Reduced-Diameter Treatment Vessel Outlet With Conical Flow Core
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Solution Overview
Problem
Treatment vessels with large outlet ends face challenges such as slow mass flow and blockages, leading to reduced treatment capacity and efficiency, and increased build height when access is required.
Innovation Solution
A treatment vessel design featuring a conical or frustoconical outlet section with a conical body positioned to maintain flow without increasing height, using a conical body with its base within a perpendicular distance of ¼ of the main section's diameter, aligned with the treatment vessel's axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the outlet end diameter is reduced to improve access and reduce build height, then ease of operation is improved, but mass flow efficiency deteriorates causing slow discharge and blockages
Solution Approach 1:
The outlet section is designed with a conical or frustoconical shape instead of a cylindrical form, creating a tapered geometry that smoothly transitions from the main vessel diameter to the reduced outlet diameter. This curved, tapered surface guides material flow efficiently while maintaining structural integrity and preventing blockages despite the reduced outlet size.
Solution Approach 2:
The conical body positioned within the outlet section creates a three-dimensional flow path that utilizes vertical space efficiently. By positioning the conical body's base within a perpendicular distance of 1/4 or less of the main section diameter from the transition plane, the design optimizes the spatial arrangement to maintain flow velocity and prevent material accumulation in the reduced-diameter region.
2Length of stationary object
If the outlet end diameter is reduced to reduce build height, then the vessel height is reduced, but mass flow efficiency deteriorates causing slow discharge
Solution Approach 1:
The conical or frustoconical outlet section provides a smooth, curved transition that maintains material flow velocity through the reduced-diameter region. The tapered geometry prevents abrupt changes in flow direction and pressure, ensuring efficient discharge despite the compact vertical footprint achieved by reducing the outlet end diameter.
Solution Approach 2:
The outlet section parameters (diameter, taper angle, conical body positioning) are optimized to maintain critical flow characteristics. By positioning the conical body base within 1/4 of the main section diameter from the transition plane, the design ensures sufficient flow area and velocity are maintained throughout the outlet section, preserving discharge rate while minimizing vessel height.
3Strength
If a dome-shaped outlet end is used to withstand pressure, then strength is improved, but access to the outlet opening is hindered and build height increases
Solution Approach 1:
The conical or frustoconical outlet section maintains the curved, domed geometry needed to withstand internal pressure while providing a tapered transition to the outlet opening. This curved structure distributes stress effectively throughout the outlet end, maintaining pressure resistance comparable to traditional dome designs while enabling better access.
Solution Approach 2:
The outlet end design uses asymmetric geometry where the upper portion maintains the curved, pressure-resistant dome shape, while the lower outlet section tapers to a smaller diameter. This asymmetric form allows the structure to withstand pressure from the main vessel while providing improved access to the outlet opening at the tapered end, reducing build height requirements.
Data Source
Figure 1~2C
AI summary
A treatment vessel (10) for treating lignocellulosic material comprises a main section (20) having a first end (24) and a second end (26), and an outlet section (40) that is conical or frustoconical and tapers from a first end (44) joined to the second end (26) of the main section (20) towards a second end (46) having an outlet opening (48). A conical body (60) is arranged within the treatment vessel (10), the vertex (64) of the conical body pointing away from the main section (20). The conical body (60) is positioned such that the base (62) thereof is positioned within a perpendicular distance (d) from a transition plane (T) defined by the junction between the first end (44) of the outlet section (40) and the second end (26) of the main section (20), wherein the perpendicular distance (d) is ¼ or less of the diameter (D) of the main section (20). A half angle (β) of the conical body (60) is 0.5-20° less, preferably 5-15° less, such as 10° less, than a half angle (α) of the outlet section (40).