The filter element of the high-pressure filter is composed of a porous silicon carbide support framework and a high-alumina andalusite filter membrane. The combination of the support framework and the filter membrane ensures both low pressure drop during the filtration process and high filtration accuracy. The filter element is a candle-shaped ceramic filter tube with a closed bottom and an open top, through which the filtered syngas is discharged. At the top, there is a neck section used to secure the filter element onto the tubesheet. In a high-temperature and high-pressure filter, multiple sets of ceramic tube banks, each consisting of a single filter element, are arranged and fixed onto the tubesheet. The tubesheet divides the high-pressure filter into two parts: the dusty gas side at the bottom and the clean gas side at the top.
Dust-laden syngas enters the high-pressure filter and is guided by four rising pipes to the lower part of the tubesheet, essentially forming a cocurrent flow. The dusty gas permeates into the filter element, and the ash remains on the outer surface of the filter element, forming an ash cake. The clean gas then enters the clean gas side. Once the ash cake is formed, it works together with the filter membrane to enhance filtration. As the ash cake gradually thickens, the precision of dust filtration improves, and the differential pressure across the filter element gradually increases. The filter elements are cleaned by a back-blowing system, where each back-blowing valve corresponds to a set of filter elements. The back-blowing valve generates a high-pressure pulse gas, which partially converts its kinetic energy into potential energy in a Venturi tube, creating a low-pressure zone that allows clean gas to enter the Venturi tube and cleanse the set of filter elements. The back-blowing air flows in the opposite direction of the main airflow, blowing off part of the ash cake, thereby maintaining stable differential pressure across the filter element. The ash cake falls by gravity into an ash collector and is subsequently discharged through an ash storage tank.
High-pressure filter elements are installed on the pressure piping of hydraulic systems to filter out mechanical impurities mixed in hydraulic oil, as well as gums, asphaltenes, carbon residues, and other substances resulting from chemical changes in the hydraulic oil itself. This prevents issues such as stuck valve cores, clogged throttle orifices and damping holes, and excessive wear of hydraulic components. While high-pressure filters offer excellent filtration efficiency and precision, cleaning them after clogging is difficult, necessitating the replacement of filter elements.
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