Filter Plate Orifice Plate Air Drying Erosion Control
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Solution Overview
Problem
Current filter plate packs face issues with unequal chamber conditions during air drying of filter cakes, leading to uneven cake distribution and high air flow risks that can cause filter plate erosion and damage.
Innovation Solution
The implementation of a flow regulating device, such as an orifice plate or throttle valve, to throttle air flow into each filter chamber, ensuring choked flow conditions and equalizing air flow across all chambers, thereby preventing excessive air flow and erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If compressed air is forced through the filter cake at high pressure to achieve low residual moisture content, then drying efficiency is improved, but the risk of filter plate erosion and damage increases due to high air flow
Solution Approach 1:
The patent introduces a flow regulating device that changes the flow parameters of drying air by creating a throttling effect. This allows the system to maintain high drying efficiency while controlling the air flow velocity to prevent filter plate erosion. The flow resistance introduced by the regulating device modifies the pressure and velocity characteristics of the air stream.
Solution Approach 2:
The flow regulating device acts as an intermediary element between the compressed air source and the filter cake. It mediates the air flow by introducing a controlled flow resistance, which equalizes the air distribution across different chambers and prevents excessive velocity that would cause erosion, while still allowing sufficient air flow for effective drying.
2Productivity
If air flow is increased to improve drying performance in individual chambers, then moisture removal is enhanced, but unequal chamber conditions lead to some chambers taking very high air flows causing erosion risks
Solution Approach 1:
The flow regulating device is installed in each individual filter plate, allowing local control of air flow to each chamber. This enables equalization of air distribution across all chambers regardless of their individual conditions, ensuring that no single chamber receives excessively high air flow that would cause erosion, while maintaining effective drying in all chambers.
3Device complexity
If no flow regulation is used to simplify the system, then device complexity is reduced, but exceptional conditions in filter chambers cause uncontrolled air flow and potential damages
Solution Approach 1:
The flow regulation function is segmented and distributed to individual filter plates rather than using a centralized complex control system. Each filter plate incorporates its own flow regulating device, which is a simple mechanical component (such as an orifice plate or throttle valve). This segmentation approach provides effective flow control and protection against erosion while maintaining relative system simplicity through the use of straightforward, decentralized components.
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
This solution ensures consistent air flow and reduced risk of erosion by maintaining choked flow conditions, even in chambers with reduced flow resistance, thereby enhancing the reliability and safety of the filter cake air drying process.
Implementation Method 1
The orifice of the orifice plate is so sized that, in case the flow resistance of the filter chamber falls below a normal level, choked flow is achieved in the orifice.
Implementation Method 2
The drying air is under pressure when it is fed into the filter chamber, where it pushes residual liquid through the filter cake.
Data Source
AI summary
A method for air drying a filter cake contained in a filter chamber defined by a first filter plate, which comprises an air inlet for supplying drying air into the filter chamber to expel fluids from the filter cake, and a second filter plate, which comprises a fluid outlet for discharging fluids from the filter chamber. The method comprises throttling the air flow into the filter chamber by means of an orifice plate that acts as a flow resistance connected in series with the flow resistance of the filter chamber. Preferably the orifice of the orifice plate is so sized that, in case the flow resistance of the filter chamber falls below a normal level, choked flow is achieved in the orifice.