Simplifying method for column plate model of large-size air-separation rectification column oriented to adjustment under variable conditions
A technology of model simplification and distillation column, applied in control/regulation system, liquefaction, cold treatment separation, etc., can solve problems such as low model calculation efficiency
Active Publication Date: 2014-09-03
ZHEJIANG UNIV
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[0003] In order to solve the problem of low model calculation efficiency in the adjustment of variable working conditions, the purpose of the present invention is to provide a method for simplifying the plate model of a large air separation distillation column oriented to the regulation of variable working conditions
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[0144] The structural parameters of the upper column of the rectification column used are shown in Table 1.
[0145] Table 1
[0146] Distillation column plate number
132
Expander air inlet location
65
Inlet position of liquid nitrogen from the lower tower
5
The inlet position of the oxygen-enriched liquid air from the lower tower
101
Pollution nitrogen outlet position
10
Argon fraction outlet position
72
Top pressure
12000Pa
Pressure drop per tray
200Pa
[0147] Use the chemical process simulation software Aspen Plus to calculate the temperature on each stage of the tray under full-load open-loop steady-state control, such as figure 2 As shown, calculate the temperature difference ratio f on each stage of the tray i , temperature similarity Φ(i) and temperature similarity deviation Φa(i), as Figure 3-5 shown. According to the temperature difference ratio f i , temperat...
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The invention discloses a simplifying method for a column plate model of a large-size air-separation rectification column oriented to adjustment under variable conditions. The simplifying method comprises the following steps of: calculating a temperature similarity and a temperature similarity deviation of all-level column plates at the moment of full-load open-loop homeostatic control; segmenting the column plates according to a column plate model segmenting standard; selecting a sensitive column plate in each segmented column plate model; calculating a liquid holdup factor and correcting a calculated value of the liquid holdup of the sensitive column plate; causing the change in liquid holdup on all-level column plates in each segmented column plate model to be equivalent to the change in liquid holdup on a first-level sensitive column plate, establishing a segmented simplified column plate model of the rectification column, and then calculating an outlet parameter of the rectification column; and transferring the outlet parameter of the rectification column to a peripheral controller, thereby performing adjustment under variable conditions. The simplifying method has the characteristics that the calculation precision for parameter values, such as concentration of each outlet component of the rectification column during the adjustment under variable conditions is ensured and the efficiency of the adjustment under variable conditions is increased.
Description
technical field [0001] The invention relates to a method for constructing a tray model of a rectification column, in particular to a method for simplifying a tray model of a large-scale air separation rectification column oriented to variable working conditions. Background technique [0002] Distillation tower is a key part of large air separation equipment. The variable coupling relationship in the distillation column tray model is complex, and the calculation time of the model is long in the variable working condition adjustment. In order to reduce the complexity of the distillation column model and improve the calculation efficiency, a series of methods have been proposed. For example, Dalaouti.N proposed the configuration method in the paper "A unified modeling framework for the optimal design and dynamic simulation of staged reactive separation processes" in "Computers and Chemical Engineering" (30(8):1264-1277) in 2006 (collocation method), through the introduction of...
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IPC IPC(8): G05B13/02
CPCF25J2290/10F25J3/04848
Inventor 刘振宇彭翔谭建荣
Owner ZHEJIANG UNIV