Intelligent control system gas, MTBE solution
Category:
Smart Factory Integrated Solution
Better Your Technology
Our goal:The yield is increased by 1%-3%, the energy consumption is reduced by 2%-5%, and the fluctuation of key indicators is reduced by more than 30%.
Advanced control technology
Advanced Control Technology (APC) refers to a type of dynamic environment, based on mathematical models, with sufficient computing power, unlike conventional PID control, and has better performance than conventional PID control and achieves better profit for the factory. The general term for the control strategy. It is a new type of control system formed by combining chemical technology, chemical engineering, computer, instrumentation, process control theory and advanced control technology. Complex industrial systems often have the characteristics of long process, many interference factors, large lag, strong coupling and so on. The conventional PID control often has poor performance and even cannot be controlled. Advanced control techniques such as multivariable model predictive control are often better.
Gas, MTBE device advanced control system
Gas fractionation unit mainly liquefied petroleum gas as raw material to produce qualified fine propylene, propane and mixed C4 fractions, provide polymer grade fine propylene for polypropylene device, and provide raw material for downstream MTBE unit. Device has a long process, interference factors, large lagging, strong coupling relationship more complicated process characteristics. Feed rate (production load), feed composition, overhead cold source and bottom heat wave, etc., have brought great difficulty to process control, conventional control can't achieve ideal control effect. Gas points and advanced control system for the three main unit (depropanizer, deethanizer, propylene rectification tower) multivariable model predictive controller design, overcome interference, stable key indicators, at the same time the product components (such as the purity of propylene) & other; Card edge & throughout; Control and reduce the unit energy consumption, increase production of the device.
MTBE (methyl tert-butyl ether) is used in the production of reformulated gasoline of harmonic components, is important for utilizing gasoline additives. Device includes parts, fractionation and post-processing. Reactions under the influence of interference factors such as feed composition, feed temperature, column by column feed and the influence of interference factors such as environmental temperature, reactor hot temperature, column temperature, main control indexes such as volatility device steady rate is poorer, conventional control can't achieve ideal control effect. MTBE advanced control system for MTBE reactor, MTBE azeotropic rectification tower and methanol recovery tower multivariable model predictive controller design, through to interference, stability is accused of indicators, reduce the unit energy consumption, improve the production rate.
Typical Case
Zhejiang Bangye Technology Co., Ltd. and Zhenhai Refining & Chemical Co., Ltd. adopted multivariable model predictive control technology, designed and developed advanced control system for gas fractionation and MTBE equipment. The introduction of advanced control system further improved the automation level of the device and the stability of key process parameters. It stabilizes the product quality, reduces the energy consumption of the device, reduces the labor intensity of the operator, and brings considerable economic benefits to the device.
Fig. 1 is a graph showing the temperature control effect of the top sensitive plate of the deionization tower of the gas separation device. The multi-variable model predictive control technology is introduced, and feedforward control is introduced at the same time to achieve smooth control of the temperature of the sensitive plate, and to ensure the separation index of the target product. By comparing the effects before and after the first control, the standard deviation of the temperature of the sensitive plate decreased by 75.56%.
Figure 2 for gas device product propylene purity control effect. By multivariable model predictive control technology, has realized the steady control of propylene purity, at the same time through & other; Card edge & throughout; Operation, improve equipment production. Contrast, through the effect of before and after the first control putting-in-service proactively control putting-in-service proactively before propylene purity average fell from 99.65% to 99.55% (technical index is 99.5%), the standard deviation has fallen by 89.71%, after statistics propylene yield increased by 2.79%.
Figure 3 is a graph showing the control effect of the hot spot temperature of the reactor of the MTBE device. Hot spot temperature control is a key indicator of reactor control. The smooth control of hot spot temperature ensures good operation of the reaction and reduces interference to subsequent separation devices. By comparing the effects before and after the first control, the standard deviation of the hot spot temperature of the reactor was reduced by 38.24%.
Figure 4 is a graph showing the temperature control effect of the top of the MTBE azeotropic distillation column. The temperature at the top of the column affects the separation efficiency of the components, and the smooth control of the temperature at the top of the column ensures the yield of MTBE. The temperature of the tower top is greatly affected by the ambient temperature. The advanced control system of MTBE adopts the multivariable model predictive control technology and introduces the feedforward variable, which effectively overcomes the interference caused by the ambient temperature and stabilizes the temperature at the top of the tower. By comparing the effects before and after the first control, the standard deviation of the temperature at the top of the tower decreased by 44.45%.
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