Scraping plate filtration device and purification system applied to high-temperature coal tar purification system

The utility model discloses a scraping plate filtration device and a purification system applied to a high-temperature coal tar purification system. According to the scheme, high-temperature coal tar enters a filtration barrel through a scraping plate filter inlet, solid impurities in the coal tar are intercepted and left on the inner surface of a filter element, one part of filtered coal tar enters a cleaning tank, and the other part of the filtered coal tar is discharged from a coal tar discharge pipeline. When a filtration medium needs to be cleaned, a scraping plate constantly moves vertically to scrape off solid impurities depositing on the surface of the medium; when the impurities are separated from a filter sieve, dirt is fed to a slag collection chamber at the bottom of a shell through a cleaning plate and is discharged from a slag discharge port, and the filter element is cleaned. After the scraping plate filtration device runs for a long period of time, the filter element is reversely cleaned so that impurities on the inner surface of the filter element and incapable of being scraped off can be cleared away. The scraping plate filtration device has the advantages that a closed process is adopted for the scraping plate filtration technology, filtration is directly conducted without adding filter aids, high-temperature corrosion resistance is achieved, filtration precision is high, the scraping plate filtration device is especially suitable for high-viscosity fluid, and energy consumption is low.