JPH0450515B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for baked ingots, and more particularly to a device that can properly cool baked ingots at all times regardless of the amount of baked ingots discharged from firing.

Various types of baked ingots, including cement clinker, need to be cooled to a predetermined temperature after being discharged from a baking device such as a rotary kiln. For example, in the case of cement clinker, the temperature at the time it is 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 baked ingot. One of these methods is to cool the baked ingot with air while transporting it a certain distance, and then raise the temperature by exchanging heat with the baked ingot. A method is often used in which the air is used as combustion air for a sintering device. In this case, the amount of baked ingots discharged from the baking device is not necessarily constant, so if the device is always operated at a constant speed, the baked ingots may not be cooled sufficiently, or conversely, unnecessary cooling air may be supplied. Such inconveniences may occur. For this reason, a method has heretofore been implemented in which the operating speed of the apparatus is varied in accordance with the amount of baked ingots, but the following problems arise, and a solution is desired.

That is, as the capacity of cooling equipment increases, the equipment itself also becomes larger. For example, in the case of a large cooling equipment with a cooling capacity exceeding 8000 t/D, the total length reaches 50 to 60 m. Therefore, even if the amount of baked ingots discharged from the baking device increases, if the operating speed of the device is immediately increased in response, power will be used unnecessarily on the downstream side in the direction of transferring the baked ingots. Become. On the other hand, if the operating speed of the apparatus is reduced in response to a decrease in the amount of baked ingots, problems such as insufficient cooling will occur. In any case, such inconveniences arise from controlling such a large device as a whole, and more precise control is required.

It is an object of the present invention to provide an apparatus that satisfies the above-mentioned needs and is capable of always properly cooling the baked ingots regardless of the amount of the baked ingots.

In short, this invention provides a moving speed controlled type of baked ingot cooling system in which a grate for transferring baked ingots is composed of a plurality of unit grates, and each unit grate is provided with a speed-adjustable drive device and an air chamber for supplying cooling air. The device includes means for detecting the layer thickness on the grate by detecting the air pressure in the air chamber, and if the detected value is higher than a set value, increasing the moving speed of the baked ingot by the drive device, and This is a movement speed controlled type sintered ingot cooling device characterized by being provided with means for increasing the amount of cooling air by increasing the damper opening degree of the air supply pipe in accordance with the sintered ingot movement speed.

An embodiment of the present invention will be described below with reference to FIG. Reference numeral 2 denotes a grate arranged in the main body 1 of the sintered ingot cooling device, of which the fixed plate 2b is fixed at a predetermined position, but the movable plate 2a is reciprocated by each driving device 3, 4, 5. The baked ingot is transferred by movement relative to the fixed plate. As shown in the figure, there are three plates, 2A, 2B, and 2C, which are made up of a plurality of fixed plates and movable plates.
It is divided into groups of unit grates, each of which is driven by a drive device 3, 4, 5, respectively. 6
7 is a rotary kiln which is a firing device, and 7 is a burner for the rotary kiln.

On the other hand, air chambers 8, 9, 10, 11, and 12 are partitioned through partition walls at the bottom of the grate.
Cooling air supply pipes 13, 1 for each air chamber
4, 15, 16, and 17 are connected. 18,1
9 and 20 are pressure measuring devices that measure the pressure inside each air chamber 8, 10, and 12, and by measuring the pressure inside the air chamber, the baked ingot 21 on the grate plate is
Detect the layer height. 22, 23, 24 are speed control devices that control the operating speed of each drive device 3, 4, 5, and change the speed of the drive device by inputting signals from the pressure measurement devices 18, 19, 20,
The transfer speed of the baked ingots on each unit grate 2A, 2B, 2C is changed. The signals of each pressure measuring device are transmitted by dampers 26, 27, 28, 2 installed in each air supply pipe.
9 and 30, and controls the operation of each drive device and at the same time adjusts the opening degree of the damper to supply an amount of air corresponding to the transfer speed of the baked ingot.

Next, the operating state of this device will be explained.

The baked ingot 21 discharged from the rotary kiln 6 is gradually transferred toward the discharge port 31 by the relative movement of the grate plate, and during this time, the cooling air A supplied to each air chamber passes through the baked ingot layer. , cool the baked mass. Among the air heated by cooling the baked ingot, the high temperature air on the upstream side is used as combustion air for the rotary kiln 6 to save energy. On the other hand, relatively low temperature air on the downstream side is exhausted from the exhaust port 32. A pressure meter 33 measures the pressure at the opening of the rotary kiln, and adjusts the opening degree of the damper 34 in accordance with the measured pressure to adjust the amount of air supplied to the rotary kiln.

Each pressure measuring device 18, 19, 20 measures the pressure inside each air chamber, thereby measuring the pressure in each unit grade 2.
The layer height of the baked ingots on A, 2B, and 2C is detected, and if the layer height is higher than the set value, a command signal is issued to the drive device to increase the transfer speed of the baked ingots. In addition, in response to this, the opening degree of the damper of each air supply pipe is increased in accordance with the baked ingot transfer speed to increase the amount of cooling air.
To prevent baked ingots from being insufficiently cooled. This control is performed for each unit grate 2A, 2B, and 2C to cool the baked ingot. Note that reference numerals 35, 36, and 37 are repeaters that relay signals from each pressure measurement device and distribute the signals to each speed control device and damper.

Next, reference numeral 38 is a control box having a storage function and a central control function, and the above-mentioned control may be performed using this control box. In this case, all the signals from the pressure measuring devices 18, 19, and 20 are once input to the control box 38, and the control box 38 thereby calculates the distribution state of the layer height of the baked ingot layer over the entire length of the grate 2, Corresponding to this distribution state, command signals are issued to the repeaters 35, 36, and 37 to control the transfer speed of the baked ingots and the amount of cooling air as a whole. When control is performed via the control box, the entire cooling device is controlled in an integrated manner, so there is almost no control delay in each part.

By carrying out the present invention, even if the amount of baked ingots discharged from the firing apparatus fluctuates, the baked ingots can be properly cooled at all times.

[Brief explanation of the drawing]

FIG. 1 is a control system diagram of the sintered ingot cooling device according to the present invention. 1... Baked ingot cooling device main body, 2... Grate, 2
A, 2B, 2C...Unit grade, 3, 4, 5...
... Drive device, 8, 9, 10, 11, 12 ... Air chamber, 13, 14, 15, 16, 17 ... Cooling air supply pipe, 18, 19, 20 ... Pressure measurement device,
21... Baked ingot, 22, 23, 24... Speed control device, 26, 27, 28, 29, 30... Damper,
38...Control box, A...Cooling air.

Claims (1)

[Claims] 1. In a moving speed control type baked ingot cooling device in which the grate for transferring baked ingots is composed of a plurality of unit grate, each unit grate is provided with a drive device capable of adjusting the speed and an air chamber for supplying cooling air. A means for detecting the layer thickness on the grate by detecting the air pressure in the room, and if the detected value is higher than a set value, the moving speed of the baked ingot by the drive device is increased, and the air supply pipe to the air chamber is 1. A movement speed control type baked ingot cooling device, comprising means for increasing the amount of cooling air by increasing the damper opening degree in accordance with the moving speed of the baked ingot.