Filter Element Cleaning via Partial Adjacent Coverage
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Solution Overview
Problem
Existing filter devices for particle-carrying gases experience a high concentration of particles, particularly fine dust, in the clean gas stream after cleaning a filter element, leading to increased particle influx into the clean gas space due to higher differential pressure and flow rates.
Innovation Solution
The solution involves partially covering adjacent filter elements during the cleaning process to reduce the raw gas flow through freshly cleaned filter elements, and using a flushing gas at a pressure slightly higher than the raw gas space to gently loosen the particle layer without blowing it free, thereby reducing particle transmission into the clean gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter elements are cleaned by blowing free with rinsing gas, then the particle layer is detached from the filter element, but the particle concentration in the clean gas space increases significantly
Solution Approach 1:
The patent applies preliminary anti-action by covering adjacent filter elements with covers before cleaning begins. This preventive measure blocks the path of detached particles to neighboring filter elements, preventing them from being sucked into the clean gas space. The covers are positioned in advance to intercept particles before they can cause harm.
Solution Approach 2:
The patent converts the harmful effect of high-velocity rinsing gas that detaches particles into a beneficial cleaning action. By using sufficient gas velocity to detach the particle layer while simultaneously covering adjacent elements, the harmful particle dispersion is transformed into effective filter element regeneration, with particles being directed into collection trays rather than contaminating clean gas.
2Productivity
If the differential pressure across filter elements is increased to improve filtration, then the flow rate through filter elements increases, but more particles are transmitted to the clean gas space after cleaning
Solution Approach 1:
The patent applies preliminary anti-action by positioning covers over adjacent filter elements before the cleaning process begins. This preventive measure ensures that when high differential pressure is applied during cleaning to achieve effective particle detachment, the detached particles are blocked from entering the clean gas space through neighboring elements, thus allowing high flow rates without the harmful side effect of particle transmission.
3Reliability
If filter elements are cleaned frequently to maintain filtration efficiency, then the filter system requires more cleaning operations, but operational interruptions increase
Solution Approach 1:
The patent applies preliminary action by preparing the cleaning system in advance - positioning covers, connecting rinsing gas supplies, and arranging collection trays before cleaning operations begin. This pre-positioning allows cleaning to start immediately when needed, reducing the time required for cleaning operations and minimizing operational interruptions while maintaining filtration efficiency.
Solution Approach 2:
The patent enables continuous operation during cleaning by having multiple filter elements arranged in parallel, where some elements can be cleaned while others remain in service. The covers and collection trays are positioned to allow cleaning operations to proceed without shutting down the entire filtration system, maintaining continuous useful action of particle filtration.
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 approach reduces the particle concentration in the clean gas by gradually reintegrating filter elements with lower pressure loss, maintaining filter efficiency and eliminating the need for a blower, resulting in cost and maintenance advantages.
Implementation Method 1
rinsing gas, for example compressed air, in countercurrent to the direction of flow of the raw gas through the first filter element
Implementation Method 2
The detached dust cake falls down due to gravity and is usually caught in a trough and disposed of from there
Implementation Method 3
filter elements provided for filtering the raw gas flow... with the particles to be filtered being retained on the filter elements
Data Source
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AI summary
The invention relates to a device 1 for filtering particles from gases, comprising at least one raw gas chamber 3 for passing through a particle-laden raw gas stream 1, at least one clean gas chamber 6 for receiving a clean gas stream 1 resulting from filtering the raw gas stream 1, and a number of filter elements 12 provided for filtering the raw gas stream 1, each having a raw gas side 14 and a clean gas side 15, wherein the raw gas side 14 of the filter elements 12 is connected to the raw gas chamber 3 and the clean gas side 15 of the filter elements 12 is connected to the clean gas chamber 6, and wherein a pressure difference can be established between the raw gas chamber 3 and the clean gas chamber 6, so that the filter elements 12 are permeated by the raw gas stream 1 in a flow direction from the raw gas side 14 to the clean gas side 15 and thereby filter particles from the raw gas stream.and further comprising a rinsing device with at least one rinsing nozzle 16 for the on-demand and/or regular cleaning of at least one filter element 12 and at most a portion of the filter elements 12 simultaneously, for the purpose of which the rinsing nozzle 16 can be moved towards the clean gas side 15 of a first filter element 12.2, 12.4 to be cleaned in order to direct rinsing gas in a countercurrent M2 to the flow direction through the first filter element 12.2, 12.4 in a rinsing position, and wherein the rinsing device is designed such that in the rinsing position at least one second filter element 12.3, which is arranged next to the first filter element 12.2, 12.4 to be cleaned, is covered, so that the second filter element 12.3 cannot be passed through by the raw gas stream 1. The device is characterized in that the rinsing device in the rinsing position also covers at least one third,filter element 12.1, 12.5, arranged next to the first filter element 12.3 to be cleaned and/or next to the second filter element 12.3, only partially covers in order to reduce the flow through this third filter element 12.1, 12.5 with the raw gas stream 1.