The control method adopted by the stepless adjustment on-site gas production system

Abstract

The invention relates to a control method adopted by a stepless regulation on-site gas-preparation system. The control method adopted by the stepless regulation on-site gas-preparation system is used for controlling a gas-preparation process of the stepless regulation on-site gas-preparation system comprising a control system, a frequency conversion power machine, a plurality of absorption towers, a connecting pipeline, a plurality of valves and a monitoring instrument, wherein the frequency conversion power machine, the absorption towers, the connecting pipeline, the valves and the monitoring instrument work under the control of the control system. The control method comprises the steps that a flowmeter detects the actual flow of product gas; when the actual flow of the product gas is smaller than a rated flow of the product gas and is bigger than a set first gas using amount value, and the absorption time of the absorption towers is regulated; when the actual flow of product gas is smaller than or equal to the first gas using amount value and bigger than a set second gas using amount value, the input frequency of the frequency conversion power machine is regulated at first, and then the absorption time of the absorption towers is regulated. The control method adopted by the stepless regulation on-site gas-preparation system controls the gas-preparation process according to the actual flow of the product gas, so that the stepless regulation on-site gas-preparation system can adjust the absorption time of the absorption towers or the input frequency of the frequency conversion power machine to lower energy consumption, and therefore the purpose of saving energy is achieved.

Description

technical field [0001] The invention relates to a control method adopted by an on-site gas production system. Background technique [0002] Pressure swing adsorption nitrogen and oxygen production, as a mature on-site gas production technology, has been mature and well applied in many industries. It mainly includes a set of power machinery (compressor, blower, etc.) that provides raw air, at least two adsorption towers filled with adsorbents, a set of program-controlled automatic switching valves, and a set of monitoring instruments and accessories. Through the program setting, the timing switch of the valve is automatically switched to realize the adsorption and analysis process of the two adsorption towers at the same time, so as to achieve the purpose of continuous gas production. [0003] Usually, each adsorption tower has to go through at least five steps of pressure charging, adsorption (gas production), pressure equalization, degassing and flushing. The key step to d...

AI Technical Summary

Problems solved by technology

When the gas consumption is at its peak, the gas production device must run at full capacity, and when the gas consumption decreases, the switching program and power machinery are still running normally, and the unit energy consumption will rise sharply, resulting in waste of energy consumption

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