Gravity Powder Injection with Localized Gas Blowing
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Solution Overview
Problem
Existing powder injection systems face challenges in achieving stable and reproducible dense phase powder injection with minimal gas usage, as they often require high gas flow rates, leading to instabilities and dependence on gas flow rates for solid flow control, which is inefficient and not suitable for cohesive powders.
Innovation Solution
A dense phase powder supply system incorporating a dosing device, a truncated cone injection cone, and a straight gas blowing tube with axial or radial holes, allowing independent control of gas and solid flow rates, optimizing gas velocities and minimizing gas consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high gas flow rates are used to promote powder flow and increase injection speed, then powder flow stability and injection speed are improved, but gas consumption increases and solid volume fraction decreases
Solution Approach 1:
The gas blowing tube introduces gas locally at the lower end of the injection cone rather than uniformly throughout. The tube has holes positioned at a specific location (lower end) to provide localized gas assistance where it is most needed to promote powder flow and increase injection speed, while minimizing overall gas consumption by avoiding unnecessary gas introduction in other regions of the cone.
Solution Approach 2:
The gas introduction system is segmented into a specific tube structure with holes positioned at the lower end of the injection cone. This segmentation allows gas to be introduced at a specific location rather than uniformly throughout the entire cone, enabling precise control over where gas assistance is applied to promote powder flow while minimizing total gas consumption.
2Ease of operation
If gas injection is used to pressurize and transport powder, then powder transport is improved, but the powder flow becomes highly diluted and incompatible with downstream thermochemical processes
Solution Approach 1:
Gas is introduced locally at the lower end of the injection cone through a positioned tube rather than uniformly throughout the cone. This localized gas assistance promotes powder flow and transport while minimizing the total quantity of gas mixed with the powder, thereby maintaining a higher solid volume fraction that is compatible with downstream thermochemical processes.
Solution Approach 2:
The gas injection system is segmented into a specific tube with holes at the lower end of the cone, allowing gas to be introduced only where needed to assist powder transport. This segmented approach prevents excessive gas-powder mixing throughout the entire cone, maintaining higher solid volume fractions suitable for downstream processes.
3Productivity
If gas flow rate is increased to accelerate cohesive powders, then powder flow is promoted and injection speed increases, but the system becomes dependent on gas flow rate for solid flow control and instabilities occur
Solution Approach 1:
Gas is introduced locally at the lower end of the injection cone through a positioned tube with specific hole placement. This localized gas assistance provides targeted promotion of powder flow without creating the instabilities associated with uniform high gas flow rates throughout the entire cone, thereby improving both productivity and flow stability.
Solution Approach 2:
The gas injection system is segmented into a tube with holes positioned at the lower end of the cone, providing gas assistance only where it is most effective for promoting powder flow. This segmentation prevents the gas flow rate from becoming the controlling factor for solid flow, reducing instabilities and improving overall system reliability.
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
The system achieves stable and reproducible powder injection with high gas velocities and solid volume fractions, reducing gas usage while maintaining powder flow stability, even with cohesive powders, by optimizing the design of the gas blowing tube and injection cone geometry.
Implementation Method 1
the addition of gas can prove advantageous or even essential in certain applications... a gas flow fulfills both the functions of assisting the flow and accelerating the biomass particles
Implementation Method 2
a device for injecting the powder by gravity, in the form of a truncated cone, arranged below the dosing device so as to receive by gravity the powder dosed
Data Source
Figure 1~5
Figure 6~8A
AI summary
Dense phase powder feeding system (1) comprising: - a dosing device (2), adapted to dose the powder according to a given average flow rate; - a gravity injection device (3) for the powder in the form of a truncated cone, arranged below the dosing device so as to receive the powder by gravity; - a gas blowing tube (4), the tube being straight and having at its lower end either a hole (41) opening along its axis, or a plurality of holes (42) opening radially to the axis of the tube substantially at the same longitudinal dimension (P) thereof; the straight tube being arranged in the truncated cone with its longitudinal axis X coinciding with that of the truncated cone, so as to be able to inject a gas locally through the hole(s) into the flow of powder falling by gravity into the injection cone.