Rotating Horizontal Digester for Gas-Liquid-Solid Mixing
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Solution Overview
Problem
Existing horizontal digesters in the paper manufacturing industry suffer from low efficiency in continuous cooking and gas-liquid-solid mixing, leading to unsatisfactory slurry production, particularly when handling oxygen-alkali materials, due to inefficient mixing and high energy consumption.
Innovation Solution
A continuous horizontal digester with a rotatable cylindrical pressure cooker, a two-part charging device, and a discharging device, equipped with a feed screw, sealing mechanism, and a cooking device that allows for high-temperature and high-pressure steam input, enhancing mixing and cooking efficiency by rotating along its central axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a spherical pot is used for horizontal intermittent cooking, then the cooking process can be completed, but the mixing efficiency of gas-liquid-solid is poor and the cooking efficiency is low
Solution Approach 1:
The patent applies the dynamics principle by making the cooker rotatable around its central axis. The rotation mechanism transforms the static spherical pot into a dynamic system where the liquid-solid-gas mixture continuously changes position, enabling effective mixing during the cooking process while maintaining continuous operation capability
Solution Approach 2:
The charging device is divided into two separate parts: a fixed part connected to the charging opening and a rotatable part connected to the cooker interior. This segmentation allows the charging mechanism to remain stationary while the cooker rotates, solving the sealing problem and enabling continuous feeding during rotation
2Productivity
If horizontal tubes are arranged sequentially from top to bottom for continuous cooking, then continuous cooking can be achieved, but the building cost increases due to multiple floors and the power consumption increases due to independent power systems
Solution Approach 1:
The patent merges multiple functions into a single horizontal cylindrical cooker. Instead of using multiple separate horizontal tubes arranged vertically across different floors, one cooker performs continuous cooking through rotation, eliminating the need for multi-floor construction and reducing overall system complexity
Solution Approach 2:
The rotation of the cooker ensures continuous mixing and cooking action throughout the process. Material continuously moves through the cooking zone while the cooker rotates, maintaining uninterrupted useful action without requiring multiple sequential tubes
3Ease of operation
If augers are used in horizontal tubes to push slurry, then slurry can be moved in a fixed direction, but sufficient mixing cannot be provided and the system is not suitable for oxygen-alkali cooking
Solution Approach 1:
The system replaces the static auger pushing mechanism with a dynamic rotation system. The entire cooker rotates around its central axis, creating continuous dynamic mixing action that thoroughly mixes gas-liquid-solid components, making it suitable for oxygen-alkali cooking processes
4Productivity
If a rotatable cylindrical pressure cooker is used, then mixing and cooking efficiency is improved, but sealing during rotation becomes challenging
Solution Approach 1:
The charging device is segmented into a fixed stationary part and a rotatable part that rotates with the cooker. The sealing component is positioned at the interface between these two parts, allowing the rotatable part to rotate while maintaining a reliable seal with the fixed charging opening
Solution Approach 2:
A sealing component acts as an intermediary between the fixed charging device and the rotatable cooker. This sealing mechanism enables the transfer of material from the stationary charging opening to the rotating cooker while preventing gas leakage, solving the sealing challenge
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves improved mixing and cooking efficiency, preventing pressure leaks and excess water entry, resulting in enhanced slurry production quality and reduced energy consumption.
Implementation Method 1
a feed screw, sealing mechanism, and a cooking device that allows for high-temperature and high-pressure steam input
Implementation Method 2
a cooking device that allows for high-temperature and high-pressure steam input, enhancing mixing and cooking efficiency
Implementation Method 3
A continuous horizontal digester with a rotatable cylindrical pressure cooker... that allows for high-temperature and high-pressure steam input, enhancing mixing and cooking efficiency by rotating along its central axis
Implementation Method 4
a feed screw, sealing mechanism, and a cooking device that allows for high-temperature and high-pressure steam input
Data Source
AI summary
The instant disclosure provides a continuous horizontal digester including a cylindrical pressure cooker capable of rotating by taking its central axis as an axis; a charging apparatus disposed at one end of the cooker which is communicated with an inner cavity of the cooker and can seal the cooker; and a discharging device disposed at the other end of the cooker and communicated with the inner cavity of the cooker, the discharging device is located on the central axis of the cooker. The continuous horizontal digester further includes a cooking device configured to cook the materials in the cooker.