The article presents data on the calculated values of improving the efficiency of fuel use at the thermal power plant as a result of the introduction of a technical solution for cooling the flue gases of boilers to the lowest possible temperature under the conditions of safe operation of reinforced concrete and brick chimneys with a constant value of the flue gas temperature, when changing the operating mode of the boiler.
Every petrochemical and petroleum refining enterprise is faced with the problem of flare gas recovery, which is important from the standpoint of the ecology and production efficiency.Until recently primarily piston compressors were used for those purposes, but could not sufficiently ensure reliable operation for a number of characteristics which must be taken into account when compressing flare gas. They are as follows: the amount of gas is not constant, the composition of the gas varies over a wide range, the gas contains components which condense during compression, and the gas contains corrosive components.Screw compressors with a conventional system have long been used to compress hydrocarbon gases. The gas to be compressed is in contact with oil that lubricates the bearings. Individual components of the gas dissolve in the oil, changing its viscosity and lubricating properties, thus shortening the life of the bearings and, therefore, the reliability of the compressor operation.Over a number of years NIIturbokompressor carried out experiments and research on increasing the reliability of screw compressors during compression of flare gas:-use of screw compressors with oil injection into the operating cavity and a separate bearing lubrication system; -use of dry-compression multistage screw compressors. In the first version, face seals separate the compression cavity of the compressor from the space containing the bearings, a second oil line is introduced to lubricate the bearings and seals (Fig. 1), the oil from which does not come into contact with the gas being compressed.The change in the physical properties of the oil injected into the working cavity does not affect the life of the bearings. Moreover, malntaihing the optimal injection temperature reduces the solubility of the gas components in the oil and ensures safe compressor operation.The first compressor installations with a separate lubrication system were made at NIIturbokompressor for the Tatneft" Company (type 5GV-I~6 M1) and the Ufaneftxim Company (type 7GB--40/1,2-I 1M1).Graphite slot seals fed with a sealing gas (nitrogen) can be used as a separating element. A compressor with a sealing gas was made by NIIturbokompressor for the Ryazan' Refinery (type 6GB-28/8 M1). The use of a system with separate lubrication lengthened the service life of the bearings and decreased the number of repair cycles.The built-in flow rate regulator of the screw compressor allows the discharge characteristics of the compressor to be changed smoothly and economically. The change in power consumption over a wide range is practically proportional to the change in flow rate (Fig. 2).In the second version, two-or three-stage dry compression compressors are used to compress flare gas. This system is implemented in the 965GV-200/19S compressor made by the Kazan'kompressormash Company for AD "Neftokhim" (Bulgaria). The compressor with a flow rate of 200 m3/min and a final pressure of 1.9 MPa was built as a three-stage machine with intermediate and final cooling of the gas (F...
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