Vacuum system and process for distillation tower for producing three-mixed fraction reduced pressure tar

Abstract

The invention relates to the technical field of metallurgical coking, in particular to a vacuum system and process for a three-mixed fraction vacuum tar distillation tower. The system comprises a reflux tank, a vacuum catcher and a vacuum cooler; the reflux tank is divided into a first chamber and a second chamber which are independent by a partition plate, the second chamber is directly connected with the vacuum catcher, the first chamber and the second chamber are connected with the vacuum cooler through pipelines, and the vacuum catcher is connected with the vacuum cooler and a diffusing system through pipelines; the tower top of the vacuum tar distillation tower is connected with the first chamber through a pipeline, the first chamber and the second chamber are connected with the reflux pump through pipelines, and the reflux pump is connected with the tower top of the vacuum tar distillation tower through a pipeline. The content of condensed oil gas similar to wash oil in vacuum air is reduced, the quality of the vacuum circulating liquid wash oil is guaranteed, the operation time is prolonged, and the replacement period is shortened; the temperature of vacuum air entering the liquid ring type vacuum pump is reduced, the normal air pumping capacity of the liquid ring type vacuum pump is guaranteed, and the situation that the air pumping capacity of the vacuum pump is reduced due to too high temperature of the entering vacuum air is avoided.

Description

Technical field[0001]The present invention relates to the field of metallurgical coking techniques, and more particularly to a vacuum system and process for 3 mixed fraction reduced pressure tar-resistant distillation columns.Background technique[0002]Coal tar process is a conventional method for dividing the most basic conventional methods of dividing tar under industrial conditions. At present, domestic tar distillation, process is divided into normal pressure distillation, often-decompression distillation, decompression distillation process according to pressure; process according to cutting fractions into narrow distillate processes and three mixing processes, and combine different processes Process.[0003]Under the premise of determining a narrow fraction or triamatic product solution, tar domes-reduced pressure continuous distillation process and tar decompression continuous distillation process is the development trend of today's tar-processed, and should be preferred. The pur...

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Problems solved by technology

[0006] 1) Vacuum air contains condensed oil and gas of different components. The nature of this part of oil and gas is similar to that of washing oil. According to the principle of similar compatibility, oil and gas similar to washing oil in vacuum air are absorbed by the washing oil of vacuum circulating fluid, resulting in vacuum circulating fluid The quality of the washing oil will soon decline, and the washing oil of the vacuum circulating fluid needs to be replaced frequently and regularly, which seriously affects the continuous and stable operation of tar production

[0007] 2) The working temperature of the reflux tank is 80-100°C. At the same time, in order to prevent the precipitation of naphthalene in the vacuum air, the accompanying design of the vacuum air pipeline is made. The temperature of the vacuum air is basically between 80-100°C. Such a high temperature directly When it enters the liquid ring vacuum pump, the temperature of the vacuum circulating liquid washing oil will rise, which will directly lead to the insufficient pumping capacity of the vacuum pump, so that the quality of the three-mixed fraction will decrease, or even fail.

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