Liquid discharge control method of bleaching pulp system

Abstract

The invention belongs to the technical field of papermaking equipment, and particularly relates to a liquid discharge control method of a bleaching slurry system. The liquid discharge control method comprises the following steps that A, a liquid level sensor is arranged on the groove wall of a slurry tank in a bleaching slurry system; the liquid level sensor is arranged at a place with a level height warning value of K1; and the place with the level height warning value of K1 is close to the tank opening of the slurry tank; and B, a liquid pumping device is arranged on a drainage pipeline usedfor discharging filtrate in the slurry tank; the liquid level sensor collects the water level height information in the slurry tank, so that the water level height in the slurry tank is monitored; when the water level height in the slurry tank is greater than K1, the pump liquid device is started and the liquid is discharged from the slurry tank to outside; and when the water level height in theslurry tank is lower than or equal to K1, the liquid pumping device is in a standby state. According to the invention, a siphon drainage liquid can be timely established when the water level in the slurry tank is suitable; when the slurry flow is too large, the liquid pumping device can be started in time to assist liquid discharging, so that the waste of raw material and the break off of production caused by overflow of the slurry from the slurry tank are avoided; the washing and the concentration effects of the slurry are effectively ensured, so that the quality of the bleaching slurry operation is ensured.

Description

technical field [0001] The invention belongs to the technical field of papermaking equipment, and in particular relates to a liquid discharge control method of a pulp bleaching system. Background technique [0002] Bleaching pulp is an important process in papermaking and pulp pulping production, which is used to realize the bleaching and washing of pulp. Usually, bleaching agent is added to the slurry first, and after the slurry is bleached to meet the process requirements, washing water is added to fully wash the slurry, and then the mixed slurry is driven to flow through a flat screen, which is full of slurry flow channels , the papermaking fiber can still stay in the slurry after being intercepted by the filter screen, while the filtrate containing residual bleaching agent will pass through the filter screen and be discharged, thereby realizing the washing and concentration of the slurry. [0003] The filtrate can be discharged by using the principle of siphon, but the ...

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Problems solved by technology

[0003] The filtrate can be discharged by using the principle of siphon, but the water level in the pulp tank is affected by the progress of the pulp and bleaching liquid mixing operation, the pulp flow is not stable, if the water level in the pulp tank is too high, the siphon drainage will not be timely, and the slurry will be wasted if it overflows the pulp tank A large amount of raw materials even leads to production interruption; the water level in the stock tank drops below the water inlet of the siphon pipe, and the siphon drainage will be interrupted. Unable to continue operation, making slurry quality unable to meet production demand

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