Radiation Inspection Device for Cellulose Pulp Dryer Web Positioning
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Solution Overview
Problem
Cellulose pulp dryers face inefficiencies due to frequent shutdowns and web tearing, leading to costly and time-consuming threading processes, as well as production stoppages caused by web residues left inside the dryer.
Innovation Solution
A method and device for inspecting the drying sections of a cellulose pulp dryer using low divergence radiation, such as laser or IR light, to accurately monitor the position of the web and detect residues, enabling efficient web edge control and residue removal before restarting the dryer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequent shutdowns and web tearing occur during dryer operation, then production interruptions and threading procedures increase, but operational efficiency and productivity decrease
Solution Approach 1:
The radiation detection system performs preliminary inspection of the drying section to detect web residues before they cause shutdowns or threading issues. By detecting residues early during normal operation, the system prevents production interruptions and enables proactive web positioning adjustments, thereby maintaining continuous productivity without downtime losses.
Solution Approach 2:
The system continuously monitors the drying section using radiation detection and provides real-time feedback on web position and residue occurrence. This feedback loop enables immediate corrective actions such as adjusting web position or alerting operators to remove residues, preventing the conditions that lead to shutdowns and threading procedures, thus preserving operational efficiency.
2Reliability
If web residues are left inside the dryer during stoppages, then threading of new web may be unsuccessful, but frequent inspection and cleaning increase operational complexity
Solution Approach 1:
The patent replaces complex mechanical inspection systems with a radiation-based detection system. Instead of using physical sensors or cameras that require direct contact or close proximity to the web, the system uses radiation (such as gamma rays or X-rays) that can penetrate the dryer structure and detect residues remotely. This substitution reduces mechanical complexity while improving reliability in detecting web residues that could interfere with threading operations.
3Productivity
If web edge position is not monitored during operation, then web may get stuck and cause stoppage, but implementing monitoring systems increases device complexity
Solution Approach 1:
The radiation detection system serves multiple functions simultaneously: it detects web residues, monitors web edge position, and provides information for both quality control and operational continuity. This multi-functionality allows a single system to prevent both residue-related threading failures and web-edge-related stoppages, maintaining productivity without proportionally increasing device complexity.
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
This solution reduces downtime by accurately localizing web residues and maintaining web position, preventing stoppages and ensuring successful threading, thus enhancing operational efficiency and reducing costs.
Implementation Method 1
A first low divergence radiation emitting device in the form of a first laser emitting device (30) is arranged
Implementation Method 2
Examples of low divergence radiation include laser, IR-light or sonar radiation
Implementation Method 3
detecting reflection of emitted low divergence radiation
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
A gas blowing cellulose pulp dryer (1) is operative for drying a web (14) of cellulose pulp by means of gas supplied from gas outlets (24) of blow boxes (22, 26) of a first drying section (5). The cellulose pulp dryer (1) comprises an inspection device (52, 152) having at least a first radiation sensor (35, 135) arranged to detect reflected radiation at the first drying section (5) to detect at least one of a position of the web (14) during operation of the dryer (1), and the occurrence of any residue (48) of the web (14).