Low-energy-consumption instant-stop instant-start type green hydrogen production system for thermal power plant
By designing a low-energy, on-demand green hydrogen system in thermal power plants, and combining it with wind and solar power generation and high-temperature steam systems, the problems of fluctuation adaptation and high cost in existing green hydrogen production technologies have been solved. This has enabled efficient and safe green hydrogen production and combustion, as well as desulfurization, which helps thermal power plants save energy and reduce emissions.
Patent Information
- Application Number
- CN202520384689.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-06
AI Technical Summary
Among existing technologies, alkaline water electrolysis technology has low cost but struggles to overcome the volatility of renewable energy; PEM electrolyzers have low single-cell output and high cost; and solid oxide electrolysis hydrogen production technology operates under harsh conditions, limiting its application.
Design a low-energy, on-demand, start-stop green hydrogen production system for thermal power plants. The system is interconnected with devices such as a steam supply unit, a steam regulation unit, an SOEC fuel cell stack, and a pressure transmitter. Combined with a wind and solar power generation unit, it utilizes the high-temperature steam system and compressed air system of the thermal power plant to achieve rapid heating and stable electrolysis. It adopts miniaturized fuel cell stack modules and high-efficiency preheaters to adapt to fluctuating energy sources such as wind and solar power.
It achieves low energy consumption, high safety, and instant start-up of green hydrogen production, reducing initial investment costs and improving combustion and desulfurization efficiency. The produced green hydrogen can be used for generator cooling and green ammonia synthesis to help save energy and reduce emissions.
Smart Images
Figure CN223906966U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of low-energy-consumption stop-start type green hydrogen system of thermal power plant. BACKGROUND
[0002] Hydrogen plays an important role in the operation of thermal power plants. In the traditional sense, hydrogen is used as a rotor cooling gas for generators, and the gas consumption is relatively small. Small-scale water electrolysis hydrogen stations or hydrogen gas storage containers are generally used for gas supply. Green ammonia is called green ammonia because it is made from green hydrogen. Therefore, the stable and low-energy-consumption production of green hydrogen is the key to the reform of traditional thermal power plant processes, and the demand for hydrogen in thermal power plants will increase exponentially.
[0003] However, current green hydrogen production faces the same problems. Although the existing alkaline water electrolysis technology has low cost, it cannot overcome the volatility of renewable energy. Although the existing PEM electrolytic cell can adapt to fluctuating power supplies, it is limited by the preparation technology of cation exchange membrane, which makes it difficult to increase the output of single tank and increase the manufacturing cost. The anion exchange membrane is currently in the laboratory stage. Although the solid oxide electrolysis hydrogen production technology has low energy consumption and resistance to fluctuating power supply, its harsh working conditions also limit its application.
[0004] Therefore, how to design a low-energy-consumption stop-start type green hydrogen system for thermal power plants is an urgent problem for technicians in the field to solve. INVENTION CONTENTS
[0005] The utility model aims to solve the above problems of the prior art and provides a low-energy-consumption stop-start type green hydrogen system for thermal power plants. The system achieves low-energy-consumption green hydrogen production through the interconnection of various devices. The utility model achieves this purpose as follows:
[0006] The utility model provides a kind of low-energy-consumption stop-start type green hydrogen system for thermal power plants, including the communication of steam supply unit, steam regulation unit, SOEC electric pile and pressure transmitter in turn, the SOEC electric pile is communicated with compressed air primary preheater by first pipeline, and the other side of the compressed air primary preheater is communicated with desulfurization unit and combustion unit, the SOEC electric pile is also communicated with compressed air secondary preheater by second pipeline, the compressed air primary preheater is communicated with air compressor, the compressed air primary preheater is also communicated with compressed air secondary preheater, the compressed air secondary preheater is communicated with SOEC electric pile by third pipeline, the compressed air secondary preheater is communicated with hydrogen cooler, the hydrogen cooler is communicated with hydrogen compressor, the hydrogen compressor is communicated with hydrogen storage tank, and the second pipeline is communicated with first temperature measuring unit;Hydrogen pressure regulating valve and hydrogen flowmeter are sequentially communicated on the pipeline between the hydrogen cooler and the hydrogen compressor.
[0007] Further, in order to give full play to the SOEC (solid oxide) electrolytic hydrogen production technology itself, the advantages of wide range of adjustment and low energy consumption, without the need to equip energy storage, it can be adapted to the coupling of fluctuating energy such as wind and light, and can achieve high safety, low energy consumption, and hydrogen production of stop and start, which also includes a wind and light power generation part, the wind and light power generation part is electrically connected with the SOEC stack, and the wind and light power generation part is also electrically connected with the steam heat regulator.
[0008] Further, the pipeline between the compressed air primary preheater and the desulfurization part is also communicated with an oxygen pressure regulating valve, the compressed air from the air compressor is heated by the primary preheater and the secondary preheater, and the heated compressed air is taken out of the electrolytic cell as a carrier gas to carry the oxygen generated by the SOEC stack electrolysis, the high-temperature oxygen and air mixture is returned to the primary preheater through the first pipeline, the high-temperature oxygen and air mixture preheats the compressed air entering behind, enters the desulfurization part and the combustion part, and becomes the raw material for desulfurization oxidation and combustion, and the regulating valve is convenient for adjusting opening and closing.
[0009] Further, in order to let the high-temperature steam pass into the stack respectively, the SOEC stack can realize rapid heating and temperature rising, the SOEC stack is designed according to the gas demand, and small-sized stack modules are stacked to ensure that each module separately enters steam and realizes rapid heating and temperature rising.
[0010] Further, in order to better adjust the steam flow, the steam supply part comprises a steam flow regulating valve.
[0011] Further, in order to better adjust the temperature of the steam, the steam regulating part comprises a steam pressure reducing valve, a steam flow regulating valve, a steam flow meter and a steam heat regulator which are sequentially communicated.
[0012] Further, in order to more accurately detect the temperature, the first temperature measuring part comprises a thermometer.
[0013] Compared with the prior art, the utility model has the advantages that: the utility model gives full play to the SOEC electrolytic hydrogen production technology itself, the advantages of wide range of adjustment and low energy consumption, without the need to equip energy storage, it can be adapted to the coupling of fluctuating energy such as wind and light, and can achieve high safety, low energy consumption, and hydrogen production of stop and start,
[0014] By relying on the high-temperature steam system, compressed air system and cooling circulation system owned by the thermal power plant, the public auxiliary conditions of the SOEC system are created at low cost, the initial investment cost is effectively reduced, and the SOEC system working condition can be quickly reached, and the stop and start can be achieved.
[0015] The green hydrogen produced by the device can not only be used for rotor cooling of the generator of the thermal power plant, but also be used for synthesizing green ammonia for denitration, desulfurization and ammonia blending combustion, and effectively helps the energy saving and emission reduction of the thermal power plant.
[0016] By the oxygen-enriched compressed air produced by the system, the combustion and desulfurization processes of the thermal power plant can be used, thereby improving the combustion and desulfurization efficiency.
[0017] By preheating the compressed air by preheating, the energy consumption of the SOEC stack auxiliary equipment is effectively saved, and the overall electrolytic hydrogen production energy consumption is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is a kind of low energy consumption stop and start type green hydrogen system of thermal power plant principle diagram of pipeline;
[0019] In the figure: 1, steam supply part, 2, steam adjusting part, 3, steam pressure reducing valve, 4, steam flow regulating valve, 5, steam flow meter, 6, steam heat regulator, 7, SOEC stack, 8, pressure transmitter, 9, first pipeline, 10, compressed air primary preheater, 11, second pipeline, 12, compressed air secondary preheater, 13, air compressor, 14, gas-water separator, 15, hydrogen flow meter, 16, hydrogen compressor, 17, hydrogen storage tank, 18, first temperature measuring part, 19, third pipeline, 20, wind and light power generation part, 21, desulfurization part, 22, combustion part, 23, oxygen pressure regulating valve, 24, hydrogen pressure regulating valve, 25, hydrogen cooler. DETAILED DESCRIPTION
[0020] In order to deepen the understanding of the utility model, the utility model will be further described in combination with examples and drawings below, and the examples are only used to explain the utility model and do not constitute a limitation on the protection scope of the utility model.
[0021] Please refer to Figure 1 The embodiment of the utility model provides a kind of low energy consumption stop and start type green hydrogen system of thermal power plant, including sequentially communicating steam supply part 1, steam adjusting part 2, SOEC stack 7 and pressure transmitter 8, SOEC stack 7 is communicated with compressed air primary preheater 10 by first pipeline 9, another side of the compressed air primary preheater 10 is communicated with desulfurization part 21 and combustion part 22, SOEC stack 7 is also communicated with compressed air secondary preheater 12 by second pipeline 11, compressed air primary preheater 10 is communicated with air compressor 13, compressed air primary preheater 10 is also communicated with compressed air secondary preheater 12, compressed air secondary preheater 12 is communicated SOEC stack 7 by third pipeline 19, compressed air secondary preheater 12 is communicated with hydrogen cooler 25, hydrogen cooler 25 is communicated with hydrogen compressor 16, hydrogen compressor 16 is communicated with hydrogen storage tank 17, first temperature measuring part 18 is communicated on second pipeline 11;Hydrogen pressure regulating valve 24 and hydrogen flow meter 15 are sequentially communicated on the pipeline between hydrogen cooler 25 and hydrogen compressor 16.
[0022] Specifically, the wind power generation system provides power for the SOEC stack 7 pressure transmitter 8 and the steam heat regulator 6, high-temperature steam is drawn from the plant steam supply part 1, the pressure is reduced to the working pressure of the SOEC stack 7 through the steam regulating part 2, that is, the flow is adjusted through the steam flow regulating valve 4 of the steam regulating part 2, and then the steam flow is metered through the steam flow meter 5 of the steam regulating part 2. The ratio of the steam flow metering value to the hydrogen flow meter 15 value is compared. If the ratio of the hydrogen flow meter 15 value to the steam flow meter 5 value is between the electrolysis efficiency of the SOEC stack 7, the steam flow regulating valve 4 is not adjusted, and if it is lower than the current efficiency, the steam flow regulating valve 4 is adjusted to reduce the flow supply. The adjusted high-temperature steam is connected to the steam heat regulator 6 of the steam regulating part 2 through the high-temperature pipeline, and the steam temperature is adjusted according to the hydrogen outlet temperature of the SOEC stack 7 fed back by the subsequent first temperature measuring part 18 to make the temperature reach the working temperature of the SOEC stack 7. Specifically, if the hydrogen outlet temperature of the SOEC stack 7 is lower than the set working condition value, the temperature of the steam heat regulator 6 is increased to increase the inlet steam temperature, and if it is higher than the set value, the temperature of the steam heat regulator 6 is decreased. The adjusted steam is then introduced into the steam port of each SOEC stack 7 through the high-temperature pipeline and then enters the electrolytic cell at each point in the SOEC stack 7. Under the action of the current, hydrogen is generated by electrolysis. The mixed gas of hydrogen and water vapor is cooled by the compressed air secondary preheater 12, then cooled to room temperature by the hydrogen cooler 25, and then pressurized by the hydrogen compressor 16 and stored in the storage tank for subsequent synthesis of green ammonia and other hydrogen uses in the power plant. The condensed water produced by the hydrogen cooler 25 is discharged through the gas-water separator 14. On the other side, the air is compressed to the working pressure of the SOEC stack 7 by the air compressor 13, preheated by the compressed air primary and secondary preheaters, and then introduced into the SOEC stack 7 through the third pipeline 19. The oxygen generated by electrolysis is taken out of the stack, and then cooled by the compressed air primary preheater 10. It can be delivered to the next gas-consuming link, such as mixed into the boiler combustion air for oxygen-enriched combustion, or used for the oxidation of sulfite in the desulfurization section.
[0023] In a possible use scenario, the wind and solar power generation system provides power for the SOEC stack 7 and the steam heat regulator 6, high-temperature steam above 500-550°C is drawn from the plant steam supply 1, reduced in pressure by the steam pressure reducing valve 3 to the SOEC stack 7 working pressure 4 MPa, and the flow rate is adjusted by the steam flow rate adjusting valve 4, then the steam flow rate is measured by the steam flow meter 5, the measured flow rate value is compared with the value of the subsequent hydrogen flow meter 15, if the ratio of the value of the hydrogen flow meter 15 to the value of the steam flow meter 5 is between the SOEC stack 7 electrolysis efficiency (85%-100%), the steam flow rate adjusting valve 4 is not adjusted, if it is lower than the current efficiency, the steam flow rate adjusting valve 4 is adjusted to reduce the flow rate. The adjusted high-temperature steam is connected to the steam heat regulator 6 through the high-temperature pipeline, and the steam temperature is adjusted according to whether the hydrogen outlet temperature of the SOEC stack 7 fed back by the first temperature measuring part 18 is between the working temperature 650-850°C of the SOEC stack 7, specifically, if the hydrogen outlet temperature of the SOEC stack 7 is lower than the set 650°C, the set temperature of the steam heat regulator 6 is increased to increase the inlet steam temperature, if it is higher than 850°C, the set temperature of the steam heat regulator 6 is decreased. The adjusted steam is introduced into the steam port of each SOEC stack 7 through the high-temperature pipeline, and then enters each electrolysis cell in the stack, under the action of the current, hydrogen is generated by electrolysis, and the mixed gas of hydrogen and water vapor is adjusted by the hydrogen pressure adjusting valve 24 and then transported to the compressed air secondary preheater 12. The hydrogen pressure adjusting valve 24 is provided with a pressure transmitter 8 before the valve, which mainly measures the internal pressure of the SOEC stack 7, if the pressure is higher than the working pressure 4 MPa, the hydrogen pressure adjusting valve 24 is adjusted to release pressure, otherwise, the pressure is increased, so as to stabilize the system pressure. The stabilized mixed gas is cooled by the compressed air secondary preheater 12, then cooled to room temperature by the hydrogen cooler 25, dehydrated, and then pressurized by the hydrogen compressor 16 and stored in the hydrogen storage tank 17, so as to be used for subsequent synthesis of green ammonia and other hydrogen use places in the power plant. In this embodiment, the hydrogen cooler 25 is designed as a multi-stage cooler, and the condensed water generated by the hydrogen cooler 25 is discharged through the gas-water separator 14. On the other side, the air is compressed to the working pressure 4 MPa of the SOEC stack 7 by the air compressor 13, then preheated by the compressed air primary and secondary preheaters, introduced into the SOEC stack 7, and the oxygen generated by electrolysis is taken out of the stack, then cooled by the compressed air primary preheater 10, and then transported to the next gas use link, such as mixed into the boiler combustion air for oxygen-enriched combustion, or used for oxidation of sulfite in the desulfurization link.
[0024] It can be understood that the air compressor 13 includes but is not limited to screw, diaphragm, piston and other compressors; the preheater and the cooler include but are not limited to tube heat exchanger, plate heat exchanger and other heat exchangers.
[0025] In an embodiment, in order to fully exert the advantages of SOEC (solid oxide) electrolysis hydrogen production technology itself in wide range adjustment and low energy consumption, without being equipped with energy storage, it can be coupled with fluctuating energy such as wind and light, and high safety, low energy consumption and hydrogen production with immediate stop and start can be achieved, and the wind and light power generation part 20 is electrically connected with the SOEC stack 7, and the wind and light power generation part 20 is also electrically connected with the steam heat regulator 6.
[0026] It can be understood that the wind and light power generation part 20 includes but is not limited to photovoltaic power generation, wind power generation, geothermal power generation and other renewable energy power generation.
[0027] In an embodiment, the pipeline between the compressed air primary preheater 10 and the desulfurization part 21 is also communicated with the oxygen pressure regulating valve 23, and high-purity green hydrogen can be efficiently and stably produced, which can be used not only for rotor cooling of a power plant generator, but also for synthesis of green ammonia for denitration, desulfurization and ammonia-doped combustion to effectively help energy saving and emission reduction of the power plant.
[0028] In an embodiment, in order to better monitor the pressure of the mixed steam, the SOEC stack 7 is provided with 20.
[0029] In an embodiment, in order to better adjust the steam flow, the steam supply part 1 includes the steam flow regulating valve 4.
[0030] It can be understood that the steam supplied by the steam supply part 1 includes but is not limited to high-temperature and high-pressure steam, supercritical steam, sub-supercritical steam, ultrahigh-pressure steam and the like generated by a boiler.
[0031] In an embodiment, in order to better adjust the temperature of the steam, the steam regulating part 2 includes the steam pressure reducing valve 3, the steam flow regulating valve 4, the steam flow meter 5 and the steam heat regulator 6 which are communicated in sequence.
[0032] In an embodiment, in order to more accurately detect the temperature, the first temperature measuring part 18 includes a thermometer.
[0033] Finally, it should be explained that the above embodiments are only used to illustrate the technical solutions of the utility model and are not limited, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the utility model, and all of them should be covered in the scope of the claims of the utility model.
Claims
1. A low energy consumption plant hydrogen production system, characterized in that, The system comprises a steam supply part, a steam regulating part, a SOEC stack and a pressure transmitter connected in sequence, the SOEC stack is connected with a compressed air primary preheater through a first pipeline, the other side of the compressed air primary preheater is connected with a desulfurization part and a combustion part, the SOEC stack is also connected with a compressed air secondary preheater through a second pipeline, the compressed air primary preheater is connected with an air compressor, the compressed air primary preheater is also connected with the compressed air secondary preheater, the compressed air secondary preheater is connected with the SOEC stack through a third pipeline, the compressed air secondary preheater is connected with a hydrogen cooler, the hydrogen cooler is connected with a hydrogen compressor, the hydrogen compressor is connected with a hydrogen storage tank, and a first temperature measuring part is connected with the second pipeline; a hydrogen pressure regulating valve and a hydrogen flow meter are connected with the pipeline between the hydrogen cooler and the hydrogen compressor in sequence.
2. The low energy consumption auto-start-stop type green hydrogen production system for thermal power plant according to claim 1, characterized in that, The system also comprises a wind and light power generation part, the wind and light power generation part is electrically connected with the SOEC stack, and the wind and light power generation part is also electrically connected with a steam heat regulator.
3. The low energy consumption auto-start-stop type green hydrogen production system for thermal power plant according to claim 1, characterized in that, An oxygen pressure regulating valve is also connected with the pipeline between the compressed air primary preheater and the desulfurization part.
4. The low-energy start-stop green hydrogen system for thermal power plants according to claim 1, characterized in that, The SOEC stack is provided with at least 15.
5. The low energy consumption auto-start-stop type green hydrogen production system for thermal power plant according to claim 1, characterized in that, The steam supply part comprises a steam flow regulating valve.
6. The low-energy start-stop green hydrogen production system for a thermal power plant according to claim 1, characterized in that, The steam regulating part comprises a steam pressure reducing valve, a steam flow regulating valve, a steam flow meter and a steam heat regulator connected in sequence.
7. The low-energy start-stop green hydrogen production system for a thermal power plant according to claim 1, characterized in that, The first temperature measuring part comprises a thermometer.