Device for heating rich oil, distilling and producing crude benzene by using waste heat of raw coke oven gas under negative pressure

Abstract

The invention discloses a device for heating rich oil, distilling and producing crude benzene under negative pressure by using waste heat of raw coke oven gas, and relates to the technical field of energy conservation and emission reduction. The device comprises a water supply tank, a water supply pump, a heat exchanger, a water supply preheater, a steam-water separator, an ascending pipe evaporator, an ascending pipe superheater, a rich oil heat exchanger, a debenzolization tower, a wash oil regenerator, an oil-steam heat exchanger, a benzene condensation cooler, a vacuum pump and a gas-liquid separator. According to the invention, the saturated steam produced by the invention has the following purposes that one part of the saturated steam is used for the wash oil regenerator after beingoverheated, the other part is conveyed to the rich oil heat exchanger to heat rich oil, the other part enters the water supply preheater to heat feed water, and the residual part is merged into a low-pressure saturated steam pipe network, so that the boiler load and the boiler gas consumption can be reduced. The boiling point of benzene is reduced by adopting negative pressure debenzolization, sothat the benzene contained in the rich oil entering the debenzolization tower can be desorbed from the rich oil without increasing the temperature to the original temperature, and the wash oil regenerator does not need much steam any more under negative pressure so as to bring significant safety and economic benefits to enterprises.

Description

technical field [0001] The invention relates to the technical field of energy saving and emission reduction, in particular to a device for heating rich oil with waste heat of raw coal gas, distillation and negative pressure production of crude benzene. Background technique [0002] Coking enterprises generally use the traditional process of refining coke in the carbonization chamber. The coking coal added to the carbonization chamber is heated to produce a large amount of raw gas. The temperature is 650°C-800°C. Its function is to introduce the high-temperature raw gas produced in the carbonization chamber into the gas collecting pipe, and the waste heat of the high-temperature raw gas passing through the rising pipe has not been utilized for many years, and the heat can only be wasted by cooling down with circulating ammonia water. In recent years, some coking enterprises have begun to recycle the waste heat of the rising pipe. However, the steam produced is basically merge...

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Problems solved by technology

In addition, the tube furnaces for heating rich oil and steam often have production safety accidents during operation, and they are all built in the production area and are operated with open flames, which do not meet the current safety production regulations. Therefore, these problems have brought safety production problems. Hidden dangers are also a difficult problem that coking enterprises are eager to solve

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