1. Principle

The nitrogen and hydrogen proportioning device mainly uses the control of the flow of hydrogenation or nitrogen addition to achieve the purpose of mixing hydrogen and nitrogen in a certain proportion. Under normal circumstances, it is to control the flow of gas with less content. A nitrogen-hydrogen proportioning device is mainly composed of nitrogen flowmeter, hydrogen flowmeter, hydrogen analyzer, PID controller, flow regulating valve, pressure gauge, mixing tank, and chassis And other composition.

Principle: The hydrogen analyzer measures the hydrogen content in the mixing tank. The hydrogen analyzer converts the measured content into a 4-20mA signal and sends it to the PID controller. The PID controller converts this signal into a mechanical signal to the flow control valve. An action command is issued to command the opening of the flow regulating valve. The opening of the flow regulating valve determines the hydrogen content in the mixing tank. During continuous adjustment, the goal of mixing hydrogen and nitrogen in a certain proportion is achieved.

2. Device features

1. Hydrogen analyzer: The high-precision hydrogen analyzer is selected for accurate measurement, high reliability and rapid response. This hydrogen analyzer has a 4-20mA signal output.

2. PID controller: selects the PID controller produced by Japan SHIMANDEN, which has high control accuracy. It can quickly compare the obtained signal with the set value, and quickly issue instructions to ensure the accuracy and precision of the control. At the same time, the rapid reaction can ensure the stability of the hydrogen content.

PID control is mainly based on the difference between the content set value and the actual content value to achieve control. When the actual value is lower than the set value, the PID commands the regulating valve to open a large flow, when the actual value is higher than the set value, the PID commands to adjust the small flow, and so on, it will eventually reach a balance, that is, the set value and the actual value. Unity.

3. Flow control valve: The high-sensitivity control valve is selected, the valve action range is small, and there will be no sudden opening or closing, and it can well control the hydrogen supply volume, so as to ensure the stability of the hydrogen content.

4. The overall box structure of the equipment is convenient for installation and saves space.