JPH01168362A - Method for controlling coal feed in vertical mill - Google Patents

Abstract

PURPOSE:To improve the compliance of actual coal feed amount in accordance with unit load variations with the coal feed requirements, by actuating a driving means in response to load variation rate upon unit load variations to adjust the vane angle of a separating vane, thereby controlling coal feed amount. CONSTITUTION:A driving device 22 is provided to adjust the vane angle of a separating vane 9 in a coarse particle separator 12 of a vertical mill. The driving device 22 is actuated in response to the load variation rate upon unit load variations to adjust the aforesaid vane angle, thereby controlling coal feed amount. More specifically, retarded changes in the actual coal feed amount against the coal feed amount requirements resulting from the adjustment of the amount of coal fed to the mill upon unit load variations is corrected by adjusting the vane angle of the separating vane, whereby a precise control of the actual coal output can be effected in accordance with the coal feed amount requirements.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for controlling the amount of coal produced in a vertical mill.

[Prior art] Fig. 5 shows an example of a vertical mill, in which the main body casing 1
A crushing table 5 having a crushing mill 4 rotated by a motor 3, and a crushing roller provided to press the raw coal a input from a coal input pipe 2 provided at the upper center of the mill against the crushing mill 4. 6 to carry out pulverization, and cause the pulverized coal produced by the pulverization to float upward in the main body casing 1 by the primary air introduced from the lower side via the primary air supply lower and the air port 8, A coarse powder separator 12 consisting of a separation vane 9, an eject chute 10, and a discharge pipe 11 provided at the upper part separates the coarse powder C into pulverized coal d of the required fineness, and then the fine powder is passed through a fuel pipe 13. It is supplied to burners such as charcoal-fired boilers.

Fig. 6.7 shows details of the separation vane 9, in which the vane 15 is rotatably attached to the fixing ring 14 provided at the upper part of the eject chute 10 at a required interval in the circumferential direction. The vane arms 16 formed integrally with each vane 15 are successively connected to each other by a connecting rod 17,
Also, a drive shaft 19 rotated by a handle 18.
A lever 20 fixed to the drive shaft 19 and one of the vane arms 16 are connected by a connecting rod 2I, and the opening degrees of all the vanes 15 can be adjusted simultaneously by operating the handle 18. That's what I do.

In the vertical mill described above, the opening degree of the vane 15 is manually set via the handle 18 during a test run of the vertical mill.
Thereafter, with the vane opening degree constant, primary air is supplied from the primary air supply lower, and the amount of coal a supplied from the coal supply device (not shown) via the coal input pipe 2 is changed. , the amount of pulverized coal d drawn out from the fuel pipe 13 is adjusted.

[Problems to be Solved by the Invention] However, in the conventional device described above, the opening degree of the vane 15 of the separation vane 9 is manually set during the test run, and the amount of coal output is adjusted by entering the mill via the coal input pipe 2. Since this is done only by changing the input amount of coal a to be supplied, even if there is a demand for coal output due to unit load fluctuations as shown by the broken line in Figure 8, coal a is pulverized from the input and becomes pulverized coal. It takes time for the coal to be conveyed by the primary air chamber and further to be drawn out through the coarse powder separator 12, which has the problem of causing a large delay in the actual amount of coal produced, as shown by the solid line.

The present invention was made by focusing on the above-mentioned conventional problems.
The purpose of this project is to improve the follow-up ability of the actual coal output amount to the coal output request when the unit load fluctuates in a vertical mill.

[Means for solving the problems] The present invention attempts to solve the above technical problems, and
A drive device is provided to adjust the vane opening of the separation vane in the coarse powder separator of the vertical mill, and the drive device is operated to adjust the vane opening in accordance with the load change rate when the unit load fluctuates. The present invention relates to a method for controlling the amount of coal output from a vertical mill, which is characterized by controlling the amount of coal.

[Function] Therefore, in the present invention, when the unit load fluctuates, the delay in the change in the actual amount of coal output in response to the coal output request, which is performed by adjusting the amount of coal supplied to the mill, is adjusted by adjusting the vane opening degree of the separation vane. By correcting this, the actual amount of coal produced can be made to follow the demand for coal production.

[Implementation example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an apparatus for carrying out the method of the present invention, and the same reference numerals as in FIG. 5 represent the same parts.

As shown in the figure, the drive shaft 19 is rotated by power from a drive device 22, and a coal output request signal 23 is introduced into a coal supply device 24 to control the amount of coal a supplied to the mill. The coal output request signal 23 is transmitted to the control device 2.
5, and the drive device 22 is controlled by a control command 26 from the control device 25.

2 and 3 show an example of the drive device 22. In FIG. 2, a worm shaft 28 provided on the rotating shaft of the motor 27 is meshed with a worm wheel 29 provided on the drive shaft 19, and the motor 27 FIG. 3 shows a system in which a cylinder rod 31 of a cylinder 30 is connected to a lever 32 provided on the drive shaft 19, and the expansion and contraction of the cylinder 30 rotates the drive shaft 19. This shows a method for performing rotation.

” 1, when the unit load changes, the coal output request signal 2
3 is introduced into the coal supply device 24 to change the supply amount of coal a to the mill, and at the same time, the coal output request signal 23 is input to the control device 25, and the control device 25 controls the separation vane 9 according to the control command 2B. The vane opening degree is controlled according to the unit load change rate.

As a result, pulverized coal d having a fineness corresponding to the opening degree of the vane 15 is led out through the fuel pipe 13, and the amount of coal produced is immediately controlled, so that the actual amount of coal produced is controlled as shown in FIG. It becomes possible to control the coal output closely.

At this time, the adjustment of the vane 15 is based on the coal a supplied to the mill.
This is done while observing changes in the amount of coal produced due to changes in the amount of coal supplied (measured in advance). Further, this control can be performed whether the amount of coal produced is increased or decreased.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and that the drive system for automatically adjusting the vane opening degree can be modified in various ways without departing from the gist of the invention. Of course, there are things that can be done.

[Effects of the Invention] As described above, according to the method for controlling the amount of coal output from a vertical mill of the present invention, when the unit load fluctuates, the actual amount of coal output can be controlled in response to the coal output request by adjusting the amount of coal supplied to the mill. The delay in change is corrected by adjusting the vane opening degree of the separation vane, thereby producing an excellent effect in which the actual coal production amount can be accurately controlled to follow the coal production request.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a device for implementing the method of the present invention, FIG. 2 is an explanatory diagram showing an example of the drive device in FIG. 1, and FIG. 3 is an explanatory diagram showing another example of the drive device in FIG. 2. Figure 4 is a diagram showing the relationship between the vane opening degree and coal output amount in the present invention and time, Figure 5 is an explanatory diagram showing an example of a conventional mill, and Figure 6 is a diagram showing the relationship between the vane opening degree and coal output amount and time in the present invention. An explanatory diagram showing an example, Fig. 7 is the 6th
The plan view of the figure and FIG. 8 are diagrams showing the relationship between the conventional vane opening degree, coal output amount, and time. ■ is the main body casing, 2 is the coal input pipe, 7 is the primary air supply port, 9 is the separation vane, 10 is the eject chute, 1
2 is a coarse powder separator, 13 is a fuel pipe, 14 is a fixing ring, 1
5 is a vane, 1B is a vane arm, 17 is a connecting rod,
19 is a drive shaft, 20 is a lever, 21 is a connecting rod, 22 is a drive device, 23 is a coal output request signal, 24 is a coal supply device,
25 is a control device, 27 is a motor, 28 is a worm shaft, 2
9 is a worm wheel, 30 is a cylinder, 31 is a cylinder rod, and 32 is a lever.

Claims (1)

[Claims] 1) Providing a drive device for adjusting the vane opening degree of the separation vane in the coarse powder separator of the vertical mill, and adjusting the vane opening degree by operating the drive device according to the rate of change in load when the unit load fluctuates. A method for controlling the amount of coal produced in a vertical mill, characterized by controlling the amount of coal produced by a vertical mill.