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当前各氯碱厂的增产在一定程度上受到能源的限制,因为大多数厂都在“限制用电量”的情况下运行。在氯碱厂的总耗电量中交流负荷约占25～30%,在交流负荷中耗电量最大的是泵和风机。因此如能压缩离心泵和风机的耗电量就会为增产烧碱创造条件。绝大多数的泵与风机是由交流异步电动机(AC)拖动的,由于产量的变化以及所选用的泵能力一般要大于正常用量,所以需经常对泵的流量加以控制。传统的控制方法是泵出口装节流伐或者调节泵的回流量,但这样会造成能量的大量浪费。如果全部采用调泵的转速来控制流量则能节约总交流耗电量30%左右的电能。作者在本文中比较了不同控制方法泵的能耗和机械特性、简述了AC 电动机的调速方法,并对如何进行这项改造工作提出建议。
At present, the increase of each chlor-alkali plant is somewhat limited by the energy source, because most plants operate under “limited electricity consumption”. Chlor-alkali plant in the total power consumption of AC load accounts for about 25 to 30% of the AC load in the largest power consumption of the pump and fan. Therefore, if the centrifugal pump and fan can compress the power consumption will increase production of caustic soda to create conditions. The vast majority of pumps and fans are driven by alternating current asynchronous motors (AC), and pump flow is often controlled due to changes in output and the ability of the pump to be selected for greater than normal use. The traditional control method is to throttle the pump outlet or regulate the pump backflow, but this can cause a lot of energy waste. If all the pump speed to control the flow rate can save about 30% of the total AC power consumption. In this paper, the author compares the energy consumption and mechanical characteristics of pumps with different control methods, briefly describes the speed regulation method of AC motor, and puts forward suggestions on how to carry out this reform.