Pulp Discharge Apparatus with Segmented Conduits
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Solution Overview
Problem
Existing methods for discharging high consistency pulp from vessels are inefficient, leading to pulp stagnation and agglomerate formation, and lack flexibility in adjusting discharge consistency, as seen in prior art such as centrifugal pumps and separate discharge lines.
Innovation Solution
An apparatus with a first section for diluting pulp to a lower consistency, featuring a first discharge conduit and a second discharge conduit connected upstream, allowing for flexible control of pulp consistency by mixing flows with a pump, and a method that introduces pulp into a vessel at different consistencies, dilutes it, and discharges through strategically positioned outlets to achieve a consistent third consistency between the initial two.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high consistency pulp is discharged directly from the vessel, then the discharge consistency is high, but pulp stagnation and agglomerate formation occur
Solution Approach 1:
The discharge system is segmented into multiple discharge conduits (first discharge conduit from first section, second discharge conduit from second section) with different outlet positions. This segmentation allows selective discharge from different vessel sections to prevent stagnation while maintaining high consistency discharge.
Solution Approach 2:
The system dynamically adjusts discharge consistency by controlling the ratio of pulp flow from the first section versus the second section. The mixing means and connected discharge conduits enable real-time adjustment of discharge parameters to optimize both consistency and flow stability.
2Adaptability or versatility
If separate discharge lines are used for different pulp zones, then discharge flexibility is improved, but device complexity increases
Solution Approach 1:
The first discharge conduit and second discharge conduit are connected upstream of their outlets, merging their flows before discharge. This combining approach simplifies the overall system architecture while maintaining the ability to independently control discharge from different vessel sections, reducing complexity compared to fully separate discharge lines.
Solution Approach 2:
The mixing means acts as an intermediary between the first and second discharge conduits, combining pulp flows from different consistency zones. This intermediary component enables flexible consistency adjustment without requiring complex independent control systems for each discharge line.
3Productivity
If centrifugal pump is used for high consistency pulp discharge, then discharge capability is achieved, but pulp must be diluted to low consistency
Solution Approach 1:
The vessel is divided into a first section and second section with different pulp consistency characteristics. The first discharge conduit draws from the first section while the second discharge conduit draws from the second section, allowing local discharge of high consistency pulp from the second section without requiring overall dilution of the entire pulp mass.
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
Facilitates efficient and flexible control of pulp consistency during discharge, preventing stagnation and agglomerate formation by ensuring symmetric flow and homogenization, allowing discharge consistency to be adjusted between 6-15%, enhancing the operational efficiency of pulp vessels.
Implementation Method 1
the first section is provided with means for diluting the consistency of the pulp in the first section to have a second consistency lower than the first consistency
Implementation Method 2
a pump, said pump being arranged to pump a pulp flow from the first section to the second discharge conduit upstream the second outlet
Data Source
Figure 1~2
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AI summary
Invention relates to an apparatus for discharging pulp from a vessel (10) comprising a first section (14) for pulp at a second consistency and a second section (12) for pulp at a first consistency, in which vessel the pulp is arranged to flow from the second section (12) to the first section (14), the first section is provided with means for diluting (22, 24) the consistency of the pulp in the first section tohave a second consistency lower than the first consistency, the apparatus further comprising means for discharging pulp having a first discharge conduit (26) arranged to discharge pulp from the first section (14) of the vessel and being provided with a first outlet (32), and a second discharge conduit (34) arranged to discharge pulp from the second section (12) of the vessel (10) and being provided with a second outlet (40). The first outlet (32) is in flow connection with the second discharge conduit (34) up-stream the second outlet (40), so that pulp flowing at the second outlet has a third consistency between the first and the second consistency. The invention also relates to method of discharging pulp from a vessel and to method of upgrading an existing pulp vessel.