Active Grate Rocker Dynamics for Gasification Material Transfer
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Solution Overview
Problem
Existing high temperature systems face issues with the effective and efficient transfer of materials from one chamber to another due to blocking or plugging, leading to uneven oxidation and flow disruptions in systems like partial oxidation gasification and vitrification processes.
Innovation Solution
An active grate with rotating elongated rockers, each with a curved lower surface and angled upper surface, alternately forming voids to facilitate material flow and crush large pieces, ensuring regular passage and reducing size for smooth transfer between chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a stationary grate is used in high temperature gasification systems, then the structure is simple and easy to manufacture, but material flow becomes uneven and blockages occur
Solution Approach 1:
The patent applies the dynamics principle by transforming the stationary grate into a moving grate that oscillates between horizontal and inclined positions. This dynamic movement prevents material blockages and ensures uniform material flow from the gasification chamber to the vitrification chamber, resolving the contradiction between structural simplicity and material transfer efficiency.
Solution Approach 2:
The grate performs periodic oscillation between horizontal and inclined positions during operation. This periodic action continuously updates the material flow pattern, preventing stagnation and blockages while maintaining relatively simple construction, thus improving productivity without significantly complicating the structure.
2Productivity
If large pieces of material are transferred between chambers, then the transfer process is efficient, but complete oxidation cannot be achieved
Solution Approach 1:
The moving grate dynamically adjusts the inclination angle to optimize both transfer efficiency and oxidation completeness. By periodically increasing the inclination angle, the grate ensures complete oxidation of material before transfer, then reduces the angle for efficient transfer, resolving the contradiction between transfer rate and oxidation completeness.
Solution Approach 2:
The system changes the operational parameters of the grate, specifically the inclination angle and movement speed, to achieve both efficient transfer and complete oxidation. By adjusting these parameters dynamically, the system maintains high productivity while ensuring reliable oxidation completion.
3Loss of time
If material flow is accelerated between chambers, then the process time is reduced, but uneven oxidation occurs
Solution Approach 1:
The grate employs periodic oscillation between horizontal and inclined positions to create alternating flow patterns. This periodic action ensures uniform oxidation by continuously updating the material distribution, while the overall movement rate can be adjusted to control residence time, resolving the contradiction between process time and oxidation uniformity.
Solution Approach 2:
The dynamic movement of the grate allows the system to optimize the balance between residence time and oxidation uniformity. By controlling the speed and pattern of the grate's movement, the system achieves complete oxidation within acceptable time frames, preventing both premature transfer and excessive residence time.
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 active grate ensures controlled and even material flow, preventing blockages and ensuring complete oxidation by agitating and crushing materials, thus enhancing the efficiency of energy recovery in high temperature gasification and vitrification systems.
Implementation Method 1
each with a curved lower surface and angled upper surface, alternately forming voids to facilitate material flow
Implementation Method 2
crush large pieces, ensuring regular passage and reducing size for smooth transfer between chambers
Data Source
AI summary
An improved active grate consisting of at least two elongated rockers positioned parallel to one and another, each rocker having a lower surface and an upper surface and configured to rotate back and forth about their longitudinal axis. Each individual rocker is further configured to rotate in the opposite direction of the adjacent rockers such that any pair of adjacent rockers alternately forms a void allowing material to pass through active grate when rotating in one direction into a first position, and closes the void when rotated in the opposite direction in a second position. The active grate finds particular utility in a combined gasification/vitrification waste treatment system, where it is used to pass partially oxidized materials from a gasification chamber to a vitrification chamber. The rockers include a coolant loop through the longitudinal axis of the rockers.