Horizontal Plate Filter Helix Flow Ventilation
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Solution Overview
Problem
The duration of the drying and ventilation phases in horizontal plate filters is prolonged due to inefficient air displacement and turbulence during the filling process, which affects the formation of the filter cake and reduces the overall filter performance.
Innovation Solution
A flow control system is introduced in the ventilation duct, creating a helix-shaped flow that separates air from liquid, allowing for immediate discharge of air through a dedicated outlet, reducing the need for a liquid/gas mixture to be displaced, and enhancing degassing by creating a negative pressure zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the ventilation duct is provided with a flow control system to create helix-shaped flow and separate air from liquid, then the ventilation phase duration is significantly shortened, but the device complexity increases
Solution Approach 1:
The ventilation duct is segmented into multiple sections with flow control devices positioned at different locations. These devices divide the flow path into distinct zones (inlet section, transition section, outlet section) that handle different flow characteristics separately, enabling efficient air-liquid separation while managing complexity through modular segmentation.
Solution Approach 2:
Flow control devices act as intermediary elements between the connecting ducts and the ventilation duct. These intermediaries (flow control devices) modify the flow characteristics by creating helix-shaped flow patterns, enabling smooth transition from connecting ducts to the ventilation duct while facilitating air-liquid separation without direct connection.
2Ease of manufacture
If compressed air is applied via aeration and ventilation ducts to blow dry the filter cake, then the drying process can be performed, but the drying phase duration becomes significant and reduces filter readiness time
Solution Approach 1:
The flow control system is designed to create helix-shaped flow patterns that promote air-liquid separation before the actual drying process begins. By pre-establishing this flow pattern in the ventilation duct, the system prepares the flow path to efficiently separate air from liquid during the drying phase, reducing the overall drying time.
Solution Approach 2:
The system utilizes pneumatic principles by applying compressed air through the aeration and ventilation ducts to blow dry the filter cake. The flow control devices optimize this pneumatic action by creating helix-shaped flow that enhances air penetration and contact with the filter cake, improving drying efficiency and reducing the time required.
3Ease of operation
If dirty liquid and air are displaced through connecting channels into the aeration and ventilation channel, then venting can occur, but the available channel cross-section is filled with displaced dirty liquid preventing quick air escape
Solution Approach 1:
The flow control devices create helix-shaped (curved) flow paths instead of straight flow channels. This curvature causes the flow to follow a spiral path along the duct wall, which prevents direct filling of the channel cross-section with liquid and allows air to escape more quickly through the curved flow pattern that promotes separation.
Solution Approach 2:
The flow control devices transform the flow from a two-dimensional channel filling to a three-dimensional helix-shaped flow pattern. By introducing this dimensional change (curved path along the duct wall), the system creates a free lumen in the central region where air can escape independently of the liquid flow, adding a third dimension to the flow management.
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 significantly shortens the ventilation phase, allowing for quicker transition to the operating phase, thereby increasing filter performance and reducing downtime.
Implementation Method 1
A flow control system is introduced in the ventilation duct, creating a helix-shaped flow that separates air from liquid
Implementation Method 2
enhancing degassing by creating a negative pressure zone
Implementation Method 3
due to the increasing filling of the filter plate stack from below - a compression of the air that increases steadily upwards with the result that during the filling process in the filter chambers increasing Form turbulences
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The horizontal plate filter has filter plates (12) arranged in a detachably connected manner on each other to filter plates stack in a rack, attachment pieces arranged on opposite lying sides and through holes which form input channel (21) on inflow side and output channel (22) on outlet side. A flow control system is provided which comprises multiple flow control devices attached to connection channels for forming a hollow cylindrical flow body radially defined by a channel wall. The flow control devices are designed in such a way that the ventilations are deflected in a wall flow.