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Intelligent control method and module of steel ball coal mill wind system

A steel ball pulverizer and intelligent control technology, applied in grain processing and other directions, can solve the problems of increased power consumption and decreased output of coal pulverizers, and achieve the effects of reducing power consumption, reducing operating frequency, and improving drying output and ventilation output.

Active Publication Date: 2018-10-23
哈尔滨中远控制工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this has caused a decrease in the output of the coal mill and an increase in power consumption

Method used

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  • Intelligent control method and module of steel ball coal mill wind system
  • Intelligent control method and module of steel ball coal mill wind system
  • Intelligent control method and module of steel ball coal mill wind system

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0025] Specific implementation mode one: combine figure 1 To illustrate this embodiment, the intelligent control method for the air system of a steel ball coal mill described in this embodiment includes the following steps:

[0026] Sampling steps: collect the inlet pressure value and outlet temperature value of the steel ball coal mill;

[0027] Control mode judgment step: when the inlet pressure reaches the high pressure threshold or the outlet temperature reaches the high temperature threshold, execute the transient control step; otherwise, execute the steady state control step;

[0028] The transient control step is: using a PID controller to control the hot air door and the warm air door, and then returning to perform the sampling step;

[0029] Steady-state control step: use fuzzy control method to control the hot air door, warm air door, recirculation door and cold air door, and then return to the sampling step.

[0030] In this embodiment, a PID controller is used to...

specific Embodiment approach 2

[0041] Specific implementation mode two: combination figure 2 Describe this embodiment. This embodiment is a further limitation of the intelligent control method for the air system of the steel ball coal mill described in Embodiment 1. In this embodiment, the transient control steps are specifically:

[0042] When the outlet temperature reaches the high temperature threshold, the hot air door opening output value AO_rfm=AO_rfm_1+du_rfm+Δrfm, the hot air door is controlled according to the hot air door opening output value AO_rfm, and Tzt control cycles are continuously executed;

[0043] When the inlet pressure reaches the high pressure threshold, the temperature air door opening output value AO_wfm=AO_wfm_1+du_wfm+Δwfm, the temperature air door is controlled according to the temperature air door opening output value AO_wfm, and Tzt control cycles are continuously executed;

[0044] Among them, AO_rfm_1 and AO_wfm-1 are the opening control output values ​​of the hot air door ...

specific Embodiment approach 3

[0049] Specific implementation mode three: combination figure 2 Describe this embodiment. This embodiment is a further limitation of the intelligent control method for the steel ball coal mill air system described in Embodiment 2. In the transient control step, if the outlet temperature reaches the high temperature threshold, then Tzt=Tzt1; otherwise, Tzt=Tzt2; Tzt1>Tzt2.

[0050] Usually one control cycle is 1 second, Tzt1=200, Tzt2=400 can be taken. Then, when the inlet pressure reaches the high pressure threshold but the outlet temperature does not reach the high temperature threshold, the hot air door is controlled according to the hot air door opening output value AO_rfm, and 200 control cycles are continuously executed. When the outlet temperature reaches the high temperature threshold, the warm air door is controlled according to the output value AO_wfm of the warm air door opening, and 400 control cycles are continuously executed.

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Abstract

The invention discloses an intelligent control method of a steel ball coal mill wind system and a module, relates to a control technology of the steel ball coal mill wind system, and aims to satisfy the development demands of the steel ball coal mill. An inlet pressure value and an outlet temperature value of a steel ball coal mill are firstly acquired; when the inlet pressure reaches a high-pressure threshold or the outlet temperature reaches a high-temperature threshold, a PID control technology is used for transient state control; and otherwise, a fuzzy control technology is used for stable state control. The method adopts a transient state and stable state separated control technology, guarantees quick response at dangerous time, realizes stable adjustment under stable conditions, reduces the action frequency of a wind door, and prolongs the service life of the wind door. As the intelligent control scheme is adopted in the stable state, the drying power and the ventilation power of the coal mill are obviously improved, and the power consumption of the coal mill is reduced. The method is suitable for the steel ball coal mill.

Description

technical field [0001] The invention relates to the control technology of the air system of a steel ball coal mill. Background technique [0002] The steel ball coal mill (hereinafter referred to as the coal mill) is an important auxiliary equipment of the medium storage pulverized coal boiler, which is used to grind the raw coal into a certain fineness of pulverized coal and store it in the pulverized coal bunker. When the coal mill is running, the grinding cylinder rotates, and the steel balls in the grinding cylinder are brought to a certain height by the inner wall and then fall by their own gravity, hitting the coal stored in the cylinder, and the stored coal is crushed into coal powder, and the coal powder is blown by the wind from the mill. The coal is separated from the coal machine, and after being separated by the coarse powder separator, fine powder separator and cyclone separator, it falls into the pulverized coal bin for storage. Therefore, the air system of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C23/20B02C23/04B02C25/00
CPCB02C23/04B02C23/20B02C25/00
Inventor 柴庆宣
Owner 哈尔滨中远控制工程有限公司