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Control system and control method for outlet temperature of novel coal mill

A technology of outlet temperature and control system, which is applied in combustion methods, block/powder fuel preparation, grain processing, etc., can solve the problem of inability to adapt to frequent changes of coal mills and the operating value of coal mill outlet temperature is low, and achieves The effect of reducing the heat loss of pulverized coal incomplete combustion, stabilizing boiler combustion, and reducing the heat loss of incomplete combustion

Active Publication Date: 2015-07-29
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: The purpose of the present invention is to adopt a new control method for the outlet temperature of the coal mill to realize that the upper limit of the outlet temperature of the coal mill can be dynamically controlled according to the change of the coal quality, and to ensure the safe operation of the coal mill. In order to maximize the temperature at the outlet of the coal mill, improve the operation economy of the coal mill, improve the level of operation automation, and improve the operation economy of the related systems of the coal mill, solve the coal grinding problem existing in the current control method of the coal mill outlet temperature. The upper limit of the outlet temperature of the coal mill is only set for a specific type of coal, which cannot adapt to the frequent changes in the quality of the coal fed to the coal mill and the low operating value of the outlet temperature of the coal mill

Method used

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  • Control system and control method for outlet temperature of novel coal mill
  • Control system and control method for outlet temperature of novel coal mill
  • Control system and control method for outlet temperature of novel coal mill

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Experimental program
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Effect test

Embodiment 1

[0041] The structure of the control system of this embodiment is as follows: figure 1 As shown, the algorithm flow chart is as follows Figure 4 As shown, the details are as follows:

[0042] 1) The carbon monoxide concentration measurement signal at the coal mill outlet is connected to the coal mill outlet temperature control system as a parameter for controlling the coal mill outlet temperature;

[0043] 2) If the carbon monoxide concentration measuring point at the coal mill outlet measures the average carbon monoxide concentration at the coal mill outlet to be 0PPm, the controller issues an instruction to increase the opening of the hot air control door at the coal mill inlet and decrease the opening of the cold air control door at the coal mill inlet. When the carbon monoxide concentration measuring point at the outlet of the coal mill measures the concentration of carbon monoxide at the outlet of the coal mill is greater than 0PPm, immediately lock the opening of the ho...

Embodiment 2

[0048] The structure of the control system of this embodiment is as follows: figure 2 As shown, the algorithm flow chart is as follows Figure 5 As shown, the details are as follows:

[0049] 1) The relative humidity measurement signal of the air-powder mixture at the outlet of the coal mill is connected to the temperature control system at the outlet of the coal mill as a parameter for controlling the outlet temperature of the coal mill;

[0050] 2) If the relative humidity of the air-powder mixture at the outlet of the coal mill is greater than 0.52 measured at the relative humidity of the air-powder mixture at the outlet of the coal mill, the controller issues an instruction to increase the opening of the hot air door at the inlet of the coal mill and reduce the opening of the cold air door opening until the relative humidity of the air-powder mixture at the outlet of the coal mill is 0.52;

[0051] 3) If the relative humidity of the air-powder mixture at the outlet of t...

Embodiment 3

[0056] The structure of the control system of this embodiment is as follows: image 3 As shown, the algorithm flow chart is as follows Figure 6 As shown, the details are as follows:

[0057] 1) The carbon monoxide concentration measurement signal at the coal mill outlet and the relative humidity measurement signal of the air-powder mixture at the coal mill outlet are connected to the coal mill outlet temperature control system as parameters for controlling the coal mill outlet temperature;

[0058] 2) If the carbon monoxide concentration measuring point at the coal mill outlet measures the carbon monoxide concentration at the coal mill outlet as 0PPm, and the relative humidity of the air-powder mixture at the coal mill outlet is greater than 0.52, increase the opening of the hot air control door at the coal mill inlet and reduce the Adjust the opening of the cold air door at the coal machine inlet until the relative humidity at the coal mill outlet is 0.52 or the carbon mono...

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Abstract

The invention discloses a control system and control method for outlet temperature of a novel coal mill. The control system comprises a controller, a coal mill outlet temperature detector and a coal mill hot air damper, wherein the coal mill outlet temperature detector is mutually connected with the controller; the controller is connected to the coal mill hot air damper. Compared with an existing control method, the control method disclosed by the invention can overcome the defects existing in an existing coal mill outlet temperature control method that a coal mill outlet temperature upper limit value is only set aiming at specific coal, the frequent change of the quality of coal supplied by the coal mill cannot be adapted, and a coal mill outlet temperature running value is low. According to the control system and the control method disclosed by the invention, the automatic level of coal mill operation can be improved, the outlet temperature of the coal mill is effectively improved, the power consumption generated during coal milling of the coal mill is reduced, and the carbon content of a product after pulverized coal combustion can be reduced.

Description

technical field [0001] The invention relates to a novel coal mill outlet temperature control system and its control method, aimed at coal mills that use coal as raw material for generating sets and other industrial production processes that grind coal blocks into coal powder, and belong to coal mills The technical field of energy saving and automatic control. Background technique [0002] For power generation units and other industrial production processes that use coal as raw material, the control of the outlet temperature of the coal mill has an important impact on the operating efficiency of the boiler and the economical operation of related equipment. Tests have shown that if the outlet temperature of the coal mill of a 300MW coal-fired generating set is increased by 20°C, the boiler efficiency of the unit can be increased by more than 0.3%, and the power consumption of the coal mill for pulverized coal is significantly reduced. At present, the outlet temperature of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C25/00F23K1/00
Inventor 门冉盛昌栋李晓东
Owner SOUTHEAST UNIV
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