Method for coupling green hydrogen production and storage and hydrogen-doped natural gas flame cutting

Abstract

The invention provides a method for coupling green hydrogen production and storage and hydrogen-doped natural gas flame cutting, and relates to the technical field of energy. The method for coupling green hydrogen production and storage and hydrogen-doped natural gas flame cutting is achieved through cooperation of an ALK hydrogen production system, an energy and gas storage and gas mixing system, a flame cutting system and a central control system. The novel flame cutting device with the matched hydrogen-doped natural gas as the fuel has higher cutting efficiency, precision and stability and plays an important role in reducing energy consumption and reducing material waste, secondly, an energy storage system and real-time weather forecast are subjected to networking coordination intelligent control, new energy can be effectively utilized, and energy conservation and emission reduction are achieved. The energy production and gas storage efficiency is optimized, development and application of a clean energy technology are promoted, the gas supply amount of the energy storage system to the busbar at each point is intelligently adjusted according to different gas consumption amounts of different places of the terminal, and energy conservation and utilization are efficiently achieved.

Description

Technical Field

[0001] The present invention relates to the field of energy technology, and specifically to a method for coupling green hydrogen "production and storage" and hydrogen-blended natural gas flame cutting. Background Art

[0002] Energy is an important material basis for promoting the development of the times. With the development of the times, the total energy consumption has gradually increased, and the demand for clean energy has become more and more urgent. my country's energy structure is also exploring transformation. As a secondary energy with a wide range of sources, clean and carbon-free, flexible and efficient, and rich application scenarios, hydrogen energy has gradually become an important direction of the global energy technology revolution.

[0003] In the energy and power industries, there is a large demand for steel cutting in production, manufacturing and installation. According to the different cutting energy sources used, cutting equipment can be divided into many types. Among them, flame cutting has the advantages of high cutting efficiency, low cost and easy maintenance. It has certain advantages in cutting thick steel plates and cutting various shapes of welding grooves.

[0004] At present, traditional flame cutting equipment mainly uses propane or acetylene as cutting gas. The excellent combustion characteristics of natural gas mixed with hydrogen provide new ideas for the development of the next generation of cutting equipment. Flame cutting technology using hydrogen-mixed natural gas as cutting gas is favored by industrial applications due to its economy, cutting efficiency and wide range of applications. The main advantages of hydrogen-mixed natural gas as cutting gas are reflected in two aspects: (1) It provides a new way to directly utilize hydrogen energy; (2) By adding hydrogen, the temperature of the flame can be greatly increased, thereby improving the cutting speed and cutting quality, especially for the cutting of thick plate materials. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the shortcomings of the prior art, the present invention provides a method for coupling green hydrogen "production and storage" and hydrogen-blended natural gas flame cutting, which solves the problem of high cost caused by traditional use of propane or acetylene as cutting gas.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a method for coupling green hydrogen "production and storage" and hydrogen-blended natural gas flame cutting, which is implemented through the cooperation of ALK hydrogen production system, energy storage and gas blending system, flame cutting system, and central control system, including the following steps:

[0009] Step 1: The ALK hydrogen production system mainly uses water electrolysis hydrogen production technology. Specifically, the gas electrolyzed by the electrolyzer and containing a large amount of alkali liquid is first separated from the alkali liquid by a gas-liquid separation system, and then further washed by a purification system to obtain a small amount of mist alkali liquid and water vapor contained in the gas to obtain pure gas, which is then passed through a cooler and dryer, compressed by a compressor and stored in a gas storage tank;

[0010] Step 2: The energy storage and gas mixing system integrates the regulation and control of hydrogen and natural gas through flow meters, pressure gauges and valves, determines their ratio, and transports them into the flame cutting system;

[0011] Step 3: The flame cutting system performs cutting work through a cutting gun;

[0012] Step 4: The central control system is used to control the operation of the ALK hydrogen production system, energy storage and gas mixing system, and flame cutting system, and to control, adjust and predict.

[0013] Preferably, in step one, the ALK hydrogen production system includes a photovoltaic power generation and storage system, a pure water device, an electrolyzer, a gas-liquid separation system, an oxygen / hydrogen purification system, a cooling and drying system, a compressor, a heat exchanger, an alkali adding tank and an oxygen / hydrogen storage tank.

[0014] Preferably, the power supply end of the electrolyzer is electrically connected to the photovoltaic module and the supplementary power unit of the photovoltaic power generation and power storage system, respectively; the gas outlet of the electrolyzer is connected and fixed to the inlet of the gas-liquid separation system; the gas outlet of the gas-liquid separation system is connected and fixed to the gas inlet of the oxygen / hydrogen purification system; the gas outlet of the oxygen / hydrogen purification system is connected and fixed to the gas inlet of the cooling and drying system; and the cooling and drying system is connected and fixed to the inlet of the oxygen / hydrogen storage tank through a compressor.

[0015] Preferably, the alkali solution required by the electrolytic cell is supplemented by an alkali adding tank equipped with a set of alkali preparation devices; during the electrolysis process of the electrolytic cell, water is supplemented into the system by a pure water device; the alkali solution separated by the gas-liquid separation system enters the heat exchanger and filter from the lower outlet, and the alkali solution after heat exchange and filtration is re-input into the electrolytic cell for recycling.

[0016] Preferably, in step 2, the energy storage, gas storage and gas mixing system is mainly composed of booster pumps corresponding to the two gases, oxygen / hydrogen gas storage tanks, and secondary gas storage tanks connected with a pressure stabilizing effect. Each pipeline is connected to a flow meter, a pressure gauge and a valve to measure and monitor the pressure and flow rate and to coordinate the mixing process.

[0017] Preferably, the oxygen produced by the ALK hydrogen production system is pressurized by a booster pump and filled into an oxygen storage tank, which is connected to a secondary gas storage tank and is also connected to other gas passages so as to operate when the gas tank is full or has other uses.

[0018] Preferably, the hydrogen produced by the ALK hydrogen production system is pressurized by a booster pump and filled into a hydrogen storage tank. The hydrogen storage tank and an external natural gas tank are connected to a primary mixing gas tank, and the mixed gas is filled according to the proportion. Other external gas passages are also connected to operate when the gas tank is full or has other uses.

[0019] Preferably, the flame cutting system consists of a main bus, a secondary bus, and a cutting gun device. The main bus is used for gas supply to different workshops in the entire factory area. Each workshop has a secondary bus, which connects cutting guns at different workstations in the workshop.

[0020] Preferably, in step four, the central control system is coupled with the weather forecast system to adjust the ratio of the gas storage capacity of the primary gas tank to other gas consumption; the central control system automatically determines the gas demand of the factory through big data.

[0021] (III) Beneficial effects

[0022] The present invention provides a method for coupling green hydrogen "production and storage" and hydrogen-blended natural gas flame cutting.

[0023] It has the following beneficial effects:

[0024] 1. The novel flame cutting device using hydrogen-blended natural gas as fuel has higher cutting efficiency, precision and stability, and plays an important role in reducing energy consumption and material waste.

[0025] 2. The present invention uses green electricity to produce hydrogen, which is used as the main fuel component of the hydrogen-blended natural gas cutting device. At the same time, the energy storage system is networked with the real-time weather forecast for coordinated intelligent control, which can effectively utilize new energy, optimize production capacity and gas storage efficiency, and promote the development and application of clean energy technology.

[0026] 3. The present invention intelligently adjusts the gas supply from the energy storage system to the bus at each point according to the different gas consumption at different locations of the terminal, thereby realizing a high degree of energy conservation and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the method flow of the present invention; wherein, area ① represents the ALK hydrogen production system, area ② represents the energy storage, gas storage and gas mixing system, and area ③ represents the flame cutting system. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0029] Example:

[0030] like Figure 1 As shown, the embodiment of the present invention provides a method for coupling green hydrogen "production and storage" and hydrogen-blended natural gas flame cutting, which is implemented by the cooperation of ALK hydrogen production system, energy storage and gas blending system, flame cutting system, and central control system, including the following steps:

[0031] Step 1: The ALK hydrogen production system mainly uses water electrolysis hydrogen production technology. Specifically, it includes photovoltaic power generation and storage system, pure water device, electrolyzer, gas-liquid separation system, oxygen / hydrogen purification system, cooling and drying system, compressor, heat exchanger, alkali tank and oxygen / hydrogen storage tank.

[0032] The ALK hydrogen production system is powered by renewable energy. The power supply end of the electrolyzer is electrically connected to the photovoltaic module and the supplementary power unit of the photovoltaic power generation and storage system, the gas outlet of the electrolyzer is connected and fixed to the inlet of the gas-liquid separation system, the gas outlet of the gas-liquid separation system is connected and fixed to the gas inlet of the oxygen / hydrogen purification system, the gas outlet of the oxygen / hydrogen purification system is connected and fixed to the gas inlet of the cooling and drying system, and the cooling and drying system is connected and fixed to the inlet of the oxygen / hydrogen storage tank through a compressor.

[0033] As mentioned above, the gas electrolyzed by the electrolytic cell and containing a large amount of alkali liquid is first separated from the alkali liquid by a gas-liquid separation system, and then further washed by a purification system to remove a small amount of misty alkali liquid and water vapor contained in the gas to obtain pure gas, which is then passed through a cooler and a dryer, compressed by a compressor, and stored in a gas storage tank.

[0034] Secondly, the alkali solution required by the electrolytic cell is supplemented by an alkali adding tank equipped with an alkali preparation device (alkali preparation pump). A large amount of water is consumed during the electrolysis process. It is supplemented into the system by a pure water device and sent to the oxygen / hydrogen purification system through a water supply pump. The pure water enters the washing device of the oxygen / hydrogen purification system from the bottom to replenish the water lost by the system due to electrolysis. Therefore, the installation position of the oxygen / hydrogen purification system (purification device) should be higher than the gas-liquid separation system to ensure that the internal liquid can flow into the gas-liquid separation system. Similarly, the installation position of the gas-liquid separation system should also be higher than the electrolytic cell to ensure that the gas generated by the electrolytic cell rises to the gas-liquid separation system, and the separated alkali solution enters the heat exchanger from the lower outlet to ensure that the alkali solution entering the electrolytic cell is within a certain temperature range. At the same time, solid impurities may be generated in the alkali solution during the production process, so a filter is used in the system to remove the impurities. Finally, the alkali solution after heat exchange and filtration is re-input into the electrolytic cell through the alkali preparation pump for recycling.

[0035] Secondly, the overall cooling of the system is provided by the cooling water tank of the external cooling tower, which is transported to each system for circulating cooling through a cooling pump, and finally returns to the water tank after heat dissipation and cooling through a heat exchanger. Part of the waste heat is reused to supply domestic hot water.

[0036] Step 2: The energy storage, gas storage and gas blending system integrates the regulation and control of hydrogen and natural gas through flow meters, pressure gauges and valves to determine their ratio and transport them into the flame cutting system. Specifically, the energy storage, gas storage and gas blending system is mainly composed of the booster devices corresponding to the two gases (hydrogen and oxygen), oxygen / hydrogen gas storage tanks, secondary gas storage tanks, etc. Each pipeline is connected with flow meters, pressure gauges and valves to measure and monitor the pressure and flow, and to coordinate the mixing process.

[0037] The oxygen produced from the ALK hydrogen production system is pressurized by a booster pump and filled into an oxygen storage tank. The oxygen storage tank is connected to a secondary storage tank and is also connected to other gas supply channels to operate when the storage tank is full or has other uses.

[0038] Similarly, the hydrogen produced from the ALK hydrogen production system is pressurized by a booster pump and filled into a hydrogen storage tank. The hydrogen storage tank and the external natural gas tank are connected to the primary mixed gas tank together, and the mixed gas is filled according to the proportion. It is also connected to other external gas channels to operate when the gas tank is full or has other uses. In order to prevent gas backflow, a one-way check valve must be connected between the hydrogen storage tank, the mixed gas tank, the natural gas tank, and the mixed gas tank. Finally, the mixing ratio of hydrogen and natural gas in the mixed gas tank is integrated and controlled by flow meters, pressure gauges, and valves to determine its ratio. The outlet of the mixed gas tank is connected to the secondary mixed gas tank. Oxygen and the secondary mixed gas tank are controlled by ball valves, pressure reducing valves, and check valves and transported into the flame cutting system.

[0039] Step 3: The flame cutting system performs cutting work through a cutting gun. Specifically, the flame cutting system design is provided by the upper system with the fuel gas and oxygen required for cutting, and is composed of a main bus, a secondary bus, and a cutting gun device. Among them, the main bus is used for gas use in different workshops throughout the factory; each workshop has a secondary bus, which connects the cutting guns at different workstations in the workshop.

[0040] Step 4: The central control system is used to control the operation of the ALK hydrogen production system, energy storage and gas mixing system, and flame cutting system, and to control, adjust, and predict. Specifically, because the power source of the ALK hydrogen production system is mainly photovoltaic power generation, and an external power unit can be connected for power supplement. The power situation of the photovoltaic power generation system is greatly affected by the weather, so the central control system needs to be coupled with the weather forecast system to adjust the ratio of the gas storage capacity of the primary gas tank to other gas consumption, and to ensure that the gas storage capacity of the primary gas tank can meet the gas consumption of the factory area under continuous rainy days.

[0041] The secondary bus supplies gas to different plants. The central control system automatically determines the gas demand of the plant through big data, or the estimated gas consumption of the plant can be set manually in advance. The central control system allocates gas in advance through the secondary bus according to the predicted gas consumption of the plant.

[0042] This system is also connected to and accepts the deployment and control of the terminal computer in the energy storage system. According to the different gas consumption at different terminal locations, the gas supply module of the system will automatically adjust the gas supply from the valve group bus to each terminal location, thereby optimizing the gas supply network pressure to the greatest extent and saving energy.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for coupling green hydrogen "production and storage" and hydrogen-blended natural gas flame cutting, which is achieved through the coordination of ALK hydrogen production system, energy storage and gas blending system, flame cutting system, and central control system, and is characterized by: The following steps are involved: Step 1: The ALK hydrogen production system mainly uses water electrolysis hydrogen production technology. Specifically, the gas electrolyzed by the electrolyzer and containing a large amount of alkali liquid is first separated from the alkali liquid by a gas-liquid separation system, and then further washed by a purification system to obtain a small amount of mist alkali liquid and water vapor contained in the gas to obtain pure gas, which is then passed through a cooler and dryer, compressed by a compressor and stored in a gas storage tank; Step 2: The energy storage and gas mixing system integrates the regulation and control of hydrogen and natural gas through flow meters, pressure gauges and valves, determines their ratio, and transports them into the flame cutting system; Step 3: The flame cutting system performs cutting work through a cutting gun; Step 4: The central control system is used to control the operation of the ALK hydrogen production system, energy storage and gas mixing system, and flame cutting system, and to control, adjust and predict.

2. A method for coupling green hydrogen "for production and storage" and hydrogen-blended natural gas flame cutting according to claim 1, characterized in that: In step one, the ALK hydrogen production system includes a distributed photovoltaic power supply system power generation and storage system on the top of the plant, a pure water device, an electrolyzer, a gas-liquid separation system, an oxygen / hydrogen purification system, a cooling and drying system, a compressor, a heat exchanger, an alkali adding tank and an oxygen / hydrogen storage tank.

3. A method for coupling green hydrogen "for production and storage" and hydrogen-blended natural gas flame cutting according to claim 2, characterized in that: The power supply end of the electrolyzer is electrically connected to the photovoltaic module and the supplementary power unit of the photovoltaic power generation and storage system respectively; the gas outlet of the electrolyzer is connected and fixed to the inlet of the gas-liquid separation system; the gas outlet of the gas-liquid separation system is connected and fixed to the gas inlet of the oxygen / hydrogen purification system; the gas outlet of the oxygen / hydrogen purification system is connected and fixed to the gas inlet of the cooling and drying system; the cooling and drying system is connected and fixed to the inlet of the oxygen / hydrogen storage tank through a compressor.

4. A method for coupling green hydrogen "for production and storage" and hydrogen-blended natural gas flame cutting according to claim 3, characterized in that: The alkali solution required by the electrolytic cell is supplemented by an alkali adding tank equipped with a set of alkali preparation devices; during the electrolysis process of the electrolytic cell, water is supplemented into the system by a pure water device; the alkali solution separated by the gas-liquid separation system enters the heat exchanger and filter from the lower outlet, and the alkali solution after heat exchange and filtration is re-input into the electrolytic cell for recycling.

5. A method for coupling green hydrogen "for production and storage" and hydrogen-blended natural gas flame cutting according to claim 4, characterized in that: In step 2, the energy storage, gas storage and gas mixing system is mainly composed of booster pumps corresponding to the two gases, oxygen / hydrogen gas storage tanks, and secondary gas storage tanks. Each pipeline is connected to a flow meter, a pressure gauge and a valve to measure and monitor the pressure and flow rate and to coordinate the mixing process.

6. A method for coupling green hydrogen "for production and storage" and hydrogen-blended natural gas flame cutting according to claim 5, characterized in that: The oxygen produced by the ALK hydrogen production system is pressurized by a booster pump and filled into an oxygen storage tank. The oxygen storage tank is connected to a secondary storage tank and is also connected to other gas passages so that operations can be performed when the storage tank is full or has other uses.

7. A method for coupling green hydrogen "for production and storage" and hydrogen-blended natural gas flame cutting according to claim 6, characterized in that: The hydrogen produced by the ALK hydrogen production system is pressurized by a booster pump and filled into a hydrogen storage tank. The hydrogen storage tank and the external natural gas tank are connected to a primary mixing gas tank, and the mixed gas is filled according to the proportion. Other external gas passages are also connected to operate when the gas tank is full or has other uses.

8. A method for coupling green hydrogen "for production and storage" and hydrogen-blended natural gas flame cutting according to claim 7, characterized in that: In step three, the flame cutting system consists of a main bus, a secondary bus, and a cutting gun device. The main bus is used for gas supply to different workshops in the entire factory area. Each workshop has a secondary bus, which connects cutting guns at different workstations in the workshop.

9. A method for coupling green hydrogen "for production and storage" and hydrogen-blended natural gas flame cutting according to claim 8, characterized in that: In step 4, the central control system is coupled with the weather forecast system to adjust the ratio of the gas storage capacity of the primary gas tank to other gas consumption; the central control system automatically determines the gas demand of the factory through big data.

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