Two-Stage Refuse Gasification for High Moisture Waste
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Solution Overview
Problem
Conventional combustion systems for municipal solid waste face challenges with high moisture content refuse, leading to unstable combustion, increased energy requirements, and the production of undesirable emissions like NOx, carbon monoxide, and dioxins, due to limitations in controlling gas flow and temperature.
Innovation Solution
A two-stage refuse gasification combustion system that employs a moving grate, primary and secondary air sources, and advanced control systems to regulate oxidant supply and temperature, utilizing a first and second gasifier with a post-combustor, ash collector, and sophisticated gas regulators to optimize combustion efficiency and reduce harmful emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high moisture content refuse is combusted in conventional systems, then energy recovery is attempted, but combustion stability deteriorates and harmful emissions increase
Solution Approach 1:
The combustion process is divided into two distinct stages: a drying stage where moisture is removed at lower temperatures, and a combustion stage where dry refuse is burned at higher temperatures. This segmentation allows each stage to be optimized independently, ensuring stable combustion even with high moisture content refuse by preventing the interference of moisture during the high-temperature combustion phase
Solution Approach 2:
The refuse is pre-dried in the first chamber before entering the combustion chamber. This preliminary action of removing moisture beforehand prevents the negative effects of high moisture content during combustion, such as temperature reduction and combustion instability, thereby enabling reliable energy recovery
2Use of energy by moving object
If high moisture content refuse is combusted, then energy recovery is attempted, but harmful emissions increase
Solution Approach 1:
By separating the drying and combustion processes into different chambers, the system prevents incomplete combustion that would occur if moisture were present during burning. This segmentation ensures that combustion occurs only after moisture removal, thereby reducing harmful emissions while maintaining energy recovery
Solution Approach 2:
The preliminary drying action in the first chamber removes moisture before combustion, creating conditions for complete and clean burning in the second chamber. This preliminary preparation prevents the formation of harmful emissions by ensuring dry refuse enters the combustion zone
3Productivity
If gas flow is increased to dry high moisture refuse, then drying effectiveness improves, but system complexity and energy requirements increase
Solution Approach 1:
The system segments the drying function into a dedicated first chamber, separating it from the combustion chamber. This allows drying to occur with controlled, lower gas flow rates without compromising the combustion process, thereby maintaining drying effectiveness while avoiding the need for high gas flow rates that would increase system complexity
Solution Approach 2:
The first chamber acts as an intermediary zone between the refuse input and the combustion chamber. It performs the moisture removal function separately, allowing the combustion chamber to operate independently with optimized conditions, thereby simplifying the overall system control while maintaining effective drying
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 efficiently processes refuse with high moisture content, minimizing undesirable emissions and enhancing energy conversion efficiency by precisely controlling gasification and combustion processes, thereby creating a more durable and efficient energy conversion system.
Implementation Method 1
a first gasifier (102) for receiving所述 refuse and processing所述 refuse to a volatiles free state
Implementation Method 2
a post-combustor (104) for receiving所述 gas and所述 volatiles free refuse and combusting所述 gas and所述 volatiles free refuse
Data Source
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AI summary
A two stage refuse gasification combustion system for processing refuse is disclosed. The system may contain features such as an advancer, a first and second gasifier, a drier, a gas regulator, and a post combustor. Additionally, methods for regulating gas and advancing refuse through a two stage refuse gasification combustion system are disclosed.