Fluidized Bed Blockage Detection via Temperature Differential
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Solution Overview
Problem
Fluidized bed apparatuses often experience blockages due to insufficient fluidization, leading to production downtime and reduced efficiency, as blockages are not immediately visible and can be difficult to detect.
Innovation Solution
Installation of temperature sensors below and above the distribution tray, connected to an evaluation device that compares temperature differences to detect impending blockages, allowing for early intervention in process control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operators reduce output to maintain safety reserves against blockage, then reliability is improved, but productivity deteriorates
Solution Approach 1:
The temperature sensors detect temperature changes that precede blockage formation, allowing operators to take preliminary actions (adjusting fluidization parameters) before the blockage actually occurs. This early detection eliminates the need for reduced output operation, as the system can maintain normal productivity while preventing blockages through timely interventions.
Solution Approach 2:
The evaluation device continuously monitors temperature differences and provides feedback to the control system. This real-time feedback enables dynamic adjustment of operating parameters to maintain optimal fluidization conditions, preventing blockages while maximizing productivity without requiring safety reserves in output.
2Reliability
If operators reduce output to prevent blockage, then blockage occurrence is reduced, but production efficiency deteriorates
Solution Approach 1:
By detecting temperature changes that precede blockage, the system enables preliminary corrective actions to be taken before blockage occurs. This allows the system to operate at full efficiency without needing to maintain reduced output as a safety measure, thus resolving the contradiction between blockage prevention and production efficiency.
Solution Approach 2:
Continuous temperature monitoring and evaluation provide real-time feedback on fluidization quality, enabling operators to maintain optimal conditions for both blockage prevention and high productivity simultaneously, rather than having to compromise efficiency for safety margins.
3Device complexity
If traditional detection methods are used, then device complexity is low, but measurement precision deteriorates
Solution Approach 1:
The patent uses temperature as an intermediary parameter to detect blockage conditions. Rather than directly observing blockage (which would require complex imaging or inspection systems), the temperature difference between regions serves as a sensitive indicator of impending blockage, achieving high measurement precision with relatively simple temperature sensors.
Solution Approach 2:
The invention replaces direct mechanical or visual inspection methods with thermal field measurement. By substituting temperature sensing for direct blockage detection, the system achieves superior measurement precision while maintaining low device complexity, as temperature sensors are simple and inexpensive compared to imaging or mechanical inspection systems.
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
Enables early detection of impending blockages, allowing for proactive adjustments to prevent blockages and maintain efficient operation, with the temperature difference measurement being more precise than other methods.
Implementation Method 1
a first temperature sensor is arranged below the distribution tray, that a second temperature sensor is arranged above the distribution tray directly on the distribution tray or in the lowest area of the fluidized bed
Implementation Method 2
sugar particles or other small particles to be processed during production are first fed in and then in a fluidized bed process these fed particles are fluidized in a continuous flow by air impingement from below. The particles are thus lifted by the inflowing air and kept in this state
Data Source
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AI summary
Fluidized bed apparatus: comprises a distribution base (10); a fluidization medium (11), which flows downwardly through the distribution base; a feeding arrangement, with which the particles (31) are supplied to a region above the distribution base, where a fluidized bed (30) of particles and the fluidization medium is formed above the distribution base; a first temperature sensor (41), which is arranged below the distribution base; a second temperature sensor, which is arranged above the distribution base; and an evaluation device. : Fluidized bed apparatus: comprises a distribution base (10); a fluidization medium (11), which flows downwardly through the distribution base; a feeding arrangement, with which the particles (31) are supplied to a region above the distribution base, where a fluidized bed (30) of particles and the fluidization medium is formed above the distribution base; a first temperature sensor (41), which is arranged below the distribution base; a second temperature sensor, which is arranged above the distribution base directly on the distribution base or in the lowest region of a fluidized bed; and an evaluation device, which is connected with the two temperature sensors. The evaluation device provides a signal for process control depending on the difference of temperatures measured from the two temperature sensors. An independent claim is also included for operating the fluidized bed apparatus, comprising supplying the particles via the distribution base through which the fluidization medium flows downwardly so that the fluidized bed is formed, where temperatures below and directly above the distribution base are respectively measured, and the measured temperature values below and above the distribution base are compared with each other and action is taken on the process control depending on the time course of the comparative value. USE : Used as a fluidized bed apparatus. ADVANTAGE : The fluidized bed apparatus counteracts the occurrence of blockages. DESCRIPTION OF DRAWINGS : The figure 1 shows schematic representation of the fluidized bed apparatus. 10 : Distribution base 11 : Fluidization medium 30 : Fluidized bed 31 : Particles 41 : First temperature sensor INSTRUMENTATION AND TESTING : Preferred Components: Many temperature sensors are arranged above the distribution base in different surface regions (sections) of the distribution base. Many temperature sensors are connected with the evaluation device and allow a section dependent signal evaluation. The temperature sensors are arranged above the distribution base at a distance of less than 5 mm above the distribution base. The limiting values are stored in the evaluation device, which induce an active change in process control during their crossing.