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A New Coal Pulverizer Outlet Temperature Control System and Its Control Method

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 the incomplete combustion of pulverized coal, stabilizing the combustion of the boiler and improving the efficiency of the boiler

Active Publication Date: 2017-11-28
SOUTHEAST UNIV
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  • Summary
  • 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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  • A New Coal Pulverizer Outlet Temperature Control System and Its Control Method
  • A New Coal Pulverizer Outlet Temperature Control System and Its Control Method
  • A New Coal Pulverizer Outlet Temperature Control System and Its Control Method

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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 hot...

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 th...

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 Image 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 monoxi...

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Abstract

The invention discloses a novel coal mill outlet temperature control system and its control method, wherein the control system includes a controller, a coal mill outlet temperature detector, a coal mill hot air regulating door, and the coal mill outlet temperature detector is located at the The controllers are connected to each other, and the controllers are connected to the hot air regulating door of the coal mill. Compared with the current control method, the control method involved in the present invention can solve the problem that the upper limit of the coal pulverizer outlet temperature in the current coal pulverizer outlet temperature control method is only set for a specific coal type and cannot be adapted to coal pulverizers. The quality of coal fed to the mill frequently changes and the operating value of the outlet temperature of the coal mill is low. It can improve the automation level of the operation of the coal mill, effectively increase the outlet temperature of the coal mill, reduce the coal grinding power consumption of the coal mill, and reduce the carbon content in the pulverized coal combustion product.

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 Patents(China)
IPC IPC(8): B02C25/00F23K1/00
Inventor 门冉盛昌栋李晓东
Owner SOUTHEAST UNIV
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