Conveying Pipeline Segmentation for Stable Gas-Solid Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pneumatic conveyance systems for carbonaceous fuels into gasifiers experience unstable flow rates, leading to temperature fluctuations and reduced performance and service life of gasifiers due to non-uniform introduction of carbonaceous fuels.
Innovation Solution
A conveying apparatus with a conveying pipeline featuring an expanding portion, an intermediate portion, and a shrinking portion, along with a supplementary gas pipeline, is used to stabilize the flow of gas-solid mixtures by adjusting the velocity and mixing of gases and solids, ensuring uniform and stable flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pneumatic conveyance systems are used to convey carbonaceous fuels into gasifiers, then the system structure is simple, but the flow rate of carbonaceous fuels becomes unstable leading to temperature fluctuations
Solution Approach 1:
The conveying pipeline is segmented into three distinct portions: an expanding portion, an intermediate portion, and a shrinking portion. Each portion serves a specific function in stabilizing the flow of gas-solid mixture, transforming the unstable plug flow into a stable uniform flow without requiring complex external control systems.
Solution Approach 2:
The patent changes the geometric parameters of the conveying pipeline by introducing expanding and shrinking portions with specific angle ranges (5-15 degrees for expanding, 10-20 degrees for shrinking). These parameter changes modify the flow characteristics of the gas-solid mixture, enabling stable flow rates while maintaining system simplicity.
2Reliability
If pressure differences are used to convey gas solid mixture from storage tanks into gasifiers, then the conveying mechanism is simple, but the flow becomes unstable with non-uniform flow rates
Solution Approach 1:
The intermediate portion of the conveying pipeline acts as a mediator between the expanding and shrinking portions. It provides a transition zone where the gas-solid mixture can adjust its flow pattern, ensuring smooth transformation from expanded flow to contracted flow and maintaining flow stability throughout the conveying process.
Solution Approach 2:
The patent employs curved transitions in the expanding and shrinking portions rather than sharp angles. The gradual curvature changes (with specified angle ranges) reduce flow separation and turbulence, enabling stable flow of gas-solid mixture while preventing particle deposition and maintaining uniform flow rates.
3Reliability
If unstable flow rates of carbonaceous fuels are introduced into gasifiers, then no additional conveying components are needed, but temperature fluctuations occur reducing gasifier performance and service life
Solution Approach 1:
The expanding portion of the conveying pipeline performs preliminary action by expanding the gas-solid mixture flow before it enters the intermediate and shrinking portions. This pre-expansion stabilizes the flow pattern and prevents plug flow formation, ensuring uniform flow rates reach the gasifier which eliminates temperature fluctuations and protects gasifier performance.
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 solution achieves stable and uniform flow rates of carbonaceous fuels into gasifiers, improving gasification performance and extending the service life of gasifiers by ensuring consistent introduction of carbonaceous fuels.
Implementation Method 1
the pressures of the storage tanks increase to desired levels, which are higher than pressures in the gasifiers so as to generate pressure differences between such storage tanks and gasifiers. A gas solid mixture then may be conveyed from the storage tanks into the gasifiers through the conveying pipeline in virtue of the pressure differences.
Implementation Method 2
The conveying pipeline defines an inlet and an outlet, and comprises an expanding portion defining the inlet, a shrinking portion defining the outlet, and an intermediate portion disposed between and in fluid communication with the expanding portion and the shrinking portion
Data Source
AI summary
A conveying apparatus is provided. The conveying apparatus comprises a conveying pipeline and a supplementary gas pipeline extending into the conveying pipeline. The conveying pipeline defines an inlet and an outlet, and comprises an expanding portion defining the inlet, a shrinking portion defining the outlet, and an intermediate portion disposed between and in fluid communication with the expanding portion and the shrinking portion. A conveying apparatus and a conveying method are also presented.