A Multivariable Intelligent Coordinated Control Method for Cracking Furnace
A technology of coordinated control and cracking furnace, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of difficult optimal control of each variable, poor effect, unstable operation of heating furnace, etc., and achieve balanced control. problems, ensure no deviation, and achieve the effect of safe and long-term stable operation
Active Publication Date: 2020-12-01
BEIJING CENTURY ROBUST TECH
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Problems solved by technology
This technical feature mainly solves the problem of severe coupling and poor effect of the feeding of furnace tubes in each branch when the conventional branch temperature equalization control method is implemented, and the long-term unstable operation of the heating furnace caused by manual control when the total load of the heating furnace changes. question
The main feature of this technology is to set multiple groups of distributed control structures, and the control structures collect discrete information. However, in the face of multi-variable and coupled systems, if the control structure is used to collect discrete information, it will be parallel. , it is difficult to achieve optimal control of each variable
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[0043] Taking the EF-101 cracking furnace of a petrochemical ethylene plant as an example, the cracking furnace has 2 furnaces, 4 channels of hydrocarbon feed, and 4 branch flow controllers are FIC101102, FIC101202, FIC101302, FIC101402, and each feed is equipped with one Dilution steam and 2nd dilution steam, 1st dilution steam flow rate is FFIC101112, FFIC101212, FFIC101312, FFIC101412 respectively, 2nd dilution steam flow rate is FFIC101113, FFIC101213, FFIC101313, FFIC101413 respectively. 4 branch temperature are TDC101102, TDC101202, TDC101302 For TDC101402, the COT temperatures of A and B furnaces are TIC101327 and TIC101427 respectively.
[0044] (1) if figure 2 As shown, A furnace COT temperature TIC101327 and fuel gas flow rate FIC101011 cascade control, add calorific value control QIC101001A, introduce fuel gas low pressure protection controller PIC101011A and high pressure protection controller PIC101011B, for soft chain safety protection; B furnace COT temperature...
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The present invention discloses a cracking furnace multivariable intelligent coordination control method, belonging to the technical field of industrial intelligent control. The method is achieved based on four control subsystems consisting of a combustion system, a branch temperature balance system, a dilution ratio system and a load regulation system. The method perform priority division according to importance of a plurality of control variables such as a COT temperature, feeding and diluted steam of a cracking furnace COT. In an operation process, all the variables are confirmed in real time, all the variables are normally regulated in an allowed range, and if the variables exceed the range, step-by-step regulation is performed according to the priority to avoid generation of new coupling. When the branch COT deviation exceeds the range, the branch feeding is regulated in a limitation mode, the diluted steam is synchronously regulated, and a total load is not changed, so that the balance control problem is solved, and it is ensured that the branch COT has no deviation. Based on the heat balance theory, calorific value control and load control are introduced into the method to improve the fuel gas components and a lag problem when the load is changed so as to finally achieve stable operation of the cracking furnace.
Description
technical field [0001] The invention relates to a multivariable intelligent coordinated control method for a cracking furnace in an ethylene plant, belonging to the technical field of industrial intelligent control. Background technique [0002] The cracking furnace is the core equipment of the ethylene plant and is also the main energy-consuming equipment of the ethylene plant. Its energy consumption accounts for about 80% of the total energy consumption of the plant. The cracking furnace is used to crack hydrocarbons at high temperature to produce cracked gas, which is produced through quenching, compression and separation. Products such as ethylene and propylene basically determine the product yield and main energy consumption indicators of the entire ethylene plant, so the operating level and technical level of the cracking furnace directly affect the economic benefits of the entire ethylene plant. The cracking furnace is a complex multivariable control system. The main ...
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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 王文新李全善焦阳
Owner BEIJING CENTURY ROBUST TECH