Heat regeneration tank and heat regeneration system
By using a heat recovery tank composed of porous solid heat storage materials and phase change materials in the thermal system, replacing traditional metal heat exchangers, the problems of system complexity and cost are solved, and efficient heat recovery function and economic improvement are achieved. .
Patent Information
- Application Number
- CN202420892370.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-04-26
AI Technical Summary
In traditional thermal systems, the heat recovery device is complex and costly, and the traditional heat exchanger is inefficient under low temperature conditions, resulting in system economy and waste of material use.
The heat recovery tank composed of porous solid heat storage materials and/or phase change materials replaces multiple expensive metal heat exchangers to form an integrated heat recovery module, reducing system complexity and cost.
The heat recovery function is guaranteed, while greatly reducing the system complexity and cost, improving the heat exchange efficiency, avoiding the expensive costs of multiple heat exchangers, and improving the economics of the system and material use efficiency.
Smart Images
Figure CN222352966U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thermal systems, in particular to a heat recovery tank and a heat recovery system. Background Art
[0002] In high-quality systems that supply high-temperature steam, electricity, etc., the working fluid used for heat exchange often still has a certain amount of low-quality heat after the heat exchange is completed. The characteristics of this heat are low quality, that is, the pressure and temperature parameters are not high, but the quantity is huge, and the types of working fluids carried are different, such as flue gas, steam, air, etc. In traditional system design, when recovering this heat, it is necessary to set up multiple heat exchangers in the system according to the type, parameters, and location of the working fluid, resulting in increased system complexity, decreased stability, and increased system cost. In addition, when designing and manufacturing traditional heat exchangers, they will also face the problem that the temperature of the working fluid is not high, the heat exchange end difference between the cold and heat sources is too small, but the required heat exchange amount is huge. Therefore, a considerable part of the heat exchangers account for a very high proportion of the cost in the system, but the energy obtained is limited, which causes a certain degree of waste in the system economy and material use. Utility Model Content
[0003] In order to solve the technical problem of defects in the heat recovery form in traditional thermal systems, the utility model provides a heat recovery tank and a heat recovery system, wherein the heat recovery tank can replace multiple expensive metal heat exchangers by loading porous solid heat storage materials and / or phase change materials in the tank body, thereby achieving an integrated heat exchange effect. In the heat recovery system, two heat recovery tanks form a heat recovery module, which not only ensures the heat recovery function but also greatly reduces the system complexity and system cost.
[0004] In order to solve the above problems, the technical solution provided by the utility model is:
[0005] A regenerative tank comprises a tank body, wherein the tank body is provided with a first flow port and a second flow port, wherein the tank body is only filled with a porous solid heat storage material; or the tank body is only filled with a phase change material; or the tank body is filled with a porous solid heat storage material and a phase change material.
[0006] Optionally, when the tank body is filled with only phase change material, the phase change material is filled with one or more types.
[0007] Optionally, when at least two phase change materials are filled, the phase change materials are arranged step by step from the first flow opening to the second flow opening according to the phase change temperature from high to low.
[0008] Optionally, when the tank body is filled with porous solid heat storage material and phase change material, the porous solid heat storage material is located in the middle of the tank body, the phase change material is located between the porous solid heat storage material and the first flow port, and / or the phase change material is located between the porous solid heat storage material and the second flow port.
[0009] Optionally, one or more phase change materials are arranged between the porous solid heat storage material and the first flow opening, and / or between the porous solid heat storage material and the second flow opening.
[0010] Optionally, at least two phase change materials are arranged between the porous solid heat storage material and the first flow port, and / or between the porous solid heat storage material and the second flow port, and the phase change materials are arranged step by step from the first flow port to the second flow port according to the phase change temperature from high to low.
[0011] Optionally, a medium circulation loop and a working fluid passage are provided in the tank body; the two ends of the working fluid passage are respectively connected to the first flow port and the second flow port; a heat exchange medium flows in the medium circulation loop, at least part of the medium circulation loop is used for heat exchange with the working fluid passage, and at least part of the medium circulation loop is used for heat exchange with the porous solid heat storage material and / or phase change material.
[0012] A reheat system, comprising an expander, a compressor and at least one reheat module, wherein the reheat module comprises two reheat tanks of the above type, which are defined as a first reheat tank and a second reheat tank respectively; the expander, the compressor and the reheat module constitute a first circulation loop and a second circulation loop; in the first circulation loop, the air outlet of the compressor is communicated with a first flow port of the first reheat tank, the second flow port of the first reheat tank is communicated with an air inlet of the expander, the air outlet of the expander is communicated with a second flow port of the second reheat tank, and the first flow port of the second reheat tank is communicated with an air inlet of the compressor; An external heat source exists on the communication path between the air outlet of the compressor and the first flow port of the first heat regeneration tank; in the second circulation loop, the air outlet of the compressor is communicated with the first flow port of the second heat regeneration tank, the second flow port of the second heat regeneration tank is communicated with the air inlet of the expander, the air outlet of the expander is communicated with the second flow port of the first heat regeneration tank, and the first flow port of the first heat regeneration tank is communicated with the air inlet of the compressor; an external heat source exists on the communication path between the air outlet of the compressor and the first flow port of the second heat regeneration tank; valve bodies are provided on both the first circulation loop and the second circulation loop.
[0013] Optionally, a gas-liquid separator is provided on the communication path between the air inlet end of the expansion machine in the first circulation loop and the second flow port of the first heat regeneration tank, and / or on the communication path between the air inlet end of the expansion machine in the second circulation loop and the second flow port of the second heat regeneration tank; an energy storage device and a heat exchanger are provided on the communication path between the air outlet end of the compressor in the first circulation loop and the first flow port of the first heat regeneration tank, and / or on the communication path between the air outlet end of the compressor in the second circulation loop and the first flow port of the second heat regeneration tank.
[0014] Optionally, a motor is also included, and the expander and the compressor are coaxial with the output shaft of the motor.
[0015] Beneficial Effects
[0016] The technical solution provided by the utility model has the following beneficial effects compared with the prior art: In response to the technical problem of defects in the heat recovery device in the traditional thermal system, the utility model provides a heat recovery tank and a heat recovery system, wherein the heat recovery tank can replace multiple expensive metal heat exchangers by loading porous solid heat storage materials and / or phase change materials in the tank body, thereby achieving an integrated heat exchange effect. When the heat recovery modules are formed into a group of two and applied to the heat recovery system, the heat recovery function is guaranteed and the system complexity and system cost are greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the structure of the heat recovery tank proposed in an embodiment of the utility model.
[0018] Figure 2 This is one of the implementation methods of the heat recovery system proposed in the embodiment of the utility model. DETAILED DESCRIPTION
[0019] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.
[0020] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. The words "first", "second", etc. described in the present utility model are set for the convenience of describing the technical solution of the present utility model, and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in the present application can be combined with each other. In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, and multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present utility model.
[0021] Example 1
[0022] Combined with Figure 1 This embodiment proposes a heat recovery tank for use in a heat recovery system. The tank body 100 is loaded with porous solid heat storage materials and / or phase change materials, thereby replacing multiple expensive metal heat exchangers, improving the heat exchange effect, and avoiding the use of excessive metal materials. The structure is simple, the amount of pipes and accessories is reduced, the complexity of the heat recovery system is reduced, and the cost investment and control cost of the heat recovery system are reduced.
[0023] The main body of the regenerative tank of this embodiment is a tank body 100, and the tank body 100 is provided with a first flow port 101 and a second flow port 102 for the inflow and outflow of working fluids. One of the main functions of the regenerative tank is heat storage, which is to absorb the heat of low-grade working fluids in the regenerative system. The characteristics of these low-grade working fluids are that the pressure and temperature parameters are not high, but the quantity is large, and the types of working fluids carried are different, such as flue gas, steam, air, etc. However, for the regenerative tank, since it mainly uses porous solid heat storage materials and / or phase change materials for heat storage, the type of working fluid has little effect on its heat storage capacity. In the process of heat storage in the regenerative tank, the low-grade working fluid is a heat source working fluid, or a hot working fluid, for the regenerative tank.
[0024] Another main function of the heat recovery tank is to release heat, which is used to preheat or heat the cold working fluid. The premise of heat release is the realization of the aforementioned heat storage function, that is, only when the heat recovery tank is fully heated by the hot working fluid can it release heat to the cold working fluid that needs to be preheated or heated. Similarly, since heat release is achieved by heat exchange between the porous solid heat storage material and / or phase change material loaded in the tank body 100 and the cold working fluid, the type of working fluid has little effect on the heat release capacity of the heat recovery tank. In terms of the heat exchange form of the heat recovery tank, there is also an essential difference from the traditional surface heat exchange, that is, the porous solid heat storage material or phase change material is in direct contact with the working fluid, and heat storage / exchange can be achieved in the form of fluidized bed heat exchange, which greatly improves the heat exchange effect. Compared with the metal heat exchange surface, the tank body 100 and the porous solid heat storage material or phase change material are low in cost, and can centrally recover waste heat from multiple parameter sources, avoiding the expensive cost of manufacturing multiple heat exchangers, and the cost of the heat recovery system is significantly reduced.
[0025] In this embodiment, the porous solid heat storage material filled in the tank body 100 may be solid waste such as copper slag, steel slag, and / or salts, concrete, ceramics, etc. The phase change material filled in the tank body 100 may be 96.5Ga-3.5Zn, 52Bi-26Pb-22In, or other types of phase change materials such as wax, polyethylene glycol, etc.
[0026] For the regenerative tank of this embodiment, combined with the description of the regenerative function and the heat release function, the benefit that can be imagined is that the type of working fluid can be ignored, and different types of working fluids can be used for heat release and heat absorption. In traditional systems, the types of working fluids are different, such as flue gas, steam, air, etc. When recovering the heat of these working fluids, multiple heat exchangers need to be set up in the system according to the type, parameters, and location of the working fluids, resulting in increased system complexity, decreased stability, and increased system cost. The regenerative tank of this embodiment can avoid the above defects and problems.
[0027] In different embodiments, the filling form in the tank body 100 is different, including at least three situations, namely, the tank body 100 is only filled with porous solid heat storage material; or the tank body 100 is only filled with phase change material; or the tank body 100 is filled with porous solid heat storage material and phase change material.
[0028] When the tank body 100 is filled with only porous solid heat storage materials, only one type of porous solid heat storage material can be used, such as the copper slag in the aforementioned embodiment. The application scenario of this form is that the working fluids that need to recover heat or heat are similar in form and parameters to each other, so that they can directly exchange heat with the porous solid heat storage material and recover it in a centralized manner. This form has the highest cost-effectiveness. It is conceivable that a tank body 100 can also be filled with multiple porous solid heat storage materials at the same time.
[0029] When the tank 100 is filled with phase change material, only one type of phase change material can be filled, and the preferred method is based on the type of heat recovery medium in the system. When at least two types of phase change materials are filled, a more preferred implementation is that the phase change materials are arranged step by step from the first flow port 101 to the second flow port 102 according to the phase change temperature from high to low, so as to absorb the temperature of the hot medium step by step, or heat the cold medium step by step.
[0030] The tank body 100 can also be filled with porous solid heat storage material and phase change material at the same time. In a more preferred layout, the porous solid heat storage material is located in the middle of the tank body 100, the phase change material is located between the porous solid heat storage material and the first flow port 101, and / or the phase change material is located between the porous solid heat storage material and the second flow port 102. In this embodiment, the instability of the inlet and outlet temperatures caused by the use of porous solid heat storage materials alone can be avoided, and the problem of high costs caused by the use of all phase change materials can be avoided to a certain extent, thereby improving the economy of the heat recovery tank. In addition, the phase change material located between the porous solid heat storage material and the first flow port 101, or the phase change material located between the porous solid heat storage material and the second flow port 102, can also be provided with one or more. When at least two phase change materials are provided, similar to the aforementioned embodiment in which only phase change materials are provided, the phase change materials are arranged step by step from the first flow port 101 to the second flow port 102 according to the phase change temperature from high to low.
[0031] On the basis of the three filling forms in the aforementioned tank body 100, a medium circulation loop and a working fluid passage can also be provided in the tank body 100; the two ends of the working fluid passage are respectively connected to the first flow port 101 and the second flow port 102, and a heat exchange medium circulates in the medium circulation loop, at least part of the medium circulation loop is used for heat exchange with the working fluid passage, and at least part of the medium circulation loop is used for heat exchange with the porous solid heat storage material and / or phase change material. In this embodiment, the working fluid exchanges heat with the heat recovery tank through the intermediate heat exchange medium, such as the cold fluid (air) exchanges heat with the porous solid heat storage material in the heat recovery tank through the heat transfer oil. This form is suitable for the situation where the heat recovery or heat absorption working fluid is not suitable for direct contact with the porous solid heat storage material, such as the situation where the system uses a working fluid with high cleanliness requirements. This embodiment exchanges heat through the intermediate heat exchange medium, so that the types of heat recovery working fluids that can be realized are richer, which greatly improves the practicality and convenience of the heat recovery tank, and enables the heat recovery tank to have greater replacement performance, greatly reducing costs.
[0032] Example 2
[0033] Combined with Figure 1 and 2 This embodiment proposes a heat recovery system, including an expander 201, a compressor 202 and at least one heat recovery module 20, the heat recovery module 20 includes two heat recovery tanks recorded in Example 1, which are defined as a first heat recovery tank and a second heat recovery tank respectively; the expander 201, the compressor 202 and the heat recovery module 20 constitute a first circulation loop and a second circulation loop, and valve bodies 203 are provided on both the first circulation loop and the second circulation loop.
[0034] In the first circulation loop, the air outlet of the compressor 202 is connected to the first flow port 101 of the first reheat tank, the second flow port 102 of the first reheat tank is connected to the air inlet of the expander 201, the air outlet of the expander 201 is connected to the second flow port 102 of the second reheat tank, and the first flow port 101 of the second reheat tank is connected to the air inlet of the compressor 202; there is an external heat source on the communication path between the air outlet of the compressor 202 and the first flow port 101 of the first reheat tank.
[0035] In the second circulation loop, the air outlet of the compressor 202 is connected to the first flow port 101 of the second heat regeneration tank, the second flow port 102 of the second heat regeneration tank is connected to the air inlet of the expander 201, the air outlet of the expander 201 is connected to the second flow port 102 of the first heat regeneration tank, and the first flow port 101 of the first heat regeneration tank is connected to the air inlet of the compressor 202; there is an external heat source on the communication path between the air outlet of the compressor 202 and the first flow port 101 of the second heat regeneration tank.
[0036] A heat recovery system proposed in this embodiment mainly includes at least one heat recovery module 20, which is composed of two heat recovery tanks proposed in the above embodiments. One heat recovery module 20 can replace multiple traditional heat exchangers in the original system, and achieve an integrated heat recovery effect. For a heat recovery module 20, one heat recovery tank is used to absorb the heat of the hot working fluid, and the other heat recovery tank heats the cold working fluid with the stored heat. The functions of the two heat recovery tanks in a heat recovery module 20 can be switched with each other, that is, when the heat of the heat recovery tank used to heat the working fluid is released to a certain extent, or when the heat recovery tank used to absorb the heat of the hot working fluid has fully absorbed the heat, the first circulation loop and the second circulation loop can be opened and closed or switched through the valve body 203, so that the hot working fluid flows into the heat recovery tank originally used to heat the cold working fluid, and the heat recovery tank originally used to absorb the heat of the hot working fluid is used to heat the cold working fluid.
[0037] As attached Figure 1 This is an implementation method of the heat recovery system of this embodiment. Figure 1 The figure shows an example of a heat recovery system applied to a heat pump heating system. In the system, air is used as a heat carrier, and the main heat exchange process is the transfer of heat from high-temperature air to the steam generation system and the heat storage system. The heat recovery sources that the system needs to collect include low-temperature air after heat exchange, low-temperature air at the hot side outlet of the steam generator, recovered steam or hot water carrying heat, and waste heat generated by other industrial processes in the industrial park.
[0038] In this example, the working fluids that need to recover heat in the system include air, steam and hot water, and the working fluid parameters are also different. If the heat recovery system is set up in the traditional way, at least three heat exchangers are required for heat recovery, and the pipelines need to be controlled separately, and the system is very complicated. In addition, the air flow rate that needs to be recovered in the system is large, the temperature is low, and the pressure is low. If the heat is recovered in the traditional way, the heat exchange effect is very poor. The heat regenerators set up need to be connected in parallel in multiple stages or have a large heat exchange area, which will cause the heat regenerator to account for more than 50% of the cost of the heat exchange system. The huge economic cost can only be used to recover low-grade heat, and the energy economy is very low.
[0039] In this example, there is no need to set up multiple heat exchangers. The heat recovery module 20 composed of two heat recovery tanks as a group can achieve the heat recovery effect of multiple heat exchangers in the traditional heat recovery system. For the convenience of explanation, in this example, the two heat recovery tanks in the figure are defined as the first heat recovery tank and the second heat recovery tank from left to right.
[0040] The working method of this example is as follows: the expander 201 and the compressor 202 constitute a heat pump, and the expander 201 and the compressor 202 are driven by the motor 207. The output shafts of the motors 207 of the two motors are coaxial, so that the heat pump is driven to work as a whole by one motor 207. The heat pump can produce high-grade working fluids such as high-temperature gas. The high-grade working fluid is output from the gas outlet of the compressor 202 and is used by an external heat source. After the external heat source consumes the energy in the high-grade working fluid, the high-grade working fluid is converted into a low-grade working fluid. The low-grade working fluid is a hot working fluid that needs to be reheated in the heat recovery system of this example.
[0041] When the first circulation loop is enabled by the control of the valve body 203, the first reheat tank is used to absorb the heat of the hot working fluid, and the second reheat tank is used to heat the cold working fluid. The hot working fluid that needs to be reheated will enter the first reheat tank from the first flow port 101 of the first reheat tank, and most of the heat carried by the hot working fluid will be absorbed by the porous solid heat storage material and / or phase change material in the reheat tank. The hot working fluid after absorbing the heat will flow out from the second flow port 102 of the first reheat tank and enter the air inlet end of the expander 201. Since the working fluid in this example is a water-containing working fluid such as water vapor, a gas-liquid separator 204 can be set on the communication path between the air inlet end of the expander 201 and the second flow port 102 of the first reheat tank to perform gas-liquid separation so that the gas can enter the expander 201 alone. The expander 201 further consumes the remaining energy of the hot working fluid. At this time, the hot working fluid is converted into a cold working fluid and enters the second heat regeneration tank through the second flow port 102. Since heat is pre-stored in the second heat regeneration tank, the heat of the porous solid heat storage material and / or phase change material in the second heat regeneration tank will be transferred to the cold working fluid, and the cold working fluid is thereby heated. The cold working fluid continues to flow out from the first flow port 101 of the second heat regeneration tank and enters the air intake end of the compressor 202. Therefore, the cold working fluid has been preheated before entering the compressor 202, and the waste heat in the system is thereby utilized, thereby saving energy in the system.
[0042] When the first circulation loop is started to a certain extent, the heat of the first reheat tank has been fully stored, and the heat in the second reheat tank has been fully absorbed by the cold working medium. The first reheat tank is not suitable for continuing to absorb the heat of the hot working medium, and the second reheat tank is not suitable for heating the cold working medium. At this time, the first circulation loop can be closed and the second circulation loop can be opened by opening and closing the valve body 203. It can be understood that the heat recovery system is a local functional system for the thermal system. The number and arrangement of the valve bodies 203 used to control the opening and closing of the first circulation loop and the second circulation loop are generally arranged according to the actual application of the thermal system. It is only necessary to ensure that the first circulation loop and the second circulation loop are established.
[0043] When the second circulation loop is activated by the control of the valve body 203, its working principle is similar to the first circulation loop, except that the second heat recovery tank is used to absorb the heat of the hot working medium, and the first heat recovery tank is used to heat the cold working medium. At this time, the working mode of the second circulation loop is:
[0044] The hot working medium that needs to be reheated will enter the first reheat tank from the first flow port 101 of the second reheat tank, and most of the heat carried by the hot working medium will be absorbed by the porous solid heat storage material and / or phase change material in the reheat tank. The hot working medium after absorbing the heat will flow out from the second flow port 102 of the second reheat tank and enter the air inlet end of the expander 201. Since the working medium in this example is a water-containing working medium such as water vapor, a gas-liquid separator 204 can be set on the communication path between the air inlet end of the expander 201 and the second flow port 102 of the second reheat tank to perform gas-liquid separation so that the gas can enter the expander 201 alone. The expander 201 further consumes the remaining energy of the hot working fluid. At this time, the hot working fluid is converted into a cold working fluid and enters the first reheat tank through the second flow port 102. Since the first reheat tank has stored enough heat when the first circulation loop is activated, the heat of the porous solid heat storage material and / or phase change material in the first reheat tank will be transferred to the cold working fluid, and the cold working fluid will be heated. The cold working fluid continues to flow out from the first flow port 101 of the first reheat tank and enter the air intake end of the compressor 202. Therefore, the cold working fluid has been preheated before entering the compressor 202, and the waste heat in the system is also utilized, thereby saving energy in the system.
[0045] Similar to the working mode of the first circulation loop, when the second circulation loop is started to a certain extent, the heat in the second heat regeneration tank has been fully stored, and the heat in the first heat regeneration tank has been fully absorbed by the cold working fluid. The second heat regeneration tank is not suitable for continuing to absorb the heat of the hot working fluid, and the first heat regeneration tank is not suitable for heating the cold working fluid. At this time, the second circulation loop can be closed and the first circulation loop can be opened by opening and closing the valve body 203.
[0046] An energy storage device 205 and a heat exchanger 206 are provided on the communication path between the air outlet end of the compressor 202 in the aforementioned first circulation loop and the first flow port 101 of the first heat recovery tank, and / or on the communication path between the air outlet end of the compressor 202 in the second circulation loop and the first flow port 101 of the second heat recovery tank, so as to enrich the heat exchange and energy storage function of the heat recovery system.
[0047] Combined with the above-mentioned embodiments, for the heat recovery system of this example, in one embodiment, the heat recovery tank is filled with multi-stage phase change materials to achieve heat transfer from cold and hot sources and meet the requirements of the outlet temperature range. Taking the three-stage phase change material as an example, they are: Material 1 can use 96.5Ga-3.5Zn, phase change temperature 25°C, phase change enthalpy 88.5kj / kg; Material 2 can use 52Bi-26Pb-22In, phase change temperature 70°C, phase change enthalpy 29kj / kg; or other types of phase change materials, such as wax, polyethylene glycol and other materials. The arrangement order of the three-stage phase change material can refer to the situation mentioned in the above-mentioned embodiment, and it is arranged step by step from the first flow port 101 to the second flow port 102 according to the phase change temperature from high to low. The first circulation loop and the second circulation loop have taken into account the situation of setting up multi-stage phase change materials, and the flow direction of the cold and hot working fluids in the first circulation loop and the second circulation loop matches the arrangement of the multi-stage phase change material.
[0048] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creative design without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.
Claims
1. A reheat tank, characterized in that: It comprises a tank body, which is provided with a first flow port and a second flow port, and the tank body is only filled with porous solid heat storage material; or the tank body is only filled with phase change material; or the tank body is filled with porous solid heat storage material and phase change material.
2. A regenerative tank according to claim 1, characterized in that: When the tank body is filled with only phase change material, the phase change material is filled with one or more types.
3. A regenerative tank according to claim 2, characterized in that: When at least two types of phase change materials are filled, the phase change materials are arranged step by step from the first flow opening to the second flow opening according to the phase change temperature from high to low.
4. The regenerative tank according to claim 1, characterized in that: When the tank body is filled with porous solid heat storage material and phase change material, the porous solid heat storage material is located in the middle of the tank body, the phase change material is located between the porous solid heat storage material and the first flow port, and / or the phase change material is located between the porous solid heat storage material and the second flow port.
5. A regenerative tank according to claim 4, characterized in that: One or more phase change materials are arranged between the porous solid heat storage material and the first flow opening, and / or between the porous solid heat storage material and the second flow opening.
6. A regenerative tank according to claim 5, characterized in that: At least two phase change materials are arranged between the porous solid heat storage material and the first flow port, and / or between the porous solid heat storage material and the second flow port, and the phase change materials are arranged step by step from the first flow port to the second flow port according to the phase change temperature from high to low.
7. A regenerative tank according to any one of claims 1 to 6, characterized in that: A medium circulation loop and a working fluid passage are provided in the tank body; two ends of the working fluid passage are connected to the first flow port and the second flow port respectively; A heat exchange medium flows in the medium circulation loop, and at least part of the medium circulation loop is used for heat exchange with the working fluid passage, and at least part of the medium circulation loop is used for heat exchange with the porous solid heat storage material and / or phase change material.
8. A heat recovery system, characterized in that: It comprises an expander, a compressor and at least one regenerative module, wherein the regenerative module comprises two regenerative tanks according to any one of claims 1 to 7, which are defined as a first regenerative tank and a second regenerative tank respectively; the expander, the compressor and the regenerative module constitute a first circulation loop and a second circulation loop; In the first circulation loop, the air outlet of the compressor is connected to the first flow port of the first reheat tank, the second flow port of the first reheat tank is connected to the air inlet of the expander, the air outlet of the expander is connected to the second flow port of the second reheat tank, and the first flow port of the second reheat tank is connected to the air inlet of the compressor; an external heat source exists on the communication path between the air outlet of the compressor and the first flow port of the first reheat tank; In the second circulation loop, the air outlet of the compressor is connected to the first flow port of the second reheat tank, the second flow port of the second reheat tank is connected to the air inlet of the expander, the air outlet of the expander is connected to the second flow port of the first reheat tank, and the first flow port of the first reheat tank is connected to the air inlet of the compressor; an external heat source exists on the communication path between the air outlet of the compressor and the first flow port of the second reheat tank; The first circulation loop and the second circulation loop are both provided with valve bodies.
9. A heat recovery system according to claim 8, characterized in that: A gas-liquid separator is provided on the communication path between the air inlet end of the expander in the first circulation loop and the second flow port of the first reheat tank, and / or on the communication path between the air inlet end of the expander in the second circulation loop and the second flow port of the second reheat tank; An energy storage device and a heat exchanger are provided on the communication path between the air outlet end of the compressor in the first circulation loop and the first flow port of the first heat recovery tank, and / or on the communication path between the air outlet end of the compressor in the second circulation loop and the first flow port of the second heat recovery tank.
10. A heat recovery system according to claim 8, characterized in that: It also includes a motor, and the expander and the compressor are coaxial with the output shaft of the motor.