Dynamic filtering pressing dehydrator

Abstract

The invention discloses a dynamic filtering pressing dehydrator, comprising as least one filtering unit. Each filtering unit comprises two parallel filter plates; an elastic pressing frame consisting of an elastomer and a filtering frame is arranged between the two parallel filter plates at a position jointing the filter plate external edges; the filtering frame is arranged at an external side of the elastomer; the elastomer and the filter plates are fitted in seal; the elastic pressing frame and the two filter plates form a filter chamber; filter plate planes on two side of the filter chamber are pressing planes; a thickness of a filter plate at the filter plate plane is larger than a thickness at an elastomer bearing plane; and a thickness of the elastomer in an unpressed state is larger than a sum of an elastomer pre-pression amount and 3.3 times an elastomer compression amount. According to the invention, the thickness of the elastomer in the unpressed state is larger than the sum of the elastomer pre-pression amount and 3.3 times the elastomer compression amount, therefore the pressing planes restrict a pression rate of the elastomer; meanwhile the pre-pression on the elastomer before the pressing filtering prolongs a service life of the elastomer.

Description

technical field [0001] The present invention relates to filter presses. Background technique [0002] Existing sludge dewatering, most countries in Europe, America, Japan and China mostly use vacuum belt press filter, decanter centrifuge and diaphragm press filter press, and the sludge should be treated with coagulant and added according to the nature of the sludge Filter aids agglomerate and modify fine particles of sludge. The reduction of the moisture content of the filter residue after filtration mainly depends on the effect of the coagulant during the filtration period and the ratio of the filter aid added. The sludge treated by vacuum belt press filter and decanter centrifuge generally has a moisture content of about 80%, and the sludge treated by diaphragm press filter press has a moisture content of about 60-75%. The addition of the agent increases, the filtration speed increases, the moisture content of the filter residue decreases, and the pressure of the diaphra...

AI Technical Summary

Problems solved by technology

Judging from the actual situation of existing sludge dewatering technology and equipment use, the vacuum belt press filter and decanter centrifuge have a high degree of automation, but the moisture content of the filter residue is high, which cannot meet the requirements stipulated by the national environmental protection department.

Due to the restriction of the structure and material of the filter plate, the diaphragm press filter press has insurmountable obstacles in terms of temperature resistance and pressure resistance. From the analysis of filtration theory, the diaphragm press filter press is based on the principle of filter cake layer filtration. As the filtration time The extension of the filter cake, the thickening of the filter cake, the increase of the specific resistance of the filter cake, the decrease of the filtration rate, and the long filtration time

In addition, the membrane filter plate is complicated to manufacture, cumbersome to operate, has a short service life, and is expensive to replace. It also requires water and gas energy, and additional pipelines will increase operating costs.

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