Gas pressure reduction power generation energy saving device

Abstract

The present invention is an energy-saving device for gas pressure reduction and power generation. It solves the problem that in a natural gas transmission pipeline, when a pressure reducing valve is used to reduce the pressure of natural gas, the energy of the natural gas pressure drop is wasted, and because the natural gas temperature decreases during the pressure reduction process, it may freeze and affect the use, and it is often necessary to heat the natural gas in a water bath in advance to consume energy. The present invention is used in a natural gas pressure reducing station and is used in parallel with a pressure reducing valve. The pressure energy of the natural gas is used to generate electricity and is converted into electrical energy for use, and the energy consumed by heating the natural gas in a water bath is saved, thereby achieving the purpose of energy saving.

Description

Technical Field

[0001] The present invention relates to a natural gas pressure reducing device, and in particular to a natural gas pressure reducing and energy saving device. Background Art

[0002] In a large number of natural gas transmission pipelines, pressure reducing valves are used to reduce the pressure of natural gas, but the energy of the natural gas pressure drop is wasted. In addition, since the temperature of the natural gas drops during the pressure reduction process, it may freeze and affect its use. It is often necessary to heat the natural gas in a water bath in advance to consume energy. Summary of the invention

[0003] The object of the present invention is to provide a gas pressure reduction power generation energy-saving device which utilizes the pressure energy of natural gas in a natural gas pressure reduction station to generate electricity and convert it into electrical energy.

[0004] The present invention is implemented as follows: A gas pressure-reducing power generation energy-saving device is composed of a plurality of high-pressure tanks 12 and low-pressure tanks 16, and a set of vertical impulse turbine generator sets with at least two runners and eight nozzles. The vertical impulse turbine generator set is composed of a turbine 80 and a generator 81 assembled as a whole. The turbine is composed of a casing 89, an upper runner 84 and at least the first, second, third, fourth, and upper nozzles 19, 29, 39, and 49 relative to the periphery, a lower runner 86 and the first, second, third, and fourth lower nozzles 18, 28, 38, and 48 relative to the periphery. The generator 81 is installed on the upper side of the turbine casing 80, and the generator shaft 83 extends into the turbine. A sealing device 82 is provided on the shaft 83. The first upper runner 84 and the first lower runner 86 of the turbine are directly fixed on the generator shaft 83 through a locking nut 85. Compressed air is introduced into the upper part of the turbine housing 89 through an air inlet valve 100. A water tank 90 is provided at the lower part of the turbine housing and water is introduced into the housing through an inlet valve 200. The upper and lower nozzles of the turbine, the generator 81 and the turbine housing 89 are reliably sealed and connected. During operation, it is necessary to ensure that the internal pressure of the compressed air in the upper part of the turbine housing 89 is greater than the outlet pressure of the natural gas, and the annular high-pressure inlet pipe 61 and the low-pressure outlet pipe 64 are connected to the high-pressure tank and the low-pressure tank respectively through valves.

[0005] The tops of the 1st, 2nd, 3rd, 4th high-pressure tanks 12, 22, 32, 42 are connected to the high-pressure air intake pipe 61 through the 1st, 2nd, 3rd, 4th valves 11, 21, 31, 41, the bottoms of the 1st, 2nd, 3rd, 4th high-pressure tanks are connected to the 1st, 2nd, 3rd, 4th upper nozzles 19, 29, 39, 49 of the turbine respectively, and the tops of the 1st, 2nd, 3rd, 4th low-pressure tanks 16, 26, 36, 46 are connected to the high-pressure air intake pipe 61 through the 5th, 6th, 7th, 8th valves 15, 25, 35, 45 respectively. The 1st, 2nd, 3rd and 4th low-pressure tanks are connected to the 1st, 2nd, 3rd and 4th lower nozzles 18, 28, 38 and 48 of the turbine respectively, the 1st to 4th high-pressure tanks are connected to the tops of the 1st to 4th low-pressure tanks 1 through the 9th, 10th, 11th and 12th valves 14, 24, 34 and 44 respectively, the outlet pipe of the water tank 90 at the lower part of the turbine casing is connected to the bottoms of the high and low-pressure tanks respectively after passing through the main outlet valve 70, and the 13th to 20th valves are arranged in each connecting pipe.

[0006] The spray needle rod 87 of the upper and lower spray pipes is equipped with a hydraulic cylinder 88, and hydraulic oil is used to drive the spray needle rod 87 to move linearly to adjust the water output of the spray pipe. A corresponding hydraulic tank is equipped to ensure the driving force for the spray needle rod 87 to move linearly, and an electromagnetic valve is used to control the water output of the spray pipe.

[0007] All valves are pneumatically or hydraulically operated, and the corresponding air pressure tanks or hydraulic tanks are used to ensure the driving force for the valves. Solenoid valves are used to control the pneumatic or hydraulic opening, holding, and closing of the valves.

[0008] When the pressure difference between the natural gas inlet and outlet is large, the upper impeller 84 and the lower impeller 86 adopt a Pelton impeller; when the pressure difference between the natural gas inlet and outlet is small, the upper impeller 84 adopts a Pelton impeller and the lower impeller 86 adopts an oblique impact impeller.

[0009] When the pressure difference between the natural gas inlet and outlet is large, an intermediate pressure tank is added between each set of high-pressure tanks and low-pressure tanks, and an intermediate runner and a circle of intermediate nozzles are added to the corresponding turbine.

[0010] The operation steps are as follows:

[0011] Before starting, fill the lower part of the turbine and all high-pressure and low-pressure tanks with water through the water inlet valve 200, close all valves and nozzles, and inject compressed air into the upper part of the turbine through the air inlet valve 100.

[0012] 1) Open the main air intake valve 60, open the first valve 11, open the first upper nozzle 19, and the water in the first high-pressure tank 12 is pushed by the high-pressure gas to be ejected to the upper rotor 84 through the first upper nozzle 19, and the upper rotor 84 rotates to drive the generator 81 to generate electricity.

[0013] 2) When the high-pressure gas in the first high-pressure tank 12 reaches a certain height, the first valve 11 is closed, and the gas in the first high-pressure tank 12 expands and continues to push the water in the first high-pressure tank 12 to eject toward the upper runner 84, driving the generator 81 to generate electricity. At the same time, the third valve 31 is opened, and the third upper nozzle 39 is opened. Under the push of the high-pressure gas, the water in the third high-pressure tank 32 is ejected toward the upper runner 84 through the third upper nozzle 39, and the upper runner 84 rotates to drive the generator 81 to generate electricity.

[0014] 3) When there is only a small amount of water left in the first high-pressure tank 12 and the gas basically fills the first high-pressure tank 12, the first upper nozzle 19 is closed, and the ninth valve 14 connecting the first high-pressure tank 12 and the first low-pressure tank 16 is opened at the same time, and the first lower nozzle 18 is opened at the same time, the gas in the first high-pressure tank 12 continues to expand and enters the first low-pressure tank 16 to push the water therein, and is ejected to the lower runner 86 through the first lower nozzle 18, driving the generator 81 to generate electricity, and at the same time the third valve 31 is closed, and the gas in the third high-pressure tank 32 expands and continues to push the water therein to eject to the upper runner 84, driving the generator 81 to generate electricity, and at the same time the second valve 21 is opened, and the second upper nozzle 29 is opened, and the water in the second high-pressure tank 22 is ejected to the upper runner 84 through the second upper nozzle 29 under the push of the high-pressure gas, driving the generator 81 to generate electricity,

[0015] 4) When there is only a small amount of water left in the first low-pressure tank 16 and the gas basically fills the first low-pressure tank 16, close the first lower nozzle 18, then open the main gas outlet valve 63, open the fifth valve 15, and the decompressed gas in the first high-pressure tank 12 and the first low-pressure tank 16 is exhausted through the low-pressure gas outlet pipe 64, then open the main water outlet valve 70 and the 13th and 17th valves 13, 17, and the water in the turbine flows into the first high-pressure tank 12 and the first low-pressure tank 16 because the pressure of the compressed air is greater than the gas outlet pressure. At the same time, open the fourth valve 41, open the fourth upper nozzle 49, and the water in the fourth high-pressure tank 42 is pushed by the high-pressure gas to be ejected to the upper runner 84 through the fourth upper nozzle 49, driving the generator 81 to generate electricity.

[0016] 5) When the first high-pressure tank 12 and the first low-pressure tank 16 are almost filled with water, the 13th and 17th valves 13, 17 are closed, and the 9th valve 14 and the 5th valve 15 are closed at the same time. At this time, the first high-pressure tank 12 and the first low-pressure tank 16 have completed the whole process of air intake, expansion and decompression, air supply, water intake, and power generation.

[0017] 6) Open the first valve 11 again, open the first upper nozzle 19, and the water in the first high-pressure tank 12 is pushed by the high-pressure gas to be ejected to the upper rotor 84 through the first upper nozzle 19, and the upper rotor 84 rotates to drive the generator 81 to generate electricity, and repeat the above process of air intake, expansion and decompression, air supply, water intake, and power generation and energy saving. The other groups of high-pressure tanks and low-pressure tanks also complete the process of air intake, expansion and decompression, air supply, water intake, and power generation and energy saving with this group of high-pressure tanks and low-pressure tanks, and then repeat the process of air intake, expansion and decompression, air supply, water intake, and power generation and energy saving.

[0018] When the device needs to stop running, each set of high-pressure tanks and low-pressure tanks closes valves 13-20 when they are filled with water, and valves 9-12 and valves 5-8 are closed at the same time, and finally the main air inlet valve 61, the main water outlet valve 70, and the main air outlet valve 63 are closed.

[0019] The advantages of the present invention are as follows:

[0020] In a large number of natural gas transmission pipelines, pressure reducing valves are used to reduce the pressure of natural gas, but the energy of natural gas pressure reduction is wasted. In addition, during the pressure reduction process, the temperature of natural gas decreases and may freeze, affecting its use. It is often necessary to heat the natural gas in a water bath in advance to consume energy. The present invention is used in a natural gas pressure reducing station and can be used in parallel with a pressure reducing valve to convert the pressure energy of natural gas into electricity for use, and save the energy consumed by heating the natural gas in a water bath, thereby achieving the purpose of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the present invention.

[0022] Figure 2 It is a schematic diagram of the structure of four groups of air pressure tubes of the present invention. DETAILED DESCRIPTION

[0023] like Figure 1As shown, it is composed of a plurality of high-pressure tanks 12 and low-pressure tanks 16, and a set of vertical impulse turbine generator sets with at least two runners and eight nozzles. The vertical impulse turbine generator set is composed of a turbine 80 and a generator 81 assembled as a whole. The turbine is composed of a casing 89, an upper runner 84 and at least four upper nozzles 19 relative to each other on the periphery, a lower runner 86 and at least four lower nozzles 18 relative to each other on the periphery. The generator 81 is installed on the upper part of the turbine casing 80, and the generator shaft 83 extends into the turbine. A sealing device 82 is provided on the generator shaft 83. The upper runner 84 and the lower runner 86 of the turbine are directly fixed on the generator shaft 83 through a locking nut 85. Compressed air is charged into the upper part of the turbine casing 89 through a valve 100, and a water tank 90 is provided at the lower part of the turbine casing to charge water through a valve 200. The turbine upper nozzle 19 and lower nozzle 18, the generator 81 and the turbine casing 89 are reliably sealed and connected. During operation, it is necessary to ensure that the internal pressure of the upper part of the turbine casing 89 is greater than the natural gas outlet pressure.

[0024] The top of the high-pressure tank 12 is connected to the high-pressure air inlet pipeline 61 through the air inlet valve 11, and the bottom thereof is connected to the upper nozzle 19 of the turbine. The top of the low-pressure tank 16 is connected to the low-pressure air outlet pipe 64 through the air outlet valve 15, and the bottom thereof is connected to the lower nozzle 18 of the turbine. The top of the high-pressure tank 12 is connected to the top of the low-pressure tank 16 through the valve 14. The outlet pipe of the water tank 90 at the lower part of the turbine housing is respectively connected to the bottom of each high-pressure tank 12 and the low-pressure tank 16 through the main outlet valve 70, and an inlet valve 13 and 17 are provided in each connecting pipe.

[0025] All nozzles adopt the structure commonly used in modern water turbines. The nozzle needle rod 87 is equipped with a hydraulic cylinder 88. Hydraulic oil is used to drive the nozzle needle rod 87 to move linearly to adjust the water output of the nozzle. Corresponding hydraulic tanks are equipped to ensure the driving force for the nozzle needle rod 87 to move linearly. The electromagnetic valve is used to control and adjust the water output of the nozzle, so that automatic control can be easily achieved.

[0026] All valves are pneumatically or hydraulically operated, and the corresponding air pressure tanks or hydraulic tanks are used to ensure the driving force for the valves. Solenoid valves are used to control the pneumatic or hydraulic opening, holding, and closing of the valves, which can easily achieve automatic control.

[0027] When the pressure difference between the natural gas inlet and outlet is large, the upper impeller 84 and the lower impeller 86 adopt a Pelton impeller; when the pressure difference between the natural gas inlet and outlet is small, the upper impeller 84 adopts a Pelton impeller and the lower impeller 86 adopts an oblique impact impeller.

[0028] When the pressure difference between the natural gas inlet and outlet is large, an intermediate pressure tank can be added between each set of high-pressure tanks and low-pressure tanks, and an intermediate runner and a circle of intermediate nozzles can be added to the corresponding turbine to reduce the water pressure variation range of each runner, thereby making the turbine more efficient.

[0029] When the natural gas inlet and outlet volume is small, the high-pressure tank and the low-pressure tank can be combined into one tank to save cost. However, the outlet pipe below needs to be forked to connect with the upper nozzle and the lower nozzle.

[0030] When the natural gas inlet and outlet volumes are large, the number of high-pressure tanks and low-pressure tanks can be increased to 6 or 8 groups, and each runner of the corresponding turbine corresponds to 6 or 8 nozzles.

[0031] The invention is implemented in such a way that Figure 2 The following is an example of the structure of the four groups of air pressure tubes shown:

[0032] 1) Before starting, fill the lower part of the turbine and all high-pressure and low-pressure tanks with water through valve 200, close all valves and nozzles. Fill the upper part of the turbine with compressed air through valve 100.

[0033] 2) Open the main air intake valve 60, open the air intake valve 11, open the nozzle 19, and the water in the high-pressure tank 12 is pushed by the high-pressure gas to be ejected to the upper wheel 84 through the nozzle 19, and the upper wheel 84 rotates to drive the generator 81 to generate electricity.

[0034] 3) When the high-pressure gas in the high-pressure tank 12 reaches a certain height, the air inlet valve 11 is closed, and the gas in the high-pressure tank 12 expands and continues to push the water in the high-pressure tank 12 to eject toward the upper wheel 84, driving the generator 81 to generate electricity. At the same time, the air inlet valve 31 is opened, the nozzle 39 is opened, and the water in the high-pressure tank 32 is pushed by the high-pressure gas to eject toward the upper wheel 84 through the nozzle 99, and the upper wheel 84 rotates to drive the generator 81 to generate electricity.

[0035] 4) When there is only a small amount of water left in the high-pressure tank 12 and the gas basically fills the high-pressure tank 12, the nozzle 19 is closed, and the valve 14 connecting the first high-pressure tank 12 and the first low-pressure tank 16 is opened at the same time, and the lower nozzle 18 is opened at the same time, the gas in the first high-pressure tank 12 continues to expand and enters the first low-pressure tank 16 to push the water therein, and is ejected to the lower rotor 86 through the nozzle 18, driving the generator 81 to generate electricity; at the same time, the air intake valve 31 is closed, and the gas in the third high-pressure tank 32 expands and continues to push the water therein to eject to the upper rotor 84, driving the generator 81 to generate electricity; at the same time, the air intake valve 21 is opened, and the nozzle 29 is opened, and the water in the second high-pressure tank 22 is pushed by the high-pressure gas and ejected to the upper rotor 84 through the nozzle 99, driving the generator 81 to generate electricity.

[0036] 5) When there is only a small amount of water left in the first low-pressure tank 16 and the gas basically fills the first low-pressure tank 16, the nozzle 18 is closed, and then the main gas outlet valve 63 is opened, and the gas outlet valve 15 is opened, and the gas after decompression in the first high-pressure tank 12 and the first low-pressure tank 16 is exhausted through the low-pressure gas outlet pipe 64, and then the main water outlet valve 70 and the water inlet valves 13 and 17 are opened, and the water in the turbine flows into the first high-pressure tank 12 and the first low-pressure tank 16 because the pressure of the compressed air is greater than the gas outlet pressure. At the same time, the air inlet valve 41 is opened, the nozzle 49 is opened, and the water in the fourth high-pressure tank 42 is pushed by the high-pressure gas and ejected to the upper runner 84 through the nozzle 99, driving the generator 81 to generate electricity.

[0037] 6) When the first high-pressure tank 12 and the first low-pressure tank 16 are almost full of water, the water inlet valves 13 and 17 are closed, and the valve 14 and the air outlet valve 15 are closed at the same time. At this time, the first high-pressure tank 12 and the first low-pressure tank 16 complete the whole process of air intake, expansion and decompression, air supply, water intake, power generation and energy saving.

[0038] 7) Open the air intake valve 11 again, open the nozzle 19, and the water in the first high-pressure tank 12 is ejected to the upper wheel 84 through the nozzle 19 under the push of the high-pressure gas, and the upper wheel 84 rotates to drive the generator 81 to generate electricity. Repeat the above process of air intake, expansion and decompression, air supply, water intake, power generation and energy saving. The other groups of high-pressure tanks and low-pressure tanks also complete the process of air intake, expansion and decompression, air supply, water intake, power generation and energy saving with this group of high-pressure tanks and low-pressure tanks, and then repeat the process of air intake, expansion and decompression, air supply, water intake, power generation and energy saving.

[0039] When the device needs to stop running, each group of high-pressure tanks and low-pressure tanks closes the water inlet valves 13 and 17 when they are filled with water, and at the same time closes the valve 14 and the air outlet valve 15, and finally closes the main air inlet valve 60, the main water outlet valve 70, and the main air outlet valve 63.

[0040] The purpose of using 4, 6, and 8 groups of high-pressure tanks and low-pressure tanks is to achieve continuous and stable air supply. At the same time, the turbine generator generates electricity continuously and stably with small power changes, the turbine nozzle opens and closes symmetrically, the force on the runner is nearly symmetrical, the force on the turbine bearing is reduced, the failure rate is lower, the cost is reduced, and the service life is long.

Claims

1. A gas decompression power generation energy-saving device, characterized in that: The invention is composed of a plurality of high-pressure tanks and low-pressure tanks, and a set of vertical impulse turbine generator sets having at least two runners and eight nozzles. The vertical impulse turbine generator set is composed of a turbine (80) and a generator (81) assembled as a whole. The turbine is composed of a casing (89), an upper runner (84) and at least the first, second, third, and fourth upper nozzles (19), (29), (39), and (49) which are opposite to each other on the periphery, and a lower runner (86) and the first, second, third, and fourth lower nozzles (18), (28), (38), and (48) which are opposite to each other on the periphery. The generator is installed on the upper side of the turbine casing, and the generator shaft (83) extends into the turbine. A sealing device (82) is provided on the shaft. The upper runner (84) and the lower runner (86) of the turbine are directly fixed to the generator shaft (83) through a locking nut (85). Compressed air is introduced into the upper part of the turbine housing (89) through an air inlet valve (100). A water tank (90) is provided at the lower part of the turbine housing and water is introduced into the lower part through a water inlet valve (200). The upper and lower nozzles of the turbine, the generator (81) and the turbine housing (89) are reliably sealed and connected. During operation, it is necessary to ensure that the internal pressure of the compressed air in the upper part of the turbine housing is greater than the outlet pressure of the natural gas. The high-pressure air inlet pipe (61) and the low-pressure air outlet pipe (64) are connected to the high-pressure tank and the low-pressure air outlet pipe (64) through valves, respectively. The tops of the first, second, third, and fourth high-pressure tanks (12), (22), (32), and (42) are connected to the high-pressure air inlet pipe (61) through the first, second, third, and fourth valves (11), (21), (31), and (41), and the bottoms of the first, second, third, and fourth high-pressure tanks are connected to the first, second, third, and fourth upper nozzles (19), (29), (39), and (49) of the turbine, respectively. The tops of the first, second, third, and fourth low-pressure tanks (16), (26), (36), and (46) are connected to the low-pressure air outlet pipe (64) through the fifth, sixth, seventh, and eighth valves (15), (25), (35), and (45), respectively. ), the bottoms of the first, second, third and fourth low-pressure tanks are respectively connected to the first, second, third and fourth lower nozzles (18) of the turbine, the tops of the first, second, third and fourth high-pressure tanks (12), (22), (32) and (42) are respectively connected to the tops of the first, second, third and fourth low-pressure tanks (16), (26), (36) and (46) through the ninth, tenth, eleventh and twelfth valves (14), (24), (34) and (44), the outlet pipe of the water tank (90) at the lower part of the turbine casing is respectively connected to the connecting pipes at the bottoms of the high and low-pressure tanks through the main outlet valve (70), and valves 13 to 20 are respectively arranged in each connecting pipe.

2. The gas decompression power generation energy-saving device according to claim 1, characterized in that: The spray needle rods (87) of the upper and lower spray pipes are equipped with hydraulic cylinders (88), and hydraulic oil is used to drive the spray needle rods (87) to move linearly to adjust the water output of the spray pipes. Corresponding hydraulic tanks are equipped to ensure the driving force for the spray needle rods (87) to move linearly, and a solenoid valve is used to control the water output of the spray pipes.

3. The gas decompression power generation energy-saving device according to claim 1, characterized in that: All valves are pneumatically or hydraulically operated, and the corresponding air pressure tanks or hydraulic tanks are used to ensure the driving force for the valves. Solenoid valves are used to control the pneumatic or hydraulic opening, holding, and closing of the valves.

4. The gas decompression power generation energy-saving device according to claim 1, characterized in that: When the pressure difference between the natural gas inlet and outlet is relatively large, the upper impeller (84) and the lower impeller (86) are Pelton-type impellers; when the pressure difference between the natural gas inlet and outlet is relatively small, the upper impeller (84) is a Pelton-type impeller and the lower impeller (86) is an oblique-impact impeller.

5. The gas decompression power generation energy-saving device according to claim 1, characterized in that: When the pressure difference between the natural gas inlet and outlet is large, an intermediate pressure tank is added between each set of high-pressure tanks and low-pressure tanks, and an intermediate runner and a circle of intermediate nozzles are added to the corresponding turbine.

6. The gas decompression power generation energy-saving device according to claim 1, characterized in that: Before starting, fill the lower part of the turbine and all high-pressure and low-pressure tanks with water through the water inlet valve (200), close all valves and nozzles, and inject compressed air into the upper part of the turbine through the air inlet valve (100). The operation steps are as follows: 1) Open the main air intake valve (60), open the first valve (11), open the first upper nozzle (19), and the water in the first high-pressure tank (12) is ejected toward the upper rotor (84) through the first upper nozzle under the impetus of the high-pressure gas, and the upper rotor rotates to drive the generator (81) to generate electricity. 2) When the high-pressure gas in the first high-pressure tank (12) reaches a certain height, the first valve (11) is closed, and the gas in the first high-pressure tank expands and continues to push the water in the first high-pressure tank to eject toward the upper rotor (84), driving the generator to generate electricity. At the same time, the third valve (31) is opened, and the third upper nozzle (39) is opened. Under the push of the high-pressure gas, the water in the third high-pressure tank (32) is ejected toward the upper rotor (84) through the third upper nozzle, and the upper rotor rotates to drive the generator to generate electricity. 3) When only a small amount of water remains in the first high-pressure tank (12) and the gas basically fills the first high-pressure tank, the first upper nozzle (19) is closed, and the ninth valve (14) connecting the first high-pressure tank and the first low-pressure tank (16) is opened at the same time, and the first lower nozzle (18) is opened at the same time, so that the gas in the first high-pressure tank (12) continues to expand and enters the first low-pressure tank to push the water therein, and is ejected to the lower rotor (86) through the first lower nozzle (18), driving the generator to generate electricity. At the same time, the third valve (31) is closed, and the gas in the third high-pressure tank (32) continues to expand and push the water therein to eject to the upper rotor (84), driving the generator (81) to generate electricity. At the same time, the second valve (21) is opened, and the second upper nozzle (29) is opened. Under the push of the high-pressure gas, the water in the second high-pressure tank (22) is ejected to the upper rotor through the second upper nozzle, driving the generator to generate electricity. 4) When only a small amount of water remains in the first low-pressure tank (16) and the gas substantially fills the first low-pressure tank, the first lower nozzle (18) is closed, and then the main gas outlet valve (63) is opened, and the fifth valve (15) is opened. The gas after decompression in the first high-pressure tank (12) and the first low-pressure tank (16) is exhausted through the low-pressure gas outlet pipe (64). Then the main water outlet valve (70) and the 13th and 17th valves (13) and (17) are opened. Since the pressure of the compressed air is greater than the gas outlet pressure, the water in the turbine flows into the first high-pressure tank (12) and the first low-pressure tank (16). At the same time, the fourth valve (41) is opened, and the fourth upper nozzle (49) is opened. Under the impetus of the high-pressure gas, the water in the fourth high-pressure tank (42) is ejected toward the upper impeller through the fourth upper nozzle, thereby driving the generator to generate electricity. 5) When the first high-pressure tank and the first low-pressure tank are almost filled with water, the 13th and 17th valves (13) and (17) are closed, and the 9th valve (14) and the 5th valve (15) are closed at the same time. At this time, the first high-pressure tank and the first low-pressure tank have completed the entire process of air intake, expansion and decompression, air supply, water intake, and power generation. 6) Open the first valve (11) again, open the first upper nozzle (19), and the water in the first high-pressure tank is ejected to the upper rotor through the first upper nozzle under the impetus of the high-pressure gas, and the upper rotor rotates to drive the generator to generate electricity, and repeat the above process of air intake, expansion and decompression, air supply, water intake, and power generation and energy saving. The other groups of high-pressure tanks and low-pressure tanks also complete the whole process of air intake, expansion and decompression, air supply, water intake, and power generation and energy saving with this group of high-pressure tanks and low-pressure tanks, and then repeat the whole process of air intake, expansion and decompression, air supply, water intake, and power generation and energy saving. When the device needs to stop running, each group of high-pressure tanks and low-pressure tanks closes the 13th to 20th valves when they are filled with water, and closes the 9th to 12th valves and the 5th to 8th valves at the same time, and finally closes the total air intake valve (60), the total water outlet valve (70), and the total air outlet valve (63).

Images