A waste heat recovery and reuse system for papermaking production

CN122305847APending Publication Date: 2026-06-30ZHEJIANG JINGXING PAPER

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: ZHEJIANG JINGXING PAPER
Filing Date: 2026-04-07
Publication Date: 2026-06-30

AI Technical Summary

Technical Problem

In existing technologies, waste heat recovery efficiency in papermaking is low, waste heat utilization is insufficient, resulting in high production costs and reduced equipment heat transfer coefficient.

Method used

A multi-stage waste heat recovery system is adopted, including a first gas-liquid separation chamber, a first gas-to-gas heat exchanger, a second gas-liquid separation chamber, and a second gas-to-gas heat exchanger. Combining gas-liquid separation, spray pretreatment, and multi-stage heat exchange, it uses humid waste gas, turbine fan exhaust steam, and condensate as heat sources to heat fresh air in stages, and achieves precise regulation and protection through a control module.

Benefits of technology

It significantly improves waste heat recovery efficiency, reduces steam consumption, saves production costs, extends equipment life, and ensures system stability and reliability.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN122305847A_ABST

Patent Text Reader

Abstract

This invention relates to the field of pulp and paper technology, specifically providing a waste heat recovery and reuse system for paper production. The system includes a first gas-liquid separation chamber, an exhaust fan, a first gas-to-gas heat exchanger, a second gas-liquid separation chamber, an exhaust fan, and a second gas-to-gas heat exchanger. It also includes a control unit, which comprises a dew point control module, a temperature cascade control module, a differential pressure monitoring module, a final temperature control module, and an interlock control module. This invention fundamentally solves the efficiency degradation problem caused by condensation in heat exchangers through source pretreatment and dew point monitoring. Furthermore, it innovatively integrates the recovery of three types of waste heat: drying exhaust gas, turbine tail steam, and condensate, and performs three-stage cascade heating of fresh air to maximize energy recovery. Combined with intelligent control strategies, it can ensure process temperature while minimizing system steam consumption, significantly reducing enterprise energy consumption and operating costs.

Need to check novelty before this filing date? Find Prior Art