A kind of vacuum belt type alkali filter alkali filter process

Abstract

The invention provides an alkali filtering process of a vacuum alkali filtering machine. The alkali filtering process of the vacuum alkali filtering machine comprises three areas, including a water filtering area, a washing area and a drying area which are arranged on the alkali filtering machine; a vacuum area of equipment is a segmented vacuum area; the water filtering area and the washing area adopt one same vacuum area; the drying area is an independent vacuum area; the water filtering area and the washing area adopt a water-ring vacuum pump as a negative pressure source, and the negative pressure value is 0.045 to 0.07 MPa; the drying area adopts a vacuum machine as a negative pressure source, and the negative pressure value is 0.045 to 0.05 MPa. According to the alkali filtering process of the vacuum alkali filtering machine, the vacuum consumption is low, the vacuum equivalent is reduced from original 630 m<3> / T to 460 m<3> / T, and the energy consumption is low; the moisture of a filtered material is reduced, and the moisture is reduced from original 17 percent to 15 percent; the filtering loss is reduced, and the filtering loss is reduced from original 1.85 percent to 1.7 percent; the washing water equivalent is reduced, and the washing water equivalent is reduced from original 0.67 m<3> / T to 0.57 m<3> / T.

Description

technical field [0001] The invention relates to the field of mechanical equipment, in particular to an alkali filter equipment, in particular to a vacuum belt type chlor-alkali machine alkali filter process. Background technique [0002] As we all know, the filtration process of the alkali industry is one of the key processes in the production process. The performance and operation of the equipment have a great impact on the output, quality, material consumption, and energy consumption. The main filtration equipment is a drum filter. , with the maturity of the vacuum belt filter technology, it has the advantages of stable operation, small washing water volume, and low filtered water, and has gradually replaced the drum filter. However, this technology has been monopolized by foreign countries. Huaian Soda Factory, Tianjin Soda Factory, The southern lye all adopts foreign products, but its gas consumption is huge and energy consumption is high, resulting in that the economic ...

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Problems solved by technology

[0004] The vacuum belt alkali filter machine is generally divided into water filtration area, washing area and drying area when it is working. The material is evenly distributed on the filter cloth of the belt filter through the distributor, and the mother liquor is separated from the material through the filtering water area, and the mother liquor is passed through the liquid discharge tank. After the material enters the washing area, the impurities are removed by two washing waters, the washing water is drained through the drain tank, and the material enters the drying area to fully reduce the moisture before unloading. In the past, the three areas of the equipment used one Vacuum pump filtration, because the material needs to be washed after passing through the filtered water area, so the material does not need to be too low in moisture, and the water in the washing area is washed twice during the washing process, and the water does not need to be too low, so the filtering area and the washing area only use most of the water It can be filtered away, and there is no need to use air volume for drying. If the two ends are filtered with air volume, unnecessary air volume will be wasted, and the final result of reducing the moisture content of the material will not be achieved. Therefore, the current vacuum belt filter The equipment still has the following disadvantages: relatively large vacuum consumption, high energy consumption; relatively large filtration loss, high moisture in the filtered material; large washing water consumption

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