Heat exchange system, control method and gas turbine generator set

Abstract

The invention relates 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 pipeline of the gas turbine and a second heat exchanger arranged at the gas inlet end, and fuel of the gas turbine continuously enters the gas turbine through the fuel pipeline after exchanging heat with a heat transfer medium in the first heat exchanger. Inlet gas of the gas inlet end enters the gas turbine after exchanging heat with a heat transfer medium in the second heat exchanger, and the heat transfer medium circulates in the first heat exchanger and the second heat exchanger; by the adoption of the heat exchange system, air inlet cooling can be carried out while fuel heating and pressure reduction are achieved under the condition that the environment temperature is high, cost is reduced, and meanwhile output of the gas turbine generator set is improved.

Description

Technical Field

[0001] The present application relates to the technical field of gas turbines, and particularly to a heat exchange system, a control method, and a gas turbine generator set. Background Art

[0002] The performance of a gas turbine generator set is closely related to the ambient temperature it is in. When the ambient temperature rises, the air density is smaller, and the mass of air inhaled at the intake end of the gas turbine generator set decreases, resulting in a decrease in the output of the gas turbine generator set. To increase the output of the gas turbine generator set, in traditional methods, an intake air cooling device or spraying is usually used to cool the intake air. However, the traditional methods have the problem of high cost. Summary of the Invention

[0003] Based on this, it is necessary to provide a heat exchange system, a control method, and a gas turbine generator set that can reduce costs for the above technical problems.

[0004] In a first aspect, the present application provides a heat exchange system applied to a gas turbine generator set. The gas turbine generator set includes a gas turbine, and an intake end and an exhaust end are provided on the gas turbine; the heat exchange system includes:

[0005] A first heat exchanger is provided 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, it enters the gas turbine through the fuel pipeline.

[0006] A second heat exchanger is provided at the intake end. The inlet gas at the intake end enters the gas turbine after exchanging heat with the heat transfer medium in the second heat exchanger. Among them, 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.

[0007] In one embodiment, the heat exchange system further includes:

[0008] A third heat exchanger is provided at the exhaust end. The outlet gas at the exhaust end exchanges heat with the heat transfer medium in the third heat exchanger; among them, the heat transfer medium inlet of the third heat exchanger is connected to the heat transfer medium outlet of the first heat exchanger, and the heat transfer medium outlet of the third heat exchanger is respectively connected to the heat transfer medium inlet of the first heat exchanger and the heat transfer medium inlet of the second heat exchanger.

[0009] In one embodiment, the heat exchange system further includes:

[0010] A first valve provided between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the first heat exchanger;

[0011] a second valve disposed between a heat transfer medium outlet of the third heat exchanger and a heat transfer medium inlet of the second heat exchanger;

[0012] a third valve disposed between a heat transfer medium outlet of the first heat exchanger and a heat transfer medium inlet of the second heat exchanger;

[0013] A fourth valve is arranged between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the third heat exchanger.

[0014] In one embodiment, the heat transfer medium includes a cooling fluid.

[0015] In a second aspect, the present application further provides a control method, which is applied to the above-mentioned heat exchange system, and the method comprises:

[0016] Obtaining the control instruction corresponding to the current operation mode; wherein the current operation mode is related to the current ambient temperature of the heat exchange system;

[0017] The flow path of the heat transfer medium in the heat exchange system is controlled according to the control instructions.

[0018] 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;

[0019] Control the flow path of the heat transfer medium in the heat exchange system according to the control instructions, including:

[0020] When the current operation mode is the high temperature operation mode, the second flow path is cut off, and the third flow path and / or the fourth flow path are turned on, and when the fourth flow path is in the turned-on state, the first flow path is turned on;

[0021] When the current operation mode is the low temperature operation mode, the third flow path is cut off, and the first flow path and / or the second flow path are opened, and when the first flow path is in the open state, the fourth flow path is opened.

[0022] In one embodiment, the control instruction includes a valve control instruction; and controlling the flow path of the heat transfer medium in the heat exchange system according to the control instruction includes:

[0023] When the current operation mode is the high temperature operation mode, the second valve is disconnected according to the valve control instruction, the third valve and / or the fourth valve are turned on, and when the fourth valve is turned on, the first valve is turned on;

[0024] When the current operation mode is the low-temperature operation mode, disconnect the third valve according to the valve control instruction, conduct the first valve and / or the second valve, and when the first valve is conducted, conduct the fourth valve.

[0025] In a third aspect, the present application further provides a control device applied to the above heat exchange system. The device includes:

[0026] An acquisition module for acquiring the control instruction corresponding to the current operation mode; wherein, the current operation mode is related to the ambient temperature where the heat exchange system is currently located;

[0027] A circulation path control module for controlling the circulation path of the heat transfer medium in the heat exchange system according to the control instruction.

[0028] In a fourth aspect, the present application further provides a gas turbine generator set, which includes a gas turbine, and an air inlet end and an exhaust end are provided on the gas turbine;

[0029] Wherein, the gas turbine generator set further includes the heat exchange system as described above.

[0030] In a fifth aspect, the present application further provides a computer device, which includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of the above method are implemented.

[0031] For the above heat exchange system, control method and gas turbine generator set, the heat exchange system includes a first heat exchanger arranged in the fuel pipeline of the gas turbine and a second heat exchanger arranged at the air inlet end. Wherein, after the fuel of the gas turbine exchanges heat with the heat transfer medium in the first heat exchanger, it continues to enter the gas turbine through the fuel pipeline. The inlet gas at the air inlet end exchanges heat with the heat transfer medium in the second heat exchanger and then enters the gas turbine. The heat transfer medium circulates in the first heat exchanger and the second heat exchanger. In the present application, when the ambient temperature is relatively high, the heat transfer medium in the first heat exchanger is heated by the energy from the outside and then exchanges heat with the fuel, so that the fuel is heated and depressurized and flows into the second heat exchanger. The heat transfer medium exchanges heat with the inlet gas in the second heat exchanger to reduce the temperature of the inlet gas, thereby realizing intake air cooling. The heat transfer medium flows back into the first heat exchanger and circulates in this way, realizing fuel heating and depressurization while performing intake air cooling. Compared with the traditional method that requires configuring an intake air cooling device or spraying to cool the intake air, the cost is reduced and the output of the gas turbine generator set is increased. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 It is a schematic structural diagram of a heat exchange system in an embodiment;

[0034] Figure 2 It is a schematic structural diagram of a heat exchange system in another embodiment;

[0035] Figure 3 It is a schematic connection diagram of a heat exchange system in an embodiment;

[0036] Figure 4 It is a schematic connection diagram of a heat exchange system in another embodiment;

[0037] Figure 5 It is a schematic flowchart of a control method in an embodiment;

[0038] Figure 6 It is a structural block diagram of a control device in an embodiment;

[0039] Figure 7 It is an internal structural diagram of a computer device in an embodiment. Detailed implementation manners

[0040] To facilitate the understanding of the present application, the following will describe the present application more comprehensively with reference to the relevant drawings. Embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0042] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0043] Spatial relationship terms such as "under", "below", "beneath", "underneath", "above", "over", etc. can be used herein to describe the relationship of one element or feature shown in the figure with other elements or features. It should be understood that, in addition to the orientations shown in the figure, spatial relationship terms also include different orientations of the device during use and operation. For example, if the device in the attached drawing is flipped, an element or feature described as "under other elements" or "beneath them" or "underneath them" will be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "underneath" can include both upward and downward orientations. In addition, the device may also have additional orientations (such as rotating 90 degrees or other orientations), and the spatial descriptors used herein are accordingly interpreted.

[0044] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or connected to the other element through an intermediate element. In addition, for "connection" in the following embodiments, if there is a transfer of electrical signals or data between the connected objects, it should be understood as "electrically connected", "communicatively connected", etc.

[0045] As used herein, the singular forms of "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the existence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0046] For the oil industry, the fracturing operation is an extremely energy-consuming task. Conventional fracturing often relies on diesel engines to drive piston pumps for fracturing operations. Diesel-driven fracturing is seriously polluting, noisy, has a small power density, and a large well site occupation area, which severely restricts the development of the fracturing industry. With the development of technology, based on the characteristics of electric-driven fracturing operations, the fracturing operation is developing towards electric drive.

[0047] In the actual application of electric-drive fracturing operations, during the fracturing operation process, there is a relatively large demand for electric power. For the power demand, relying on the power grid for power supply has certain limitations because current well sites are often distributed in various remote areas with limited power availability. Many rely on mobile generator sets that are easy to relocate. The power density of the previous reciprocating generator sets was limited. Compared with gas turbine generator sets, they would occupy a larger well site area. For well sites with limited land area, the smaller the land occupation and the greater the power density of the generator set, the more conducive it is to the operation under fracturing conditions. Therefore, the use of gas turbine power generation in electric-drive fracturing is becoming a trend.

[0048] Gas turbines (referred to as GTs for short) often use natural gas as fuel during the operation process. However, well sites are often distributed in various remote areas with limited distribution of natural gas pipelines. To ensure sufficient natural gas at the well site, the natural gas used at the well site is CNG (Compressed Natural Gas) after compression or over-compressed LNG (Liquefied Natural Gas) to ensure that a single tank can carry more natural gas. The compressed CNG and LNG are stored in transportation tanks and then transported to the well site for use according to the well site operation requirements.

[0049] Due to the performance requirements of the GT itself, there are certain temperature and pressure requirements for the fuel entering the GT. If the natural gas in the CNG or LNG compression tank directly enters the GT, it does not meet the relevant requirements and will cause damage to the GT. Therefore, the natural gas in the compression tank needs to be processed and then enters the GT through the fuel inlet. For the natural gas in the CNG or LNG compression tank, its pressure cannot meet the pressure requirements of the fuel inlet, and its temperature also cannot meet the temperature requirements of the fuel inlet. Therefore, the natural gas from the compression tank needs to be decompressed to the rated demand pressure of the GT, and at the same time, the natural gas from the compression tank needs to be heated to the rated temperature to meet the GT inlet temperature requirements.

[0050] Furthermore, the performance of the gas turbine is closely related to the ambient temperature. When the ambient temperature rises, the air density decreases, and the mass of air entering the compressor and gas turbine in the GT decreases, resulting in a decrease in the output of the gas turbine. The increase in ambient temperature will also cause the compression ratio of the compressor to decrease, resulting in a reduction in the work done by the gas turbine. At the same time as the ambient temperature rises, the air density decreases. If you want to inhale the same mass of air, the power consumption of the compressor also needs to increase, resulting in a further decrease in the output of the gas turbine. To improve the performance of the gas turbine generator set and avoid a decrease in the output of the turbine, the intake air of the compressor can be cooled to increase the output of the GT.

[0051] Currently, the intake air is usually cooled by configuring an intake air cooling device (e.g., a lithium bromide refrigeration unit) or spraying. However, configuring an intake air cooling device will lead to the problem of high device cost, and the spraying cooling method has a low cost but has the problem of large water consumption.

[0052] The heat exchange system, control method, and gas turbine generator set provided by the embodiments of the present application. The heat exchange system includes a first heat exchanger disposed in the fuel pipeline of the gas turbine and a second heat exchanger disposed at the intake end. When the ambient temperature is relatively high, the heat transfer medium in the first heat exchanger is heated by the energy from the outside and then exchanges heat with the fuel, causing the fuel to be heated and depressurized and flowing into the second heat exchanger. The heat transfer medium exchanges heat with the inlet gas in the second heat exchanger to lower the temperature of the inlet gas, thereby achieving intake air cooling. The heat transfer medium flows back into the first heat exchanger and circulates in this way, achieving intake air cooling while heating and depressurizing the fuel. Compared with the traditional method of cooling the intake air by configuring an intake air cooling device or spraying, based on the characteristic that the compressed fuel absorbs heat during depressurization in actual use, the present application can exchange heat with the relatively high-temperature heat transfer medium in the first heat exchanger, without the need to additionally configure an intake air cooling device, achieving intake air cooling and heating the compressed natural gas before it enters the gas turbine, reducing the consumption of heating energy and lowering the cost.

[0053] In an exemplary embodiment, as Figure 1 shown, a heat exchange system is provided, which is applied to a gas turbine generator set. The gas turbine generator set includes a gas turbine, and an intake end and an exhaust end are provided on the gas turbine; the heat exchange system includes:

[0054] A first heat exchanger 110, which is disposed 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;

[0055] A second heat exchanger 120, which is disposed at the intake end. The inlet gas at the intake end enters the gas turbine after exchanging heat with the heat transfer medium in the second heat exchanger 120. Among them, 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.

[0056] Among them, the types and quantities of the first heat exchanger 110 and the second heat exchanger 120 can be set according to actual situations and are not limited in the embodiments of the present application; the fuel of the gas turbine can be set according to actual situations, and in the present application, natural gas is taken as an example for illustration; the inlet gas includes air.

[0057] Among them, as Figure 1As shown, the inlet of the heat transfer medium of each heat exchanger is simply referred to as the inlet, and the outlet of the heat transfer medium is simply referred to as the outlet.

[0058] Specifically, as Figure 1 shown, to ensure that there is sufficient fuel in the operating site where the gas turbine generator set is located, compressed natural gas is usually transported to the operating site after being placed 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 decompressed to the rated required pressure and heated to the rated required temperature to meet the temperature and pressure requirements of the fuel for the gas turbine. When the compressed fuel is decompressed, it absorbs heat. In the case of a relatively high ambient temperature, after the cooling medium in the first heat exchanger 110 is heated by the energy from the outside, it heats the fuel. After the fuel is heated and decompressed, it enters the gas turbine through the fuel pipeline. The heat transfer medium that has completed the 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 intake end to cool the inlet gas, thereby increasing the air density of the inlet gas, and then increasing the combustion air quality in the gas turbine, and thus increasing the output of the gas turbine. After the heat transfer medium has completed the heat exchange with the inlet gas, it 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, and so on in a cycle, recycling energy, and heating the decompressed fuel in a green and environmentally friendly manner while cooling the intake air.

[0059] It should be noted that the heat transfer system also includes a heat transfer medium replenishing device. The installation position of the heat transfer medium replenishing 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 the heat transfer medium can be set according to the actual situation and is not limited in the embodiments of the present application.

[0060] Exemplarily, a gas treatment device is also provided between the first heat exchanger and the gas turbine. The gas treatment device is arranged in the gas pipeline. After the compressed natural gas is heated and decompressed, it is transported to the gas treatment device, and after being further processed by the gas treatment device, clean natural gas at the appropriate temperature and pressure is obtained, and then injected into the gas turbine as fuel for combustion.

[0061] The above heat exchange system includes a first heat exchanger disposed in the fuel pipeline of a gas turbine and a second heat exchanger disposed at the intake end. Wherein, after the fuel of the gas turbine exchanges heat with the heat transfer medium in the first heat exchanger, it continues to enter the gas turbine through the fuel pipeline. The inlet gas at the intake end exchanges heat with the heat transfer medium in the second heat exchanger and then enters the gas turbine. The heat transfer medium circulates in the first heat exchanger and the second heat exchanger. By virtue of the characteristic of the fuel absorbing heat during decompression, when the ambient temperature is relatively high, while heating the fuel, the intake air is cooled. Compared with the traditional method of cooling the intake air, there is no need to configure additional intake air refrigeration equipment, which is beneficial to reducing the temperature of the inlet gas and can also heat the fuel before it enters the gas turbine, reducing the consumption of heating energy and cost at the same time.

[0062] In one embodiment, the heat transfer medium includes a coolant.

[0063] Specifically, the heat transfer medium can also be other types of media, not limited to the coolant, as long as it can complete the function of heat exchange.

[0064] In one embodiment, as Figure 2 shown, the heat exchange system further includes:

[0065] A third heat exchanger 130, disposed at the exhaust end, and the outlet gas at the exhaust end exchanges heat with the heat transfer medium in the third heat exchanger 130; wherein, the heat transfer medium inlet of the third heat exchanger 130 is communicated with the heat transfer medium outlet of the first heat exchanger 110, and the heat transfer medium outlet of the third heat exchanger 130 is respectively communicated with the heat transfer medium inlet of the first heat exchanger 110 and the heat transfer medium inlet of the second heat exchanger 120.

[0066] Wherein, as Figure 2 shown, 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; the type and quantity of the third heat exchanger 130 can be set according to actual situations and are not limited in the embodiments of the present application.

[0067] Specifically, as Figure 2 shown, 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 entering the third heat exchanger 130 exchanges heat with the outlet gas at the exhaust end to realize the utilization of the heat in the outlet gas and heat the heat transfer medium in the third heat exchanger 130. The heat transfer medium after completion of heating can 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, and the cooling medium in the first heat exchanger 110 continues to exchange heat with the fuel, thereby improving the energy utilization rate and reducing the energy consumption required for fuel decompression.

[0068] When the ambient temperature is relatively low, the heat transfer medium after heating can also 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 intake end enters 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 low intake temperature. That is, the heat generated by the high-temperature flue gas (outlet gas) discharged from the gas turbine is used to conduct heat exchange with the inlet gas through the heat transfer medium to heat the inlet gas, playing a role in preventing ice formation in the intake air.

[0069] In the embodiment of the present application, the heat exchange system realizes the utilization of the energy in the outlet gas of the gas turbine by arranging a third heat exchanger at the exhaust end, which can not only heat the fuel but also heat the intake gas of the gas turbine when the ambient temperature is relatively low, playing a role in preventing ice formation in the intake air, reducing the additional energy consumption while reducing the cost.

[0070] For the convenience of understanding by those skilled in the art, a specific example is given below to illustrate the heat exchange system, as Figure 3 shown. Among them, a gas turbine intake system can be arranged at the intake end of the gas turbine, a gas turbine exhaust system can be arranged at the exhaust end of the gas turbine, and the gas turbine is connected to a generator; the inlet gas includes the external air at the intake end, and the outlet gas includes high-temperature flue gas; the heat transfer medium is a coolant.

[0071] When the ambient temperature is relatively high, the low-temperature fuel supplied to the gas turbine by an external mobile natural gas storage tank exchanges heat with the coolant in the first heat exchanger, exchanging the high-temperature coolant into a low-temperature coolant. The low-temperature coolant enters the second heat exchanger through a pipeline and exchanges heat with the outside air (inlet gas) that has not entered the gas turbine in the second heat exchanger to cool the outside air. The low-temperature coolant that has completed heat exchange with the outside air is transformed into a high-temperature coolant and discharged from the second heat exchanger, and then enters the first heat exchanger again through a pipeline to exchange heat with the low-temperature fuel. If there is a shortage of coolant during the process, the cooling medium is supplemented through a heat transfer medium replenishing device. By virtue of the low-temperature characteristics of the low-temperature fuel, in a high-temperature environment, it can not only cool the intake gas to improve the output of the gas turbine but also cool the exhaust gas of the gas turbine. For the high-temperature coolant generated after convection, it can be used to reheat the low-temperature fuel again, realizing the recycling of energy, improving the energy utilization rate, being green and environmentally friendly while reducing the external energy consumption, avoiding the additional equipment construction cost, and reducing the cost.

[0072] When the ambient temperature is relatively low, with the acceleration of the airflow, icing may occur at the intake end of the gas turbine, that is, in the exhaust system of the gas turbine. If not handled, solids may enter the gas turbine, causing blade damage and significant property losses. Therefore, when the external environment is below the dew point, to prevent the air inhaled by the gas turbine from icing, the low-temperature coolant formed after passing through the first heat exchanger flows to the third heat exchanger. At this time, after convection with the high-temperature flue gas, a high-temperature coolant is formed and flows to the second heat exchanger. The high-temperature coolant in the second heat exchanger heats the external cold air to prevent the high-speed airflow from icing, which may cause an increase in the intake air pressure resistance of the gas turbine or ice particles from entering the gas turbine and damaging the blades of the gas turbine. After convection with the cold air, the coolant continues to flow to the first heat exchanger to heat the low-temperature fuel. At the same time, the high-temperature coolant formed after convection with the high-temperature flue gas 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 not only heat the intake gas to prevent icing of the intake air, but also heat the low-temperature natural gas, reducing additional energy consumption and costs.

[0073] In one embodiment, as Figure 4 shown, the heat exchange system further includes:

[0074] A first valve provided between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the first heat exchanger;

[0075] A second valve provided between the heat transfer medium outlet of the third heat exchanger and the heat transfer medium inlet of the second heat exchanger;

[0076] A third valve provided between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the second heat exchanger;

[0077] A fourth valve provided between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the third heat exchanger.

[0078] Specifically, as Figure 4 shown, the heat exchange system is also respectively provided with a first valve, a second valve, a third valve, and a fourth valve. The first valve can be used to conduct or cut off 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 conduct or cut off 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 conduct or cut off the connection between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the second heat exchanger; the second valve can be used to conduct or cut off the connection between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the third heat exchanger.

[0079] Exemplarily, as Figure 4As shown, an air filter may be provided at the air inlet end of the gas turbine to filter the inlet gas. The heat transfer medium replenishing device may be provided 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.

[0080] It should be noted that Figure 4 the functions of the heat exchangers in are the same as those described above, and will not be elaborated in the embodiments of the present application.

[0081] In the embodiments of the present application, a first valve, a second valve, a third valve, and a fourth valve are respectively provided in the heat exchange system, so as to control the corresponding valves to be turned on or off according to different ambient temperatures subsequently, realize different energy utilization modes, thereby realizing the functions of intake air cooling and intake air anti-icing, and heating the fuel at the same time, reducing external energy consumption and costs.

[0082] In an exemplary embodiment, a control method is provided, as Figure 5 shown, applied to the above heat exchange system, the method includes:

[0083] S502, obtaining a control instruction corresponding to the current operation mode; wherein, the current operation mode is related to the ambient temperature where the heat exchange system is currently located.

[0084] Specifically, the current operation mode can be set manually by the user, or can be automatically set according to the detected ambient temperature, which is not limited in the embodiments of the present application; in the case of obtaining the current operation mode, continue to obtain the control instruction corresponding to the current operation mode.

[0085] It should be noted that the control instruction can be set manually by the user, or can be a pre-set instruction associated with the current operation mode, which is not limited in the embodiments of the present application.

[0086] S504, controlling the flow path of the heat transfer medium in the heat exchange system according to the control instruction.

[0087] Specifically, respectively control the flow path of the heat transfer medium in the heat exchange system according to the control instruction, so as to realize that when the ambient temperature is relatively high, the heat transfer medium in the first heat exchanger is heated by the energy from the outside and then exchanges heat with the fuel, so that the fuel is heated and depressurized, and flows into the second heat exchanger. The heat transfer medium exchanges heat with the inlet gas in the second heat exchanger to reduce the temperature of the inlet gas, thereby realizing intake air cooling. The heat transfer medium flows back into the first heat exchanger and circulates in this way, realizing fuel heating and depressurization while performing intake air cooling, reducing costs while increasing the output of the gas turbine generator set.

[0088] 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;

[0089] Controlling the flow path of the heat transfer medium in the heat exchange system according to a control instruction includes:

[0090] When the current operation mode is a high-temperature operation mode, the second flow path is truncated, and the third flow path and / or the fourth flow path are conducted. And when the fourth flow path is in a conducted state, the first flow path is conducted;

[0091] When the current operation mode is a low-temperature operation mode, the third flow path is truncated, and the first flow path and / or the second flow path are conducted. And when the first flow path is in a conducted state, the fourth flow path is conducted.

[0092] Wherein, the manner for conducting or truncating each flow path can be set according to the actual situation and is not limited in the embodiments of the present application.

[0093] Specifically, when the current operation mode is a high-temperature operation mode, the second flow path is truncated 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. If the third flow path is conducted, the heat transfer medium can circulate between the first heat exchanger and the second heat exchanger to realize the heating of the fuel and the cooling of the intake air. If both the first flow path and the fourth flow path are conducted, 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 emission temperature. The function of the third heat exchanger is to perform heat convection between the discharged high-temperature flue gas (outlet gas) and the heat transfer medium, and the heat transfer medium after completing the heat convection can flow back to the first heat exchanger to continue heating the low-temperature fuel.

[0094] It should be noted that the third flow path and / or the fourth flow path can be conducted according to the actual situation and are not limited in the embodiments of the present application.

[0095] When the current operating mode is the 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. If the first flow path and the fourth flow path are both connected, 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. If the second flow paths are both connected, 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 external cold inlet gas to prevent high-speed airflow from freezing, causing the gas turbine inlet pressure resistance to increase or ice particles to enter the gas turbine and damage the gas 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.

[0096] It should be noted that the first flow path and / or the second flow path can be opened according to actual conditions, which is not limited in the embodiments of the present application.

[0097] In the embodiment of the present application, by conducting the corresponding flow path according to the control instruction, when the ambient temperature is high, the fuel is heated and the intake air is cooled at the same time. Compared with the traditional method of cooling the intake air, there is no need to configure additional intake air refrigeration equipment, which is beneficial to reducing the temperature of the inlet gas and can also heat the fuel before entering the gas turbine. When the ambient temperature is low, the intake gas of the gas turbine is heated to play a role in intake air anti-icing, thereby reducing additional energy consumption and reducing costs.

[0098] In one embodiment, the control instruction includes a valve control instruction; and controlling the flow path of the heat transfer medium in the heat exchange system according to the control instruction includes:

[0099] When the current operation mode is the high temperature operation mode, the second valve is disconnected according to the valve control instruction, the third valve and / or the fourth valve are turned on, and when the fourth valve is turned on, the first valve is turned on;

[0100] When the current operation mode is the low temperature operation mode, the third valve is disconnected according to the valve control instruction, the first valve and / or the second valve are turned on, and when the first valve is turned on, the fourth valve is turned on.

[0101] Among them, Figure 4 As shown, it can be understood that the first valve controls the conduction or on-off of the first flow path, the second valve controls the conduction or on-off of the second flow path, the third valve controls the conduction or on-off of the third flow path, and the fourth valve controls the conduction or on-off of the fourth flow path;

[0102] Specifically, under different current operation modes, corresponding valves are controlled to be turned on or off according to valve control instructions, so as to achieve heating the fuel while cooling the intake air when the ambient temperature is relatively high, and heating the intake gas of the gas turbine when the ambient temperature is relatively low, playing a role in preventing ice formation in the intake air, reducing additional energy consumption and cost at the same time.

[0103] For the convenience of understanding by those skilled in the art, a specific example is given below to illustrate the control method of the heat exchange system. As Figure 4 shown, taking the heat transfer medium as the coolant and the fuel as compressed natural gas as an example for illustration.

[0104] When the current operation mode is the high-temperature operation mode, after the compressed natural gas vehicle carrying compressed natural gas arrives at the operation site, the compressed natural gas from the tank is output externally through a pipeline and transferred into the first heat exchanger. There is coolant in the first heat exchanger. When the coolant is heated by the energy from the outside, it can heat the compressed natural gas. After the compressed natural gas is heated and decompressed, it is transported to the gas treatment device, and after being further processed by the gas treatment device, natural gas with appropriate temperature, pressure and cleanliness is obtained, and 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 conduct heat convection exchange between the high-temperature intake air of the gas turbine and the high-temperature flue gas discharged by the gas turbine and the low-temperature fuel caused by the decompression of the compressed natural gas through the coolant; after the heat convection exchange, the high-temperature coolant becomes the low-temperature coolant, and the low-temperature gas becomes the gas with a higher temperature.

[0105] If the third valve is turned on, the low-temperature coolant continues to circulate and flow to the second heat exchanger. The function of the second heat exchanger is to conduct heat convection exchange between the low-temperature coolant and the relatively high-temperature air (inlet gas) outside, converting the high-temperature air from the outside into low-temperature air, thereby increasing the air density, improving the air quality per unit volume, and further improving the power of the gas turbine; at this time, the second valve is turned off, and the high-temperature coolant after heat convection with the hot air flows to the first heat exchanger.

[0106] If the fourth valve is turned on, 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 emission temperature. The function of the third heat exchanger is to conduct heat convection between the discharged high-temperature flue gas and the low-temperature compressed gas formed by the first heat exchanger through the coolant. The first valve is turned on and the second valve is turned off. 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; among them, the third valve and / or the fourth valve can be turned on according to the actual situation, and no limitation is made in the embodiments of the present application.

[0107] When the current operation mode is the low-temperature operation mode, to prevent intake air icing, the intake air needs to be heated. At this time, the third valve is disconnected, the fourth valve is turned on, and the low-temperature coolant formed through the first heat exchanger flows to the third heat exchanger. The second valve is turned on. At this time, the high-temperature coolant formed after convection with the high-temperature flue gas flows through the second valve to the second heat exchanger. The coolant in the second heat exchanger heats the external cold air to prevent the high-speed air flow from icing, resulting in an increase in the intake air pressure resistance of the gas turbine or ice particles entering the gas turbine and damaging the blades of the gas turbine. After the convection with the cold air, the coolant continues to flow to the first heat exchanger to heat the low-temperature gas.

[0108] If the third valve is disconnected and the first valve and the fourth valve are turned on, the high-temperature coolant formed through the third heat exchanger can directly flow to the first heat exchanger to heat the compressed natural gas. Among them, the first valve and / or the second valve can be turned on according to the actual situation, which is not limited in the embodiments of the present application.

[0109] It should be noted that the fifth valve is disconnected during the daily work process. If the fifth valve is turned on, coolant can be timely supplemented into the pipeline.

[0110] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown according to the indication of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same moment, but can be executed at different moments. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0111] Based on the same inventive concept, the embodiments of the present application also provide a control device for implementing the control method involved above. The implementation solutions provided by this device to solve problems are similar to the implementation solutions described in the above method. Therefore, the specific limitations in one or more embodiments of the following control devices can refer to the limitations on the control method in the above text and will not be repeated here.

[0112] In an exemplary embodiment, as Figure 6 shown, a control device 600 is provided, which is applied to the above heat exchange system. The device includes:

[0113] An acquisition module 601, configured to acquire a control instruction corresponding to the current operation mode; wherein, the current operation mode is related to the ambient temperature where the heat exchange system is currently located;

[0114] A flow path control module 602 is configured to control the flow path of the heat transfer medium in the heat exchange system according to a control instruction.

[0115] 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;

[0116] The flow path control module 602 is further configured to truncate the second flow path and conduct the third flow path and / or the fourth flow path when the current operation mode is a high-temperature operation mode, and conduct the first flow path when the fourth flow path is in a conductive state;

[0117] When the current operation mode is a low-temperature operation mode, truncate the third flow path and conduct the first flow path and / or the second flow path, and conduct the fourth flow path when the first flow path is in a conductive state.

[0118] In one embodiment, the control instruction includes a valve control instruction; the flow path control module 602 is further configured to disconnect the second valve, conduct the third valve and / or the fourth valve according to the valve control instruction when the current operation mode is a high-temperature operation mode, and conduct the first valve when the fourth valve is conducted;

[0119] When the current operation mode is a low-temperature operation mode, disconnect the third valve, conduct the first valve and / or the second valve according to the valve control instruction, and conduct the fourth valve when the first valve is conducted.

[0120] Each module in the above control device can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory of the computer device in the form of software, so as to facilitate the processor to call and execute the operations corresponding to the above respective modules.

[0121] In an exemplary embodiment, a gas turbine generator set is provided. The gas turbine generator set includes a gas turbine, and an air inlet end and an exhaust end are provided on the gas turbine;

[0122] Wherein, the gas turbine generator set further includes the heat exchange system as described above.

[0123] Specifically, the gas turbine generator set further includes a gas treatment device, a gas turbine intake system, a gas turbine exhaust system, and a generator; the gas treatment device is arranged 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.

[0124] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as Figure 7 shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC), or other technologies. The computer program, when executed by the processor, implements a control method. The display unit of the computer device is used to form a visually visible picture, which may be a display screen, a projection device, or a virtual reality imaging device. The display screen may be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device may be a touch layer covered on the display screen, or a button, a trackball, or a touchpad provided on the outer shell of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0125] Those skilled in the art can understand that Figure 7 the structure shown in

[0126] is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0127] In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the above control method is implemented.

[0128] In one embodiment, a computer program product is provided, including a computer program which, when executed by a processor, implements the above control method.

[0129] 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 for analysis, stored data, displayed data, 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 relevant data need to comply with relevant regulations.

[0130] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present 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), magnetoresistive 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 be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0131] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, 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, it should be considered to be within the scope recorded in the present application.

[0132] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A heat exchange system, characterized in that: Applied to a gas turbine generator set, the gas turbine generator set includes a gas turbine, and the gas turbine is provided with an air intake end and an exhaust end; the heat exchange system includes: A first heat exchanger is arranged in the fuel pipeline of the gas turbine, and the fuel of the gas turbine enters the gas turbine through the fuel pipeline after heat exchange with the heat transfer medium in the first heat exchanger; The second heat exchanger is arranged at the air inlet end, and the inlet gas at the air inlet end enters the gas turbine after heat exchange with the heat transfer medium in the second heat exchanger, wherein 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.

2. The heat exchange system according to claim 1, characterized in that: The heat exchange system further comprises: The third heat exchanger is arranged at the exhaust end, and the outlet gas at the exhaust end performs heat exchange with the heat transfer medium in the third heat exchanger; wherein the heat transfer medium inlet of the third heat exchanger is connected to the heat transfer medium outlet of the first heat exchanger, and the heat transfer medium outlet of the third heat exchanger is respectively connected to 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 according to claim 2, characterized in that: The heat exchange system further comprises: a first valve disposed between a heat transfer medium outlet of the third heat exchanger and a heat transfer medium inlet of the first heat exchanger; a second valve disposed between a heat transfer medium outlet of the third heat exchanger and a heat transfer medium inlet of the second heat exchanger; a third valve disposed between a heat transfer medium outlet of the first heat exchanger and a heat transfer medium inlet of the second heat exchanger; A fourth valve is provided between the heat transfer medium outlet of the first heat exchanger and the heat transfer medium inlet of the third heat exchanger.

4. The heat exchange system according to any one of claims 1 to 3, characterized in that: The heat transfer medium includes a cooling fluid.

5. A control method, characterized in that: Applied to the heat exchange system according to any one of claims 1 to 4, the method comprises: Obtaining a control instruction corresponding to a current operating mode; wherein the current operating mode is related to the current ambient temperature of the heat exchange system; The flow path of the heat transfer medium in the heat exchange system is controlled according to the control instruction.

6. The method according to claim 5, characterized in that 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; The controlling the flow path of the heat transfer medium in the heat exchange system according to the control instruction comprises: When the current operation mode is the high temperature operation mode, the second flow path is cut off, and the third flow path and / or the fourth flow path are turned on, and when the fourth flow path is in the turned-on state, the first flow path is turned on; When the current operation mode is the low temperature operation mode, the third flow path is cut off, and the first flow path and / or the second flow path are turned on, and when the first flow path is in the turned-on state, the fourth flow path is turned on.

7. The method according to claim 6, characterized in that The control instruction includes a valve control instruction; and 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 the high temperature operation mode, according to the valve control instruction, the second valve is disconnected, the third valve and / or the fourth valve are turned on, and when the fourth valve is turned on, the first valve is turned on; When the current operation mode is the low temperature operation mode, the third valve is disconnected according to the valve control instruction, the first valve and / or the second valve are turned on, and when the first valve is turned on, the fourth valve is turned on.

8. A control device, characterized in that: Applicable to the heat exchange system according to any one of claims 1 to 4, the device comprising: An acquisition module, used to acquire a control instruction corresponding to a current operation mode; wherein the current operation mode is related to the current ambient temperature of the heat exchange system; The flow path control module is used to control the flow path of the heat transfer medium in the heat exchange system according to the control instruction.

9. A gas turbine generator set, characterized in that: The gas turbine generator set comprises a gas turbine, and the gas turbine is provided with an air intake end and an exhaust end; Wherein, the gas turbine generator set further comprises a heat exchange system as described in any one of claims 1 to 4.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 5 to 7 are implemented.

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