Heating furnace variable alternate acknowledge overall planning and limit control method

Abstract

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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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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