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Determination of Safe Conditions and Simulation of Optimum Operations for Decoking of Ethane Pyrolysis Furnace

Author: ZhangYingYing
Tutor: XinFeng
School: Tianjin University
Course: Chemical Engineering
Keywords: Ethane cracking furnace Charred simulation Safe area calculation Operation Optimization
CLC: TQ221.211
Type: PhD thesis
Year: 2009
Downloads: 77
Quote: 0
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Abstract


This article is based on the analysis of ethane cracking furnace simulation study of the history, status quo and development trend, the numerical simulation and optimization of operating conditions of the heat transfer between ethane cracking furnace tubes and tube reaction. The study includes the following aspects: (1) based regional law, the establishment of a mathematical model of heat transfer between the furnace and the furnace tube. Calculation procedures of the preparation of the direct exchange area. By comparing literature data, verify the reliability of the calculation procedures. (2) coupling method for the numerical simulation of the the KTI-SMK ethane cracker. This method is able to describe the mutual coupling between heat transfer between the hot furnace and the furnace tube and the reaction tube: plug flow, the shrinking shell model as well as regional law describe fluid flow, gas-solid heterogeneous reaction furnace heat transfer of the tube. Industrial production from the field data and simulation results are compared both basic agreement, thus proving the reasonableness of ethane cracking furnace tube charred process created mathematical models and calculation procedures. The simulation detailed temperature coke thickness, heat flux distribution parameters cracking tube, reveal the basic characteristics of the cracking tube heat transfer, mass transfer and reaction processes and their interaction law for ethane cracking furnace charred optimized to provide the basis of the program. (3) the fluid in flowing through the furnace tube bends at the degree of backmixing strengthening, so using the CSTR model described here the flow of fluid, i.e. the PFR and CSTR concatenated reactor model simulation of the scorching process. Constant furnace operating conditions, adjusting the furnace tube the flow and temperature of the inlet gas, the scorching process simulation obtained: ① The inlet temperature is 580 ° C, respectively, 670 ° C for pipe tolerable temperature limit of 1100 ° C under the conditions (4). security charred allow maximum air flow curve. (2) at an inlet temperature at 620 ℃, the highest temperature obtained prediction charred process wall fitting equation, fitting equation is calculated values ??and the calculated values ??of the analog of the charred maximum error of 15 ° C. Constant furnace tube inlet air, water vapor flow charred cracking furnace, the fitting equation optimize their charred procedures to ensure safety charred certain guiding significance. Subsequent waste heat boiler operating characteristics, the proposed design of the basic procedures of the charred, and tune charred program a new method: according to the outlet temperature of the furnace tube to adjust the inlet gas flow rate and inlet temperature to give a non-constant furnace (5). tube inlet gas flow rate, the furnace tube the new charred procedures inlet temperature mode. Simulation results show that: the scorch time of the new program and the current actual scorch time is similar, but the residual carbon content of the tube, the air and water vapor accumulated consumption decreased CO2 volume fraction of the furnace tube outlet and the flow of air and water vapor ratio are within the allowable range of production control, the maximum wall temperature is lower than the limit temperature of the pipe. Keep cracking furnace operating conditions, the optimization of complex optimization method for constant furnace tube inlet gas flow rate and temperature of the charred obtained scorch time shortest optimal operating conditions (6). . Under the operating conditions, the scorch time is significantly shortened, the highest temperature is less than the limit of tolerable temperature of the pipe wall, and the operating range is safe charred. The results of this article, on the improvement of the existing gas feedstock cracking furnace charred program and design development and construction of new and new cracking furnace reasonable charred guiding significance.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic hydrocarbons > Unsaturated lipid hydrocarbon > Monoolefins > Ethylene
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