Crude benzene distilling and washing oil regenerating heating system and method

Abstract

The invention discloses a crude benzene distilling and washing oil regenerating heating system and method. The system comprises a heating furnace, a benzene removing tower, a regenerator and a heater, an oil steam outlet, an oil outlet and a rich oil inlet are arranged at the top, at the bottom and on the upper portion of the benzene removing tower respectively, the oil outlet at the bottom is connected with an oil inlet of the heating furnace, an oil outlet of the heating furnace is connected with an inlet of the heater, an outlet of the heater is connected with an oil inlet at the bottom of the benzene removing tower, a regnerated washing oil inlet is arranged on the upper portion of the regenerator, a regnerated oil steam outlet and a slag oil outlet are arranged at the top and the bottom of the regenerator respectively, the regenerated washing oil inlet is connected with the oil outlet of the heating furnace, the oil steam outlet at the top of the regenerator is connected with an oil steam inlet at the bottom of the benzene removing tower, and the oil outlet at the bottom of the benzene removing tower is connected with a lean oil benzene washing system. The heating furnace is adopted to heat circular washing oil and provides heat for washing oil regeneration and benzene removal, so that the system is low in investment and easy to operate; high-temperature oil steam generated by washing oil regeneration is utilized as one part of heat for benzene removal, so that energy resources and cooling water are saved.

Description

technical field [0001] The invention relates to a negative pressure crude benzene distillation process in the coking industry, and provides a crude benzene distillation and oil washing regeneration heating system and method. Background technique [0002] Compared with the atmospheric pressure steam stripping method in the coking industry, the negative pressure crude benzene distillation process method in the coking industry has recently attracted the attention of the industry and will be widely used due to its high benzene removal efficiency, energy saving, and water saving. , the regeneration of washing oil in the previous atmospheric pressure water vapor stripping crude benzene distillation process is to use high-temperature (350 ° C ~ 450 ° C) superheated steam to directly heat and vaporize, which consumes a lot of water vapor, and the washing oil in the negative pressure crude benzene distillation process The regeneration of oil is a subject. There are three methods for ...

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Problems solved by technology

[0003] There are obvious defects in the three methods of regeneration of the washed oil in the negative pressure crude benzene distillation process used in the prior art. (1) The direct heating method of superheated steam (300 ° C ~ 400 ° C) still uses a large amount of superheated Water vapor and negative pressure have high efficiency in removing benzene, and the effect of energy saving and water saving is not obvious; (2) The two-way heating method of benzene removal cycle washing oil and regeneration cycle washing oil requires two heating furnaces or one heating furnace to accurately heat two different Higher temperature medium, increased investment and difficult operation; (3) Benzene removal cycle washing oil and regeneration cycle washing oil are heated together in different vacuum regeneration methods. Two vacuum systems are required for benzene removal and oil washing regeneration, and the oil vapor heat for oil washing regeneration has no recycle and re-use

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