Energy storage power generation system and power generation method for waste heat recovery

Abstract

A power generation system and power generation method for waste heat energy recovery. The power generation system includes a gas power well (1), a piston assembly (2), a power generation device (3), a heating pipeline (4), and a gravity block (5). A solution pool (6) for containing ammonia water is set at the bottom of the gas power well. A sliding channel (7) for the piston assembly to slide back and forth is set above the solution pool. The gravity block is used to drive the power generation device to generate electricity. Ammonia gas is generated by heating the ammonia water in the solution pool through the heating pipeline. The ammonia gas pushes the piston assembly to move upward and the gravity block to move downward. After heating is stopped, the ammonia gas dissolves in the water. The piston moves downward to drive the generator to generate electricity and causes the gravity block to move upward, thereby realizing gravity energy storage.

Description

Technical Field

[0001] This invention relates to the field of energy storage power generation technology, and specifically to an energy storage power generation system and power generation method for waste heat energy recovery. Background Technology

[0002] Currently, most thermal power plants require water- or air-cooling to cool the low-temperature steam after generating electricity before returning it to the boiler for recirculation and power generation. This portion of heat that needs cooling is called waste heat. During spring, summer, and autumn, thermal power plants must treat waste heat using water or air cooling. In northern winters, while thermal power plants located near cities can utilize some waste heat for combined heat and power (CHP) to provide heating, those located far from cities still need to use water or air cooling to cool the waste heat.

[0003] In addition, in industrial parks, many enterprises need to burn boilers to meet their own production heat requirements. The flue gas emitted from the boiler chimneys is very hot, and the heat energy contained in this flue gas can only be dissipated into the atmosphere. In northern cities, boilers are needed for centralized heating in winter, and the heat of the boiler flue gas is also dissipated into the atmosphere.

[0004] The amount of heat dissipated into the atmosphere is enormous, and because the recovery rate is very low, it cannot be effectively collected and utilized.

[0005] Currently, existing technologies for waste heat energy generated in the aforementioned scenarios typically utilize heat exchange devices at the end of the exhaust system to recover sensible heat or total heat for reuse. For example, Chinese patent document CN1981122A discloses a waste heat recovery device, system, and method. This waste heat recovery device has a heat exchanger filled with reformed DME catalyst in the exhaust system of combustion devices such as furnaces, internal combustion engines, or power generation equipment. By passing a mixture of DME and water through the heat exchanger, the DME undergoes thermal decomposition, and the sensible heat of the boiler or internal combustion engine exhaust is recovered and used as hydrogen fuel.

[0006] However, in actual use, the energy recovered by the above-mentioned waste heat recovery devices has limitations, and the energy conversion lacks universal applicability.

[0007] For example, Chinese patent document CN113944521A discloses a low-temperature waste heat magnetic levitation turbine power generation system. This system mainly consists of a magnetic levitation turbine generator (unit), a cooling tower, a working fluid pump, and a heat exchanger. The cooling tower cools the vaporized working fluid into a liquid state. The working fluid pump pressurizes the liquid working fluid and pumps it into the heat exchanger. The heat exchanger vaporizes the working fluid, causing it to expand rapidly and drive the magnetic levitation turbine generator to rotate at high speed, outputting electrical energy. This power generation system maximizes the extraction of energy from the heat source, achieving zero fuel consumption, reduced heat emissions, efficient waste heat recovery, and clean power output.

[0008] Although the aforementioned low-temperature waste heat magnetic levitation turbine power generation system can convert the energy in the heat source into electrical energy, its recycling rate is difficult to meet the needs of waste heat recovery application scenarios.

[0009] In summary, how to design an energy storage and power generation device to improve the efficiency of waste heat recovery, reduce heat emissions, and increase energy utilization in the process of waste heat energy recovery has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0010] The purpose of this invention is to provide an energy storage and power generation device for the process of waste heat energy recovery, so as to improve the recovery efficiency of waste heat energy, reduce heat emissions, and improve energy utilization.

[0011] To achieve the above objectives, the present invention adopts the following solution: a storage power generation system for waste heat energy recovery is proposed, comprising a gas-powered well, a piston assembly, a power generation device, a heating pipeline, and a gravity block;

[0012] The bottom of the gas-powered well is provided with a solution pool for containing liquid medium, and a sliding channel for reciprocating sliding of the piston assembly is provided above the solution pool. The top of the gas-powered well is provided with a truss beam for supporting the piston assembly, and a pulley assembly is provided on the truss beam.

[0013] The piston assembly is located in the sliding channel. The piston assembly is connected to the truss beam by a connecting rope. One end of the connecting rope is connected to the piston assembly, and the other end of the connecting rope is connected to the gravity block through the guide of the pulley assembly. A sealing structure is provided between the piston assembly and the sliding channel.

[0014] The gravity block is used to reciprocate linearly along the axis of the gas power well as the piston assembly moves. The gravity block drives the power pulley in the pulley assembly to rotate through the connecting rope.

[0015] The power generation equipment is installed on one side of the gas power well, and the input shaft of the power generation equipment is connected to the power pulley through a transmission structure;

[0016] The heating pipeline is laid in the solution tank and is used to heat the liquid medium in the solution tank to reduce the solubility of the liquid medium in the gas. The heating pipeline has an inlet for connecting to the waste heat conveying pipeline.

[0017] Preferably, the piston assembly includes a piston block, a connecting frame, and a support roller. The support roller is mounted on the side wall of the piston block, and the piston block is connected to the inner wall of the sliding channel via the support roller. The connecting frame is fixed to the top of the piston block, and a connecting rope is connected to the connecting frame. With this configuration, the support roller provides support to the piston block within the sliding channel and reduces the friction between the piston block and the sliding channel during sliding.

[0018] Preferably, the sealing structure includes a first sealing ring and a second sealing ring, both of which are fitted onto the side wall of the piston block, forming a watertight cavity between them to accommodate water. This arrangement allows the watertight cavity to easily fill with water between the two sealing rings, forming a water ring. During the sliding of the piston assembly, the water ring completely isolates the gas inside the wellbore from the external atmosphere and prevents gas leakage. Simultaneously, the water ring also acts as a lubricant during piston movement, further reducing the friction between the piston assembly and the sliding channel.

[0019] Preferably, the piston block is equipped with a water tank to hold water, and the inner wall of the watertight cavity is provided with a connecting hole, through which the bottom of the water tank is connected to the watertight cavity. This configuration allows the water tank to store water, ensuring that the watertight cavity is always filled with water.

[0020] Preferably, a counterweight is provided on the outside of the gas-powered well to balance the weight of the piston assembly. The counterweight is connected to the piston assembly via a rope and a pulley assembly, and the weight of the counterweight is equal to the weight of the piston assembly.

[0021] Preferably, the heating pipes are arranged in a U-shape at the bottom of the solution tank. This arrangement increases the contact area between the heating pipes and the solution medium, thereby further improving heating efficiency.

[0022] Preferably, the transmission structure includes a gearbox and a drive shaft, with the output shaft of the power generation equipment connected to the drive shaft via the gearbox, and the drive shaft connected to the power pulley.

[0023] Preferably, the gravity block includes a steel plate shell with a concrete filling structure poured inside the steel plate shell.

[0024] Preferably, the liquid medium is a saturated ammonia solution.

[0025] The present invention also proposes a power generation method for the above-mentioned energy storage power generation system for waste heat energy recovery, comprising the following steps:

[0026] Saturated ammonia water is injected into the solution pool at the bottom of the gas-powered well, the piston assembly is placed at the lowest point of the sliding channel, and the gravity block is placed at the top of the gas-powered well.

[0027] Waste heat from thermal power plants and boiler chimneys is used to heat saturated ammonia water through heating pipelines. As the temperature of the ammonia water rises, the solubility of ammonia decreases, and ammonia gas overflows from the ammonia water into the gas power well. This pushes the piston assembly upward, the gravity block downward, and drives the power pulley to rotate through the connecting rope, thereby driving the power generation equipment to generate electricity.

[0028] When the temperature rises to the designed maximum temperature, the piston assembly moves to the highest position, at which point the system begins to cool down. As the system temperature decreases, the ammonia in the gas power well begins to dissolve in the water. During the process of the gas dissolving in the water, the gas pressure in the gas power well continuously decreases. Under the external atmospheric pressure of the piston assembly, the piston assembly begins to move downwards, and during the downward movement, it lifts the gravity block located at the lower position to the higher position, completing gravity energy storage.

[0029] Invention principle: By changing the solubility of gas in water through temperature changes, a negative pressure is formed in the wellbore when the gas dissolves in the water, and a positive pressure is formed in the wellbore when the gas separates from the water, which drives the piston assembly to reciprocate, thereby lifting heavy objects to store energy or directly generate electricity or output power.

[0030] Compared with existing technologies, this invention has the following outstanding substantive features and significant progress: This energy storage and power generation system for waste heat energy recovery utilizes the characteristics of gases such as ammonia and hydrogen chloride being highly soluble in water, having a large solubility, and having a solubility greatly affected by temperature. Waste heat from thermal power plants and boiler chimneys is used to heat the liquid medium in the solution pool via heating pipelines. Combined with the work done by gravity blocks, this heats the power generation equipment to generate electricity. When heating stops, the gas dissolves back into the liquid, and the change in gas pressure lifts the gravity blocks, achieving gravity energy storage. This cycle repeats continuously, enabling the power generation equipment to generate electricity stably, improving the waste heat energy recovery efficiency, reducing heat emissions, and increasing energy utilization. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of an energy storage power generation system for waste heat energy recovery in an embodiment of the present invention;

[0032] Figure 2 yes Figure 1 Sectional view at point AA;

[0033] Figure 3 yes Figure 1 Sectional view at point BB;

[0034] Figure 4 This is a schematic diagram of the initial state of an energy storage power generation system for waste heat energy recovery in an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the state of an energy storage power generation system for waste heat recovery in an embodiment of the present invention during the heating process;

[0036] Figure 6 This is a schematic diagram of the state of an energy storage power generation system for waste heat recovery during the cooling process in an embodiment of the present invention.

[0037] Reference numerals: 1. Gas-powered well; 2. Piston assembly; 3. Power generation equipment; 4. Heating pipeline; 5. Gravity block; 6. Solution pool; 7. Sliding channel; 8. Truss beam; 9. Pulley assembly; 10. Connecting rope; 11. Counterweight block; 12. Gearbox; 13. Drive shaft; 21. Piston block; 22. Connecting frame; 23. Supporting roller; 24. First sealing ring; 25. Second sealing ring; 26. Watertight cavity; 27. Water tank. Detailed Implementation

[0038] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0039] like Figure 1 As shown in Figure 7, this embodiment of the invention proposes an energy storage power generation system for waste heat energy recovery, aiming to improve the recovery efficiency of waste heat energy, reduce heat emissions, and improve energy utilization.

[0040] This invention proposes an energy storage and power generation system for waste heat energy recovery, utilizing the characteristics of gases such as ammonia and hydrogen chloride being highly soluble in water, with large solubility that is greatly affected by temperature. Waste heat from thermal power plants and boiler chimneys is used to heat the liquid medium in a solution tank via heating pipelines. This, combined with the work done by gravity blocks, drives the power generation equipment to generate electricity. When heating stops, the gas dissolves back into the liquid, and the pressure change lifts the gravity blocks, achieving gravity-based energy storage. This cycle repeats continuously, enabling stable power generation, improving waste heat energy recovery efficiency, reducing heat emissions, and increasing energy utilization.

[0041] Energy storage power generation system for waste heat recovery

[0042] like Figure 1 Combination Figure 2 The energy storage and power generation system for waste heat recovery includes a gas-powered well 1, a piston assembly 2, a power generation device 3, a heating pipeline 4, and a gravity block 5.

[0043] like Figure 2As shown, the bottom of the gas-powered well 1 is provided with a solution pool 6 for containing liquid media. The well shaft above the solution pool 6 serves as a sliding channel 7 for the reciprocating sliding of the piston assembly 2. The top of the gas-powered well 1 is provided with a truss beam 8 for supporting the piston assembly 2. A pulley assembly 9 is provided on the truss beam 8.

[0044] Piston assembly 2 is located within sliding channel 7. Piston assembly 2 is connected to truss beam 8 via connecting rope 10. One end of connecting rope 10 is connected to piston assembly 2. The other end of connecting rope 10 is connected to gravity block 5 via pulley assembly 9. A sealing structure is provided between piston assembly 2 and sliding channel 7.

[0045] The gravity block 5 is used to reciprocate linearly along the axis of the gas power well 1 as the piston assembly 2 moves. The gravity block 5 drives the power pulley in the pulley assembly 9 to rotate through the connecting rope 10.

[0046] like Figure 3 As shown, the power generation device 3 is installed on one side of the gas power well 1. The input shaft of the power generation device 3 is connected to the power pulley through a transmission structure.

[0047] Heating pipe 4 is installed inside solution tank 6. Heating pipe 4 is used to heat the liquid medium in solution tank 6, reducing the solubility of the liquid medium in the gas. Heating pipe 4 has an inlet for connecting to a waste heat transfer pipe.

[0048] like Figure 3 As shown, the piston assembly 2 includes a piston block 21, a connecting frame 22, and a support roller 23. The support roller 23 is mounted on the side wall of the piston block 21. The piston block 21 is connected to the inner wall of the sliding channel 7 via the support roller 23. The connecting frame 22 is fixed to the top of the piston block 21. The connecting rope 10 is connected to the connecting frame 22. With this configuration, the support roller 23 provides support to the piston block 21 within the sliding channel 7 and reduces the friction between the piston block 21 and the sliding channel 7 during sliding.

[0049] The sealing structure includes a first sealing ring 24 and a second sealing ring 25. Both the first sealing ring 24 and the second sealing ring 25 are fitted onto the side wall of the piston block 21. A watertight cavity 26 for accommodating water is formed between the first sealing ring 24 and the second sealing ring 25. This arrangement allows the watertight cavity 26 to be filled with water between the two sealing rings, forming a water ring. During the sliding process of the piston assembly 2, the water ring completely isolates the gas inside the well from the atmosphere outside the well, preventing gas leakage. Simultaneously, during piston movement, the water ring also acts as a lubricant, further reducing the friction between the piston assembly 2 and the sliding channel 7.

[0050] To further extend the service life of the water ring, a water tank 27 is provided on the piston block 21 to hold water. A connecting hole is provided on the inner wall of the watertight cavity 26. The bottom of the water tank 27 is connected to the watertight cavity 26 through the connecting hole. In this way, the water tank 27 is used to store water, ensuring that the watertight cavity 26 is always full of water.

[0051] like Figure 2 As shown, a counterweight 11 is provided on the outer side of the gas power well 1 to balance the weight of the piston assembly 2. The counterweight 11 is connected to the piston assembly 2 via a rope and pulley assembly 9. The weight of the counterweight 11 is equal to the weight of the piston assembly 2.

[0052] The gravity block 5 includes a steel plate shell, and a concrete filling structure is poured inside the steel plate shell.

[0053] like Figure 3 As shown, the transmission structure includes a gearbox 12 and a drive shaft 13. The output shaft of the generator 3 is connected to the drive shaft 13 via the gearbox 12, and the drive shaft 13 is connected to a power pulley. For example, the generator 3 may be a generator.

[0054] The heating pipes 4 are arranged in a U-shape at the bottom of the solution tank 6. This arrangement helps to increase the contact area between the heating pipes 4 and the solution medium, thereby further improving the heating efficiency.

[0055] This invention proposes an energy storage and power generation system for waste heat recovery, utilizing the characteristics of gases such as ammonia and hydrogen chloride being highly soluble in water, with large solubility and the solubility being greatly affected by temperature. Waste heat from thermal power plants and boiler chimneys is used to heat the liquid medium in a solution tank via heating pipelines, and the gravity of the gravity blocks drives the power generation equipment to generate electricity.

[0056] The gas-powered well in the energy storage and power generation system for waste heat recovery proposed in this embodiment of the invention can be underground, above ground, or a combination of underground and above ground.

[0057] Power generation method for energy storage power generation system for waste heat energy recovery]

[0058] When using the energy storage and power generation system for waste heat recovery proposed in this embodiment of the invention, the following steps are included:

[0059] like Figure 4 As shown, saturated ammonia water is injected into the solution pool 6 at the bottom of the gas power well 1, the piston assembly 2 is placed at the lowest point of the sliding channel 7, and the gravity block 5 is placed at the top of the gas power well 1.

[0060] like Figure 5As shown, the waste heat from the thermal power plant and the waste heat from the boiler chimney are used to heat the saturated ammonia water through the heating pipeline 4. As the temperature of the ammonia water increases, the solubility of ammonia decreases, and ammonia overflows from the ammonia water into the gas power well 1, pushing the piston assembly 2 upward and the gravity block 5 downward. Through the connecting rope 10, the power pulley is rotated, thereby driving the power generation equipment 3 to generate electricity.

[0061] like Figure 6 As shown, when the temperature rises to the designed maximum temperature, the piston assembly 2 moves to the highest position. At this time, the system begins to cool down. As the system temperature decreases, the ammonia in the gas power well 1 begins to dissolve in the water. During the process of the gas dissolving in the water, the gas pressure in the gas power well 1 continuously decreases. Under the external atmospheric pressure of the piston assembly 2, the piston assembly 2 begins to move downward. During the downward movement, it lifts the gravity block 5 located at the lower position to the higher position, thus completing gravity energy storage.

[0062] This energy storage and power generation system for waste heat recovery uses temperature changes to alter the solubility of gases in water. The gas dissolves in the water to create negative pressure, thereby generating power for lifting heavy objects for energy storage or directly generating or outputting power. It is a system and method for cyclic operation.

[0063] Example 1

[0064] The energy storage and power generation system for waste heat recovery proposed in Example 1 is used as an example for the temperature in spring and autumn. The lower limit of the system temperature is 20°C and the upper limit of the system temperature is 60°C.

[0065] At 1 standard atmosphere and 20°C, 1 volume of water can dissolve approximately 700 volumes of ammonia gas. The solubility of ammonia in water is also greatly affected by temperature; at 1 standard atmosphere and 60°C, 1 volume of water can dissolve approximately 350 volumes of ammonia gas.

[0066] The ammonia-powered well has an inner diameter of 10m and a bottom ammonia solution depth of 0.15m. When the well is under vacuum, the external atmospheric pressure acting on the piston is 809t. Considering operational efficiency and the fact that the well cannot achieve a complete vacuum during operation, the vacuum level is assumed to be 70%. Therefore, the pressure difference between the inside and outside of the piston is 809 × 70% = 566t. This is used as the standard value for lifting the gravity block, i.e., the gravity block weighs 566t. The piston is equipped with a counterweight of the same weight as the piston; during operation, the piston's weight can be disregarded.

[0067] The gravity block is made of reinforced concrete and measures 5.5m x 5.5m x 7.5m. The gravity block weighs 566t.

[0068] System initial state:

[0069] The ambient temperature is 20℃, the pressure is 1 standard atmosphere, and the ammonia water at the bottom of the well is saturated, meaning that 700 times the volume of water has dissolved ammonia gas in the water. The piston is positioned above the water surface, and the gravity block is at a height of 50m.

[0070] first step:

[0071] When ammonia water at the bottom of a well is heated from 20°C to 60°C, the solubility of ammonia decreases as the water temperature increases, causing the ammonia gas to gradually escape from the water. When the water temperature reaches 60°C, based on the solubility of ammonia, 1 volume of water can dissolve 350 volumes of ammonia gas. If the water depth is 0.15m, then the height of the ammonia gas escaping from the water is 0.15 × 350 = 50m.

[0072] During this process, the piston moves upward, the gravity block moves downward, and the gravity block drives the generator to generate electricity. When the piston moves upward 50m, the gravity block also falls to the ground.

[0073] Step Two:

[0074] The water and ammonia gas in the well were cooled to 20°C.

[0075] During the system cooling process, as the temperature decreases, the solubility of ammonia gradually increases. As the ammonia in the well dissolves in the water, a negative pressure is generated inside the well. Under the action of the pressure difference between the inside and outside, the piston moves down and lifts the gravity block.

[0076] When the system temperature drops to 20°C, the piston returns to its initial position, and the gravity block is lifted to a height of 50m.

[0077] Step 3:

[0078] Proceed to the next loop.

[0079] The mass of the gravity block lifted in a single lift of the power well is 566t, the lifting height is 50m, the gravitational potential energy stored in a single lift is 277,332,650 joules, and the generator efficiency is 95%. Therefore, the gravitational potential energy stored in a single lift can be converted into 73 kWh of electricity.

[0080] The system uses a small amount of water, heats up quickly, and allows for control of the heating system's temperature and flow rate, thus controlling the heating rate.

[0081] The system cools down slowly by itself, so a heat exchange system can be installed inside the well to accelerate the cooling process.

[0082] The initial calculation is that one cycle of a power well takes 30 minutes, and the power well cycles 24 times a day. Therefore, the daily power generation of a single power well is 1752 kWh, and the annual power generation is 640,000 kWh.

[0083] Example 2

[0084] Example 2 presents an energy storage and power generation system for waste heat recovery, taking the temperature suitable for northern winters as an example. The lower limit of the system temperature is 0°C, and the upper limit of the system temperature is 60°C.

[0085] At 1 standard atmosphere and 0°C, 1 volume of water can dissolve approximately 900 volumes of ammonia gas. The solubility of ammonia in water is also greatly affected by temperature; at 1 standard atmosphere and 60°C, 1 volume of water can dissolve approximately 350 volumes of ammonia gas.

[0086] The ammonia-powered well has an inner diameter of 10m and a bottom ammonia solution depth of 0.15m. When the well is under vacuum, the external atmospheric pressure acting on the piston is 809t. Considering operational efficiency and the fact that the well cannot achieve a complete vacuum during operation, the vacuum level is assumed to be 70%. Therefore, the pressure difference between the inside and outside of the piston is 809 × 70% = 566t. This is used as the standard value for lifting the gravity block, i.e., the gravity block weighs 566t. The piston is equipped with a counterweight of its own weight, which has the same weight as the piston and can be disregarded during operation.

[0087] The gravity block is made of reinforced concrete and measures 5.5m x 5.5m x 7.5m. The gravity block weighs 566t.

[0088] System initial state:

[0089] The ambient temperature is 0℃, the pressure is 1 standard atmosphere, and the ammonia water at the bottom of the well is saturated, meaning that 900 times the volume of water has dissolved ammonia gas. The piston is positioned above the water surface, and the gravity block is at a height of 83m.

[0090] first step:

[0091] When ammonia water at the bottom of a well is heated from 0°C to 60°C, the solubility of ammonia decreases as the water temperature increases, causing the ammonia gas to gradually escape from the water. When the water temperature reaches 60°C, based on the solubility of ammonia, 1 volume of water can dissolve 350 volumes of ammonia gas. If the water depth is 0.15m, then the height of the ammonia gas escaping from the water is 0.15 × 550 = 83m.

[0092] During this process, the piston moves upward, the gravity block moves downward, and the gravity block drives the generator to generate electricity. When the piston moves upward 83m, the gravity block also falls to the ground.

[0093] Step Two:

[0094] The water and ammonia gas in the well were cooled to 0°C.

[0095] During the system cooling process, as the temperature decreases, the solubility of ammonia gradually increases. As the ammonia in the well dissolves in the water, a negative pressure is generated inside the well. Under the action of the pressure difference between the inside and outside, the piston moves down and lifts the gravity block.

[0096] When the system temperature drops to 0℃, the piston returns to its initial position, and the gravity block is lifted to a height of 83m.

[0097] Step 3:

[0098] Proceed to the next loop.

[0099] The mass of the gravity block lifted in a single lift of the power well is 566t, the lifting height is 83m, the gravitational potential energy stored in a single lift is 277,332,650 joules, and the generator efficiency is 95%. Therefore, the gravitational potential energy stored in a single lift can be converted into 121 kilowatt-hours of electricity.

[0100] The system uses a small amount of water, heats up quickly, and allows for control of the heating system's temperature and flow rate, thus controlling the heating rate.

[0101] In northern regions, winter temperatures are low, typically around -10℃, resulting in a faster natural cooling rate for the system. A heat exchange system can be installed inside the well to further accelerate the cooling process.

[0102] Because the system cools down quickly in winter, the initial cycle time of one power well is set at 15 minutes. The number of cycles per day for a power well is 48. Therefore, the daily power generation of a single power well is 5808 kWh, and the annual power generation is 2.12 million kWh.

[0103] This invention is not limited to the specific technical solutions described in the above embodiments. Besides the above embodiments, this invention may have other implementation methods. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. An energy storage and power generation system for waste heat energy recovery, characterized in that, This includes gas-powered wells, piston assemblies, power generation equipment, heating pipelines, and gravity blocks; The bottom of the gas-powered well is provided with a solution pool for containing liquid medium, and a sliding channel for reciprocating sliding of the piston assembly is provided above the solution pool. The top of the gas-powered well is provided with a truss beam for supporting the piston assembly, and a pulley assembly is provided on the truss beam. The piston assembly is located in the sliding channel. The piston assembly is connected to the truss beam by a connecting rope. One end of the connecting rope is connected to the piston assembly, and the other end of the connecting rope is connected to the gravity block through the guide of the pulley assembly. A sealing structure is provided between the piston assembly and the sliding channel. The gravity block is used to reciprocate linearly along the axis of the gas power well as the piston assembly moves. The gravity block drives the power pulley in the pulley assembly to rotate through the connecting rope. The power generation equipment is installed on one side of the gas power well, and the input shaft of the power generation equipment is connected to the power pulley through a transmission structure; The heating pipeline is laid in the solution tank and is used to heat the liquid medium in the solution tank to change the solubility of the liquid medium in the gas. The heating pipeline has an inlet for connecting to the waste heat conveying pipeline.

2. The energy storage and power generation system for waste heat recovery according to claim 1, characterized in that, The piston assembly includes a piston block, a connecting frame, and a support roller. The support roller is mounted on the side wall of the piston block, and the piston block is connected to the inner wall of the sliding channel via the support roller. The connecting frame is fixed to the top of the piston block, and the connecting rope is connected to the connecting frame.

3. The energy storage and power generation system for waste heat recovery according to claim 2, characterized in that, The sealing structure includes a first sealing ring and a second sealing ring, both of which are sleeved on the side wall of the piston block, and a watertight cavity for accommodating water is formed between the first sealing ring and the second sealing ring.

4. The energy storage and power generation system for waste heat recovery according to claim 3, characterized in that, The piston block is equipped with a water tank to hold water, and the inner wall of the watertight cavity is provided with a connecting hole. The bottom of the water tank is connected to the watertight cavity through the connecting hole.

5. The energy storage and power generation system for waste heat recovery according to claim 1, characterized in that, A counterweight is provided on the outside of the gas-powered well to balance the weight of the piston assembly. The counterweight is connected to the piston assembly via a rope and a pulley assembly, and the weight of the counterweight is equal to the weight of the piston assembly.

6. The energy storage and power generation system for waste heat recovery according to claim 1, characterized in that, The heating pipelines are arranged in a U-shape at the bottom of the solution pool.

7. The energy storage and power generation system for waste heat recovery according to claim 1, characterized in that, The transmission structure includes a gearbox and a drive shaft. The output shaft of the power generation equipment is connected to the drive shaft through the gearbox, and the drive shaft is connected to a power pulley.

8. The energy storage and power generation system for waste heat recovery according to claim 1, characterized in that, The gravity block includes a steel plate shell, and a concrete filling structure is poured inside the steel plate shell.

9. The energy storage and power generation system for waste heat recovery according to claim 1, characterized in that, The liquid medium is a saturated ammonia solution.

10. The power generation method of the energy storage power generation system for waste heat energy recovery according to any one of claims 1-9, characterized in that, include: Saturated ammonia water is injected into the solution pool at the bottom of the gas-powered well, the piston assembly is placed at the lowest point of the sliding channel, and the gravity block is placed at the top of the gas-powered well. Waste heat from thermal power plants and boiler chimneys is used to heat saturated ammonia water through heating pipelines. As the temperature of the ammonia water rises, the solubility of ammonia decreases, and ammonia gas overflows from the ammonia water into the gas power well. This pushes the piston assembly upward, the gravity block downward, and drives the power pulley to rotate through the connecting rope, thereby driving the power generation equipment to generate electricity. When the temperature rises to the designed maximum temperature, the piston assembly moves to the highest position, at which point the system begins to cool down. As the system temperature decreases, the ammonia in the gas power well begins to dissolve in the water. During the process of the gas dissolving in the water, the gas pressure in the gas power well continuously decreases. Under the external atmospheric pressure of the piston assembly, the piston assembly begins to move downwards, and during the downward movement, it lifts the gravity block located at the lower position to the higher position, completing gravity energy storage.

Images