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Views: 0 Author: Site Editor Publish Time: 2022-12-23 Origin: Site
Recently, HuaDe Hydrogen’s 5kWe pure hydrogen fuel cell cogeneration system (Model No. CarNeu-5) was successfully developed. It will be delivered to the northwest of China and applied for a project including PV, water hydrogen production - hydro-hydrogenation - power generation - heating integration project. The physical product diagram is shown in Figure 1.
Figure 1 Real Taken Photo of CarNeu-5
CarNeu-5 system is a pure hydrogen fuel cell heat & power cogeneration equipment. Through electrochemical reaction, hydrogen(H2) reacts with air(O2) to generate direct current, which is further inverted to be alternating current and sent to the grid for users. Waste heat during system working is recovered and supplied to users in the form of hot water. The generated power of the whole system is 5000W, 380VAC, three-phase, on-grid. The thermal power of this system is > 4500W, supporting output 50-60℃ hot water. The rated net power generation efficiency of the whole system is > 47% and the highest net power generation efficiency is > 53%. The system adopts the classic shape design. Compared with the H2ES-5 with natural gas reformer, the volume of CarNeu-5 is reduced by nearly 1/2. The detailed system parameters are shown in Table 1.
Table 1 System parameters
No. | Item | Parameters | Unit |
1 | Model No. | CarNeu-5 | - |
2 | Rated electrical power | 5000 | % |
3 | Rated thermal power | ＞4500 | % |
4 | Power efficiency at rated power point | ＞47 | % |
5 | Highest power efficiency | ＞53 | % |
6 | Overall efficiency at rated power point | ＞92 | % |
7 | H2 consumption at rated power | 55 | Nl/min |
8 | Output hot-water temp. | 50-60 | ℃ |
9 | Operation pressure of fuel cell stack | 8-15 | kPa |
10 | Output voltage | 380 | V |
11 | Cold starting temp. | -20 | ℃ |
12 | Protection grade | IP42 | - |
13 | Dimensions(W*D*H) | 749*877*1665 | mm*mm*mm |
CarNeu-5 pure hydrogen fuel cell cogeneration system follows GB/T 27748 series standards, are is designed and used following technologies:
l Special fuel cell stack of low-pressure power generation
The CarNeu-5 system uses a low-pressure low-temperature proton exchange membrane fuel cell stack. Different from vehicle fuel cell stack, this stack adopts enhanced proton exchange membrane and optimized membrane electrode, which effectively reduces the speed of membrane degradation and the loss of catalyst, greatly extends the service life of the stack, and meets the life requirements of long time power generation conditions. In addition, the catalyst of the membrane electrode is designed to resist the CO poisoning shock of 0-10ppm for a long time, and the voltage is stable, which improves the redundancy of the system under the power generation condition. In addition, the stack can work with mixed gas, such as 75% hydrogen and 25% carbon dioxide mixture.
Figure 2 CO resistance test curve of the stack
l Small flow hydrogen cycle process
Hydrogen cycling unit specially developed for small flow hydrogen cycling is integrated in CarNeu-5 system. The optimized cycling algorithm can effectively improve the utilization rate of hydrogen (avoid dangerous direct row or direct row after oxidation) and improve the efficiency of power generation. The circulating device is designed with low power consumption, which also effectively reduces the impact on the net power generation and efficiency of the system. The highest measured power generation efficiency can reach 53.7%, and the overall system efficiency is more than 90%. The efficiency rate of the whole machine is shown in Figure 3.
Figure 3 Power generation watts and efficiency curve
l High safety design
CarNeu-5 system adopts PLC control. Multiple safety chains are designed, multiple hydrogen detectors and smoke detectors are integrated in the internal and external environment of the fuel cell, and a number of safety response functions are set in the program. When abnormal operating conditions such as over-temperature, over-pressure, and low pressure occur inside the system, or abnormal conditions such as leakage and fire occur outside the system, the system will carry out warning and automatically stop when necessary to ensure the safety of system operation. In addition, the fuel cell stack adopts low-pressure design. The operation pressure is only 8-14kpa, which reduces the pressure of the pipeline and the stack, greatly improves the safety of the fuel cell stack, and minimizes the risk of hydrogen leakage.
l Cold start design
CarNeu-5 system is designed with a cold start unit, which can realize fast start under -20℃. This improves the adaptability of the product used in cold regions such as the north of China.
l Modular Design
CarNeu-5 system adopts modular design concept. The whole system is composed of four modules: fuel cell module, control module, electric & electronic module and thermal management module, which can easily realize parallel operation. The whole system is compact, simple and easy to maintain. The system is plug and play and has no special requirements for the installation environment. In addition, the enclosure adopts a sealed design, and the whole cabinet is micro negative pressure, which can be installed in a closed environment such as the basement, safe and stable.
l Convenient operation
CarNeu-5 system adopts intelligent control design, which can realize one-button startup and one-button shutdown. The operation is very convenient and friendly, without professional theoretical knowledge reserve. The touch screen operation is shown in Figure 4, and the main operation interface is shown in Figure 5. The parameters of the system during the operation of the whole machine can be displayed through the intelligent screen, and the temperature curve, pressure curve, single fuel cell voltage and other parameters of the system can be viewed at any time. The operating parameters are shown in Figure 6. The temperature interface is shown in Figure 7. The pressure curve is shown in Figure 8, and the single fuel cell’s voltage is shown in Figure 9. Moreover, the system supports the power modulation mode. Users can adjust the power of the fuel cell system according to their individual needs. The system will work in a 24h cycle according to the parameter curve set by the user, and the time-sharing operation parameters are shown in Figure 10.
Figure 4 Touch screen operation
Figure 5 Main operation interface
Figure 6 Operation parameter interface
Figure 7 Temperature curve interface
Figure 8 Pressure curve interface
Figure 9 Single fuel cell's voltage
Figure 10 Time-sharing operation parameter setting interface
For a long time, HuaDe Hydrogen takes the natural-gas-reformed hydrogen fuel cell cogeneration system for residential use as the main line. HuaDe Hydrogen fully considers the difficulty of obtaining hydrogen in distributed scenarios, and provides users with an integrated solution for local hydrogen production and hydrogen use (H2ES-5). While, this delivery of pure hydrogen product CarNeu-5 is the company's first attempt to transform from 'gray hydrogen use' to 'green hydrogen use'. The successful development of CarNeu-5 system further strengthens the independent control of the company's core technologies in the integration of modular small-power fuel cell cogeneration system, high-performance low-voltage power generation fuel cell stack and distributed energy management system.
In the next step, the company will continue to adhere to the dual strategy of 'gray hydrogen' and 'green hydrogen', and provide customers with flexible and convenient hydrogen energy storage, hydrogen power generation or hydrogen cogeneration system solutions with high scene adaptability.
