow control valve assembly, the pressure regulating valve assembly comprises a pressure regulating valve body, a pressure regulating valve signal receiver, a pressure sensor and a pressure controller, the pressure sensor is used to monitor the internal pressure of the pressure buffer tank, the pressure controller is electrically connected to the pressure sensor and the pressure regulating valve signal receiver respectively, the flow control valve assembly comprises a flow control valve body, a flow control valve signal receiver, a flow A sensor and a flow controller, wherein the flow sensor is used to monitor the gas flow in the intake pipe, and the flow controller is electrically connected to the flow sensor and the flow control valve signal receiver respectively. The heat exchanger includes a first heat exchanger and a second heat exchanger, and the heat exchange medium of the heat exchanger is air. The outlet end of the storage tank is respectively connected to the first heat exchanger and the second heat exchanger through the heat exchanger inlet pipe, and the outlet end of the first heat exchanger and the outlet end of the second heat exchanger are connected to the pressure buffer tank together. The medium outlet of the first heat exchanger is connected to the air inlet of the gas turbine through an air delivery pipe, and the medium outlet of the second heat exchanger is connected to the atmospheric environment. The air inlet ends of the first heat exchanger and the second heat exchanger are respectively provided with a first regulating valve and a second regulating valve.
2. The gas turbine air supply system according to claim 1, characterized in that: A main shut-off valve is provided between the pressure regulating valve body and the storage tank.
3. The gas turbine air supply system according to claim 1, characterized in that: An air filter is arranged on the air delivery pipeline.
4. The gas turbine air supply system according to claim 3, characterized in that: The air delivery pipeline is provided with temperature and humidity sensors.
5. The gas turbine air supply system according to claim 4, characterized in that: The first heat exchanger and the second heat exchanger are both finned heat exchangers.
6. The gas turbine air supply system according to claim 1, characterized in that: It also includes a secondary pressure regulating valve assembly, which serves as a backup for the pressure regulating valve assembly.
7. The gas turbine air supply system according to claim 1, characterized in that: It also includes an auxiliary flow control valve assembly, which serves as a backup for the flow control valve assembly.