Reverse Pulse Filter Cleaning with Exhaust Port Cut-Off Plunger
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Solution Overview
Problem
Conventional reverse pulse filter cleaning systems in fluid bed processing equipment are often ineffective due to continuous air flow from the process vessel to the exhaust plenum, which hampers the cleaning process by creating a large pressure differential that reduces the venturi effect and prevents effective dislodging of particulate matter from the filter.
Innovation Solution
A reverse pulse air filter cleaning system that includes a nozzle with larger and smaller diameter discharge holes and an annular exhaust port cut-off plunger to temporarily seal the exhaust plenum during the cleaning cycle, allowing compressed air to effectively dislodge particulate matter from the filter without competing with the continuous air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous air flow is maintained from process vessel to exhaust plenum, then processing operation continues uninterrupted, but reverse pulse cleaning effectiveness is reduced due to large pressure differential
Solution Approach 1:
The system dynamically switches between continuous processing mode and cleaning mode by actuating the exhaust port cut-off plunger. During normal operation, the plunger is retracted allowing continuous air flow. During cleaning cycles, the plunger moves to seal the exhaust port, dynamically changing the system state to enable effective reverse pulse cleaning without compromising continuous operation capability.
Solution Approach 2:
The system implements periodic cleaning cycles interspersed with continuous processing operation. The exhaust port cut-off plunger is actuated at predetermined intervals to seal the exhaust port during cleaning cycles, allowing periodic reverse pulse air pulses to effectively clean the filter element while maintaining overall continuous processing productivity.
2Force
If compressed air pressure is increased to overcome large pressure differential, then cleaning force is improved, but energy consumption and system complexity increase
Solution Approach 1:
The exhaust port cut-off plunger extracts or removes the continuous exhaust flow path during cleaning cycles by sealing the exhaust port. This isolation allows the compressed air pulse to concentrate its full force on dislodging particulate from the filter without being dissipated by continuous exhaust flow, thereby improving cleaning force without requiring excessively high compressed air pressures.
Solution Approach 2:
The exhaust port cut-off plunger acts as an intermediary mechanism that temporarily blocks the exhaust path during cleaning cycles. This intermediary seal enables the compressed air pulse to build sufficient pressure differential to overcome the normal operating pressure differential, effectively transmitting cleaning force to the filter element without requiring continuously high energy input.
3Reliability
If exhaust port is sealed during cleaning cycle, then reverse pulse cleaning effectiveness is improved, but processing operation is interrupted
Solution Approach 1:
The exhaust port cut-off plunger is actuated periodically at predetermined intervals rather than continuously. This periodic sealing of the exhaust port during brief cleaning cycles allows effective filter cleaning while minimizing interruption to the overall processing operation. The system alternates between processing mode (plunger retracted) and cleaning mode (plunger sealed), maintaining productivity while ensuring reliable cleaning.
Solution Approach 2:
The system dynamically transitions between processing and cleaning states through the exhaust port cut-off plunger actuation. During normal operation, the plunger remains retracted maintaining continuous processing. Upon cleaning requirement, the plunger dynamically moves to seal the exhaust port, enabling cleaning mode. After cleaning, the plunger returns to retracted position, restoring processing mode. This dynamic switching minimizes operational interruption while ensuring cleaning effectiveness.
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
The system ensures reliable and uniform cleaning of the filter element by interrupting the air flow from the process vessel to the exhaust plenum, enhancing the effectiveness of the reverse pulse cleaning method even at lower pressures, thereby maintaining efficient operation.
Implementation Method 1
a pulse of air is released from the compressed air source 18 and travels down the nozzle 16 toward the retaining filter 11. The burst of compressed air temporarily reverses the flow of air from the process vessel 12 to the exhaust plenum 15
Implementation Method 2
A venturi effect 19 occurs if the nozzle 16 is properly positioned for also drawing air from the exhaust plenum into the process vessel along with the compressed air
Implementation Method 3
This large pressure differential hinders the venturi effect that draws air from the exhaust plenum and reduces the effectiveness of the air pulse
Data Source
AI summary
A powder processing system having a processing vessel into which powder is pneumatically supplied and an exhaust plenum that communicates with the processing vessel through an exhaust port. A filter is located at the exhaust port for filtering air borne powder from the air flow exiting the processing vessel, and a reverse pulse air filtering device is provided for selectively removing accumulated powder from the filter. The cleaning device includes a nozzle having a first portion within the air plenum and a second portion within the air filter, and a plunger is mounted on the first filter portion for movement to an exhaust port closing position as an incident to the direction of pressurized air through the first portion of the nozzle for enabling pressurized air from the second portion of the nozzle to thereupon be directed through the filter without hindrance of air exiting the processing vessel.