Process and description of the sulfur recovery unit

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Sulfur foam floats on the expanded part of the spray oxidation regeneration tank; by adjusting the liquid level, it overflows into the sulfur foam intermediate tank, from where it is then pumped to the sulfur foam tank using compressed air. The sulfur foam is heated to 65–75°C in this tank before being transferred to the filtration tank. There, it undergoes cyclic vacuum suction and air blowing through the drum of a vacuum filter, thereby achieving separation of sulfur paste from the mother liquor. The sulfur paste adhering to the filter cloth is scraped into a sulfur paste funnel using a scraper. It is then placed in a sulfur melting tank, where it is indirectly heated to 130–140°C using steam, allowing the sulfur paste containing moisture and impurities to be separated, thereby yielding sulfur product. The air used for purging the filter is supplied from the air compressor station; after being depressurized to 0.01–0.03 Mpa, it enters the filter and is distributed to the drum via a distribution head. The vacuum level in the drum chamber is created through the distribution head by the solution nozzles on the spray oxidation regeneration tank, which draw in air during spray oxidation regeneration. The mother liquor entrained in the extracted gas is collected in a vacuum filtration liquid collection tank and then returned to the rich liquid tank for reuse.