通过热重力测量分析,峰值解卷和反应概况建模来探索Corymbia torelliana hydrochar燃烧动力学
Juliano Jose Mota da Rocha1, José Alair Santana Júnior2, Nádia Guimarães Sousa3
1Department of Forest Sciences, Federal University of Lavras, Lavras, Minas Gerais, 37200-000, Brazil.
Environmental science and pollution research international
|September 13, 2024
概括
水热碳化预处理通过降低燃烧激活能量来提高木材残留的能量质量. 这一过程优化了生物质用于能源应用,显示了燃烧动力学的显著改善.
科学领域:
- 生物质能源转换生物质能源转换
- 在热化学加工过程中进行热化学加工.
背景情况:
- 木材残留物是丰富的,但未充分利用的生物质资源.
- 提高生物质的能源质量对于可持续的能源生产至关重要.
研究的目的:
- 为了研究水热碳化 (HTC) 对木材残渣能源质量的影响.
- 分析原始生物质和碳化合物的燃烧动力学.
主要方法:
- 在180,220和240°C的水热碳化预处理.
- 在不同加热速率的O2大气中进行热重量测量分析.
- 确定全球激活能量和动力参数.
主要成果:
- HTC显著降低了生物质燃烧的全球激活能量,从112.49 kJ.mol-1降至94.85 kJ.mol-1.
- 对于原始生物质 (Avrami-Erofe'ev I,第1顺序) 和酸盐 (Avrami-Erofe'ev I,第2顺序) 确定了不同的转换函数1-α) [-ln-α) ] ^ 1 / 2).
- 确定了动力参数,显示实验数据和建模数据之间的良好一致.
结论:
- 水热碳化是一种有效的预处理方法,可以提高木材残留的能量质量.
- 该研究提供了对HTC后生物质燃烧的详细动力学理解.
- 基于这些发现,可以开发出优化的生物质转化途径.
相关概念视频
Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes
6.3K
The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
6.3K
Enthalpy and Heat of Reaction
8.3K
Combustion, commonly known as burning, is a reaction in which a substance reacts with an oxidizing agent, which in most cases is molecular oxygen, to liberate energy in the form of heat, light, or sound. The heat of combustion is also known as the enthalpy of combustion. The energy released when one mole of a substance undergoes complete combustion at constant pressure is called molar heat of combustion. Combustion reactions are exothermic; that is, they release energy, and their ΔH sign...
8.3K
Thermochemical Equations
28.3K
For a chemical reaction (the system) carried out at constant pressure – with the only work done caused by expansion or contraction – the enthalpy of reaction (also called the heat of reaction, ΔHrxn) is equal to the heat exchanged with the surroundings (qp).
28.3K
Thermal Sigmatropic Reactions: Overview
2.1K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in...
2.1K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Gas Chromatography: Introduction
1.5K
Gas chromatography (GC) is a technique for separating and analyzing volatile compounds in a sample. Its primary purpose is to identify and quantify components in complex mixtures, making it essential in fields such as environmental analysis, pharmaceuticals, and petrochemicals. GC is also called vapor-phase chromatography (VPC) or gas-liquid partition chromatography (GLPC).
In GC, a sample is vaporized and mixed with an inert carrier gas (the mobile phase), which transports it through a...
In GC, a sample is vaporized and mixed with an inert carrier gas (the mobile phase), which transports it through a...
1.5K


