文献类型：期刊文献

英文题名：Computational fluid dynamics-based steam cracking furnace optimization using feedstock flow distribution

作者：Zhang, Yu[1,2];Reyniers, Pieter A.[2];Schietekat, Carl M.[2];Van Geem, Kevin M.[2];Marin, Guy B.[2];Du, Wenli[1];Qian, Feng[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Univ Ghent, Chem Technol Lab, Technol Pk 914, B-9052 Ghent, Belgium

年份：2017

卷号：63

期号：7

起止页码：3199

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20170803383104);WOS:【SCI-EXPANDED(收录号:WOS:000402909600061)】；

基金：The computational resources and services used in this work were provided by the VSC (Flemish Supercomputer Center), funded by the Research Foundation Flanders (FWO) and the Flemish Government-department EWI. The financial support from the BOF Bilateral Scientific Cooperation (ECUST/LCT), the Long Term Structural Methusalem Funding by the Flemish Government-grant number BOF09/01M00409, and the China Scholarship Council (CSC) are acknowledged. This work is also supported by National Natural Science Foundation of China (Key Program: 61333010), National Natural Science Foundation of China (Major Program: 61590923) and National Natural Science Foundation of China (21276078) and the 111 Project (B08021). PAR acknowledges financial support from a doctoral fellowship from the Fund for Scientific Research Flanders (FWO).

语种：英文

外文关键词：computational fluid dynamics; steam cracking; optimization; flow rate distribution; economics; ethylene

摘要：Nonuniform temperature fields in steam cracking furnaces caused by geometry factors such as burner positions, shadow effects, and asymmetry of the reactor coil layout are detrimental for product yields and run lengths. The techniques of adjusting burner firing (zone firing) and feedstock mass flow rate (pass balancing) have been practiced industrially to mitigate these effects but could only reduce the nonuniformities between the so-called modules (a group of many coils). An extension of the pass balancing methodology is presented to further minimize the intra-module nonuniformities, that is, variation between the coils within a module, in floor fired furnaces. Coupled furnace-reactor computational fluid dynamics-based simulations of an industrial ultraselective conversion (USC) furnace were performed to evaluate four different feedstock flow distribution schemes, realizing equal values for coil outlet temperature, propene/ethene mass ratio, maximum coking rate and maximum tube metal temperature (TMT), respectively, over all the reactor coils. It is shown that feedstock flow distribution creates a larger operating window and extends the run length. Out of the four cases, the coking rate as criterion leads to the highest yearly production capacity for ethene and propene. Uniform maximum coking rates boost the annual production capacity of the USC furnace with a nameplate ethene capacity of 130 10(3) metric tons per year with 1000 metric tons for ethene and 730 metric tons for propene. For industrial application, achieving uniform maximum TMT is more practical due to its measurability by advanced laser-based techniques. Most steam cracking furnaces can be retrofitted by optimizing the dimensions of venturi nozzles that regulate the feedstock flow to the coils. (c) 2017 American Institute of Chemical Engineers AIChE J, 63: 3199-3213, 2017