JPS60141653A - Quick lime manufacturing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing quicklime, and more particularly to an apparatus for producing quicklime which is mainly comprised of a quicklime crushing apparatus configured to prevent contact between quicklime and air containing moisture. It is.

When quicklime contains water, it becomes CaO+J(20-+Ca(
OH) 2 As mentioned above, it reacts with water and becomes slaked lime.

Note that quicklime is used, for example, in the manufacture of steel, and in that case, during inspection, quicklime is charged and oxygen is blown in to remove oxygen, remove silicon, and dephosphorize.

Molten steel is made by removing one impurity through desulfurization, etc.

In that case, if slaked lime that contains moisture or quicklime that absorbs moisture is used, the moisture will remain in the molten steel as hydrogen, which will deteriorate the properties of the steel.

This is especially a problem when producing special steel.

Therefore, in the past, when the quicklime that came out of the kiln was classified in a classifier, a nitrogen gas was blown into the classifier to prevent the quicklime from coming into contact with air containing moisture, or a separate Crushing and classification was carried out while supplying dry air that had been dehumidified by a dehumidifier.

However, if 1 nitrogen gas is used, a nitrogen gas blowing device and nitrogen gas cost are required, and if you try to supply dry air that has been dehumidified by a dehumidifier.

These devices are required separately, and in any case, there is a disadvantage that it is economically disadvantageous or that the entire device becomes large.

The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional method, and it prevents quicklime from coming into contact with moisture-containing air, thereby preventing quicklime from reacting with moisture and turning into slaked lime. The purpose of the present invention is to provide an economical apparatus for producing quicklime.

In order to achieve the above object, the present invention takes advantage of the fact that the cooling air in the cooling zone of the quicklime kiln contains moisture and crushes it into a closed system. The structure is designed to be used as transport air for waste machines, classifiers, etc.

The present invention will be described in detail below based on an embodiment shown in one drawing.

FIG. 1 illustrates one embodiment of the present invention.

In the figure, the symbol 1 is a belt conveyor.

As a result, limestone is charged into the lime kiln 2.

The lime calcining furnace 2 has a preheating zone C1 at its upper end, a firing zone B at its middle portion, and a cooling zone A at its lower end.

Cooling air is fed into the cooling zone A from the air supply port to cool the calcined quicklime.

In addition, an exhaust gas fan 4 is connected to the preheating zone C side.
The exhaust gas in the lime kiln furnace 2 sucked by the exhaust gas fan 4 has dust removed by the dust collector 5, and then
Either it is exhausted into the atmosphere, or the amount of heat contained in the exhaust gas is used as a heat source.

On the other hand, the quicklime leaving the 1-lime calcining furnace 2 is transported by a transporter 6 and fed into a crusher 9 by a 2-air lock feeder 7 while being degassed.

The quicklime crushed by the crusher 9 is guided to the classifier 10 by a dehumidified air flow as described later, where it is classified, and the coarse powder is returned to the crusher 9, leaving only fine powder. The particles are guided by the air flow through piping 11 to a fine powder collection device 12 consisting of a cyclone, a bag filter, etc., where they are collected. It is stored in tank 14.

After the fine powder has been collected, the gas is attracted by the induction fan 15 and blown into the crusher 9 side through the air pipe 16.

17 is a heat exchanger 2 One end of this heat exchanger is connected to the gas extraction pipe 22 provided at the upper part of the cooling zone A of the lime kiln 2 by an inlet pipe 22, and the other end is connected to the is connected to the fine powder collection device 12 via the fan 19 and the inlet pipe 22.
and the induction fan 15.

The cooling air used in the heat exchanger 17 is supplied through the fan/20, and within the heat exchanger 17, heat exchange is performed with the dry air sucked from the cooling zone A, and the heated cooling air is heated. is used as combustion air for the firing burner 21.

The cooling air blown into the cooling zone A has a cooling effect on the quicklime after combustion, but when it comes into contact with the high-temperature quicklime, it is heated to, for example, 50°C to 400°C, and this air is used for heat exchange. The air is guided to the container 17 side, heat exchange is performed, and the air becomes around 70 to 80℃.2 Classifier 1o
It is used as conveying air and classification air on the side.

In this embodiment, there are one or more i1.

In the closed system, air from the cooling zone of the lime kiln is used as transport air and classification air.
It is extremely economical because there is no need to use nitrogen scum or air dehumidified by a dehumidifier as in the conventional method.

In addition, since the cooling air comes into contact with the hot quicklime immediately after firing, the moisture contained in it is completely removed and the dry air is in a dehumidified state. When used as conveying air and classification air, there is no contact between quicklime and moisture in the air, and the phenomenon that burned quicklime reacts with water to become slaked lime never occurs.

FIG. 2 illustrates another embodiment of the invention.

In the figure, the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, water is used as the cooling medium for the heat exchanger 17 instead of air. This water.

Since heat is exchanged with the high-temperature dry air sucked from the cooling zone A of the lime kiln 2, it is discharged as steam or hot water, which can be recovered and used as a heat source or other purposes. 23 is a water supply device such as a pump.

As is clear from the following explanation, according to the present invention, dry air sucked from the cooling zone of a lime kiln is used as air for transporting fine powder and for classification on the classifier side in a closed system device. Because of this, there is no contact between the calcined quicklime and moisture in the air.

There is no disadvantage that quicklime reacts with water to become slaked lime.

In addition, since air sucked from the lime kiln side is used as air for transportation and classification, there is no need to use nitrogen gas or air obtained from a separate dehumidification device, resulting in significant cost reductions. This makes it possible to simplify the equipment.

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic configuration diagrams showing different embodiments of the present invention. 2. Firing furnace, B... Cooling air suction [1°7.
1Ro...Air lock damper, 9...Crusher,
10... Classifier, 12... Fine powder collection device, 14
...Product tank, 16...Air piping 117.
... Heat exchanger, 18... Dregs extraction port. 21...Burner, 22...Feed pipe Patent applicant
Ube Industries Co., Ltd.

Claims (1)

[Claims] A lime kiln, a crusher that crushes the quicklime fired in the lime kiln, a classifier that classifies the quicklime crushed by the crusher by placing it on an air stream, and a classifier that places the classified fine powder on an air stream. In an equipment for producing quicklime, which is equipped with a fine powder collection device that transports quicklime and collects it as a product using a fine powder collection device, the fine powder collection device and the crusher are connected by piping, and the crusher, classifier, and conveyor are connected by piping. In addition to constructing the air system as a closed system isolated from the outside air, the gas in the cooling zone of the lime calcining furnace was designed so that dry air drawn from the cooling zone of the lime calcining furnace could be used as the conveying air and classification air. A quicklime production device characterized by providing an inlet pipe between the extraction port and the middle of the air piping behind the fine powder collection device.