A speed-adaptive air volume adjustment method for reciprocating compressors

Abstract

The invention relates to a rotating speed self-adaptation reciprocating compressor air flow adjusting method. Self-adaptation adjusting of control parameters and load correction of the exhaust amountof a reciprocating compressor during compressor rotating speed change can be achieved, and the aim of stabilizing the exhaust amount of the compressor is achieved. Most enterprises adopt fuel gas engines or steam turbines to serve as driving devices to drive compressors, the rotating speed fluctuates, and in order to overcome the technical defect that the compressor rotating speed fluctuates, andthe effective air flow adjusting of a unit cannot be achieved, unloading devices are arranged on all stages of air inlet valves of the compressor, through control over the ejecting signal output timeand continuous time, the air flow 0 to 100% full-scale infinitely variable control is achieved, stop signals collected in real time use the digital filtering technology for calculating the current real-time rotating speed of the compressor, according to the current real-time rotating speed, the control parameter is adjusted in a self-adaptation manner, the mean running rotating speed of the compressor is corrected at regular intervals, the manually set unit actual required exhaust amount and the compressor air suction amount under the corrected mean running rotating speed are subjected to ratio calculation of the first-stage load ratio, the set pressure ratio manners are adopted in other stages, a PID controller is applied to automatically calculate the load ratio, and the aim that under the different compressor rotating speeds, the unit inter-stage pressure ratio and the un-changing gas displacement are kept is finally achieved.

Description

technical field [0001] The invention relates to an air volume adjustment method of a reciprocating compressor with self-adaptive speed, which realizes the precise control of the displacement of the reciprocating compressor under the fluctuating state of the speed, and achieves the purpose of stabilizing the displacement of the compressor. Background technique [0002] Reciprocating compressor is a kind of positive displacement compressor. It relies on the reciprocating motion of the piston in the cylinder to compress the gas in the cylinder. Process production requirements. Reciprocating compressors are widely used in various industrial fields such as petroleum, chemical industry, fertilizer, and natural gas transportation. However, when designing the rated displacement of the compressor, it is often considered that there is some margin on the basis of the required displacement, and the compressor manufacturer often adds some margin to the given rated displacement. The des...

AI Technical Summary

Problems solved by technology

In CN102937084A, the actuator motor is used to drive the pressure rod of the suction valve to move axially, and the front end of the pressure rod of the suction valve controls the position of the valve plate of the suction valve through the fork control, so that the suction valve is delayed and closed according to the control requirements, and the air volume of the compressor is realized. Automatic stepless adjustment, this method is difficult in actual operation and cannot effectively adjust the gas volume in real time

When the rotation of the reciprocating compressor changes, using the rated speed to control will cause inaccurate control of the gas volume, and even cause the unit's gas valve to work in an abnormal state, causing a breakdown and shutdown

In order to prevent the poor adjustment effect caused by the speed change, a speed adaptive air volume control method for reciprocating compressors is proposed to realize the self-adaptive adjustment of control parameters according to the speed at different speeds to achieve safe, stable and accurate Gas volume adjustment effect

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