WO2023126018A1

WO2023126018A1 - Energy storage and power generation system for waste heat energy recovery, and power generation method

Info

Publication number: WO2023126018A1
Application number: PCT/CN2023/076776
Authority: WO
Inventors: 张鲁国; 张宸溪; 张宸羽
Original assignee: 张鲁国; 张宸溪; 张宸羽
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-07-06
Also published as: CN116670392A

Abstract

An energy storage and power generation system for waste heat energy recovery, and a power generation method. The power generation system comprises a gas power well (1), a piston assembly (2), a power generation device (3), a heat supply pipe (4), and a gravity block (5). A solution pool (6) used for containing aqueous ammonia is provided at the bottom of the gas power well, and a slide channel (7) used for the piston assembly to slide reciprocatingly is arranged above the solution pool. The gravity block is used to drive the power generation device to implement power generation. Aqueous ammonia in the solution pool is heated by means of the heat supply pipe to generate ammonia gas, the ammonia gas pushes the piston assembly to move upwards, and the gravity block moves downwards. After heating is stopped, the ammonia gas dissolves in water, the piston moves downwards to drive a generator to generate power and move the gravity block upwards, thus allowing for gravity energy storage.

Description

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

technical field

The invention relates to the technical field of energy storage and power generation, in particular to an energy storage and power generation system and a power generation method for recovering waste heat energy.

Background technique

At present, the low-temperature steam generated by most thermal power plants needs to be cooled by water cooling or air cooling, and then returned to the boiler for cyclic heating to generate electricity. This part of the heat that needs to be cooled is called waste heat. In spring, summer, and autumn, thermal power plants need to deal with waste heat through water cooling or air cooling. In winter in the north, except for the thermal power plants that are closer to the city can use part of the waste heat to co-generate heat and power with the city to heat the city, the thermal power plant that is farther from the city still needs to use water cooling or air cooling to cool the waste heat.

In addition, in industrial parks, many enterprises need to burn boilers to meet their own production heat requirements. The temperature of the smoke discharged from the boiler chimney is very high, and the heat energy contained in this part of the discharged smoke can only be discharged into the atmosphere along with the smoke. And dissipate; in northern cities, need to burn boilers for central heating in winter, and the heat of boiler flue gas also dissipates in the atmosphere.

The above-mentioned heat dissipated in the atmosphere is very large, and cannot be effectively collected and utilized due to the low recycling rate.

At present, in the prior art, aiming at the waste heat energy generated in the above scenarios, a heat exchange device is usually used at the end of the exhaust system to recover sensible heat or recover full heat from the residual heat energy. For example, a waste heat recovery device, system and method disclosed in Chinese patent document CN1981122A. In this waste heat recovery device, a heat exchanger filled with a catalyst for reforming DME is provided on an exhaust system of a combustion device such as a furnace, an internal combustion engine, or a power generation facility. By passing the mixed gas of DME and water through the heat exchanger, the DME is thermally decomposed, and the sensible heat of the boiler or internal combustion engine exhaust is recovered as hydrogen fuel.

However, in the actual use of the above-mentioned waste heat recovery device, there are limitations in the use of recovered energy, and the conversion of energy lacks universal applicability.

As another example, Chinese patent document CN113944521A discloses a low-temperature waste heat magnetic levitation turbine power generation system. The power generation system is mainly composed of a magnetic levitation turbine generator (unit), a cooling tower, a working medium pump, and a heat exchanger. The cooling tower cools the gasified working fluid into a liquid state. The working fluid pump pressurizes the liquid working fluid and pumps it into the heat exchanger. After the heat exchanger vaporizes the working fluid, the volume expands rapidly, which drives the magnetic levitation turbine generator to rotate at high speed and output electric energy. The power generation system maximizes the energy in the heat source, achieving the goals of zero fuel, reducing heat emissions, efficient recovery of waste heat, and clean output of electricity.

Although the above-mentioned low-temperature waste heat magnetic levitation turbine power generation system can convert the energy in the heat source into electric energy for use, however, for the use scenario of waste heat recovery, its recycling rate is difficult to meet the demand.

technical problem

In summary, in the process of waste heat energy recovery, how to design an energy storage power generation device to improve the recovery efficiency of waste heat energy, reduce heat emissions, and improve energy utilization has become an urgent technology for those skilled in the art. question.

The object of the present invention is to provide an energy storage power generation device for the recovery process of waste heat energy, which is used to improve the recovery efficiency of waste heat energy, reduce heat emission, and improve energy utilization rate.

solution

In order to achieve the above object, the present invention adopts the following scheme: an energy storage power generation system for waste heat energy recovery is proposed, including a gas power well, a piston assembly, power generation equipment, a heating pipeline and a gravity block;

The bottom of the gas power well is provided with a solution pool for containing the liquid medium, the top of the solution pool is provided with a sliding channel for the reciprocating sliding of the piston assembly, and the top of the gas power well is provided with a truss beam for supporting the piston assembly , a pulley assembly is arranged on the truss beam;

The piston assembly is located in the sliding channel, and the piston assembly is connected to the truss beam through 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 for reciprocating linear motion along the axial direction of the gas power well with the movement of the piston assembly, and 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 with the power pulley through a transmission structure;

The heat supply pipeline is arranged in the solution pool, and the heat supply pipeline is used to heat the liquid medium in the solution pool to reduce the solubility of the liquid medium to the gas. The heat supply pipeline has a input port.

Preferably, the piston assembly includes a piston block, a connecting frame and a supporting roller, the supporting roller is installed on the side wall of the piston block, the piston block is connected with the inner wall of the sliding channel through the supporting roller, and the connecting frame is fixed on the top of the piston block, The connecting rope is connected with the connecting frame. In this arrangement, the supporting rollers are used to provide support to the piston block in the sliding channel, and reduce the frictional force between the piston block and the sliding channel during the sliding process.

Preferably, the sealing structure includes a first sealing ring and a second sealing ring, both of the first sealing ring and the second sealing ring are sleeved on the side wall of the piston block, and a water body is formed between the first sealing ring and the second sealing ring watertight cavity. In this way, the watertight cavity is convenient to be filled with water between the two sealing rings to form a water ring. During the sliding process of the piston assembly, the water ring completely isolates the gas inside the wellbore from the atmosphere outside the wellbore and prevents the gas from leaking out. , At the same time, during the movement of the piston, the water ring can also play a lubricating role, further reducing the friction between the piston assembly and the sliding channel.

Preferably, a water tank for accommodating water is provided on the piston block, a communication hole is provided on the inner wall of the watertight cavity, and the bottom of the water tank is connected with the watertight cavity through the communication hole. With such arrangement, the water tank is used to store the water body, so as to ensure that the watertight cavity is always filled with the water body.

Preferably, the outside of the gas power well is provided with a counterweight for balancing the weight of the piston assembly. The counterweight is connected to the piston assembly through a cable through the pulley assembly, and the weight of the counterweight is equal to the weight of the piston assembly.

Preferably, the heating pipeline is arranged in a loop at the bottom of the solution pool. Such setting is beneficial to increase the contact area between the heating pipeline and the solution medium, thereby further improving the heating efficiency.

Preferably, the transmission structure includes a gearbox and a transmission shaft, the output shaft of the power generation equipment is connected to the transmission shaft through the gearbox, and the transmission shaft is connected to the power pulley.

Preferably, the gravity block includes a steel plate shell, and a concrete filling structure is poured into the steel plate shell.

Preferably, the liquid medium is a saturated ammonia solution.

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

Inject saturated ammonia water into the solution pool at the bottom of the gas power well, place the piston assembly at the lowest point of the slide channel, and place the gravity block on the top of the gas power well;

Thermal power plant waste heat and boiler chimney waste heat pass through the heating pipeline to heat saturated ammonia water. As the temperature of ammonia water rises, the solubility of ammonia gas decreases, ammonia gas overflows from the ammonia water into the gas power well, and pushes the piston assembly up. Gravity The block moves down and drives the power pulley to rotate through the connecting rope, and then drives the power generation equipment to generate power;

When the temperature rises to the highest design temperature, the piston assembly moves up to the highest position, and the system starts to cool down. As the system temperature drops, the ammonia gas in the gas power well begins to dissolve in water. During the process of gas dissolving in water , the air pressure in the gas power well keeps decreasing, and the piston assembly starts to move downward due to the external atmospheric pressure of the piston assembly, and during the downward movement, the gravity block located at the low place is lifted to the high place to complete the gravity energy storage.

The principle of the invention: the solubility of gas in water is changed by changing the temperature. When the gas dissolves in water, a negative pressure is formed in the wellbore, and when the gas is separated from the water, a positive pressure is formed in the wellbore, which drives the piston assembly to reciprocate, and lifts the heavy object to store energy or Direct power generation or power output.

Beneficial effect

Compared with the prior art, the present invention has the following prominent substantive features and significant progress: the energy storage power generation system for waste heat energy recovery utilizes ammonia, hydrogen chloride and other gases that are easily soluble in water, with a large amount of dissolution, The amount of dissolution is greatly affected by temperature. The liquid medium in the solution pool is heated by the waste heat of the thermal power plant and the waste heat of the boiler chimney through the heating pipeline, combined with the gravitational work of the gravity block to drive the power generation equipment to generate electricity. When the heating is stopped, the gas It is dissolved in the liquid again, and the gravity block is lifted by the change of air pressure to realize the gravity energy storage. This cycle makes the power generation equipment generate electricity stably, improves the recovery efficiency of waste heat energy, reduces heat emission, and improves the energy utilization.

Description of drawings

Fig. 1 is a schematic structural diagram of an energy storage power generation system for waste heat energy recovery in an embodiment of the present invention;

Fig. 2 is the sectional view of A-A place among Fig. 1;

Fig. 3 is the sectional view of B-B place among Fig. 1;

Fig. 4 is a schematic diagram of an initial state of an energy storage power generation system for waste heat energy recovery in an embodiment of the present invention;

Fig. 5 is a schematic diagram of a heating process of an energy storage power generation system for waste heat energy recovery in an embodiment of the present invention;

Fig. 6 is a schematic diagram of a state of an energy storage power generation system for waste heat energy recovery in a cooling process in an embodiment of the present invention.

Reference signs: 1, gas power 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 block 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.

Embodiments of the present invention

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1-7, an energy storage power generation system for waste heat energy recovery is proposed in an embodiment of the present invention, aiming at improving the recovery efficiency of waste heat energy, reducing heat emission, and improving energy utilization.

An energy storage power generation system for waste heat energy recovery proposed in the embodiments of the present invention utilizes the characteristics that ammonia, hydrogen chloride and other gases are easily soluble in water, have a large amount of dissolution, and are greatly affected by temperature. The waste heat of the thermal power plant and the waste heat of the boiler chimney are used to heat the liquid medium in the solution pool through the heating pipeline, and combined with the gravitational work of the gravity block to drive the power generation equipment to generate electricity. When the heating is stopped, the gas dissolves in the liquid again, and the gravity block is lifted by the change of air pressure, realizing the gravity energy storage. Such a cycle makes the power generation equipment generate electricity stably, improves the recovery efficiency of waste heat energy, reduces heat emission, and improves the energy utilization rate.

As shown in FIG. 1 in conjunction with FIG. 2 , an energy storage power generation system for waste heat energy recovery includes a gas power well 1 , a piston assembly 2 , a power generation device 3 , a heat supply pipeline 4 and a gravity block 5 .

As shown in FIG. 2 , a solution pool 6 for accommodating a liquid medium is provided at the bottom of the gas power well 1 . The wellbore above the solution pool 6 serves as a sliding passage 7 for the piston assembly 2 to slide back and forth. The top of the gas power well 1 is provided with a truss beam 8 for supporting the piston assembly 2 . A pulley assembly 9 is arranged on the truss beam 8 .

The piston assembly 2 is located in the slide channel 7 . The piston assembly 2 is connected to the truss girder 8 through a connecting rope 10 . One end of the connecting rope 10 is connected with the piston assembly 2 . The other end of the connecting rope 10 links to each other with the gravity block 5 through the guide of the pulley assembly 9 . A sealing structure is provided between the piston assembly 2 and the sliding channel 7 .

The gravity block 5 is used for reciprocating linear motion along the axial direction of the gas power well 1 along with the movement of the piston assembly 2 , and the gravity block 5 drives the power pulley in the pulley assembly 9 to rotate through the connecting rope 10 .

As shown in FIG. 3 , the power generation equipment 3 is installed on one side of the gas power well 1 . The input shaft of the power generating equipment 3 is connected with the power pulley through the transmission structure.

The heating pipeline 4 is arranged in the solution pool 6 . The heat supply pipeline 4 is used to heat the liquid medium in the solution pool 6 to reduce the solubility of the liquid medium to gas. The heat supply line 4 has an inlet for connection to a waste heat delivery line.

As shown in FIG. 3 , the piston assembly 2 includes a piston block 21 , a connecting frame 22 and a supporting roller 23 . Support rollers 23 are mounted on the side walls of the piston block 21 . The piston block 21 is connected to the inner wall of the sliding channel 7 through the support roller 23 . The connecting frame 22 is fixed on the top of the piston block 21 . The connecting rope 10 is connected to the connecting frame 22 . In this way, the supporting rollers 23 are used to provide support to the piston block 21 in the sliding channel 7 and reduce the frictional force between the piston block 21 and the sliding channel 7 during the sliding process.

Wherein, 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 sleeved on the side wall of the piston block 21 . A watertight cavity 26 containing water is formed between the first sealing ring 24 and the second sealing ring 25 . So set, the watertight cavity 26 is convenient to be filled with water between the two sealing rings to form a water ring. During the sliding process of the piston assembly 2, the water ring completely isolates the gas inside the wellbore from the atmosphere outside the wellbore and prevents the gas Leaked. At the same time, during the movement of the piston, the water ring can also play a lubricating role, further reducing the friction between the piston assembly 2 and the sliding channel 7 .

In order to further maintain the service life of the water ring, a water tank 27 for containing water is provided on the piston block 21 . Communication holes are 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 a communication hole. In this way, the water tank 27 is used to store water, so as to ensure that the watertight cavity 26 is always filled with water.

As shown in FIG. 2 , a counterweight 11 for balancing the dead weight of the piston assembly 2 is provided on the outside of the gas power well 1 . The counterweight 11 is connected with the piston assembly 2 through the pulley assembly 9 through a cable. The weight of the counterweight 11 is equal to the weight of the piston assembly 2 .

The gravity block 5 includes a steel plate shell, and a concrete filling structure is poured in the steel plate shell.

As shown in FIG. 3 , the transmission structure includes a gearbox 12 and a transmission shaft 13 . The output shaft of the power generating equipment 3 is connected with the transmission shaft 13 through the gearbox 12, and the transmission shaft 13 is connected with the power pulley. For example, the power generation equipment 3 is a generator.

The heating pipeline 4 is arranged in a loop shape at the bottom of the solution pool 6 . Such setting is beneficial to increase the contact area between the heating pipeline 4 and the solution medium, thereby further improving the heating efficiency.

An energy storage power generation system for waste heat energy recovery proposed in the embodiments of the present invention utilizes the characteristics that ammonia, hydrogen chloride and other gases are easily soluble in water, have a large amount of dissolution, and are greatly affected by temperature. The waste heat of the thermal power plant and the waste heat of the boiler chimney are used to heat the liquid medium in the solution pool through the heating pipeline, and combined with the gravitational work of the gravity block to drive the power generation equipment to generate electricity.

The gas power well in the energy storage power generation system for waste heat energy recovery proposed in the embodiments of the present invention may be underground, aboveground, or a combination of underground and aboveground.

An energy storage power generation system for waste heat energy recovery proposed in an embodiment of the present invention, when used, includes the following steps:

As shown in Figure 4, inject saturated ammonia water into the solution pool 6 at the bottom of the gas power well 1, place the piston assembly 2 at the lowest point of the sliding channel 7, and place the gravity block 5 on the top of the gas power well 1;

As shown in Figure 5, the waste heat from the thermal power plant and the waste heat from the boiler chimney pass through the heating pipeline 4 to heat the saturated ammonia water. As the temperature of the ammonia water increases, the solubility of the ammonia gas decreases, and the ammonia gas overflows from the ammonia water into the gas power well 1 , and push the piston assembly 2 to move up, the gravity block 5 moves down and drives the power pulley to rotate through the connecting rope 10, and then drives the power generating equipment 3 to implement power generation;

As shown in Figure 6, when the temperature rises to the design maximum temperature, the piston assembly 2 moves up to the highest position, and the system starts to cool down at this time. As the system temperature decreases, the ammonia gas in the gas power well 1 begins to dissolve in the water , in the process of gas dissolving in water, the air pressure in the gas power well 1 keeps decreasing, and the piston assembly 2 starts to move downward due to the external atmospheric pressure of the piston assembly 2, and will be at a low position during the downward movement Gravity block 5 is promoted to high place, completes gravitational energy storage.

When the energy storage power generation system for waste heat energy recovery is used, the solubility of gas in water is changed through temperature changes, and the gas is dissolved in water to form a negative pressure, thereby forming power, lifting heavy objects for energy storage or directly generating power or power A system of outputs and a method that can be run cyclically.

Example

An energy storage power generation system for waste heat energy recovery proposed in Example 1 takes the temperature suitable for spring and autumn as an example, the lower limit of the system temperature is 20°C, and the upper limit of the system temperature is 60°C.

At 1 standard atmospheric pressure and 20°C, 1 volume of water can dissolve about 700 volumes of ammonia. The solubility of ammonia in water is also greatly affected by temperature. At 1 standard atmospheric pressure and 60°C, 1 volume of water can dissolve about 350 volumes of ammonia.

The inner diameter of the ammonia gas power well is 10m, and the depth of the ammonia solution at the bottom is 0.15m; when the power well is in a vacuum state, the external atmospheric pressure acting on the piston is 809t. If the vacuum degree is calculated as 70%, the internal and external gas pressure difference acting on the piston is 809×70%=566t, which is used as the standard value for the weight of the gravity block lifted by the power well, that is, the weight of the gravity block is 566t. The piston is equipped with a piston self-weight counterweight, which has the same weight as the piston. During operation, the piston self-weight can be ignored.

The gravity block adopts reinforced concrete block, length×width×height=5.5×5.5×7.5m, and the gravity block weighs 566t.

System initial state:

The ambient temperature is 20°C, 1 standard atmospheric pressure, and the ammonia water at the bottom of the well is in a saturated state, that is, 700 times the volume of the water body has dissolved ammonia gas in the water. The piston is at the top of the water surface and the gravity block is at a height of 50m.

first step:

Heat the ammonia water at the bottom of the well from 20°C to 60°C. As the water temperature rises, the solubility of ammonia gas decreases, and the ammonia gas gradually overflows from the water. When the water temperature reaches 60°C, according to the solubility of ammonia gas, 1 volume of water can Dissolve 350 volumes of ammonia gas. The depth of water is 0.15m, then the height of ammonia gas overflowing from the water is 0.15×350=50m.

During this process, the piston moves up, the gravity block moves down, and the gravity block drives the generator to generate electricity. When the piston moved up 50m, the gravity block also fell to the ground.

Step two:

Cool the water and ammonia in the well to 20°C.

During the cooling process of the system, as the temperature decreases, the solubility of ammonia gas gradually increases. As the ammonia gas in the well dissolves in water, negative pressure is generated in the well. hoist.

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

third step:

Enter the next cycle.

The weight of the gravity block is 566t in a single lifting of the power well, the lifting height is 50m, the gravitational potential energy of the single lifting reserve is 277,332,650 joules, and the generator efficiency is 95%, so the gravity potential energy of the single lifting reserve is converted into electrical energy of 73 kWh.

The water volume of the system is small, and the heating speed is fast, and the temperature and flow of the heating system can be controlled to control the heating speed.

The natural cooling speed of the system is relatively slow, and a heat exchange system can be installed in the well to accelerate the cooling process of the system through the heat exchange system.

It is preliminarily determined that a cycle of the power well is 30 minutes, and the number of cycles of the power well is 24 times a day, so the power generation of a single power well is 1,752 degrees per day, and the annual power generation is 640,000 degrees.

Example

An energy storage power generation system for waste heat energy recovery proposed in Example 2 takes the temperature suitable for northern winter as an example, the lower limit of the system temperature is 0°C, and the upper limit of the system temperature is 60°C.

At 1 standard atmospheric pressure and 0°C, 1 volume of water can dissolve about 900 volumes of ammonia. The solubility of ammonia in water is also greatly affected by temperature. At 1 standard atmospheric pressure and 60°C, 1 volume of water can dissolve about 350 volumes of ammonia.

System initial state:

The ambient temperature is 0°C, the pressure is 1 standard atmosphere, and the ammonia water at the bottom of the well is in a saturated state, that is, 900 times the volume of the water body has dissolved ammonia gas in the water. The piston is at the top of the water surface, and the gravity block is at a height of 83m.

first step:

Heat the ammonia water at the bottom of the well from 0°C to 60°C. As the water temperature rises, the solubility of ammonia gas decreases, and the ammonia gas gradually overflows from the water. When the water temperature reaches 60°C, according to the solubility of ammonia gas, 1 volume of water can Dissolve 350 volumes of ammonia gas. The depth of water is 0.15m, then the height of ammonia gas overflowing from the water is 0.15×550=83m.

During this process, the piston moves up, the gravity block moves down, and the gravity block drives the generator to generate electricity. When the piston moved up 83m, the gravity block also fell to the ground.

Step two:

Cool the water and ammonia in the well to 0°C.

When the system temperature drops to 0°C, the piston returns to the initial position, and the gravity block is hoisted to a height of 83m.

third step:

Enter the next cycle.

The mass of the gravity block is 566t in a single lifting of the power well, the lifting height is 83m, the gravitational potential energy of the single lifting reserve is 277,332,650 joules, and the generator efficiency is 95%, so the gravity potential energy of the single lifting reserve is converted into electrical energy of 121 kWh.

The temperature in winter in the north is low, usually around -10°C, and the natural cooling speed of the system is fast. A heat exchange system can be installed in the well, and the cooling process of the system can be further accelerated through the heat exchange system.

Due to the fast cooling speed of the system in winter, the initial cycle of the power well is 15 minutes, and the number of cycles of the power well is 48 times a day. The power generation of a single power well is 5808 degrees per day, and the annual power generation is 2.12 million Spend.

The present invention is not limited to the specific technical solutions described in the above embodiments. Besides the above embodiments, the present invention can also have other implementation modes. For those skilled in the art, within the spirit and principles of the present invention, any technical solutions formed by any modifications, equivalent replacements, improvements, etc. shall be included in the protection scope of the present invention.

Claims

An energy storage power generation system for waste heat energy recovery, characterized in that it includes a gas power well, a piston assembly, power generation equipment, heating pipelines and gravity blocks;

The bottom of the gas power well is provided with a solution pool for containing the liquid medium, the top of the solution pool is provided with a sliding channel for the reciprocating sliding of the piston assembly, and the top of the gas power well is provided with a truss beam for supporting the piston assembly , a pulley assembly is arranged on the truss beam;

The piston assembly is located in the sliding channel, and the piston assembly is connected to the truss beam through 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 for reciprocating linear motion along the axial direction of the gas power well with the movement of the piston assembly, and 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 with the power pulley through a transmission structure;

The heat supply pipeline is arranged in the solution pool, and the heat supply pipeline is used to heat the liquid medium in the solution pool to change the solubility of the liquid medium to the gas. The heat supply pipeline has a input port.
The energy storage power generation system for waste heat energy recovery according to claim 1, wherein the piston assembly comprises a piston block, a connecting frame and a supporting roller, and the supporting roller is installed on the side wall of the piston block , the piston block is connected with the inner wall of the sliding channel through the support roller, the connecting frame is fixed on the top of the piston block, and the connecting rope is connected with the connecting frame.
The energy storage power generation system for waste heat energy recovery according to claim 2, wherein the sealing structure includes a first sealing ring and a second sealing ring, and the first sealing ring and the second sealing ring are both sleeved It is provided on the side wall of the piston block, and a watertight cavity containing water body is formed between the first sealing ring and the second sealing ring.
The energy storage power generation system for waste heat energy recovery according to claim 3, wherein a water tank for accommodating water is arranged on the piston block, a communicating hole is arranged on the inner wall of the watertight cavity, and the water tank The bottom of the tank is connected to the watertight cavity through a communication hole.
The energy storage power generation system for waste heat energy recovery according to claim 1, characterized in that, a counterweight for balancing the dead weight of the piston assembly is arranged on the outside of the gas power well, and the counterweight passes through the cable through The pulley assembly is connected with the piston assembly, and the weight of the counterweight is equal to that of the piston assembly.
The energy storage power generation system for waste heat energy recovery according to claim 1, wherein the heating pipeline is arranged in a loop at the bottom of the solution pool.
The energy storage power generation system for waste heat energy recovery according to claim 1, wherein the transmission structure includes a gearbox and a transmission shaft, the output shaft of the power generation equipment is connected to the transmission shaft through the gearbox, and the The transmission shaft is connected with the power pulley.
The energy storage power generation system for waste heat energy recovery according to claim 1, wherein the gravity block comprises a steel plate shell, and a concrete filling structure is poured inside the steel plate shell.
The energy storage power generation system for waste heat energy recovery according to claim 1, wherein the liquid medium is a saturated ammonia solution.
The power generation method of an energy storage power generation system for waste heat energy recovery according to any one of claims 1-9, characterized in that it includes:

Inject saturated ammonia water into the solution pool at the bottom of the gas power well, place the piston assembly at the lowest point of the slide channel, and place the gravity block on the top of the gas power well;

Thermal power plant waste heat and boiler chimney waste heat pass through the heating pipeline to heat saturated ammonia water. As the temperature of ammonia water rises, the solubility of ammonia gas decreases, ammonia gas overflows from the ammonia water into the gas power well, and pushes the piston assembly up. Gravity The block moves down and drives the power pulley to rotate through the connecting rope, and then drives the power generation equipment to generate electricity;

When the temperature rises to the highest design temperature, the piston assembly moves up to the highest position, and the system starts to cool down. As the system temperature drops, the ammonia gas in the gas power well begins to dissolve in water. During the process of gas dissolving in water , the air pressure in the gas power well keeps decreasing, and the piston assembly starts to move downward due to the external atmospheric pressure of the piston assembly, and during the downward movement, the gravity block located at the low place is lifted to the high place to complete the gravity energy storage. .