JPH0665619B2 - Ingot cooling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for cooling ingots discharged from a firing apparatus.

Various ingots such as cement clinker need to be cooled to a predetermined temperature after being discharged from a firing device such as a rotary kiln. For example, in the case of a cement clinker, the temperature at the time of being discharged from the firing device is about 1300 to 1500 ° C, and this clinker is cooled to about 70 ° C. Several methods have been proposed for cooling the ingot, but as one of these methods, the ingot is cooled by air while it is transported for a certain distance, and the temperature is raised by heat exchange with the ingot. A method of using air as combustion air for a firing apparatus is widely used. In this case, the amount of ingots discharged from the firing device is not always constant, so if the device is constantly operated at a constant speed, insufficient cooling of the ingots will occur, or conversely, unnecessary cooling air will be supplied. It causes inconvenience such as For this reason, a method of changing the operating speed of the apparatus according to the amount of the ingot has been conventionally practiced, but the following problems occur, and their solution is desired.

That is, as the capacity of the cooling device increases, the size of the device itself also increases. For example, in the case of a large cooling device having a cooling capacity of more than 8000 t / D, the total length reaches 50 m to 60 m. Therefore, even if the amount of ingots discharged from the firing device increases, for example, if the operating speed of the device is immediately increased, the amount of ingots still increases on the downstream side in the ingot transfer direction. Not use the power unnecessarily. On the other hand, if the operating speed of the apparatus is reduced in response to the decrease in the amount of ingot, problems such as insufficient cooling may occur. In any case, such an inconvenience occurs because such a long device is controlled as a whole, and a finer control is required.

Therefore, the applicant has filed an application for the improved control method in JP-A-56-45855.

This is to output a control signal from the pressure signal of the cooling air chamber at the receiving end of the high temperature ingot to the damper of the downstream air supply pipe via the time lag calculator, and control the damper of the air supply pipe of the downstream air chamber in sequence. Is to do.

However, the ingot on the grate (floor) of the high-temperature ingot cooling device becomes a mountain-shaped volume because the ingot supply from the kiln drops, and a non-average layer thickness occurs in the width direction of the ingot cooling device, and from the thin layer Since various types of cooling air are blown through, various measures have been taken conventionally. For example, when the ingot supply amount from the kiln suddenly increases, the air pressure in the first air chamber rises. Therefore, the air pressure signal increases the cooling air amount in the first chamber to increase the speed of the grate, and the ingot of the increased layer thickness is downstream. It is sent to the grate in the side chamber to reduce the thickness of the ingot layer on the first chamber.

However, in this case, the non-average thickness of the ingot in the width direction of the ingot cooling device moves to the downstream grate without being removed, and the tendency for air to blow through the thin clinker layer still remains, Only the supply amount of the cooling air to the downstream air chamber is changed, and in the same state, the cooling air is further moved to the ingot discharge end via the downstream grate. Therefore, there is a problem that the cooling air amount is wasted and the cooling efficiency is poor.

In view of the above problems, the inventors have proposed the following device in addition to the present invention. That is, a device in which the ingot transfer means of one device is divided into a plurality of parts, and the operating speed can be adjusted independently of each other, and the cooling air supply amount can also be adjusted in accordance with the ingot transfer speed, is provided. Proposed. Since this device measures the indoor pressure for each of the air chambers formed under the ingot transfer means and performs control based on this measurement result, precise control can be performed, but the device becomes complicated and expensive. There is a problem.

An object of the present invention is to eliminate the above-mentioned problems and to provide an ingot cooling device which has a relatively simple structure and can perform good control of ingot cooling.

In short, the present invention divides the lower side of the grate for transferring the ingot into a plurality of air chambers, sends a signal of the air pressure of the first air chamber on the side receiving the ingot to the timer, and burns the signal from the timer. In a slag cooling device for sequentially controlling a damper provided in an air supply pipe connected to an air chamber downstream in the lump transfer direction, the grate is divided into a plurality of stages of a unit grate with a driving device, and the signal of the timer is used to The ingot cooling device is provided with a signal circuit for controlling the damper unit control device and the unit grate drive device at the same time.

Examples of the present invention will be described below.

In FIG. 1, reference numeral 1 is a main body of the ingot cooling device, and 2 is a great plate which is a ingot transfer member. Of the great plates, the fixed plate 2b is fixed at a predetermined position, but the movable plate 2a reciprocates by the respective driving devices 3, 4, 5 to make a relative motion with the fixed plate. Transfer the ingots. This great plate is divided into three groups of unit great plates 2A, 2B, and 2C as shown in the drawing, and the great plates of each group are respectively the drive unit 3,
Driven by 4 and 5. Reference numeral 6 is a total kiln which is a firing device, and 7 is a burner for a rotary kiln.

On the other hand, air chambers 8, 9, 10, 11, 12 are formed in the lower part of the great plate through partition walls, and cooling air supply pipes 13, 14, 15, 16, 17 are provided for each air chamber. Are connected.
Reference numerals 18, 19, 20, 21, and 22 are dampers provided for the respective air supply pipes. Reference numeral 23 is a pressure controller provided in the air chamber 8 at the most upstream side of the ingot flow, and this pressure controller is connected to the speed controllers 25, 26, 27 via a timer 24 by a signal circuit. The speed controller adjusts the opening degree of the dampers 18 to 22 and the speeds of the driving devices 3, 4, and 5.

Next, the operating state of the present invention will be described.

The ingot 30 discharged from the rotary kiln 6 is gradually transferred toward the outlet 31 by the relative movement of the great plate, during which the cooling air A supplied to each air chamber passes through the ingot layer. , Cool the ingot. Among the air heated by cooling the ingot, the high temperature air on the upstream side is used as the combustion air for the rotary kiln 6 to save energy. On the other hand, the relatively low temperature air on the downstream side is discharged from the exhaust port 32.

In the above state, the pressure controller 23 constantly measures the pressure of the air chamber 8, and if the indoor pressure rises while the air amount corresponding to the predetermined amount of ingot 9 is being supplied, the next control is performed. I do. That is, an increase in the room pressure means an increase in the bed height of the ingot layer above the air chamber 8, and means that the amount of the ingot to be cooled has increased. Therefore, if the transportation speed of the ingot is kept as it is, the bed height continues to rise and cooling becomes impossible. Therefore, when the pressure increase signal from the pressure controller 23 is input, the timer 24 is turned on and first issues a command signal to the speed controller 25. The signal from the speed controller 25 raises the operating speed of the drive unit 3 to increase the transfer speed of the ingot, and the dampers 18 and 19 are opened to prevent insufficient cooling of the ingot as the transfer speed increases. When the timer is turned on, command signals are issued in order to the speed controllers 26 and 27 with a preset time interval, and the operating speed and air supply amount of each Great Plate corresponding to the movement of the ingot To control. In addition, when the increase amount of the ingot is not so large, the transfer rate of the ingot may not be adjusted and only the air supply amount may be used.

By carrying out the present invention, the air pressure in the first air chamber is detected, and the downstream grate of the ingot flow has the drive device and the dampers of the respective cooling air supply pipes, so that the changed clinker layer is generated. When it comes to each independent downstream grate, the driving speed and the supply air amount can be changed and controlled by the timer at the same time, so that the ingot layer thickness on the grate can be averaged and the ingot temperature control and cooling efficiency can be improved. The device has the effect of increasing.

[Brief description of drawings]

FIG. 1 is a control system diagram of an ingot cooling device showing an embodiment of the present invention. 1 …… Ingot cooling device 2 …… Great plate 2A, 2B, 2C …… Unit great plate 3,4,5 …… Drive device 8,9,10,11,12 …… Air chamber 13,14,15, 16,17 …… Cooling air line 18,19,20,21,22 …… Damper 23 …… Pressure controller 24 …… Timer 25,26,27 …… Speed controller 30 …… Ingot

Claims (1)

[Claims] 1. A first part on a side for receiving the ingots from the kiln by dividing the lower part of the grate for transferring the ingots into a plurality of air chambers.
In the ingot cooling device, which sends a signal of the air pressure of the air chamber to a timer to sequentially control a damper provided in an air supply pipe connected to an air chamber downstream in the ingot transfer direction by the signal from the timer, the grate driving device An ingot cooling device, characterized in that it is divided into a plurality of stages of attached unit grades, and a signal circuit for controlling the damper and simultaneously controlling the drive unit of the unit grades is provided by the signal of the timer.