Method for conveying medium-concentration stuff and medium-concentration stuff pump system device for implementing same

Abstract

The invention provides a method for conveying medium-concentration stuff and a medium-concentration stuff pump system device for implementing the method. The method comprises the following steps that: mounting the medium-concentration stuff pump system device below a concentrator in a process flow of cleaning and bleaching medium-concentration paper stuff; and conveying the medium-concentration paper stuff into a bleaching tower device according to certain flow and pressure to perform bleaching by the medium-concentration stuff pump system device. The medium-concentration stuff pump system device comprises a medium-concentration standpipe, a turbulent flow generator, a centrifugal medium-concentration stuff pump, a three-phase separator, a vacuum pump and a connecting pipeline, wherein the turbulent flow generator is fixed at the bottom of the medium-concentration standpipe through an inlet flange; an output of the turbulent flow generator is connected with an inlet flange of the centrifugal medium-concentration stuff pump; a supporting base of the turbulent flow generator is connected with an air inlet pipe of the three-phase separator through a vacuum exhaust pipeline; and an exhaust pipe of the three-phase separator is connected with the vacuum pump. The method and the medium-concentration stuff pump system device can realize effective separation of a three-phase flow including stuff, air and water for the disassembly of a fiber network of the medium-concentration stuff and the fluidization of the medium-concentration stuff in favor of the continuous stable conveyance of the medium-concentration stuff pump.

Description

technical field [0001] The invention relates to the technical field of medium-consistency pulp cleaning and bleaching in the pulp and papermaking industry, in particular to a method for conveying medium-consistency pulp and a medium-consistency pulp pump system device. Background technique [0002] The two main sources of pollution in the pulp and paper industry are the pollution of black liquor produced by cooking and the pollution of bleaching wastewater. Among them, the pollution of bleaching wastewater is far more harmful than the pollution of cooking black liquor, and its toxicity is extremely high. Traditional low-concentration chlorine-containing CEH bleaching consumes a lot of chemicals such as chlorine, alkali and hypochlorite, and produces a large amount of toxic wastewater containing AOX. According to statistics, more than 100 cubic meters of toxic wastewater will be produced for every ton of CEH bleached pulp produced. With people's emphasis on environmental prot...

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Problems solved by technology

[0004] At present, the single-blade medium-consistency pump ZL95215788.8 and the turbulent-flow medium-consistency pump CN88201317U produced in China have unstable pulp delivery and large pressure fluctuations when conveying medium-consistency pulp with a concentration greater than 10%, and ECF bleaching and TCF bleaching cannot be realized. Concentrated pulp transportation in the medium-consistency clean bleaching technology process; when using a positive displacement single-screw pump to transport medium-concentrated pulp, due to the large friction coefficient between the pulp fiber and the screw rubber bushing, the screw bushing is easily damaged and the transportation fails. ; The medium consistency clean bleaching pulping production line introduced at home and abroad generally adopts the medium consistency pump system with horizontal turbulence from Sulzer or the medium consistency pump system with vertical conditioner from Andritz. The two medium-consistency slurry pump systems have a common disadvantage that the vacuum pump exhaust system is directly connected to the pump or conditioner through pipelines and valves, and the three-phase flow of slurry, water, and steam directly passes through the vacuum pump, and the impeller of the vacuum pump is easily damaged. Decrease or fail the vacuum degree, affecting the stable transportation of medium consistency pulp and the safe operation of medium consistency clean bleaching pulp production line

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