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一、引言在石油、化工、制药、啤酒制造以及其它类似的工业原料降温过程中,如采用螺杆双温冷源机组分级降温的形式进行冷却,利用螺杆压缩机的特点,即利用二次吸气,一方面利用了低品位的冷量,另一方面更加充分的利用了螺杆转子的容积,可使机组的总制冷量提高25～75%,而效率提高15～51%,因此,这是工业原料冷却工艺的一项重大进步。二、传统的冷却工艺以往通常使用的传统系统中,制冷工质从压缩机出来后进冷凝器冷凝,然后通过膨胀阀
I. INTRODUCTION In the cooling process of petroleum, chemical industry, pharmacy, beer making and other similar industrial raw materials, such as using screw twin-temperature cold source unit to cool in the form of graded cooling, the characteristics of screw compressor are utilized, that is, , On the one hand the use of low-grade cold capacity, on the other hand more fully utilize the volume of the screw rotor, the total cooling capacity of the unit can be increased by 25 to 75%, while the efficiency increased by 15 to 51%, therefore, this is the industry A major advance in the raw material cooling process. Second, the traditional cooling process Traditionally used in the traditional system, the refrigerant from the compressor out of the condenser into the condensing, and then through the expansion valve