Nested Sintered Metal Filter Tube for High Temperature Gas-Solid Separation
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Solution Overview
Problem
Existing high temperature gas-solid separation systems face limitations in filtration area, efficiency, and maintenance costs due to limited filtration capacity, backflow, and negative pressure regions during pulse-jet cleaning, which reduce the effectiveness and lifespan of sintered metal filter tubes.
Innovation Solution
A sintered metal filter tube design featuring a coaxially nested cylinder structure with an annular gas passage and a pulse-jet guiding device with spiral blades, facilitating rotational flow pulse-jet cleaning to enhance filtration area, reduce backflow, and prevent negative pressure regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single filter tube is used for high temperature gas-solid separation, then the structure is simple, but the filtration area is limited and filtration capacity is small
Solution Approach 1:
The patent applies nesting by placing a second cylinder inside the first cylinder, creating a nested cylindrical structure. The second cylinder's outer surface serves as an additional filtration surface, effectively increasing the total filtration area without significantly increasing the overall device volume or complexity. This nested configuration allows the filter tube to achieve larger filtration capacity while maintaining structural simplicity.
2Productivity
If pulse-jet cleaning is used to remove dust from filter tube, then the filter performance is restored, but backflow occurs and negative pressure regions are formed reducing cleaning effectiveness
Solution Approach 1:
The patent introduces a guiding cone with a curved streamline shape at the top of the second cylinder. This curved geometry guides the pulse-jet gas flow along a smooth path, reducing turbulence and preventing the formation of negative pressure regions. The streamlined design of the guiding cone effectively controls the gas flow direction, minimizing backflow and improving the overall effectiveness of the pulse-jet cleaning process.
Solution Approach 2:
The guiding cone acts as an intermediary element between the pulse-jet gas source and the filter tube interior. It mediates the gas flow by directing it along the annular gas passage and onto the filtration surfaces, preventing direct chaotic injection that would cause backflow and negative pressure. This intermediary structure optimizes the cleaning effectiveness while eliminating harmful flow patterns.
3Area of stationary object
If multiple filter tubes are arranged to increase filtration capacity, then the filtration area increases, but the device volume becomes huge and production cost increases
Solution Approach 1:
By nesting a second cylinder within the first cylinder, the patent effectively doubles the filtration area (outer surface of first cylinder plus outer surface of second cylinder) without requiring two separate filter tubes. This nested configuration achieves the same filtration capacity as multiple tubes would provide, but with significantly reduced device volume and lower production costs, as only one assembled unit is needed instead of multiple separate tubes.
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 design increases filtration area by 1.5 to 2 times, improves dust removal efficiency, reduces production and maintenance costs, and prolongs the service life of the filter tubes by addressing backflow and negative pressure issues.
Implementation Method 1
the high-pressure and high-speed pulse-jet gas is ejected into the corresponding ejector through a nozzle in the pipeline; the pulse-jet gas enters the corresponding filter tube, and peels off the pressed powder layer on the outer surface of the filter tube using the transient energy
Implementation Method 2
The dusty gas enters the filter tube under the effect of a pressure difference from an outer surface of the filter tube through the pores in the filtration material. The solid particles in the gas are intercepted on the outer wall of the filter tube
Data Source
AI summary
A filter tube for high temperature gas-solid separation is provided that has a first cylinder and a second cylinder coaxially nested in the first cylinder with the first cylinder arranged so that an opening thereof faces upward, a first connection flange provided at a periphery of the opening of the first cylinder, and a circular through-hole provided at a bottom of the first cylinder. The second cylinder is nested in the first cylinder so that an opening of the second cylinder faces downward. The second cylinder has an end at an opening thereof that is hermetically connected to the circular through-hole of the first cylinder. The second cylinder has a bottom, and the bottom of the second cylinder and the opening of the first cylinder are at the same horizontal level. An annular gas passage is formed between the first cylinder and the second cylinder.