A Coordination and Limit Control Method of Interactive Response Between Variables of Heating Furnace
A technology of interactive response and control method, which is applied to furnace control devices, lighting and heating equipment, furnaces, etc., can solve the problems of unstable operation of heating furnaces, coupling of feeds of branch furnace tubes, and difficulty in realizing interactive optimization control. Achieve safe and long-term stable operation and solve the effect of large temperature difference in branch circuits
Active Publication Date: 2019-06-18
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 realize the interactive optimal control of the variables
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[0028] Such as figure 2 As shown, the control scheme of the heating furnace is optimized. The new control scheme introduces the combustion system and the branch temperature balance system. The combustion system is the basis for the operation of the branch balance and coordinated control system. The temperature balance of the branch circuit works, and the priority of the combustion system is higher than that of the branch circuit temperature balance system. details as follows:
[0029] (1) Increase the branch balance control, according to the temperature difference of the four outlets TI0403A, TI0403B, TI0403C, TI0403D, introduce feedforward control, and fine-tune the maximum temperature feed amount and the minimum temperature feed amount in advance, which is conducive to the stability of the outlet temperature of the heating furnace , and reduce the "bias flow" phenomenon of the four branch flow valves.
[0030] (2) Add a temperature compensation module, which can be put in...
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The invention discloses a heating furnace variable alternate acknowledge overall planning and limit control method and belongs to the technical field of industrial control. A heating furnace control system achieving the method is composed of a combustion system, a branch temperature balancing system and a temperature intelligent compensation system. In each control period, the monitoring index ofeach subsystem is automatically detected, the subsystems operate when Fi is 1, and the subsystems are stopped when Fi is 0. When the branch temperature balancing system operates, the branch feeding amount is adjusted in a limited mode, and the limit control technology is provided. The alternate acknowledge mechanism of each subsystem of a heating furnace is built, coordinate control of each variable of the heating furnace is overall planned, and safety long-term stable operation of the heating furnace is achieved. Four branch flow rates of the heating furnace are not controlled in a definite-value mode but as an auxiliary loop of liquid level control, and the branch balance control implementation difficulty is large. The branch temperature balancing system is introduced to solve the problems that the branch temperature difference among four branch furnace pipes is large, and the opening degrees of branch feeding flow valves are not consistent.
Description
technical field [0001] The invention relates to a multi-variable interactive response coordinating and limiting control method of a heating furnace device, which belongs to the technical field of industrial control. Background technique [0002] The heating furnace is an important device in industrial production. Its task is to heat the raw material to a certain temperature to ensure the smooth progress of the next process. Therefore, the temperature control of the heating furnace plays a pivotal role. There are many interference factors affecting the outlet temperature of the heating furnace, and the dynamic response of the furnace is generally slow, so the cascade and feedforward control schemes are mostly selected for the temperature control system of the heating furnace. [0003] With the enlargement of refinery equipment and heating furnaces, in order to reduce the pressure drop of the furnace tubes and save energy, and to make the raw materials heated evenly, the heati...
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IPC IPC(8): F27D19/00
CPCF27D19/00F27D2019/0087
Inventor 王文新李全善焦阳
Owner BEIJING CENTURY ROBUST TECH