Coal slurry electrolytic hydrogen production system and method based on solar power supply and heat supply

Abstract

The invention discloses a coal slurry electrolysis hydrogen production system and method based on solar power supply and heat supply, and the system comprises a photovoltaic power supply and heat supply unit which is used for converting solar energy into electric energy and heat energy, and the electric energy is provided for the electrolysis process of coal slurry after being subjected to power supply adjustment and pulse modulation through a power supply controller and a pulse controller; the heat energy is used for heating coal slurry in the electrolysis process through the heat exchanger and is supplied to the electrolytic reaction unit through the circulating pump; the coal slurry preparation unit is used for crushing and screening low-rank coal and mixing the low-rank coal with a dispersing agent, dilute acid or dilute alkali to prepare coal slurry; the electrolytic reaction unit is used for electrolyzing the coal slurry, so that the coal slurry is subjected to an oxidation-reduction reaction under the action of an electric field to obtain hydrogen; the intelligent control unit is used for adjusting operation parameters of the coal slurry electrolytic hydrogen production system; according to the coal slurry electrolytic hydrogen production system, the electrolyte can be preheated through cooperation of photovoltaic waste heat, the overall efficiency and stability of the system are improved, the resource utilization rate is increased, and clean and efficient conversion of low-rank coal resources is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal-based resource conversion and hydrogen energy utilization, and particularly relates to a coal slurry electrolysis hydrogen production system and method based on solar power supply and heat supply. BACKGROUND

[0002] As a clean energy carrier with zero carbon emissions, high heat value and abundant sources, hydrogen energy is gradually becoming a key component of the energy system. Among them, coal-based hydrogen production is still one of the main sources of hydrogen supply at present, especially the by-product resources such as low-rank coal and coal slurry have important utilization value due to their abundant reserves and low price. However, the traditional coal gasification hydrogen production route has problems such as complex process flow, high energy consumption, large amount of oxygen required, high temperature and high pressure conditions, heavy carbon emissions, and large water resource consumption, which restricts its sustainable development in the clean energy system.

[0003] In the prior art, attempts have been made to apply electrolysis to coal slurry systems, using electrochemical methods to oxidize carbonaceous components in coal slurry, thereby replacing anode oxygen evolution reaction and reducing reaction potential to achieve low-energy hydrogen production. However, most of the currently disclosed technologies are still based on constant working conditions and continuous power supply conditions, and do not consider the influence of the unstable characteristics of renewable energy power supply on the reaction behavior of the system. The overall coupling of the system is poor and the adaptability is weak. In addition, the electrolysis coal slurry system generally has high viscosity, low mass transfer efficiency, and slow initial reaction rate. The existing system has low efficiency and high energy consumption during the normal temperature startup stage, and especially when the light intensity is low or the current density is insufficient, the electrolysis reaction is difficult to maintain effective progress. Therefore, the existing coal-based electrolysis hydrogen production system generally has the following defects: it is difficult to adapt to the intermittent power supply of fluctuating renewable energy such as solar energy; it lacks a dynamic temperature regulation mechanism for the reaction liquid, has low startup efficiency and low system energy efficiency; and it fails to achieve coordinated use of photovoltaic electricity and heat, resulting in low overall energy utilization rate. SUMMARY

[0004] In view of the problems existing in the prior art, the present application provides a coal slurry electrolysis hydrogen production system and method based on solar power supply and heat supply, which can realize a coal slurry electrolysis hydrogen production system that cooperatively preheats electrolyte liquid with photovoltaic waste heat to improve the overall efficiency, stability and resource utilization rate of the system, and achieve clean and efficient conversion of low-rank coal resources.

[0005] The technical solution of the present application is as follows: In a first aspect of the present application, a coal slurry electrolysis hydrogen production system based on solar power supply and heat supply is provided, comprising: A photovoltaic power supply and heat supply unit is used to convert solar energy into electrical energy and heat energy. The electrical energy is provided to the electrolysis tank for the electrolysis process of the coal slurry after power adjustment and pulse modulation by a power supply controller and a pulse controller. The heat energy is heated by a heat exchanger for the coal slurry in the electrolysis process and is provided to the electrolysis reaction unit by a circulating pump. The coal slurry preparation unit is used for crushing, screening and mixing low-rank coal with dispersing agent, dilute acid or dilute alkali to prepare coal slurry, and the coal slurry is delivered to the preheating module; The electrolysis reaction unit is used for electrolyzing the coal slurry in the electrolytic cell by using the electric energy provided by the photovoltaic power supply and heating unit, so that the coal slurry is subjected to oxidation-reduction reaction under the action of the electric field to obtain hydrogen. The intelligent control unit is used for adjusting the operation parameters of the coal slurry electrolysis hydrogen production system, and the operation parameters include current set value, voltage set value, stirring speed and pulse modulation parameters.

[0006] In some embodiments of the present application, the photovoltaic power supply and heating unit comprises a solar cell panel, the front surface of the solar cell panel is used for photoelectric conversion, the back surface is attached to a heat exchange component, the heat exchange component adopts a heat exchange substrate and a coil structure, and is used for collecting waste heat generated during the operation of the solar cell panel.

[0007] In some embodiments of the present application, the coil structure is connected with a heat exchanger, the heat exchanger is further connected with a coal slurry storage tank, and the coal slurry in the coal slurry storage tank is preheated by the heat exchanger and then delivered to the electrolytic cell of the electrolysis reaction unit by a circulating pump.

[0008] In some embodiments of the present application, the pulse controller applies a rectangular pulse signal to the electric energy converted by the solar energy, and provides pulse current to the electrolysis reaction unit.

[0009] In some embodiments of the present application, the coal slurry preparation unit comprises a stirring and mixing device, and the stirring and mixing device is connected with the coal slurry storage tank through a slurry delivery pump.

[0010] In some embodiments of the present application, the electrolysis reaction unit comprises an electrolytic cell, a cathode and an anode are arranged in the electrolytic cell, and a cation exchange membrane is arranged between the cathode and the anode.

[0011] In some embodiments of the present application, a gas separation and purification unit is further included, and the gas separation and purification unit comprises a condenser, a primary water removal device and a packed adsorption tower connected in sequence.

[0012] In some embodiments of the present application, the intelligent control unit comprises a data acquisition module and an embedded controller connected with each other; the data acquisition module comprises an illumination sensor and a current-voltage collector installed on the photovoltaic power supply and heating unit, and an electrolyte temperature sensor installed on the electrolysis reaction unit; and the embedded controller is built-in with a GA-BP neural network model.

[0013] In the second aspect of the present application, a coal slurry electrolysis hydrogen production method based on solar power supply and heating is provided, comprising the following steps: The photovoltaic power supply heating unit converts solar energy into electric energy and heat energy, the electric energy is provided to the electrolytic cell after voltage stabilization and pulse modulation to supply the electrolysis process of the coal slurry, and the heat energy preheats the coal slurry in the electrolysis process and is provided to the electrolysis reaction unit through the circulating pump; The low-rank coal is crushed and screened, and the low-rank coal is mixed with a dispersing agent, dilute acid or dilute alkali to prepare a coal slurry, and the coal slurry is transported to the preheating unit and preheated through a heat exchanger. The coal slurry is electrolyzed by using the electric energy provided by the photovoltaic power supply heating unit, so that the coal slurry is subjected to an oxidation-reduction reaction under the action of an electric field to obtain hydrogen, and the intelligent control unit is used to optimize the operating parameters in real time.

[0014] In some embodiments of the present application, the intelligent control unit optimizes the operating parameters in real time, specifically including: Real-time acquisition of voltage, current, electrolyte temperature and light intensity of the system; The above data is input into the GA-BP neural network model of the intelligent control unit, and the output current setting value, stirring speed and pulse modulation parameters are output; The power supply controller, pulse controller and circulating pump are adjusted according to the output operating parameters.

[0015] The one or more technical solutions of the present application have the following beneficial effects: (1) The system of the present application provides electric energy and heat through the electrolysis process of the electrolysis reaction unit of the photovoltaic power supply heating unit, which can efficiently adapt to the intermittent and fluctuating characteristics of solar photovoltaic power supply, and through the intelligent control unit, the electrolysis reaction continuity under external disturbance conditions such as solar radiation changes and cloud cover is realized. Compared with the existing electrolysis system which relies on stable power supply, the present system does not need to be connected to a large power grid or industrial power supply, and can still operate stably in distributed, remote or micro-grid scenarios, greatly expanding its application space.

[0016] (2) The system of the present application fully recovers and utilizes the waste heat in the photovoltaic power generation process, and preheats the electrolyte. The traditional coal slurry electrolysis system generally has low initial temperature, limited mass transfer and electrode reaction hysteresis, especially in non-constant temperature and heterogeneous environments. The present application conducts the heat of the unconverted solar energy on the back of the photovoltaic panel to the electrolyte through the preheating unit, so that the starting temperature of the reaction system is maintained at 60-80℃, the electrochemical oxidation rate of the carbonaceous component is significantly accelerated, the hydrogen production rate per unit time is improved, and the electrode polarization phenomenon is effectively delayed, prolonging the stable operation time of the system.

[0017] (3) This invention constructs an intelligent control unit, realizing dynamic control of multiple parameters such as coal slurry concentration, electrolyte temperature, and current density. By integrating an artificial neural network based on the GA-BP model, it performs rapid calculations after acquiring electrochemical response characteristic data and outputs optimization strategies in real time, enabling the system to maintain its optimal operating range even under conditions such as changes in light intensity and fluctuations in electrolysis load. This autonomous learning and feedback control mechanism significantly improves the overall energy efficiency and hydrogen quality stability of the system.

[0018] (4) This invention uses coal slurry as the electrolysis raw material, which not only avoids the high energy consumption and scarce water resource consumption problems in the pure water electrolysis process, but also realizes the resource utilization of by-products in the coal sorting process. The carbonaceous components in the coal slurry replace the traditional anode oxygen evolution reaction, effectively reducing the reaction overpotential. The total electrolysis voltage of the system can be reduced by 0.4–0.6V, and the energy consumption can be reduced by more than 15%, providing a new path for achieving low-carbon, low-cost green hydrogen. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the coal slurry electrolysis hydrogen production system based on solar power and heating according to the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example 1 In a typical embodiment of the present invention, a coal slurry electrolysis hydrogen production system based on solar power and heating is proposed, comprising: The photovoltaic power supply and heating unit is used to convert solar energy into electrical energy and heat energy. The electrical energy is supplied to the electrolytic cell for the electrolysis process of coal slurry after power regulation and pulse modulation by the power controller and pulse controller. The heat energy is heated by the heat exchanger for the coal slurry in the electrolysis process and supplied to the electrolysis reaction unit by the circulating pump. The coal slurry preparation unit is used to crush and screen low-rank coal, and mix the low-rank coal with dispersant, dilute acid or dilute alkali to prepare coal slurry, which is then transported to the preheating module. The electrolysis reaction unit uses the electrical energy provided by the photovoltaic power supply and heating unit to electrolyze the coal slurry in the electrolytic cell, so that the coal slurry undergoes an oxidation-reduction reaction under the action of an electric field to produce hydrogen. The intelligent control unit is used to adjust the operating parameters of the coal slurry electrolysis hydrogen production system, including current setpoint, voltage setpoint, stirring speed, and pulse modulation parameters.

[0022] In the embodiment, the photovoltaic power supply heating unit comprises a solar panel, the front surface of the solar panel is used for photoelectric conversion, and the back surface is attached to a heat exchange assembly. The heat exchange assembly adopts a heat exchange base plate and a coil structure, and is used for collecting waste heat generated during operation of the solar panel.

[0023] Specifically, the current output end of the solar panel is connected with a current collection box, the output end of the current collection box is connected with an inverter rectifier, the direct current output by each group of solar panels is integrated through the current collection box and then rectified through the inverter rectifier, the output end of the inverter rectifier is connected with a power supply controller and an energy storage battery respectively, the output end of the power supply controller is connected with a pulse controller, the output end of the pulse controller is connected with the electrode plate in the electrolytic cell, the rectified power supply is adjusted by the power supply controller, and a rectangular pulse signal is applied by the pulse controller, so that the electrode plate of the electrolytic cell provides pulse current to realize electrolysis.

[0024] It can be understood that the pulse electric field generated by providing the pulse current to the electrolytic cell can periodically change the local electric field intensity on the electrode surface, break the stability of the electrolyte boundary layer, promote fluid disturbance, and thus enhance mass transfer. At the same time, the high-frequency switching of the pulse voltage is beneficial to the rapid detachment of bubbles, avoids the shielding of the electrode surface by bubbles, and effectively improves the electrode reaction efficiency and hydrogen production rate. The frequency of the pulse current is controlled at 30-60 Hz, and the duty cycle is controlled at 40-70%.

[0025] The power supply controller and the pulse controller are electrically connected with an intelligent control unit. The power supply controller and the pulse controller receive signals from the intelligent control module, adjust the output current density, the charging and discharging state, and the pulse modulation parameters according to the real-time running state, so as to adapt to the continuous electrolysis demand under the intermittent power supply condition.

[0026] The energy storage battery in the embodiment can adopt a lithium battery pack, which is used to provide a compensation power supply when the light intensity is insufficient or the system load is suddenly changed, and maintain the stable operation of the electrolysis system.

[0027] In the embodiment, the heat exchange medium flows in the heat exchange coil, which is used to absorb heat from the heat exchange base plate. The heat-absorbed heat exchange medium enters a heat exchanger, which provides heat to the coal slurry electrolyte. Specifically, the heat exchanger is preferably a shell-and-tube structure, the heat exchange tube side is connected to hot water from the photovoltaic heat exchange assembly, and the shell side is connected to the coal slurry electrolyte, so as to realize heat exchange preheating of the coal slurry system. A circulating pump is used to drive the electrolyte to flow between the electrolyte storage tank, the electrolytic cell and the heat exchanger, so that the coal slurry is maintained at an appropriate reaction temperature interval of 60-80°C before entering the electrolytic cell, thereby effectively reducing the initial potential of the anode electrochemical reaction, improving the current efficiency and hydrogen production rate, and the temperature interval is significantly beneficial to improving the electrochemical activity of the carbonaceous components in the coal slurry system, shortening the system startup time, enhancing the initial mass transfer efficiency, and thus improving the hydrogen production rate under unit energy consumption.

[0028] In the embodiment, the coal slurry preparation unit comprises a stirring and mixing device connected to a coal slurry storage tank through a slurry delivery pump, and the outlet of the coal slurry storage tank is connected to a heat exchanger. The coal slurry in the coal slurry storage tank enters the heat exchanger for heating, and the heated coal slurry enters the electrolyte tank through a circulating pump.

[0029] Specifically, the coal powder storage tank is filled with dry coal powder with a particle size of ≤100 μm, which is continuously conveyed to the stirring and mixing device through a screw feeding mechanism. The stirring and mixing device is provided with stirring blades. Under the action of the stirring blades, the dry coal powder is mixed with a dispersing agent, dilute acid or dilute alkali to form a coal slurry. The solid-liquid mass ratio in the coal slurry is preferably 1:3. The slurry is fully mixed and heated by the heat exchanger and then sent to the electrolysis reaction unit by a circulating pump. The added dispersing agent is about 0.5% of the mass of the coal, which serves to form an electrolytic coal slurry with good suspension stability.

[0030] In the embodiment, the electrolysis reaction unit comprises an electrolysis tank, which is provided with a cathode and an anode, and a cation exchange membrane is arranged between the cathode and the anode.

[0031] Specifically, the electrolysis tank is a double-chamber structure made of corrosion-resistant material, and an ion exchange membrane is arranged in the middle of the tank body to separate the anode chamber and the cathode chamber. The anode is made of graphite rod or nickel-based material, which is used to catalyze the oxidation reaction of carbonaceous components in the coal slurry to release electrons and CO2 gas; the cathode is made of stainless steel mesh, which is used to reduce hydrogen gas. In the electrolysis reaction, the anode undergoes the following reaction: C(s) + 2H2O(l) → CO2(g) + 4H + + 4e - The cathode undergoes the following reaction: 4H + + 4e - → 2H2(g) Gas outlets are arranged on both sides of the electrolysis tank. The CO2 generated by the anode and the H2 generated by the cathode are respectively introduced into a gas separation and purification unit through pipelines. The gas separation and purification unit comprises a condenser, a primary water removal device, a packed adsorption tower, and a purified output interface. The condenser is used to remove water vapor; the primary water removal device removes liquid water droplets; the packed adsorption tower is sequentially filled with activated carbon and molecular sieves to remove impurities such as CO2 and H2S; and finally high-purity hydrogen gas is output. The working voltage of the electrolysis tank is 1.8-2.2 V, and the current density is 1.5-2.0 A / cm 2 .

[0032] In the embodiment, the intelligent control unit comprises a data acquisition module and an embedded controller connected with each other; the data acquisition module comprises an illumination sensor and a current-voltage collector installed on the photovoltaic power supply and heating unit, and an electrolyte temperature sensor installed on the electrolysis reaction unit; the embedded controller is built-in with a GA-BP neural network model.

[0033] The GA-BP neural network is a BP (back propagation) neural network with the genetic algorithm (GA) used to optimize the weight value and threshold value.

[0034] The number of input layer nodes: corresponding to the dimension of the actually collected multi-source data, including electrolytic cell voltage, current density, electrolyte temperature, illumination intensity, etc.

[0035] The number of output layer nodes: corresponding to the optimized control parameters, mainly including current set value, pulse electric field frequency and duty cycle, and circulating pump flow.

[0036] The hidden layer: three layers are adopted, and the number of nodes is automatically optimized by the genetic algorithm to ensure the prediction accuracy and convergence speed.

[0037] The input of the GA-BP neural network model is multi-dimensional data such as electrolytic cell voltage, current density, electrolyte temperature, and illumination intensity.

[0038] The output of the GA-BP neural network model is the optimal process control instruction, including current set value, voltage set value, pulse modulation parameter (frequency and duty cycle), and circulating pump flow.

[0039] Before the model is applied, experimental data is used for training. The training steps are as follows: The historical running data (electrolytic cell voltage, current density, electrolyte temperature, illumination intensity, etc.) are used as input samples; The current set value, voltage set value, pulse electric field frequency and duty cycle, and circulating pump flow under the optimal hydrogen production rate, energy consumption, and system stability measured by experiments are used as output samples; The initial weight value and threshold value of the BP network are optimized by GA to avoid local optimum; The nonlinear mapping relationship between the input and the output is obtained through iterative training.

[0040] The finally trained model can output the optimal running parameters under different illumination intensities and working conditions, realizing intelligent control of the system.

[0041] Embodiment 2 In a typical embodiment of the present application, a coal slurry electrolysis hydrogen production method based on solar power supply and heating is provided, comprising the following steps: The photovoltaic power supply and heating unit converts solar energy into electric energy and heat energy, the electric energy is provided to the electrolytic cell after voltage stabilization and pulse modulation to electrolyze the coal slurry, and the heat energy heats the coal slurry in the electrolysis process; The low-rank coal is crushed and screened, and the low-rank coal is mixed with a dispersing agent, dilute acid or dilute alkali to prepare a coal slurry, and the coal slurry is delivered to a preheating unit and preheated by a heat exchanger. The coal slurry is electrolyzed by using the electric energy provided by the photovoltaic power supply and heating unit, so that the coal slurry is subjected to an oxidation-reduction reaction under the action of an electric field to obtain hydrogen, and the intelligent control unit is used to optimize the operating parameters in real time.

[0042] Further, the real-time optimization of the operating parameters specifically includes: Real-time acquisition of voltage, current, electrolyte temperature and light intensity of the system; The above data is input into the GA-BP neural network model of the intelligent control unit, and the output current setting value, stirring speed and pulse modulation parameters are output; The output operating parameters are used to adjust the power supply controller, pulse controller and circulating pump, respectively.

[0043] The adjustment principle of the intelligent control unit is: 1. When the solar radiation intensity is strong and the power is sufficient: The system first detects the photovoltaic power and the real-time load demand of the electrolytic cell; The control module preferentially allocutes the photovoltaic electric energy to the electrolytic cell to maintain stable operation at the target current density; If there is excess electric energy, the system automatically switches to the energy storage battery charging channel to store the excess electric energy.

[0044] 2. When the irradiation is insufficient or at night: The system detects that the photovoltaic output power is insufficient to maintain the operation of the electrolytic cell in real time; The energy management module issues an instruction to enable the energy storage battery to discharge power; Ensure that the current density of the electrolysis process is not lower than the minimum threshold set by the intelligent optimization module.

[0045] 3. Current setting value adjustment: when the electrolytic cell voltage is lower than the set threshold (such as 1.8 V), the intelligent control unit reduces the current setting value to prevent overload; when the electrolyte temperature is in the optimal interval (60–80℃) and the photovoltaic power supply is sufficient, the current setting value is increased to the upper limit to ensure the hydrogen yield; if the electrolyte temperature rises above 85℃, the current setting value is automatically reduced to avoid overheating.

[0046] 4. Pulse frequency and duty cycle adjustment: When the current density increases and the bubble accumulation is serious, the control unit automatically increases the pulse frequency (such as from 30 Hz to 60 Hz) to enhance the bubble detachment; when the voltage is unstable due to wind-solar power fluctuations, the duty cycle is automatically reduced (such as from 70% to 50%) to buffer the load.

[0047] 5. Circulating pump flow adjustment: When the electrolyte temperature is detected to be uneven or the gas production rate fluctuates, the circulating pump flow is automatically increased to speed up the electrolyte circulation rate and ensure the mass transfer of the slurry; when the power is insufficient, the circulating pump speed is reduced to the energy-saving mode to reduce the overall energy consumption of the system.

[0048] Although the specific embodiments of the present application have been described above with reference to the accompanying drawings, the description is not a limitation on the scope of protection of the present application, and those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the scope of protection of the present application.

Claims

1. A coal slurry electrolysis hydrogen production system based on solar power supply and heating, characterized in that, It comprises: A photovoltaic power supply and heating unit for converting solar energy into electrical energy and heat energy, the electrical energy is provided to the electrolytic cell after power regulation and pulse modulation by the power controller and pulse controller for the electrolysis process of the coal slurry, the heat energy is used to heat the coal slurry in the electrolysis process through the heat exchanger, and is provided to the electrolysis reaction unit through the circulating pump; A coal slurry preparation unit for crushing, screening and mixing low-rank coal with dispersing agent, dilute acid or dilute alkali to prepare coal slurry, and delivering the coal slurry to the preheating module; An electrolysis reaction unit for electrolyzing the coal slurry in the electrolytic cell using the electrical energy provided by the photovoltaic power supply and heating unit, so that the coal slurry undergoes oxidation-reduction reaction under the action of electric field to obtain hydrogen gas; An intelligent control unit for adjusting the operating parameters of the coal slurry electrolysis hydrogen production system, the operating parameters including current set value, voltage set value, stirring speed and pulse modulation parameters.

2. The solar energy based power and heat supply coal slurry electrolysis hydrogen production system according to claim 1, characterized in that, The photovoltaic power supply and heating unit comprises a solar cell panel, the front surface of the solar cell panel is used for photoelectric conversion, the back surface is attached with a heat exchange assembly, the heat exchange assembly adopts a heat exchange substrate and a coil structure for collecting the waste heat generated during the operation of the solar cell panel.

3. The solar energy based power and heat supply coal slurry electrolysis hydrogen production system according to claim 2, characterized in that, The coil structure is connected with a heat exchanger, the heat exchanger is further connected with a coal slurry storage tank, the coal slurry in the coal slurry storage tank is preheated by the heat exchanger and then delivered to the electrolytic cell of the electrolysis reaction unit through the circulating pump.

4. The solar energy based power and heat supplied coal slurry electrolysis hydrogen production system according to claim 3, characterized in that, The pulse controller applies a rectangular pulse signal to the electrical energy converted from solar energy, and provides pulse current to the electrolysis reaction unit.

5. The solar energy based power and heat supplied coal slurry electrolysis hydrogen production system according to claim 1, characterized in that, The coal slurry preparation unit comprises a stirring and mixing device connected with the coal slurry storage tank through a slurry delivery pump.

6. The solar energy based power and heat supplied coal slurry electrolysis hydrogen production system according to claim 1, characterized in that, The electrolysis reaction unit comprises an electrolytic cell, the electrolytic cell is provided with a cathode and an anode, and a cation exchange membrane is arranged between the cathode and the anode.

7. The solar energy based power and heat supplied coal slurry electrolysis hydrogen production system as claimed in claim 1, wherein, It also comprises a gas separation and purification unit, which comprises a condenser, a primary water removal device and a packed adsorption tower connected in sequence.

8. The solar energy based power and heat supplied coal slurry electrolysis hydrogen production system as claimed in claim 1, wherein, The intelligent control unit comprises a data acquisition module and an embedded controller connected with each other; the data acquisition module comprises an illumination sensor and a current-voltage collector installed on the photovoltaic power supply and heating unit, and an electrolyte temperature sensor installed on the electrolysis reaction unit; the embedded controller is embedded with a GA-BP neural network model.

9. A method for hydrogen production by coal slurry electrolysis based on solar power supply and heating, which is implemented by using the system according to any one of claims 1-8, characterized in that, It comprises the following steps: The photovoltaic power supply and heating unit converts solar energy into electrical energy and heat energy, the electrical energy is provided to the electrolytic cell after voltage stabilization and pulse modulation for the electrolysis process of the coal slurry, the heat energy is used to preheat the coal slurry in the electrolysis process, and is provided to the electrolysis reaction unit through the circulating pump; Crushing and screening low-rank coal, and mixing low-rank coal with dispersing agent, dilute acid or dilute alkali to prepare coal slurry, and delivering the coal slurry to the preheating unit for preheating by the heat exchanger; Using the electrical energy provided by the photovoltaic power supply and heating unit to electrolyze the coal slurry, so that the coal slurry undergoes oxidation-reduction reaction under the action of electric field to obtain hydrogen gas, and the intelligent control unit is used to optimize the operating parameters in real time.

10. The solar power and heat based coal slurry electrolysis hydrogen production method as claimed in claim 9, wherein, The intelligent control unit optimizes the operating parameters in real time, which specifically includes: Real-time acquisition of voltage, current, electrolyte temperature and illumination intensity of the system; The data are input into the GA-BP neural network model of the intelligent control unit, and current setting value, stirring speed and pulse modulation parameters are output; The power controller, the pulse controller and the circulating pump are adjusted according to the output operation parameters.

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