Method and system for gas transfer type fine powder quantitative feeding
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Solution Overview
Problem
Fine powders with extremely light mass tend to become electrostatically charged during gas transfer, leading to adhesion to the transfer passage and eventual blockage, which existing solutions like conductive materials or ion neutralization fail to adequately address, especially in dry environments where high water content is avoided to maintain powder fluidity.
Innovation Solution
A gas transfer type fine powder quantitative feeding method and system that adjusts the water content of the carrier gas to suppress static electricity, using a humidifying unit with a humidity measuring sensor and ultrasonic vibration mechanism to control humidity within a specific range, ensuring the scattering time of static electricity is between 0 to 10 seconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the carrier gas is dried to maintain powder fluidity, then powder fluidity is improved, but static electricity generation increases causing powder adhesion to transfer passage
Solution Approach 1:
The invention changes the water content parameter of the carrier gas from completely dry state to a controlled humid state. By adjusting the water content to specific ranges (relative humidity 10-50% or absolute humidity 2-10 g/m³), the invention reduces static electricity generation while maintaining adequate powder fluidity, resolving the contradiction between these two requirements
Solution Approach 2:
The invention converts the traditionally harmful effect of water in carrier gas (causing powder clumping) into a beneficial effect (reducing static electricity). By introducing controlled amounts of water vapor, the carrier gas now serves dual purposes: maintaining powder fluidity and suppressing electrostatic charge accumulation during transfer
2Object-generated harmful factors
If conductive material is used for transfer passage to release static electricity, then static electricity is reduced, but transfer passage durability decreases due to powder abrasion
Solution Approach 1:
The invention replaces the mechanical/conductive solution (using conductive transfer passage walls to dissipate static charge) with a gaseous solution (humidified carrier gas to suppress static electricity generation). This substitution eliminates direct contact between powder and conductive walls, preventing abrasion while maintaining static control
Solution Approach 2:
The humidified carrier gas acts as an intermediary medium that suppresses static electricity generation during powder transfer. Instead of relying on the transfer passage wall properties, the controlled water vapor in the carrier gas mediates the electrostatic interaction, reducing charge accumulation without requiring conductive passage materials
3Object-generated harmful factors
If water content in carrier gas is increased to suppress static electricity, then static electricity is reduced, but powder adhesion increases due to liquid cross-linking
Solution Approach 1:
The invention precisely controls the water content parameter within specific ranges (relative humidity 10-50% or absolute humidity 2-10 g/m³). This controlled parameter change is sufficient to suppress static electricity generation but insufficient to cause liquid cross-linking and powder adhesion, thereby resolving the contradiction between these opposing effects
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 allows for the stable and quantitative transfer of fine powders by reducing static electricity, preventing blockages and maintaining powder fluidity, even for powders with low fluidity, while avoiding issues related to high humidity that could cause adhesion.
Implementation Method 1
a humidifying unit comprising: a humidity measuring sensor (19); a humidifying chamber (80) for humidifying a carrier gas; a humidified carrier gas feed nozzle (83) for feeding the humidified carrier gas to the device; wherein the humidifying chamber comprises: a liquid storing tank (81) for storing liquid water for humidifying the carrier gas; an ultrasonic vibration mechanism (82) for atomizing the liquid water;
Implementation Method 2
a humidifying unit comprising: a humidity measuring sensor (19)
Implementation Method 3
when a mixed fluid of the fine powder and the carrier gas is transferred from the gas transfer type fine powder quantitative feeder to the fine powder using device, a water content in the carrier gas is adjusted to suppress an amount of static electricity that is generated in the mixed fluid
Data Source
AI summary
To provide a method for quantitatively and stably feeding fine powder and a system for carrying out the method. The present invention is characterized in that a gas transfer type fine powder quantitative feeding method for quantitatively transferring and feeding fine powder filled in a gas transfer type fine powder quantitative feeder to a fine powder using device by a carrier gas, whereinwhen a mixed fluid of the fine powder and the carrier gas is transferred from the gas transfer type fine powder quantitative feeder to the fine powder using device, a water content in the carrier gas is adjusted to suppress an amount of static electricity that is generated in the mixed fluid.