Thermally Decoupled Drive Shaft for High-Temperature Oiling
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Solution Overview
Problem
Current systems for catalytic pressureless oiling of hydrocarbon-containing materials face challenges in efficiently raising temperatures to 400°C while protecting system components from heat generation, particularly affecting seals and bearings, which reduces operational reliability and efficiency.
Innovation Solution
A comminuting and mixing device is designed with a thermally decoupled comminution and mixing section using thin-walled stainless steel elements with low thermal conductivity, combined with a flexible coupling and a double-walled cover flange to minimize heat transfer, along with a shaft bearing/shaft seal unit featuring heat-resistant packing rings and a non-contact labyrinth seal, and an impeller pump with adjustable impeller blades for efficient grinding and mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the temperature is raised to 400°C or higher to improve process efficiency, then the catalytic pressureless oiling efficiency is improved, but the seal and bearing materials are damaged due to heat generation
Solution Approach 1:
The drive shaft is segmented into multiple sections separated by heat barriers made of thin-walled stainless steel elements with low thermal conductivity. This segmentation allows the drive shaft to transmit mechanical power while blocking heat transfer from the high-temperature mixing reactor to the bearing, enabling operation at 400°C without damaging the bearing materials
Solution Approach 2:
Heat barriers made of thin-walled stainless steel elements with low thermal conductivity are introduced as intermediary components between the high-temperature mixing reactor and the bearing. These heat barriers act as thermal mediators that allow mechanical power transmission while blocking heat transfer, protecting the bearing from thermal damage
2Strength
If the drive shaft is made solid with two ball bearings to support the main load, then the structural strength is improved, but the bearing overheats due to heat transfer from the mixing reactor
Solution Approach 1:
The drive shaft is divided into multiple sections by heat barriers made of thin-walled stainless steel elements. This segmentation maintains the structural integrity needed to support ball bearings while interrupting the heat transfer path from the high-temperature mixing reactor to the bearing, preventing overheating
Solution Approach 2:
The drive shaft is constructed as a composite structure combining solid sections for mechanical strength with thin-walled stainless steel heat barrier sections for thermal isolation. This composite design allows the bearing to be supported structurally while protected thermally from the high-temperature environment
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 allows for efficient temperature increase to 400°C while protecting system parts, enhancing operational reliability and efficiency by preventing overheating and ensuring effective mixing and comminution of materials.
Implementation Method 1
the comminution and mixing section is thermally decoupled from the drive device by means of a heat barrier made of thin-walled stainless steel elements with a low thermal conductivity coefficient
Implementation Method 2
The compression and mechanical heating of a medium by means of an impeller pump mounted eccentrically in a housing is known from DE102012000980A1
Data Source
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AI summary
A comminution and mixing device is equipped with a comminution and mixing section (P) designed for installation in the mixing reactor of the system, a drive unit (M) designed for positioning outside the mixing reactor, and a drive shaft (1) connecting this drive unit to the comminution and mixing section. The comminution and mixing section (P) is thermally decoupled from the drive unit (M). The device is used in systems for the catalytic, pressureless oleolysis of hydrocarbon-containing input material.