Cement Kiln Burner Combustion of Solid Waste
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cement kiln burner devices face challenges in maintaining combustible solid wastes, such as waste plastics, in a floating state and ensuring complete combustion, particularly for materials with smaller bulk specific gravities and larger sizes, leading to issues like landing combustion and abnormal clinkering reactions.
Innovation Solution
A 4-channel cement kiln burner device with specific flow channel configurations, including a powdered-solid-fuel flow channel, three air flow channels for swirling and straight air flows, and a combustible-solid-waste flow channel, where the second air flow channel has intermittently arranged opening and closed portions to enhance turbulence and oxygen supply, allowing for efficient combustion of combustible solid wastes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If combustible solid wastes are used as supplemental fuels in main burners, then the heat quantity and fuel efficiency are improved, but landing combustion occurs causing reducing calcination and abnormal clinkering reactions
Solution Approach 1:
The air supply system is segmented into multiple channels (first air supply channel, second air supply channel, third air supply channel) with different functions. The first channel provides primary air for combustion, the second channel supplies air to maintain floating state, and the third channel provides additional combustion air. This segmentation allows precise control of air distribution to prevent landing combustion while maintaining fuel efficiency.
Solution Approach 2:
The burner device preliminarily processes combustible solid wastes by atomizing them into fine particles and mixing them with primary air before injection into the kiln. This preliminary preparation ensures that the fuel is in an optimal state for combustion, improving fuel efficiency while reducing the risk of incomplete combustion and landing combustion through proper air-fuel mixing.
2Adaptability or versatility
If combustible solid wastes with smaller bulk specific gravities and larger sizes are used, then the fuel versatility is improved, but the ability to maintain floating state and complete combustion deteriorates
Solution Approach 1:
Different air supply channels provide different local conditions for combustion. The first air supply channel provides high-velocity primary air for atomization and initial combustion. The second air supply channel provides controlled air supply in the combustion zone to maintain floating state of larger particles. The third air supply channel provides additional oxygen for complete combustion. This local quality differentiation enables reliable combustion of diverse fuel types with varying physical properties.
Solution Approach 2:
The burner device changes key parameters including air velocity, air temperature, and air distribution ratios across different channels to optimize combustion conditions. By adjusting these parameters, the system can adapt to different fuel types and sizes while maintaining complete combustion and preventing landing combustion through optimized air-fuel mixing and combustion zone conditions.
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 device effectively prevents landing combustion of combustible solid wastes, enabling their efficient use as supplemental fuels without degrading cement clinker quality by maintaining them in a floating state and ensuring complete combustion.
Implementation Method 1
a first air supply channel including means for swirling a primary air flow
Implementation Method 2
techniques for maintaining a combustible solid waste at a floating state in a cement kiln for a longer time period
Implementation Method 3
a third air supply channel including means for swirling a combustion air flow
Implementation Method 4
combusting a major part of a combustible solid waste in a floating state
Implementation Method 5
the second air flow channel includes an opening portion forming a port for injecting an air flow
Data Source
AI summary
A cement kiln burner device includes a powdered-solid-fuel flow channel having means for swirling a powdered-solid-fuel flow; a first air flow channel placed outside the powdered-solid-fuel flow channel having means for swirling an air flow; a second air flow channel placed outside the first air flow channel having means for straightly forwarding an air flow; a third air flow channel placed inside the powdered-solid-fuel flow channel having means for swirling an air flow; and a combustible-solid-waste flow channel placed inside the third air flow channel. The second air flow channel includes an opening portion forming a port for injecting an air flow, and a closed portion covered for preventing an air flow from passing therethrough. The opening portion and the closed portion are alternately arranged in a circumferential direction.