Medium-consistency beating device and method using medium-consistency pump for feeding

Abstract

The invention discloses a device and method for medium-concentration beating fed through a medium-concentration pulp pump. A feeding port of a medium-concentration dual-net water extractor of the device is connected with a pulp feeding pipe and a discharging port is connected with a feeding port of a breaking screw conveyer; a discharging port of the breaking screw conveyer is connected with a feeding port of a vertical pipe and a discharging port of the vertical pipe is connected with a feeding port of the medium-concentration pulp pump; the feeding end of a buffer pipe is connected with a discharging port of the medium-concentration pulp pump through a pulp discharging pipe of the medium-concentration pulp pump and the discharging end of the buffer pipe is connected with a feeding port of a medium-concentration disc mill; an overflow pipe is connected with an overflow port in the buffer pipe; a discharging port of the medium-concentration disc mill is connected with the pulp discharging pipe; a water inlet of a water seal tank is connected with a white water groove outlet of the medium-concentration dual-net water extractor through a pipeline. According to the device and method, the flow and the concentration of low-concentration paper pulp in the pulp feeding pipe are adjusted and controlled, so that it is guaranteed that the liquid level and the concentration of paper pulp in the vertical pipe in front of the medium-concentration pulp pump are stable, and it is effectively guaranteed that the beating quality and the beating effect of the medium-concentration disc mill are stable.

Description

technical field [0001] The invention relates to a beating technology for pulping and papermaking, in particular to a medium-consistency beating device and method that adopts a medium-consistency pump to feed material. Background technique [0002] Medium-consistency disc refiners have been widely used in my country's paper mills in recent years, and maintaining the stability of the concentration and flow of pulp entering the medium-consistency disc refiner has an important impact on obtaining a good beating effect. When pulp of a certain concentration enters the medium-consistency disc refiner for beating, if the motor power of the medium-consistency disc refiner and the flow rate of the pulp are maintained within a set allowable variation range during the beating process, or the medium-consistency disc If the ratio of the power of the mill motor to the pulp flow rate is maintained within a set allowable range of variation, it can ensure that the medium-consistency disc refi...

AI Technical Summary

Problems solved by technology

However, in actual production, it was found that the pulp output by the medium-consistency pump is a pulsating flow, and the pressure and flow of the pulp fluctuate greatly, which has a negative impact on the normal work of the disc refiner.

On the other hand, when the working conditions in production are unstable, the pulp concentration also fluctuates to a certain extent

When there are large fluctuations in the pressure, flow and concentration of the pulp passing through the grinding zone of the medium-consistency disc refiner, the medium-consistency disc refiner cannot be beaten at a stable beating intensity, and the refining process is difficult to control, resulting in the quality of the pulp and the quality of the pulp. Instability of pulp effect

[0003] Chinese invention patent application 201010522397.2 provides a medium-consistency beating pumping method. By adjusting the white water regulating valve on the white water pipeline, white water is added to the medium-concentration standpipe to dilute the dehydrated and concentrated pulp to make it When the concentration reaches the set value, a medium-concentration slurry is formed; because the fluidity of the medium-concentration slurry is very poor, it is difficult to mix the medium-concentration slurry and the added white water evenly, and there is no stirring device in the medium-concentration standpipe, it is inevitable The concentration of the medium-consistency pulp output by the medium-consistency pulp pump is unstable, which affects the beating effect

Although the method provided by Chinese invention patent application 201010522397.2 has adjusted the pulp pressure and pulp flow pulsation between the medium-consistency pump and the medium-consistency disc refiner to a certain extent; however, pulp is an incompressible fluid, and the capacity of the buffer is limited, and there is no overflow device on the pipeline between the medium-consistency pulp pump and the medium-consistency disc refiner, so the pulp flow and pressure through the buffer still fluctuate to a certain extent; while the buffer and the medium-consistency disc refiner The pipelines between them and the slurry regulating valves installed on the pipelines expand the pressure and flow fluctuations of the pulp before entering the medium-consistency disc refiner, which affects the stability of the beating effect; in addition, the medium-consistency pulp pump and the medium-consistency disc There is no overflow device on the pipeline between the mills, and the pulp flow into the disc refiner can only be realized by controlling the opening of the valve on the medium-consistency pump discharge pipeline. Therefore, it is necessary to frequently adjust the medium-consistency pump pulp The valves on the pipes meet the pulp flow requirements of the medium consistency disc refiner, which amplifies the pulp flow and pressure pulsation

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