Chemical pulp grinding and steam recovery method and system

By using a grinding steam ejector and steam header in the grinding steam recovery system, the grinding steam is pressurized and diverted to the first-effect and forced-effect evaporators for a single heat exchange, which solves the problem of scaling in the intermediate-effect evaporator, improves the recovery efficiency and capacity of grinding steam, and reduces production costs.

CN115708961BActive Publication Date: 2026-07-17GUANGXI JINGUI PULP PAPER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGXI JINGUI PULP PAPER
Filing Date
2022-11-07
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In the existing technology, the direct injection of grinding steam into the intermediate-efficiency evaporator leads to severe fiber scaling and has a limited capacity, resulting in unsatisfactory grinding steam recovery.

Method used

The grinding steam ejector and steam header are used to pressurize the grinding steam and then enter the first-effect evaporator and the forced-effect evaporator through the steam header for one round of heat exchange. The steam that has not been fully heat-exchanged then enters the intermediate-effect evaporator for multiple rounds of heat exchange, thus avoiding scaling in the intermediate-effect evaporator.

Benefits of technology

It effectively reduces fiber scale problems in intermediate efficiency evaporators, improves the recovery effect and capacity of grinding steam, reduces production costs, and extends the fiber scale cleaning cycle.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a chemical pulp grinding steam recovery method and system. The chemical pulp grinding steam recovery system comprises a grinding steam conveying pipeline, a grinding steam ejector, a primary evaporation tank and a forced evaporation tank; the grinding steam ejector comprises a first input end connected with an output port, receives grinding steam to be recovered and pressurizes the grinding steam; the primary evaporation tank and the forced evaporation tank are connected with the output end of the grinding steam ejector through a steam header, and the pressurized grinding steam is input into the primary evaporation tank and the forced evaporation tank through the steam header to exchange heat and then condense. The design makes the grinding steam to be recovered not directly sent into the intermediate evaporation tank for heat exchange, but pressurized through the grinding steam ejector, enters the primary evaporation tank and the forced evaporation tank through the steam header for the first round of heat exchange, thereby avoiding the problems that the intermediate evaporation tank is seriously covered with fiber scale and the load of the grinding steam is limited.
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