Waste heat recovery system for compressed air energy storage

Abstract

The embodiment of the utility model discloses a compressed air energy storage waste heat recovery system which comprises a first compressor, a first rotational flow strengthening heat exchanger, a second compressor, a second rotational flow strengthening heat exchanger, an air storage chamber, a pump, a low-temperature water storage tank and a high-temperature water storage tank. An inlet of the second compressor is connected with the first rotational flow intensified heat exchanger, an outlet of the second compressor is connected with the second rotational flow intensified heat exchanger, and the gas storage chamber is connected with the second rotational flow intensified heat exchanger; an inlet of the pump is connected with the low-temperature water storage tank, an outlet of the pump is connected with the first rotational flow intensified heat exchanger, and the high-temperature water storage tank is respectively connected with the first rotational flow intensified heat exchanger and the second rotational flow intensified heat exchanger. The utility model relates to a compressed air energy storage system, and aims to solve the problem that in the prior art, a large amount of heat is generated when air is compressed, and the heat is generally dissipated into the environment in a cooling water form to cause energy loss in a compressed air energy storage system.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a waste heat recovery system for compressed air energy storage. Background Art

[0002] Energy storage technology has always been one of the research hotspots in the energy field. It plays an important role in improving the stability of the power grid, balancing peak and valley power, and utilizing renewable energy. At present, compressed air energy storage is widely studied and applied. Compressed air energy storage is a technology based on compressed air for energy storage. The basic principle is that during peak hours, the electric energy in the power system is compressed by a compressor to compress the surrounding air, and the compressed air is stored in underground reservoirs or gas tanks. When the demand is at a peak or the system needs it, the compressed air is released to drive the turbine generator, converting the stored energy into electrical energy and injecting it into the power grid. However, there are some problems with the existing compressed air energy storage system. One of the problems is that the waste heat generated in the system cannot be effectively utilized, which leads to energy waste. In traditional compressed air energy storage systems, a large amount of heat is generated when the air is compressed, and this heat is usually dissipated into the environment in the form of cooling water, resulting in energy loss. Summary of the invention

[0003] The purpose of the present application is to provide a waste heat recovery system for compressed air energy storage, so as to solve the problem in the prior art that a large amount of heat is generated when the air is compressed in the compressed air energy storage system, and this heat is usually dissipated into the environment in the form of cooling water, causing energy loss.

[0004] To achieve the above-mentioned purpose, the embodiment of the present application provides a waste heat recovery system for compressed air energy storage, comprising: a first compressor, a first cyclone enhanced heat exchanger, a second compressor, a second cyclone enhanced heat exchanger, an air storage chamber, a pump, a low-temperature water storage tank, and a high-temperature water storage tank, wherein:

[0005] The first compressor outlet is connected to the first cyclone intensified heat exchanger, the second compressor inlet is connected to the first cyclone intensified heat exchanger, the second compressor outlet is connected to the second cyclone intensified heat exchanger, and the air storage chamber is connected to the second cyclone intensified heat exchanger;

[0006] The pump inlet is connected to the low-temperature water storage tank, the pump outlet is connected to the first cyclone-enhanced heat exchanger, and the high-temperature water storage tank is connected to the first cyclone-enhanced heat exchanger and the second cyclone-enhanced heat exchanger respectively.

[0007] Optionally, it further includes: a first motor, a second motor,

[0008] The first motor is connected to the first compressor, and the second motor is connected to the second compressor.

[0009] Optionally, it further includes: a swirl pot, a first ball valve, a first swirl starter, and a first one-way valve, wherein:

[0010] The swirl pot is connected to the pump outlet, the first flow meter is connected to the swirl pot through the first ball valve, the first flow meter is connected to the first swirler, the first swirler is connected to the first one-way valve, and the first one-way valve is connected to the first swirl enhanced heat exchanger.

[0011] Optionally, the high-temperature water storage tank is connected to the first cyclone enhanced heat exchanger via a third ball valve.

[0012] Optionally, it also includes: a second flow meter, a second ball valve, a second swirl device, a second check valve, and a second swirl enhanced heat exchanger, wherein:

[0013] The second flow meter is connected to the swirl pot through the second ball valve, the second flow meter is connected to the second swirl starter, the second swirl starter is connected to the second one-way valve, and the second one-way valve is connected to the second swirl enhanced heat exchanger.

[0014] Optionally, the high-temperature water storage tank is connected to the second cyclone enhanced heat exchanger via a fourth ball valve.

[0015] Optionally, the first cyclone intensified heat exchanger and / or the second cyclone intensified heat exchanger comprises: an air inlet, a shell, a gas outlet, a water outlet, a water inlet, a hemispherical protrusion, a fin plate, a rectangular protrusion, an air flow channel, a water flow channel, and a partition, wherein:

[0016] The partition separates the shell into two parts: an air flow channel and a water flow channel. The air inlet and the gas outlet are both connected to the air flow channel, the water outlet and the water flow inlet are both connected to the water flow channel, and the water flow inlet is tangentially connected to the shell. Hemispherical protrusions and rectangular protrusions are staggered along the partition, and the fins are staggered up and down along the partition to guide the water flow to rotate.

[0017] Optionally, the first rotator and / or the second rotator comprises: an inlet flange, a housing, an outlet flange, a support rod, a rear baffle, a connecting rod, a front baffle, a rotating blade, and a guide vane, wherein:

[0018] The inlet flange and the outlet flange are arranged at both ends of the shell, one end of the support rod is connected to the inner wall of the shell, the support rod extends into the center of the shell and is connected to the rear baffle, the rear baffle is connected to the front baffle through a connecting rod, the rotating blade is connected to the connecting rod through a bearing, and the guide plate is arranged at the rear of the rotating blade to guide the fluid to further rotate and flow.

[0019] The embodiments of the present application have the following advantages:

[0020] An embodiment of the present application provides a waste heat recovery system for compressed air energy storage, comprising: a first compressor, a first cyclone intensified heat exchanger, a second compressor, a second cyclone intensified heat exchanger, an air storage chamber, a pump, a low-temperature water storage tank, and a high-temperature water storage tank, wherein the first compressor outlet is connected to the first cyclone intensified heat exchanger, the second compressor inlet is connected to the first cyclone intensified heat exchanger, the second compressor outlet is connected to the second cyclone intensified heat exchanger, and the air storage chamber is connected to the second cyclone intensified heat exchanger; the pump inlet is connected to the low-temperature water storage tank, the pump outlet is connected to the first cyclone intensified heat exchanger, and the high-temperature water storage tank is connected to the first cyclone intensified heat exchanger and the second cyclone intensified heat exchanger, respectively.

[0021] Compared with the prior art, the system provided by the above technical solution recovers and utilizes the waste heat generated in the compressed air energy storage system by setting up a waste heat recovery module. Specifically, when the compressor compresses the air, the heat generated will be transferred to the working medium through the heat exchanger to increase its temperature. The heated working medium can be used for heating, hot water supply or other energy recovery and utilization. By recovering waste heat, efficient use of energy can be achieved and the energy conversion efficiency of the compressed air energy storage system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0023] Figure 1 A flow chart of a waste heat recovery system for compressed air energy storage provided for at least one embodiment of the present application;

[0024] Figure 2 A schematic diagram of the structure of a cyclone-enhanced heat exchanger for a waste heat recovery system for compressed air energy storage provided by at least one embodiment of the present application;

[0025] Figure 3 A schematic diagram of the structure of a vortex generator of a waste heat recovery system for compressed air energy storage provided in at least one embodiment of the present application. DETAILED DESCRIPTION

[0026] The following is a description of the implementation of the present application by specific specific embodiments. People familiar with the technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "set", "install", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0029] The existing compressed air energy storage waste heat recovery system usually uses a traditional heat exchanger. The simple heat exchange structure has low heat exchange efficiency, serious heat waste, and the waste heat of the system cannot be fully recovered, resulting in low waste heat recovery efficiency of the system. In addition, the traditional compressed air energy storage waste heat recovery system uses a pump to directly drive the water in the low-temperature water storage tank into the heat exchanger. The fluid flow rate of the pump drive method fluctuates greatly, and the fluid flows in the heat exchanger sometimes too fast and sometimes too slow, reducing the heat exchange effect of the fluid in the heat exchanger. At the same time, the pump directly drives the fluid into the heat exchanger, and the fluid flow state is mostly laminar. The relative position between the outer fluid near the wall and the inner fluid in the center of the pipe remains unchanged. The mass transfer between the outer fluid and the inner fluid is poor. The wall heat is mainly transferred to the outer fluid. The inner fluid cannot contact the wall and can only receive the heat transferred by the outer fluid, and the heat transfer effect is poor.

[0030] In view of the above problems, the present application provides a waste heat recovery system for compressed air energy storage, referring to Figures 1 to 3, including: a first cyclone intensified heat exchanger 3, a second motor 4, a second compressor 5, a second cyclone intensified heat exchanger 6, an air storage chamber 7, a low-temperature water storage tank 8, a pump 9, and a high-temperature water storage tank 21.

[0031] The outlet of the first compressor 2 is connected to the first cyclone-enhanced heat exchanger 3. The inlet of the second compressor 5 is connected to the first cyclone-enhanced heat exchanger 3. The outlet of the second compressor 5 is connected to the second cyclone-enhanced heat exchanger 6. The air storage chamber 7 is connected to the second cyclone-enhanced heat exchanger 6. The inlet of the pump 9 is connected to the low-temperature water storage tank 8.

[0032] In some embodiments, the system further comprises: a first motor 1 and a first compressor 2, wherein the first motor 1 is connected to the first compressor 2, and air enters through the inlet of the first compressor 2. The second motor 4 is connected to the second compressor 5.

[0033] In some embodiments, the invention further comprises: a swirl pot 10, a first ball valve 11, a first flow meter 12, a first swirl device 13, and a first check valve 14, wherein the swirl pot 10 is connected to the outlet of the pump 9. The first flow meter 12 is connected to the swirl pot 10 through the first ball valve 11. The first flow meter 12 is connected to the first swirl device 13. The first check valve 14 is connected to the first swirl device 13. The first check valve 14 is connected to the first swirl enhanced heat exchanger 3.

[0034] In some embodiments, the high temperature water storage tank 21 is connected to the first cyclone enhanced heat exchanger 3 via a third ball valve 19 .

[0035] In some embodiments, the invention further comprises: a second ball valve 15, a second flow meter 16, a second swirl device 17, and a second check valve 18. The second flow meter 16 is connected to the swirl pot 10 through the second ball valve 15. The second flow meter 16 is connected to the second swirl device 17. The second check valve 18 is connected to the second swirl device 17. The second check valve 18 is connected to the second swirl enhanced heat exchanger 6.

[0036] In some embodiments, the high temperature water storage tank 21 is connected to the second cyclone enhanced heat exchanger 6 via a fourth ball valve 20 .

[0037] The working process of the waste heat recovery system of compressed air energy storage: the air enters the first compressor 2 and is compressed to become high-temperature and high-pressure air. The high-temperature and high-pressure air flows from the outlet of the first compressor 2 into the first cyclone-enhanced heat exchanger 3 to exchange heat with water. The air after heat exchange becomes low-temperature and high-pressure air and flows into the second compressor 5 for further compression. The outlet of the second compressor 5 is high-temperature and high-pressure air, which enters the second cyclone-enhanced heat exchanger 6 for further heat exchange, and then becomes low-temperature and high-pressure air and enters the air storage chamber 7 for storage. The pump 9 pumps the water in the low-temperature water storage tank 8 into the stabilizing tank 10, and adjusts the opening of the first ball valve 11 and the second ball valve 15 to control the water flow. The first flowmeter 12 and the second flowmeter 16 measure the water flow, and the first vortex 13 and the second vortex 17 cause the water flow in the pipeline to rotate and flow, and the swirling water flow enters the first cyclone-enhanced heat exchanger 3 and the second cyclone-enhanced heat exchanger 6 for heat exchange. The water flow after heat exchange becomes high-temperature water flow, which enters the high-temperature water storage tank 21 for storage through the third ball valve 19 and the fourth ball valve 20.

[0038] In some embodiments, reference Figure 2 , Figure 2 : is a structural diagram of a cyclone-enhanced heat exchanger. In some embodiments, the first cyclone-enhanced heat exchanger 3 and the second cyclone-enhanced heat exchanger 6 are both of this structure. It includes an air inlet 22, a shell 23, a gas outlet 24, a water outlet 25, a water inlet 26, a hemispherical protrusion 27, a fin 28, a cuboid protrusion 29, an air flow channel 30, a water flow channel 31, and a partition 32. The partition 32 divides the shell 23 into two parts: an air flow channel 30 and a water flow channel 31. The air inlet 22 and the gas outlet 24 are both connected to the air flow channel 30. The water outlet 25 and the water inlet 26 are both connected to the water flow channel 31. The water inlet 26 is tangentially connected to the shell 23. Hemispherical protrusions 27 and cuboid protrusions 29 are staggered along the partition 32. The fins 28 are staggered up and down along the partition 32 to guide the water flow to rotate.

[0039] Working process of swirl enhanced heat exchanger: compressed air enters the air flow channel 30 through the air inlet 22, and the staggered hemispherical protrusions 27 and rectangular protrusions 29 enhance the turbulence of the air flow, enhance the heat exchange, and then flow out through the gas outlet 24. The water enters the water flow channel 31 tangentially from the water flow inlet 26, and the water flows in the water flow channel 31 in a rotating manner. The fins 28 staggered up and down serve as guide plates to further guide the water flow to rotate. In addition, the fins 28 increase the heat exchange surface area and improve the heat exchange performance. The rotating water flow increases the turbulence of the water flow, the mass transfer degree of each part of the water flow increases, the mixing degree of the water flow is enhanced, and the heat exchange between each part of the fluid and the air is enhanced. In addition, the rotating water flow increases the mileage of the water flow in the swirl enhanced heat exchanger, increases the flow time and heat exchange time of the water flow in the swirl enhanced heat exchanger, and improves the heat exchange performance of water and air. Finally, the water flows out through the water flow outlet 25.

[0040] In some embodiments, reference Figure 3 , Figure 3 : is a structural diagram of a swirler. In some embodiments, the first swirler 13 and the second swirler 17 are both of this structure. It includes an inlet flange 33, a shell 34, an outlet flange 35, a support rod 36, a rear baffle 37, a connecting rod 38, a front baffle 39, a rotating blade 40, and a guide vane 41. The inlet flange 33 and the outlet flange 35 are arranged at both ends of the shell 34. One end of the support rod 36 is connected to the inner wall of the shell 34. The support rod 36 extends into the center of the shell 34 and is connected to the rear baffle 37. The rear baffle 37 is connected to the front baffle 39 through a connecting rod 38. The rotating blade 40 is connected to the connecting rod 38 through a bearing. The guide vane 41 is arranged at the rear of the rotating blade 40 to guide the fluid to further rotate and flow.

[0041] Working process of the swirler: the fluid enters the swirler through the inlet flange 33, and the rotating blades 40 rotate under the drive of the fluid, changing the laminar flow state of the fluid into a swirl state. The fluid flows to the rear of the swirler, and the fluid further rotates and flows under the guidance of the guide vane 41.

[0042] In summary, compared with the prior art, through the above embodiments:

[0043] (1) A flow stabilization tank is installed at the outlet of the pump. The flow stabilization tank can buffer the flow fluctuation of the water flow. The ball valve at the outlet of the flow stabilization tank can control the flow of water, making the water flow more uniform.

[0044] (2) A swirler is installed at the inlet of the heat exchanger. The swirler can transform the laminar flow state of water in the pipe into a swirling state, thereby enhancing the flow between the outer layer water flow and the inner layer water flow. After the water flows into the heat exchanger, the contact opportunities between the fluid and the heat transfer wall surface at various parts are increased.

[0045] (3) A swirl intensified heat exchanger is provided. The swirl intensified heat exchanger is provided with a tangential water inlet to cause water swirl. While turbulent flow intensifies heat transfer, it increases the flow mileage of water in the heat exchanger and improves the heat exchange time. A baffle is provided in the water flow channel to further guide the rotational flow of the water flow. At the same time, the baffle can increase the surface area of ​​heat transfer, thereby improving the heat exchange effect and the waste heat recovery efficiency of the system.

[0046] Note that, unless otherwise directly stated, all features disclosed in this specification (including any attached claims, abstracts and drawings) may be replaced by alternative features for achieving the same, equivalent or similar purposes. Therefore, unless otherwise explicitly stated, each feature disclosed is only an example of a group of equivalent or similar features. Where used, further, preferably, further and more preferably are simple beginnings for elaborating another embodiment based on the aforementioned embodiment, and the content of the further, preferably, further or more preferably followed by the combination with the aforementioned embodiment constitutes a complete construction of another embodiment. Several further, preferably, further or more preferably settings following the same embodiment can be arbitrarily combined to form another embodiment.

[0047] In the implementation of functions and steps, the corresponding functions and steps in various embodiments may also occur in a different order than shown. For example, two consecutive functions and steps may actually be performed or implemented substantially in parallel, and they may sometimes be performed or implemented in the opposite order, depending on the functions involved.

[0048] Although the present application has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made to the present application. Therefore, these modifications or improvements made without departing from the spirit of the present application all fall within the scope of protection claimed in the present application.

Claims

1. A waste heat recovery system for compressed air energy storage, characterized in that: include: A first compressor, a first cyclone-enhanced heat exchanger, a second compressor, a second cyclone-enhanced heat exchanger, an air storage chamber, a pump, a low-temperature water storage tank, and a high-temperature water storage tank, wherein: The outlet of the first compressor is connected to the first cyclone intensified heat exchanger, the inlet of the second compressor is connected to the first cyclone intensified heat exchanger, the outlet of the second compressor is connected to the second cyclone intensified heat exchanger, and the air storage chamber is connected to the second cyclone intensified heat exchanger; The inlet of the pump is connected to the low-temperature water storage tank, the outlet of the pump is connected to the first cyclone-enhanced heat exchanger, and the high-temperature water storage tank is connected to the first cyclone-enhanced heat exchanger and the second cyclone-enhanced heat exchanger respectively.

2. The waste heat recovery system for compressed air energy storage according to claim 1, characterized in that: Also includes: a first motor, a second motor, The first motor is connected to the first compressor, and the second motor is connected to the second compressor.

3. The waste heat recovery system for compressed air energy storage according to claim 1, characterized in that: Also includes: A swirl pot, a first ball valve, a first swirl starter, a first check valve, and a first flow meter, wherein: The swirl pot is connected to the outlet of the pump, the first flow meter is connected to the swirl pot through the first ball valve, the first flow meter is connected to the first swirler, the first swirler is connected to the first one-way valve, and the first one-way valve is connected to the first swirl enhanced heat exchanger.

4. The waste heat recovery system for compressed air energy storage according to claim 1, characterized in that: The high-temperature water storage tank is connected to the first cyclone enhanced heat exchanger through a third ball valve.

5. The waste heat recovery system for compressed air energy storage according to claim 3 is characterized in that: Also includes: A second flow meter, a second ball valve, a second swirl device, a second check valve, and a second swirl enhanced heat exchanger, wherein: The second flow meter is connected to the swirl pot through the second ball valve, the second flow meter is connected to the second swirl starter, the second swirl starter is connected to the second one-way valve, and the second one-way valve is connected to the second swirl enhanced heat exchanger.

6. The waste heat recovery system for compressed air energy storage according to claim 1, characterized in that: The high-temperature water storage tank is connected to the second cyclone enhanced heat exchanger through a fourth ball valve.

7. The waste heat recovery system for compressed air energy storage according to claim 1, characterized in that: The first cyclone intensified heat exchanger and / or the second cyclone intensified heat exchanger comprises: an air inlet, a shell, a gas outlet, a water outlet, a water inlet, a hemispherical protrusion, a fin plate, a rectangular protrusion, an air flow channel, a water flow channel, and a partition, wherein: The partition separates the shell into two parts: an air flow channel and a water flow channel. The air inlet and the gas outlet are both connected to the air flow channel, the water outlet and the water flow inlet are both connected to the water flow channel, and the water flow inlet is tangentially connected to the shell. Hemispherical protrusions and rectangular protrusions are staggered along the partition, and the fins are staggered up and down along the partition to guide the water flow to rotate.

8. The waste heat recovery system for compressed air energy storage according to claim 5, characterized in that: The first rotator and / or the second rotator comprises: an inlet flange, a housing, an outlet flange, a support rod, a rear baffle, a connecting rod, a front baffle, a rotating blade, and a guide vane, wherein: The inlet flange and the outlet flange are arranged at both ends of the shell, one end of the support rod is connected to the inner wall of the shell, the support rod extends into the center of the shell and is connected to the rear baffle, the rear baffle is connected to the front baffle through a connecting rod, the rotating blade is connected to the connecting rod through a bearing, and the guide plate is arranged at the rear of the rotating blade to guide the fluid to further rotate and flow.

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