Method for changing benzol scrubber to scrub oil when resistance rises in winter

Abstract

The invention discloses a method for replacing wash oil in a benzol scrubber when the resistance is increased in winter, which is characterized in that: an underground waste oil tank is emptied at first, and then a regenerator is emptied; the benzol scrubber is washed by hot lean oil which is then discharged into the underground waste oil tank through a hose; when exhaust of the wash oil can be observed on an outlet of the hose, impurity deposits such as naphthalene, tar, etc. on plastic rosette filler in the benzol scrubber are washed away; gas flows up and the resistance is reduced to an adequate range; and a slippage pump is opened to draw off fresh oil in a fresh oil tank, and the fresh wash oil is compensated into the benzol scrubber for circulation. The method for replacing the washoil does not require stop of production and cleaning of the scrubber, thereby the time for replacing the wash oil can be greatly shortened and a great deal of labor power and financial power can be reduced; and residual waste oil can be used as circulation wash oil continuously after deposited through the underground waste oil tank. The method not only is convenient, quick, safe and reliable but also is energy-saving and environment-friendly, and can be widely used for replacing the wash oil in the benzol scrubber when the resistance is increased in winter.

Description

technical field [0001] The invention belongs to a treatment method when the resistance of a benzene washing tower rises in winter, in particular to a method for replacing washing oil when the resistance of a benzene washing tower rises in winter. technical background [0002] The gas produced by the low-temperature or high-temperature dry distillation of coal in the coking plant contains aromatic compounds such as naphthalene. In order to purify the gas and recover crude benzene, oil washing is often used at home and abroad to absorb the benzene in the gas, and then use gas stripping Method to remove benzene in the washing oil. The most advanced technological process at home and abroad is to use the benzene washing tower and the benzene removing tower process of the tubular heating furnace. The benzene-containing washing oil-rich oil obtained from the benzene washing tower After the oil heat exchanger raises its temperature to 130-140°C, it is dehydrated and sent to a tubula...

AI Technical Summary

Problems solved by technology

The current problems in use are: due to the full contact and absorption of the gas and washing oil, the benzene in the gas is absorbed by the washing oil and becomes rich oil, which is pumped into the debenzene tower by the rich oil pump, while a large amount of naphthalene and tar in the gas These impurities such as naphthalene and tar are mostly attached to the surface of the plastic garland. When the benzene washing tower runs for a long time, the naphthalene, tar and other impurities washed down by the washing oil in the benzene washing tower will Tar and other impurity deposits accumulate more and more, leaving a large amount of naphthalene, tar and other impurity deposits in the gaps of the plastic garland, which increases the resistance of gas to the upward flow in the benzene washing tower and affects the absorption effect of gas and washing oil , reduces the quality of the gas, the benzene washing effect is poor, the washing oil quality deteriorates, black and sticky, difficult to pump, affects the normal operation of the subsequent process, and the crude benzene output decreases

The disadvantages of this solution are: it requires a lot of manpower, material resources, financial resources and time, and at the same time, the crude benzene washing of the debenzene tower must be stopped, which will affect the crude benzene output and cause great economic losses.

In addition, if it is in winter, this kind of tower scraping work cannot be carried out at all, because after the shutdown of the tower, the lean and rich oil in the lean and rich oil pipelines will stay in their pipelines due to the low temperature, which is very easy to cause The pipes are clogged, so you have to wait until the atmospheric temperature is high before you can scrape the tower

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