Automatic filtering device for low-temperature coal tar and working method of automatic filtering device

Abstract

The invention discloses an automatic filtering device for low-temperature coal tar and a working method of the automatic filtering device. The automatic filtering device comprises a filter, a filtering system, a cleaning system, a slag discharging system and a control system, wherein the filtering system comprises a filter, a stock solution tank, a stock solution inlet valve, a clean liquid tank, a clean liquid outlet valve, a gas discharging valve and a waste gas tank; the cleaning system comprises a filter, a cleaning liquid storage tank, a cleaning liquid conveying pump, a cleaning liquid inlet valve, a cleaning liquid outlet valve and a cleaning liquid recycling tank; the slag discharging system comprises a filter, a slag discharging valve and a filtered slag recycling tank. By the adoption of a cylinder for controlling a slag scraping piston to move up and down to realize auxiliary slag discharging, the automatic filtering device has the advantages that a backwashing step and an immersing step which are executed after every filtering are eliminated, the filtering period is greatly shortened, and the filtering efficiency is improved; meanwhile, the using amount of cleaning liquid is lowered, waste of raw materials and polluted oil are avoided, and requirements on energy conservation and environmental friendliness are met.

Description

technical field [0001] The invention relates to a low-temperature coal tar processing technology, mainly an automatic filter device for low-temperature coal tar and a working method thereof. Background technique [0002] Low-temperature coal tar is the product of dry distillation of coal at low temperature in the coking process. Its composition is very complex, in which the content of hydrocarbons is 45%~70%, the content of phenolic compounds is 15%~30%, and the content of asphalt It is 10%~15%, and also contains a small amount of other substances. At present, low-temperature coal tar is mainly used in the production of liquid fuels and chemicals, but due to its high content of solid impurities such as coal powder and coke powder, it needs to be treated before processing low-temperature coal tar to reduce the solid content in raw materials At present, the more advanced treatment method is to use multi-layer wire mesh sintered filter element to filter the low-temperature coa...

AI Technical Summary

Problems solved by technology

[0003] 1. The filtration flow rate is small, the filtration cycle is long, and the filtration efficiency is low;

[0004] 2. After each filtration, the filter element needs to be backwashed. The consumption of cleaning fluid is large, and a large amount of dirty oil with a large solid particle content will be produced, which not only causes the loss of raw material oil, but also increases the difficulty of post-processing ;

[0005] 3. The degree of automation is low, and continuous operation cannot be realized

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