Application Case of Micro Gas Pump in Hydrogen Oxygen Fuel Cell

Background introduction

With the increase of population and the rapid development of industry, human beings’ demand for energy is increasing. As a clean and efficient new energy, hydrogen energy has attracted more and more people’s attention. People have accelerated the development of hydrogen energy, making the application of hydrogen energy gradually possible. The most common applications of hydrogen energy are nickel-metal hydride batteries, hydrogen-oxygen fuel cells and hydrogen energy vehicles. This article mainly analyzes and introduces the application of fuel cells.

Application introduction

1.Hydrogen-oxygen fuel cell principle

A hydrogen-oxygen fuel cell is a device that uses hydrogen as fuel and oxygen as oxidant to convert chemical energy into electrical energy through the combustion reaction of the fuel. When the hydrogen-oxygen fuel cell works, it supplies hydrogen as fuel to the negative electrode and oxygen as oxidant to the positive electrode. Hydrogen is decomposed into positive ions H+ and electrons e- under the action of the catalyst on the negative electrode. Hydrogen ions enter the electrolyte, while electrons move along the external circuit toward the positive electrode.

The electrical load is connected to the external circuit. On the positive electrode, oxygen and hydrogen ions in the electrolyte absorb electrons arriving at the positive electrode to form water. This is the reverse process of the electrolysis reaction of water. Negative electrode: The fuel H2 undergoes an oxidation reaction and releases electrons, reaction formula: H2=2H+2e Positive electrode: The released electrons reach the positive electrode through the external circuit, and O2 undergoes a reduction reaction, reaction formula: O2+e+H=H2O Total reaction: that is, usually The oxidation reaction of hydrogen, the total reaction formula: 2H2+O2=2H2O

2.Schematic diagram of hydrogen-oxygen fuel cell structure

3.Introduction to the application of micro gas pump

(1) Micro gas pumps can be used for the hydrogen supply cycle of fuel cells. Since the air pressure directly output from the hydrogen bottle is too high and can easily damage the battery, a pressure reducing valve can be used to reduce the pressure of the gas discharged from the cylinder, and then circulated through a micro gas pump;

(2) Micro gas pumps can also be used for oxygen (or air) supply circulation of fuel cells.

Application Difficulties

1. Since hydrogen is a flammable and explosive gas, the micro gas pump needs to have good air tightness and contact material insulation properties;

2. The pressure of the hydrogen cylinder is relatively high, and the hydrogen pressure after decompression through the pressure reducing valve is about 100kpa. The micro gas pump needs to have a large output pressure and be able to maintain high parameter consistency under long-term fatigue work;

3. Hydrogen circulation and oxygen supply are continuous processes, which require the micro gas pump to be in a long-term working state and have high requirements on the life of the pump;

4. The micro gas pump needs to be able to remotely start and stop, adjust flow and provide online feedback on the pump’s operation.

Product Solution

1.D50 micro gas pumps compressor

Brief description: DC brushless motor, power supply voltage DC24V, wetted material: reinforced nylon and EPDM rubber, multiple speed controls (touch, voltage, frequency and 485 communication), output pressure (relative pressure) 85kPa~120kPa, air Average load flow: 6.8/min~15L/min (soap film flow meter test data), and the inlet and outlet can carry large loads. Advantages: long life (the continuous working life of the premium version can reach more than 9500 hours), large pressure and flow, and multi-functional speed control.

2.D35 micro gas pumps compressor

Brief description: DC brushless motor, power supply voltage DC24V, wetted material: reinforced nylon and EPDM rubber, multiple speed adjustment versions (knob, frequency and touch speed adjustment type), output pressure (relative pressure) 40kPa~130kPa, No-load average flow rate: 2.4/min~5L/min (soap film flowmeter test data), and the exhaust and exhaust ports can carry large loads. Advantages: multi-functional speed control, long life (the maximum load continuous working life of the premium version can reach more than 10,000 hours), compatible with corrosive and complex media, low noise, modular connectors, etc.