Dual Injector Dust Removal for Large Diameter Bag Filters
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Solution Overview
Problem
Conventional dust removing devices for bag filters are inadequate for large diameter and long bag filters due to limited air pulse arrival range and increased pressure loss from thick dust layers, making them inefficient and space-intensive.
Innovation Solution
A dust removing device employing dual injectors with different diameters vertically arranged on the same axis, where the second injector amplifies air and injects it into the center of the first injector, enhancing the air pulse's pressure, volume, and arrival distance, and includes features like doughnut-shaped body parts, cylindrical induction pipes, and Coanda faces to optimize dust removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional single injector is used for dust removal, then the device structure is simple, but the air pulse arrival distance is short and cannot effectively reach large diameter and long bag filters
Solution Approach 1:
The single injector is divided into two separate injectors (first injector and second injector) arranged vertically. The first injector is positioned to inject compressed air at the upper portion of the bag filter, while the second injector is positioned lower to inject compressed air at the lower portion. This segmentation allows the air pulse to travel the full length of long bag filters by having multiple injection points along the vertical axis, thereby extending the effective arrival distance without requiring an excessively large single injector structure.
Solution Approach 2:
The solution transitions from a single-point injection (one-dimensional) to a multi-point vertical arrangement (three-dimensional). By positioning the two injectors at different vertical heights along the bag filter's length, the system creates a spatial distribution of air pulse injection points. This dimensional change allows compressed air to be delivered effectively to both upper and lower portions of long bag filters, extending the arrival distance in the vertical dimension.
2Area of stationary object
If the diameter of the bag filter is increased to reduce installation area, then space efficiency is improved, but the conventional dust removing device becomes inadequate due to limited air pulse arrival range
Solution Approach 1:
To address large diameter bag filters, the system uses two injectors positioned at different radial locations. The first injector is positioned to target the upper portion while the second injector targets the lower portion. This segmentation of the injection function allows compressed air to reach across the large diameter of the expanded bag filter, maintaining dust removal effectiveness despite the increased filter size and reduced installation area.
Solution Approach 2:
Each injector is optimized for its specific position and function. The first injector is configured with specific nozzle characteristics for upper portion injection, while the second injector has different nozzle characteristics suited for lower portion injection. This local optimization of injection parameters at different positions enables effective dust removal across the entire large diameter surface of the bag filter.
3Force
If compressed air is injected to remove dust from large diameter bag filters, then dust removal force is required, but pressure loss increases due to thick dust layers
Solution Approach 1:
The system uses periodic pulsed injection of compressed air through the two injectors rather than continuous injection. This periodic action creates strong instantaneous air pulses that effectively remove thick dust layers while minimizing overall energy consumption. The pulsed nature allows the system to build up sufficient pressure for strong dust removing force only when needed, reducing pressure loss during non-injection periods.
Solution Approach 2:
By distributing the injection function across two vertically separated injectors, the system reduces the pressure burden on each individual injector. Each injector only needs to generate sufficient pressure for its local zone rather than the entire bag filter length, thereby reducing overall pressure loss while maintaining adequate dust removing force across the large diameter surface.
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 dual injector system provides a stronger dust removing force with a wider and more uniform air pulse, effectively addressing the limitations of conventional devices for larger and longer bag filters, while optimizing space efficiency and reducing installation costs.
Implementation Method 1
jets strong compressed air to the bag filter 4 at appropriate time intervals, induces the directly jet compressed air and amplified air involved around the bag filter by high speed jet into the bag filter 4
Implementation Method 2
Korean Patent Publication No. 2001-0033657 (published on Apr. 25, 2001) discloses a 'Coanda injector and compressed gas line for connecting the Coanda injector'
Implementation Method 3
a first injector for amplifying the compressed air received from the compressed air pipe to inject the amplified air to the bag filter; and a second injector arranged above the first injector on the same axis to be spaced apart from the first injector and amplifying the compressed air
Data Source
AI summary
A dust removing device for a long bag filter having a large diameter employs a method of injecting amplified air through a dual injector having two injectors vertically arranged on the same axis to exhibit a stronger dust removing force than a conventional bag filter dust removing device, and is thus applicable to a bag filter having relatively a large diameter and a long length.