Pulse-jet Bag Filter Angled Inlet Channels Reduce Turbulence
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Solution Overview
Problem
Pulse-jet type bag filters face challenges with turbulence and size constraints due to high gas flow velocities, leading to filter bag deterioration and reduced production rates, while attempts to reduce turbulence often result in increased size or reduced flow rates.
Innovation Solution
A compact pulse-jet type bag filter assembly with a central housing axis and angled gas flow inlet channels that direct gas flow downward, reducing turbulence and allowing for a higher production rate without increasing the filter housing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high gas flow velocity is applied to suspend particles and prevent deposition, then particle suspension is improved, but turbulence increases leading to filter bag deterioration
Solution Approach 1:
The housing space is segmented into an upper housing space and a lower housing space by a top plate, with inlet channels specifically positioned to connect to the lower housing space. This segmentation allows controlled gas flow introduction that maintains particle suspension while reducing overall turbulence intensity throughout the filter assembly.
Solution Approach 2:
The inlet channels are oriented at angles between 45° and 90° relative to the vertical axis, introducing gas flow from a directional perspective rather than purely vertical input. This angular introduction method creates more uniform flow distribution and reduces turbulent eddies that would otherwise directly impact the filter bags.
2Reliability
If flow velocity is reduced to decrease turbulence, then filter bag durability is improved, but production rate decreases
Solution Approach 1:
The lower housing space acts as an intermediary chamber between the inlet channels and the filter bags in the upper housing space. Gas flow is introduced into this intermediate zone first, allowing velocity reduction and turbulence dissipation before gas reaches the filter bags, thereby maintaining both durability and productivity.
Solution Approach 2:
Gas flow is pre-conditioned in the lower housing space before entering the upper housing space where filter bags are located. The top plate and inlet channel configuration create a preliminary flow stabilization zone that reduces velocity and turbulence intensity before gas contacts the filter media, preserving both bag life and flow rate.
3Speed
If additional volume is added centrally within the bag filter to accommodate inlet structure, then inlet flow speed can be reduced, but device size increases
Solution Approach 1:
The housing is segmented into upper and lower spaces with the inlet structure confined to the lower housing space. This segmentation allows the inlet channels to be positioned peripherally rather than requiring central volume, achieving reduced inlet flow speed through optimized channel geometry and angular orientation without increasing overall device volume.
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 solution achieves reduced turbulence and improved filter bag longevity while maintaining a high production rate, allowing for a trade-off between size, turbulence, and flow rate, effectively addressing the limitations of prior art designs.
Implementation Method 1
a gas pulse injector (24) comprising a valve which is configured to release a pulse of pressurized gas into the upper housing space (10) and/or into the post-filtering subspace (18) for intermittently changing a gas pressure gradient at at least one of the plurality of filter bags (14)
Implementation Method 2
Pulse-jet type bag filters are known as such and comprise a plurality of filter bags suspended in a filter housing. Such filter bags tend to be relatively delicate and fragile, leading to deteriorations and faults such as wear and breaking, in particular under influence of turbulence inside the filter housing.
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
A pulse-jet type bag filter assembly for removing particles, in particular dried powder particles, from a flow of gas, the assembly comprising a plurality of gas flow inlet channels which are connected to a bag filter housing and each individually fluidly connected to a pre-filtering subspace at respective inlet connections which are spaced away from a central housing axis, wherein each inlet channel defines a respective inlet channel flow axis along which, in use, gas flows in the inlet channel, wherein at the respective inlet connection each inlet channel flow axis extends in a direction which includes an angle with the central housing axis in the range of 0° to 30°, preferably in the range of 0° to 20°, such that, in use, the inflow of gas with particles into the pre-filtering subspace is substantially downwardly directed.