A CO2 hydrate continuous phase change air conditioning system and its working method

Abstract

A CO 2 The invention discloses a hydrate continuous phase change air conditioning system and a working method thereof, which belongs to the fields of industrial refrigeration, energy storage, and efficient application of cold energy. The system includes CO 2 Hydrate generation cold storage unit, CO 2 Hydrate spiral transport cooling unit, CO 2 Capture and accelerator recovery unit and data acquisition unit. In the cold storage stage, the chiller delivers cold energy and stores the cold energy in the CO 2 hydrate until the cold storage capacity in the tank reaches the maximum; in the cold release stage, the screw feeder is started to transfer CO 2 Hydrate is sent to the cooling coil for heat exchange, CO 2 Hydrate decomposition releases cold energy, which is then released to users who need cold energy; CO 2 Coming from the continuous capture from the plant, the hydrate formation promoter can be recycled and replenished in time, and the released CO 2 The system can continuously capture and recycle CO 2 The hydrate air-conditioning unit improves the refrigeration coefficient and makes efficient use of cold energy. It has the advantages of safety, environmental protection and high efficiency.

Description

Technical Field

[0001] The present invention relates to the fields of industrial refrigeration, energy storage, efficient application of cold energy, and more specifically to a CO2 hydrate continuous phase change air conditioning system. Background Art

[0002] Existing refrigeration cycles used for commercial purposes include steam compression refrigeration, absorption refrigeration, etc. The refrigeration performance coefficient of commercial air conditioners is relatively low, and the steam compression refrigeration and absorption refrigeration in existing research are also not high. The low refrigeration coefficient results in low cold energy utilization and poor energy saving effect. The improvement of equipment has not had a good effect on improving the refrigeration coefficient, so it is necessary to improve or change the refrigeration working cycle, improve the device structure, and improve the cold energy utilization efficiency. CO2 hydrate has a high latent heat of phase change compared to cold storage materials such as water, ice, and salt, and is one of the most advantageous materials. The existing CO2 hydrate cold storage system has problems such as the inability to continuously capture and fix CO2, poor contact and mixing effect between CO2 and hydrate formation promoters, complex structure of the hydrate transport and decomposition process, and low efficiency of hydrate decomposition cold energy release. Summary of the invention

[0003] The present invention is to solve the problems existing in the prior art and provide a CO2 hydrate continuous phase change air conditioning system. To achieve the above purpose, the present invention adopts the following technical solutions:

[0004] A CO2 hydrate continuous phase change air conditioning system, which continuously captures CO2 from the factory and sends it to a CO2 storage tank for storage to generate CO2 hydrate cold storage;

[0005] The system includes a CO2 hydrate generation and cold storage unit, a CO2 hydrate spiral transport and cold release unit, a CO2 capture and accelerator recovery unit, and a data acquisition unit;

[0006] The CO2 hydrate generation cold storage unit comprises a refrigeration device and a CO2 hydrate generation device; the water chiller in the refrigeration device is connected to a refrigeration coil via a first fluid pump, and the refrigeration coil passes through the CO2 hydrate generation tank and then leads back to the water chiller;

[0007] The CO2 hydrate generation device comprises a CO2 hydrate generation tank wrapped with a CO2 hydrate generation tank insulation cotton and a pipeline for injecting CO2 into the tank; a scraper driven by a scraper motor is arranged on the top of the CO2 hydrate generation tank, and the scraper acts on the inner wall of the tank body;

[0008] The outlet of the CO2 gas inlet pipe of the CO2 storage tank is divided into three branches. The first branch and the second branch are introduced into the tank from the upper part of the CO2 hydrate generation tank; the third branch passes through the gas separator and is respectively connected to the first gas generator and the second gas generator at the bottom of the inner side of the CO2 hydrate generation tank; the CO2 bubbles generated by the first gas generator and the second gas generator enter below the liquid level in the CO2 hydrate generation tank, so that the CO2 gas and the hydrate generation promoter are evenly mixed to promote the formation of CO2 hydrate;

[0009] The CO2 hydrate spiral conveying and cooling unit comprises a spiral feeder and a cooling coil, wherein the cooling coil is arranged between the CO2 hydrate generation tank and the CO2 capture and accelerator recovery tank; the spiral feeder passes through the bottom of the CO2 hydrate generation tank and the cooling coil; the cooling coil is connected to the user who needs cooling;

[0010] The CO2 capture and promoter recovery unit includes a CO2 capture and promoter recovery tank and a CO2 hydrate solid filter. The bottom of the CO2 capture and promoter recovery tank is connected back to the CO2 hydrate generation tank through a CO2 hydrate promoter recovery pipe, and the top is connected to the CO2 storage tank through a CO2 recovery pipe.

[0011] The refrigeration coil enters the CO2 hydrate generation tank at three-quarters of its height, spirals down along the inner wall to one-quarter of its height, and is led out and returned to the refrigeration unit.

[0012] The CO2 hydrate solid filter is located at the lower part of the CO2 capture and promoter recovery tank below the outlet of the screw feeder, and is used to separate the CO2 hydrate solid and liquid.

[0013] The screw feeder is driven by a feeding motor, which consists of an intermediate shaft and spiral blades. During the cooling stage, the feeding motor is started to drive the intermediate shaft of the screw feeder to rotate, thereby driving the spiral blades to rotate and transport the CO2 hydrate slurry in the direction of the cooling coil.

[0014] The first gas generator and the second gas generator are located below the screw feeder in the CO2 hydrate generation tank.

[0015] The data acquisition unit includes a first temperature sensor and a second temperature sensor located at the refrigeration coil entering and exiting the chiller, a third temperature sensor and a pressure sensor located above the liquid surface in the CO2 hydrate generation tank, a fourth temperature sensor located below the liquid surface in the CO2 hydrate generation tank, a fifth temperature sensor and a sixth temperature sensor located at the user water pipe entering and exiting the refrigeration coil, and a seventh temperature sensor located below the liquid surface inside the CO2 capture and promoter recovery tank, all of which are electrically connected to the computer monitoring and control system by a data transmission line.

[0016] A method for operating a CO2 hydrate continuous phase change air conditioning system comprises the following steps:

[0017] Cold storage stage: The chiller delivers cold energy to the CO2 hydrate generation tank through the refrigeration coil. The CO2 gas continuously captured from the factory starts from the CO2 storage tank and enters the tank from the top of the CO2 hydrate generation tank through the first branch pipe and the second branch pipe after passing through the CO2 gas introduction pipe. At the same time, after being connected to the gas separation device through the third branch pipe, it is divided into two branches and connected to the first gas generator and the second gas generator respectively, and enters the tank from the bottom of the inner side of the CO2 hydrate generation tank.

[0018] At the same time, the scraper motor is started to drive the scraper to stir the CO2 hydrate formation promoter, so as to promote full contact and mixing between CO2 and the CO2 hydrate formation promoter, thereby promoting the formation of CO2 hydrate;

[0019] Control the pressure and temperature, absorb cold energy to generate CO2 hydrate, until the cold storage capacity in the tank reaches the maximum;

[0020] Cooling release stage: The scraper motor drives the scraper to scrape off the CO2 hydrate solids fixed on the wall of the CO2 hydrate generation tank; the screw feeding motor is started to drive the screw feeder to send the CO2 hydrate solids to the cooling coil for heat exchange and decomposition to release cold energy; the user water pipe and cooling coil are started to release cold energy to users who need cold energy;

[0021] CO2 capture and promoter recovery: The undecomposed CO2 hydrate slurry in the cooling stage enters the CO2 capture and promoter recovery tank, and the hydrate generation promoter passes through the CO2 hydrate solid filter and enters the bottom of the CO2 capture and promoter recovery tank, and is then transported back to the CO2 hydrate generation tank through the CO2 hydrate promoter recovery pipe at the bottom of the tank;

[0022] The CO2 gas is transported to the CO2 storage tank through the CO2 recovery pipe on the top of the CO2 capture and promoter recovery tank for the next cycle.

[0023] The beneficial effects of the present invention are as follows: the present invention proposes a CO2 hydrate continuous phase change air conditioning system. The system can continuously capture CO2 from the factory, generate CO2 hydrate when storing cold, and decompose CO2 hydrate when releasing cold, thereby reducing the energy consumption and carbon emissions generated by refrigeration, and reducing the use of traditional Freon refrigerants. The hydrate generation promoter can be recycled and replenished in time, and the released CO2 can be continuously captured and recycled, thereby improving the refrigeration coefficient, making efficient use of cold energy, and having the advantages of safety, environmental protection, and high efficiency.

[0024] The beneficial effects of the present invention are as follows: the present invention proposes a CO2 hydrate continuous phase change air conditioning system. The system can continuously capture and fix CO2 from the factory. CO2 hydrate is generated when cold is stored, and CO2 hydrate is decomposed when cold is released. When CO2 enters the reaction tank, it is separated by a gas separator into two inlets at the upper and lower ends of the tank and enters the reaction tank. It is stirred by a scraper so that CO2 and a hydrate generation promoter are fully in contact and mixed, which promotes hydrate generation and improves the CO2 capture rate and the utilization rate of the hydrate generation promoter. When cold is released, the hydrate is transported out of the reaction tank by a spiral blade, and immediately exchanges heat with the hot water of the cold user after leaving. The CO2 hydrate is completely decomposed and the cold energy loss is small. The generation promoter can be recycled and replenished in time, and the released CO2 can be recycled, so that the cold energy is efficiently utilized, which has the advantages of safety, environmental protection, and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a CO2 hydrate continuous phase change air conditioning system.

[0026] In the figure: 1, CO2 storage tank, 2, CO2 gas introduction pipe, 2a, first branch pipe, 2b, second branch pipe, 2c, third branch pipe, 3, first gas pump, 4, second valve, 5, first valve, 6, scraper motor, 7, third valve, 8, fourth valve, 9, CO2 hydrate generation tank insulation cotton, 10, CO2 hydrate generation tank, 11, scraper, 12, refrigeration coil, 13, second gas pump, 14, first temperature sensor, 15, first fluid pump, 16, chiller, 17, second temperature sensor, 18, feeding motor, 19, gas distribution device, 20, first gas generator, 21, spiral feeding machine, 22. second fluid pump, 23. fourth temperature sensor, 24. second gas generator, 25. sixth temperature sensor, 26. fifth valve, 27. cooling coil, 28. flow meter, 29. cooling coil insulation cotton, 30. fifth temperature sensor, 31. seventh temperature sensor, 32. CO2 hydrate promoter recovery pipe, 33. CO2 capture and promoter recovery tank, 34. CO2 hydrate solid filter, 35. CO2 recovery pipe, 36. pressure sensor, 37. third temperature sensor, 38. user water pipe, 39. user who needs cooling, 40. data transmission line, 41. computer monitoring and control system. DETAILED DESCRIPTION Example 1

[0027] Figure 1 A CO2 hydrate continuous phase change air conditioning system is shown, including a CO2 hydrate generation cold storage unit, a CO2 hydrate spiral transport cold release unit, a CO2 capture and promoter recovery unit and a data acquisition unit;

[0028] The CO2 hydrate generation cold storage unit includes a refrigeration device and a CO2 hydrate generation device; the refrigeration device includes a chiller 16 and a first fluid pump 15, and a refrigeration coil 12 connected to each other. The refrigeration coil 12 is introduced into the CO2 hydrate generation tank 10 and spirals downward along the inner wall of the tank, and finally leads out to the refrigeration unit 16; the CO2 hydrate generation device includes a CO2 hydrate generation tank insulation cotton 9 wrapped with the CO2 hydrate generation tank 10, and the CO2 gas introduction pipe 2 is connected to the CO2 storage tank 1, the first gas pump 3 and the first valve 5 in sequence. The CO2 gas introduction pipe 2 is divided into three branches after leaving the first valve 5 and is respectively connected to the second valve 4, the third valve 7, and the fourth valve 8. The pipeline connecting the second valve 4 and the third valve 7 is introduced into the tank from the upper part of the CO2 hydrate generation tank 10, and the CO2 gas introduction pipe 2 connected to the fourth valve 8 is then connected to the second gas pump 13 and the gas separation device 19 in sequence, and is separately introduced into the inner bottom of the CO2 hydrate generation tank 10 and connected to the first gas generator 20 and the second gas generator 24 respectively.

[0029] The CO2 hydrate spiral conveying and cooling release unit includes a scraper motor 6 located at the top of the CO2 hydrate generation tank 10 and a scraper 11 driven by the scraper motor 6. The scraper 11 rotates coaxially with the output shaft of the scraper motor 6, and the rotation diameter is the diameter of the CO2 hydrate generation tank 10. The scraper motor 6 drives the scraper 11 to work during the cooling release stage to scrape off the CO2 hydrate solids fixed on the wall of the CO2 hydrate generation tank 10.

[0030] The CO2 hydrate screw conveying and cooling unit also includes a screw feeding motor 18 located on the outer side of the CO2 hydrate generating tank 10, and the screw feeding motor 18 is coaxially connected with the screw feeder 21;

[0031] The screw feeder 21 is composed of an intermediate bearing and a spiral blade, and the CO2 hydrate slurry is conveyed by the spiral blade. The screw feeder 21 is located at the bottom of the inner side of the CO2 hydrate generation tank 10, passes through the CO2 hydrate generation tank 10 and enters the cooling coil 27 after leaving the CO2 hydrate generation tank 10.

[0032] The outside of the cooling coil 27 is wrapped with cooling coil insulation cotton 29, and the cooling coil 27 is connected to the cooling user 39 via a user water pipe 38; the outlet of the screw feeder 21 after passing through the cooling coil 27 is connected to the CO2 capture and promoter recovery tank 33.

[0033] The CO2 capture and promoter recovery unit includes a CO2 capture and promoter recovery tank 33, a CO2 hydrate solid filter 34 located at the lower part of the tank below the outlet of the screw feeder 21, a CO2 recovery pipe 35 located at the top of the tank outside and connected to the CO2 storage tank 1, and a CO2 hydrate promoter recovery pipe 32 with an inlet at the bottom of the tank outside;

[0034] The CO 2 hydrate promoter recovery pipe 32 is connected to the flow meter 28 , the fifth valve 26 , and the second fluid pump 22 in sequence, and is finally introduced below the liquid level in the CO 2 hydrate generation tank 10 .

[0035] The data acquisition unit includes a first temperature sensor 14 and a second temperature sensor 17 located at the inlet and outlet of the refrigeration coil 12 to the chiller 16, a third temperature sensor 37 and a pressure sensor 36 located on the liquid surface in the CO2 hydrate generation tank 10, a fourth temperature sensor 23 located below the liquid surface in the CO2 hydrate generation tank 10, a fifth temperature sensor 30 and a sixth temperature sensor 25 located at the inlet and outlet of the user water pipe 38 to the refrigeration coil 27, and a seventh temperature sensor 31 located below the liquid surface inside the CO2 capture and promoter recovery tank 33. These sensors are all connected to the computer monitoring control unit 41 by a data transmission line 40.

[0036] When the above-mentioned CO2 hydrate continuous phase change air conditioning unit is used, the steps adopted are as follows:

[0037] The first step is the cold storage stage. The chiller 16 delivers cold energy to the CO2 hydrate generation tank 10 through the refrigeration coil 12. The CO2 gas continuously captured from the factory starts from the CO2 storage tank 1 and enters the tank from the upper part of the CO2 hydrate generation tank 10 through the CO2 gas introduction pipe 2, the first gas pump 3, the first valve 5, the second valve 4 or the third valve 7; at the same time, it enters the tank from the inner bottom of the CO2 hydrate generation tank 10 through the CO2 gas introduction pipe 2, the first gas pump 3, the first valve 5, the fourth valve 8, the second gas pump 13, the gas distribution device 19, the first gas generator 20 or the second gas generator 24, controls the appropriate pressure and temperature, absorbs cold energy to generate CO2 hydrate, until the cold storage in the tank reaches the maximum;

[0038] The second step is the cooling stage. Start the scraper motor 6 of the CO2 hydrate spiral conveying cooling unit and the scraper 11 driven by it to scrape off the CO2 hydrate solids fixed on the wall of the CO2 hydrate generation tank 10; start the screw feeding motor 18 and the screw feeder 21 driven by it to send the CO2 hydrate to the cooling coil 27 for heat exchange and decomposition to release the cooling energy; start the user water pipe 38 and the cooling coil 27 to release the cooling energy to the user 39 who needs cooling; control the speed of the screw feeding motor 18 and the flow rate and temperature of the water in the cooling coil 27 so that the cooling energy of the CO2 hydrate is fully released to the user 39 who needs cooling, and only a small amount of undecomposed CO2 hydrate slurry enters the CO2 capture and promoter recovery tank 33.

[0039] In the third step, the hydrate formation promoter and CO2 entering the CO2 capture and promoter recovery tank 33 are respectively recycled into the CO2 hydrate formation tank 10 and the CO2 storage tank 1 through the CO2 hydrate promoter recovery pipe 32, the flow meter 28, the fifth valve 26, the second fluid pump 22 and the CO2 recovery pipe 35, and replenished in time.

Claims

1. A CO2 hydrate continuous phase change air conditioning system, characterized in that: The system continuously captures CO2 from the plant and sends it to the CO2 storage tank (1) for storage to generate CO2 hydrate for cold storage; The system includes a CO2 hydrate generation and cold storage unit, a CO2 hydrate spiral transport and cold release unit, a CO2 capture and accelerator recovery unit, and a data acquisition unit; The CO2 hydrate generation cold storage unit comprises a refrigeration device and a CO2 hydrate generation device; the water chiller (16) in the refrigeration device is connected to the refrigeration coil (12) via a first fluid pump (15); the refrigeration coil (12) passes through the CO2 hydrate generation tank (10) and is then led back to the water chiller (16); The CO2 hydrate generating device comprises a CO2 hydrate generating tank (10) wrapped with a CO2 hydrate generating tank heat insulation cotton (9) and a pipeline for injecting CO2 into the tank; a scraper (11) driven by a scraper motor (6) is arranged on the top of the CO2 hydrate generating tank (10), and the scraper (11) acts on the inner wall of the tank body; The outlet of the CO2 gas inlet pipe (2) of the CO2 storage tank (1) is divided into three branches. The first branch pipe (2a) and the second branch pipe (2b) are introduced into the CO2 hydrate generation tank (10) from the upper part of the tank; the third branch pipe (2c) passes through the gas separation device (19) and is respectively connected to the first gas generator (20) and the second gas generator (24) at the bottom of the inner side of the CO2 hydrate generation tank (10); CO2 bubbles generated by the first gas generator (20) and the second gas generator (24) enter below the liquid level in the CO2 hydrate generation tank (10), so that the CO2 gas and the hydrate generation promoter are evenly mixed, thereby promoting the formation of CO2 hydrate; The CO2 hydrate spiral conveying and cooling unit comprises a spiral feeder (21) and a cooling coil (27), wherein the cooling coil (27) is arranged between the CO2 hydrate generation tank (10) and the CO2 capture and accelerator recovery tank (33); the spiral feeder (21) passes through the bottom of the CO2 hydrate generation tank (10) and the cooling coil (27); the cooling coil (27) is connected to a cooling user (39); The CO2 capture and promoter recovery unit comprises a CO2 capture and promoter recovery tank (33) and a CO2 hydrate solid filter (34); the bottom of the CO2 capture and promoter recovery tank (33) is connected back to the CO2 hydrate generation tank (10) via a CO2 hydrate promoter recovery pipe (32), and the top is connected to the CO2 storage tank (1) via a CO2 recovery pipe (35).

2. A CO2 hydrate continuous phase change air conditioning system according to claim 1, characterized in that: The refrigeration coil (12) enters the CO2 hydrate generation tank (10) at three quarters of its height, spirals downward along the inner wall to one quarter of its height, and is led out and returned to the refrigeration unit (16).

3. A CO2 hydrate continuous phase change air conditioning system according to claim 1, characterized in that: The CO2 hydrate solid filter (34) is located at the bottom of the CO2 capture and promoter recovery tank (33) and below the outlet of the screw feeder (21) to separate the CO2 hydrate solid and liquid.

4. A CO2 hydrate continuous phase change air conditioning system according to claim 1, characterized in that: The screw feeder (21) is driven by a feeding motor (18), and the screw feeder (21) is composed of an intermediate shaft and spiral blades. During the cooling stage, the feeding motor (18) is started to drive the intermediate shaft of the screw feeder (21) to rotate, thereby driving the spiral blades to rotate, and the CO2 hydrate slurry is transported in the direction of the cooling coil (27).

5. A CO2 hydrate continuous phase change air conditioning system according to claim 1, characterized in that: The first gas generator (20) and the second gas generator (24) are located below the screw feeder (21) in the CO2 hydrate generation tank (10).

6. A CO2 hydrate continuous phase change air conditioning system according to claim 1, characterized in that: The data acquisition unit comprises a first temperature sensor (14) and a second temperature sensor (17) located at the inlet and outlet of the cooling coil (12) of the chiller (16), a third temperature sensor (37) and a pressure sensor (36) located above the liquid surface in the CO2 hydrate generation tank (10), a fourth temperature sensor (23) located below the liquid surface in the CO2 hydrate generation tank (10), a fifth temperature sensor (30) and a sixth temperature sensor (25) located at the inlet and outlet of the user water pipe (38) of the cooling coil (27), and a seventh temperature sensor (31) located below the liquid surface inside the CO2 capture and accelerator recovery tank (33), all of which are electrically connected to the computer monitoring and control system (41) via a data transmission line (40).

7. A method for operating a CO2 hydrate continuous phase change air conditioning system according to any one of claims 1 to 6, characterized in that: The following steps are involved: Cold storage stage: the chiller (16) delivers cold energy to the CO2 hydrate generation tank (10) through the refrigeration coil (12); the CO2 gas continuously captured from the factory starts from the CO2 storage tank (1) and passes through the CO2 gas introduction pipe (2), and then enters the CO2 hydrate generation tank (10) from the top through the first branch pipe (2a) and the second branch pipe (2b); at the same time, after being connected to the gas separation device (19) through the third branch pipe (2c), it is divided into two branches and respectively connected to the first gas generator (20) and the second gas generator (24), and enters the CO2 hydrate generation tank (10) from the bottom of the inner side; At the same time, the scraper motor (6) is started to drive the scraper (11) to stir the CO2 hydrate formation promoter, thereby promoting full contact and mixing between CO2 and the CO2 hydrate formation promoter, and promoting the formation of CO2 hydrate; Control the pressure and temperature, absorb cold energy to generate CO2 hydrate, until the cold storage capacity in the tank reaches the maximum; In the cooling release stage: the scraper motor (6) drives the scraper (11) to scrape off the CO2 hydrate solids fixed on the wall of the CO2 hydrate generation tank (10); the screw feeding motor (18) is started to drive the screw feeder (21) to send the CO2 hydrate solids to the cooling release coil (27) for heat exchange and decomposition to release cooling energy; the user water pipe (38) and the cooling release coil (27) are started to release cooling energy to the user who needs cooling energy (39); CO2 capture and promoter recovery: the CO2 hydrate slurry that is not decomposed in the cooling stage enters the CO2 capture and promoter recovery tank (33), and the hydrate generation promoter passes through the CO2 hydrate solid filter (34) and enters the bottom of the CO2 capture and promoter recovery tank (33), and is then transported back to the CO2 hydrate generation tank (10) through the CO2 hydrate promoter recovery pipe (32) at the bottom outside the tank; The CO2 gas is transported to the CO2 storage tank (1) through the CO2 recovery pipe (35) on the top of the CO2 capture and promoter recovery tank (33) for the next cycle.

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