Evaluation of Turbulent Heat Transfer Enhancement in Steam-Cracking Furnace Tubes with Modified Internal Textures

改进内部织构的蒸汽裂解炉管强化湍流传热的评价

• 批准号: 549243-2019
• 负责人: Brinkerhoff, Joshua
• 金额: $ 10.62万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=701130
• 关键词: Evaluation; Turbulent; Heat; Transfer; Enhancement

Ethylene is a valuable chemical product essential to Canada's chemical and plastics industries. It is produced by reacting ethane gas and steam at very high temperatures in a steam cracking furnace. An undesirable by-product of the reaction is the gradual deposition of amorphous coke on the reactor walls. The deposits degrade the efficiency of the furnace and result in periodic shut downs of the steam cracking process to remove the coke deposits. Increasing the heat transfer rate from the reactor walls to the gases flowing inside the furnace can reduce the rate of coke formation. Unfortunately, conventional methods for increasing the heat transfer rate also increase the frictional pressure losses in the furnace, which translates into higher operational costs. This research project will investigate new methods for increasing heat transfer rates in ethylene production furnaces that yield only a minimal increase in frictional losses. In collaboration with Quantiam Technologies Inc., researchers from UBC Okanagan and University of Alberta will investigate heat transfer enhancement by placing patterned textures on the inner walls of the reactor. The textures protrude into the turbulent boundary layer and modify the turbulent motions that are responsible for mixing heat and momentum in the gas flow. By using high-fidelity computational fluid dynamics simulations and experimental measurements of the heat transfer and turbulent velocity field, the research project will evaluate the impact of various texture patterns on the heat transfer and frictional losses. The research will advance the current state of fundamental knowledge of turbulent flows with heat transfer. Commercial application of the research findings by Quantiam Technologies Inc. will help reduce the energy requirements and greenhouse gas emissions associated with ethylene production.

乙烯是加拿大化学和塑料行业必不可少的有价值的化学产品。它是通过在蒸汽开裂炉中非常高温下反应乙烷气和蒸汽产生的。反应的不良副产品是反应器壁上无定形可乐的逐渐沉积。沉积物降低了炉子的效率，并导致蒸汽开裂过程的定期关闭以去除可乐沉积物。从反应堆壁增加到炉内流动的气体的传热速率可以降低焦炭形成速率。不幸的是，提高传热速率的常规方法还增加了炉中的摩擦压力损失，这转化为更高的运营成本。该研究项目将研究提高乙烯生产炉中传热速率的新方法，这仅产生摩擦损失的最小增加。与Quantiam Technologies Inc.合作，UBC Okanagan和艾伯塔大学的研究人员将通过将图案化的纹理放在反应堆的内壁上来调查传热增强。纹理向湍流边界层伸出，并修改负责混合气流中热量和动量的湍流运动。通过使用高保真计算流体动力学模拟以及热传递和湍流速度场的实验测量，该研究项目将评估各种纹理模式对传热和摩擦损失的影响。这项研究将通过传热来提高湍流的基本知识的当前状态。 Quantiam Technologies Inc.对研究结果的商业应用将有助于减少与乙烯生产相关的能源需求和温室气体排放。