Static Mixer Regulation Valve Pressure Control
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Solution Overview
Problem
Static mixers face challenges in efficiently mixing chemicals into fiber suspensions due to clogging, pressure fluctuations, and inconsistent mixing results, especially when pulp consistency varies, leading to inefficient energy use and potential clogging issues.
Innovation Solution
A system with a regulation valve and a closing valve is used to control the flow of pulp and chemical, incorporating an auxiliary medium to maintain a constant pressure difference and flow, ensuring stable mixing conditions by combining pumping energy with the regulation valve to create uniform flow conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If static mixers are used to mix chemicals into fiber suspensions, then energy consumption is reduced compared to dynamic mixers, but mixing efficiency deteriorates due to clogging and pressure fluctuations
Solution Approach 1:
The patent applies dynamics by introducing a dynamic regulation valve downstream of the static mixer to actively control and stabilize the pressure difference across the mixer. This dynamic control compensates for pressure fluctuations caused by varying pulp consistency and flow rates, maintaining reliable mixing efficiency while preserving the energy benefits of static mixing.
Solution Approach 2:
The regulation valve operates based on feedback from pressure sensors that monitor the pressure difference across the static mixer. When pressure fluctuations are detected, the valve automatically adjusts to maintain the optimal pressure difference, ensuring consistent mixing performance despite changes in pulp properties or flow conditions.
2Adaptability or versatility
If pulp consistency varies, then production flexibility is improved, but mixing stability deteriorates due to pressure fluctuations
Solution Approach 1:
The system uses pressure sensors and a regulation valve to create a feedback control loop that automatically compensates for pressure fluctuations caused by varying pulp consistency. This allows the system to maintain stable mixing conditions across a wide range of production rates and pulp properties without requiring manual intervention.
Solution Approach 2:
The regulation valve dynamically adjusts the downstream pressure to compensate for changes in pulp consistency and flow rate. By actively modifying the pressure parameter, the system maintains a constant pressure difference across the static mixer, ensuring stable mixing performance despite variations in production conditions.
3Productivity
If flow rate is increased to improve productivity, then production output is improved, but mixing uniformity deteriorates due to turbulent flow variations
Solution Approach 1:
The pressure feedback control system continuously monitors and adjusts the pressure difference across the static mixer to maintain optimal mixing conditions even at high flow rates. This ensures that mixing uniformity is preserved despite the increased turbulence and flow variations associated with high productivity operation.
Solution Approach 2:
The dynamic regulation valve adapts to changing flow conditions by actively controlling the downstream pressure. This dynamic adjustment compensates for turbulence and flow variations, maintaining consistent mixing quality across the full range of production rates from low to high output.
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 stabilizes chemical mixing, reduces energy consumption, and prevents clogging, allowing efficient mixing across a wide range of pulp production levels by maintaining consistent pressure and flow, even in fluctuating conditions.
Implementation Method 1
a pump (102), a closing valve (110), a static mixer apparatus (106) whereto a chemical feed line (104) is connected, and a regulation valve (108)... stabilizes chemical mixing... by maintaining consistent pressure and flow
Implementation Method 2
a regulation valve (108)... for regulating the pumping of medium consistency pulp... combining pumping energy with the regulation valve to create uniform flow conditions
Implementation Method 3
In a static mixer, by throttling the flow, i.e. decreasing the cross-sectional area, an increase in the flow rate is achieved, and due to the throttling and the shape of the flow channel a strong motion mixing the suspension, even turbulence is generated
Implementation Method 4
a pump (102)... combining pumping energy with the regulation valve to create uniform flow conditions
Data Source
Figure 1
Figure 2a~2b
Figure 3~4
AI summary
The present invention relates to an arrangement and a method for feeding chemical into a fiber suspension in a fiber suspension transfer line. The arrangement comprises in the flow direction of the suspension a pump (102), a closing valve (110), a static mixing apparatus (106) whereto a chemical feed line (104) is connected, and a regulation valve (108). A conduit (120) is connected to the chemical feed line for adding a medium into the chemical flow if needed for maintaining an adequate flow into the mixer (106).