Heat exchange system, control method, and gas turbine generator set

Abstract

The present application relates to the technical field of gas turbines, and to a heat exchange system, a control method, and a gas turbine generator set. The heat exchange system comprises a first heat exchanger arranged in a fuel line of a gas turbine, and a second heat exchanger arranged at an air inlet end. Upon exchanging heat with a heat transfer medium in the first heat exchanger, fuel of the gas turbine then enters the gas turbine through the fuel line. Upon exchanging heat with the heat transfer medium in the second heat exchanger, intake air at the air inlet end then enters the gas turbine. The heat transfer medium circulates between the first heat exchanger and the second heat exchanger.

Description

Heat exchange system, control method and gas turbine generator set

[0001] Related applications

[0002] This application claims priority to Chinese patent application filed on March 10, 2025, with application number 202510276364.0, entitled "Heat Exchange System, Control Method and Gas Turbine Generator Set", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of gas turbine technology, and in particular to a heat exchange system, control method, and gas turbine generator set. Background Technology

[0004] The performance of a gas turbine generator set is closely related to its ambient temperature. When the ambient temperature rises, the air density is lower, and the amount of air drawn into the gas turbine generator set decreases, resulting in a decrease in the output of the gas turbine generator set. In order to improve the output of the gas turbine generator set, the conventional method usually adopts the method of equipping the intake air cooling device or spraying to cool the intake air. However, the inventors realized that the conventional method has the problem of high cost. Summary of the Invention

[0005] According to various embodiments of this application, a heat exchange system, a control method, and a gas turbine generator set are provided.

[0006] A heat exchange system is applied to a gas turbine generator set, the gas turbine generator set including a gas turbine, the gas turbine being provided with an inlet end and an exhaust end; the heat exchange system includes:

[0007] The first heat exchanger is installed in the fuel line of the gas turbine. After the fuel of the gas turbine exchanges heat with the heat transfer medium in the first heat exchanger, it enters the gas turbine through the fuel line.

[0008] The second heat exchanger is located at the inlet end. The inlet gas at the inlet end exchanges heat with the heat transfer medium in the second heat exchanger before entering the gas turbine. The heat transfer medium inlet of the second heat exchanger is connected to the heat transfer medium outlet of the first heat exchanger, and the heat transfer medium outlet of the second heat exchanger is connected to the heat transfer medium inlet of the first heat exchanger.

[0009] A control method, applied to the aforementioned heat exchange system, includes:

[0010] Obtain the control command corresponding to the current operating mode; where the current operating mode is related to the ambient temperature of the heat exchange system.

[0011] The flow path of the heat transfer medium in the heat exchange system is controlled according to the control command.

[0012] A control device, applied to the aforementioned heat exchange system, the device comprising:

[0013] The acquisition module is used to acquire the control commands corresponding to the current operating mode; wherein, the current operating mode is related to the ambient temperature of the heat exchange system.

[0014] The flow path control module is used to control the flow path of the heat transfer medium in the heat exchange system according to control commands.

[0015] A gas turbine generator set includes a gas turbine, which has an intake end and an exhaust end.

[0016] The gas turbine generator set also includes the heat exchange system described above.

[0017] A computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0018] Obtain the control command corresponding to the current operating mode; where the current operating mode is related to the ambient temperature of the heat exchange system.

[0019] The flow path of the heat transfer medium in the heat exchange system is controlled according to the control command.

[0020] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features, objects, and advantages of this application will become apparent from the specification, drawings, and claims. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below may be some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 is a schematic diagram of the heat exchange system in one embodiment;

[0023] Figure 2 is a schematic diagram of the heat exchange system in another embodiment;

[0024] Figure 3 is a connection diagram of the heat exchange system in one embodiment;

[0025] Figure 4 is a connection diagram of the heat exchange system in another embodiment;

[0026] Figure 5 is a flowchart illustrating the control method in one embodiment;

[0027] Figure 6 is a structural block diagram of the control device in one embodiment;

[0028] Figure 7 is an internal structure diagram of a computer device in one embodiment. Detailed Implementation

[0029] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0030] Unless otherwise defined, 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 application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0031] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0032] Spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, when the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0033] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. Furthermore, in the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., when there is transmission of electrical signals or data between the connected objects.

[0034] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0035] As the global greenhouse effect intensifies and countries around the world reach a greater consensus on "carbon peaking" and "carbon neutrality," various industries are moving towards green development. For the oil industry, fracturing is an extremely energy-intensive operation. Conventional fracturing often relies on diesel engines to drive plunger pumps, which results in severe pollution, high noise, low power density, and large well site footprint, seriously restricting the development of the fracturing industry. With technological advancements, based on the characteristics of electric fracturing operations, fracturing is moving towards electric drive.

[0036] In practical applications of electric fracturing operations, the fracturing process requires a large amount of electricity. However, relying on the power grid for power supply presents certain limitations because well sites are often located in remote areas with limited power availability. Many rely on mobile generator sets that are easy to move. Traditional reciprocating generator sets have limited power density and require a larger well site area compared to gas turbine generator sets. For well sites with limited land, generator sets with smaller footprints and higher power density are more beneficial for fracturing operations. Therefore, using gas turbine generators for electric fracturing is becoming a trend.

[0037] Gas turbines (referred to as gas turbines) often use natural gas as fuel during operation. However, well sites are often located in remote areas with limited natural gas pipeline coverage. To ensure a sufficient supply of natural gas at the well sites, the natural gas used is either compressed CNG (compressed natural gas) or excessively compressed LNG (liquefied natural gas) to ensure that a single tank can hold more natural gas. The compressed CNG and LNG are stored in transport tanks and then transported to the well sites for use according to the operational needs of the well sites.

[0038] Due to the performance requirements of the gas turbine itself, there are certain temperature and pressure requirements for the fuel entering the gas turbine. Natural gas from CNG or LNG compression tanks cannot directly enter the gas turbine without meeting the relevant requirements, which would damage the gas turbine. Therefore, the natural gas in the compression tank needs to be treated before entering the gas turbine through the fuel inlet. However, the pressure and temperature of the natural gas from CNG or LNG compression tanks cannot meet the fuel inlet pressure requirements. Therefore, the natural gas from the compression tank needs to be depressurized to the rated pressure required by the gas turbine, and at the same time, the natural gas from the compression tank needs to be heated to the rated temperature to meet the gas turbine inlet temperature requirements.

[0039] Furthermore, the performance of a gas turbine is closely related to its ambient temperature. When the ambient temperature rises, the air density decreases, reducing the mass of air entering the compressor and gas turbine, thus decreasing the gas turbine's output. Increased ambient temperature also lowers the compressor's compression ratio, further reducing the gas turbine's work output. Simultaneously, the decreased air density necessitates increased compressor power consumption to draw in the same mass of air, further reducing the gas turbine's output. To improve the performance of a gas turbine generator set and prevent a decrease in turbine output, the gas turbine's output can be increased by cooling the compressor's intake air.

[0040] Currently, intake air cooling is usually achieved by configuring an intake air cooling device (e.g., a lithium bromide refrigeration unit) or by spraying. However, configuring an intake air cooling device leads to higher equipment costs, while spraying cooling is low-cost but consumes a lot of water.

[0041] The heat exchange system, control method, and gas turbine generator set provided in this application include a first heat exchanger installed in the fuel pipeline of the gas turbine and a second heat exchanger installed at the intake end. When the ambient temperature is high, the heat transfer medium in the first heat exchanger is heated by external energy and exchanges heat with the fuel, causing the fuel to be heated and depressurized before flowing into the second heat exchanger. In the second heat exchanger, the heat transfer medium exchanges heat with the inlet gas, lowering the temperature of the inlet gas and thus achieving intake gas cooling. The heat transfer medium then flows back into the first heat exchanger, and this cycle repeats, achieving both fuel heating and depressurization while simultaneously cooling the intake gas. Compared to traditional methods that require intake cooling devices or spray systems for intake gas cooling, this application, based on the characteristic of compressed fuel absorbing heat during depressurization in actual use, can exchange heat with the higher-temperature heat transfer medium in the first heat exchanger, eliminating the need for an additional intake cooling device. This achieves intake gas cooling while also heating the compressed natural gas before it enters the gas turbine, reducing heating energy consumption and lowering costs.

[0042] In an exemplary embodiment, as shown in FIG1, a heat exchange system is provided for use in a gas turbine generator set. The gas turbine generator set includes a gas turbine, which has an inlet end and an exhaust end. The heat exchange system includes:

[0043] The first heat exchanger 110 is installed in the fuel pipeline of the gas turbine. After the fuel of the gas turbine exchanges heat with the heat transfer medium in the first heat exchanger 110, it enters the gas turbine through the fuel pipeline.

[0044] The second heat exchanger 120 is located at the inlet end. The inlet gas at the inlet end exchanges heat with the heat transfer medium in the second heat exchanger 120 before entering the gas turbine. The heat transfer medium inlet of the second heat exchanger 120 is connected to the heat transfer medium outlet of the first heat exchanger 110, and the heat transfer medium outlet of the second heat exchanger 120 is connected to the heat transfer medium inlet of the first heat exchanger 110.

[0045] The type and quantity of the first heat exchanger 110 and the second heat exchanger 120 can be set according to actual conditions, and are not limited in this embodiment; the fuel of the gas turbine can be set according to actual conditions, and natural gas is used as an example in this application; the inlet gas includes air.

[0046] As shown in Figure 1, the heat transfer medium inlet of each heat exchanger is simply referred to as the inlet, and the heat transfer medium outlet is simply referred to as the outlet.

[0047] Specifically, as shown in Figure 1, to ensure sufficient fuel is available at the operating site of the gas turbine generator set, compressed natural gas is typically transported to the site in a mobile storage tank. Due to the performance requirements of the gas turbine itself, the compressed natural gas from the mobile storage tank needs to be depressurized to the rated required pressure and heated to the rated required temperature to meet the gas turbine's temperature and pressure requirements for the fuel. The compressed fuel absorbs heat during depressurization. When the ambient temperature is high, the cooling medium in the first heat exchanger 110 is heated by external energy, which in turn heats the fuel. After being heated and depressurized, the fuel enters the gas turbine through the fuel pipeline. The heat transfer medium that has completed heat exchange with the fuel flows from the heat transfer medium outlet of the first heat exchanger 110 into the heat transfer medium inlet of the second heat exchanger 120. The heat transfer medium entering the second heat exchanger 120 exchanges heat with the inlet gas at the inlet end, cooling the inlet gas to increase its air density, thereby increasing the mass of combustion air in the gas turbine and thus increasing the output of the gas turbine. After completing the heat exchange with the inlet gas, the heat transfer medium flows from the heat transfer medium outlet of the second heat exchanger 120 into the heat transfer medium inlet of the first heat exchanger 110. This cycle is repeated, and energy is recycled. This green and environmentally friendly method heats the depressurized fuel while cooling the inlet gas.

[0048] It should be noted that the heat exchange system also includes a heat transfer medium replenishment device. The location of the heat transfer medium replenishment device can be set according to the actual situation, as long as it can achieve the function of replenishing the heat transfer medium. In addition, the type of heat transfer medium can be set according to the actual situation, and is not limited in this embodiment.

[0049] For example, a gas treatment device is also provided between the first heat exchanger and the gas turbine. The gas treatment device is installed in the gas pipeline. After the compressed natural gas is heated and depressurized, it is transported to the gas treatment device. After being further processed by the gas treatment device, clean natural gas with appropriate temperature and pressure is obtained, and then injected into the gas turbine as fuel for combustion.

[0050] The aforementioned heat exchange system includes a first heat exchanger installed in the fuel pipeline of the gas turbine and a second heat exchanger installed at the inlet end. The fuel in the gas turbine exchanges heat with the heat transfer medium in the first heat exchanger before continuing to enter the gas turbine through the fuel pipeline. The inlet gas at the inlet end exchanges heat with the heat transfer medium in the second heat exchanger before entering the gas turbine. The heat transfer medium circulates between the first and second heat exchangers. By utilizing the characteristic of fuel depressurization and heat absorption, the system heats the fuel while simultaneously cooling the inlet gas when the ambient temperature is high. Compared to traditional inlet gas cooling methods, this eliminates the need for additional inlet gas refrigeration equipment, thus reducing the temperature of the inlet gas and heating the fuel before it enters the gas turbine, thereby reducing heating energy consumption and costs.

[0051] In one embodiment, the heat transfer medium includes a coolant.

[0052] Specifically, the heat transfer medium can be other types of media, not limited to coolant, as long as it can perform the function of heat exchange.

[0053] In one embodiment, as shown in FIG2, the heat exchange system further includes:

[0054] The third heat exchanger 130 is located at the exhaust end, and the outlet gas at the exhaust end exchanges heat with the heat transfer medium inside the third heat exchanger 130. The heat transfer medium inlet of the third heat exchanger 130 is connected to the heat transfer medium outlet of the first heat exchanger 110, and the heat transfer medium outlet of the third heat exchanger 130 is connected to the heat transfer medium inlet of the first heat exchanger 110 and the heat transfer medium inlet of the second heat exchanger 120.

[0055] As shown in Figure 2, the heat transfer medium inlet of each heat exchanger is referred to as the inlet, and the heat transfer medium outlet is referred to as the outlet; the type and number of the third heat exchanger 130 can be set according to the actual situation, and are not limited in this embodiment.

[0056] Specifically, as shown in Figure 2, the heat transfer medium that has completed heat exchange with the fuel can also flow from the heat transfer medium outlet of the first heat exchanger 110 into the heat transfer medium inlet of the third heat exchanger 130. The heat transfer medium in the third heat exchanger 130 exchanges heat with the outlet gas at the exhaust end to utilize the heat in the outlet gas and heat the heat transfer medium in the third heat exchanger 130. The heated heat transfer medium can then flow from the heat transfer medium outlet of the third heat exchanger 130 into the heat transfer medium inlet of the first heat exchanger 110. The cooling medium in the first heat exchanger 110 continues to exchange heat with the fuel, thereby improving energy utilization and reducing the energy consumption required for fuel depressurization.

[0057] When the ambient temperature is low, the heat transfer medium after heating can flow from the heat transfer medium outlet of the third heat exchanger 130 into the heat transfer medium inlet of the second heat exchanger 120, so that the inlet gas at the inlet end can enter the gas turbine after heat exchange with the heat transfer medium in the second heat exchanger 120, preventing the equipment inside the gas turbine from being damaged due to the low inlet gas temperature. That is, the heat generated by the high temperature flue gas (outlet gas) discharged from the gas turbine is used to exchange heat with the inlet gas through the heat transfer medium to heat the inlet gas and play a role in preventing inlet icing.

[0058] In this embodiment of the application, the heat exchange system utilizes the energy in the outlet gas of the gas turbine by setting a third heat exchanger at the exhaust end. The third heat exchanger can heat the fuel and also heat the intake gas of the gas turbine when the ambient temperature is low, thus playing a role in preventing intake icing, reducing additional energy consumption and lowering costs.

[0059] To facilitate understanding by those skilled in the art, a specific example is used to illustrate the heat exchange system, as shown in Figure 3. The gas turbine can be equipped with a gas turbine intake system at its intake end and a gas turbine exhaust system at its exhaust end. The gas turbine is connected to a generator. The inlet gas includes external air at the intake end, and the outlet gas includes high-temperature flue gas. The heat transfer medium is a coolant.

[0060] When the ambient temperature is high, cryogenic fuel is supplied to the gas turbine through an external mobile natural gas storage tank. In the first heat exchanger, it exchanges heat with the coolant, transforming the high-temperature coolant into cryogenic coolant. The cryogenic coolant then enters the second heat exchanger through pipelines, where it exchanges heat with the outside air (inlet gas) that has not yet entered the gas turbine, cooling the outside air. The cryogenic coolant, having completed heat exchange with the outside air, is transformed into high-temperature coolant and discharged from the second heat exchanger. It then re-enters the first heat exchanger through pipelines to exchange heat with the cryogenic fuel. If coolant is insufficient during this process, it is replenished through a heat transfer medium replenishment device. Utilizing the cryogenic fuel's low-temperature characteristics, it can cool the intake gas in high-temperature environments, increasing the gas turbine's output, and also cool the exhaust gas. The high-temperature coolant generated after convection can be fed back into the cryogenic fuel for reheating, achieving energy recycling, improving energy efficiency, and reducing external energy consumption and additional equipment construction costs, thus lowering overall costs.

[0061] When the ambient temperature is low, icing may occur at the gas turbine's intake end (i.e., the gas turbine exhaust system) as the airflow accelerates. Without intervention, solids can enter the gas turbine, causing blade damage and significant property loss. Therefore, when the ambient temperature is below the dew point, to prevent the air intake from freezing, the low-temperature coolant formed in the first heat exchanger flows to the third heat exchanger. There, after passing through the high-temperature flue gas, it forms a high-temperature coolant, which flows to the second heat exchanger. The high-temperature coolant in the second heat exchanger then cools the cold external air... Heating is performed to prevent high-speed airflow from icing, which could increase the intake pressure resistance of the gas turbine or cause ice particles to enter the gas turbine and damage the turbine blades. After the coolant has completed its convection with the cold air, it continues to flow to the first heat exchanger to heat the low-temperature fuel. At the same time, the high-temperature coolant formed after the high-temperature flue gas convection can also flow to the first heat exchanger to heat the low-temperature fuel. Based on the high-temperature flue gas generated by the gas turbine exhaust system, it can both heat the intake gas to prevent icing and heat the low-temperature natural gas, reducing additional energy consumption and lowering costs.

[0062] In one embodiment, as shown in FIG4, the heat exchange system further includes:

[0063] A first valve is installed between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the first heat exchanger;

[0064] A second valve is installed between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the second heat exchanger;

[0065] A third valve is installed between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the second heat exchanger.

[0066] A fourth valve is installed between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the third heat exchanger.

[0067] Specifically, as shown in Figure 4, the heat exchange system is further equipped with a first valve, a second valve, a third valve, and a fourth valve. The first valve can be used to open or close the connection between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the first heat exchanger; the second valve can be used to open or close the connection between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the second heat exchanger; the third valve can be used to open or close the connection between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the second heat exchanger; and the fourth valve can be used to open or close the connection between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the third heat exchanger.

[0068] For example, as shown in Figure 4, an air filter can be installed at the inlet end of the gas turbine to filter the inlet gas, and a heat transfer medium replenishment device can be installed on the pipeline between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the second heat exchanger to replenish the heat transfer medium.

[0069] It should be noted that the functions of each heat exchanger in Figure 4 are the same as those described above, and will not be repeated in this embodiment.

[0070] In this embodiment, a first valve, a second valve, a third valve, and a fourth valve are respectively provided in the heat exchange system so that the corresponding valves can be opened or closed according to different ambient temperatures, thereby realizing different energy utilization methods, achieving the functions of intake air cooling and intake air anti-icing, while heating the fuel, reducing external energy consumption and costs.

[0071] In an exemplary embodiment, a control method is provided, as shown in FIG5, applied to the heat exchange system described above, the method comprising:

[0072] S502, obtain the control command corresponding to the current operating mode; wherein, the current operating mode is related to the ambient temperature of the heat exchange system.

[0073] Specifically, the current operating mode can be set manually by the user or automatically based on the detected ambient temperature, which is not limited in this embodiment; upon obtaining the current operating mode, the control command corresponding to the current operating mode is then obtained.

[0074] It should be noted that the control commands can be set manually by the user, or pre-set commands associated with the current working mode, which is not limited in this embodiment.

[0075] S504 controls the flow path of the heat transfer medium in the heat exchange system according to the control command.

[0076] Specifically, the flow path of the heat transfer medium in the heat exchange system is controlled according to the control commands. This allows the heat transfer medium in the first heat exchanger to be heated by external energy and exchange heat with the fuel when the ambient temperature is high. This causes the fuel to be heated and depressurized, and then flows into the second heat exchanger. In the second heat exchanger, the heat transfer medium exchanges heat with the inlet gas, reducing the temperature of the inlet gas and thus achieving inlet gas cooling. The heat transfer medium then flows back into the first heat exchanger, and this cycle repeats. This achieves fuel heating and depressurization while simultaneously cooling the inlet gas, reducing costs while increasing the output of the gas turbine generator set.

[0077] In one embodiment, the flow path of the heat transfer medium in the heat exchange system includes a first flow path between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the first heat exchanger, a second flow path between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the second heat exchanger, a third flow path between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the second heat exchanger, and a fourth flow path between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the third heat exchanger.

[0078] The flow path of the heat transfer medium in the heat exchange system is controlled according to control commands, including:

[0079] When the current operating mode is high temperature operating mode, the second circulation path is cut off and one or more of the third and fourth circulation paths are opened, and the first circulation path is opened when the fourth circulation path is in the open state.

[0080] When the current operating mode is low temperature operating mode, the third circulation path is cut off and one or more of the first and second circulation paths are opened, and when the first circulation path is in the open state, the fourth circulation path is opened.

[0081] The method for connecting or disconnecting each flow path can be set according to the actual situation, and is not limited in the embodiments of this application.

[0082] Specifically, when the current operating mode is high-temperature operating mode, the second flow path is cut off to prevent the heat transfer medium that has completed heat exchange with the outlet gas in the third heat exchanger from flowing into the second heat exchanger. When the third flow path is opened, the heat transfer medium can circulate between the first and second heat exchangers to heat the fuel and cool the intake gas. When both the first and fourth flow paths are opened, the heat transfer medium that has completed heat exchange with the fuel in the first heat exchanger can also flow to the third heat exchanger at the exhaust end to reduce the exhaust temperature. The function of the third heat exchanger is to conduct thermal convection between the high-temperature exhaust gas (outlet gas) and the heat transfer medium. After the thermal convection is completed, the heat transfer medium can flow back to the first heat exchanger to continue heating the low-temperature fuel.

[0083] It should be noted that one or more of the third and fourth circulation paths can be opened according to the actual situation, and no limitation is made in the embodiments of this application.

[0084] When the current operating mode is low-temperature operating mode, the third flow path is cut off to prevent the heat transfer medium that has completed heat exchange with the fuel in the first heat exchanger from flowing into the second heat exchanger. When both the first and fourth flow paths are open, the heat transfer medium that has completed heat exchange with the outlet gas in the third heat exchanger can flow into the first heat exchanger to heat the fuel. When both the second flow paths are open, the heat transfer medium that has completed heat exchange with the outlet gas in the third heat exchanger can flow into the second heat exchanger to heat the cold inlet gas and prevent high-speed airflow from freezing, which could increase the gas turbine inlet pressure resistance or cause ice particles to enter the gas turbine and damage the turbine blades. The heat transfer medium that has completed heat exchange with the inlet gas in the second heat exchanger can flow into the first heat exchanger to heat the low-temperature fuel.

[0085] It should be noted that one or more of the first and second flow paths can be opened according to the actual situation, and this application embodiment is not limited.

[0086] In this embodiment, the heat exchange system, by guiding the corresponding flow path according to the control command, heats the fuel and cools the intake air simultaneously when the ambient temperature is high. Compared with the traditional method of cooling the intake air, there is no need to configure additional intake air refrigeration equipment. This is beneficial for reducing the temperature of the inlet gas and can also heat the fuel before it enters the gas turbine. When the ambient temperature is low, it heats the intake gas of the gas turbine to prevent icing, thereby reducing additional energy consumption and lowering costs.

[0087] In one embodiment, the control command includes a valve control command; controlling the flow path of the heat transfer medium in the heat exchange system according to the control command includes:

[0088] When the current operating mode is high temperature operating mode, the second valve is disconnected and one or more of the third and fourth valves are turned on according to the valve control command; and if the fourth valve is turned on, the first valve is turned on.

[0089] When the current operating mode is low temperature operating mode, the third valve is disconnected according to the valve control command, and one or more of the first valve and the second valve are turned on. If the first valve is turned on, the fourth valve is turned on.

[0090] As shown in Figure 4, it can be understood that the first valve controls the opening or closing of the first flow path, the second valve controls the opening or closing of the second flow path, the third valve controls the opening or closing of the third flow path, and the fourth valve controls the opening or closing of the fourth flow path.

[0091] Specifically, under different current operating modes, the corresponding valves are controlled to open or close according to the valve control command, so as to heat the fuel and cool the intake air at the same time when the ambient temperature is high, and heat the intake gas of the gas turbine when the ambient temperature is low, so as to play the role of intake air anti-icing, reduce additional energy consumption and reduce costs.

[0092] To facilitate understanding by those skilled in the art, the control method of the heat exchange system is illustrated below with a specific example, as shown in Figure 4. The example uses coolant as the heat transfer medium and compressed natural gas as the fuel.

[0093] When the current operating mode is high-temperature operation, after the compressed natural gas (CNG) truck carrying CNG arrives at the work site, it transfers the CNG from the tank to the first heat exchanger via pipeline. The first heat exchanger contains coolant, which, when heated by external energy, can heat the CNG. After being heated and depressurized, the CNG is transported to the gas processing unit. After further processing by the gas processing unit, it obtains clean CNG at the appropriate temperature and pressure, which is then injected into the gas turbine as fuel for combustion. During this process, the coolant in the pipeline circulates continuously. The function of the first heat exchanger is to exchange heat between the high-temperature intake air and high-temperature flue gas of the gas turbine and the low-temperature fuel resulting from the depressurization of the CNG through the coolant. After heat convection exchange, the high-temperature coolant becomes low-temperature coolant, and the low-temperature gas becomes even hotter gas.

[0094] When the third valve is opened, the cryogenic coolant continues to circulate to the second heat exchanger. The function of the second heat exchanger is to exchange heat between the cryogenic coolant and the outside air (inlet gas) at a higher temperature through convection, converting the high-temperature air from the outside into low-temperature air, thereby increasing the air density, increasing the air mass per unit volume, and thus increasing the power of the gas turbine. At this time, the second valve is closed, and the high-temperature coolant after convection with the hot air flows to the first heat exchanger.

[0095] When the fourth valve is opened, the low-temperature coolant generated by the first heat exchanger can also flow to the third heat exchanger at the exhaust end to reduce the exhaust temperature. The function of the third heat exchanger is to conduct thermal convection between the high-temperature exhaust gas and the low-temperature compressed gas formed by the first heat exchanger through the coolant. When the first valve is opened and the second valve is closed, the high-temperature coolant formed by the third heat exchanger can flow back to the first heat exchanger to continue heating the low-temperature gas. In this embodiment, one or more of the third and fourth valves can be opened according to the actual situation, which is not limited.

[0096] When the current operating mode is low-temperature operation mode, the intake gas needs to be heated to prevent icing. At this time, the third valve is disconnected and the fourth valve is opened. The low-temperature coolant formed after passing through the first heat exchanger flows to the third heat exchanger. The second valve is opened, and the high-temperature coolant formed after passing through the high-temperature flue gas convection flows through the second valve to the second heat exchanger. The coolant in the second heat exchanger heats the cold outside air to prevent the high-speed airflow from icing, which would increase the intake pressure resistance of the gas turbine or cause ice particles to enter the gas turbine and damage the turbine blades. After the coolant has completed convection with the cold air, it continues to flow to the first heat exchanger to heat the low-temperature gas.

[0097] When the third valve is disconnected and the first and fourth valves are connected, the high-temperature coolant formed through the third heat exchanger can flow directly to the first heat exchanger to heat the compressed natural gas. In this embodiment, one or more of the first and second valves can be connected according to the actual situation, which is not limited in this application.

[0098] It should be noted that the fifth valve should be disconnected during normal operation. When the fifth valve is turned on, coolant can be added to the pipeline in a timely manner.

[0099] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0100] Based on the same inventive concept, this application also provides a control device for implementing the control method described above. The solution provided by this device is similar to the solution described in the above method; therefore, specific limitations in one or more control device embodiments provided below can be found in the limitations of the control method described above, and will not be repeated here.

[0101] In an exemplary embodiment, as shown in FIG6, a control device 600 is provided, applied to the heat exchange system described above, the device comprising:

[0102] The acquisition module 601 is used to acquire the control command corresponding to the current operating mode; wherein, the current operating mode is related to the current ambient temperature of the heat exchange system;

[0103] The flow path control module 602 is used to control the flow path of the heat transfer medium in the heat exchange system according to control commands.

[0104] In one embodiment, the flow path of the heat transfer medium in the heat exchange system includes a first flow path between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the first heat exchanger, a second flow path between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the second heat exchanger, a third flow path between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the second heat exchanger, and a fourth flow path between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the third heat exchanger.

[0105] The flow path control module 602 is also used to cut off the second flow path and open one or more of the third and fourth flow paths when the current operation mode is the high temperature operation mode, and to open the first flow path when the fourth flow path is in the open state.

[0106] When the current operating mode is low temperature operating mode, the third circulation path is cut off and one or more of the first and second circulation paths are opened, and when the first circulation path is in the open state, the fourth circulation path is opened.

[0107] In one embodiment, the control command includes a valve control command; the flow path control module 602 is further configured to, when the current operating mode is a high-temperature operating mode, disconnect the second valve and open one or more of the third and fourth valves according to the valve control command, and open the first valve when the fourth valve is open;

[0108] When the current operating mode is low temperature operating mode, the third valve is disconnected according to the valve control command, and one or more of the first valve and the second valve are turned on. If the first valve is turned on, the fourth valve is turned on.

[0109] Each module in the aforementioned control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0110] In one exemplary embodiment, a gas turbine generator set is provided, the gas turbine generator set including a gas turbine, the gas turbine being provided with an intake end and an exhaust end;

[0111] The gas turbine generator set also includes the heat exchange system described above.

[0112] Specifically, the gas turbine generator set also includes a gas treatment device, a gas turbine intake system, a gas turbine exhaust system, and a generator; the gas treatment device is located between the first heat exchanger and the gas turbine, and the gas turbine intake system, the gas turbine, the gas turbine exhaust system, and the generator are connected in sequence.

[0113] Each module in the control device of the aforementioned heat exchange system can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0114] As used herein, the terms “component,” “module,” and “system,” etc., are intended to refer to a computer-related entity that can be hardware, a hardware and software assembly, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, executable code, an executing thread, a program, and / or a computer. For illustration, an application running on a server and the server itself can both be components. One or more components may reside in a process and / or an executing thread, and components may be located within a single computer and / or distributed across two or more computers.

[0115] In an exemplary embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram is shown in Figure 7. The computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are connected to the system bus via the input / output interface. The processor of the computer device provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface of the computer device is used for exchanging information between the processor and external devices. The communication interface of the computer device is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, Near Field Communication (NFC), or other technologies. When the computer program is executed by the processor, it implements a control method. The display unit of the computer device is used to form a visually visible image and may be a display screen, a projection device, or a virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0116] Those skilled in the art will understand that the structure shown in Figure 7 may be a block diagram of a partial structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0117] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the control method described above.

[0118] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the above-described control method.

[0119] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the control method described above.

[0120] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0121] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0122] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0123] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A heat exchange system, wherein, The application is applied to a gas turbine generator set, which comprises a gas turbine provided with an air inlet end and an air outlet end; the heat exchange system comprises: a first heat exchanger arranged in a fuel pipeline of the gas turbine, fuel of the gas turbine enters the gas turbine through the fuel pipeline after heat exchange with heat transfer medium in the first heat exchanger; a second heat exchanger arranged at the air inlet end, inlet gas of the air inlet end enters the gas turbine after heat exchange with heat transfer medium in the second heat exchanger, wherein a heat transfer medium inlet of the second heat exchanger is communicated with a heat transfer medium outlet of the first heat exchanger, and a heat transfer medium outlet of the second heat exchanger is communicated with a heat transfer medium inlet of the first heat exchanger.

2. The heat exchange system of claim 1, wherein, The heat exchange system further comprises: a third heat exchanger arranged at the air outlet end, outlet gas of the air outlet end exchanges heat with heat transfer medium in the third heat exchanger, wherein a heat transfer medium inlet of the third heat exchanger is communicated with a heat transfer medium outlet of the first heat exchanger, and heat transfer medium outlets of the third heat exchanger are respectively communicated with the heat transfer medium inlet of the first heat exchanger and the heat transfer medium inlet of the second heat exchanger.

3. The heat exchange system of claim 2, wherein, The heat exchange system further comprises: a first valve arranged between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the first heat exchanger; a second valve arranged between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium outlet of the second heat exchanger; a third valve arranged between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the second heat exchanger; a fourth valve arranged between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium outlet of the third heat exchanger.

4. The heat exchange system according to any one of claims 1 to 3, wherein The heat transfer medium comprises cooling liquid.

5. A control method, wherein, The application is applied to the heat exchange system of any one of claims 1 to 4, and the method comprises: obtaining control instructions corresponding to a current operation mode, wherein the current operation mode is related to an ambient temperature in which the heat exchange system currently locates; controlling a flow path of heat transfer medium in the heat exchange system according to the control instructions.

6. The method of claim 5, wherein, The flow path of heat transfer medium in the heat exchange system comprises a first flow path between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of first heat exchanger, a second flow path between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium outlet of second heat exchanger, a third flow path between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium outlet of second heat exchanger, and a fourth flow path between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of third heat exchanger; controlling the flow path of heat transfer medium in the heat exchange system according to the control instructions comprises: when the current operation mode is a high-temperature operation mode, the second flow path is cut off, one or more of the third flow path and the fourth flow path is turned on, and the first flow path is turned on when the fourth flow path is in the on state. When the current operation mode is a low-temperature operation mode, the third flow path is cut off, one or more of the first flow path and the second flow path is turned on, and when the first flow path is turned on, the fourth flow path is turned on.

7. The method of claim 6, wherein, The control instruction includes a valve control instruction; and the controlling the flow path of the heat transfer medium in the heat exchange system according to the control instruction includes: When the current operation mode is a high-temperature operation mode, the second valve is cut off according to the valve control instruction, one or more of the third valve and the fourth valve is turned on, and when the fourth valve is turned on, the first valve is turned on. When the current operation mode is a low-temperature operation mode, the third valve is cut off according to the valve control instruction, one or more of the first valve and the second valve is turned on, and when the first valve is turned on, the fourth valve is turned on.

8. A control device, wherein, The device is applied to the heat exchange system in any one of claims 1 to 4, and the device comprises: an acquisition module configured to acquire a control instruction corresponding to a current operation mode, wherein the current operation mode is related to an ambient temperature in which the heat exchange system currently locates; a flow path control module configured to control a flow path of a heat transfer medium in the heat exchange system according to the control instruction.

9. A gas turbine generator set wherein, The gas turbine generator set comprises a gas turbine, and the gas turbine is provided with an air inlet end and an air outlet end; The gas turbine generator set further comprises the heat exchange system in any one of claims 1 to 4.

10. A computer device comprising a memory and a processor, the memory storing a computer program, wherein, The processor executes the computer program to implement the steps of the method in any one of claims 5 to 7. The processor executes the computer program to implement the steps of the method in any one of claims 5 to 7.

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