Energy storage type hot and cold air system transformed based on air compressor and using method

Abstract

The invention relates to an energy storage type hot and cold air system improved based on an air compressor and a using method, and belongs to the technical field of heating and refrigerating equipment. The system comprises an air compressor assembly, a pressure air storage device, a constant pressure air storage device, a vortex tube unit, an air cooler and an air heater; a compressed air outlet in the air compressor assembly is communicated with the pressure air storage device, the pressure air storage device is communicated with the constant-pressure air storage device, and the constant-pressure air storage device is communicated with the vortex tube unit. The other end of the vortex tube unit is connected with the hot air collecting tube; the air compressor assembly is provided with a heat insulation enclosure shell, and a fresh air fan is installed on the heat insulation enclosure shell. The system has the energy storage characteristic, solves the wind and light abandoning problem of unstable natural energy, utilizes valley electricity to avoid peaks, obtains cheap energy, can be widely applied to the drying industry, building heating and ventilation, energy construction and hot air and cold air supply centers, and achieves the good effects of energy conservation, cost reduction and emission reduction.

Description

Technical Field

[0001] The present invention relates to an energy storage type hot and cold air system based on air compressor transformation and a use method thereof, belonging to the technical field of heating and cooling equipment. Background Art

[0002] When an air compressor compresses air, the gaps between molecules decrease, and the electron potential energy is converted into kinetic energy through heat release. This internal heat is considered internal energy and has a coefficient of performance (COP) of approximately 0.85. Heat recovery during air compressor operation has been applied in some energy-saving and emission-reduction scenarios. However, if used as a heating device, the COP is 0.85, which is lower than the COP of 3.0 for water- and air-source heat pumps.

[0003] According to the first law of thermodynamics, energy can neither be created nor destroyed; it can only be converted between different forms. Compressed air, as a form of energy storage, can be used for compressed air power generation and compressed air engines. However, when compressed air is separated into hot and cold air through a vortex tube, the energy efficiency is relatively low and the practicality is limited if only one form of cooling or heating is required. Summary of the Invention

[0004] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an energy storage type hot and cold air system based on air compressor modification and a method of use, which has a high energy efficiency ratio, energy storage characteristics, and strong practicality.

[0005] The energy storage type hot and cold air system based on air compressor transformation described in the present invention includes an air compressor assembly, a pressure air storage device, a constant pressure air storage device, a vortex tube unit, a cold air blower and a hot air blower;

[0006] The compressed air outlet on the air compressor assembly is connected to the inlet of the pressure air storage device through a pipeline, the outlet of the pressure air storage device is connected to the inlet of the constant pressure air storage device through a pipeline, and the outlet of the constant pressure air storage device is connected to the inlet of the vortex tube unit through a pipeline; the vortex tube unit is provided with a vortex tube, one end of the vortex tube unit is connected to the cold air collection pipe, and the other end is connected to the hot air collection pipe, the cold air collection pipe is connected to the cold air blower, and the hot air collection pipe is connected to the hot air blower; the cold air blower and the hot air blower are both connected to the user end;

[0007] The air compressor assembly is provided with an insulated enclosure shell, the insulated enclosure shell is provided with a fresh air inlet, and the insulated enclosure shell is also equipped with a fresh air fan. The air inlet of the fresh air fan is connected to the internal area of ​​the insulated enclosure shell, and the air outlet of the fresh air fan is connected to the end of the hot air collecting pipe and the hot air fan through a three-way pipeline.

[0008] Preferably, a pressure regulating solenoid valve and a pressure gauge are installed on the connecting pipe between the pressure air storage device and the constant pressure air storage device; an air valve A is installed on the connecting pipe between the constant pressure air storage device and the vortex tube unit; an air valve B and an air valve C are installed on the connecting pipe between the fresh air fan and the hot air collecting pipe, and an air valve D is also installed on the connecting pipe between the fresh air fan and the hot air blower.

[0009] Preferably, an air compressor is installed inside the thermally insulated enclosure, and the air compressor is a centrifugal air compressor, a screw air compressor, a scroll air compressor, or an axial flow air compressor.

[0010] Preferably, the number of the air compressor assemblies is one or more connected in parallel; the number of the pressurized air storage devices can be one or more connected in parallel, and the number of the constant pressure air storage devices can be one or more connected in parallel.

[0011] Preferably, the pressure air storage device and the constant pressure air storage device are one of an above-ground storage tank or an underground gas storage well.

[0012] Furthermore, when the pressurized air storage device and the constant pressure air storage device are above-ground storage tanks, a solar heat-absorbing coating is coated on the surface of the tank body, and a transparent enclosure material is installed on the surface of the solar heat-absorbing coating, so that the tank body absorbs solar heat to accelerate the temperature rise of the gas in the tank.

[0013] The method for using the energy storage type hot and cold air system based on air compressor modification described in the present invention comprises the following steps:

[0014] S1, first route: converting compressed air into hot and cold air through a vortex tube unit, said S1 includes:

[0015] S11. Turn on the air compressor, and the compressed air is discharged through the compressed air outlet of the air compressor assembly and enters the compressed air storage device through the pipeline;

[0016] S12, the compressed air in the pressure air storage device is adjusted to a suitable pressure value by the pressure regulating solenoid valve and then enters the constant pressure air storage device;

[0017] S13. The constant-pressure gas in the constant-pressure air storage device then passes through the pipeline and valve A and enters the vortex tube unit. After the hot and cold separation function of the vortex tube, it is divided into cold air and hot air. The cold air enters the cold air collecting pipe through the cold end of the vortex tube and is transported to the cold air user end through the cold air blower; the hot air enters the hot air collecting pipe through the hot end of the vortex tube and is transported to the hot air user end through the hot air blower.

[0018] S2, the second route: recycling the internal energy heat, electromagnetic heat of the motor and mechanical friction heat generated when the air compressor assembly is working, said S2 includes:

[0019] S21. The internal energy heat, mechanical friction heat, and electromagnetic heat generated by the motor when the air compressor assembly is working are exchanged through the cooling system of the air compressor assembly;

[0020] S22. The fresh air fan starts, and the fresh air enters the thermally insulated enclosure through the fresh air inlet. It then exchanges heat with the cooling system of the air compressor assembly to become hot air. The air is then merged into the end of the hot air collecting duct through the pipeline, and finally transported to the hot air user end by the hot air blower.

[0021] Preferably, the hot air generated in step S2 is synchronized with the start-up of the air compressor. Hot air is generated when the air compressor is turned on, and the hot air stops when the air compressor is stopped. The hot air and cold air generated in step S1 can be synchronized or asynchronous with the start-up of the air compressor, and can work normally even when the air compressor is stopped.

[0022] Furthermore, in step S1, the air compressor can be started during the off-peak period to store compressed air energy and store the compressed air in a compressed air storage device; after entering the off-peak period, the air compressor is turned off to save energy costs.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The energy storage hot and cold air system based on air compressor transformation and the use method described in the present invention start the air compressor during off-peak hours to store compressed air energy, and output the hot air directly generated by the operation of the air compressor to the outside through the second route; during non-off-peak hours, the air compressor is shut down, and the hot and cold air separated by the vortex tube unit on the first route is output to meet the needs of the user end; the present invention has energy storage characteristics, solves the problem of wind and solar power abandonment caused by unstable natural energy, utilizes off-peak electricity to avoid peak, and obtains cheap energy; the present invention can be widely used in the drying industry, building HVAC, construction energy, and hot and cold air supply centers, achieving good results in energy saving, cost reduction and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the working principle of Example 1 of the present invention;

[0026] Figure 2 It is a structural diagram of the air compressor assembly;

[0027] Figure 3 is a front view of the pressurized air storage device in Example 1 of the present invention;

[0028] Figure 4 is a top view of the pressurized air storage device in Example 1 of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the pressure air storage device and the constant pressure air storage device in Example 2 of the present invention.

[0030] In the figure: 1. Air compressor assembly; 2. Fresh air fan; 3. Pressurized air storage device; 4. Pressure gauge; 5. Pressure regulating solenoid valve; 6. Constant pressure air storage device; 7. Air valve A; 8. Cold air collecting duct; 9. Vortex tube unit; 10. Hot air collecting duct; 11. Air valve C; 12. Air valve D; 13. Hot air blower; 14. Cold air blower; 15. Air valve B; 16. Insulated enclosure shell; 17. Fresh air inlet; 18. Transparent enclosure material; 19. Solar heat-absorbing coating. DETAILED DESCRIPTION

[0031] Example 1

[0032] like Figure 1-4 As shown, this embodiment is implemented through the following technical solutions: including an air compressor assembly 1, a pressure air storage device 3, a constant pressure air storage device 6, a vortex tube unit 9, a cold air blower 14 and a hot air blower 13; the pressure air storage device 3 is used to store the compressed air generated by the air compressor assembly 1, and the volume and pressure of the pressure air storage device 3 determine the amount of stored energy; the constant pressure air storage device 6 is used to provide stable constant pressure compressed gas to the vortex tube unit 9.

[0033] The compressed air outlet on the air compressor assembly 1 is connected to the inlet of the pressure air storage device 3 through a pipeline, the outlet of the pressure air storage device 3 is connected to the inlet of the constant pressure air storage device 6 through a pipeline, and the outlet of the constant pressure air storage device 6 is connected to the inlet of the vortex tube unit 9 through a pipeline; the vortex tube unit 9 is provided with a vortex tube, the material of the vortex tube is SUS304 stainless steel, and the hot and cold air ratio can be adjusted by a regulating valve on the vortex tube; one end of the vortex tube unit 9 is connected to the cold air collecting pipe 8, and the other end is connected to the hot air collecting pipe 10, the cold air collecting pipe 8 is connected to the cold air fan 14, and the hot air collecting pipe 10 is connected to the hot air fan 13; the cold air fan 14 and the hot air fan 13 are both connected to the user end;

[0034] The air compressor assembly 1 is provided with an insulated enclosure 16, which prevents heat generated by the air compressor from dissipating into the environment and reduces noise. The insulated enclosure 16 is constructed of a metal plate or composite material, with an interior composed of organic foam or inorganic fiber materials such as PU, XPS, EPS, glass wool, or aluminum silicate. A fresh air inlet 17 is provided on the insulated enclosure 16, which also houses a fresh air blower 2. The air inlet of the fresh air blower 2 communicates with the interior of the insulated enclosure 16, and the air outlet of the fresh air blower 2 communicates with the end of the hot air collecting duct 10 and the hot air blower 13 via a three-way pipe.

[0035] In this embodiment, a pressure-regulating solenoid valve 5 and a pressure gauge 4 are installed on the connecting pipe between the pressure air storage device 3 and the constant-pressure air storage device 6, and the pressure-regulating solenoid valve 5 is used to make the air pressure entering the constant-pressure air storage device 6 reach the optimal pressure value required by the vortex tube unit 9; an air valve A7 is installed on the connecting pipe between the constant-pressure air storage device 6 and the vortex tube unit 9; an air valve B15 and an air valve C11 are installed on the connecting pipe between the fresh air fan 2 and the hot air collecting pipe 10, and an air valve D12 is also installed on the connecting pipe between the fresh air fan 2 and the hot air blower 13.

[0036] An air compressor is installed inside the thermally insulated enclosure 16, and the air compressor is a screw air compressor. The number of the air compressor assemblies 1 is three in parallel; the number of the pressurized air storage devices 3 is four in parallel, and the number of the constant-pressure air storage devices 6 is four in parallel. The pressurized air storage devices 3 and the constant-pressure air storage devices 6 are above-ground storage tanks made of carbon steel. The outer surface of the storage tank is coated with a solar heat-absorbing coating 19, which is a titanium nano-silicon titanium coating. The solar heat-absorbing coating 19 absorbs solar heat to accelerate the temperature rise of the gas in the tank. The outer surface of the solar heat-absorbing coating 19 is installed with a transparent enclosure material 18, which is a three-layer hollow solar panel made of PC and PVC.

[0037] Example 2

[0038] like Figure 5 As shown, in this embodiment, the pressurized air storage device 3 and the constant pressure air storage device 6 are underground gas storage wells, which have the characteristics of constant temperature throughout the four seasons, do not occupy ground space, and have a large gas storage capacity; the underground gas storage well can be a metal tank installed underground, or it can be constructed by digging underground space and using civil engineering techniques such as concrete casting, or it can be converted from an underground mine into an underground gas storage.

[0039] The other structures of Example 2 are the same as those of Example 1.

[0040] Example 3

[0041] The method for using the energy storage type hot and cold air system based on air compressor modification described in this embodiment includes the following steps:

[0042] S1, first route: converting compressed air into hot and cold air through the vortex tube unit 9, said S1 includes:

[0043] S11, turning on the air compressor, the compressed air is discharged through the compressed air outlet of the air compressor assembly 1, and enters the compressed air storage device 3 through the pipeline;

[0044] S12, the compressed air in the pressure air storage device 3 is adjusted to a suitable pressure value by the pressure regulating solenoid valve 5, and then enters the constant pressure air storage device 6;

[0045] S13, the constant pressure gas in the constant pressure air storage device 6 then passes through the pipeline and the air valve A7 and enters the vortex tube unit 9. After the hot and cold separation function of the vortex tube, it is divided into cold air and hot air. The cold air enters the cold air collecting pipe 8 through the cold end of the vortex tube and is transported to the cold air user end through the cold air blower 14; the hot air enters the hot air collecting pipe 10 through the hot end of the vortex tube and is transported to the hot air user end through the hot air blower 13.

[0046] S2, the second route: recycling the internal energy heat, electromagnetic heat of the motor and mechanical friction heat generated when the air compressor assembly 1 is working, said S2 includes:

[0047] S21, the internal energy heat, mechanical friction heat, and electromagnetic heat generated by the motor generated by the air compressor assembly 1 during operation are exchanged through the cooling system of the air compressor assembly 1;

[0048] S22, the fresh air blower 2 is started, and the fresh air enters the thermally insulated enclosure 16 through the fresh air inlet 17, and then exchanges heat with the cooling system of the air compressor assembly 1 to become hot air, which is then merged into the end of the hot air collecting pipe 10 through the pipeline, and finally transported to the hot air user end by the hot air blower 13.

[0049] The hot air generated in step S2 is synchronized with the start-up of the air compressor. Hot air is generated when the air compressor is turned on and the hot air stops when the air compressor is stopped. The hot air and cold air generated in step S1 can be synchronized or asynchronous with the start-up of the air compressor and can work normally even when the air compressor is stopped.

[0050] In step S1, the air compressor can be started during the off-peak period to store compressed air energy in the compressed air storage device 3; after entering the off-peak period, the air compressor is turned off to save energy costs.

[0051] Example 4

[0052] Analysis of the energy efficiency ratio (COP) and cooling energy efficiency ratio (EER) of the energy storage type hot and cold air system based on air compressor transformation:

[0053] In the first route of step S1, the thermal energy efficiency ratio COP and the cooling energy efficiency ratio EER generated by the energy storage compressed air are combined with the implementation instructions:

[0054] Taking the screw air compressor as an example, the parameters are as follows:

[0055] Power 110kW, gas volume 15m 3 / min, fuel consumption 88kW, fuel injection volume 150L / min, exhaust pressure 1.0Mpa, exhaust volume 900m per hour 3 / h, equivalent to 8883m3 in the environment 3 (cold and hot air volume); at room temperature 20 ℃, 40% of the -30 ℃ cold air 3553m can be separated through the vortex tube unit 9 3, and 60% of 105℃ hot air 5330m 3 .

[0056] Cooling air energy calculation:

[0057] 3553m 3 ×1.29kg / m 3 =4583kg(air density is 1.29kg / m 3 );

[0058] 4583kg×1.005kJ / (kg·℃)×50℃=230296kJ;

[0059] Converted to kWh (1kWh = 3600kJ): 230296 ÷ 3600 ≈ 64kWh;

[0060] That is, the cooling capacity separated by the vortex tube is equivalent to 64kWh.

[0061] Hot air energy calculation:

[0062] 5330m 3 ×1.29kg / m 3 =6876kg;

[0063] 6876kg×1.005kJ / (kg·℃)×85℃=587382kJ;

[0064] Converted to kWh: 587382 ÷ 3600 ≈ 163 kWh;

[0065] The energy of hot and cold separation in the vortex tube is equivalent to 64kWh + 163kWh = 227kWh;

[0066] The energy efficiency ratio EER+COP of the vortex tube unit 9 is: 227÷110=2.06.

[0067] In step S2, the second route:

[0068] The COP of internal energy heat generated by the air compressor is about 0.85;

[0069] The electromagnetic heat generated by the motor (accounting for 8%-20%) has a COP of approximately 0.135;

[0070] Other comprehensive mechanical friction heat, COP is about 0.1;

[0071] Therefore, for the heat generated by the air compressor alone, COP ≥ 1.0.

[0072] In summary, the total energy efficiency ratio of this embodiment = 2.06 + 1.0 ≥ 3.0. The present invention not only has a high energy efficiency ratio, but also has market competitiveness and practicality due to its energy storage characteristics. It is particularly suitable for building large-scale energy centers and application scenarios that use both hot air and cold air, such as the food processing industry, which has both drying and refrigeration, which requires cold air; or cooling air conditioning in offices, residences, and workshops.

[0073] The practicality of the present invention is described with reference to the following embodiments:

[0074] For example, the peak-valley period in a certain area is from 11:00 to 14:00 noon, and the electricity price during the deep valley period is 0.25 yuan / kWh; from 23:07, the electricity price during the valley period is 0.315 yuan / kWh; the average peak-valley electricity price is 0.86 yuan / kWh.

[0075] A food company needs 5000kW of drying heat per hour to dry food.

[0076] 1. Using the COP3.0 calculation of the device of the present invention and using valley electricity storage, the electricity cost for 24 hours a day is (calculated at 0.315 yuan / kWh):

[0077] 0.315×5000×24÷3=12600 yuan;

[0078] Note: The part of cooling air generated is exchanged with the conversion value.

[0079] 2. Using traditional air source heat pump equipment, the COP is calculated at 3.5, and the peak and valley power is calculated at 0.86 yuan / kWh:

[0080] 0.86×5000×24÷3.5=29485 yuan;

[0081] Compared with the traditional air source heat pump, the equipment of the present invention saves 16,885 yuan (57.2%) in daily cost (energy consumption), so it has strong market competitiveness and practicality.

Claims

1. An energy storage type hot and cold air system based on air compressor transformation, characterized in that: It comprises an air compressor assembly (1), a pressure air storage device (3), a constant pressure air storage device (6), a vortex tube unit (9), a cooling air blower (14) and a hot air blower (13); The compressed air outlet on the air compressor assembly (1) is connected to the inlet of the pressure air storage device (3) through a pipeline, the outlet of the pressure air storage device (3) is connected to the inlet of the constant pressure air storage device (6) through a pipeline, and the outlet of the constant pressure air storage device (6) is connected to the inlet of the vortex tube unit (9) through a pipeline; the vortex tube unit (9) is provided with a vortex tube, one end of the vortex tube unit (9) is connected to the cold air collecting pipe (8), and the other end is connected to the hot air collecting pipe (10), the cold air collecting pipe (8) is connected to the cold air blower (14), and the hot air collecting pipe (10) is connected to the hot air blower (13); the cold air blower (14) and the hot air blower (13) are both connected to the user end; The air compressor assembly (1) is provided with an insulating enclosure shell (16), a fresh air inlet (17) is provided on the insulating enclosure shell (16), and a fresh air blower (2) is also installed on the insulating enclosure shell (16), the air inlet of the fresh air blower (2) is connected to the internal area of ​​the insulating enclosure shell (16), and the air outlet of the fresh air blower (2) is connected to the end of the hot air collecting pipe (10) and the hot air blower (13) through a three-way pipeline.

2. The energy storage type hot and cold air system based on air compressor transformation according to claim 1 is characterized in that: A pressure regulating solenoid valve (5) and a pressure gauge (4) are installed on the connecting pipe between the pressure air storage device (3) and the constant pressure air storage device (6); an air valve A (7) is installed on the connecting pipe between the constant pressure air storage device (6) and the vortex tube unit (9); an air valve B (15) and an air valve C (11) are installed on the connecting pipe between the fresh air blower (2) and the hot air collecting pipe (10), and an air valve D (12) is also installed on the connecting pipe between the fresh air blower (2) and the hot air blower (13).

3. The energy storage type hot and cold air system based on air compressor transformation according to claim 1 is characterized in that: An air compressor is installed inside the heat-insulating enclosure (16), and the air compressor is a centrifugal air compressor, a screw air compressor, a vortex air compressor, or an axial flow air compressor.

4. The energy storage type hot and cold air system based on air compressor transformation according to claim 1 is characterized in that: The number of the air compressor components (1) is one or more connected in parallel; the number of the pressure air storage devices (3) is one or more connected in parallel; and the number of the constant pressure air storage devices (6) is one or more connected in parallel.

5. The energy storage type hot and cold air system based on air compressor transformation according to claim 4 is characterized in that: The pressure air storage device (3) and the constant pressure air storage device (6) are above-ground storage tanks, the outer surface of which is coated with a solar heat absorption coating (19), and the outer surface of the solar heat absorption coating (19) is installed with a transparent enclosure material (18).

6. The energy storage type hot and cold air system based on air compressor transformation according to claim 4 is characterized in that: The pressure air storage device (3) and the constant pressure air storage device (6) are underground gas storage wells.

7. A method for using an energy storage type hot and cold air system based on air compressor modification, using the energy storage type hot and cold air system based on air compressor modification according to claim 2, characterized in that: The following steps are involved: S1, first route: converting compressed air into hot and cold air through a vortex tube unit (9), said S1 includes: S11, turning on the air compressor, the compressed air is discharged through the compressed air outlet of the air compressor assembly (1), and enters the compressed air storage device (3) through the pipeline; S12, the compressed air in the pressure air storage device (3) is adjusted to a suitable pressure value by the pressure regulating solenoid valve (5), and then enters the constant pressure air storage device (6); S13, the constant pressure gas in the constant pressure air storage device (6) then passes through the pipeline and the air valve A (7) and enters the vortex tube unit (9). After the hot and cold separation function of the vortex tube, the gas is divided into cold air and hot air. The cold air enters the cold air collecting pipe (8) through the cold end of the vortex tube and is transported to the cold air user end through the cold air blower (14); the hot air enters the hot air collecting pipe (10) through the hot end of the vortex tube and is transported to the hot air user end through the hot air blower (13); S2, the second route: recycling the internal energy heat, electromagnetic heat of the motor and mechanical friction heat generated during the operation of the air compressor assembly (1), said S2 includes: S21, the internal energy heat, mechanical friction heat, and electromagnetic heat generated by the air compressor assembly (1) during operation are exchanged through the cooling system of the air compressor assembly (1); S22, the fresh air blower (2) is started, and the fresh air enters the heat-insulating enclosure (16) through the fresh air inlet (17), and then exchanges heat with the cooling system of the air compressor assembly (1) to become hot air, which is then merged into the end of the hot air collecting pipe (10) through the pipeline and finally transported to the hot air user end by the hot air blower (13).

8. The method for using the energy storage type hot and cold air system based on air compressor transformation according to claim 7 is characterized in that: The hot air generated in step S2 is synchronized with the start-up of the air compressor. Hot air is generated when the air compressor is turned on and the hot air stops when the air compressor is stopped. The hot air and cold air generated in step S1 can be synchronized or asynchronous with the start-up of the air compressor and can work normally even when the air compressor is stopped.

9. The method for using the energy storage type hot and cold air system based on air compressor transformation according to claim 7 is characterized in that: In step S1, the air compressor can be started during the off-peak period to store compressed air energy and store the compressed air in the compressed air storage device (3); after entering the off-peak period, the air compressor is turned off to save energy costs.

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