Investigation of reactor wall coating due to electrostatic charging in a pilot plant high-pressure gas-solid fluidization system.

对中试装置高压气固流化系统中静电充电引起的反应器壁涂层的研究。

• 批准号: 469535-2014
• 负责人: Mehrani, Poupak
• 金额: $ 0.66万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=577421
• 关键词: Investigation; reactor; wall; coating; due

One major problem in gas-solid fluidized bed reactors is particle agglomeration and reactor wall fouling, which is known to be as a result of generation of electrostatic charges due to vigorous mixing of solid particles in such systems. The significant impact of this phenomenon has been reported in industries such as polymer, and oil and gas. In polyethylene gas-solid fluidized bed reactors, electrostatic adhesion due to highly charged particles results in formation of undesired polymer sheets on the reactor wall, leading to frequent process shut downs for reactor clean up, loss of production; and thus, significant economic losses. Since 2006, I have set up two fluidization laboratories at the University of Ottawa, Chemical and Biological Engineering Department that consist of two pilot plant, one atmospheric and high-pressure, fluidization systems, and have established an extensive experimental program to gain a better understanding of the reactor wall fouling in gas-solid fluidized beds with specific application in polyethylene production. My research team has been successful in developing a new and unique online electrostatic charge measurement technique that has been implemented in both fluidization systems. To study the electrostatic phenomenon in gas-solid fluidized beds, it is essential for the experimental work to be conducted under similar operating conditions to those of the industrial rectors. Thus, the focus of the proposed research is to conduct a comprehensive study of electrostatic charging mechanisms of polyethylene reactors in the high-pressure facility which is capable of operating under higher pressures and temperature (up to 25 bar and 100C). Some of the specific parameters to be investigated include the effects of operating pressure, relationship between bubble dynamics and degree of reactor fouling, fluidization gas velocity, as well as, fluidization of mixture of polyethylene and its catalyst.

气-固流化床反应器中的一个主要问题是颗粒附聚和反应器壁结垢，已知这是由于此类系统中固体颗粒的剧烈混合而产生静电荷的结果。据报道，这种现象对聚合物、石油和天然气等行业产生了重大影响。在聚乙烯气-固流化床反应器中，高带电粒子产生的静电粘附导致反应器壁上形成不需要的聚合物片，从而导致频繁的工艺停机以进行反应器清理、生产损失；从而造成重大的经济损失。自 2006 年以来，我在渥太华大学化学与生物工程系建立了两个流化实验室，其中包括两个中试装置、一个常压和高压流化系统，并建立了广泛的实验计划以更好地了解气固流化床中反应器壁结垢的研究及其在聚乙烯生产中的具体应用。我的研究团队成功开发了一种新的、独特的在线静电荷测量技术，该技术已在两个流化系统中实施。 为了研究气固流化床中的静电现象，实验工作必须在与工业反应器相似的操作条件下进行。因此，本研究的重点是对高压设备中聚乙烯反应器的静电充电机制进行全面研究，该设备能够在更高的压力和温度（高达25巴和100℃）下运行。要研究的一些具体参数包括操作压力的影响、气泡动力学与反应器结垢程度之间的关系、流化气体速度以及聚乙烯及其催化剂的混合物的流化。