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Dynamic model solution method for one-dimensional plug flow reactor

A technology of plug flow reactor and dynamic model, which can be used in instruments, CAD numerical modeling, special data processing applications, etc., and can solve problems such as error in solution results

Inactive Publication Date: 2018-08-24
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, since the gas volume flow rate Q in the actual process will change with the temperature, the molar flow rate of the gas, temperature and other parameters, the result of this solution will inevitably produce certain errors

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  • Dynamic model solution method for one-dimensional plug flow reactor
  • Dynamic model solution method for one-dimensional plug flow reactor
  • Dynamic model solution method for one-dimensional plug flow reactor

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Embodiment Construction

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0042] see figure 1 As shown, a method for solving the dynamic model of a one-dimensional plug flow reactor that is applicable to a gas feedstock of the present invention includes:

[0043] Step 10, see figure 2 As shown, according to the size of the reactor and the calculation time, the solution domain is equally divided, the space axis is divided into n equal parts, and the time axis is divided into N equal parts; where figure 2 (a) is the overall segmentation diagram that equally divides the solution domain, figure 2 (b) is the segmentation map at point (j,k);

[0044] Step 20, assigning initial conditions and boundary conditions to coordinate points corresponding to the abscissa and ordinate on the solution domain;

[0045] Step 30, using the finite difference method to convert the original model equation into an algebraic equation ...

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Abstract

The present invention relates to a dynamic model solution method for a one-dimensional plug flow reactor with the feedstock of gas. The method comprises: starting from a mechanism model of a plug flowreactor (ideal tubular reactor), discretizing partial differential equations for describing the dynamics model into algebraic equations by using a finite difference method; converting the concentration in the model equation into a function of the temperature and gas molar flow by using a gas state equation; and by using simultaneous equations, solving to obtain distribution of the temperature andcomposition of the plug flow reactor with the space and time. The method disclosed by the present invention can be used for the calculation method for the ideal tubular reactor with the feedstock component of the gas phase, and the assumption that the gas volume flow must be set to a constant parameter in the previous solution process is overcome, so that the dynamic model solution result of thereactor is more accurate.

Description

technical field [0001] The invention relates to the technical field of reactor models, in particular to a method for solving a dynamic model of a one-dimensional plug-flow reactor whose feed is gas. Background technique [0002] According to whether variables are related to time, mathematical models can be divided into steady-state simulation and dynamic simulation. Steady-state simulation does not consider the transient changes of the process, so it cannot describe the characteristics of equipment start-up and shutdown and abnormal working conditions; while dynamic simulation can better reflect the dynamic characteristics of the chemical process, and can describe the actual chemical process in an objective and detailed manner. [0003] The dynamic model needs to consider the influence of the time item, so that the dynamic mathematical model of the plug flow reactor is described by partial differential equations. In addition, gaseous materials widely exist in chemical react...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F17/13
CPCG06F17/13G06F30/23G06F2111/10G06F2119/08
Inventor 王雁冰周华曹志凯江青茵
Owner XIAMEN UNIV
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