Gasifier Oxidizing Agent Ratio Control for Fuel Adaptability
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Solution Overview
Problem
Conventional gasification systems, such as IGCC systems, are limited in their ability to handle a wide range of carbon-containing materials due to narrow coal property ranges, and there is a need to expand the compatibility of gasifiers to accommodate various types and properties of coal and biomass.
Innovation Solution
A carbon-containing material gasification system with a gasifier comprising a combustion stage and a gasification stage, char providing means, material distributing ratio adjusting valve, oxidizing-agent distributing ratio adjusting valve, and a controlling apparatus that adjusts the ratio of distributing material and oxidizing agent based on material properties and ash content, using inert gas control to optimize oxidizing agent distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gasifier uses a fixed oxidizing agent distribution ratio, then the system operates stably for conventional coal types, but it cannot accommodate a wide range of carbon-containing materials with different properties
Solution Approach 1:
The patent implements dynamic adjustment of the oxidizing agent distribution ratio between the combustion stage and gasification stage based on the type and properties of carbon-containing material being gasified. The controlling apparatus automatically modifies the oxidizing agent split ratio in response to changes in fuel characteristics, enabling the system to adapt to different fuel types (coal, biomass, etc.) while maintaining stable operation. This dynamic control resolves the contradiction by making the oxidizing agent distribution flexible rather than fixed.
Solution Approach 2:
The patent changes the operational parameter of oxidizing agent distribution ratio according to the properties of carbon-containing material. By adjusting this parameter based on fuel type (e.g., higher ratio to combustion stage for high-ash coal, different ratio for biomass), the system achieves both wide adaptability to various fuels and stable operation for each specific fuel type.
2Adaptability or versatility
If the ratio of distributing pulverized coal to the gasification stage is increased to handle diverse materials, then the adaptability improves, but the change in material property causes operational instability
Solution Approach 1:
The controlling apparatus uses feedback control to monitor the actual gasification process and adjust the oxidizing agent distribution ratio accordingly. When handling diverse carbon-containing materials, the system receives feedback on process conditions and automatically modifies the oxidizing agent split between stages to maintain stable operation, preventing the instability that would result from fixed material distribution ratios.
Solution Approach 2:
The patent dynamically changes the oxidizing agent distribution parameter in response to changes in material properties. When the type of carbon-containing material changes (affecting ash content, reactivity, etc.), the system adjusts the oxidizing agent ratio to compensate, thereby maintaining stable operation across a wide range of materials.
3Ease of operation
If the oxidizing agent is distributed uniformly to both stages, then the system is simple to operate, but it cannot optimize combustion for different fuel properties
Solution Approach 1:
The controlling apparatus automatically determines and adjusts the optimal oxidizing agent distribution ratio based on the type of carbon-containing material being processed. The system serves itself by making intelligent decisions about parameter adjustment without requiring manual intervention, thereby maintaining ease of operation while achieving optimization for different fuel properties.
Solution Approach 2:
The patent automatically changes the oxidizing agent distribution parameter based on fuel type detection. The controlling apparatus selects appropriate parameter settings (oxidizing agent ratios) for different fuels, providing both simplicity of operation and optimization capability without requiring manual configuration.
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 stabilizes carbon-containing material combustion and enlarges the range of applicable carbon-containing fuels by dynamically adjusting oxidizing agent ratios and inert gas provision, ensuring stable operation regardless of fuel properties.
Implementation Method 1
a combustor is a part that blows an oxidizing agent and carbon-containing material into an inside of the gasifier from a combustor burner for carbon-containing material, also blows an oxidizing agent and char separated and recollected from gas generated in the gasifier from a combustor burner for char, and combusts the carbon-containing material and the char
Implementation Method 2
a redactor is a part that blows carbon-containing material into the inside of the gasifier from a redactor burner and thermally decomposes and gasifies the carbon-containing material using the high-temperature gas generated in the combustor
Data Source
AI summary
A carbon-containing material gasification system includes: a gasifier that includes a combustion stage and a gasification stage, and generates generated gas; char providing means that separates char from the generated gas, and provides the combustion stage with the char, the combustion stage including carbon-containing material combustion means and char combustion means; and distributing ratio setting means that sets, according to a ratio of distributing material defined in Expression [1], a ratio of distributing oxidizing agent defined in Expression [2] to be smaller as the ratio of distributing material increases.(ratio of distributing material)=(providing amount of the carbon-containing material for gasification stage)/(total providing amount of the carbon-containing material to gasifier) [1](ratio of distributing oxidizing agent)=(providing amount of the oxidizing agent to oxidize carbon-containing material for the combustion stage)/(total providing amount of the oxidizing agent to the combustion stage) [2]