Powder Transfer Device Gas Slider Control
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Solution Overview
Problem
Existing powder transfer devices in vertical multistage fluidized bed reactors lack control over powder transfer rate, primarily due to mechanical shape factors, and the introduction of mechanical valves complicates the system.
Innovation Solution
A powder transfer device featuring a downcomer and a gas slider with a gas dispersion plate that controls powder transfer by varying the gas flow, allowing for easy adjustment of the transfer rate through fluidization and non-fluidization states, eliminating the need for moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical valve is installed on the downcomer to control powder flow rate, then the powder transfer rate can be controlled, but the device structure becomes complicated and various problems occur
Solution Approach 1:
The patent replaces the mechanical valve system with a gas flow control system. Gas is introduced through the gas dispersion plate to fluidize the powder in the downcomer, and by controlling the gas flow rate, the powder transfer rate is controlled without any mechanical moving parts. This substitutes a mechanical control system with a pneumatic control system, eliminating the complexity and reliability issues associated with mechanical valves.
Solution Approach 2:
The patent uses gas (pneumatics) to control powder flow. A gas dispersion plate with multiple gas outlets is installed at the bottom of the downcomer, and gas is blown through the powder to create a fluidized state. The powder transfer rate is controlled by adjusting the gas flow rate, leveraging pneumatic principles to achieve flow control without mechanical components.
2Ease of operation
If the downcomer diameter and positions are adjusted to control powder transfer rate, then the transfer rate can be modified, but the control flexibility is limited and requires structural changes
Solution Approach 1:
The patent changes the operational parameter (gas flow rate) rather than the structural parameters (downcomer diameter, positions). By adjusting the gas flow rate through the gas dispersion plate, the powder transfer rate can be continuously and flexibly controlled without any structural modifications to the downcomer, providing superior adaptability and ease of operation.
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
Enables precise control over powder transfer rates between stages, ensuring stable operation and preventing issues like polymer sticking, with a simple construction that avoids mechanical valve complications.
Implementation Method 1
when gas is blown from the gas dispersion plate in the gas slider so as to thoroughly fluidize powder that is present between the bottom end of the downcomer and the gas dispersion plate
Implementation Method 2
powder in an upper stage which has dropped into a downcomer from an opening in the top end of the downcomer falls gravitationally through the downcomer
Data Source
AI summary
The present invention provides a powder transfer device that has a simple construction, yet enables the powder discharge rate to be easily controlled, as well as a polyolefin powder production process using such a powder transfer device. A powder transfer device includes a downcomer which extends downward, and a gas slider situated below the downcomer. The gas slider has, on a side thereof facing an opening at a bottom end of the downcomer, a gas dispersion plate in which a plurality of gas outlets are formed.