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随着外界负荷大幅度的变化,虽然螺杆式缩机可以采用滑阀来调节其输气量,但是,对于用单台压缩机组成的单级系统来说,其在低负荷下的功耗仍然要比多联机组构成的系统高得多.在同一系统中采用多台螺杆式压缩机并联来代替单台压缩机运行,在冷负荷发生动态变化时,并联压缩机组将通过 PIE和各种传感器所组成的控制系统,调节整个制冷系统中压缩机的减载、启动、停机,使得并联压缩机组的吸气压力保持在恒定和正常的工作范围内工作,从而大大提高了系统的工作效率,节省能源;特别是在制冷量较大,而且制冷量波动明显的系统中,节能控制的效果更为明显,PLC 是一种具有高可靠性的控制,以其和触摸屏组成的监控系统,对多台螺杆式压缩机并联的运行进行控制是一种最优的选择,并最终能够通过现场总线整合各个设备的控制系统来实现冷库系统的 DCS 控制模式。
As the external load changes drastically, although the screw-type compressor can adopt the slide valve to regulate its gas transmission capacity, the power consumption at low load of a single-stage compressor with a single compressor is still It is much higher than that of multi-unit system.In the same system, multiple screw compressors are used in parallel to replace single compressor operation. When dynamic load changes, parallel compressor units will pass PIE and various sensors The control system consists of regulating the load shedding, starting and stopping of the compressors in the whole refrigeration system so as to keep the suction pressure of the parallel compressors working in a constant and normal working range, thereby greatly improving the working efficiency of the system and saving Energy; Especially in the cooling capacity larger, and the obvious fluctuations in cooling capacity of the system, the effect of energy-saving control is more obvious, PLC is a highly reliable control, with its touch screen and control system composed of multiple Screw compressor parallel operation control is an optimal choice, and ultimately able to integrate the various devices through the field bus control system to achieve cold storage DCS control module formula.