Filtration system

Abstract

The invention discloses a filtration system. The filtration system is at least composed of a first booster pump, a first filter, a second booster pump, a second filter and a control unit which are connected in sequence; and the first filter is a double-column recoil type net replacing filter, the second filter is a melt automatic recoil type filter, and the control unit is connected with two pressure sensors located on the two sides of the first filter, pressure sensors located on the two sides of the second filter, the first booster pump, the first filter, the second booster pump and the second filter. The invention further discloses an operation technology of the filtration system. By means of the filtration system, automatic flushing of filtering nets of the second filter is achieved, when the differential pressure between a melt outlet and a melt inlet of the second filter is too large, the back washing process is automatically started, and the position and the movement distance ofa filter recoil shaft of the second filter are accurately controlled; and the line structural design is reasonable, the filtering pertinence of high-temperature melt is high, the filtering period islong, the filters are prevented from being frequently replaced, filtering is stable, and the filtering efficiency is high.

Description

technical field [0001] The invention belongs to the field of filtering equipment, and in particular relates to a filtering system suitable for high-temperature melts. Background technique [0002] At present, the filtration of materials is generally carried out in the form of single-filter filtration, which is not highly targeted and the filtration effect is not good. For example, in the production process of PET thermoplastic polyester, due to the gel formed at high temperature during the chemical reaction and the long-term thermal history. Impurities such as carbonization need to be removed, often involving a filtration process. Virgin polyester has a short thermal history and low impurity content, and the technical scheme of setting a candlestick filter before the final polycondensation is often adopted, while the production of recycled polyester mostly uses bottle flakes, waste silk, and waste textiles as raw materials, and the sources and components are complex. , the ...

AI Technical Summary

Problems solved by technology

[0002] At present, the filtration of materials is generally carried out in the form of single-filter filtration, which is not highly targeted and the filtration effect is not good. For example, in the production process of PET thermoplastic polyester, due to the gel formed at high temperature during the chemical reaction and the long-term thermal history. Impurities such as carbonization need to be removed, often involving a filtration process

Virgin polyester has a short thermal history and low impurity content, and the technical scheme of setting a candlestick filter before the final polycondensation is often adopted, while the production of recycled polyester mostly uses bottle flakes, waste silk, and waste textiles as raw materials, and the sources and components are complex. , the content of impurities is high, and the spinning oil, printing and dyeing auxiliaries and other ingredients in the raw materials are easy to cause polyester degradation, carbonization, and gel formation. If one-stage filtration is used, the service life of the filter will be extremely short and the replacement will be frequent. Therefore, The production of recycled polyester requires the design of multi-stage filtration

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