Compressed air energy storage waste heat recovery device

Abstract

The invention relates to the technical field of air energy storage, and particularly discloses a compressed air energy storage waste heat recovery device which comprises a heating mechanism, a waste heat recovery mechanism and a waste heat recovery mechanism, the heating mechanism comprises a preheating box, heat exchange liquid and a heat exchanger, the preheating box is filled with the heat exchange liquid, and the heat exchanger is arranged in the preheating box and used for transferring heat generated by air energy storage equipment into the preheating box; the preheating mechanism comprises an air inlet pipe penetrating through the preheating box, and the air inlet pipe is used for inputting to-be-heated air and outputting the to-be-heated air to the air energy storage equipment after the to-be-heated air is heated by the heating mechanism; the flow guide mechanism is used for disturbing the heat exchange liquid. By means of the first fan blade, the second fan blade and the flow guide pipe which are in linkage, heat exchange liquid is forcibly driven to flow in a layered and circulating mode, the problem of local overheating or insufficient heat exchange is avoided, the waste heat absorption efficiency is improved, the preheating mechanism monitors the gas temperature in real time and cooperates with the three-way valve to automatically switch the airflow path, and it is guaranteed that the air inlet temperature of the air compressor is stable and consistent; heat generated by the air compressor is recovered and guided into the heat exchanger as a heat source without extra consumption of external energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air energy storage, in particular to a compressed air energy storage waste heat recovery device. BACKGROUND

[0002] Large-scale energy storage technology has become the key to supporting renewable energy consumption and flexible peak regulation of power grids. As a mature physical energy storage technology, compressed air energy storage occupies an important position in the field of grid-side energy storage due to its long service life, low cost and large-scale application potential. However, in the operation process of the traditional system, the compressed air of the air compressor will generate a large amount of waste heat, which will cause significant energy waste if directly discharged. At the same time, the excessively high or low temperature of the compressed air will affect the efficiency of the air compressor and the subsequent expansion power generation performance. Therefore, efficient recovery of waste heat in the compressed air energy storage process is of great significance to improve the overall energy efficiency of the system and reduce the operating cost.

[0003] In the prior art, the device for recovering waste heat mainly adopts the direct heat exchange mode of the heat exchanger, but has the following defects: firstly, the fluid (heat exchange medium or compressed air) is not evenly distributed in the preheating box, which easily leads to local overheating or insufficient heat exchange, reducing the waste heat recovery efficiency; secondly, temperature detection is mainly single-point monitoring, lacking a dynamic adjustment mechanism, which cannot real-time match the gas temperature fluctuation, affecting the preheating effect; thirdly, some devices rely on external heat sources to supplement heat, increasing the system energy consumption.

[0004] Therefore, it is necessary to provide a compressed air energy storage waste heat recovery device to solve the above problems. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the deficiencies of the prior art, provide a compressed air energy storage waste heat recovery device with high recovery efficiency and without external energy, and the technical scheme is as follows: A compressed air energy storage waste heat recovery device, comprising: A heating mechanism is arranged on the air energy storage device, comprising a preheating box, a heat exchange liquid filled in the preheating box, and a heat exchanger arranged in the preheating box, the heat exchanger is also in communication with the heat generating part of the air energy storage device, for transferring the heat generated by the air energy storage device to the preheating box; A preheating mechanism comprising an air inlet pipe arranged through the preheating box, the air inlet pipe is used for inputting the gas to be heated and outputting to the air energy storage device after being heated by the heating mechanism; A flow guide mechanism is arranged in the preheating box for disturbing the heat exchange liquid.

[0006] As a further improvement of the above technical scheme: The heat exchanger is a heat exchange fin, and the heat exchange fin is in the shape of a wave.

[0007] As a further improvement of the above technical solution: The heat exchange liquid is heat conducting oil.

[0008] As a further improvement of the above technical solution: The air inlet pipe is arranged in a U shape in the preheating box.

[0009] As a further improvement of the above technical solution: The preheating mechanism further comprises a return pipe, a temperature sensor, a three-way valve and a one-way valve; The input end of the return pipe is connected to the output end of the air inlet pipe through the three-way valve, the output end of the return pipe is connected to the input end of the air inlet pipe through the one-way valve, and the temperature sensor is used to detect the gas temperature of the output end of the air inlet pipe; The three-way valve is configured to conduct the output end of the air inlet pipe and the input end of the return pipe, or conduct the output end of the air inlet pipe to the air energy storage device, according to the detected temperature of the temperature sensor.

[0010] As a further improvement of the above technical solution: The flow guiding mechanism comprises a flow guiding pipe, a first fan blade and a second fan blade; The flow guiding pipe is a T-shaped flow guiding pipe, the first fan blade and the second fan blade are both rotationally arranged in the flow guiding pipe, and the rotation axes of the first fan blade and the second fan blade are perpendicular to each other.

[0011] As a further improvement of the above technical solution: The first fan blade and the second fan blade are both rotationally arranged in the flow guiding pipe through a bearing seat.

[0012] As a further improvement of the above technical solution: The flow guiding mechanism further comprises a driving motor, and the first fan blade or the second fan blade is in transmission connection with the driving motor. The first fan blade and the second fan blade are in transmission connection through a bevel gear set.

[0013] As a further improvement of the above technical solution: A plurality of groups of the flow guiding pipe, the first fan blade and the second fan blade are correspondingly arranged, and the driving motor is in transmission connection with the plurality of groups of the first fan blade or the second fan blade through a planetary gear set.

[0014] As a further improvement of the above technical solution: The heat exchanger is in communication with the heat generating part of the air energy storage device through a heating pipe.

[0015] Compared with the prior art, the present application has the following advantages: 1. This invention uses the first and second fan blades and the T-shaped guide pipe in the flow guiding mechanism to force the heat exchange liquid to circulate in layers, extending its contact path and time with the corrugated heat exchange fins, avoiding local overheating or insufficient heat exchange, and improving the waste heat absorption efficiency. The preheating mechanism monitors the gas temperature in the intake pipe in real time through a temperature sensor and automatically switches the airflow path with a three-way valve, reducing the compression energy consumption of the air compressor caused by fluctuations in the intake temperature.

[0016] 2. The direct connection design between the heating tube and the heating end of the air compressor in this invention allows the waste heat generated during the operation of the air compressor to be directly introduced into the heat exchanger as a heat source, eliminating the need for additional external energy consumption and realizing the cascade utilization of energy. The one-way valve on the return pipe effectively prevents insufficiently preheated compressed air from flowing back into the air energy storage device through the return path, avoiding interference from low-temperature gas on the internal operating conditions of the equipment, and ensuring the stability of the compression process and the lifespan of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a compressed air energy storage waste heat recovery device of the present invention in application; Figure 2 for Figure 1 Another structural diagram from a different perspective; Figure 3 for Figure 1 Schematic diagram of the internal structure of the preheating box; Figure 4 This is a diagram showing the engagement of the first and second bevel gears in the compressed air energy storage waste heat recovery device of the present invention. Figure 5 This is a diagram showing the engagement of the first gear and the second gear in the compressed air energy storage waste heat recovery device of the present invention.

[0018] In the attached diagram: 1. Air storage device; 2. Preheating box; 3. First fan blade; 4. Guide pipe; 5. Second fan blade; 6. Inlet pipe; 7. Three-way valve; 8. Temperature sensor; 9. Return pipe; 10. Drive motor; 11. First gear; 12. Second gear; 13. First bevel gear; 14. Second bevel gear; 15. Heat exchanger; 16. Heat exchange fins; 17. Heating tube; 18. One-way valve. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 1-5The compressed air energy storage waste heat recovery device shown includes a heating mechanism arranged on the air energy storage device, including a preheating box, heat exchange liquid filled in the preheating box, and a heat exchanger arranged in the preheating box, the heat exchanger also communicates with the heat generating part of the air energy storage device, for transmitting the heat generated by the air energy storage device to the preheating box; a preheating mechanism including an air inlet pipe arranged through the preheating box, the air inlet pipe is used for inputting the gas to be heated, and outputting to the air energy storage device after being heated by the heating mechanism; a flow guide mechanism arranged in the preheating box, for disturbing the heat exchange liquid, the disturbed liquid enhances the turbulent flow, and improves the heat exchange efficiency.

[0021] The heat exchanger is a heat exchange fin, the heat exchange fin is in a wave shape, and the wave-shaped heat exchange fin increases the heat exchange area.

[0022] The heat exchange liquid is heat conducting oil.

[0023] The air inlet pipe is arranged in a U shape in the preheating box.

[0024] The preheating mechanism further includes a return pipe, a temperature sensor, a three-way valve and a one-way valve; the input end of the return pipe is connected to the output end of the air inlet pipe through the three-way valve, the output end of the return pipe is connected to the input end of the air inlet pipe through the one-way valve, and the temperature sensor is used for detecting the gas temperature of the output end of the air inlet pipe; the three-way valve is arranged to be able to conduct the output end of the air inlet pipe and the input end of the return pipe according to the detection temperature of the temperature sensor, or conduct the output end of the air inlet pipe to the air energy storage device. The one-way valve can prevent the unpreheated gas from entering the air compressor through the return pipe.

[0025] The flow guide mechanism in the embodiment includes four groups of flow guide pipes, four groups of first fan blades and four groups of second fan blades; the flow guide pipe is fixedly connected in the inner cavity of the preheating box, is a T-shaped flow guide pipe, the first fan blade and the second fan blade are rotatably arranged in the flow guide pipe through a bearing seat, and the rotation axes of the first fan blade and the second fan blade are perpendicular to each other. The number of the flow guide pipes is four, the shape of the flow guide pipe is T-shaped, the T-shaped flow guide pipe forms a three-dimensional flow guide network, guides the liquid to flow in multiple directions, and avoids dead zones.

[0026] The first and second blades are connected by a bevel gear set. Specifically, the first blade is fixedly connected with a first bevel gear on the rotating shaft, the first bevel gear is in surface engagement with a second bevel gear, and the second bevel gear is coaxially connected with the rotating shaft of the second blade. The flow guide mechanism further comprises a driving motor, the output shaft of the driving motor is fixedly connected with a first gear, the first gear is in surface engagement with a second gear, and the second gear is coaxially connected with the rotating shaft of the first blade. Through the above arrangement, the driving motor simultaneously drives the first and second blades to rotate. The first blade drives the second blade to rotate through the first and second bevel gears, converts the horizontal rotation into the vertical direction, and drives the second blade in the flow guide pipe to rotate, thereby accelerating the circulation of the heat exchange liquid.

[0027] The driving motor is fixedly connected to the top of the air energy storage device through a mounting bracket.

[0028] In order to further realize that the driving motor simultaneously drives four groups of first and second blades to rotate in the embodiment, the output shaft of the driving motor simultaneously drives four second gears to rotate through the first gear, the first gear and the four second gears form a planetary gear set, the second gear provides power to drive the first blade to rotate and stir the liquid, the first blade drives the second blade to rotate through the first and second bevel gears, converts the horizontal rotation into the vertical direction, drives the second blade in the flow guide pipe to rotate, thereby accelerating the circulation of the liquid, forms a three-dimensional flow guide network with the T-shaped flow guide pipe, and guides the liquid to flow in multiple directions to avoid dead zones.

[0029] The output shaft of the driving motor simultaneously drives four second gears to rotate through the first gear, the second gear provides power to drive the first blade to rotate and stir the liquid, the first blade drives the second blade to rotate through the first and second bevel gears, and pushes the heat exchange liquid to flow in layers along the T-shaped flow guide pipe, prolongs the contact time of the heat exchange liquid with the wave-shaped heat exchange fins, and improves the heat exchange efficiency. The compressed air that needs to be preheated enters the inner cavity of the preheating box through the U-shaped array of air inlet pipes.

[0030] The heat exchanger is in communication with the heat generating part of the air energy storage device through a heating pipe, the heating pipe is connected to the heat generating end of the air compressor to directly introduce the waste heat of the air compressor, and external heat source energy consumption is avoided.

[0031] In the embodiment, the first blade and the second blade in the flow guide mechanism are linked and rotated to drive the heat exchange liquid in the preheating box to flow in layers along the T-shaped flow guide pipe, prolong the contact time of the heat exchange liquid with the wave-shaped heat exchange fins, avoid local overheating or insufficient heat exchange, and significantly improve the waste heat recovery efficiency. The preheating mechanism cooperates with the temperature sensor through the three-way valve to realize closed-loop control of the gas temperature. When the gas temperature meets the standard, the gas directly enters the air energy storage device, and when the gas temperature does not meet the standard, the gas returns to the preheating box through the return pipe for secondary heating, so as to ensure that the gas temperature entering the device is stable and reduce the compression energy consumption of the air compressor.

[0032] The working principle of the present application is that the waste heat generated by the operation of the air compressor is transmitted to the heat exchanger through the heating pipe to heat the heat exchange liquid (such as heat conducting oil) in the preheating box, and then the gas to be heated enters the air inlet pipe, which is in the shape of U and passes through the heat exchange liquid in the preheating box, thereby realizing the heating of the gas by the waste heat generated by the operation of the air compressor. At the same time, the temperature sensor detects the temperature of the gas in the air inlet pipe in real time, if the temperature is greater than the set threshold, the three-way valve switches to the straight-through state, the gas directly enters the air energy storage device to participate in the compression process, if the temperature is lower than the set threshold, the three-way valve switches to the backflow state, the gas returns to the bottom of the inner cavity of the preheating box through the backflow pipe and contacts the heat exchange liquid again to be heated, and then reenters the air energy storage device after the temperature reaches the standard, the one-way valve on the backflow pipe ensures that the gas can only flow from the preheating box to the air inlet pipe, avoiding backflow.

[0033] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Improvements and changes made by those skilled in the art without departing from the technical concept of the present application should also be considered as the protection scope of the present application.

Claims

1. A compressed air energy storage waste heat recovery device, characterized by, The application relates to an air energy storage device, which comprises a heating mechanism, a preheating mechanism and a flow guiding mechanism. The heating mechanism is arranged on the air energy storage device and comprises a preheating box, heat exchange liquid filled in the preheating box and a heat exchanger arranged in the preheating box and communicated with a heat generating part of the air energy storage device, which is used for transmitting heat generated by the air energy storage device to the preheating box. The preheating mechanism comprises an air inlet pipe arranged through the preheating box, which is used for inputting gas to be heated and outputting the heated gas to the air energy storage device. The flow guiding mechanism is arranged in the preheating box and is used for disturbing the heat exchange liquid.

2. The compressed air energy storage waste heat recovery device of claim 1, wherein, The heat exchanger is a heat exchange fin in a wave shape.

3. The compressed air energy storage waste heat recovery device of claim 2, wherein, The heat exchange liquid is heat conducting oil.

4. The compressed air energy storage waste heat recovery device of claim 1, wherein, The air inlet pipe is arranged in a U shape in the preheating box.

5. The compressed air energy storage waste heat recovery apparatus of any one of claims 1-4, wherein, The preheating mechanism further comprises a backflow pipe, a temperature sensor, a three-way valve and a one-way valve. An input end of the backflow pipe is connected to an output end of the air inlet pipe through the three-way valve, an output end of the backflow pipe is connected to an input end of the air inlet pipe through the one-way valve, and the temperature sensor is used for detecting the temperature of gas at the output end of the air inlet pipe. The three-way valve is arranged to be able to conduct the output end of the air inlet pipe and the input end of the backflow pipe or the output end of the air inlet pipe to the air energy storage device according to the detected temperature of the temperature sensor.

6. The compressed air energy storage waste heat recovery device of claim 1, wherein, The flow guiding mechanism comprises a flow guiding pipe, a first fan blade and a second fan blade. The flow guiding pipe is a T-shaped flow guiding pipe, the first fan blade and the second fan blade are rotatably arranged in the flow guiding pipe, and the rotating shafts of the first fan blade and the second fan blade are perpendicular to each other.

7. The compressed air energy storage waste heat recovery device of claim 6, wherein, The first fan blade and the second fan blade are rotatably arranged in the flow guiding pipe through bearing seats.

8. The compressed air energy storage waste heat recovery apparatus of claim 6 or 7, wherein, The flow guiding mechanism further comprises a driving motor, the first fan blade or the second fan blade is in transmission connection with the driving motor. The first fan blade and the second fan blade are in transmission connection through a bevel gear set.

9. The compressed air energy storage waste heat recovery device of claim 8, wherein, The flow guiding pipe, the first fan blade and the second fan blade are correspondingly arranged in multiple groups, and the driving motor is in transmission connection with the multiple groups of the first fan blade or the second fan blade through a planetary gear set.

10. The compressed air energy storage waste heat recovery device of claim 1, wherein, The heat exchanger is communicated with the heat generating part of the air energy storage device through a heating pipe.

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