Flash Tank Flared Inlet Insert for Black Liquor Turbulence Reduction
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Solution Overview
Problem
Conventional flash tanks experience disruption and turbulence when black liquor enters through abrupt transitions, leading to inefficient flashing and energy loss in pulping systems.
Innovation Solution
The introduction of an insert inlet tube assembly with a cylindrical section and a flared section that is gradually offset towards the sidewall, maintaining a substantially uniform cross-sectional area and using wear-resistant materials to minimize turbulence and ensure structural integrity, allowing for smoother flow and reduced pressure release disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If black liquor enters through an abrupt transition from inlet pipe to flash tank, then the结构简单 (structure is simple), but turbulence and disruption occur leading to energy loss
Solution Approach 1:
An insert inlet tube is introduced as an intermediary component between the inlet pipe and flash tank chamber. This tube features a gradual flare section that mediates the transition, allowing smooth flow adaptation and eliminating abrupt transitions that cause turbulence. The insert tube acts as a buffer zone that transforms the incoming flow pattern without requiring complete redesign of either the inlet pipe or tank structure.
Solution Approach 2:
The insert inlet tube incorporates a curved, flared geometry instead of sharp angles or abrupt transitions. The gradual flare section uses continuous curvature to guide the flow smoothly from the inlet pipe into the flash tank chamber, reducing flow separation and turbulence. This curved transition path maintains kinetic energy and minimizes disruptive eddies.
2Stability of the object's composition
If the insert inlet tube flared section is gradually offset towards sidewall, then flow smoothness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The flare section geometry is defined by specific parameters including flare angle, offset distance from centerline, and section length. By optimizing these parameters, the design achieves smooth flow transition while maintaining manufacturability. The gradual offset creates a controlled flow direction change that stabilizes the liquid stream without requiring ultra-precise manufacturing tolerances.
3Reliability
If wear-resistant materials are used for insert inlet tube, then structural integrity and durability are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The insert inlet tube is constructed from composite or coated materials that combine structural integrity with wear resistance. This may involve using stainless steel base material with protective coatings, or composite materials that provide both mechanical strength and resistance to chemical degradation from black liquor. The composite approach achieves enhanced durability without requiring entirely new material systems.
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 design minimizes turbulence and ensures a smooth, direct flow of black liquor into the flash tank, enhancing the flashing process by maintaining constant velocity and reducing energy loss, thereby improving the efficiency of steam generation and chemical recovery.
Implementation Method 1
The insert inlet tube may include a cylindrical section having a circular cross-section centered on the longitudinal axis, and a flared section between the circular section and the insert outlet, wherein the flared section is gradually offset from the longitudinal axis of the cylindrical section toward a sidewall of the flash tank proximate to the insert outlet
Implementation Method 2
Flash tanks are generally used to flash a high pressure fluid liquor stream including steam and condensate
Data Source
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AI summary
A flash tank (10) includes: an interior chamber having a interior surface formed by a sidewall of the flash tank (10); a vapor exhaust port coupled to an upper portion of the chamber; a liquid discharge port coupled to a lower portion of the chamber; an insert inlet tube (34) having an insert outlet (36) and inserted into an inlet port (18) of the chamber, wherein the insert inlet tube (34) extends inward of the sidewall and the insert outlet (36) has an elongated cross-sectional shape oriented substantially parallel to a center vertical axis (24) of the flash tank (10) and substantially perpendicular to a radial line of the flash tank (10), such that the insert outlet (36) is substantially tangential to the sidewall.