Polysilicon Rod Removal with Protective Cover
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Solution Overview
Problem
Existing methods for removing polycrystalline silicon rods from reactors are inefficient, leading to high risks of breakage, contamination, and prolonged batch changeover times due to the need for extensive reactor disassembly and exposure of rods to the environment, which can result in safety hazards and economic losses.
Innovation Solution
A method involving a protective cover or elements that encase the rods during removal, allowing for safe extraction without exposing them to the environment, combined with immediate reactor cleaning and a foldable protective wall for efficient handling and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the reactor top is removed and rods are removed individually, then access to rods is improved, but the risk of rod breakage and contamination increases
Solution Approach 1:
The removal device is divided into multiple independent clamping units (first clamping unit, second clamping unit, etc.) that can independently grasp different rods. Each clamping unit includes its own clamping mechanism, allowing simultaneous secure handling of multiple rods without interfering with each other, thus preventing breakage while maintaining easy access.
Solution Approach 2:
A protective cover is introduced as an intermediary element between the rods and the external environment. The cover can be positioned over the rods before removal, protecting them from contamination and breakage risks during the removal process, while still allowing the clamping units to access and grasp the rods through or alongside the cover structure.
2Ease of operation
If extensive reactor disassembly is performed, then rod removal access is improved, but batch changeover time increases
Solution Approach 1:
The essential function of the reactor top (providing access for rod removal) is extracted and transferred to a movable removal device. This device can be positioned at the reactor and perform removal operations without requiring complete disassembly of the reactor top structure, significantly reducing the time needed for batch changeover while maintaining full access to the rods.
Solution Approach 2:
The removal device incorporates movable and adjustable components including extendable arms, movable clamping units, and an adjustable protective cover. These dynamic elements allow the device to adapt to different reactor configurations and rod positions, enabling efficient rod removal through various access points without requiring extensive static disassembly of the reactor.
3Ease of operation
If rods are exposed to the environment during removal, then removal operation is simplified, but contamination risk increases
Solution Approach 1:
A protective cover serves as an intermediary barrier between the rods and the external environment. The cover can be positioned to enclose or shield the rods during the removal process, allowing the clamping units to manipulate and remove the rods while maintaining protection from contamination. The cover acts as a controlled interface that simplifies the removal operation while preventing harmful environmental factors from contacting the rods.
4Productivity
If multiple rods are removed simultaneously, then productivity is improved, but the complexity of the removal device increases
Solution Approach 1:
The removal device is segmented into multiple identical or similar clamping units distributed along its structure. Each clamping unit is a relatively simple, standardized module that can independently grasp one rod. By repeating this simple module multiple times, the device achieves the capability to remove multiple rods simultaneously while keeping each individual component simple and manageable, thus balancing productivity improvement with device complexity.
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 approach significantly reduces batch changeover times, minimizes rod breakage and contamination, and enhances safety by ensuring rods are never freely exposed, enabling faster and more efficient reactor setup and cleaning.
Implementation Method 1
a support body or a support structure comprising two rods and a bridge connecting the rods is heated by direct current passage
Implementation Method 2
a reaction gas containing one or more silicon-containing components and, optionally, hydrogen, is introduced into a reactor comprising support bodies heated by direct current flow, whereby silicon is deposited on the support bodies in solid form
Data Source
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AI summary
The invention relates to a process for producing polycrystalline silicon, comprising introducing a reaction gas comprising a silicon-containing component and hydrogen into a reactor comprising a base plate, an upper reactor section secured to the base plate and at least one support body heated by direct passage of current, on which polycrystalline silicon is deposited, such that at least one polycrystalline silicon rod is obtained, wherein, after the deposition has ended, a protective shell or a protective wall is placed laterally around the reactor during the deinstallation of the at least one polycrystalline silicon rod.