Static Mixer in Stock Deaeration System
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Solution Overview
Problem
Existing stock deaeration systems in fiber web production lines face inefficiencies in mixing stock components, leading to inconsistent quality and increased energy consumption, particularly in the removal of air and gases before the deaeration process.
Innovation Solution
Incorporating a static mixer or fluidizator between the feed pipe and the deaeration tank, with additional flow components such as wire water or chemical flows added before the mixer to enhance mixing and deaeration efficiency, and feeding dilution water just before the deaeration tank to minimize energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a static mixer or fluidizator is added between the feed pipe and deaeration tank, then mixing quality and deaeration efficiency are improved, but device complexity increases
Solution Approach 1:
A static mixer or fluidizator is introduced as an intermediary device between the feed pipe and deaeration tank. This intermediary component enhances mixing quality by actively combining stock components before they enter the deaeration tank, thereby improving overall deaeration efficiency without requiring fundamental changes to the existing system architecture.
Solution Approach 2:
The static mixer or fluidizator performs preliminary mixing action on the stock components before they enter the deaeration tank. By pre-mixing the stock in the feed pipe, the system ensures more uniform distribution of fibers and additives, which facilitates more effective deaeration in the subsequent tank while maintaining stable process conditions.
2Use of energy by moving object
If dilution water is added just before the deaeration tank, then energy consumption is reduced, but mixing consistency may worsen
Solution Approach 1:
Dilution water is added at an optimized location just before the deaeration tank rather than earlier in the process. This preliminary positioning of the dilution water addition point minimizes the distance the diluted stock must be pumped, thereby reducing energy consumption. The static mixer ensures that this late addition of water still achieves sufficient mixing consistency through its enhanced mixing action.
Solution Approach 2:
The system optimizes the timing and location of dilution water addition as a process parameter change. By adjusting when dilution water is introduced (just before the deaeration tank), the system achieves energy savings while the static mixer compensates for any potential mixing consistency issues through its improved mixing capability.
3Device complexity
If stock components are mixed in a pipe leading to the mixing tank, then equipment simplicity is maintained, but mixing efficiency and quality are insufficient
Solution Approach 1:
The system replaces or supplements traditional mechanical mixing in a large mixing tank with a static mixer or fluidizator installed in the feed pipe. This substitution maintains equipment simplicity by avoiding additional large mixing vessels while achieving superior mixing efficiency through the static mixing elements that create intense local mixing zones as stock flows through the pipe.
Solution Approach 2:
Mixing action is moved to the feed pipe leading to the mixing tank, performing preliminary mixing before the stock enters the main mixing tank. This preliminary mixing in the feed pipe reduces the mixing burden on the main tank and improves overall mixing efficiency and quality while maintaining the simplicity of the existing tank system.
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 improved mixing system ensures consistent and high-quality stock for fiber web production, stabilizes process conditions, and reduces energy consumption by optimizing the deaeration process and minimizing consistency variations.
Implementation Method 1
a static mixer or a fluidizator located between the feed pipe and the inlet of the deaeration tank
Implementation Method 2
In active deaeration is used a vacuum deaeration tank where dissolved gas and gas bubbles are boiled off
Implementation Method 3
where dissolved gas and gas bubbles are boiled off
Implementation Method 4
To intensify the deaeration process, stock or wire water can be sprayed through jet nozzles onto the roof of the tank thereby enlarging the gas removal surface area
Data Source
Figure 1
AI summary
The invention relates to a stock deaeration system (10) comprising a deaeration tank (11) with an inlet (12) and a feed pipe (13) for feeding stock flow into the deaeration tank (11) for removal of air and other gases from the stock. The stock deaeration system (10) further comprises a static mixer (20) or a fluidizator (20) located between the feed pipe (13) and the inlet (12) of the deaeration tank (11).