An energy-saving system for hydrogen production by solid oxide electrolysis cell (SOEC)

Abstract

The utility model relates to the technical field of electrolytic hydrogen production, and concretely provides an energy-saving system for hydrogen production of solid oxide electrolysis cell SOEC, which comprises a photovoltaic module, a DCAC voltage boosting module, a hot box, a temperature sensing unit, an electric heating element and a PID controller, the photovoltaic module is electrically connected with the electric heating element through the DCAC voltage boosting module, the temperature sensing unit and the PID controller constitute a closed-loop temperature control system, and the inner cavity bottom of the hot box is provided with an electric pile. The utility model replaces traditional power grid power supply by photovoltaic power generation, directly uses the electric energy converted from solar energy to heat the hydrogen production equipment, significantly reduces the comprehensive energy consumption of the hydrogen production process, and realizes the energy consumption reduction and energy saving targets.

Description

Technical Field

[0001] This utility model belongs to the field of electrolytic hydrogen production technology, specifically relating to an energy-saving system for hydrogen production using a solid oxide electrolyzer (SOEC). Background Technology

[0002] Hydrogen production through water electrolysis is gradually becoming a new field. Existing hydrogen production technologies through water electrolysis include high-temperature solid oxide water electrolysis, alkaline water electrolysis, and proton exchange membrane water electrolysis.

[0003] Solid oxide electrolyzer (SOEC) hydrogen production technology has attracted much attention due to its high electrolysis efficiency, but its stack reaction needs to be maintained at a high temperature of 700-850℃. Traditional resistance heating methods suffer from high energy consumption and large heat loss. In existing technologies, the insulation structure of SOEC equipment mostly adopts a single stainless steel shell with a polyurethane foam insulation layer, which has a high thermal conductivity and does not effectively utilize renewable energy sources for power supply. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an energy-saving system for hydrogen production using a solid oxide electrolyzer (SOEC), which achieves high efficiency and energy saving through deep coupling of photovoltaic power generation and thermal management system.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving system for hydrogen production using a solid oxide electrolysis cell (SOEC), comprising a photovoltaic module, a DCAC boost module, a heat box, a temperature sensing unit, an electric heating element, and a PID controller. The photovoltaic module is electrically connected to the electric heating element via the DCAC boost module. The temperature sensing unit and the PID controller constitute a closed-loop temperature control system. An electric stack is provided at the bottom of the inner cavity of the heat box.

[0006] Preferably, the hot box consists of a stainless steel outer wall, an insulation layer, and an air gap, wherein the insulation layer is a ceramic insulation layer.

[0007] Preferably, the PID controller communicates with the host computer, and the PID controller adjusts the heating power of the electric heating element in real time through the temperature sensing unit.

[0008] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model replaces traditional grid power supply with photovoltaic power generation, and uses the electrical energy converted from solar energy directly for heating hydrogen production equipment, which significantly reduces the overall energy consumption of the hydrogen production process and achieves the goals of reducing energy consumption and saving energy.

[0009] 2. This utility model replaces the inner insulation material of the hot box with ordinary ceramic while retaining the outer stainless steel support, which effectively improves the insulation performance of the equipment, reduces heat loss, and achieves the effect of improving the reaction efficiency of the equipment and reducing the heat loss rate.

[0010] 3. This utility model adopts a closed-loop system with real-time temperature sensor monitoring and dynamic voltage regulation by PID controller, which helps to ensure that the working temperature of the fuel cell stack is stably maintained within the optimal reaction range.

[0011] 4. The photovoltaic power generation of this utility model provides clean energy for the entire system, enabling the hydrogen production process to completely break away from the fossil energy dependence of the traditional power grid. The entire hydrogen production process is green energy, and the produced hydrogen is green hydrogen, realizing a green, environmentally friendly, and zero-carbon hydrogen production path.

[0012] 5. The system upgrade of this utility model only requires adding photovoltaic modules to the existing SOEC equipment, replacing the inner layer material of the heat box and configuring a DCAC boost module. The overall solution is simple to implement and reduces the equipment upgrade cost. Attached Figure Description

[0013] Figure 1 This is a diagram of the heating system of this utility model; Figure 2 This is a schematic diagram of the hot box structure of this utility model.

[0014] In the diagram: 1. Photovoltaic module; 2. DCAC boost module; 3. Heat box; 301. Stainless steel outer wall; 302. Insulation layer; 303. Air jacket; 4. Temperature sensing unit; 5. Fuel cell stack; 6. Electric heating element. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0016] The following reference Figures 1-2 This application describes an embodiment of an energy-saving system for hydrogen production using a solid oxide electrolyzer (SOEC).

[0017] An energy-saving system for hydrogen production using a solid oxide electrolyzer (SOEC) includes a photovoltaic module 1, a DCAC boost module 2, a hot box 3, a temperature sensing unit 4, an electric heating element 6, and a PID controller. The photovoltaic module 1 is electrically connected to the electric heating element 6 via the DCAC boost module 2. The temperature sensing unit 4 and the PID controller form a closed-loop temperature control system. An electric stack 5 is installed at the bottom of the inner cavity of the hot box 3.

[0018] Furthermore, the hot box 3 is composed of a stainless steel outer wall 301, an insulation layer 302, and an air gap 303. The insulation layer 302 is a ceramic insulation layer. The thermal conductivity of ordinary ceramics is typically between 1 W / m·K and 2 W / m·K, while the thermal conductivity of stainless steel is 14-19 W / (m·K). Ordinary ceramic boxes have lower heat transfer efficiency than conventional stainless steel boxes or other metal boxes. In terms of insulation, ordinary ceramic boxes are better than conventional stainless steel boxes or other metal boxes, resulting in greater energy savings. Moreover, because ordinary ceramics have a higher density than stainless steel or other metals, they are lighter for the same volume, easier to install, and better able to maintain the system's heat.

[0019] In a further embodiment, the PID controller communicates with the host computer, and the PID controller adjusts the heating power of the electric heating element 6 in real time through the temperature sensing unit 4.

[0020] The specific working process of an energy-saving system for hydrogen production using a solid oxide electrolyzer (SOEC) in accordance with the above embodiments is described below: 1. System startup phase: Solar energy harvesting: Photovoltaic module 1 converts solar energy into DC power under sunlight conditions and outputs it to DCAC boost module 2.

[0021] Power modulation: DCAC boost module 2 boosts the DC power output from the photovoltaic module and modulates it into AC power that is compatible with the operating voltage of the electric heating element 6.

[0022] 2. Heating and temperature control stage: Thermal energy conversion: Modulated electrical energy drives electric heating element 6 to generate heat energy, which heats the air medium inside the hot box 3 through heat conduction.

[0023] Temperature closed-loop control: Temperature sensing unit 4 monitors the temperature of the fuel cell stack area in real time and feeds back the signal to the PID controller. The PID controller dynamically adjusts the output power of DCAC boost module 2 to achieve precise control of heating wire power (increase heating power when the temperature is lower than the set value).

[0024] 3. Thermal Management Stage: Composite insulation mechanism: Replace the insulation material of the hot box, replace the inner stainless steel or other metal material of the SOEC stack box with ordinary ceramic to improve the insulation effect, while the outer layer still uses stainless steel to complete the skeleton support, and the stainless steel 301 outer wall maintains the structural strength of the box.

[0025] 4. Hydrogen production operation phase: Temperature maintenance: When the internal temperature of the hot chamber stabilizes at the temperature required for the SOEC fuel cell reaction, the water electrolysis hydrogen production reaction continues. When photovoltaic power is insufficient (such as at night), the system automatically switches to grid power mode.

[0026] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0027] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An energy-saving system for hydrogen production using a solid oxide electrolyzer (SOEC), characterized in that: The device includes a photovoltaic module (1), a DCAC boost module (2), a heat box (3), a temperature sensing unit (4), an electric heating element (6), and a PID controller. The photovoltaic module (1) is electrically connected to the electric heating element (6) through the DCAC boost module (2). The temperature sensing unit (4) and the PID controller form a closed-loop temperature control system. An electric stack (5) is provided at the bottom of the inner cavity of the heat box (3).

2. The energy-saving system for hydrogen production using a solid oxide electrolyzer (SOEC) according to claim 1, characterized in that: The hot box (3) is composed of a stainless steel outer wall (301), an insulation layer (302) and an air interlayer (303), wherein the insulation layer (302) is a ceramic insulation layer.

3. The energy-saving system for hydrogen production using a solid oxide electrolyzer (SOEC) according to claim 1, characterized in that: The PID controller communicates with the host computer and adjusts the heating power of the electric heating element (6) in real time through the temperature sensing unit (4).

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