Heat recovery system and heat recovery method

Abstract

The invention relates to the field of energy, and discloses a heat recovery system and a heat recovery method.The system comprises a combustion chamber, heat taking equipment, an outer air box, heat exchange equipment and heat storage equipment; one end of the heat removal equipment is fixedly arranged on the outer wall of the combustion chamber, the other end of the heat removal equipment is fixedly arranged on the inner wall of the outer air box, and the heat removal equipment conducts heat released by the combustion chamber to the outer air box; the heat exchange equipment is fixedly arranged on the outer wall of the outer air box, the heat exchange equipment is connected with the heat storage equipment, and the heat exchange equipment stores heat of the outer air box to the heat storage equipment. And heat in the heat storage equipment can be recycled in various ways, so that the recycling applicability of heat energy is improved.

Description

Technical Field

[0001] The present application relates to the field of energy, and in particular to a heat recovery system and a heat recovery method. Background Art

[0002] As people's understanding of energy shortages continues to deepen, energy recovery and reuse has gradually become a hot spot for secondary energy. Waste heat resources have the characteristics of a wide range of sources, a wide temperature range, and various forms of existence. At present, this technology has been applied in the fields of vehicles, ships, aerospace, light and heavy industries, etc. The high-quality escape heat source generated by aircraft engines when they are working is the first choice for energy recovery resources. The temperature of the combustion chamber can reach 2300K in the take-off state, releasing about 19570KJ of heat per second. The ultra-high temperature generated cannot enter the turbine guide vane.

[0003] In the prior art, when recovering the heat generated by an aircraft engine when it is working, it is usually done by driving a thermoacoustic generator to convert the heat energy into electrical energy. However, the thermoacoustic engine itself will consume a portion of the heat when it is working, resulting in heat loss. In addition, the thermoacoustic generator can only convert heat energy into electrical energy, which limits the recovery and utilization of heat energy. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a heat recovery system and a heat recovery method to greatly reduce heat loss and improve the applicability of heat energy recovery and utilization.

[0005] To solve the above technical problems, an embodiment of the present application provides a heat recovery system, which includes: a combustion chamber, a heat extraction device, an external air box, a heat exchange device, and a heat storage device; one end of the heat extraction device is fixedly arranged on the outer wall of the combustion chamber, and the other end of the heat extraction device is fixedly arranged on the inner wall of the external air box, and the heat extraction device conducts the heat released by the combustion chamber to the external air box; the heat exchange device is fixedly arranged on the outer wall of the external air box, the heat exchange device is connected to the heat storage device, and the heat exchange device stores the heat of the external air box in the heat storage device.

[0006] An embodiment of the present application also provides a heat recovery system, in which the heat extraction device is: a special-shaped heat pipe heat collector; the evaporation end of the special-shaped heat pipe heat collector is one end of the heat extraction device, which is attached to the outer wall of the combustion chamber; the condensation end of the special-shaped heat pipe heat collector is the other end of the heat extraction device, which is attached to the inner wall of the external air box; the heat released by the combustion chamber during operation evaporates the liquid working medium in the evaporation end to form gas, and the gas passes through the insulation section of the special-shaped heat pipe heat collector to the condensation end, and is conducted to the external air casing.

[0007] The embodiment of the present application further provides a heat recovery system, wherein both ends of the special-shaped heat pipe heat collector are arc-shaped elbows.

[0008] An embodiment of the present application also provides a heat recovery system, wherein the heat exchange equipment includes: a spiral tube heat exchanger and a constant temperature working fluid box; the spiral tube heat exchanger is wound and adhered to the outer wall of the outer air box; the input end of the spiral tube heat exchanger is connected to the output end of the constant temperature working fluid box, the output end of the spiral tube heat exchanger is connected to the input end of the heat storage device, and the output end of the heat storage device is connected to the input end of the constant temperature working fluid box; the constant temperature working fluid box transports the working fluid to the spiral tube heat exchanger, and the spiral tube heat exchanger brings the heat of the outer air box into the heat storage device through the flow of the working fluid; after the heat storage device stores heat, the working fluid is transported to the constant temperature working fluid box.

[0009] An embodiment of the present application further provides a heat recovery system, wherein the spiral tube heat exchanger is a spiral flat tube heat exchanger.

[0010] An embodiment of the present application also provides a heat recovery system, which also includes: a driving pump, a first regulating valve, a second regulating valve, a first switch valve, and a second switch valve; the input end of the spiral tube heat exchanger is connected to the driving pump, the driving pump is connected to the first regulating valve, the first regulating valve is connected to the first switch valve, and the first switch valve is connected to the output end of the constant temperature working fluid box; the output end of the heat storage device is connected to the second switch valve, the second switch valve is connected to the second regulating valve, and the second regulating valve is connected to the input end of the constant temperature working fluid box.

[0011] An embodiment of the present application also provides a heat recovery system, wherein the driving pump, the first regulating valve, the first switch valve, the second switch valve, and the second regulating valve are all connected to a control device; the control device controls the states of the driving pump, the first regulating valve, the first switch valve, the second switch valve, and the second regulating valve according to heat utilization requirements.

[0012] An embodiment of the present application also provides a heat recovery method, which is applied to any of the heat recovery systems described above, and the method includes: a heat extraction device in the heat recovery system transfers the heat released by the combustion chamber in the heat recovery system to an external air box in the heat recovery system; a heat exchange device in the heat recovery system stores the heat of the external air box in a heat storage device in the heat recovery system.

[0013] An embodiment of the present application also provides a heat recovery method, wherein the heat extraction device is: a special-shaped heat pipe heat extractor; a method for determining the structure of the special-shaped heat pipe heat extractor comprises: determining the special-shaped heat pipe heat extractor of a target structure from the test special-shaped heat pipe heat extractors of different structures according to the temperature distribution, flow pattern distribution, startup characteristics, and heat transfer characteristics of the test special-shaped heat pipe heat extractors of different structures during operation.

[0014] An embodiment of the present application also provides a heat recovery method, and the method for determining the number of the special-shaped heat pipe heat exchangers includes: determining the number of the special-shaped heat pipe heat exchangers based at least on the structure of the special-shaped heat pipe heat exchangers, the surface area of ​​the combustion chamber, and the thrust requirement of the equipment where the combustion chamber is located.

[0015] In the present application, the heat extraction device conducts the heat released by the combustion chamber to the external air box, and the heat exchange device stores the heat of the external air box in the heat storage device. The heat extraction device extracts heat from between the external air box and the combustion chamber, and can fully obtain the heat generated by the combustion chamber. The heat exchange device does not need to convert the heat when storing heat, which can greatly reduce the heat loss. Moreover, by storing the heat in the heat storage device, the stored heat can be reused in multiple ways, thereby improving the applicability of heat energy recovery and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by the pictures in the corresponding drawings, and these exemplary descriptions do not constitute limitations on the embodiments.

[0017] Figure 1 is a structural schematic diagram of a first heat recovery system provided in an embodiment of the present application;

[0018] Figure 2 is a structural schematic diagram of a second heat recovery system provided in an embodiment of the present application;

[0019] Figure 3 is a structural schematic diagram of a third heat recovery system provided in an embodiment of the present application;

[0020] Figure 4 It is a structural schematic diagram of a special-shaped heat pipe heat collector provided in an embodiment of the present application;

[0021] Figure 5 is a structural schematic diagram of a fourth heat recovery system provided in an embodiment of the present application;

[0022] Figure 6 is a structural schematic diagram of a fifth heat recovery system provided in an embodiment of the present application;

[0023] Figure 7 is a structural schematic diagram of a sixth heat recovery system provided in an embodiment of the present application;

[0024] Figure 8 is a structural schematic diagram of a seventh heat recovery system provided in an embodiment of the present application;

[0025] Fig. 9 is a structural schematic diagram of an eighth heat recovery system provided in an embodiment of the present application;

[0026] Fig.10 It is a schematic flow chart of a heat recovery method provided in an embodiment of the present application;

[0027] Fig.11 It is a structural diagram of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. However, it will be appreciated by those skilled in the art that in the present application, many technical details are proposed in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is for the convenience of description, and the specific implementation of the present application should not be construed as any limitation, and the various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0029] The embodiment of the present application relates to a heat recovery system. Figure 1 is a schematic diagram of the structure of the first heat recovery system provided in the embodiment of the present application, such as Figure 1 As shown, the heat recovery system includes: a combustion chamber 10, a heat extraction device 20, an external air box 30, a heat exchange device 40, and a heat storage device 50.

[0030] One end of the heat extraction device 20 is fixedly disposed on the outer wall of the combustion chamber 10 .

[0031] The combustion chamber 10 is where the fuel burns, and heat is released through chemical reactions during operation. The heat of the combustion chamber 10 is transferred to the outer wall of the combustion chamber 10. A heat extraction device 20 is fixedly provided on the outer wall of the combustion chamber 10, and the heat extraction device 20 can collect the heat of the outer wall of the combustion chamber 10.

[0032] Optionally, the combustion chamber 10 may be an aircraft engine combustion chamber, or other combustion chambers. When it is an aircraft engine combustion chamber, it may specifically be an aircraft engine annular combustion chamber, etc., which is not specifically limited in the embodiments of the present application.

[0033] The other end of the heat extraction device 20 is fixedly mounted on the inner wall of the outer air box 30. In the basic technology, the outer air box 30 of the combustion chamber of the aircraft engine is a key component, which is mainly used to guide and manage the air flow entering the combustion chamber 10, and provide the necessary oxygen for fuel combustion. By optimizing the air flow and distribution, the outer air box 30 can improve the performance and responsiveness of the engine, ensure more complete combustion, thereby increasing thrust and reducing emissions. In the embodiment of the present application, the heat extraction device 20 conducts the heat released by the combustion chamber 10 to the outer air box 30.

[0034] The heat extracting device 20 collects the heat released by the combustion chamber through one end, and conducts the collected heat to the external air box 30 through the other end. Specifically, the conduction is heat conduction.

[0035] The heat exchange device 40 is fixedly disposed on the outer wall of the external air box 30 . The heat exchange device 40 is connected to the heat storage device 50 . The heat exchange device 40 stores the heat of the external air box 30 in the heat storage device 50 .

[0036] The heat exchange device 40 is a device for heat transfer, and its main function is to transfer heat through a fluid (such as liquid or gas). The heat storage device 50 is used to store heat so as to release it when needed.

[0037] The outer air box 30 has heat conducted by the heat extraction device 20. The heat exchange device 40 is fixedly arranged on the outer wall of the outer air box 30 and can absorb the heat on the outer air box 30 through the internal working medium (such as fluid). Then, through the flow of the internal working medium, the internal working medium flows to the heat storage device 50, and the heat on the outer air box 30 is sent to the heat storage device 50 to complete the heat exchange.

[0038] In the embodiment of the present application, the heat extraction device conducts the heat released by the combustion chamber to the external air box, and the heat exchange device stores the heat of the external air box in the heat storage device. The heat recovery system can effectively recover the heat of the combustion chamber. The heat extraction device extracts heat from the external air box and the combustion chamber, and can fully obtain the heat generated by the combustion chamber. The heat exchange device does not need to convert the heat when storing heat, which can greatly reduce the loss of heat. Moreover, by storing the heat in the heat storage device, the stored heat can be reused in various ways, thereby improving the applicability of heat energy recovery. The entire system can be directly applied to real environments and can be widely used for heat recovery in combustion chambers, and has strong practicality.

[0039] In the above Figure 1 Based on the structural schematic diagram of a heat recovery system shown in FIG. 1 , an embodiment of the present application further provides another heat recovery system. Figure 2 is a schematic diagram of the structure of a second heat recovery system provided in an embodiment of the present application, such as Figure 2As shown, the heat extraction device 20 is a special-shaped heat pipe heat extractor.

[0040] Among them, the special-shaped heat pipe heat collector can also be called a special-shaped heat pipe heat exchanger, a special-shaped heat pipe, etc., which is not specifically limited in the embodiments of the present application.

[0041] The evaporation end of the special-shaped heat pipe heat exchanger is one end of the heat extraction device 20 , which is attached to the outer wall of the combustion chamber 10 ; the condensation end of the special-shaped heat pipe heat exchanger is the other end of the heat extraction device 20 , which is attached to the inner wall of the outer air box 30 .

[0042] The heat released by the combustion chamber 10 during operation evaporates the liquid working medium in the evaporation end of the special-shaped heat pipe heat exchanger to form gas, and the gas passes through the insulation section of the special-shaped heat pipe heat exchanger to the condensation end, and is further conducted to the external air casing 30.

[0043] The inside of the heat pipe heat exchanger is evacuated to a certain negative pressure, so that the liquid working medium inside the heat pipe heat exchanger is filled with the porous material of the liquid absorption core. The outer wall of the combustion chamber of the aircraft engine is closely attached to the heat transfer surface of the evaporation end of the heat pipe heat exchanger, and the heat enters the evaporation end from the heat absorption surface of the heat pipe heat exchanger. The liquid working medium at the heat receiving end (evaporation end) absorbs heat and evaporates. The vapor working medium flows from the steam chamber (insulation section) to the condensation end through the pressure difference in the tube and releases heat to liquefy. Then, it flows back to the evaporation end through the capillary force of the porous material itself, and the heat transfer is completed in a cycle.

[0044] Optionally, the special-shaped heat pipe heat collector is a fully enclosed device with no holes on the surface. Of course, it can also be other structures, which are not specifically limited in the embodiments of the present application.

[0045] Among them, the surface of the special-shaped heat pipe heat exchanger has an insulation layer, and the insulation layer is used to wrap the outer wall of the combustion chamber 10 and the surface structure of the special-shaped heat pipe heat exchanger, leaving only the contact surface between the special-shaped heat pipe heat exchanger and the combustion chamber 10 to prevent the airflow from taking away heat by convection.

[0046] In the embodiment of the present application, the special-shaped heat pipe heat collector collects the heat from the combustion chamber and conducts it to the external air box through the evaporation end, the insulation section, and the condensation end. The evaporation end of each special-shaped heat pipe heat collector fits tightly against the outer wall of the combustion chamber, and the condensation end fits tightly against the inner wall of the external air box to fully obtain and conduct the heat generated by the combustion chamber.

[0047] In the above Figure 2 Based on the structural schematic diagram of a heat recovery system shown in FIG. 1 , an embodiment of the present application further provides another heat recovery system. Figure 3 is a schematic diagram of the structure of a third heat recovery system provided in an embodiment of the present application, Figure 4 is a schematic diagram of the structure of a special-shaped heat pipe heat collector provided in an embodiment of the present application, such as Figure 3 and Figure 4 As shown, the two ends of the special-shaped heat pipe heat exchanger are arc-shaped elbows. The special-shaped heat pipe heat exchanger consists of three parts: an arc-shaped evaporation end, an arc-shaped condensation end and a straight insulation section.

[0048] In the aviation field, when the combustion chamber 10 is an annular combustion chamber of an aircraft engine, the cross section of the combustion chamber 10 is circular, and the corresponding cross section of the outer air box 30 is also circular ( Figure 3 The outer air casing of an aircraft engine in the figure), there is a secondary air flow channel between the combustion chamber 10 and the outer air casing 30, and a special-shaped heat pipe heat exchanger is arranged in the secondary air flow channel. At this time, both ends of the special-shaped heat pipe heat exchanger are arc-shaped elbows to closely fit the outer wall of the combustion chamber 10 and the inner wall of the outer air casing 30.

[0049] The two ends of the special-shaped heat pipe heat exchanger are changed into arc-shaped elbows, so that the evaporation end and condensation end of the special-shaped heat pipe heat exchanger are closely fitted with the wall surface of the secondary air flow channel (the evaporation end of the special-shaped heat pipe is closely fitted with the outer wall surface of the combustion chamber, and the condensation end of the special-shaped heat pipe is closely fitted with the inner wall surface of the outer air casing). By modifying the evaporation end and condensation end of the conventional straight heat pipe, it can be closely fitted with the outer wall surface of the combustion chamber 10 and the inner wall surface of the outer air casing 30, completing the heat transfer process from the combustion chamber 10 to the outer air casing 30.

[0050] Figure 5 is a schematic diagram of the structure of the fourth heat recovery system provided in the embodiment of the present application, such as Figure 5 As shown, there are usually multiple special-shaped heat pipe heat collectors.

[0051] The aircraft engine is equipped with an exhaust device. When the combustion chamber 10 is working, a large amount of fuel provided by the fuel nozzle and a large volume of air provided by the compressor are burned together to release heat, allowing the air to expand and accelerate so as to provide the turbine gas flow in all conditions. The engine then discharges the gas exhausted by the turbine into the atmosphere at a certain speed and in a required direction to provide thrust.

[0052] The temperature of the gas released by the combustion chamber 10 when it is working is about 1800 to 2000°C, which is too high to enter the turbine guide vane. A plurality of special-shaped heat pipe heat collectors are arranged axially at the secondary air flow channel to fully obtain the escape heat generated by the combustion chamber 10.

[0053] Among them, part of the heat generated by the combustion chamber 10 is indeed used to generate thrust (the engine generates high-temperature and high-pressure gases by burning fuel. These gases are quickly discharged, and according to Newton's third law, the reaction force generated enables rockets and other equipment to obtain thrust), and the other part is called escape heat (in the combustion process, although most of the heat is used to propel the gas, some heat still escapes in the form of thermal radiation or the failure of the gas to be completely converted into kinetic energy).

[0054] In the embodiment of the present application, both ends of the special-shaped heat pipe heat exchanger are arc-shaped elbows to closely fit the outer wall of the combustion chamber and the inner wall of the external air box to fully obtain and conduct the escape heat generated by the combustion chamber.

[0055] In the above Figure 1 Based on the structural schematic diagram of a heat recovery system shown in FIG. 1 , an embodiment of the present application further provides another heat recovery system. Figure 6 is a structural schematic diagram of a fifth heat recovery system provided in an embodiment of the present application, such as Figure 6 As shown, the heat exchange device 40 includes: a spiral tube heat exchanger 41 and a constant temperature working medium box 42.

[0056] Figure 7 is a structural schematic diagram of a sixth heat recovery system provided in an embodiment of the present application, such as Figure 7 As shown, the spiral tube heat exchanger 41 is wound and attached to the outer wall of the outer air box 30. In view of the cylindrical structure of the outer duct of the aircraft engine, the heat transmitted to the outer duct wall by the special-shaped heat pipe heat collector is recovered by a spiral tube heat exchanger.

[0057] The design of the spiral tube allows the working fluid to form a vortex when flowing in the tube. The spiral shape can also increase the heat exchange area within a limited space and improve the heat exchange efficiency.

[0058] The input end of the spiral tube heat exchanger 41 is connected to the output end of the constant temperature working medium box 42. The constant temperature working medium box 42 can transport the constant temperature working medium inside to the spiral tube heat exchanger 41, so that the spiral tube heat exchanger 41 realizes heat flow through the working medium flow. Among them, the main reason for using the constant temperature working medium in the heat exchanger is to improve the heat exchange efficiency and ensure the effective transfer of heat.

[0059] The output end of the spiral tube heat exchanger 41 is connected to the input end of the heat storage device 50 , and the spiral tube heat exchanger 41 brings the heat of the external air box 30 into the heat storage device 50 through the flow of the working medium.

[0060] In the spiral tube heat exchanger 41, the external air box 30 exchanges heat with the fluid in the heat exchange pipe of the spiral tube heat exchanger 41 through the heat transfer medium. The heat is transferred to the working medium flowing through the spiral tube through the tube wall. The working medium flows in the spiral tube at a certain flow rate, forming a vortex effect, increasing the heat exchange area, and the flowing working medium carries the heat to the heat storage device 50.

[0061] Optionally, the heat storage device 50 uses high heat capacity materials (such as water, rock or specific phase change materials) to store thermal energy, which absorb heat when heated and release it when needed later. The heat storage device 50 can also be called a heat storage box, etc., which is not specifically limited in the embodiments of the present application.

[0062] The output end of the heat storage device 50 is connected to the input end of the constant temperature working fluid box 42. After the heat storage device 50 stores heat, it delivers the working fluid to the constant temperature working fluid box 42. The working fluid absorbs heat in the spiral tube heat exchanger 41, and the temperature and energy level increase. After the heat storage device 50 absorbs the heat of the working fluid, the temperature of the working fluid decreases, the energy decreases, and the low-energy, low-temperature and low-energy working fluid is input into the constant temperature working fluid box 42. In the constant temperature working fluid box 42, the temperature of the working fluid is further controlled to ensure that the output working fluid can continue to be used for heat exchange in the spiral tube heat exchanger 41.

[0063] In an embodiment of the present application, the heat exchange equipment includes a spiral tube heat exchanger and a constant temperature working fluid box. The heat exchange efficiency can be improved by using the spiral tube heat exchanger. The working fluid in the constant temperature working fluid box is input into the spiral tube heat exchanger to achieve heat exchange. Moreover, the working fluid in the constant temperature working fluid box can be recycled to reduce costs.

[0064] In the above Figure 6 Based on the structural schematic diagram of a heat recovery system shown in FIG. 1 , an embodiment of the present application further provides another heat recovery system. Figure 8 is a structural schematic diagram of a seventh heat recovery system provided in an embodiment of the present application, such as Figure 8 As shown, the spiral tube heat exchanger is a spiral flat tube heat exchanger.

[0065] Since the spiral tube heat exchanger is installed on the outer surface of the external air box 30, in order to overcome the complex working environment and minimize the interference with the external airflow, the existing spiral round tube is pressed into a flat tube with a certain thickness that can fit tightly on the duct surface of the external machine.

[0066] The outer air box 30 is wrapped with a heat preservation layer, leaving only the surface in contact with the spiral flat tube heat exchanger to prevent heat loss. At the same time, a heat storage device 50 and a working fluid pump (constant temperature working fluid box 42) are installed at the tail end of the outer air box 30. The working fluid pump drives the organic working fluid to be input from one end of the spiral tube. After continuous pressurization, the liquid working fluid flows along the spiral tube structure and then flows into the heat storage device 50 to complete the heat exchange.

[0067] In the embodiment of the present application, the circular tube is flattened to increase the contact area with the heat source surface (external air box), to facilitate fitting to the outer wall surface of the external air box, and to reduce disturbance to the airflow.

[0068] In the above Figure 6 Based on the structural schematic diagram of a heat recovery system shown in FIG. 1 , an embodiment of the present application further provides another heat recovery system. Fig. 9 is a schematic diagram of the structure of the eighth heat recovery system provided in the embodiment of the present application. Fig. 9 As shown, the heat recovery system further includes: a driving pump 60 , a first regulating valve 71 , a second regulating valve 72 , a first switch valve 81 , and a second switch valve 82 .

[0069] The input end of the spiral tube heat exchanger 41 is connected to the driving pump 60 , the driving pump 60 is connected to the first regulating valve 71 , the first regulating valve 71 is connected to the first switch valve 81 , and the first switch valve 81 is connected to the output end of the constant temperature working medium box 42 .

[0070] Among them, the first switch valve 81 is used to completely open or close the working fluid channel between the constant temperature working fluid box 42 and the spiral tube heat exchanger 41. The first regulating valve 71 can adjust the flow rate of the working fluid flowing in the working fluid channel between the constant temperature working fluid box 42 and the spiral tube heat exchanger 41. The flow rate of the working fluid is mainly accurately controlled by adjusting the opening size of the regulating valve. The driving pump 60 is mainly used to drive the flow of the working fluid to transport the working fluid from the output end of the constant temperature working fluid box 42 to the input end of the spiral tube heat exchanger 41.

[0071] The output end of the heat storage device 50 is connected to the second switch valve 82 , the second switch valve 82 is connected to the second regulating valve 72 , and the second regulating valve 72 is connected to the input end of the constant temperature working medium box 42 .

[0072] Among them, the second regulating valve 72 can adjust the flow rate of the working fluid flowing in the working fluid channel between the constant temperature working fluid box 42 and the heat storage device 50, and the second switch valve 82 is used to completely open or close the working fluid channel between the constant temperature working fluid box 42 and the heat storage device 50.

[0073] In the embodiment of the present application, the flow of the working fluid can be controlled by driving a pump, a regulating valve, and a switch valve to perform reasonable heat exchange.

[0074] In the above Fig. 9 Based on the structural schematic diagram of a heat recovery system shown, an embodiment of the present application also provides another heat recovery system, in which a driving pump 60, a first regulating valve 71, a second regulating valve 72, a first switch valve 81, and a second switch valve 82 are all connected to a control device.

[0075] Among them, the control device can be any computer device including a processor and a memory, and is not specifically limited in the embodiments of the present application.

[0076] The control device controls the states of the driving pump 60 , the first regulating valve 71 , the first opening and closing valve 81 , the second opening and closing valve 82 , and the second regulating valve 72 according to the heat utilization demand.

[0077] Optionally, for the spiral tube heat exchanger, since the aircraft engine is divided into take-off, cruising and landing states, the heat released by the combustion chamber 10 is different, and the corresponding working fluid flow and temperature can be adjusted through the driving pump 60, the first regulating valve 71 and the first switch valve 81 on the working fluid pump pipeline to achieve reasonable heat exchange.

[0078] Among them, heat utilization needs include but are not limited to: cabin temperature control needs, defrosting and de-icing needs, electrical system heating needs, and engine waste heat can also be used to heat the cabin or provide heat for other systems, thereby reducing fuel consumption and emissions.

[0079] The control device receives real-time data from temperature and pressure sensors, etc., and evaluates the current heat utilization demand. If the heat utilization demand increases, the control device starts or accelerates the drive pump to ensure that the working fluid flow meets the demand; otherwise, the pump speed is reduced or the pump is turned off; the control device adjusts the opening of the regulating valve according to the flow demand to accurately control the fluid flow and pressure to ensure stable operation of the system; when there is no heat utilization demand, or when it is necessary to switch the fluid path or isolate part of the system, the control device issues a command to open or close the switch valve to ensure the safety and efficiency of the fluid flow. Through this series of precise adjustments, the controller can achieve efficient management of the working fluid flow and optimize heat utilization.

[0080] In the embodiment of the present application, the control device controls the driving pump, regulating valve, and switching valve according to the heat utilization demand to meet the heat demand, and the required heat can be reused.

[0081] Above Figure 1-Figure 9 In the heat recovery system shown, after the spiral tube heat exchanger and the special-shaped heat pipe (special-shaped heat pipe heat collector) at the corresponding position are installed, the evaporation end of the special-shaped heat pipe fits tightly with the outer wall of the combustion chamber, and the condensation end of the special-shaped heat pipe fits tightly with the inner wall of the outer air casing (outer air casing). The heat released by the combustion chamber during operation can evaporate the liquid working medium in the evaporation end of the special-shaped heat pipe to form gas. The gas passes through the adiabatic section to the condensation end and is conducted to the outer air casing. The spiral tube heat exchanger on the outer air casing brings the heat into the heat storage box (heat storage equipment) through the flow of the working medium, completing the heat exchange from the outer air casing to the heat storage box. At the same time, the gas at the condensation end of the special-shaped heat pipe is liquefied and returns to the evaporation end, and the gas-liquid exchange is carried out in sequence to complete the heat exchange from the combustion chamber to the outer air casing, that is, the heat source recovery requirements for the annular combustion chamber structure of the aircraft engine are realized.

[0082] The heat recovery system can be a heat recovery system for the annular combustion chamber of an aircraft engine. A complete energy recovery system is formed by reasonably arranging special-shaped heat pipe elements (special-shaped heat pipe heat collectors) between secondary airflow channels, arranging a spiral flat heat pipe heat exchanger and an energy recovery device of a heat storage box on the outer air casing, and setting the fluid on the outer air casing. For the special-shaped heat pipes in the above-mentioned heat recovery system, the evaporation end and condensation end of the conventional straight heat pipe are modified so that they can fit closely to the outer wall of the combustion chamber and the inner wall of the outer air casing, thereby completing the heat transfer process from the combustion chamber to the outer air casing; wherein CFD simulation of the internal fluid of the special-shaped heat pipe is performed, and the best heat transfer effect of the special-shaped heat pipe is achieved by optimizing the structure of the evaporation end and condensation end of the special-shaped heat pipe; for the spiral flat heat pipe in the above-mentioned heat recovery system, the circular tube is flattened to increase the contact area with the heat source surface, which is convenient for fitting to the outer casing wall surface and reduces the disturbance to the airflow; for the heat storage device in the above-mentioned heat recovery system, it is arranged on the outer casing, and the working fluid flow in the spiral flat tube heat exchanger is driven by a working fluid pump to send the heat on the outer casing surface to the heat storage device to complete the heat exchange.

[0083] The heat recovery system can effectively recover the heat source escaping from the combustion chamber of an aircraft engine by rationally designing and arranging special-shaped heat pipes, spiral flat tube heat exchangers and their drivers (driving pumps), and storage devices (heat storage equipment). While solving the problem of excessively high combustion chamber temperature requiring cooling, it also achieves the reuse of high-quality heat sources generated by aircraft engines at work, improves the overall utilization rate of energy, and can be widely used in heat recovery of aircraft engines in annular combustion chambers, with strong applicability.

[0084] Based on the structural diagram of the above heat recovery system, the embodiment of the present application further provides a heat recovery method. Fig.10 is a schematic diagram of a heat recovery method provided in an embodiment of the present application, such as Fig.10 As shown, the heat recovery method is applied to the heat recovery system in any one of the above embodiments. The heat recovery method includes the following steps.

[0085] Step 101, a heat extraction device in a heat recovery system transfers heat released by a combustion chamber in the heat recovery system to an external air box in the heat recovery system.

[0086] The heat recovery system includes: a heat extraction device, a combustion chamber, and an external air box. The heat extraction device transfers the heat released by the combustion chamber to the external air box.

[0087] The combustion chamber generates heat by burning fuel, which can be used to heat air or fluid to meet the heat demand of the system. The heat extraction device transfers the heat generated in the combustion chamber to another medium. The heat can be transferred from the combustion gas to the external air box through the heat extraction device by conduction and convection.

[0088] Step 102: The heat exchange device in the heat recovery system stores the heat of the outdoor air box into the heat storage device in the heat recovery system.

[0089] The heat recovery system also includes: a heat exchange device and a heat storage device. The heat exchange device stores the heat of the outdoor air box in the heat storage device.

[0090] The main function of the heat exchanger is to effectively transfer the heat from the outside air box to the thermal storage device. This is usually achieved by heat exchange, ensuring that the heat of the air is effectively transferred to the thermal storage material. Thermal storage devices, such as thermal storage tanks or thermal storage bodies, are able to store heat when there is sufficient heat, usually using materials with high heat capacity to retain the stored heat and release it when needed.

[0091] By storing the heat from the outdoor air box in the thermal storage device, different heat demands can be responded to more flexibly. During peak heat demand periods, the thermal storage device can provide additional heat, while during low demand periods, the excess heat can be stored to avoid energy waste. It can also balance the system's heat supply and demand, ensuring stable temperature and heat supply in different time periods, and improving overall operating efficiency.

[0092] In the embodiment of the present application, the heat exchange device does not need to convert the heat when storing heat, which can greatly reduce the heat loss. In addition, the heat can be stored in the heat storage device, and the stored heat can be reused in multiple ways to improve the applicability of heat energy recycling. At the same time, the heat storage device stores excess heat when demand is low, which can be released when demand is high, balancing the system load and improving the flexibility and response speed of heating.

[0093] In the above Fig.10 Based on the flow diagram of a heat recovery method shown, an embodiment of the present application also provides another heat recovery method, and the heat extraction device in the above step 101 is: a special-shaped heat pipe heat extractor.

[0094] The method for determining the structure of a special-shaped heat pipe heat exchanger includes: determining a special-shaped heat pipe heat exchanger of a target structure from the test special-shaped heat pipe heat exchangers of different structures according to the temperature distribution, flow pattern distribution, startup characteristics, and heat transfer characteristics of the test special-shaped heat pipe heat exchangers of different structures during operation.

[0095] In the embodiment of the present application, for the special-shaped heat pipe heat collector, CFD (Computational Fluid Dynamics) fluid simulation software is used to start from the four aspects of temperature distribution, flow pattern distribution, startup characteristics, and heat transfer characteristics, and compare the heat transfer performance of the special-shaped heat pipe at the connection between the steam chamber and the liquid absorption core under different curvatures to determine the special-shaped heat pipe with the best structure and the best heat transfer effect. However, for different cylinder diameters, it is necessary to redetermine the length of the heat pipe evaporation end, condensation end, insulation section and the curvature of the connection.

[0096] Optionally, use CAD (Computer-Aided Design) software to design special-shaped heat pipes at the connection between the steam chamber and the wick at different curvatures, perform meshing in the CFD software, and select appropriate mesh density and type; run simulation in the CFD software to obtain temperature distribution and flow field distribution diagrams, and use visualization tools in the software to analyze the temperature field and velocity field at different curvatures, observe the flow pattern, observe the temperature change and pressure change of the heat pipe from startup to stable working state, evaluate its startup performance, calculate the thermal resistance and heat transfer coefficient of the heat pipe, compare the heat transfer characteristics of different designs, organize the heat transfer performance data at the connection between the steam chamber and the wick at different curvatures, conduct comparative analysis, and determine the optimal special-shaped heat pipe structure based on a comprehensive evaluation of temperature distribution, flow pattern distribution, startup characteristics, and heat transfer characteristics.

[0097] Optionally, analyze the relationship between the heat transfer characteristics and diameter of the evaporation end, condensation end and insulation section of the special-shaped heat pipe heat collector. A larger diameter may affect the flow and heat exchange efficiency of the fluid. According to the change in diameter, use the proportional relationship to adjust the length of the evaporation end, condensation end and insulation section. Usually, the length of the evaporation end and condensation end can be calculated according to the required heat transfer capacity and the properties of the working fluid; the curvature of the connection should consider the flow characteristics of the fluid, reduce flow resistance and optimize the flow direction. Arcs or other curved shapes can be used; establish a new geometric model, use CFD software to simulate the fluid of heat pipes of different diameters, evaluate the heat flow, temperature distribution and flow characteristics of each part, and adjust the length and bending radius of each section according to the simulation results to optimize the fluid flow and heat exchange effect.

[0098] In the embodiment of the present application, based on the comprehensive evaluation of temperature distribution, flow pattern distribution, startup characteristics and heat transfer characteristics, the optimal special-shaped heat pipe heat exchanger is determined to improve the heat extraction and heat transfer performance of the special-shaped heat pipe heat exchanger.

[0099] Based on the flow diagram of a heat recovery method in the above embodiment, an embodiment of the present application also provides another heat recovery method. The method for determining the number of special-shaped heat pipe heat exchangers in the above embodiment includes: determining the number of special-shaped heat pipe heat exchangers based at least on the structure of the special-shaped heat pipe heat exchanger, the surface area of ​​the combustion chamber, and the thrust requirement of the equipment where the combustion chamber is located.

[0100] In an embodiment of the present application, the thrust required for the device is determined by the working conditions and application requirements of the device, and the effective surface area of ​​the combustion chamber is measured or calculated; the heat load per unit area is calculated based on the operating conditions (such as fuel type, combustion efficiency, etc.) and surface area of ​​the combustion chamber; the maximum heat transfer capacity of a single special-shaped heat pipe heat collector under specific working conditions is determined by the structure, material, working fluid, and effective length and diameter of the special-shaped heat pipe; the escape heat is determined based on the thrust and heat load, and the required number of special-shaped heat pipe heat collectors is determined based on the escape heat and the thermal properties of the special-shaped heat pipe.

[0101] Optionally, the layout of the special-shaped heat pipe heat collector needs to ensure the rationality of the installation space and that the heat transfer between the special-shaped heat pipes does not interfere with each other.

[0102] In the embodiment of the present application, the number of special-shaped heat pipe heat exchangers is determined based on at least the structure of the special-shaped heat pipe heat exchangers, the surface area of ​​the combustion chamber, and the thrust requirement of the equipment where the combustion chamber is located, ensuring that the heat generated by the combustion chamber not only meets the thrust requirement of the equipment, but also can fully obtain the escape heat for recovery.

[0103] The heat recovery method provided in the present application can be a new type of waste heat recovery method for the annular combustion chamber structure of an aircraft engine. It can not only solve the cooling problem of the ultra-high temperature state caused by the aircraft engine in the take-off state, but also realize the cascade utilization of the escape heat source. It has strong practicality and can be widely used in the annular combustion chamber structure of an aircraft engine.

[0104] The step division of the above methods is only for the purpose of clear description. When implemented, they can be combined into one step or some steps can be split and decomposed into multiple steps. As long as they include the same logical relationship, they are all within the scope of protection of this patent; adding insignificant modifications to the algorithm or process or introducing insignificant designs without changing the core design of the algorithm and process are all within the scope of protection of this patent.

[0105] The present application embodiment relates to a computer device, Fig.11 is a schematic diagram of the structure of a computer device provided in an embodiment of the present application, such as Fig.11As shown, it includes: at least one processor 1101; and a memory 1102 that is communicatively connected to the at least one processor 1101; wherein the memory 1102 stores instructions that can be executed by the at least one processor 1101, and the instructions are executed by the at least one processor 1101 so that the at least one processor 1101 can execute the method for determining the structure of the type heat pipe heat exchanger and the method for determining the number of special-shaped heat pipe heat exchangers in the above-mentioned method embodiment.

[0106] The memory and the processor are connected in a bus manner. The bus may include any number of interconnected buses and bridges. The bus connects various circuits of one or more processors and memories together.

[0107] The present application embodiment relates to a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the method for determining the structure of the heat pipe heat exchanger and the method for determining the number of the special-shaped heat pipe heat exchangers in the above method embodiment are implemented.

[0108] That is, those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0109] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. A heat recovery system, characterized in that: The system includes: a combustion chamber, a heat extraction device, an external air box, a heat exchange device, and a heat storage device; One end of the heat extraction device is fixedly arranged on the outer wall of the combustion chamber, and the other end of the heat extraction device is fixedly arranged on the inner wall of the outer air box, and the heat extraction device conducts the heat released by the combustion chamber to the outer air box; The heat exchange device is fixedly arranged on the outer wall of the external air box, the heat exchange device is connected to the heat storage device, and the heat exchange device stores the heat of the external air box in the heat storage device.

2. The heat recovery system according to claim 1, characterized in that: The heat extraction equipment is: a special-shaped heat pipe heat extractor; The evaporation end of the special-shaped heat pipe heat exchanger is one end of the heat extraction device, which is attached to the outer wall of the combustion chamber; The condensing end of the special-shaped heat pipe heat exchanger is the other end of the heat extraction device, which is attached to the inner wall of the outer air box; The heat released by the combustion chamber during operation evaporates the liquid working medium in the evaporation end to form gas, and the gas passes through the insulation section of the special-shaped heat pipe heat collector to the condensation end and is conducted to the external air casing.

3. The heat recovery system according to claim 2, characterized in that: Both ends of the special-shaped heat pipe heat collector are arc-shaped elbows.

4. The heat recovery system according to claim 1, characterized in that: The heat exchange equipment includes: a spiral tube heat exchanger and a constant temperature working medium box; The spiral tube heat exchanger is wound and attached to the outer wall of the outer air box; The input end of the spiral tube heat exchanger is connected to the output end of the constant temperature working medium box, the output end of the spiral tube heat exchanger is connected to the input end of the heat storage device, and the output end of the heat storage device is connected to the input end of the constant temperature working medium box; The constant temperature working medium box transports the working medium to the spiral tube heat exchanger, and the spiral tube heat exchanger brings the heat of the external air box into the heat storage device through the flow of the working medium; after the heat storage device stores heat, it transports the working medium to the constant temperature working medium box.

5. The heat recovery system according to claim 4, characterized in that: The spiral tube heat exchanger is a spiral flat tube heat exchanger.

6. The heat recovery system according to claim 4, characterized in that: The system further comprises: a driving pump, a first regulating valve, a second regulating valve, a first switch valve, and a second switch valve; The input end of the spiral tube heat exchanger is connected to the driving pump, the driving pump is connected to the first regulating valve, the first regulating valve is connected to the first switch valve, and the first switch valve is connected to the output end of the constant temperature working medium box; The output end of the heat storage device is connected to the second switch valve, the second switch valve is connected to the second regulating valve, and the second regulating valve is connected to the input end of the constant temperature working medium box.

7. The heat recovery system according to claim 6, characterized in that: The driving pump, the first regulating valve, the first switch valve, the second switch valve, and the second regulating valve are all connected to a control device; The control device controls the states of the driving pump, the first regulating valve, the first switching valve, the second switching valve, and the second regulating valve according to heat utilization requirements.

8. A heat recovery method, characterized in that: Applied to the heat recovery system of any one of claims 1 to 7, the method comprising: The heat extraction device in the heat recovery system conducts the heat released by the combustion chamber in the heat recovery system to the external air box in the heat recovery system; The heat exchange device in the heat recovery system stores the heat of the external air box into the heat storage device in the heat recovery system.

9. The heat recovery system according to claim 8, characterized in that: The heat extraction device is: a special-shaped heat pipe heat collector; the method for determining the structure of the special-shaped heat pipe heat collector includes: According to the temperature distribution, flow pattern distribution, startup characteristics and heat transfer characteristics of the tested special-shaped heat pipe heat exchangers with different structures during operation, the special-shaped heat pipe heat exchangers with target structures are determined from the tested special-shaped heat pipe heat exchangers with different structures.

10. The heat recovery system according to claim 9, characterized in that: The method for determining the number of special-shaped heat pipe heat collectors comprises: The number of the special-shaped heat pipe heat exchangers is determined based at least on the structure of the special-shaped heat pipe heat exchangers, the surface area of ​​the combustion chamber, and the thrust requirement of the equipment where the combustion chamber is located.

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