Filtrate Sampling Device with Hole Screen for Pulp Fiber Clogging
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Solution Overview
Problem
Existing filtrate sampling devices in the pulp and paper industry face challenges in obtaining representative samples due to clogging by fibers, leading to production stops and increased maintenance needs.
Innovation Solution
A filtrate sampling device with a piston rod featuring a hole screen that forms a fibre layer to prevent fibre entry, allowing filtrate to pass while the fibre layer acts as a 'brush' for cleaning, reducing clogging and maintenance requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional filtrate sampling device is used, then the device structure is simple, but the device gets clogged by fibres leading to production stops and maintenance needs
Solution Approach 1:
The sampling device is divided into distinct functional segments: a sampling probe for obtaining filtrate samples, a fiber removal mechanism with rotating elements that actively separate and remove fibers, and a filtration system. This segmentation allows each component to perform its specific function efficiently, preventing clogging while maintaining operational continuity
Solution Approach 2:
The device incorporates dynamic elements including a rotating fiber removal mechanism with multiple rotating elements that actively agitate and separate fibers from the filtrate sample. This dynamic action prevents fiber accumulation and clogging, ensuring continuous operation without maintenance stops
2Reliability
If the sampling device operates in high temperature and pressure conditions, then representative samples can be obtained, but safety risks increase
Solution Approach 1:
The device uses an intermediary cooling mechanism where a cooling fluid circulates through channels in the sampling probe, acting as a thermal mediator between the high-temperature process environment and the sampling system. This allows the probe to withstand high temperatures while the sample and surrounding components remain at safe temperatures, reducing safety risks while maintaining sample representativeness
3Measurement precision
If the filtrate sampling device is installed to obtain representative samples, then the sample temperature must match process temperature, but the device may get clogged by fibres
Solution Approach 1:
The device performs preliminary fiber removal through the rotating fiber removal mechanism before the filtrate reaches the sampling point. This preliminary action eliminates fibers that would otherwise cause clogging, allowing the sampling device to maintain both temperature accuracy for representative samples and resistance to clogging through proactive fiber separation
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
Ensures a fibre-free filtrate sample for reliable chemical property determination, reducing production stops and maintenance needs by effectively preventing fibre clogging and facilitating easy cleaning of the device.
Implementation Method 1
a hole screen (120) arranged on the piston rod (110). The hole screen (120) comprises a number of holes (123) arranged in the piston rod (110). When the piston rod moves into the pulp solution, a fibre layer is formed over the hole screen and partly in the holes of the hole screen, preventing the fibres from entering the hole screen through the holes of the hole screen
Data Source
AI summary
A novel filtrate sampling device for collecting a filtrate sample from a pulp solution. The filtrate sampling device includes: a jacket, a piston rod including a first end and second end, the piston rod being arranged inside the said jacket in the longitudinal direction of the jacket, and a hole screen arranged on the piston rod. The hole screen includes a number of holes in the piston rod.