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1. Principle

The nitrogen and hydrogen proportioning equipment mainly adopts the control of the flow rate of hydrogenation or nitrogen addition to achieve the purpose of mixing hydrogen and nitrogen in a certain proportion. In general, it is to control the flow of gas with less content. A nitrogen-hydrogen proportioning equipment mainly consists of nitrogen flowmeter, hydrogen flowmeter, hydrogen analyzer, PID controller, flow control valve, pressure gauge, mixing tank, chassis etc. 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 transmits it to the PID controller. The PID controller converts this signal into a mechanical signal to the flow control valve. Send out an action command to direct the opening of the flow control valve. The opening of the flow control valve determines the hydrogen content in the mixing tank. During continuous adjustment, the purpose of mixing hydrogen and nitrogen in a certain proportion is achieved.


2. Product design features

(1) There are sound and light alarm equipments for the upper and lower limits of hydrogen excess.
(2) When the online hydrogen content exceeds the set index, the hydrogenation pipeline will be automatically cut off.
(3) There is a manual hydrogenation pipeline, which is used in special cases to ensure the operation of the whole equipment.
(4) The sound and light alarm equipment with ultra-high pressure and low pressure is designed


3. Equipment composition

1. Hydrogen analyzer: high-precision hydrogen analyzer is selected, with accurate measurement, high stability and rapid response. This hydrogen analyzer has 4～20mA signal output.
2. PID controller: high-quality PID controller is selected, with high control accuracy, which can quickly compare the obtained signal with the set value, and quickly issue commands to ensure the accuracy and precision of the control. At the same time, the fast reaction can ensure the stability of the hydrogen content.
PID control is mainly based on the difference between the set value of the content and the actual value of the content to achieve control. When the actual value is lower than the set value, the PID directs the regulating valve to open the large flow. When the actual value is higher than the set value, the PID directs the adjustment to close the small flow, and so on and so forth, and finally reaches a balance, that is, the set value and the actual value. unity.
3. Flow control valve: high-sensitivity control valve is selected, the valve action range is small, there will be no emergency opening and closing, and the supply of hydrogen can be well controlled to ensure the stability of hydrogen content.

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