评估用于水泥生产的等离子体加热旋转炉的传热条件
Alice Fakt1, Adrian Gunnarsson1, Klas Andersson1
1Department of Space, Earth and Environment, Chalmers University of Technology, Hörsalsvägen 7B, SE-412 96 Gothenburg, Sweden.
Industrial & engineering chemistry research
|April 28, 2025
概括
这项研究评估了用于水泥生产的热等离子体,发现倾斜等离子体和注入颗粒可以增强热传递. 这种组合对于增加对水泥床材料传递的热量是最有希望的.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 等离子体物理学的物理学
背景情况:
- 水泥生产需要高温 (1450°C),传统上通过燃料燃烧与辐射主导的热传递来满足.
- 用热等离子体取代火焰,由于没有辐射燃料颗粒,因此存在热传递挑战.
研究的目的:
- 评估使用电气产生的热等离子体作为用于生产水泥的旋转炉中的热源的可行性.
- 模拟和分析等离子体加热旋转炉中的传热条件.
主要方法:
- 在一个由8MW热等离子体加热的示范规模旋转炉中建模热传递.
- 估计使用50kW二氧化碳等离子火测量的等离子体温度概况.
- 检查操作和尺寸参数对传热的影响.
主要成果:
- 与传统燃烧相比,等离子体加热显著改变了传热动态.
- 向床倾斜等离子体,可以增强对流热传递.
- 将颗粒物注入等离子体加热的气体中,可以改善辐射热传递.
结论:
- 将等离子体倾斜和将粒子注入等离子体加热气体的组合是最有效的策略.
- 这种结合的方法显示了增加热传输到水泥床材料在等离子体加热炉的承诺.
相关概念视频
01:29Strength and Heat of Hydration
187
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
187
01:15Fineness of Cement
111
The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
Direct...
111