在泡流体化床中石膏化和分解的反应特征
Pengxing Yuan1, Meng Li2,3, Jun Hu4
1Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 211189, China.
ACS omega
|August 19, 2024
概括
这项研究优化了化 (PG) 在流体化床反应堆中的分解,达到92%以上的分解. 连续加工比批量加工方法产生的硫化 (CaS) 产量更高.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 石 (PG) 是一个主要的工业副产品,需要有效的价值化.
- 高温烧焦是将PG转化为有价值的材料的关键步骤.
- 流化床反应堆为高温化学过程提供了优势.
研究的目的:
- 设计和研究一个泡流化床反应堆用于化 (PG) 化和分解.
- 确定PG分解和硫化 (CaS) 生产的最佳条件.
- 为了比较批量与连续PG分解过程的效率.
主要方法:
- 使用电加热的泡流体化床反应堆,配有升降排放管,用于灵活的养模式.
- 研究的批量测试使用特定的石 (PG) 和煤颗粒大小,PG/煤质量比,温度 (1100°C).
- 在优化参数下进行了120分钟的热状态连续测试,每30分钟进行一次和放电.
主要成果:
- 在最佳的批量条件下 (0.27-0.55毫米PG,0.55-0.83毫米煤,5: 1PG/煤比,1100°C,30分钟) 导致PG完全分解为CaS和Ca2(SiO4).
- 批量和连续测试都实现了超过92%的PG分解率.
- 与批量模式 (64.49%) 相比,连续分解产生更高的CaS产量 (71.20%),观察到粒子聚合.
结论:
- 开发的泡流化床反应器有效地处理 (PG) 在高温下分解.
- 流化床反应堆中的连续处理提供了优越的CaS产量和工艺优势,而不是批量方法.
- 优化的条件促进了高效的PG分解和像CaS这样的有价值的固体产品的形成.
相关概念视频
Hydration of Cement
207
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
207
Factors Affecting Solubility
33.3K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.3K
Washing, Drying, and Ignition of Precipitates
896
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
896
The Phosphorus Cycle
36.6K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
36.6K
Calculating Standard Free Energy Changes
21.0K
The free energy change for a reaction that occurs under the standard conditions of 1 bar pressure and at 298 K is called the standard free energy change. Since free energy is a state function, its value depends only on the conditions of the initial and final states of the system. A convenient and common approach to the calculation of free energy changes for physical and chemical reactions is by use of widely available compilations of standard state thermodynamic data. One method involves the...
21.0K
Strength and Heat of Hydration
223
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...
223


