CN112921343B - Cold and hot hydrogen combined supply system and control method - Google Patents
Cold and hot hydrogen combined supply system and control method Download PDFInfo
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- CN112921343B CN112921343B CN202110193893.6A CN202110193893A CN112921343B CN 112921343 B CN112921343 B CN 112921343B CN 202110193893 A CN202110193893 A CN 202110193893A CN 112921343 B CN112921343 B CN 112921343B
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/02—Process control or regulation
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B15/00—Operating or servicing cells
- C25B15/08—Supplying or removing reactants or electrolytes; Regeneration of electrolytes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The invention discloses a combined cooling heating and hydrogen supply system and a control method thereof. The invention adopts the water electrolysis method to produce hydrogen, and simultaneously makes full use of the heat produced by hydrogen production in the electrolytic cell for heat supply and cold supply. The heat absorption refrigerator is used to convert high temperature water into low temperature water for cooling. The controller controls the working states of the electrolysis cell and the cold machine according to the requirements of cold, heat and hydrogen, thereby realizing the optimization of efficiency. The invention can realize the high-efficiency utilization of energy and has better economic value.
Description
Technical Field
The invention relates to a cold-hot hydrogen combined supply system and a control method, in particular to the field of hydrogen production by water electrolysis.
Background
The hydrogen energy belongs to secondary energy, and has the main advantages that: the combustion heat value is high, the combustion product is water, and the energy is the cleanest energy in the world. Therefore, the hydrogen energy is one of the main paths for global energy transformation to sustainable development, is the frontier field of the whole energy technology, is an important carrier for supporting the scale development of renewable energy sources and constructing a comprehensive energy supply system mainly based on the renewable energy sources, and has very wide application prospect.
The advantages of the development of the hydrogen energy industry are obvious, and the hydrogen energy has wide development space. The hydrogen industry in China has a good foundation, but hydrogen is mainly prepared from fossil energy at present and is reformed into hydrogen, and the raw materials are coal, petroleum and natural gas, so that the hydrogen is not a real clean energy. In the face of problems of environmental pollution, carbon emission and the like, transformation of an energy structure is urgently needed; the characteristics of the renewable energy source such as intermittence and volatility cause a great amount of wind and light abandonment. The effective method for solving the problem is to combine the electric power of renewable energy sources with the water electrolysis technology to prepare high-purity hydrogen, and the hydrogen production by water electrolysis of renewable energy sources will become the mainstream in the future. In addition, the market potential for hydrogen energy consumption is huge, and fuel cell vehicles are just rising and will keep growing rapidly in the future.
At present, the hydrogen production efficiency by electrolyzing water is about 70 percent, about 30 percent of energy is lost in a heat form, and if the part of heat energy can be fully utilized, the energy utilization efficiency can be greatly improved.
Disclosure of Invention
The invention aims to overcome the problem of low utilization efficiency of the existing electrolytic water hydrogen production energy source, and provides a cold-hot hydrogen combined supply system and a control method.
The invention relates to a cold-hot hydrogen combined supply system and a control method thereof.
The water electrolysis hydrogen production unit consists of an isolation transformer, a hydrogen production converter, an electrolytic bath, a hydrogen purification device, a water circulation device and a hydrogen monitoring device.
The heat exchange heat storage tank comprises a heat exchange tube, 1 water outlet and 2 water inlets are reserved in the tank body, and a heat insulation material is wrapped outside the tank body; the high-temperature water output by the water electrolysis hydrogen production unit flows into the heat exchange pipe, transfers the heat to the medium in the cooling tank, and flows back to the hydrogen production unit after being cooled, thereby realizing the function of cooling the temperature of the electrolytic tank.
The inlet of the circulating water pump is connected to the water outlet of the heat exchange and storage tank through a water pipe, the outlet of the circulating water pump is connected to the inlet of the electric heating module through a water port, the circulating water pump has the function of realizing external circulation of water in the heat exchange and storage tank, the start and stop of the circulating water pump are controlled by a control system, and the first proportional solenoid valve and the second proportional solenoid valve are controlled by the control system.
The heat absorption refrigerator consists of generator, condenser, evaporator, absorber, circulating pump, throttle valve and other parts, and the working medium includes cold producing refrigerant and absorbent for absorbing and desorbing the refrigerant to constitute working medium pair.
The control method disclosed by the invention is based on the requirements of cold, heat and hydrogen, adopts double closed loop negative feedback control of hot water flow and water temperature, namely adopts proportion (P) to control the opening degrees of a first proportional solenoid valve and a second proportional solenoid valve according to the requirements of cold and heat loads and actual temperature, and also adopts proportional-integral-derivative (PID) to control the starting and stopping of an electric heating module, so that the maximum utilization rate of energy is realized. .
According to the photovoltaic electrolyzed water hydrogen production system and the control method provided by the invention, through the structure and the effect, the characteristics of high efficiency, low cost and high power grade can be realized aiming at the direct electrolyzed water hydrogen production of photovoltaic power generation.
Drawings
FIG. 1 is a diagram of a combined cooling and heating hydrogen supply system
FIG. 2 is a flow chart of a control method of a combined cooling, heating and hydrogen supply system
FIG. 3 proportional solenoid valve control strategy
FIG. 4 electric heating module control strategy
Detailed Description
The invention is further described below with reference to the accompanying drawings and the detailed description.
The invention provides a cold, heat and hydrogen combined supply system and a control method thereof, wherein the cold, heat and hydrogen combined supply system mainly comprises an electrolytic water hydrogen production unit 1, a heat exchange heat storage tank 2, a hydrogen storage tank 3, a circulating water pump 4, an electric heating module 5, a first proportional electromagnetic valve 6, a second proportional electromagnetic valve 7, a heat absorption type refrigerator 8 and a control system 9.
In the cold, heat and hydrogen combined supply system, a power grid supplies power 1 to the water electrolysis hydrogen production unit, and an external water supply system supplies water for the water electrolysis hydrogen production unit 1; the water electrolysis hydrogen production unit 1 realizes water electrolysis to generate hydrogen and oxygen, wherein the oxygen is discharged into the air, and a hydrogen output pipe is connected with the hydrogen storage tank 3 to store the generated hydrogen into the hydrogen storage tank 3. The heat generated by the electrolyzed water hydrogen production unit 1 is brought out by the internal cooling circulation system, the outlet and the inlet of the internal cooling circulation system are respectively connected with the inlet and the outlet of the heat exchange heat storage tank 2, and the heat generated by the electrolyzed water hydrogen production unit 1 is released into the medium water in the heat exchange heat storage tank 2.
The water outlet of the heat exchange and storage tank 2 is connected with the water inlet of a circulating water pump 4, the circulating water pump 4 pumps water into an electric heating module 5, if the water temperature is too low, it is heated by the electric heating module 5 and sent to the heat load and absorption refrigerator 8. The heat absorption type refrigerator 8 can realize the conversion from heat energy to cold energy and supply cold water to a cold load; the return water returns to the heat exchange and storage tank 2 through the heat load and the heat absorption refrigerator 8 respectively, and the water circulation of cold supply and heat supply is completed.
The control system 9 is used as a master control mechanism for controlling the working state of the electrolyzed water hydrogen production unit 1, and the control mode is realized through Can communication. Meanwhile, the control system 9 monitors the temperature of the medium in the heat exchange and storage tank 2, the temperature of the medium in the electric heating module 5 and the temperature of inlet and outlet water of cold/heat loads. The control system 9 also controls the on and off of the first proportional solenoid valve 6 and the second proportional solenoid valve 7. Besides the control function, the control system 9 also realizes the safety state monitoring function, monitors the pressure of the hydrogen storage tank 3, and monitors the hydrogen leakage of the environment. The internal control components of the control system 9 adopt a general PLC.
The flow chart of the control method of the combined cooling heating and hydrogen system is shown in FIG. 2. Firstly, a control system executes a signal acquisition module S901, then executes a starting condition judgment module S902, and if the system has a fault or a stopping instruction, enters a stopping protection module S903; if the system has no fault and has a starting instruction, the water electrolysis hydrogen production module S904 is continuously started; after the water electrolysis hydrogen production module S904 is started, the water electrolysis hydrogen production module enters a refrigerating or heating requirement judging module S905, if refrigerating or heating requirements do not exist, the program is directly jumped to a program ending position, and if refrigerating or heating requirements exist, the water circulation pump module S906 is started and the water electrolysis hydrogen production module S907 enters a refrigerating and heating control algorithm module.
The signal acquisition module S901 acquires the temperature of an electrolytic cell, the pressure of a hydrogen storage tank, the temperature of a medium in the heat exchange heat storage tank, the temperature of an electric heating module and the state information of a hydrogen production unit; the starting condition judgment module S902 monitors whether the system has faults or not and a starting and stopping instruction in real time; the shutdown protection module S903 gives a shutdown instruction to the electrolyzed water hydrogen production module, and simultaneously stops refrigeration and heating control; the water electrolysis hydrogen production module S904 is started, and mainly has the functions of sending a starting instruction to the water electrolysis hydrogen production module and starting a cooling water circulation system of the water electrolysis hydrogen production unit; the refrigerating or heating demand judging module S905 judges according to an external demand instruction; the start circulating water pump module S906 executes a start water pump command.
The cooling and heating control algorithm module S907 includes a proportional solenoid valve control strategy and an electric heating module control strategy, and the proportional solenoid valve control strategy is shown in fig. 3. The difference between the actual temperature of the cooling load and the required temperature of the cooling load enters a first proportional regulator S9001, the function of the first proportional regulator is to multiply the input by a proportional coefficient to serve as output and output the output to a first amplitude limiting regulator S9003, the amplitude limiting proportional regulator limits the input to the maximum value and the minimum value and then outputs a signal, and the output signal of the amplitude limiting proportional regulator serves as the given value of the opening degree of a second proportional solenoid valve 7. The difference between the heat load demand temperature and the actual temperature of the heat load enters a second proportional regulator S9002, the function of the second proportional regulator is to multiply the input by a proportional coefficient to be used as output and output the output to a second amplitude limiting regulator S9004, the amplitude limiting proportional regulator limits the input to the maximum value and the minimum value and then outputs a signal, and the output signal of the amplitude limiting proportional regulator is used as the given value of the opening degree of the first proportional solenoid valve 6.
Fig. 4 shows an electric heating module control strategy, in which a difference is made between a heat load required temperature and a heat load actual temperature, and the difference is input to a first PID controller 9005, the first PID controller 9005 is configured to perform PID operation on the input, output an operation result, and output the operation result to a third amplitude limiting module S9007, and the third amplitude limiting module S9007 is configured to perform amplitude limiting on an input value; the difference between the actual temperature of the cold load and the required temperature of the cold load is input into a second PID controller 9006, the second PID controller 9006 has the functions of carrying out proportional integral derivative PID operation on the input, outputting the operation result, and outputting the result to a fourth amplitude limiting module S9008, and the fourth amplitude limiting module S9008 has the function of limiting the input value; the outputs of the third limiting module S9007 and the fourth limiting module S9008 enter a maximum module S9009, the maximum module S9009 has the function of solving the maximum value of 2 input values and then outputting the maximum value to a heating start-stop judging module S9010, the heating start-stop judging module S9010 compares the input values with preset values, and when the input values are smaller than or equal to the preset values, a heating module starting control instruction is sent.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the present invention shall be covered thereby. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (3)
1. A combined cooling heating and hydrogen supply system comprises an electrolyzed water hydrogen production unit, a heat exchange heat storage tank, a hydrogen storage tank, a circulating water pump, an electric heating module, a first proportional electromagnetic valve, a second proportional electromagnetic valve, a heat absorption type refrigerating machine, a heat load, a cooling load and a control system;
the water electrolysis hydrogen production unit consists of an isolation transformer, a hydrogen production converter, an electrolytic tank, a hydrogen purification device, a water circulation device and a hydrogen monitoring device;
the heat exchange heat storage tank is internally provided with heat exchange tubes, 1 water outlet and 2 water inlets are reserved in the tank body, and the tank body is wrapped by a heat insulation material; the high-temperature water output by the water electrolysis hydrogen production unit flows into the heat exchange pipe, transfers heat to the medium water in the heat exchange heat storage tank, and flows back to the hydrogen production unit after being cooled, so that the function of cooling the temperature of the electrolytic bath is realized; the water outlet of the heat exchange heat storage tank is connected to the water inlet of a water circulating pump, the water circulating pump pumps water into the electric heating module, and if the water temperature is too low, the water is heated by the electric heating module and is sent to the heat load and heat absorption type refrigerating machine; the heat absorption type refrigerating machine can realize the conversion from heat energy to cold energy and supply cold water to a cold load; the return water of the heat load and the heat absorption type refrigerating machine returns to the heat exchange heat storage tank through the heat load and the heat absorption type refrigerating machine respectively to complete water circulation of cold supply and heat supply;
the control system adopts double closed loop negative feedback control of hot water flow and water temperature based on the requirements of cold, heat and hydrogen, namely, the opening degrees of the first proportional solenoid valve and the second proportional solenoid valve are controlled in proportion according to the requirements of cold and heat loads and actual temperature, and meanwhile, the starting and stopping of the electric heating module are controlled by adopting proportional integral derivative, so that the maximum utilization rate of energy is realized.
2. A combined cooling, heating and hydrogen supplying system according to claim 1, wherein the inlet of the circulating water pump is connected to the water outlet of the heat exchange and heat storage tank through a water pipe, the outlet of the circulating water pump is connected to the inlet of the electric heating module through a water pipe, the function of the circulating water pump is to realize external circulation of water in the heat exchange and heat storage tank, and the start and stop of the circulating water pump are controlled by the control system.
3. A combined cooling and heating and hydrogen supplying system according to claim 1, wherein the opening degree of the first proportional solenoid valve and the opening degree of the second proportional solenoid valve are controlled by a control system.
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| CN113818046B (en) * | 2021-09-17 | 2024-01-26 | 中国华能集团清洁能源技术研究院有限公司 | Heat integration method and system for dynamic hydrogen production process |
| CN114808029B (en) * | 2022-04-14 | 2023-09-01 | 华中科技大学 | Thermal management adjusting system for alkaline water electrolysis hydrogen production and adjusting method thereof |
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