SOEC electrolysis coal mine sewage hydrogen production system and method

Abstract

The invention discloses an SOEC electrolysis coal mine sewage hydrogen production system and method, and belongs to the technical field of sewage environmental protection. The system comprises a sewage treatment module, a new energy power generation module, an SOEC, a preheater, an evaporator, a heater, a hydrogen utilization module and a waste heat utilization module. The sewage treatment module, the new energy power generation module, the SOEC, the preheater, the evaporator and the heater are connected in sequence; the new energy power generation module is connected with the SOEC; a hydrogen outlet of the SOEC is sequentially connected with gas inlets of the heater and the preheater, and gas outlets of the heater and the preheater are connected with the hydrogen utilization module; and an oxygen outlet of the SOEC is connected with the waste heat utilization module. Photovoltaic energy and wind energy are used for supplying power to the SOEC, the green industry policy is met, the operation cost of the SOEC is reduced, meanwhile, new energy waste is reduced, and comprehensive economic benefits are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage environmental protection, and in particular relates to a system and method for producing hydrogen by electrolyzing coal mine sewage using a SOEC (Sodium Electrolyte Concentrator) electrolysis system. Background Art

[0002] The main sources of coal mine wastewater are usually groundwater infiltration and mine water. Specifically, these wastewaters may come from the following aspects: Groundwater infiltration: During the mining process of coal mines, surface water and groundwater may seep into the mine through cracks. Due to the collapse of the ore body, a connection with the surrounding groundwater system is formed, resulting in groundwater infiltration. During the coal mining process, groundwater comes into contact with minerals and pollutants in the ore to form polluted water bodies. Water generated by mining activities: Water generated during the mining process, such as spray dust suppression, equipment cooling water, etc., may also become part of the sewage. Wastewater discharge: Water used in the coal mine production process, such as coal washing, discharged wastewater, etc., may become a source of water pollution if it is not effectively treated or recycled after different treatments.

[0003] Investigations have shown that the most common source of coal mine wastewater is typically groundwater seepage, which forms polluted water bodies during the coal mining process. The impurities in coal mine wastewater are complex, primarily including: 1) Suspended matter: primarily coal dust, silt, and mineral particles. These suspended matter may enter the wastewater during the mining process, groundwater seepage, or mine ventilation. 2) Heavy metals: heavy metals such as lead, cadmium, mercury, arsenic, copper, and zinc. These heavy metals originate naturally in the ore, but may also be present as wastewater and exhaust emissions from coal mining, or as byproducts of ore processing. 3) Organic pollutants: chemical reagents used in coal mining (such as flotation agents and coal washing agents) may remain in the wastewater. Furthermore, domestic wastewater and oil pollution in mining areas can also contribute to organic pollutants. 4) Acidic substances: Acidic mine water (such as acid mine drainage) may occur in coal mining areas. This is primarily due to acidic substances, such as sulfuric acid, produced when ore comes into contact with water. The formation of acidic mine water is associated with high sulfur content in the ore, which can lead to water acidification. 5) Soluble salts: including sulfates, chlorides, carbonates, etc. These salts usually originate from the dissolution of groundwater and the dissolution of minerals in mine water, and may be further increased during the mining process. 6) Ammonia nitrogen and other nitrogen compounds: Coal mine wastewater may contain nitrogen compounds such as ammonia nitrogen, nitrite, and nitrate. The sources include chemical reactions in mine water and wastewater treatment. 7) Radioactive substances: Coal seams may contain trace amounts of radioactive elements (such as uranium, radium, etc.). These elements dissolve in mine water and may cause radioactive contamination. 8) Microorganisms and pathogens in water: Coal mine wastewater may contain pathogenic microorganisms, such as bacteria, fungi, viruses, etc., especially when mine water interacts with surface water, which may cause water quality deterioration.

[0004] In the existing coal mine wastewater treatment technology, the existing technical problem is that the existing technology focuses on pollutant removal and then discharges the treated wastewater, which may cause secondary pollution and ignores the resource utilization of wastewater. In addition, the cost of establishing a full-process sewage treatment device is too high and leads to waste of resources. Summary of the Invention

[0005] The purpose of the present invention is to provide a SOEC electrolysis coal mine wastewater hydrogen production system and method, which is used to solve the technical problems of low treatment efficiency and secondary pollution caused by waste of resources in traditional technologies.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The invention discloses a hydrogen production system for electrolyzing coal mine sewage using a SOEC, which comprises: a sewage treatment module, a new energy power generation module, an SOEC, a preheater, an evaporator, a heater, a hydrogen utilization module and a waste heat utilization module; the sewage treatment module, the new energy power generation module, the SOEC, the preheater, the evaporator and the heater are connected in sequence; the new energy power generation module is connected to the SOEC; the hydrogen outlet of the SOEC is connected to the gas inlets of the heater and the preheater in sequence, and the gas outlets of the heater and the preheater are connected to the hydrogen utilization module; and the oxygen outlet of the SOEC is connected to the waste heat utilization module.

[0008] Furthermore, the sewage treatment module includes a belt screen, a sedimentation tank, a chemical reaction tank, an ion exchange tank, a neutralization tank, a reverse osmosis membrane, a denitrification tank, an organic matter adsorption tank and a disinfection tank which are connected in sequence.

[0009] Furthermore, the new energy power generation module includes a wind power generation device, a photovoltaic power generation device, a rectifier, a first filter, a second filter, a first DC-DC converter, a second DC-DC converter, a third DC-DC converter and a battery;

[0010] The wind power generation device, the rectifier, the first filter and the first DC-DC converter are sequentially connected in series to form a first series circuit;

[0011] The photovoltaic power generation device, the second filter and the second DC-DC converter are connected in series in sequence to form a second series circuit;

[0012] After the first series circuit and the second series circuit are merged, they are connected to the battery and the third DC-DC converter in sequence.

[0013] Furthermore, the hydrogen utilization module includes a condenser, a first pressure reducing valve, a hydrogen storage tank and a circulation compressor; the gas outlets of the heater and the preheater are connected to the gas inlet of the condenser, and the gas outlet of the condenser is connected to the first pressure reducing valve and the hydrogen storage tank in turn; the gas outlet of the condenser is connected to the inlet of the circulation compressor; and the outlet of the circulation compressor is connected to the output end of the evaporator.

[0014] Furthermore, the waste heat utilization module includes a waste heat recovery device, a second pressure reducing valve and an oxygen storage tank; the oxygen outlet of the SOEC is connected to the waste heat recovery device, the second pressure reducing valve and the oxygen storage tank in sequence.

[0015] Furthermore, the SOEC comprises an anode channel, a cathode channel, an anode, a cathode, an electrolyte and a connector.

[0016] Furthermore, the hydrogen at the hydrogen outlet of the SOEC is the cathode gas product, and the oxygen at the oxygen outlet is the anode gas product.

[0017] Furthermore, the heater is a ceramic heater.

[0018] Furthermore, the preheater is a liquid water preheater.

[0019] The present invention also discloses a method for using the SOEC electrolysis coal mine wastewater hydrogen production system, comprising the following steps:

[0020] The sewage is placed in the sewage treatment module for treatment to obtain treated water; the treated water is first preheated in a preheater, then passed into an evaporator for evaporation, and then passed into a heater to continue heating to the temperature required for electrolysis in the SOEC, and then enters the SOEC for electrolysis. During the electrolysis process, the new energy power generation module continuously generates electricity for the electrolysis process, and the hydrogen obtained by electrolysis passes through the heater and preheater in sequence from the hydrogen outlet of the SOEC, and then enters the hydrogen utilization module; the oxygen obtained by electrolysis enters the waste heat utilization module from the oxygen outlet of the SOEC.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention discloses a SOEC electrolysis coal mine sewage hydrogen production system, which is provided with a sewage treatment module, a new energy power generation module, a SOEC, a preheater, an evaporator, a heater, a hydrogen utilization module and a waste heat utilization module. The new energy power generation module uses photovoltaic and wind energy to power the SOEC, which complies with the green industry policy, reduces the operating cost of the SOEC, and at the same time reduces the waste of new energy and improves the overall economic benefits. By providing a waste heat utilization module, through the "heat energy recovery-multi-stage utilization" strategy, energy efficiency is improved and operating costs are reduced. This design meets the needs of industrial green transformation. The synergistic effect of each module realizes the resource utilization of coal mine sewage, reduces the overall cost, realizes energy self-sufficiency and the construction of a circular ecology in the mining area, and provides a path of "green transformation + industrial upgrading" for the coal mining industry, solving the problems of low processing efficiency, resource waste and possible secondary pollution of traditional technologies.

[0023] Furthermore, unlike wastewater treatment systems in other fields, this system is designed for the specific scenario of coal mine wastewater treatment. Compared to other similar wastewater treatment patents, its key differences are as follows: First, this patent adopts a wind and solar multi-energy synergistic power supply model, addressing the volatility of a single renewable energy source through intelligent regulation and ensuring the continuous and stable operation of the SOEC system under high-temperature electrolysis conditions. Second, the system integrates a cascade waste heat utilization device, utilizing and storing waste heat from the SOEC high-temperature electrolysis products in different ways. This patent provides an integrated "treatment-reuse-production" solution for coal mine wastewater, meeting the development needs of green mining and the circular economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the SOEC electrolysis coal mine wastewater hydrogen production system of the present invention;

[0025] Figure 2 This is a schematic structural diagram of the sewage treatment module of the present invention;

[0026] Figure 3 This is a structural diagram of the new energy power generation module of the present invention.

[0027] Among them: 1- sewage treatment module; 2- new energy power generation module; 2-1: wind power generation device; 2-2: photovoltaic power generation device; 2-3: rectifier; 2-4-1: first filter; 2-4-2: second filter; 2-5-1: first DC-DC converter; 2-5-2: second DC-DC converter; 2-5-3: third DC-DC converter; 2-6: battery; 3- SOEC; 4- preheater; 5- evaporator; 6- heater; 7- condenser; 8- first pressure reducing valve; 9- hydrogen storage tank; 10- circulating compressor; 11- waste heat recovery device; 12- waste heat recovery device; 13- oxygen storage tank. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] The present invention is described in further detail below with reference to the accompanying drawings:

[0031] like Figure 1 As shown, the present invention discloses a SOEC electrolysis coal mine wastewater hydrogen production system, comprising a sewage treatment module 1, a new energy power generation module 2, an SOEC 3, a preheater 4, an evaporator 5, a heater 6, a hydrogen utilization module, and a waste heat utilization module. The output end of the sewage treatment module 1 is connected to the input end of the preheater 4; the output end of the preheater 4 is connected to the input end of the evaporator 5; the output end of the evaporator 5 is connected to the input end of the heater 6; the output end of the heater 6 is connected to the input end of the SOEC 3; the new energy power generation module 2 is connected to the SOEC 3; wherein the preheater 4 is a liquid water preheater, the evaporator 5 is a high-temperature evaporator, and the heater 6 is a ceramic heater. The hydrogen outlet of the SOEC 3 is connected to the heater 6 and the gas inlet of the preheater 4 in sequence, and the gas outlets of the heater 6 and the preheater 4 are connected to the hydrogen utilization module; the oxygen outlet of the SOEC 3 is connected to the waste heat utilization module.

[0032] like Figure 2 As shown, the sewage treatment module 1 of the present invention includes a belt screen, a sedimentation tank, a chemical reaction tank, an ion exchange tank, a neutralization tank, a reverse osmosis membrane, a denitrification tank, an organic adsorption tank, and a disinfection tank, and the above devices are connected in series in sequence.

[0033] like Figure 3 As shown, the new energy power generation module 2 of the present invention includes a wind power generation device 2-1, a photovoltaic power generation device 2-2, a rectifier 2-3, a first filter 2-4-1 and a second filter 2-4-2, a first DC-DC converter 2-5-1, a second DC-DC converter 2-5-2 and a third DC-DC converter 2-5-3, and a battery 2-6;

[0034] The wind power generation device 2-1 in the new energy power generation module is connected to the rectifier 2-3, the rectifier 2-3 is connected in series with the first filter 2-4-1 and the first DC-DC converter 2-5-1 in sequence, the photovoltaic power generation device 2-2 is connected in series with the second filter 2-4-2 and the second DC-DC converter 2-5-2 in sequence, the first DC-DC converter 2-5-1 and the second DC-DC converter 2-5-2 are connected to the battery 2-6, and the battery 2-6 is connected to the third DC-DC converter 2-5-3.

[0035] Preferably, the SOEC 3 comprises an anode channel, a cathode channel, an anode, a cathode, an electrolyte, and a connector.

[0036] Preferably, the cathode gas product hydrogen of the SOEC is connected to a ceramic heater; then connected to a liquid water preheater; and further connected to a condenser 7; the condenser 7 leads to a pressure reducing valve 8 and a circulating compressor 10 respectively; the pressure reducing valve 8 is connected to a hydrogen storage tank 9; and the circulating compressor 10 is connected to the output end of the high-temperature evaporator.

[0037] Preferably, the anode gas product oxygen of the SOEC is connected to the waste heat recovery device 11 ; the waste heat recovery device 11 is connected to the second pressure reducing valve 12 , and the second pressure reducing valve 12 is connected to the oxygen storage tank 13 .

[0038] The present invention also discloses a method for using the SOEC electrolysis coal mine wastewater hydrogen production system, comprising the following steps:

[0039] Coal mine wastewater enters wastewater treatment module 1 for treatment. The treated wastewater is first preheated in a liquid water preheater, then evaporated in a high-temperature evaporator, and then further heated in a ceramic heat exchanger. The electrolysis feed steam then enters SOEC 3 for electrolysis. New energy power generation module 2 provides continuous and stable power to SOEC 3. The electrolysis products, hydrogen and oxygen, are respectively utilized for waste heat recovery and stored. The hydrogen gas produced by cathode electrolysis in SOEC 3 flows sequentially through the ceramic heater and liquid water preheater. The flow through the ceramic heater provides heat for heating the water vapor, while the flow through the liquid water preheater provides heat for preheating the treated liquid water. Part of the hydrogen gas, cooled by condenser 7, is introduced into the electrolysis feed steam to form a mixed gas, and the remaining part is stored. The oxygen gas produced by anode electrolysis in SOEC 3 is passed into waste heat recovery device 11 for waste heat recovery. The heat in waste heat recovery device 11 is used to heat domestic water in the mining area, and the oxygen after heat exchange is stored, thereby reducing energy loss and improving energy utilization.

[0040] Example 1

[0041] Reference Figure 1 , which is the first embodiment of the present invention, provides a SOEC electrolysis coal mine wastewater hydrogen production system based on photovoltaic power generation and wind power generation, which mainly includes a sewage treatment module 1, a new energy power generation module 2, a SOEC3, a liquid water preheater, a high-temperature evaporator, a ceramic heater, a condenser 7, a first pressure reducing valve 8 and a second pressure reducing valve 12, a hydrogen storage tank 9, a circulating compressor 10, a waste heat recovery device 11, and an oxygen storage tank 13.

[0042] like Figure 1 As shown, the coal mine sewage to be treated is connected to the sewage treatment module 1; the output end of the sewage treatment module 1 is connected to the input end of the liquid water preheater; the output end of the liquid water preheater is connected to the input end of the high-temperature evaporator; the output end of the high-temperature evaporator is connected to the input end of the ceramic heater; the output end of the ceramic heater is connected to the input end of the SOEC 3, and the new energy power generation module 2 is connected to the SOEC 3; the hydrogen gas product of the cathode electrolysis gas of the SOEC 3 flows through the ceramic heater and the liquid water preheater in sequence, and then connected to the condenser 7, the condenser 7 is connected to the circulating compressor 10 and the first pressure reducing valve 8, the circulating compressor 10 is connected to the output end of the high-temperature evaporator, and the first pressure reducing valve 8 is connected to the hydrogen storage tank 9.

[0043] Among them, sewage treatment module 1 is a module for pre-treating coal mine sewage, the liquid water preheater is a device for preheating treated sewage, the high-temperature evaporator is a device for evaporating and heating the treated sewage, and the ceramic heater is a device for further heating water vapor to reach the electrolysis temperature required in SOEC 3; the new energy power generation module 2 uses two new energy power generation methods, wind power generation and photovoltaic power generation, to power SOEC 3 to ensure its stable and efficient operation; the waste heat utilization method is a method for recycling the electrolysis products of SOEC 3.

[0044] Preferably, since the water vapor temperature required for electrolysis in the SOEC 3 is very high, a liquid water preheater, a high-temperature evaporator, and a ceramic heater are provided to heat and evaporate the treated sewage to meet the requirements for electrolysis.

[0045] Preferably, the method sets up a waste heat utilization path, SOEC3 is divided into an anode, a cathode, an anode channel, a cathode channel, an electrolyte, and a connector, water vapor flows into the cathode channel, and after electrolysis, hydrogen flows out of the cathode channel, and oxygen flows out of the anode channel; the hydrogen product of the cathode electrolysis of SOEC 3 is first passed into a ceramic heater to heat the water vapor, and then flows through a liquid water preheater to preheat the treated sewage; the hydrogen after heat exchange is then passed into a condenser 7 to cool down, and the water vapor that has not been electrolyzed is separated; the oxygen product of the anode electrolysis of SOEC 3 is passed into a waste heat recovery device 11 for heat exchange, and is used to heat domestic water in the living area of the mining area. The oxygen after heat exchange is stored after the pressure is reduced by a second pressure reducing valve 12.

[0046] Preferably, part of the pure dry hydrogen cooled by the condenser 7 is reduced in pressure by the first pressure reducing valve 8 and then stored, and part is mixed with water vapor and passed into the ceramic heater 6, and then into the SOEC 3, so as to provide a reducing environment for the electrolysis process of water vapor, optimize the reaction conditions, and improve the electrolysis efficiency and system stability.

[0047] Example 2

[0048] Reference Figure 2 , is the second embodiment of the present invention, which provides a sewage treatment module, such as Figure 2 As shown, the sewage treatment module mainly includes a belt screen, a sedimentation tank, a chemical reaction tank, an ion exchange tank, a neutralization tank, a reverse osmosis membrane, a denitrification tank, an organic matter adsorption tank, and a disinfection tank.

[0049] Preferably, because the coal mine wastewater mainly comes from groundwater infiltration and the types of impurities are relatively complex, the wastewater treatment module removes most of the impurities in the coal mine wastewater to achieve the purity required for electrolysis in SOEC 3.

[0050] Example 3

[0051] Reference Figure 3 , which is the third embodiment of the present invention, provides a new energy power generation method by setting up wind power generation and photovoltaic power generation devices to generate electricity.

[0052] The SOEC 3 is preferably powered by direct current (DC). Since wind power is generated by alternating current (AC), a series of conversion steps are required. A rectifier 2-3 is used to convert the AC power into direct current (DC). The rectified DC power may fluctuate, requiring a first filter 2-4-1 to smooth the voltage to achieve a more stable DC power supply. A first DC-DC converter 2-5-1 then regulates the input voltage to match the charging voltage requirements of the battery 2-6. Photovoltaic power generation devices directly generate DC power, but the voltage fluctuates with changes in light intensity and temperature. Therefore, a second filter 2-4-2 is provided to smooth the photovoltaic power generation voltage. A second DC-DC converter 2-5-2 is then used to adjust the voltage to an appropriate range to match the charging voltage requirements of the battery 2-6. The battery is connected to a third DC-DC converter 2-5-3, which provides stable DC power to the SOEC 3 based on its operating conditions, ensuring efficient and stable operation of the electrolytic cell.

[0053] Preferably, the new energy generation module 2 is equipped with a filter and a DC-DC converter. The filter ensures efficient and stable operation of the power generation system by suppressing interference, smoothing waveforms, and protecting equipment. The DC-DC converter maintains a stable output voltage through efficient and flexible voltage conversion to meet load adaptation.

[0054] Example 4

[0055] The method for using the SOEC electrolysis coal mine wastewater hydrogen production system described in the present invention realizes the effective utilization of coal mine wastewater. The system integrates sewage treatment, new energy power generation, and waste heat utilization, realizes the automated control and resource utilization of the coal mine wastewater hydrogen production process, and improves energy utilization. The sewage treatment module 1 can purify sewage and reduce pollution to the environment. The new energy power generation module 2 utilizes wind power generation and photovoltaic power generation as the two pillars of renewable energy, has significant environmental, economic and social benefits, and is a core technology for promoting global energy transformation and responding to climate change. The setting of the waste heat utilization module can reduce energy loss and further reduce costs. The present invention forms a complete hydrogen production process. In addition, with the continuous advancement of sewage treatment technology and new energy power generation technology, the system will have broader prospects and application markets.

[0056] The above content is only for explaining the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A SOEC electrolysis coal mine wastewater hydrogen production system, characterized in that: include: A sewage treatment module (1), a new energy power generation module (2), an SOEC (3), a preheater (4), an evaporator (5), a heater (6), a hydrogen utilization module and a waste heat utilization module; the sewage treatment module (1), the new energy power generation module (2), the SOEC (3), the preheater (4), the evaporator (5) and the heater (6) are connected in sequence; the new energy power generation module (2) is connected to the SOEC (3); the hydrogen outlet of the SOEC (3) is connected to the gas inlet of the heater (6) and the preheater (4) in sequence, and the gas outlets of the heater (6) and the preheater (4) are connected to the hydrogen utilization module; the oxygen outlet of the SOEC (3) is connected to the waste heat utilization module.

2. A SOEC electrolysis coal mine wastewater hydrogen production system according to claim 1, characterized in that: The sewage treatment module (1) comprises a belt screening machine, a sedimentation tank, a chemical reaction tank, an ion exchange tank, a neutralization tank, a reverse osmosis membrane, a denitrification tank, an organic matter adsorption tank and a disinfection tank, which are connected in sequence.

3. A SOEC electrolysis coal mine wastewater hydrogen production system according to claim 1, characterized in that: The new energy power generation module (2) comprises a wind power generation device (2-1), a photovoltaic power generation device (2-2), a rectifier (2-3), a first filter (2-4-1), a second filter (2-4-2), a first DC-DC converter (2-5-1), a second DC-DC converter (2-5-2), a third DC-DC converter (2-5-3), and a battery (2-6); The wind power generation device (2-1), the rectifier (2-3), the first filter (2-4-1) and the first DC-DC converter (2-5-1) are sequentially connected in series to form a first series circuit; The photovoltaic power generation device (2-2), the second filter (2-4-2) and the second DC-DC converter (2-5-2) are sequentially connected in series to form a second series circuit; After the first series circuit and the second series circuit are merged, they are connected to the battery (2-6) and the third DC-DC converter (2-5-3) in sequence.

4. A SOEC electrolysis coal mine wastewater hydrogen production system according to claim 1, characterized in that: The hydrogen utilization module comprises a condenser (7), a first pressure reducing valve (8), a hydrogen storage tank (9) and a circulation compressor (10); the gas outlets of the heater (6) and the preheater (4) are connected to the gas inlet of the condenser (7), and the gas outlet of the condenser (7) is connected to the first pressure reducing valve (8) and the hydrogen storage tank (9) in sequence; the gas outlet of the condenser (7) is connected to the inlet of the circulation compressor (10); and the outlet of the circulation compressor (10) is connected to the output end of the evaporator (5).

5. The SOEC electrolysis coal mine wastewater hydrogen production system according to claim 1, characterized in that: The waste heat utilization module comprises a waste heat recovery device (11), a second pressure reducing valve (12) and an oxygen storage tank (13); the oxygen outlet of the SOEC (3) is connected to the waste heat recovery device (11), the second pressure reducing valve (12) and the oxygen storage tank (13) in sequence.

6. A SOEC electrolysis coal mine wastewater hydrogen production system according to claim 1, characterized in that: The SOEC (3) comprises an anode channel, a cathode channel, an anode, a cathode, an electrolyte and a connector.

7. The SOEC electrolysis coal mine wastewater hydrogen production system according to claim 1, characterized in that: The hydrogen at the hydrogen outlet of the SOEC (3) is the cathode gas product, and the oxygen at the oxygen outlet is the anode gas product.

8. The SOEC electrolysis coal mine wastewater hydrogen production system according to claim 1, characterized in that: The heater (6) is a ceramic heater.

9. The SOEC electrolysis coal mine wastewater hydrogen production system according to claim 1, characterized in that: The preheater (4) is a liquid water preheater.

10. The method for using the SOEC electrolysis coal mine wastewater hydrogen production system according to any one of claims 1 to 9, characterized in that: The following steps are involved: Sewage is placed in a sewage treatment module (1) for treatment to obtain treated water; the treated water is first preheated by a preheater (4), then passed into an evaporator (5) for evaporation, then passed into a heater (6) to continue heating and raising the temperature to the temperature required for electrolysis in the SOEC (3), and then enters the SOEC (3) for electrolysis. During the electrolysis process, the new energy power generation module (2) continuously generates electricity for the electrolysis process, and the hydrogen obtained by electrolysis passes through the heater (6) and the preheater (4) in sequence from the hydrogen outlet of the SOEC (3), and then enters the hydrogen utilization module; the oxygen obtained by electrolysis enters the waste heat utilization module from the oxygen outlet of the SOEC (3).

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