Continuous boiling method and its device for semi chemical mechanical slurry of long bast fiber raw material

Abstract

The present invention relates to continuous boiling method and apparatus of semi-chemical mechanical slurry of long bast fiber raw material. During the continuous boiling process, cell bunker rotor valve is used after continuous boiling pipe to exhaust the semi-slurry after being boiled to the distribution bunker in normal pressure, or semi-slurry debonding device is used to debond long bast and large slurry block in the semi-slurry and orifice plate exhaust valve is used to spray the semi-slurry into spraying bunker in normal pressure. Therefore, normal pressure slurry grinding machine may be then used in grinding slurry of the continuously boiled long bast fiber semi-slurry in relatively low cost. In addition, the normal pressure slurry grinding machine may be overhauled easily at normal pressure without need of stopping the whole continuous boiling apparatus.

Description

technical field [0001] The invention relates to a continuous cooking method and device for semi-chemical mechanical pulp of long bast fiber raw materials such as cotton stalks and kenaf in the papermaking industry. Background technique [0002] In the paper industry, the direct connection of horizontal tube continuous digester and pressure refiner has been used to produce semi-chemical mechanical pulp of cotton stalk, kenaf and other long bast fiber raw materials for many years. Since the grinding discs of the pressure refiner are easy to wear parts, they need to be replaced frequently during the production process. At this time, it is necessary to spray the slurry in the continuous digester to reduce the pressure first, then stop the whole line, and then replace the grinding discs or repair them. This will undoubtedly cause huge economic losses. In addition, since the pressure refiner requires pressure resistance, its structure is relatively complicated and expensive, and ...

AI Technical Summary

Problems solved by technology

Since the grinding discs of the pressure refiner are easy to wear parts, they need to be replaced frequently during the production process. At this time, it is necessary to spray the slurry in the continuous digester to reduce the pressure first, then stop the whole line, and then replace the grinding discs or repair them. This will undoubtedly cause huge economic losses

In addition, since the pressure refiner requires pressure resistance, its structure is relatively complicated and expensive, and many large pressure refiners still need to be imported. Therefore, many domestic paper mills hope to use domestic atmospheric pressure refiners for continuous The semi-slurry sprayed after cooking is refined, and this method has been applied in the production process of wheat straw semi-chemical mechanical pulp

However, for the semi-chemical mechanical pulp of long bast fiber raw materials such as cotton stalks and kenaf, due to the high hardness of this semi-slurry and a lot of long bast, if the method of spraying first is used to block the discharge valve, it will Affect the normal operation of the continuous digester

Therefore, a continuous cooking method and device for long bast fiber semi-chemical mechanical pulp with stable operation and easy maintenance of equipment have not been seen so far.

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