A double vortex tube organic rankine cycle system recycling waste heat and pressure

Abstract

The application provides a double vortex tube organic Rankine cycle system for recycling waste heat and pressure, which uses waste heat and pressure air as a heat source to provide heat for an evaporator A, and after heat exchange, the air enters a vortex tube D to be separated into cold and hot air with different pressures, the hot air provides heat for an evaporator B, and after heat release, the pressure of the hot air is used to drive a pneumatic booster pump to compress an organic working medium; and the cold air is used as a cold source of an air cooler to cool the organic working medium, so that energy cascade utilization is realized. After the turbine does work for the first time, the exhaust gas enters a vortex tube C to be separated into cold and hot air streams, the cold air stream has small temperature and flow rate and is used to enter the air cooler, so that the system condensing heat loss is reduced; and the heat of the hot air stream is used for a secondary cycle, the organic working medium is compressed by the pneumatic booster pump and mixed with the working medium flowing out of the evaporator B to form high-temperature and high-pressure working medium, and then the working medium enters the turbine to do work again, so that the overall work of the system is increased and the heat loss of the system is reduced.

Description

Technical Field

[0001] This invention belongs to the field of low-grade energy utilization technology, and relates to a dual-vortex tube organic Rankine cycle power generation system for recovering waste heat and pressure. Background Technology

[0002] Compressed air energy storage technology boasts advantages such as long operational lifespan, large storage capacity, and strong environmental friendliness, making it widely applicable in large-scale power distribution and renewable energy sectors. However, after energy release, the energy storage system still retains residual heat and pressure that cannot be fully utilized, reducing the efficiency of compressed air energy storage power plants. Therefore, finding ways to fully and rationally utilize this residual heat and pressure is crucial for improving the overall efficiency of compressed air energy storage power plants and reducing operating costs.

[0003] Organic Rankine cycle (ORC) power generation technology can convert low-grade energy into high-grade electrical energy, but the system's heat-to-work conversion efficiency is relatively low, and a large amount of waste heat is lost to the air in the form of condensation heat. Therefore, it is necessary to design an ORC system that efficiently recovers waste heat and pressure while reducing condensation heat emissions. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides an organic Rankine cycle power generation system that utilizes energy in a cascade manner, increases the overall output power of the system, and reduces system heat loss.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A dual-vortex tube organic Rankine cycle system for recovering waste heat and pressure comprises an evaporator A, an evaporator B, a turbine, a generator, vortex tubes C and D, a gas booster pump, an air cooler, a working fluid mixer, a working fluid pump, a working fluid storage tank, valves E, F, and G. The working fluid storage tank is connected to the working fluid pump via a pipe with valve G. The working fluid pump is connected to the working fluid inlet of evaporator A via a pipe with valve E. The working fluid outlet of evaporator A is connected to the turbine inlet. The turbine is coaxially connected to the generator. The turbine outlet is connected to the inlet of vortex tube C. The cold end outlet of vortex tube C is connected to the working fluid inlet of the air cooler. The working fluid outlet of the air cooler is connected to the working fluid pump. The working fluid pump is connected to the working fluid inlet of evaporator B via a pipe with valve F. The working fluid outlet of evaporator B is connected to the inlet of the working fluid mixer. The hot end outlet of vortex tube C is connected to the booster inlet of a gas booster pump. The booster outlet of the gas booster pump is connected to the inlet of the working fluid mixer. The outlet of the working fluid mixer is connected to the turbine. Waste heat and pressure air flows in through the heat source inlet of evaporator A. The heat source outlet of evaporator A is connected to the inlet of vortex tube D. The hot end outlet of vortex tube D is connected to the heat source inlet of evaporator B. The heat source outlet of evaporator B is connected to the drive gas inlet of the gas booster pump. The cold end outlet of vortex tube D is connected to the cold source inlet of the air cooler.

[0007] Furthermore, the temperature of the waste heat and pressure air is between 90 and 150°C, and the pressure is between 0.5 and 1 MPa.

[0008] Furthermore, valves G and E are opened, and valve F is closed. The organic working fluid flows from the working fluid storage tank into the working fluid pump for pressurization and then into the evaporator A. After exchanging heat with the waste heat and pressure air, it becomes superheated steam and enters the turbine, driving the generator to generate electricity for the first time.

[0009] Furthermore, the exhaust gas from the turbine outlet enters the vortex tube C, expands, and rotates at high speed, causing the exhaust gas to separate into two parts with different pressures and temperatures from the center of the vortex to the outer wall. The airflow at the center is colder, while the airflow at the outer edge is hotter. Therefore, the exhaust gas at the center of the vortex flows out from the cold end of the vortex tube C, and the exhaust gas at the outer edge of the vortex flows out from the hot end of the vortex tube C, and the ratio of cold to hot flow is adjustable. After the waste heat and pressure air undergoes its first heat exchange in the evaporator A, it enters the vortex tube D, forming two airflows of different temperatures using the same principle described above.

[0010] Furthermore, the exhaust working fluid flowing out from the cold end of the vortex tube C enters the air cooler and exchanges heat with the cold air in the vortex tube D, and is cooled into a liquid working fluid that flows out of the air cooler.

[0011] Furthermore, valve F is opened, and valves E and G are closed. The liquid working fluid flowing out of the air cooler enters the evaporator B through the working fluid pump to absorb the heat of the air at the hot end of the vortex tube D, and evaporates a second time into a high-temperature and high-pressure gaseous working fluid, which then flows into the working fluid mixer.

[0012] Furthermore, after a second heat exchange between the air at the hot end of the vortex tube D and the evaporator B, the air enters the large piston of the pneumatic booster pump as the driving gas; the organic working fluid at the hot end of the vortex tube C enters the small piston of the pneumatic booster pump as the compressed gas. The large and small pistons of the pneumatic booster pump are coaxially connected. The residual air pressure drives the large piston of the pneumatic booster pump, which in turn drives the small piston to compress the organic working fluid. This process repeats until the organic working fluid is pressurized to a set pressure. Subsequently, the organic working fluid flows into the working fluid mixer, and the residual heat and pressure air is discharged into the atmosphere.

[0013] Furthermore, the set pressure of the organic working fluid in the pneumatic booster pump is the same as the working fluid pressure of the secondary evaporation in the evaporator B. Then, the two are mixed in the working fluid mixer to form a high-temperature and high-pressure gas, which enters the turbine to do work and drive the generator to generate electricity for the second time.

[0014] The beneficial effects of this invention are:

[0015] (1) Waste heat and pressure air is used as the initial heat source to provide heat to evaporator A. After the heat is released, hot air and cold air with different pressures are generated through vortex tube D. The hot air provides heat to evaporator B again. After heat exchange, the pressure of the hot air is used to drive the pneumatic booster pump to boost the pressure of the organic working fluid. The cold air is used as the cold source of the air cooler to cool the organic working fluid, realizing the energy cascade utilization.

[0016] (2) After the high-temperature and high-pressure organic working fluid does work in the turbine for the first time, the exhaust gas enters the vortex tube C and is separated into two types of airflow: cold and hot. The cold airflow entering the air cooler has a smaller temperature and flow rate, which reduces the heat loss of the system during condensation. The heat of the hot airflow is used for secondary circulation. After being compressed by the pneumatic booster pump, it mixes with the working fluid flowing out of the evaporator B to form a high-temperature and high-pressure working fluid, which enters the turbine again to do work, increasing the overall work done by the system while reducing the heat loss of the system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a dual-vortex tube organic Rankine cycle system for recovering waste heat and pressure according to the present invention.

[0018] In the diagram: 1-Working fluid storage tank; 2-Valve G; 3-Working fluid pump; 4-Valve E; 5-Evaporator A; 6-Turbine; 7-Generator; 8-Vortex tube C; 9-Vortex tube D; 10-Air cooler; 11-Valve F; 12-Evaporator B; 13-Pneumatic booster pump; 14-Working fluid mixer. Implementation

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

[0020] like Figure 1 As shown, the present invention is a double vortex tube organic Rankine cycle system for recovering waste heat and pressure. The system consists of a working fluid storage tank (1), valve G (2), working fluid pump (3), valve E (4), evaporator A (5), turbine (6), generator (7), vortex tube C (8), vortex tube D (9), air cooler (10), valve F (11), evaporator B (12), gas booster pump (13), and working fluid mixer (14). The working fluid storage tank (1) is connected to the working fluid pump (3) through a pipe with valve G (2). The working fluid pump (3) is connected to the working fluid inlet of evaporator A (5) through a pipe with valve E (4). The working fluid outlet of evaporator A (5) is connected to the inlet of turbine (6). Turbine (6) is coaxially connected to generator (7). The outlet of turbine (6) is connected to the inlet of vortex tube C (8). The cold end outlet of vortex tube C (8) is connected to the working fluid inlet of air cooler (10). The working fluid outlet of air cooler (10) is connected to the working fluid pump (3). The working fluid pump (3) is connected to the working fluid inlet of the evaporator B (12) through a pipe with valve F (11). The working fluid outlet of the evaporator B (12) is connected to the inlet of the working fluid mixer (14). The hot end outlet of the vortex tube C (8) is connected to the pressurization inlet of the gas booster pump (13). The pressurization outlet of the gas booster pump (13) is connected to the inlet of the working fluid mixer (14). The outlet of the working fluid mixer (14) is connected to the turbine (6). Waste heat and waste pressure air flows in through the heat source inlet of the evaporator A (5). The heat source outlet of the evaporator A (5) is connected to the inlet of the vortex tube D (9). The hot end outlet of the vortex tube D (9) is connected to the heat source inlet of the evaporator B (12). The heat source outlet of the evaporator B (12) is connected to the driving gas inlet of the gas booster pump (13). The cold end outlet of the vortex tube D (9) is connected to the cold source inlet of the air cooler (10).

[0021] Open valves G (2) and E (4), close valve F (11), and the liquid organic working fluid flows from the working fluid storage tank (1) into the working fluid pump (3). After being pressurized, it flows into the evaporator A (5) to exchange heat with the waste heat and pressure air heat source with a temperature of 90~150℃ and a pressure of 0.5~1 MPa. After absorbing heat, the liquid organic working fluid becomes superheated vapor and enters the turbine (6) to do work, driving the generator (7) to generate electricity for the first time.

[0022] After the residual heat and pressure of the air exchange heat with the organic working fluid, the temperature decreases while the pressure remains at the initial residual pressure. It then enters the vortex tube D(9), expands, and rotates at high speed, causing the gas to separate into two airflows with different pressures and temperatures from the center of the vortex to the outer wall. The airflow at the center of the vortex has a lower pressure and temperature, with a temperature between -10 and -35°C and a pressure slightly higher than atmospheric pressure. Meanwhile, the airflow at the outer edge of the vortex has a higher temperature, between 120 and 160°C, and its pressure is lower than the initial residual pressure of the air at the inlet of the vortex tube D(9), but higher than the pressure of the airflow at the cold end outlet of the vortex tube D(9). Furthermore, the ratio of hot to cold air flowing out of the vortex tube D(9) is adjustable, and the temperature difference is determined by the pressure of the initial heat source, achieving optimal cooling and heating effects. Therefore, the cold air at the center of the vortex flows out from the cold end of the vortex tube D(9), while the hot air at the outer edge of the vortex flows out from the hot end of the vortex tube D(9).

[0023] After the turbine (6) has done work, the exhaust gas temperature is in the range of 58~80℃ and the pressure is in the range of 0.2~0.5 MPa. It is separated into two gaseous working fluids, cold and hot, by the vortex tube C (8). The pressure of the cold gas is the same as the atmospheric pressure and the temperature is about 42℃; the pressure of the hot gas is between 0.15~0.45 MPa and the temperature is between 68~182℃. The hot gas enters the pneumatic booster pump (13) for compression; the cold gas enters the air cooler (10) and is cooled into a liquid state by the cold air flowing out of the cold end of the vortex tube D (9). The cold air is discharged into the atmosphere after sufficient heat exchange with the working fluid.

[0024] At this time, open valve F (11), close valve G (2) and valve E (4), the liquid working fluid flows back to the working fluid pump (3) to increase pressure, and then flows into the evaporator B (12) to absorb the heat of the hot air flowing out of the vortex tube D (9) to form superheated steam, which enters the working fluid mixer (14).

[0025] After the hot air undergoes heat exchange in evaporator B (12), its temperature decreases, but it still retains a certain pressure. Therefore, the air flowing out of evaporator B (12) enters the large piston of the pneumatic booster pump (13) as the driving gas, while the hot air flowing out of vortex tube C (8) enters the small piston of the pneumatic booster pump (13) as the compressed gas. The large and small pistons of the pneumatic booster pump (13) are coaxially connected. The residual pressure air drives the large piston to move, which in turn drives the small piston to compress the hot air working fluid generated by vortex tube C (8). This process repeats until the hot air working fluid is pressurized to a set pressure, which is the same as the working fluid evaporation pressure of evaporator B (12). Subsequently, the hot air working fluid flows into the working fluid mixer (14), while the residual pressure air in the large piston is discharged into the atmosphere.

[0026] The superheated steam entering the working fluid mixer (14) mixes with the compressed hot gas working fluid to form a high-temperature and high-pressure superheated working fluid, which then enters the turbine (6) to do work, driving the generator (7) to generate electricity for the second time.

[0027] In summary, this invention proposes a double vortex tube organic Rankine cycle system for recovering waste heat and pressure. Waste heat and pressure air is used as the initial heat source to provide heat to evaporator A (5). After heat release, it is separated into hot air and cold air at different pressures through vortex tube D (9). The hot air provides heat to evaporator B (12) again. After heat exchange, the pressure of the hot air is used to drive the pneumatic booster pump (13) to boost the pressure of the circulating working fluid. Meanwhile, the cold air is used as the cold source of the air cooler (10) to cool the organic working fluid, thereby realizing the cascade utilization of energy.

[0028] After the high-temperature and high-pressure organic working fluid performs its first work in the turbine, the exhaust gas enters the vortex tube C (8) and is separated into two types of airflow: cold and hot. The cold airflow entering the air cooler (10) has a smaller temperature and flow rate, reducing the system's condensation heat loss. The hot airflow is compressed by the pneumatic booster pump (13) and mixes with the working fluid flowing out of the evaporator B (12) to form a high-temperature and high-pressure working fluid, which then enters the turbine (6) again to perform its work, increasing the overall work done by the system while reducing the system's heat loss.

[0029] Although specific embodiments of the invention have been shown and described, the scope of protection of the invention is not limited thereto. It will be understood by any person skilled in the art that various changes, modifications, substitutions, and variations can be made to the embodiments without departing from the principles and spirit of the invention. Therefore, the scope of protection of the invention should be determined by the scope of the claims.

Claims

1. A dual-vortex tube organic Rankine cycle system for recovering waste heat and pressure, characterized in that: It consists of evaporator A, evaporator B, turbine, generator, vortex tube C, vortex tube D, gas booster pump, air cooler, working fluid mixer, working fluid pump, working fluid storage tank, valve E, valve F, and valve G. The working fluid storage tank is connected to the working fluid pump via a pipe with valve G. The working fluid pump is connected to the working fluid inlet of evaporator A via a pipe with valve E. The working fluid outlet of evaporator A is connected to the turbine inlet. The turbine is coaxially connected to the generator. The turbine outlet is connected to the inlet of vortex tube C. The cold end outlet of vortex tube C is connected to the working fluid inlet of the air cooler. The working fluid outlet of the air cooler is connected to the working fluid pump. The working fluid pump... A pipe with valve F is connected to the working fluid inlet of evaporator B. The working fluid outlet of evaporator B is connected to the working fluid mixer inlet. The hot end outlet of vortex tube C is connected to the booster gas inlet of a gas booster pump. The booster outlet of the gas booster pump is connected to the working fluid mixer inlet. The working fluid mixer outlet is connected to the turbine. Waste heat and pressure air flows in through the heat source inlet of evaporator A. The heat source outlet of evaporator A is connected to the vortex tube D inlet. The hot end outlet of vortex tube D is connected to the heat source inlet of evaporator B. The heat source outlet of evaporator B is connected to the drive gas inlet of the gas booster pump. The cold end outlet of vortex tube D is connected to the cold source inlet of the air cooler.

2. The dual-vortex tube organic Rankine cycle system for recovering waste heat and pressure according to claim 1, characterized in that: Waste heat and pressure air serves as the initial heat source, with a temperature between 90 and 150°C and a pressure between 0.5 and 1 MPa. After the waste heat and pressure air undergoes its first heat exchange in the evaporator A, it enters the vortex tube D and is separated into cold and hot air at different pressures. The cold air serves as the cold source of the air cooler to cool the organic working fluid. The hot air serves as the heat source of the evaporator B and exchanges heat with the organic working fluid again. After the heat exchange, the residual pressure is used again to drive the gas booster pump.

3. The dual-vortex tube organic Rankine cycle system for recovering waste heat and pressure according to claim 2, characterized in that: Open valves G and E, close valve F, and the organic working fluid flows from the working fluid storage tank into the working fluid pump. After being pressurized, it flows into the evaporator A, where it exchanges heat with the waste heat and pressure of the initial heat source air and becomes superheated steam. It then enters the turbine and drives the generator to generate electricity for the first time.

4. The dual-vortex tube organic Rankine cycle system for recovering waste heat and pressure according to claim 3, characterized in that: The exhaust gas from the turbine outlet enters the vortex tube C and is separated into two parts of hot and cold air with different pressures and temperatures. The cold air enters the air cooler and exchanges heat with the cold air flowing out of the vortex tube D, and is cooled into a liquid state. The valve F is opened and the valves E and G are closed. The liquid working fluid is pressurized by the working fluid pump and flows into the evaporator B, where it absorbs the heat from the hot air flowing out of the vortex tube D and becomes high-temperature, high-pressure superheated steam, which then enters the working fluid mixer.

5. The dual-vortex tube organic Rankine cycle system for recovering waste heat and pressure according to claim 4, characterized in that: The organic working fluid flowing out from the hot end of the vortex tube C enters the small piston of the gas booster pump as the compressed gas. The hot air generated by the vortex tube D exchanges heat with the evaporator B and then enters the large piston of the gas booster pump as the driving gas. The large and small pistons of the gas booster pump are coaxially connected. The residual pressure of the hot air pushes the large piston, which in turn drives the small piston to compress the organic working fluid. This process is repeated until the organic working fluid is pressurized to the set pressure. Subsequently, the organic working fluid flows into the working fluid mixer, and the residual heat and pressure air is discharged into the atmosphere.

6. The dual-vortex tube organic Rankine cycle system for recovering waste heat and pressure according to claim 5, characterized in that: The organic working fluid is set at the same pressure as the working fluid pressure during secondary evaporation in the evaporator B. The two are then mixed in the working fluid mixer to form a high-temperature, high-pressure gas, which enters the turbine and drives the generator to generate electricity for the second time.

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