Wind-solar fuel gas heat storage hydrogen production system based on elemental sulfur

Abstract

The utility model provides a wind-light fuel gas heat storage hydrogen production system based on elemental sulfur, which comprises a wind-light power generation unit used for collecting wind energy and solar energy, converting the wind energy and the solar energy into electric energy and transmitting the electric energy; the electric heater is connected with the wind-solar power generation unit so as to convert electric energy into heat energy; the heat storage unit comprises an elemental sulfur high-temperature storage tank and an elemental sulfur low-temperature storage tank; the water electrolysis hydrogen production unit is used for electrolyzing water to produce hydrogen; the heat exchanger comprises a first side which exchanges heat and is connected with the heat storage unit and a second side which is connected with the water electrolysis hydrogen production unit; the first sulfur circulating pump and the second sulfur circulating pump are used for providing circulating power for elemental sulfur; and the elemental sulfur high-temperature storage tank, the first sulfur circulating pump, the first side of the heat exchanger, the elemental sulfur low-temperature storage tank, the second circulating pump and the electric heater are sequentially connected to form an acting loop of elemental sulfur. According to the utility model, the utilization efficiency of energy can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of energy, especially relates to a wind and solar gas heat storage hydrogen production system based on single sulfur. BACKGROUND

[0002] Wind and solar power hydrogen production has significant environmental advantages compared to traditional fossil fuel hydrogen production. In this process, the use of wind energy and solar energy does not produce pollution at all, and carbon emissions can be greatly reduced, which makes wind and solar hydrogen production an important driving force for the supply side of the hydrogen energy industry. With the advent of the low-carbon era, wind and solar hydrogen production is expected to become the main source of hydrogen production in the future. Hydrogen is a key raw material in the petrochemical industry. Currently, most of the hydrogen used in the petrochemical industry in China is derived from fossil fuels, which results in a large amount of carbon emissions. By using large-scale renewable energy to electrolyze water to produce hydrogen, a large amount of green hydrogen can be provided for the petrochemical industry, thereby promoting the development of green chemical industry, which is of great significance for promoting the use of renewable energy and achieving the carbon emission reduction target of the petrochemical industry.

[0003] Therefore, it is necessary to find a new wind and solar gas heat storage hydrogen production system based on single sulfur to improve the utilization efficiency of energy. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to provide a new wind and solar gas heat storage hydrogen production system based on single sulfur to improve the utilization efficiency of energy.

[0005] The technical solution adopted by the utility model to solve its technical problem is: a wind and solar gas heat storage hydrogen production system based on single sulfur is provided, which comprises:

[0006] A wind and solar power unit is used to collect wind energy and solar energy, convert wind energy and solar energy into electrical energy, and deliver electrical energy.

[0007] An electric heater is connected to the wind and solar power unit to convert electrical energy into thermal energy.

[0008] A heat storage unit comprises a single sulfur high-temperature storage tank and a single sulfur low-temperature storage tank.

[0009] A water electrolysis hydrogen production unit is used to electrolyze water to produce hydrogen.

[0010] A heat exchanger comprises a first side connected to the heat storage unit and a second side connected to the water electrolysis hydrogen production unit for heat exchange.

[0011] A first sulfur circulating pump and a second sulfur circulating pump are used to provide circulating power for single sulfur.

[0012] The elemental sulfur high-temperature storage tank, the first sulfur circulating pump, the first side of the heat exchanger, the elemental sulfur low-temperature storage tank, the second sulfur circulating pump and the electric heater are sequentially connected to form a working loop of elemental sulfur.

[0013] In an embodiment, the water electrolysis unit for producing hydrogen comprises a steam turbine, a generator and an electrolytic cell, and the heat exchanger other side, the steam turbine, the generator and the electrolytic cell are sequentially connected to form a water electrolysis unit for producing hydrogen.

[0014] In an embodiment, the working medium of the second side of the heat exchanger is water, and steam is generated after heat exchange to drive the steam turbine to work.

[0015] In an embodiment, the system further comprises a gas turbine heat supplement unit connected to the elemental sulfur high-temperature storage tank to supplement heat.

[0016] In an embodiment, the working temperature range of the elemental sulfur high-temperature storage tank is 180-250 DEG C.

[0017] In an embodiment, the working temperature range of the elemental sulfur low-temperature storage tank is 115-150 DEG C.

[0018] In an embodiment, the heat exchanger is of a shell-and-tube structure, and the inner wall of the heat exchanger is coated with ceramic.

[0019] In an embodiment, the elemental sulfur high-temperature storage tank and the elemental sulfur low-temperature storage tank are made of aluminum silicate fiber insulation material, and the outer layer of the elemental sulfur high-temperature storage tank and the elemental sulfur low-temperature storage tank is a metal protective shell, and the inner part is a vacuum insulation layer or a composite insulation layer.

[0020] In an embodiment, the electric heater is an immersed electric heater, and the inner wall of the electric heater is coated with ceramic.

[0021] In an embodiment, the first sulfur circulating pump and the second sulfur circulating pump are high-temperature melting pumps, and the inner wall of the first sulfur circulating pump and the second sulfur circulating pump is coated with ceramic.

[0022] The utility model discloses the following beneficial effects: the utility model discloses a elemental sulfur high-temperature storage tank, a first sulfur circulating pump, a heat exchanger first side, a elemental sulfur low-temperature storage tank, a second sulfur circulating pump and an electric heater are sequentially connected to form a working loop of elemental sulfur, and the elemental sulfur is stored heat to reduce heat energy loss and improve energy utilization. BRIEF DESCRIPTION OF DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the wind, solar and gas thermal storage hydrogen production system based on elemental sulfur of this utility model. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please refer to Figure 1 As shown, this utility model provides a wind-solar-gas thermal energy storage hydrogen production system based on elemental sulfur, comprising:

[0027] The wind and solar power generation unit 01 is used to collect wind and solar energy, convert wind and solar energy into electrical energy, and transmit electrical energy.

[0028] An electric heater 30 is connected to the wind and solar power generation unit 01 to convert electrical energy into heat energy;

[0029] Thermal storage unit 02 includes a high-temperature storage tank 60 for elemental sulfur and a low-temperature storage tank 50 for elemental sulfur;

[0030] Water electrolysis hydrogen production unit 03 is used for water electrolysis to produce hydrogen;

[0031] The heat exchanger 90 includes a first side that performs heat exchange and is connected to the heat storage unit 02, and a second side that is connected to the water electrolysis hydrogen production unit 03.

[0032] The first sulfur circulation pump 80 and the second sulfur circulation pump 40 are used to provide the circulation power for elemental sulfur.

[0033] A high-temperature storage tank 60 for elemental sulfur, a first sulfur circulation pump 80, a heat exchanger 90 on the first side, a low-temperature storage tank 50 for elemental sulfur, a second sulfur circulation pump 40, and an electric heater 30 are connected in sequence to form a working circuit for elemental sulfur.

[0034] In one embodiment, the wind and solar power generation unit 01 includes a 50MW photovoltaic panel 10 and a 100MW wind turbine generator set 20 arranged in parallel. The photovoltaic panel 10 converts solar energy into electrical energy, and the wind turbine generator set 20 converts wind energy into electrical energy. The wind and solar power generation unit 01 is connected to an electric heater 30 to provide electrical energy to the electric heater 30.

[0035] In one embodiment, the system further includes a gas turbine heat supply unit, which includes a gas turbine 70 connected to a high-temperature elemental sulfur storage tank 60 to supplement heat. It should be noted that the gas turbine 70 generates electricity using natural gas or other fuels, and can transfer waste heat to the high-temperature elemental sulfur storage tank 60, ensuring that the heat storage unit 02 can still be heated even when the wind and solar power generation unit 01 generates insufficient power, thus guaranteeing the continuous operation of the system.

[0036] In one embodiment, the heat exchanger 90 has a shell-and-tube structure, and the inner wall of the tube is coated with a ceramic coating to prevent corrosion of the inner wall by elemental sulfur.

[0037] In one embodiment, the water electrolysis hydrogen production unit 03 includes a steam turbine 100, a generator 110, and an electrolyzer 120. The other side of the heat exchanger 90, the steam turbine 100, the generator 110, and the electrolyzer 120 are sequentially connected to form the water electrolysis hydrogen production unit 03. Furthermore, the working medium on the second side of the heat exchanger is water. After heat exchange, steam is generated to drive the steam turbine 100 to perform work. Specifically, the steam generated on the second side of the heat exchanger 90 drives the steam turbine 100 to perform work, which in turn drives the generator 110 to generate electricity, thereby converting kinetic energy into electrical energy. The electrical energy generated by the generator 110 supplies power to the electrolyzer 120, enabling the electrolyzer 120 to electrolyze water and produce hydrogen.

[0038] The high-temperature storage tank 60 and the low-temperature storage tank 50 for elemental sulfur are used to store elemental sulfur, thereby storing heat. In one embodiment, the operating temperature range of the high-temperature storage tank 60 is 180°C to 250°C, and the operating temperature range of the low-temperature storage tank 50 is 115°C to 150°C. Furthermore, both the high-temperature storage tank 60 and the low-temperature storage tank 50 are insulated with aluminum silicate fiber, and their outer layers are metal protective shells, while their inner layers are vacuum insulation layers or composite insulation layers. It should be noted that the melting point of elemental sulfur is approximately 115℃. The elemental sulfur in the high-temperature storage tank 60 serves as the main heat source for the system, while the elemental sulfur in the low-temperature storage tank 50 serves as a supplementary heat source. Therefore, the operating temperature range of the high-temperature storage tank 60 is higher than that of the low-temperature storage tank 50. In addition, during system operation, the tanks inevitably lose heat, so the tanks need to be made of insulating materials and have an insulating structure.

[0039] The electric heater 30 is used to receive electrical energy transmitted by the wind and solar power generation unit 01 and to use the electrical energy to power the electric heater 30. In one embodiment, the electric heater 30 is an immersion electric heater and the inner wall of the electric heater 30 is coated with a ceramic coating to avoid elemental sulfur corrosion.

[0040] In one embodiment, both the first sulfur circulation pump 80 and the second sulfur circulation pump 40 are high-temperature molten pumps, and their inner walls are both ceramic coated to prevent elemental sulfur from corroding the inner walls.

[0041] Instructions for connecting system devices or components: Refer to Figure 1 The photovoltaic panels 10 and wind turbine generator 20 of the wind-solar power generation unit 01 are arranged in parallel and connected to the first side of the electric heater 30. The second side of the electric heater 30 is connected to the thermal storage unit 02, specifically, to the first side of the elemental sulfur high-temperature storage tank 60. The second side of the elemental sulfur high-temperature storage tank 60 is connected to the first sulfur circulation pump 80. The gas turbine 70 is connected to the third side of the elemental sulfur high-temperature storage tank 60. The second side of the first sulfur circulation pump 80 is connected to the heat exchanger 90. The second side of the heat exchanger 90 is connected to the first side of the elemental sulfur low-temperature storage tank 50. The second side of the elemental sulfur low-temperature storage tank 50 is connected to the first side of the second sulfur circulation pump 40. The second side of the second sulfur circulation pump 40 is connected to the third side of the electric heater 30. The third side of the heat exchanger 90 is connected to the water electrolysis hydrogen production unit 03. Specifically, the third side of the heat exchanger 90 is connected to the first side of the steam turbine 100. The second side of the steam turbine 100 is connected to the first side of the generator 110. The second side of the generator 110 is connected to one side of the electrolyzer 120.

[0042] The working principle of the system is explained as follows: Photovoltaic panel 10 converts solar energy into electrical energy, and wind turbine generator 20 converts wind energy into electrical energy. The converted electrical energy is transmitted to electric heater 30. Electric heater 30 converts electrical energy into heat energy through resistance heating, and heats elemental sulfur, causing the elemental sulfur to melt into liquid sulfur and store heat. At this time, the temperature of liquid elemental sulfur is between 180℃ and 250℃. The high-temperature liquid sulfur is transported to high-temperature storage tank 60 for storage through corrosion-resistant pipelines. Alternatively, a third sulfur circulation pump can be installed between electric heater 30 and high-temperature storage tank 60 to transport the liquid sulfur heated by electric heater 30 to high-temperature storage tank 60. In addition, a gas-fired auxiliary heater can be used in this system to replace electric heater 30. The high-temperature elemental sulfur stored in the elemental sulfur high-temperature storage tank 60 is extracted by the first sulfur circulation pump 80 and transported to the heat exchanger 90 through pipelines. The elemental sulfur transfers heat energy to the water on the shell side of the heat exchanger 90 on the tube side, causing the water to evaporate into steam. The steam causes the steam turbine 100 to drive the generator 110 to do work. The generator 110 generates electrical energy and transmits it to the electrolyzer, which then electrolyzes water to produce hydrogen. In addition, during the process of heat exchanger 90 transferring the heat energy of elemental sulfur to water, causing the water to evaporate into steam, some of the heat energy of elemental sulfur will drop to a lower temperature. After the heat exchange is completed, this low-temperature elemental sulfur is sent to the low-temperature storage tank 50 of elemental sulfur through a circulation pipeline. At this time, the elemental sulfur in the high-temperature storage tank 60 of elemental sulfur will also be drawn out by the first sulfur circulation pump 80 to replenish the heat exchanger 90 to maintain the heat balance. In addition, a fourth sulfur circulation pump can be set between the low-temperature storage tank 50 of elemental sulfur and the heat exchanger 90. The fourth sulfur circulation pump will draw out the low-temperature elemental sulfur in the heat exchanger 90 and transport it to the low-temperature storage tank 50 of elemental sulfur through a pipeline. Furthermore, the inner wall of all sulfur circulation pumps in this invention is coated with ceramic to avoid sulfur corrosion. The elemental sulfur in the cryogenic storage tank 50 is maintained above 115°C to prevent solidification. Liquid sulfur in the cryogenic storage tank 50 is extracted by the second sulfur circulation pump 40 and transported through pipelines to the electric heater 30. After being heated to the operating temperature of the high-temperature storage tank 60, it is transported back through pipelines to replenish the heat energy in the high-temperature storage tank 60. This cyclic heating and storage method achieves high efficiency and sustainability in the heat conversion, recovery, and reuse of elemental sulfur, improving energy utilization. Additionally, when the wind and solar power generation unit 01 generates insufficient power, the gas turbine 70 can supplement the heat. The gas turbine 70 is connected to the high-temperature storage tank 60 to ensure continuous system operation.

[0043] In addition, an online monitoring system can be added to the system of this utility model to monitor the temperature, pressure and corrosion of equipment such as pipelines, storage tanks, electric heaters 30 and heat exchangers 90 in real time, so as to facilitate regular maintenance and replacement of vulnerable parts.

[0044] This invention effectively reduces heat loss by using elemental sulfur, which has a low melting point and high heat storage density, as the thermal energy storage medium. The thermal storage unit 02 incorporates a high-temperature elemental sulfur storage tank 60 and a low-temperature elemental sulfur storage tank 50 to circulate thermal energy and improve storage efficiency. A gas turbine supplementary heating unit is introduced to ensure stable system operation when wind and solar energy are insufficient. By using a resistance heater instead of the traditional high-temperature molten salt heating method, and supplementing with waste heat from the gas turbine 70, the overall operating cost of the system is reduced. An online monitoring system is introduced to monitor the equipment in real time to ensure stable system operation.

[0045] Finally, it should be noted that the steps in the method of this utility model embodiment can be adjusted, combined, or deleted according to actual needs.

[0046] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the present utility model.

Claims

1. A wind-solar-gas thermal energy storage hydrogen production system based on elemental sulfur, characterized in that, include: A wind and solar power generation unit is used to collect wind and solar energy, convert wind and solar energy into electrical energy, and transmit electrical energy. An electric heater is connected to the wind and solar power generation unit to convert electrical energy into heat energy; Thermal storage units include high-temperature storage tanks and low-temperature storage tanks for elemental sulfur; A water electrolysis hydrogen production unit is used to produce hydrogen through water electrolysis. A heat exchanger includes a first side connected to the thermal storage unit and a second side connected to the water electrolysis hydrogen production unit for heat exchange. The first sulfur circulation pump and the second sulfur circulation pump are used to provide the circulation power for elemental sulfur. The elemental sulfur high-temperature storage tank, the first sulfur circulation pump, the first side of the heat exchanger, the elemental sulfur low-temperature storage tank, the second sulfur circulation pump, and the electric heater are connected in sequence to form the working circuit of the elemental sulfur.

2. The wind-solar-gas thermal energy storage hydrogen production system based on elemental sulfur as described in claim 1, characterized in that, The water electrolysis hydrogen production unit includes a steam turbine, a generator, and an electrolyzer. The other side of the heat exchanger, the steam turbine, the generator, and the electrolyzer are connected in sequence to form the water electrolysis hydrogen production unit.

3. The wind-solar-gas thermal energy storage hydrogen production system based on elemental sulfur as described in claim 2, characterized in that, The working medium on the second side of the heat exchanger is water, which generates steam after heat exchange to drive the steam turbine to do work.

4. The wind-solar-gas thermal energy storage hydrogen production system based on elemental sulfur as described in claim 1, characterized in that, The system also includes a gas turbine heat supply unit, which is connected to the elemental sulfur high-temperature storage tank to supplement heat.

5. The wind-solar-gas thermal energy storage hydrogen production system based on elemental sulfur as described in claim 1, characterized in that, The operating temperature range of the elemental sulfur high-temperature storage tank is 180℃~250℃.

6. The wind-solar-gas thermal energy storage hydrogen production system based on elemental sulfur as described in claim 1, characterized in that, The operating temperature range of the elemental sulfur cryogenic storage tank is 115℃~150℃.

7. The wind-solar-gas thermal energy storage hydrogen production system based on elemental sulfur as described in claim 1, characterized in that, The heat exchanger has a shell-and-tube structure, and the inner wall of the tubes of the heat exchanger is coated with ceramic.

8. The wind-solar-gas thermal energy storage hydrogen production system based on elemental sulfur as described in claim 1, characterized in that, The high-temperature and low-temperature sulfur storage tanks are made of aluminum silicate fiber insulation material. The outer layer of the high-temperature and low-temperature sulfur storage tanks is a metal protective shell, and the inner layer is a vacuum insulation layer or a composite insulation layer.

9. The wind-solar-gas thermal energy storage hydrogen production system based on elemental sulfur as described in claim 1, characterized in that, The electric heater is an immersion type, and the inner wall of the electric heater is coated with a ceramic coating.

10. The wind-solar-gas thermal energy storage hydrogen production system based on elemental sulfur as described in claim 1, characterized in that, The first sulfur circulation pump and the second sulfur circulation pump are high-temperature melting pumps, and the inner walls of the first sulfur circulation pump and the second sulfur circulation pump are coated with ceramic.

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