JPH04244246A - Roller mill apparatus - Google Patents

Abstract

PURPOSE:To provide a roller mill apparatus reduced in the fluctuation of outlet temp. generated when the supply amount of an object to be ground to a roller mill is changed. CONSTITUTION:In a roller mill equipped with the table 11 rotating around a vertical drive shaft and a plurality of the rollers 12 tumbling on the table 11 to ground the object to be ground on the table 11, mechanisms 6, 7 controlling the amount and temp. of the air supplied to the roller mill, a mechanism 9 detecting the air inlet temp. of the roller mill and a mechanism 10 detecting the air temp. of the product outlet of the roller mill are provided and air inlet temp. is controlled corresponding to the supply amount of the object to be ground to keep the air temp. of the product outlet constant.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to clinker, pulverization or
The present invention relates to a roller mill used for grinding blast furnace slag, etc., and particularly to its temperature control system.

0002

2. Description of the Related Art Conventionally, as shown in FIG. 5, the outlet temperature of a roller mill is measured to control the inlet temperature.

0003

[Problems to be Solved by the Invention] For example, coal contains about 10% water, and it is desirable to improve the pulverization efficiency in a roller mill and prevent the adhesion of pulverized coal transported by air. Needs to be dried. To do this, hot air (around 200℃) is introduced into the mill, and the outlet temperature is kept at a constant value (80℃).
The temperature is controlled to be around 0℃).

On the other hand, recent coal-fired plants are increasingly required to rapidly change the load, and at this time the amount of coal supplied to the roller mill also changes rapidly. When the amount of coal supplied changes, the required inlet temperature also changes, but the roller mill body and the coal stored inside have a large heat capacity, so the outlet temperature does not change immediately. Therefore, if the outlet temperature is measured and controlled, when the coal supply rate changes rapidly, the feedback to the inlet temperature will be delayed and the outlet temperature will change significantly. Therefore, the above-mentioned conventional technology has the following problems. (1) If the supply amount increases rapidly, the outlet temperature will drop significantly, resulting in a decrease in pulverization efficiency and adhesion of pulverized coal. (2) If the supplied coal decreases rapidly, the outlet temperature will rise significantly, increasing the risk of coal ignition within the mill.

SUMMARY OF THE INVENTION An object of the present invention is to provide a roller mill device in which the outlet temperature does not fluctuate much when the amount of material to be crushed to be supplied to the roller mill changes.

[0006]

[Means for Solving the Problems] In order to keep the outlet temperature constant, the inlet temperature is controlled depending on the amount of material to be crushed.

[0007]

[Operation] By controlling the inlet temperature according to the supply amount of the material to be crushed, even if the supply amount of the material to be crushed changes rapidly, the inlet temperature will also change rapidly, so the change in the outlet temperature will be very small. becomes smaller.

[0008]

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4. In the figure, 1 is a roller mill, 2 is a material to be crushed, and 3 is a roller mill.
is the product, 4 is the fan, 5 is the hot air stove, 6 is the hot air damper,
7 is a cold air damper, 8 is a flow meter, 9 is the roller mill air inlet temperature, 10 is the roller mill air product outlet temperature, 11
12 is a table, 12 is a roller, 13 is a load, and 14 is hot air.

In the apparatus shown in FIG. 1, a program of the amount and temperature of inlet air relative to the supply amount of the material to be crushed 2 is set in advance. The flow meter 8 measures the amount of air supplied, and the opening degrees of the hot air damper 6 and the cold air damper 7 are controlled so that the amount and temperature 9 of the inlet air become predetermined values. In addition,
Since the inlet temperature for keeping the outlet temperature constant varies depending on the moisture in the material to be crushed, the inlet temperature program is changed depending on the moisture. Fluctuations in supply amount of material to be crushed (large, medium, small)
The program for the roller mill inlet temperature is shown in FIG. 3, and the relationship between the supply amount and the roller mill inlet/outlet temperature is shown in FIG.

0010

[Effects of the Invention] The roller mill device of the present invention includes a table that rotates around a vertical drive shaft, and a plurality of rollers that roll on the table and crush materials to be crushed between the table and the table. The roller mill is equipped with a mechanism for adjusting the amount and temperature of air supplied to the roller mill, a mechanism for detecting the air inlet temperature of the roller mill, and a mechanism for detecting the temperature of the air product outlet of the roller mill. By controlling the air inlet temperature according to the temperature and keeping the air product outlet temperature constant, the following effects are achieved. Even when the supply amount changes rapidly, the change in outlet temperature becomes small, and it is possible to prevent a decrease in pulverization efficiency due to a decrease in outlet temperature, adhesion of pulverized coal, or the risk of ignition of pulverized coal due to an increase in outlet temperature.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of the roller mill portion of FIG. 1;

FIG. 3 is a diagram showing the program of the air inlet temperature of the roller mill;

FIG. 4 is a diagram showing changes in inlet and outlet temperatures according to the present invention.

FIG. 5 is a diagram showing changes in inlet and outlet temperatures in a conventional device.

[Explanation of symbols]

1 Roller mill 2 Object to be crushed 3. Product 4 Fan 5 Hot stove 6 Hot air damper 7 Cold air damper 8 Flow meter 9 Inlet temperature

Claims (1)

[Claims] 1. A roller mill comprising a table that rotates around a vertical drive shaft, and a plurality of rollers that roll on the table and pulverize a material to be pulverized between the table and the roller mill. A mechanism for adjusting the amount and temperature of air, a mechanism for detecting the air inlet temperature of the roller mill, and a mechanism for detecting the air product outlet temperature of the roller mill are provided, and the air inlet temperature is adjusted according to the supply amount of the material to be crushed. A roller mill device characterized in that it is configured to control and maintain a constant air product outlet temperature.