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Medium-speed coal mill model building method based on system dynamics

A system dynamics and construction method technology, applied in the field of medium-speed coal mill modeling, can solve the problems of reducing the practicality and applicability of the model, and the quality of the model cannot be guaranteed

Inactive Publication Date: 2017-05-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Application Information

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Problems solved by technology

This modeling method not only cannot guarantee the quality of the model, but also reduces the practicability and applicability of the model to a certain extent

Method used

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  • Medium-speed coal mill model building method based on system dynamics
  • Medium-speed coal mill model building method based on system dynamics
  • Medium-speed coal mill model building method based on system dynamics

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Embodiment Construction

[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0036] Please refer to figure 1 , the present invention includes a coal mill output subsystem and a pulverized coal outlet temperature subsystem of the coal mill. The coal mill output subsystem is used to study the influence of coal supply and coal quality on the coal mill output. The coal pulverized coal outlet temperature subsystem of the coal mill is used to study the influence of coal supply, coal quality and primary air on the pulverized coal outlet temperature of the coal mill.

[0037] Please refer to figure 2 , the working process of the present invention is as follows:

[0038] 1. Determine the main variables of the model

[0039] The variables in the model are stock variables, flow variables and auxiliary variables. In order to simplify the model parameters, those parameters that do not change significantly with time are also approximately tak...

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Abstract

The invention provides a medium-speed coal mill model building method based on system dynamics. According to the method, two subsystems are arranged in a medium-speed coal mill model and include the coal mill power output subsystem and the coal mill pulverized coal outlet temperature subsystem, wherein the coal feed quantity of a coal feeder is input into the coal mill power output subsystem, and the coal mill power output subsystem outputs power to a coal mill; primary parameters, output power of the coal mill and the coal feed quantity of the coal feeder are input into the coal mill pulverized coal outlet temperature subsystem, and the coal mill pulverized coal outlet temperature subsystem outputs heat of wind-powder mixtures at an outlet of the coal mill. According to the method, the medium-speed coal mill is modeled from the balanced angle of matter and energy according to the system dynamics principle. By means of the method, a simple, practical, reasonable and reliable model can be provided for analysis and control over the medium-speed coal mill, so that guarantees are provided for safe, stable and economical operation of power station boilers.

Description

technical field [0001] The invention relates to a method for modeling a medium-speed coal mill from the perspective of material and energy balance, and belongs to the technical field of power generation. Background technique [0002] The rapid development of the economy has promoted the rapid development of electric power. my country's energy structure, which is rich in coal, poor in oil, and low in gas, as well as hydropower stations limited by natural conditions, determines that coal is still the main energy that my country relies on. With the rapid development of the domestic power industry, the application range of medium-speed coal mills has been expanding and has become the main pulverizing equipment in thermal power plants. Its operating conditions have a direct impact on the stability and economy of power plant boilers. The medium-speed coal pulverizer is an object with large delay and large inertia. The reasonable control of its thermal process is the main technical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C25/00G06F17/50
CPCB02C25/00G06F30/20G06F2119/06G06F2119/08Y02E60/00
Inventor 魏乐苑召雄秦腾腾
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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