Rapid energy-saving prediction control method for overheat steam temperature

A technology of superheated steam temperature and predictive control, which is applied in the direction of temperature control using electric mode, auxiliary controller with auxiliary heating device, adaptive control, etc., which can solve the problems of lack, complex algorithm and large amount of calculation.

Active Publication Date: 2014-12-03
NANJING GUITU TECH DEV
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Problems solved by technology

[0005] Purpose of the invention: In view of the above problems, a fast energy-saving predictive control method for superheated steam temperature is proposed to solve the shortcomings of traditional predictive control methods, such as complex algorithm, large amount of calculation and lack of effective control parameters to effectively adjust the system control performance, which is difficult to realize in engineering

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  • Rapid energy-saving prediction control method for overheat steam temperature
  • Rapid energy-saving prediction control method for overheat steam temperature
  • Rapid energy-saving prediction control method for overheat steam temperature

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Embodiment Construction

[0026] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0027] Step 1: Obtain the step response model of the superheated steam temperature object. Under steady-state conditions, conduct an open-loop step response test of the opening of the desuperheating spray valve to obtain system response data, and use the step response model identification method. The transfer function model of desuperheating water injection valve opening (% / ℃)-superheated steam temperature is identified as follows:

[0028] G T ( s ) = - 7.961 ( 19 s + 1 ) 2 ( ...

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Abstract

The invention discloses a rapid energy-saving prediction control method for an overheat steam temperature. The method obtains a prediction control model of a controlled object through step testing of an overheat steam temperature object. An overheat stream temperature control system records a temperature reduction water spraying valve opening degree control quantity sequence and an overheat steam temperature measurement value sequence in an online and real-time manner. According to novel performance indexes proposed in the method, the control system obtains the of a current temperature reduction water spraying valve opening degree through simple calculation. The control method solves problems, which exist in traditional limited prediction control, that optimization problems are complex, calculation quantity is large and effective control parameters for adjustment of the control performance of a system are lacked so that overheat steam temperature control is stable and rapid and a process dynamic deviation is small and no stable deviation exists. The method is capable of ensuring control quality and at the same time, also capable of reducing a temperature reduction water spraying quantity in a control process and thus economy of unit operation is improved.

Description

technical field [0001] The invention belongs to the technical field of thermal automatic control, and in particular relates to a superheated steam temperature rapid energy-saving prediction control method. Background technique [0002] The superheated steam temperature is an important parameter in the thermodynamic system of a thermal power plant. The quality of the superheated steam temperature control directly affects the safe and economical operation of the entire unit. The superheated steam temperature control system is one of the important control systems of the unit. Since the superheated steam temperature object is a thermal object with a large lag and a large delay, and with the increase of the capacity of the unit, this characteristic will be more significant. The traditional PID control algorithm is often difficult to meet the fast and stable control requirements, which affects the safe and economical operation of the unit. Therefore, it is of great significance t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/32G05B13/04
Inventor 雎刚陈欢乐陈雪峰
Owner NANJING GUITU TECH DEV
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