Combination control method for exit temperature of heating furnace

A technology of comprehensive control of outlet temperature, applied in temperature control without auxiliary power supply, controller with specific characteristics, adaptive control, etc., can solve problems such as device disturbance

Active Publication Date: 2008-09-03
TSINGHUA UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

The implementation of advanced control based on the input-output model generally requires a step test to cause disturbances to the device

Method used

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  • Combination control method for exit temperature of heating furnace
  • Combination control method for exit temperature of heating furnace
  • Combination control method for exit temperature of heating furnace

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Experimental program
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Embodiment Construction

[0084] The method of the present invention contains the following two parts: the outlet temperature self-adaptive state feedback predictive control and branch balance control. The principle block diagram and overall structure diagram of the realization method are shown in the appended figure 1 And attached figure 2 .

[0085] The outlet temperature adaptive state feedback predictive control part includes the following steps:

[0086] Step A1: Establish a simplified mechanism model with the outlet temperature of the heating furnace, the furnace chamber temperature and the fuel flow (pressure) as state variables; this step is carried out in turn according to the following sub-steps:

[0087] Step A1.1: Assumption: (1) When the thermal efficiency of the heating furnace does not change much, the proportion of the effective heat absorbed by the fluid in the furnace tube to the total calorific value of combustion remains unchanged, and the heat loss of the flue gas is ignored in t...

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Abstract

The invention relates to a comprehensive control method for the outlet temperatures of a heating furnace, belonging to the field of furnace temperature control technology. The invention is characterized in that branch balance control makes the outlets temperatures of a multi-branch heating furnace uniform, and automatic load lifting and dropping can be realized. By using state feedback prediction control of measured states and feedforward control, the method effectively improves the anti-interference ability. A state space model of the heating furnace is obtained by mechanism modeling, in no need of testing devices. An on-line model is self-adaptive, which effectively overcomes process characteristic change and improves the rate of putting into operation. Low-value fuel can realize idea valve location interval control, thus saving high-value fuel. The comprehensive control of the outlet temperatures ensures the uniform and stable outlet temperatures of the heating furnace, which is easy to operate and economical.

Description

technical field [0001] The invention relates to an automatic control method for a tubular heating furnace, and belongs to the field of automatic control of tubular heating furnaces and production processes in petrochemical industry. Background technique [0002] Tubular heating furnaces (hereinafter referred to as heating furnaces) play a very important role in oil refining and petrochemical production. Almost every set of oil refining and petrochemical equipment has tubular heating furnaces, such as atmospheric and vacuum heating furnaces and delayed coking heating furnaces. , reforming furnace, etc. Realizing the stable control of the outlet temperature of the heating furnace, keeping it at the value required by the process can ensure the separation effect or reaction depth, which has a direct impact on ensuring product quality and realizing "long-term safe and stable operation". [0003] For a large heating furnace, due to the large amount of heated medium, it is usually...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/10G05B11/42G05B13/04F24H9/20
Inventor 黄德先张伟勇吕文祥金以慧
Owner TSINGHUA UNIV
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