Huangling coal chemical industry: automatic control system for compressor

Recently, with the successful operation of the automatic control system of the synthetic gas compressor in Huangling coal chemical industry alcohol ammonia workshop of Shaanxi coking company, the energy-saving technical transformation project of the synthetic gas compressor lasted for 5 months was completed on schedule. What the technical reform personnel are quite fond of is that they have successfully alleviated the surge problem of the compressor by using the automatic control system.

This transformation is relatively successful. It can be said that it integrates "intelligence + safety". During the production and operation period, the automatic control system can not only make the unit run more smoothly, but also save about 5 tons of steam per hour, and directly save more than 16000 yuan of cost per month. At the same time, it can optimize the operation of post staff, which is really more than one stroke. " Said an Haolong, equipment technician of alcohol ammonia workshop of Huangling coal chemical industry of Shaanxi coking company. Since this year, the company has made great efforts in equipment management and technical transformation, and carried out energy conservation and consumption reduction from details. As an important equipment of coke oven gas methanol plant, the two in one compressor, due to the difference between the designed antisurge curve and the actual operation, and the timeliness of manual control antisurge valve, causes the operation curve far away from the antisurge line in the daily production regulation, and can not effectively play the effect of antisurge control valve, not only increases the steam consumption, resulting in energy waste, but also Increased equipment loss. In order to completely solve the problem of restricting production capacity, the technical personnel of the workshop, through investigation, research and exploration, contact with the manufacturer's on-site technical exchange, check and discuss various parameters, and finally put forward the technical transformation scheme of adding anti surge energy-saving optimal control self-adjusting system to the two in one anti surge valve to control the operation curve within a reasonable range. In July, the workshop used the system shutdown time to carry out equipment maintenance for the unit, preliminarily debugged the compressor anti surge program and optimized the technical transformation.

It is learned that the automatic control system put into use for the two in one compressor this time is to make the unit operate in the most ideal state by analyzing the system operation data and automatically adjusting the load, so as to reduce the energy consumption. At the same time, the new system is equipped with two security lines, namely surge baseline control and surge response. When the system is normal, the working point is on the SCL line or in the line; when the system load changes, the working point crosses the SCL and approaches the SRL line, the working point moves the surge valve to open automatically for 15 degrees; when the load changes rapidly and is about to reach the SLL line, the surge valve will open fully to prevent the unit from surging. In addition, the valve opening mode of the new system is faster and more accurate than that of personnel operation, which fully guarantees the stable, safe and economic operation of the unit.