Sensor Channel Installation in Digester Vessel
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Solution Overview
Problem
Existing monitoring systems for pressurized vessels in the pulp and paper industry face challenges such as structural weaknesses, potential leaks, and inefficient data collection due to the need for multiple sensors installed on the exterior wall, which can be costly and dangerous to install at high elevations.
Innovation Solution
The solution involves installing sensor channels along the outer wall of a central pipe within the digester vessel, allowing for the placement of sensors and cables inside the vessel, thereby minimizing external openings and enabling real-time data collection of process conditions such as chip level, liquor level, temperature, and residual alkali concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors are installed on the exterior wall of the vessel at high elevations, then real-time monitoring of process conditions is achieved, but structural weaknesses and leakage risks increase
Solution Approach 1:
A central pipe system acts as an intermediary structure within the vessel, providing a platform for sensor installation that does not require multiple external wall penetrations. The central pipe extends vertically through the vessel, allowing sensors to be mounted at different elevations internally, thus maintaining vessel wall integrity while enabling comprehensive monitoring.
Solution Approach 2:
The solution transitions from a two-dimensional external wall mounting approach to a three-dimensional internal central pipe mounting approach. By utilizing the vertical dimension of the central pipe, sensors can be positioned at multiple elevations without requiring multiple horizontal openings in the vessel wall, thereby reducing structural weaknesses.
2Loss of information
If multiple sensors are installed on the exterior wall of the vessel, then comprehensive data collection is achieved, but the number of openings increases leading to higher leakage risks
Solution Approach 1:
The central pipe serves multiple functions: it acts as a structural support element, a platform for sensor installation, and a conduit for cable routing. This multi-functional approach eliminates the need for separate external mounting structures and multiple wall penetrations, thereby reducing leakage risks while maintaining comprehensive monitoring capabilities.
Solution Approach 2:
The sensor mounting function, cable routing function, and structural support function are merged into a single integrated central pipe system. This consolidation reduces the number of separate components and connections required, minimizing potential leakage points while achieving comprehensive data collection.
3Reliability
If sensors are installed on the exterior wall at high elevations, then monitoring coverage is improved, but installation and maintenance become more dangerous and costly
Solution Approach 1:
The central pipe structure and sensor mounting positions are pre-configured during vessel construction or installation. This preliminary preparation allows sensors to be easily attached at the correct elevations without requiring complex high-altitude installation procedures, thereby improving safety and reducing costs while maintaining comprehensive monitoring coverage.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
An arrangement for installations of monitoring sensors of a vessel 1 for treatment of lignocellulosic material, which vessel (1) has a central pipe (2) comprising at least one concentric pipe (3), which is mounted coaxially within the vessel (1).At least one sensor channel (4) is arranged along the outermost wall of the concentric pipe (3) of the central pipe (2) and that the at least one sensor channel (4) is connected to a cable conduit (5), which cable conduit (5) connects the exterior of the vessel (1) to the at least one sensor channel (4) ) and the sensor channel (4) is several meters long and has plurality of holders (13) for sensors (11) and/or is configured to contain plurality of thermal sensors (11) with their cables (8). An outer wall (6) of the sensor channel (4) may be a concentric pipe on the central pipe (2) or it is welded from both sides of the outer wall (6) onto the central pipe (2). The sensor channel (4) may contain subchannels (7). The sensor channel (4) may be pressurized and/or have means for evacuating leaked liquid from the bottom of the sensor channel (4). The sensor channel (4) may be thermally insulated from the center pipe (2).