A gas water pressure working system and control method

Abstract

The present invention provides a gas-water pressure working system and control method, including: a gas pressurizing module, which can switch the gas side or the air pressure side to provide a high-pressure gas source to the pressure tank group based on a control instruction; the pressure tank group includes a plurality of pressure water tanks, which can receive the high-pressure gas source provided by the gas pressurizing module in a decoupled manner, and can provide a high-pressure water source to the turbine in a decoupled manner; the turbine is used to withstand the high-pressure water source and convert it into mechanical energy. The gas pressurizing module is provided with two high-pressure gas sources on the gas side and the air pressure side. According to the current control instruction, a better high-pressure gas source can be selected for transmission, so as to make more appropriate adaptive regulation during the low and peak times of the power grid; each pressure water tank can receive the high-pressure gas source and transmit the high-pressure water source in a decoupled manner. The pressure water tank acts as an energy storage module, which can store an appropriate amount of high-pressure water source in batches when the power grid is at a low point. When it needs to be released, it can be decoupled to control the supply of high-pressure water source to the turbine, and the turbine can participate in power generation.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas power generation systems, and in particular relates to a gas water pressure power generation system and a control method thereof. Background Art

[0002] The gas power generation system is generally composed of a gas turbine, a steam turbine, a generator, a heat exchanger, a pump, etc. In a combined cycle unit, air is compressed by an air compressor and sent to the combustion chamber. The compressed air is mixed with the injected fuel and burned to form high-temperature and high-pressure gas. The gas working medium with the ability to perform work enters the combustion turbine to expand and perform work; after performing work, the gas with a relatively high temperature still enters the waste heat boiler. At this time, the waste heat of the gas converts the water in the steam-water system into high-temperature and high-pressure steam. The steam working medium with the ability to perform work enters the steam turbine to expand and perform work. The exhaust steam of the steam turbine is cooled into water through the condenser, and then heated by various levels of heaters and enters the waste heat boiler again to complete the steam cycle; the low-temperature flue gas after the heat exchange between the gas and the feed water in the waste heat boiler is discharged into the atmosphere through the flue, completing the gas cycle.

[0003] However, this traditional gas-fired power generation system has poor adjustability and cannot meet today's requirements for deep participation in grid peak regulation. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a gas water pressure working system and a control method, which are mainly used to solve the problems of poor adjustability of the existing gas working system when facing the demand of deep participation in peak load regulation.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention provides a gas water pressure working system, comprising:

[0007] The gas pressurization module can switch the gas side or the air pressure side to provide high-pressure gas source to the pressure tank group based on the control instructions;

[0008] A pressure tank group, including a plurality of pressure water tanks, which can receive the high-pressure gas source provided by the gas pressurizing module in a decoupled manner, and can provide a high-pressure water source to the turbine in a decoupled manner;

[0009] A water turbine is used to withstand high-pressure water and convert it into mechanical energy.

[0010] In some embodiments, it also includes:

[0011] A gas pressure storage tank, one end of which is connected to the gas pressurization module, and the other end of which is connected to the water supply tank;

[0012] A water replenishing tank, used to receive the gas pressure of the gas pressure storage tank, and can replenish water to one or more of the several pressure water tanks;

[0013] A water inlet valve is provided at the water inlet end of each pressure water tank.

[0014] In some embodiments, the gas pressurization module includes an air compressor, a compressed air storage tank, a fuel tank, a gas generator, and an expansion chamber;

[0015] The air compressor is used to provide compressed air to the compressed air storage tank;

[0016] The compressed air storage tank is used to provide compressed air to the gas generator;

[0017] The fuel tank is used to provide fuel to the gas generator;

[0018] The gas generator is used to receive the fuel and compressed air and burn them, and store the generated high-pressure gas source in the expansion chamber;

[0019] The expansion chamber is connected to each of the pressure water tanks through a high-pressure gas pipe, and an air intake valve is provided at the air intake end of each of the pressure water tanks.

[0020] In some embodiments, it also includes:

[0021] An exhaust gas turbocharger is connected to the gas generator and / or each of the pressure water tanks through an exhaust pipe, uses the exhaust gas for pressurization, and stores the compressed air in a compressed air storage tank;

[0022] An exhaust valve is provided at the exhaust end of each of the pressure water tanks.

[0023] In some embodiments, it also includes:

[0024] The circulating water tank is used to receive the water source after the water turbine has done work, and is connected to the water supply tank through a connecting vessel and a check valve.

[0025] In a second aspect, the present invention provides a method for controlling gas water pressure work, which is applied to a gas water pressure work system as described above, and comprises the following steps:

[0026] Control the gas pressurization module to start, and increase the air pressure to the preset pressure range on the air compression side;

[0027] The high-pressure air from the air compressor side is input into the gas side, and combustion generates a high-pressure gas source;

[0028] Replenish water to each pressure water tank to the preset water level La;

[0029] Control the delivery of high-pressure gas source to each pressure water tank in sequence, so that each pressure water tank provides high-pressure water source to the turbine in sequence.

[0030] In some embodiments, based on the current water level and / or air pressure value of the previous pressure water tank, the air inlet valve and the drain valve of the next pressure water tank are opened in advance to complete the switching transition between the front and rear pressure water tanks.

[0031] In some embodiments, a high-pressure gas source is delivered to the first pressure water tank so that it provides a high-pressure water source to the water turbine;

[0032] When the water level in the first pressure water tank drops below Lb, the high-pressure gas source is delivered to the second pressure water tank, so that the second pressure water tank provides the high-pressure water source to the turbine at the same time;

[0033] When the water level in the first pressure water tank drops below Lc, the air inlet valve and the water discharge valve of the first pressure water tank are closed, and the air exhaust valve and the water inlet valve are opened to enter the water replenishment and pressurization process.

[0034] In some embodiments, the high-pressure gas generated after combustion of the gas pressurizing module is stored in a gas pressure storage tank;

[0035] The gas pressure storage tank is used to pressurize the water supply tank, and the water is supplied to the set pressure water tank by controlling the water inlet valve.

[0036] In some embodiments, in combination with grid operation data;

[0037] When the power grid is at a low point, the gas pressurization module is controlled to perform high-pressure gas storage on the air compressor side;

[0038] When the power grid is at its peak, the air compressor side is first used to provide a high-pressure gas source to the pressure tank group. When the pressure on the air compressor side drops to a preset threshold, compressed air is then provided to the gas side through the air compressor side to control the operation of the gas side and provide a high-pressure gas source to the pressure tank group.

[0039] Compared with the prior art, the present invention has at least the following beneficial effects:

[0040] The gas pressurization module is equipped with two high-pressure gas sources, one on the gas side and the other on the air compression side. According to the current control instructions, a better high-pressure gas source can be selected for transmission, so as to make more appropriate adaptive control during the low and peak hours of the power grid;

[0041] Each pressure water tank can receive high-pressure gas source and transport high-pressure water source in a decoupled manner. The pressure water tank acts as an energy storage module, which can store appropriate amount of high-pressure water source in batches when the power grid is at a low point. When it needs to be released, it can be decoupled to control the supply of high-pressure water source to the turbine, and the turbine can participate in power generation.

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0044] Figure 1 It is a structural schematic diagram of a gas water pressure working system provided in this embodiment.

[0045] Figure 2 It is a schematic structural diagram of the pressure tank group in this embodiment.

[0046] Figure 3 Schematic diagram of the structure of the gas generator in this embodiment. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] In the description of the present invention, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0050] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0051] First, refer to Figures 1 to 3 The embodiment of the present invention provides a gas water pressure working system, including:

[0052] The gas pressurization module can switch the gas side or the air compression side to provide high-pressure gas source to the pressure tank group based on the control instructions; the control instructions can be the power grid operation data. According to the actual operation data of the current power grid, the corresponding control instructions are formulated to control the more appropriate gas side or air compression side to work;

[0053] The pressure tank group includes several pressure water tanks, which can receive the high-pressure gas source provided by the gas pressurizing module in a decoupled manner, and can provide the high-pressure water source to the turbine in a decoupled manner; the gas pressurizing module can specifically pressurize a specific pressure water tank. Since the pressure water tank stores a normal-pressure water source, when the high-pressure gas source is applied, it is equivalent to storing energy in the pressure water tank. According to the current control instructions, several pressure water tanks are pressurized in advance to store energy;

[0054] A water turbine is used to withstand high-pressure water and convert it into mechanical energy.

[0055] Preferably, the turbine is used to generate electricity after being subjected to a high-pressure water source.

[0056] In this embodiment, it also includes:

[0057] A gas pressure storage tank is connected to the gas pressurization module at one end and to the water supply tank at the other end. The high-pressure gas generated by the combustion of the gas pressurization module is stored in the gas pressure storage tank. When needed, the gas pressure storage tank is used to supply gas to the water supply tank.

[0058] A water supply tank is used to receive the gas pressure from the gas pressure storage tank and can supply water to one or more of the several pressure water tanks;

[0059] A water inlet valve is provided at the water inlet end of each pressure water tank.

[0060] By controlling the corresponding water inlet valve, the pressure water tank corresponding to the water replenishment tank is controlled to replenish water.

[0061] The gas pressurization module includes an air compressor, a compressed air storage tank, a fuel tank, a gas generator and an expansion chamber;

[0062] The air compressor is used to provide compressed air to the compressed air storage tank; the air compressor is connected to the power grid;

[0063] The compressed air storage tank is used to provide compressed air to the gas generator;

[0064] The fuel tank is used to supply fuel to the gas generator;

[0065] The gas generator is used to receive fuel and compressed air and burn them to produce high-temperature and high-pressure gas, and store the produced high-pressure gas source in the expansion chamber;

[0066] The expansion chamber is connected to each pressure water tank through a high-pressure gas pipe, and an air intake valve is provided at the air intake end of each pressure water tank.

[0067] After the compressed air and fuel are burned, the high-pressure gas source generated can be stored in the expansion chamber. The expansion chamber serves as a pressure tank body and can control the supply of high-pressure gas source to a specific pressure water tank by controlling the air inlet valve.

[0068] In this embodiment, it also includes:

[0069] An exhaust gas turbocharger is connected to the gas generator and / or each pressure water tank through an exhaust pipe, uses the exhaust gas for pressurization, and stores the compressed air in a compressed air storage tank;

[0070] An exhaust valve is provided at the exhaust end of each pressure water tank.

[0071] Since the gas generator and each pressure water tank will discharge exhaust gas, the exhaust gas is pressurized by the exhaust gas turbocharger, and the compressed air is then transported to the compressed air storage tank.

[0072] Also includes:

[0073] The circulating water tank is used to receive the water source after the turbine has completed work, and is connected to the water supply tank through a connecting vessel and a check valve.

[0074] The following examples are provided to further illustrate the present invention, but the scope of the present invention is not limited thereto.

[0075] Combination Figures 1 to 3 In this embodiment, the gas water pressure working system includes an air compressor, a compressed air storage tank group, a gas generator, a pressure tank group, a high-pressure water jet pipe, a turbine, a water supply tank, a circulating water tank, an exhaust gas turbocharger and related pipelines, control systems, and valves.

[0076] A compressed air storage tank group refers to multiple tanks made of metal or composite materials that can withstand rated pressure (for example, 15 bar) and are connected to the exhaust port of the air compressor and the air inlet of the gas generator through air pipes and valves.

[0077] An air compressor is a machine that uses a motor or turbine to drive a single-stage or multi-stage piston, screw, vane or centrifugal impeller to compress air to a rated pressure.

[0078] A pressure tank group refers to multiple tanks made of metal or composite materials that can withstand rated pressure (for example, 30-50 bar). One end is connected to the gas expansion chamber through a high-pressure gas pipe, and water replenishment is controlled by a water replenishment pipe, an exhaust pipe and a water replenishment valve. Under the action of high-pressure gas, water is controlled to be ejected from the high-pressure jet pipe through a drain valve.

[0079] High-pressure water jet pipe refers to a pressure-resistant water pipe with a controllable convergent outlet, which accelerates the high-pressure water to form a water flow with a certain speed and flow rate, and the water outlet points to the impeller of the hydraulic turbine in the turbine. One end is connected to the pressure water tank through a high-pressure water pipe.

[0080] A gas generator is a device that guides compressed air from a gas tank into a combustion chamber and mixes it with fuel to produce high-temperature and high-pressure gas. It includes an intake valve, an intake port, a secondary exhaust valve, a secondary exhaust port, a cylinder, a combustion chamber, a fuel nozzle, a piston, a return spring, a main exhaust port, a gas expansion chamber, and a high-pressure gas conduit. The intake port is connected to the compressed air storage tank, the fuel nozzle is connected to the fuel tank, the secondary exhaust valve is connected to the gas exhaust pipe, the main exhaust port is connected to the gas expansion chamber, the high-pressure gas conduit is connected to the intake valve of the pressure water tank, and the gas pipe is connected to the gas pressure storage tank through the valve.

[0081] The expansion chamber is a pressure tank connected to the high-pressure gas conduit of the gas generator. It introduces high-temperature and high-pressure gas into the pressure tank group through the gas exhaust pipe.

[0082] The water turbine, preferably an adapted Pelton water turbine, can drive the turbine to drive the working equipment to achieve power output with appropriate efficiency under a smaller flow rate and a higher water flow velocity.

[0083] The circulating water tank is located below the turbine. It receives the water flow after the turbine impacts the impeller and flows into the water supply tank through pipes and valves.

[0084] The water supply tank is connected to the circulating water tank through a connecting vessel and a check valve to receive the circulating water from the circulating water tank; and is connected to the water inlet of the pressure water tank through a water supply pipe and a water supply control valve; when the water level of the pressure water tank drops to the set value, the control system starts the water supply control valve and uses the gas pressure in the gas pressure storage tank to inject the circulating water in the water supply tank into the emptied pressure water tank. The water supply tank is equipped with an exhaust valve to the atmosphere.

[0085] A gas pressure storage tank is a tank made of metal or composite materials that can withstand rated pressure. One end of the tank is connected to the gas expansion chamber through a high-pressure gas pipe, and the other end of the tank is connected to the water tank through a high-pressure gas pipe and a one-way valve.

[0086] The compressed air storage tank is connected to the exhaust pipe of the air compressor and the compressed air exhaust pipe of the exhaust gas turbocharger through pipelines to receive compressed air, and is also connected to the air inlet of the gas generator through a compressed air pipe.

[0087] In the gas-fired power generation mode, the exhaust gas turbocharger has a certain temperature and pressure left after the gas does work, which is discharged from the secondary exhaust port of the gas generator or the exhaust valve of the pressure water tank, driving the turbocharger to compress the air and transport it to the compressed air storage tank. The exhaust gas after work is discharged into the atmosphere.

[0088] Related control valves, including electromagnetic exhaust valves, air intake valves, water supply valves, drain valves, water inlet valves, etc., are opened or stopped according to preset programs to control the operation of the system.

[0089] Combination Figure 2 In a second aspect, the present invention provides a gas water pressure work control method, which is applied to a gas water pressure work system as in the above embodiments, comprising the following steps:

[0090] Control the gas pressurization module to start, and increase the air pressure on the air compression side to a preset pressure range; preferably, the preset pressure range is 10-15 bar;

[0091] The high-pressure air from the air compressor side is input into the gas side for combustion to generate a high-pressure gas source; preferably, the pressure range of the high-pressure gas source is 30-50 bar;

[0092] Replenish water to each pressure water tank to the preset water level La;

[0093] Control the delivery of high-pressure gas source to each pressure water tank in sequence, so that each pressure water tank provides high-pressure water source to the turbine in sequence.

[0094] It should be noted that in this control method, water can be replenished and high-pressure gas source can be delivered to a specific pressure water tank. Each pressure water tank plays the role of energy storage, digesting the excess electric energy in the power grid at this time and storing it in the form of high-pressure water source. When the power grid is short of electric energy, the high-pressure water source is used to do work for the turbine to generate electricity.

[0095] As an implementation method, in order to achieve the sustainability and adjustability of turbine generation, according to the current water level and / or air pressure value of the previous pressure water tank, when the current water level and / or air pressure value of the previous pressure water tank reaches a first set threshold, the air inlet valve and the drain valve of the subsequent pressure water tank are opened in advance to complete the switching transition of the front and rear pressure water tanks, until the current water level and / or air pressure value of the previous pressure water tank reaches a second set threshold, and then the previous pressure water tank is controlled to stop supplying water and re-enter the water replenishment and pressurization process, so that each pressure water tank can be coupled to the working system in turn at an appropriate time, and decoupled from the working system at an appropriate time for charging.

[0096] Preferably, when controlling the sequential delivery of high-pressure gas sources to each pressure water tank, the method includes:

[0097] delivering a high-pressure gas source to the first pressure water tank so that it provides a high-pressure water source to the turbine;

[0098] When the water level in the first pressure water tank drops below Lb, the high-pressure gas source is delivered to the second pressure water tank, so that the second pressure water tank simultaneously provides the high-pressure water source to the turbine; at this time, the first pressure water tank and the second pressure water tank simultaneously provide the high-pressure water source;

[0099] When the water level in the first pressure water tank drops below Lc, the air inlet valve and the drain valve of the first pressure water tank are closed, and the exhaust valve and the water inlet valve are opened to enter the water replenishment and pressurization process; at this time, the high-pressure water source is provided by the second pressure water tank;

[0100] And so on, all the way from the first pressure water tank to the Nth pressure water tank, and then start again from the first pressure water tank.

[0101] In this embodiment, the high-pressure gas generated after the combustion of the gas pressurizing module is stored in a gas pressure storage tank;

[0102] The gas pressure storage tank is used to pressurize the water supply tank, and the water is supplied to the set pressure water tank by controlling the water inlet valve.

[0103] In this embodiment, combined with the grid operation data;

[0104] When the power grid is at a low point, the electricity is sufficient and the electricity price is cheap. The gas pressurization module is controlled to store high-pressure gas on the air compressor side. Specifically, the electrically driven air compressor is controlled to work and store gas in the compressed air storage tank.

[0105] When the power grid is at its peak, the air compressor side is first used to provide a high-pressure gas source to the pressure tank group. When the pressure on the air compressor side drops to a preset threshold, compressed air is then provided to the gas side through the air compressor side to control the operation of the gas side and provide a high-pressure gas source to the pressure tank group.

[0106] Furthermore, at this time, the pressure tank group can also be combined for energy storage. When the power grid is at a low point, in addition to using the air compressor to store gas in the compressed air storage tank, the gas generator and the water supply tank are combined to transport water and provide high-pressure gas sources in the pressure tank group in advance, forming multiple groups of high-pressure water sources. When the turbine is needed to work, the pressure tank group can be decoupled from the gas pressurization module separately, and the pressure tank group and the turbine can be used to form a work subsystem;

[0107] The following examples are provided to further illustrate the present invention, but the scope of the present invention is not limited thereto.

[0108] The working principle of the gas water pressure work control method includes:

[0109] 1. Start the system: If it is the first time to start the machine after the power system is emptied, start the air compressor to compress the air to 10-15bar and store it in the compressed air storage tank group, and control the start and stop of the air compressor through sensors and control systems to keep the pressure at the set value;

[0110] 2. The compressed air tank group opens or closes the air inlet valve when the pressure reaches the set value (for example, 15Bar is closed and 10bar is opened);

[0111] 3. The air in the compressed air storage tank enters the air inlet of the gas generator through the compressed air pipe and the control valve;

[0112] 4. The intake valve of the gas generator is opened under the push of the electromagnetic coil or cam, and the compressed air from the compressed air tank enters the combustion chamber. The intake valve is closed, and the fuel is sprayed from the nozzle into the combustion chamber. The spark plug is ignited, and the mixed gas burns to form high-temperature and high-pressure gas. The pressure pushes the piston to overcome the spring thrust and slide through the main exhaust port. The high-pressure gas enters the expansion chamber through the main exhaust port. The pressure in the combustion chamber is reduced to balance with the pressure in the expansion chamber. The spring rebounds and pushes the piston to reset, slide through the main exhaust valve, and the combustion chamber is in a closed state.

[0113] 5. The secondary exhaust valve of the combustion chamber opens and discharges the remaining gas under the push of the electromagnetic coil or cam, enters the turbine of the exhaust gas turbine supercharger through the secondary exhaust pipe, and is discharged into the atmosphere after working, and the exhaust valve of the combustion chamber is closed. Repeat 4,5 cycles until the pressure in the expansion chamber reaches the preset value (for example, 30-50bar). The compressed air of the exhaust gas turbocharger is discharged into the compressed air storage tank through the pipeline. When starting for the first time or restarting after shutdown and unloading, the gas in the expansion chamber enters the gas pressure storage tank through the high-pressure gas, pressurizes the water supply tank, and replenishes water to each pressure water tank to reach the preset water level height La;

[0114] 6. According to the preset procedure, the air inlet solenoid valve and the drain valve of the No. N pressure water tank are opened, and the high-pressure gas enters the No. N pressure water tank from the expansion chamber; under the action of the gas pressure, the water in the tank is guided by the high-pressure water jet pipe to impact the turbine blades, driving the equipment to do work and then flowing into the open circulation water tank;

[0115] 7. When the water level of the No. N pressure water tank drops to the preset height Lb, the liquid level controller sends a signal to open the air inlet valve and drain valve of the No. N+1 pressure water tank to ensure the continuity of the high-pressure water flow;

[0116] 8. When the water level of the No. N pressure water tank drops to the preset height Lc, the liquid level controller sends a signal to close the drain valve and air inlet valve of the No. N pressure water tank, open the exhaust valve and water inlet valve, and the gas with residual pressure is discharged into the atmosphere after the exhaust gas turbocharger system does work;

[0117] 9. The gas in the gas pressure storage tank pressurizes the water supply tank through the water supply pipe. Under the action of the gas pressure, the water in the water supply tank enters the No. N pressure water tank through the water supply pipe until the water level reaches the preset height La. The liquid level controller sends a signal to close the exhaust valve and water inlet valve of the No. N pressure water tank, and the No. N pressure water tank is in standby state;

[0118] 10. When the pressure in the expansion chamber is lower than the set value, the system repeats the above steps 2-6 to maintain the pressure in the system;

[0119] 11. When the pressure water tank No. N runs to the above step 9, the system control program starts the pressure water tanks in the order of N+1, N+2, N+3, N+4...N, N+1, N+2, N+3, N+4... to provide continuous high-pressure water flow for the system, so that the system can continuously output work;

[0120] 12. When the water level in the water supply tank is lower than the preset height Ld, the liquid level controller sends a signal to close the water supply tank inlet valve and open the water supply tank exhaust valve. The circulating water flows in through the connecting vessel and the check valve. When the water level in the water supply tank reaches the preset height Le, the water supply tank exhaust valve is closed and the water supply tank inlet valve is opened to maintain the pressure in the water supply tank.

[0121] The following provides a gas water pressure working system and control method for the above embodiment, and illustrates examples in practical applications:

[0122] Embodiment 1:

[0123] This embodiment is matched with a compressed air energy storage station for power generation;

[0124] Compressed air energy storage is a mature energy storage system. Now there are application cases that use low-cost electricity from the grid to drive air compressors to store large amounts of compressed air, and use compressed air to drive air turbines to generate electricity during peak electricity consumption. Due to the high cost of high-pressure gas tanks and the large space they occupy, the storage capacity and application scope of this energy storage method are subject to certain restrictions, which is not conducive to large-scale energy storage. In addition, once the compressed air pressure drops to a certain level, the energy storage power station loses its power source and stops generating electricity, and the power generation efficiency of the air turbine is not ideal.

[0125] The present invention is matched with a compressed air energy storage station, and the low-cost electricity during the off-peak hours of the power grid is used to drive the air compressor to compress the air and store it in a high-pressure gas tank. During peak hours of electricity consumption, the water in the pressure tank is pressurized with high-pressure air, and the pressurized water drives the hydraulic turbine generator to generate electricity through the jet pipe; the exhaust gas discharged from the pressure tank still has a certain pressure, which is enough to drive the air turbine to drive the air compressor to compress the air.

[0126] In addition, when the residual pressure of the compressed air reaches the preset value, the system switches to the gas power generation mode. The compressed air enters the gas generator and mixes with the fuel to burn to form high-pressure gas, which continues to pressurize the water in the pressure tank, and drives the hydraulic turbine generator to generate electricity through the jet pipe. The exhaust gas discharged after the first work drives the air turbine to drive the air compressor to replenish the system with compressed air, and finally discharges into the atmosphere. The power generation efficiency of the hydraulic turbine used in the present invention is higher than that of the air turbine, and the energy of compressed air or gas is utilized in a step-by-step manner, which improves the efficiency of the entire system and ensures that power generation can continue after the compressed air is used up.

[0127] Embodiment 2:

[0128] This embodiment is used for energy storage in wind and solar power stations;

[0129] Wind power or photovoltaic power generation, which is widely used now, is easily affected by the weather during the day and night, and the output electric energy changes greatly, thus affecting the stability of the power grid. The present invention is matched with a photovoltaic or wind power plant, and the electricity generated by wind power and photovoltaics is used to drive the air compressor to compress the air and store it in a high-pressure gas tank. During peak electricity consumption, high-pressure air is used to pressurize the water in the pressure tank, and the pressurized water drives the hydraulic turbine generator to generate electricity through the jet pipe; the exhaust gas discharged from the pressure tank still has a certain pressure, which is enough to drive the air turbine to drive the air compressor to compress the air.

[0130] In addition, when the residual pressure of the compressed air reaches the preset value, the system switches to the gas power generation mode. The compressed air enters the gas generator and mixes with the fuel to burn to form high-pressure gas, which continues to pressurize the water in the pressure tank and drives the hydraulic turbine generator to generate electricity through the jet pipe. The exhaust gas discharged after the pressure is reduced drives the air turbine to drive the air compressor to supplement the system with compressed air, and finally discharges into the atmosphere. This matching method improves the sustainability, stability and economic benefits of wind and photovoltaic power generation.

[0131] Embodiment 3:

[0132] This embodiment is used for a marine water jet propulsion system;

[0133] The ideal propulsion system for high-speed ships is water jet propulsion, while the cavitation phenomenon generated by traditional propellers when running at high speed in water will seriously damage the propeller surface and reduce the propulsion efficiency of the propeller. In addition, the mechanical structure of the power system and propulsion system is relatively complex, and the vibration and noise are also very large. The present invention is used as a jet propulsion system, which can replace the propeller or pump propulsion system in some application scenarios.

[0134] Before the ship is started, the air compressor is started with electricity, and compressed air enters the gas tank. When the pressure reaches the preset value, the system switches to the gas water spray mode. The compressed air enters the gas generator and mixes with the fuel to form high-pressure gas to pressurize the water in the pressure tank, and is sprayed into the water outside the hull through the jet pipe to generate thrust, which drives the ship to travel. The exhaust gas discharged after work drives the air turbine to drive the air compressor to supplement the system with compressed air, and finally discharged into the atmosphere. Continuous propulsion is achieved through the aforementioned control steps 1-12.

[0135] Embodiment 4:

[0136] This embodiment is used for a jet pump station;

[0137] Before the pump station is started, the air compressor is electrically started, and compressed air enters the gas tank. When the pressure reaches the preset value, the system switches to the gas water spray mode. The compressed air enters the gas generator and mixes with the fuel to burn to form high-pressure gas to pressurize the water in the pressure tank. It is sprayed into the water of the venturi tube through the jet pipe to produce drainage. Under the suction effect of the drainage, a large amount of water is driven to flow in the pipe. In some application scenarios, it replaces the centrifugal pump or axial flow pump. The exhaust gas discharged after work drives the air turbine to drive the air compressor to supplement the system with compressed air, and finally discharged into the atmosphere. Continuous advancement is achieved through the aforementioned control steps 1-12.

[0138] In summary, compared with the prior art, the above embodiment provides a gas water pressure working system and control method. The gas pressurization module is provided with two high-pressure gas sources on the gas side and the air compression side. According to the current control instructions, a better high-pressure gas source can be selected for transmission, so as to make more appropriate adaptive control during the low and peak hours of the power grid.

[0139] Each pressure water tank can receive high-pressure gas source and transport high-pressure water source in a decoupled manner. The pressure water tank acts as an energy storage module, which can store appropriate amount of high-pressure water source in batches when the power grid is at a low point. When it needs to be released, it can be decoupled to control the supply of high-pressure water source to the turbine, and the turbine can participate in power generation.

[0140] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A gas water pressure working system, characterized in that: include: Gas pressurization module; A pressure tank group, including a plurality of pressure water tanks, which can receive the high-pressure gas source provided by the gas pressurizing module in a decoupled manner, and can provide a high-pressure water source to the turbine in a decoupled manner; The gas pressurizing module includes an air compressor, a compressed air storage tank, a fuel tank, a gas generator and an expansion chamber; The air compressor is used to provide compressed air to the compressed air storage tank; The compressed air storage tank is used to provide compressed air to the gas generator; The fuel tank is used to provide fuel to the gas generator; The gas generator is used to receive the fuel and compressed air and burn them, and store the generated high-pressure gas source in the expansion chamber; The expansion chamber is connected to each of the pressure water tanks through a high-pressure gas pipe, and an air intake valve is provided at the air intake end of each of the pressure water tanks; The gas pressurizing module can switch the expansion chamber or the compressed air storage tank to provide a high-pressure gas source to the pressure tank group based on the control instruction. Water turbines, used to withstand high-pressure water and convert it into mechanical energy; A gas pressure storage tank, one end of which is connected to the expansion chamber of the gas pressurizing module, and the other end of which is connected to a water replenishing tank; A water replenishing tank, used to receive the gas pressure of the gas pressure storage tank, and can replenish water to one or more of the several pressure water tanks; A water inlet valve is provided at the water inlet end of each of the pressure water tanks; An exhaust gas turbocharger is connected to the gas generator and / or each of the pressure water tanks through an exhaust pipe, uses the exhaust gas for pressurization, and stores the compressed air in a compressed air storage tank; An exhaust valve is provided at the exhaust end of each of the pressure water tanks; The circulating water tank is used to receive the water source after the water turbine has done work, and is connected to the water supply tank through a connecting vessel and a check valve.

2. A gas water pressure work control method, applied to a gas water pressure work system as claimed in claim 1, characterized in that: The following steps are involved: Control the gas pressurization module to start, and use the air compressor to increase the air pressure of the compressed air storage tank to a preset pressure range; The high-pressure air in the compressed air storage tank is input into the gas generator for combustion to generate a high-pressure gas source; Replenish water to each pressure water tank to the first preset water level L a ; The high-pressure gas source is controlled to be delivered to each pressure water tank in sequence, so that each pressure water tank provides the high-pressure water source to the turbine in sequence.

3. A method for controlling gas water pressure work as claimed in claim 2, characterized in that: According to the current water level and / or air pressure value of the previous pressure water tank, the air inlet valve and the drain valve of the next pressure water tank are opened in advance to complete the switching transition between the front and rear pressure water tanks.

4. A method for controlling gas water pressure work as claimed in claim 3, characterized in that: The high-pressure gas source is delivered to the front pressure water tank so that it provides the high-pressure water source to the turbine; When the water level in the current pressure water tank drops to the second preset water level L b When the pressure is below 0.05, the high-pressure gas source is delivered to the next pressure water tank, so that the next pressure water tank provides the high-pressure water source to the turbine at the same time; When the water level in the current pressure water tank drops to the third preset water level L c When the pressure drops below 0.05, close the air inlet valve and drain valve of the previous pressure water tank, open its exhaust valve and water inlet valve, and enter the water replenishment and pressurization process.

5. A gas water pressure work control method as claimed in claim 2, characterized in that: The high-pressure gas generated after the combustion of the gas pressurization module is stored in the gas pressure storage tank; The gas pressure storage tank is used to pressurize the water supply tank, and the water is supplied to the set pressure water tank by controlling the water inlet valve.

6. A gas water pressure work control method as claimed in claim 2, characterized in that: Combined with power grid operation data; When the power grid is at a low point, the gas pressurization module is controlled to perform high-pressure gas storage; When the power grid is at its peak, a compressed air storage tank is first used to provide a high-pressure gas source to the pressure tank group. When the pressure in the compressed air storage tank drops to a preset threshold, compressed air is then provided to the gas generator through the compressed air storage tank to control the operation of the gas generator and provide a high-pressure gas source to the pressure water tank.

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