JPS63162556A - Cement clinker burning facilities - 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] a. Industrial application field The present invention relates to a cement clinker firing apparatus.

B. Conventional technology Conventionally, a low-9' J-kiln equipped with a suspension preheater and a calcining furnace has been used for firing cement clinker.After the cement raw material is preheated by the suspension preheater, it is heated in the calciner. It is calcined in a rotary kiln to undergo a decarboxylation reaction, and then calcined in a rotary kiln to undergo a clinker production reaction and become cement clinker.

Problems to be solved by the C0 invention However, in the conventional equipment, the clinker production reaction was carried out only by a rotary kiln with poor heat exchange performance, which increased the load on the rotary kiln and inevitably required a large kiln. The unit heat consumption was also high.

d. Means for solving the problems As a result of the inventor's studies to solve these problems,
By introducing high-temperature gas into the calcining furnace, the preheated cement raw material is calcined in the furnace to perform the decarboxylation reaction and to perform most of the clinker production reaction, then the rotary kiln can be small. The present invention was completed based on the knowledge that the unit heat consumption also decreases.

That is, the gist of the present invention is that, in an apparatus equipped with a suspension preheater, a calciner, and a rotary kiln, a hot air generating furnace is attached to the calciner, and the calciner is equipped with a
A cement clinker firing apparatus is characterized in that a cement raw material preheated by a high-temperature gas at a temperature of 0.degree.

e. Examples Hereinafter, a cement clinker firing apparatus according to the present invention will be explained with reference to the drawings.

In Fig. 1, 1 is a suspension preheater section, 2 is a suspension preheater section;
3 is a calcining furnace, and 3 is a hot air generating furnace attached to the calcining furnace 2. 4 is a rotary kiln, 5 is a clinker cooler, 6 is a raw material feeder, 7 is a cyclone, 8 is a duct, 9 is a burner,
IO is a secondary air introduction pipe for combustion.

Now, the cement raw material input by the raw material input device 6 exchanges heat with the high-temperature exhaust gas in the duct 8, is separated from the exhaust gas in the cyclone, and is introduced into the lower duct 8'. Is the cement raw material below a cyclone? ',7',7#
It is preheated by repeating the heat exchange 9 separation while passing through the ducts 8' and 8''', and is then introduced into the calcining furnace 2. Gas is introduced.Thereby, the cement raw material is calcined and decarboxylated, and 30 to 70% of the clinker production reaction takes place in this calcining furnace.

That is, after instantaneous decarboxylation occurs in zone 1, a clinker ring reaction occurs, and a melt phase is formed in a portion of the zone.

In zone ■, raw material dust adheres to this melt phase, and the particles grow larger and become non-sticky to the furnace walls, etc.
Enter zone ■ (cyclone). Thus, 30-70% of the clinker reaction takes place in the calciner. The distribution of raw materials (■) and (2) is appropriate: ■;■-7:3 to 5:5.

Next, the cement raw material is introduced into the rotary kiln 4 and fired at 1450° C. or higher to complete the clinker production reaction and become clinker. After being cooled by the clinker cooler 5, it is taken out of the firing system. It will be done.

2 to 5 are other embodiments of the present invention, and the same numbers as in FIG. 1 indicate the same parts.

The one shown in Figure 2 has a hot air generating furnace arranged vertically, and the one shown in Figure 3 has a hot air generating furnace installed at the bottom of the calcining furnace.
Fig. 4 shows a case in which a hot air generating furnace is attached near the top of the calcining furnace, and Fig. 5 shows a case in which a hot air generating furnace is attached on both sides of the calcining furnace.

In either embodiment, the operation is substantially the same as that shown in FIG.

When cement clinker was manufactured using the cement clinker firing KR shown in Figure 1, the calorific value was approximately 10% lower than that of a rotary kiln equipped with a suspension preheater equipped with a conventional calciner as shown in Figure 6. .

r. Effects of the Invention According to the cement clinker firing apparatus of the present invention, 30 to 70% of the clinker production reaction is performed in the calcining furnace.
The length of a rotary kiln with poor heat exchangeability can be reduced by 30 to 70% compared to conventional rotary kilns, and therefore the unit heat consumption can be greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing the entire cement clinker firing apparatus of the present invention, and FIGS. 2 to 5 show different embodiments of a calcining furnace and a hot air generating furnace in the cement clinker firing apparatus of the present invention. FIG. 6 is a conceptual diagram of a conventional suspension preheater and a rotary kiln with a calcining furnace. ■...Suspension preheater, 2...Calcination furnace, 3...Hot air generating furnace, 4...Rotary kiln, 5...Cooler. Patent applicant Nippon Cement Co., Ltd. - Nima T'Takashi ---. Agent Patent Attorney Nao Ka Okuyama ,,12
-~N -・□ (2 others) Figure 1 Figure 6 N

Claims (1)

[Claims] In an apparatus equipped with a suspension preheater, a calcining furnace, and a rotary kiln, a hot air generating furnace is attached to the calcining furnace, and a high-temperature gas of 1200°C or higher and cement raw material preheated by the suspension preheater are introduced into the calcining furnace. A cement clinker firing apparatus characterized in that a clinker production reaction is carried out in the calcining furnace.