Cyclonic Separator Drying Damp Material in Pneumatic Conveying
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Solution Overview
Problem
Pneumatic conveying systems face blockages due to small quantities of damp material, particularly in blast furnace coal injection systems, and oversized materials like rocks and debris, which cause disruptions and are difficult to manage with existing solutions like vibratory screens and static filters.
Innovation Solution
A cyclonic separator and drier apparatus with a tubular filter element and annular internal channel that uses cyclonic action to dry damp material and separate oversized particles, preventing blockages by circulating damp material to the periphery for drying and entraining dry material in the gas flow, while oversized particles are trapped outside the filter element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vibratory screen is installed to remove damp material, then blockages are prevented, but device complexity and maintenance increase
Solution Approach 1:
The harmful damp material is extracted from the pneumatic stream using a centrifugal separator, isolating it from the main flow without requiring complex screening mechanisms. The separator extracts only the problematic damp clumps while allowing dry material to pass through normally.
Solution Approach 2:
The mechanical vibratory screening system is replaced with a centrifugal separation system that uses rotational force and airflow dynamics to separate damp material. This substitution eliminates the need for mechanical screens and associated cleaning mechanisms.
2Reliability
If a static filter is installed to catch damp material, then blockages are prevented, but the filter element becomes clogged and requires manual clearing
Solution Approach 1:
The centrifugal separator is designed to self-clean by using the same centrifugal force and airflow that separate damp material to automatically clear any accumulated material from the separation surfaces. The system maintains itself without requiring manual intervention.
Solution Approach 2:
The system uses dynamic centrifugal force generated by rotation to continuously clear material from separation surfaces. The rotating airflow prevents material accumulation that would otherwise require manual clearing, making the system dynamically self-maintaining.
3Reliability
If a vibratory screen and rotary valve are installed, then damp material is removed, but power consumption increases
Solution Approach 1:
The high-power mechanical vibratory screen and rotary valve system is replaced with a centrifugal separator that uses the existing pneumatic airflow to generate separating force. The system leverages the kinetic energy already present in the conveying stream rather than requiring additional high-power mechanical drivers.
Solution Approach 2:
The separation mechanism is achieved entirely through pneumatic means - using the transport gas flow itself to create centrifugal separation. This eliminates the need for mechanical screening and valve systems that would require significant electrical power input.
4Reliability
If a vibratory screen is installed, then damp material is removed, but the screen deck becomes blinded and requires frequent cleaning
Solution Approach 1:
The centrifugal separator extracts damp material from the pneumatic stream before it can accumulate and blind any filtering surfaces. By removing the problematic material early in the process, the system eliminates the need for frequent screen cleaning.
Solution Approach 2:
The separator design allows automatic clearing of separated material through continuous centrifugal action and airflow, preventing material buildup that would require manual cleaning operations.
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
Effectively prevents pipe blockages by drying damp material and separating oversized particles, reducing maintenance and operational complexities, and allowing continuous operation with improved efficiency and reduced material loss.
Implementation Method 1
damp material thrown to the periphery of the casing due to cyclonic action
Implementation Method 2
damp material thrown to the periphery of the casing due to cyclonic action
Implementation Method 3
finer dried material is capable of becoming entrained in transport gas flow and drawn towards the centre of the casing wherein the dried material passes through the filter element
Data Source
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AI summary
There is herein described apparatus for drying material or for conveying material. More particularly, the present invention relates to apparatus for drying conveyed material such as pneumatically conveyed material or for conveying oversized material.