Abstract
In selecting the equipment for utilization of petroleum gases, it is important to assess the economic efficiency of its use. A detailed economic analysis was conducted in [1], where liquid-jet and screw compressors are compared. It was observed that in creating a liquid-jet compressor installation (LJCI), the basic investments are for acquiring powerful pumping aggregates and construction-repair work. The operating expenses are primarily due to the cost of the electrical power used. Liquid-jet compressors are economically efficient because of storage of hydrocarbon raw materials, including petroleum gas and drop oil present in the gas. All of these hydrocarbon raw materials are burned in flares when there are no compressor installations. According to the data in [1 ], the investments for jet technology are two times lower than for screw compressors. The of%rating expenses using jet technology are one-third lower. A disadvantage of LJCI in comparison to screw compressors is the 1.5-2 times higher consumption of electrical power [ 1]. An important reserve in reducing the operating expenses is the use of thermal energy generated by LJCIs. It should be noted that the appropriate conditions and equipment are required for this purpose. All calculations of the economic efficiency involve estimating the efficiency of the compressor installation. For a detailed examination of this question, we will use the theory elaborated at OAO Orenburgneft'. [2, 3] in designing liquid-jet compressors. This theoretical elaboration qualitatively differs from the other existing studies. The relationships of all working parameters of the compressor installation as a whole, including the operating characteristics of the heavy-duty pumps and servo motors, are considered. A universal calculation method and the corresponding computer software were developed, but the common graphic and analytical methods of calculation were not used. Theoretical elaborations were supported by experimental studies [4]. In further elaborating the jet compressor theory, it is necessary to consider the effect of the reduced pressure Pe, which can be represented as the ratio of the pressure of the working liquid at the inlet into the nozzle to the pressure of the gas at the inlet into the compressor. Complements were introduced in the method of calculation, and three previously introduced empirical coefficients (kt; k2; k3) were substituted by five new coefficients (KI; K2;/(3; K4; K 5) with consideration of the following relations:
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