Energy-saving method and system for heating coking crude benzene storage tank

Abstract

The invention belongs to the technical field of the purification of coke oven gas, and relates to a method and system for heating a crude benzene storage tank, in particular to an energy-saving method and an energy-saving system for heating the coking crude benzene storage tank. According to the method and the system, the conventional coked hot washing oil (at the temperature of between 80 and 95 DEG C) is used as a heating medium; a pipeline which is connected to an outlet of a hot lean oil pump is connected with a heater of the crude benzene storage tank, so that the hot washing oil is subjected to indirect heat exchange with materials in the tank by the heater of the storage tank, and after temperature of the hot washing oil is reduced to be 60 to 70 DEG C, the hot washing oil flows back to a lean oil tank; and the materials in the storage tank are heated to be 60 to 70 DEG C by the hot washing oil to fulfill the aim of the comprehensive utilization of waste heat. The method and the system are easy to operate, the temperature of the heated materials is easy to control, and the waste heat of the conventional hot washing oil is utilized fully; and the hot washing oil replaces steam to be used for the heating and heat preservation of the storage tank, so that a large amount of energy is saved, the production cost is reduced, the temperature drop of the hot washing oil to be cooled is realized to a certain degree, and energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of coke oven gas purification, and relates to a crude benzene storage tank heating method and system, in particular to an energy-saving coking crude benzene storage tank heating method and system. Background technique [0002] In the production process of crude benzene in the gas purification process of the coking plant, because the washing oil is used to spray and absorb the organic substances such as benzene, toluene and naphthalene in the gas, the washing oil (called rich oil) pretreatment that absorbs the organic substances such as benzene, methylbenzene and naphthalene After heating, it is sent to the debenzene tower for debenzene and naphthalene removal. The washed oil after debenzene (called lean oil) flows to the bottom of the debenzene tower by itself at a temperature of 175-185°C. The lean-rich oil heat exchanger performs heat exchange with the benzene-containing rich oil from the benzene washing t...

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Problems solved by technology

[0004] "Application of Heat Transfer Oil Technology in Coking Ammonia Distillation Process" published by Yuan Qiuhua in the 20th issue of 2011 in "Science and Technology Information Development and Economics" describes that the heat transfer oil is heated with coke oven gas, and the heat transfer oil is heated to 250°C. The heat transfer oil is used to heat part of the ammonia distillation wastewater, so that part of the ammonia distillation wastewater becomes saturated steam and enters the ammonia distillation tower instead of direct steam for ammonia distillation. This process uses the self-produced gas of the coking plant as energy to heat the heat transfer oil , and then use heat transfer oil to heat ammonia distilled wastewater to generate steam. This process is mainly to reduce the amount of wastewater discharged from ammonia distiller. The heat transfer oil heating process also consumes a lot of gas, and at the same time needs to set up a special Heating device, high operating cost and upfront investment

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