Degassing Valve Dynamics for Pump Stability
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Solution Overview
Problem
Booster MC pumps in pulp and paper production face instability and fiber leakage due to fluctuating gas content, leading to inefficient pumping and process fluctuations, as existing degassing systems struggle to react to quick changes in pressure and gas volume.
Innovation Solution
A pressurized degassing vessel system is introduced, working under overpressure to stabilize the degassing process by maintaining a controlled pressure difference and damping quick changes, reducing the risk of fiber leakage through the degassing valve, and utilizing a self-priming pump to manage blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional degassing system is used in booster MC pumps, then gas removal is achieved, but the system cannot react quickly to fluctuations in gas content and pressure, causing instability and fiber leakage
Solution Approach 1:
The degassing valve is designed to move between fixed positions (closed, partially open, fully open) based on real-time pressure differential signals. This dynamic positioning allows the system to adapt quickly to changing gas content and pressure conditions, resolving the contradiction between stability and response speed.
Solution Approach 2:
A control system continuously monitors the pressure differential between the pump inlet and degassing line, and automatically adjusts the degassing valve position accordingly. This feedback mechanism enables rapid response to gas content fluctuations while maintaining stable pump operation, addressing both reliability and speed requirements.
2Productivity
If the degassing valve opens quickly to remove accumulated gas, then gas removal efficiency improves, but fiber leakage increases
Solution Approach 1:
The degassing valve transitions through defined positions (closed, partially open, fully open) rather than abrupt full opening. This dynamic, staged approach allows gas to be removed efficiently while controlling the flow rate to prevent fiber leakage, resolving the contradiction between productivity and harmful effects.
Solution Approach 2:
The system prepares for potential fiber leakage by using a controlled, staged valve opening process rather than immediate full opening. This cushioning approach anticipates the harmful effect and mitigates it through gradual adjustment, allowing efficient gas removal while protecting against fiber loss.
3Reliability
If pressure differential is increased to improve gas separation, then degassing effectiveness improves, but the risk of fiber leakage through the degassing valve increases
Solution Approach 1:
The degassing valve dynamically adjusts its opening degree based on the actual pressure differential and gas content conditions. This allows the system to maintain effective gas separation by keeping the valve appropriately open while preventing fiber leakage by closing or partially closing when pressure differential becomes too high.
Solution Approach 2:
The control system monitors and responds to changes in pressure differential parameters, adjusting the valve position to maintain optimal conditions. By changing the valve opening parameter in response to pressure differential changes, the system achieves effective degassing while preventing fiber entrainment.
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 system ensures stable operation of booster MC pumps by maintaining a consistent pressure difference and reducing fiber entrainment, thereby improving pumping efficiency and process stability even under varying conditions.
Implementation Method 1
maintaining a controlled pressure difference and damping quick changes
Implementation Method 2
damping quick changes
Implementation Method 3
utilizing a self-priming pump to manage blockages
Implementation Method 4
the centrifugal force applied to the MC pulp promotes the separation between the trapped gases and the water/pulp suspension
Data Source
AI summary
A method for controlling a gas flow separated from a suspension of medium consistency pulp. The pulp is treated in a pulp treatment apparatus including a first pump and a second pump, wherein the second pump is a degassing centrifugal pump provided with a degassing system which includes a degassing conduit in which a degassing valve is arranged for regulating a pressure difference between an inlet of the second pump and the degassing conduit. The degassing system also includes a pressurized degassing vessel working under overpressure and having an inlet and an outlet, wherein the outlet of the vessel is connected to a pressure control valve for maintaining a desired overpressure in the vessel.