基于动力学原理,分析浸水煤的低温氧化阶段参数
Yun-Chuan Bu1, Hui-Yong Niu2, Gong-da Wang1
1Univ Sci & Technol Beijing, Sch Civil & Resources Engn, Beijing 100083, China.
The Science of the total environment
|June 16, 2024
概括
在不同氧气水平下研究煤炭自燃 (CSC) 发现了关键温度值和氧化阶段. 较高的氧度加快了CO的产生和释放热量,增加了CSC的风险,特别是在预氧化煤炭中.
科学领域:
- * 地质化学和材料科学
- * 化学工程和工艺安全
背景情况:
- *自发燃煤 (CSC) 在煤矿中构成重大风险,导致重大灾难.
- *了解煤炭的阶段性氧化动力学对于防止此类事件至关重要.
研究的目的:
- *分析不同度氧气 (21%,15%,10%,5%和3%) 的煤的阶段氧化动力参数.
- * 确定低温氧化 (LTO) 的特征温度和阶段,以及它们与氧气水平的相关性.
- * 调查氧化前和浸水对煤炭自燃风险的影响.
主要方法:
- *使用编程温度测试系统来分析煤炭样本.
- *监测温度增加率,炉炭温度差异和氧气消耗.
- *量化CO生产和温度灵敏系数,以定义氧化阶段.
主要成果:
- *根据CO产量和温度灵敏度确定了三个特征温度和四个LTO阶段.
- * 观察到 CO 释放和氧气消耗率增加,在临界温度 (Tc) 处氧气度更高.
- * 发现氧气度与二氧化碳产生,最大加热速率和热释放速率之间存在正相关性,在较高氧气水平下,激活能量降低.
结论:
- * 在低氧度的预氧化,浸水煤具有较高的自燃风险,因为交叉点.
- *这项研究提供了一个理论框架,用于对水浸煤中的自发燃烧进行分阶段控制.
- *这些发现对于制定有效的防火安全措施至关重要.
相关概念视频
Oxidation of Alcohols
12.9K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
12.9K
Constant Volume Calorimetry
27.1K
Calorimeters are useful to determine the heat released or absorbed by a chemical reaction. Coffee cup calorimeters are designed to operate at constant (atmospheric) pressure and are convenient to measure heat flow (or enthalpy change) accompanying processes that occur in solution at constant pressure. A different type of calorimeter that operates at constant volume, colloquially known as a bomb calorimeter, is used to measure the energy produced by reactions that yield large amounts of heat and...
27.1K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
11.3K
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
11.3K
Sample Preparation for Analysis: Advanced Techniques
321
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
321
Temperature Dependence on Reaction Rate
81.5K
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
81.5K
Phase Diagrams
40.5K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
40.5K


