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The technology has the following main features: Based on computer simulation and virtual computing technology, the parameters of the thermodynamic equations are regressed and corrected, and a mathematical model that can accurately simulate the separation of coal tar distillation is proposed and numerically solved. The entire process of tar has undergone detailed simulation calculations and process parameter optimizations on a board-by-plate basis, which has greatly improved the overall design accuracy; a process flow for the initial decompression of coal tar primary distillation combined with a heat exchanger network has been used to replace the existing one tower atmospheric pressure. The process reduces the operating temperature of the entire process, reduces the heat consumption, improves the coking condition of the evaporator, and improves the cutting accuracy of the distillate and the concentration of phenol and naphthalene; the patented product, the inclined tray, is used as the internals of the tower to increase The efficiency reduced the tower pressure and effectively relieved the caking of the tower kettle.
This technology has been successfully applied to the coking production process, which can reduce heat consumption by more than 20% and increase the concentration of phenol and naphthalene by more than 10%. Calculated with a coal tar unit with an annual processing capacity of 70,000 tons, this technology can generate more than RMB 1 million annually.
Coal tar contains a large number of aromatic compounds that can be used as intermediates in chemical, pharmaceutical, and material industries. Light oil, phenol oil, naphthalene oil, wash oil, and eucalyptus oil fractions can be formed through the initial distillation process. Tsinghua University has recently developed a new type of primary and vacuum primary distillation technology, which has significant energy-saving effects and can produce good economic benefits.