Primary steam temperature adjusting method and adjusting system

A technology of main steam temperature and adjustment method, applied in electric controllers, controllers with specific characteristics, etc., can solve problems such as strong case-specificity, control disorder, and temperature rise below the set value, and achieve excellent adjustment quality , Improve the adjustment quality and maintain the effect of adjustment quality

Pending Publication Date: 2017-08-01
NORTHWEST BRANCH OF CHINA DATANG CORP SCI & TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, although there are many advanced control technologies for main steam temperature, such as prediction technology, fuzzy technology, neural network technology, etc., the above-mentioned technologies are more theoretical, with many academic articles, mainly simulation verification, and poor engineering field applicability. Although there are on-site application examples, they are highly specific to individual cases and poor in popularization and promotion, which is not conducive to on-site commissioning of projects
[0006] After in-depth research on the principle of main steam temperature control, it was found that the root of the problem was that the temperature behind the secondary desuperheater was increased or decreased due to the increase or decrease of the water spray volume, which caused the temperature to change drastically, resulting in control disorder. PID control parameters to improve the quality of the main steam temperat

Method used

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  • Primary steam temperature adjusting method and adjusting system
  • Primary steam temperature adjusting method and adjusting system
  • Primary steam temperature adjusting method and adjusting system

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0061] Example 1.

[0062] The main steam temperature adjustment system of the present invention, the subtractor SUM1, calculates the difference between the main steam temperature measurement value and the set temperature of the main PID controller;

[0063] The first temperature selection unit includes a number of temperature modules, which respectively set different temperature limits. The output value of the subtractor SUM1 module selects its corresponding temperature module output in the temperature selection unit;

[0064] Low temperature control logic module, the output value of the temperature selection unit is output after calculation by the low temperature control logic module;

[0065] High temperature control logic module, the output value of the temperature selection unit is output after calculation by the low temperature control logic module;

[0066] High temperature comparison module, which compares the output value of the secondary desuperheater with the output value of ...

Example Embodiment

[0086] Example 2

[0087] In this embodiment, on the basis of the first embodiment, the main steam temperature measurement value is adjusted by the slope feedforward control system. A slope feedforward control system is provided between the output and input of the secondary PID controller, which includes

[0088] The main steam lagging temperature module sets a main steam lagging temperature value according to the measured value of the main steam temperature;

[0089] The subtractor SUM2 module calculates the difference between the main steam temperature measurement value and the main steam lag temperature;

[0090] Upper and lower limit selection module, set a number of temperature limits, the subtractor SUM2 module is selected by the upper and lower limit selection module to output according to different limits;

[0091] The second temperature selection unit includes a number of temperature modules, each of which sets a number of temperature values, and outputs the difference value of...

Example Embodiment

[0105] Example 3

[0106] The non-linearity of the desuperheating water regulating valve is also one of the important reasons that affect the quality of the main steam temperature control, and this feature is prominent in the case of the desuperheating water valve at a small opening, the valve opening changes by 3% at a small opening. The difference in the desuperheating water flow caused by the same opening with large opening changes is several times or more. If the characteristics of this common desuperheating water valve are not corrected in time, the adjustment quality of the main steam temperature system will be greatly compromised, causing the valve to open. When the degree is large, the adjustment speed is too slow; when the valve opening degree is small, the adjustment speed is too fast. In addition, frequent valve movements will also cause serious wear to the valve core and actuator, which greatly increases the maintenance workload. Therefore, to improve the quality of ...

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Abstract

The invention relates to a thermal power station primary steam temperature control system and control method thereof. The system according to the method comprises a primary PID controller and a secondary PID controller. The method is characterized by comprising the following steps that (1) a preset value is inputted to the primary PID controller; and (2) a primary steam temperature measured value is compared with the primary PID controller preset value, and the secondary PID controller takes the output value of the primary PID controller as the preset value when the deviation is within the range of the set value. According to the primary steam temperature adjusting method, the preset value of the primary PID controller is set, and segmented control and adjustment are performed on the difference value of the primary steam temperature measured value and the primary PID controller preset value so that the quality of primary steam temperature control and adjustment can be greatly enhanced, the whole process of primary steam temperature automatic adjustment under the unvarying condition can be truly realized, and the excellent adjustment quality can be maintained in the automatic adjustment process.

Description

technical field [0001] The invention relates to a thermal power station main steam temperature control system and a control method thereof. Background technique [0002] The main steam temperature is one of the main control parameters of the thermal power unit, and its control effect directly affects the safe and economical operation capability of the unit. At present, the main steam temperature control system of thermal power units generally adopts the traditional PID cascade control. Although this control scheme is easy to debug on site, it cannot adapt to the characteristics of variable parameters, large inertia, and large time delay of the main steam temperature control system, which leads to the main The steam temperature automatic control system generally has a good automatic control quality when the load is stable, but in the process of load changes, start / stop coal mills, etc., the main steam temperature fluctuates greatly, and even the automatic cannot be put into o...

Claims

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Application Information

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IPC IPC(8): G05B11/42
CPCG05B11/42Y02P90/02
Inventor 刘永红李云郝臻赵宇邹包产陈鹏原周昕
Owner NORTHWEST BRANCH OF CHINA DATANG CORP SCI & TECH RES INST
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