Membrane Filtration Cleaning With a Uniform Blow Header Gas Layer
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Solution Overview
Problem
In membrane filtration systems with multiple modules connected in parallel, the uniformity of cleaning effect is compromised due to variations in gas flow resistance caused by raw water in the blow header pipe, leading to uneven cleaning efficiency among modules.
Innovation Solution
Forming a gas layer across the entire longitudinal direction of the blow header pipe before introducing gas into the modules, ensuring uniform gas distribution and consistent cleaning efficacy across all modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gas is introduced into multiple modules through a common blow header pipe containing raw water, then gas can be supplied to all modules, but gas flow resistance varies among modules leading to ununiform cleaning effect
Solution Approach 1:
The patent applies preliminary action by forming a gas layer in the blow header pipe before introducing gas into the modules. This pre-formed gas layer serves as a cushion that equalizes gas flow distribution across all modules, preventing the variation in gas flow resistance that would otherwise occur due to raw water presence. The gas layer is created by introducing gas through a gas introduction port before the main cleaning operation begins.
Solution Approach 2:
The gas layer acts as an intermediary substance between the gas source and the modules. Instead of gas directly contacting raw water in the blow header pipe (which causes uneven flow resistance), the gas layer mediates the gas flow, providing a uniform interface that ensures consistent gas distribution to all modules while eliminating the harmful effect of raw water interference.
2Adaptability or versatility
If raw water remains in the blow header pipe during gas introduction, then the pipe can be used for both liquid and gas flow, but gas flow resistance becomes ununiform among parallel modules
Solution Approach 1:
The patent uses preliminary action by pre-forming a gas layer in the blow header pipe before gas introduction. This gas layer replaces the raw water in the gas flow path, ensuring uniform gas flow distribution while preserving the pipe's multi-functional capability. The gas layer is established in advance through a gas introduction port, creating a consistent interface for subsequent gas flow operations.
Solution Approach 2:
The gas layer serves as an intermediary that allows the blow header pipe to handle both liquid (raw water) and gas flows effectively. During gas introduction, the gas layer mediates the interaction between gas and pipe, preventing direct gas-raw water contact that would cause flow resistance variations. This intermediary layer enables the pipe to maintain versatility while achieving precise gas flow uniformity.
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 method ensures a uniformly distributed gas flow, thereby achieving consistent cleaning effects among all modules, enhancing the overall efficiency and uniformity of the cleaning process.
Implementation Method 1
forming a gas layer across the entire longitudinal direction of the blow header pipe
Data Source
AI summary
A cleaning method of a membrane filtration system in which a plurality of modules including an inlet side region and an outlet side region separated by a filtration membrane are connected in parallel by a common blow header pipe in the inlet side region, the method including backwashing and blowing in which after the backwashing is started, gas is introduced into the plurality of modules through a blow header pipe. The method further includes forming, before the blowing is started, a gas layer across an entire longitudinal direction of the blow header pipe.