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1概述全国风机、水泵、空压机约有4200万台,装机容量约为1．1亿kW。而在实际应用中,风机、水泵、空压机类装置通常以满足生产方案的最大需要为设计原则。在生产过程中,流量、液面、压力等参数常随工况的改变而改变。一般都不是运行在最大工况条件下。过去,由于技术水平的限制,没有一种合适的调速方法,因此只能采用控制阀门或档板开度的方法来改变流量、压力、液面等,即用增加阻力的办法实现调节。工艺需要小流量时,大量能量损失在阀门或档板上,系统实际运行效率仅为30%～40%。据统计,全国风机、水泵、空压机年消耗电量约占总
1 Overview The country’s fans, pumps, air compressors about 42 million units, installed capacity of about 110 million kW. In practical applications, fans, pumps, air compressors and other devices are usually designed to meet the needs of the largest production program for the design principles. In the production process, flow, liquid level, pressure and other parameters often change with changes in conditions. Generally not running at maximum operating conditions. In the past, due to technical limitations, there is no suitable method of speed regulation, so only the method of controlling the opening of the valve or the baffle can be used to change the flow rate, pressure, liquid level, etc., that is, the method of increasing the resistance is used to adjust. When the process requires a small flow, a large amount of energy is lost on the valve or the baffle, and the actual operating efficiency of the system is only 30% -40%. According to statistics, the country’s fans, pumps, air compressors in about the total electricity consumption