Ceramic Particle Loading via Counter-Current Air Flow
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Solution Overview
Problem
Loading ceramic particulate material into large vertical reactors poses challenges such as breakage, slow loading processes, and safety concerns due to high impact velocities when particles are poured from the top, leading to increased pressure drop and potential injuries.
Innovation Solution
A process involving a vertical or slightly inclined feeding pipe with an upflow of air/nitrogen created by a vacuum system slows down particles as they fall, minimizing impact velocity and avoiding physical obstructions within the pipe, allowing for controlled and efficient loading of ceramic particles into the reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If particles are poured from the top of the reactor, then loading speed is improved, but particle breakage increases due to high impact velocity
Solution Approach 1:
A flexible sock is introduced as an intermediary medium between the hopper and the reactor bottom. The sock receives particles from the hopper and transports them to the loading point, allowing controlled deceleration through twisting and friction along the sock walls, thereby reducing impact velocity while maintaining loading efficiency
Solution Approach 2:
Air or nitrogen gas is used to fluidize and transport particles through the flexible sock. The gas flow controls particle movement and deceleration, enabling smooth transport without mechanical contact that could cause breakage, while maintaining rapid loading rates
2Strength
If the sock is twisted to slow down particles by friction, then particle breakage is reduced, but loading rate decreases
Solution Approach 1:
The sock is designed to be dynamically adjustable in its twisting state. The degree of twisting can be modified during operation to optimize the balance between particle protection (reduced twisting for faster loading) and particle integrity (increased twisting for slower, gentler loading), allowing real-time adaptation to loading requirements
Solution Approach 2:
Gas flow through the sock provides additional control over particle transport speed independent of sock twisting. By adjusting gas flow rate, the system can maintain high loading rates even when the sock is twisted to protect particles, as the pneumatic force compensates for the friction-induced slowing
3Strength
If the sock is filled slowly from top to bottom, then particle breakage is reduced, but loading duration increases
Solution Approach 1:
The flexible sock enables continuous particle flow from the hopper to the reactor bottom throughout the loading process. Unlike batch filling methods that require stopping and starting, the sock maintains uninterrupted particle transport, eliminating idle time while keeping impact velocities low through continuous frictional deceleration along the sock length
Solution Approach 2:
The sock acts as a continuous intermediary conveyor that bridges the hopper and reactor bottom. Its flexible nature allows it to conform to the reactor geometry and maintain continuous contact with particle flow, enabling uninterrupted loading at controlled speeds without the need for batch operations
4Reliability
If a rigid pipe is used to prevent sock rupture, then safety is improved, but device complexity increases
Solution Approach 1:
The patent uses a flexible sock made of durable, rupture-resistant material instead of a rigid pipe. The flexibility allows the sock to conform to reactor geometry and absorb mechanical stresses without breaking, while the material selection ensures resistance to rupture under loading conditions, providing safety without the complexity of rigid structural support
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 method significantly reduces particle breakage, enhances loading speed, and improves safety by controlling the impact velocity and removing dust, enabling efficient and safe loading of ceramic particles into high reactors.
Implementation Method 1
inducing an upflow of air and/or nitrogen into said feeding pipe from the bottom opening to the top thereof by using a vacuum system to suck air and/or nitrogen via a chamber attached to the top of the feeding pipe
Implementation Method 2
using a vacuum system to suck air and/or nitrogen via a chamber attached to the top of the feeding pipe
Implementation Method 3
the particles are fed into the pipe at the upper part thereof in such a way that the particles fall downwardly counter currently to said upflow of air and/or nitrogen
Implementation Method 4
Simply pouring the particles from the top of the reactor will result in each particle accelerating under the force of gravity and gaining in vertical falling velocity over the height of the reactor
Data Source
Figure 1
AI summary
The present invention concerns a process for loading particulate material (2) into a vertical container (1), which comprises: - introducing into the container (1) along a substantial height thereof a feeding pipe (4) that is open at its bottom part, said feeding pipe (4) being vertical or having an angle of inclination with regard to vertical of at most 15 degrees, - inducing an upflow of air and/or nitrogen into said pipe (4) from the bottom opening to the top thereof, and - pouring said particulate material (2) into the pipe at the upper part thereof in such a way that said particulate material (2) falls downwardly counter currently to said upflow of air and/or nitrogen. According to the invention, no physical device or air-supplying conduit is present inside the inner section of the feeding pipe (4). This process can be used for example for loading support material such as ceramic balls into the bottom of a reactor in the fields of (petro) chemistry and petroleum refining. It allows a rapid, safe and efficient loading, without breakage of the particles.