Chemical control system with high degree of automation

Chemical control system with high degree of automation

In the chemical control system with high degree of automation, the regulating valve is used as the terminal execution device of the automatic regulating system, and receives the control signal to realize the adjustment of the chemical process. Its motion sensitivity is directly related to the quality of the adjustment system. According to the actual statistics on the site, about 70% of the faults come from the regulating valve. Therefore, in the routine maintenance, the factors affecting the safe operation of the regulating valve and the countermeasures are summarized.

The problem that often occurs in the regulating valve is the jam, which often occurs in the initial stage of the new commissioning system and overhaul. Due to the slag, the rust, etc. in the pipeline, the clogging of the throttle and the guiding part makes the medium flow poorly, or the regulating valve is overhauled. The medium filler is too tight, causing the friction to increase, causing the small signal to not move and the large signal to overshoot.

Trouble-shooting: The sub-line or regulating valve can be quickly opened and closed to allow dirt to be washed away from the secondary line or the regulating valve. Another method is to clamp the valve stem with a pipe wrench. When the signal pressure is applied, the valve stem is rotated forward and backward to allow the spool to flash past the card. If not, increase the air supply pressure and increase the drive power repeatedly to move up and down several times to solve the problem. If it still does not work, it needs to be dismantled.

By analyzing the cause of the failure of the regulating valve and adopting appropriate treatment and improvement methods, the utilization rate of the regulating valve will be greatly improved, the failure rate of the instrument will be reduced, and the production efficiency and economic efficiency of the process and the reduction of energy consumption will play an important role. , can effectively improve the quality of the adjustment system to ensure long-term operation of the production equipment.

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