Vacuum foam-removing system for black liquid

Abstract

A vacuum foam-removing system for black liquid generated by vacuum pulp washer is disclosed. Said black liquid comes in the inner drum of cyclone equipment in tangent direction. When the black liquidtank is full of the foams, the foams flow into foam-removing unit under the action of high-pressure blower. After the foam remover is used to eliminate the foams, the residual foams are blown into efficient cyclone remover where the foams are eliminated further. The less fine foams are finally eliminated by the cyclone foam remover. Its advantages are low energy consumption reduced by 80-90%, lownoise, and no pollution.

Description

Technical field: [0001] The invention relates to the field of environmental protection, more specifically to wastewater treatment, especially to the treatment of papermaking wastewater—black liquor. Background technique: [0002] The paper industry is closely related to the development of the national economy and the people's living standards and cultural and educational levels. Generally speaking, with the continuous improvement of living and cultural education levels, the amount of paper required is also increasing, and the requirements for its varieties and specifications are also getting higher and higher. The raw materials used in papermaking mainly include wood and grass. The more commonly used pulping method is alkaline pulping. This method is to first cut the wood or grass raw materials for papermaking into flakes or short sections, and send them to special cooking equipment. After adding a certain amount of caustic soda, it is cooked under high temperature and high...

AI Technical Summary

Problems solved by technology

This method can partially solve the leakage of the foam on the upper part of the black liquor storage tank, but because the effect of the black liquor defoamer is not ideal enough, it cannot fundamentally solve the problem of black liquor defoaming, and a large amount of black liquor foam discharged from the outlet of the vacuum pump still flows into the ditch, resulting in Environmental secondary pollution

In addition, the use of vacuum pumps requires a large amount of cooling water, high energy consumption, and high noise. Therefore, low-cost and efficient elimination of foam in black liquor has always been a key issue in the treatment of papermaking wastewater

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