JPH06287039A - Apparatus for producing cement clinker - Google Patents

Abstract

PURPOSE:To provide an apparatus capable of sufficiently diffusing preheated raw material powder in a low-temperature area and leading to a local high- temperature area and making throat diameter large without impairing granulating property, retaining height of a corn part to definite height even in scale up and remarkably reducing the equipment cost. CONSTITUTION:A porous dispersing plate 16 is fitted in a throat 15 for vertically connecting a granulating furnace 4 to a burning furnace 7 and simultaneously a local high-temperature area (a) is formed in the vicinity of central part above this dispersing plate 16 to provide both effects of spouted bed and fluidized bed in the granulating furnace 4 and one sides, the preheated cement raw material powder is fed to a corn part 4c formed in the granulating furnace 4 to form a downward moving bed (b) and the raw material powder is sufficiently diffused by this moving bed (b) and reached the local high-temperature area (a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved cement clinker manufacturing apparatus.

[0002]

2. Description of the Related Art A suspension preheater, a single-hole spouted bed granulation furnace, a fluidized bed firing furnace, and a cooling device are provided below the spouted bed granulation furnace with a plurality of burners facing each other. There has been proposed a cement clinker manufacturing apparatus in which a local high temperature region is formed and a preheating raw material is introduced into the upper side of the local high temperature region. (For example, see JP-A-62-230657) This cement clinker manufacturing apparatus is a combination of a single-hole spouted bed granulation furnace and a fluidized bed firing furnace. It is necessary to increase the flow rate in order to prevent the raw material powder from falling directly, which increases the amount of raw material powder that pops out of the spouted bed granulation furnace, which leads to instability in operation due to fine powder circulation and faster fueling such as faster coaching growth. Problems such as occur. Further, when the scale is increased, not only the problems of straight fall and popping out become more serious, but also the height of the spouted bed granulating furnace freeboard becomes extremely large, while the pressure loss becomes large.

A cone portion is formed in the lower portion, and the throat portion of a spouted bed granulation furnace connected to a fluidized bed firing furnace through a throat has a porous structure, and burners are arranged opposite to each other on the upper portion of this porous structure. At the same time, there is proposed a spouted bed granulation furnace in which a chute for supplying the preheating raw material powder is provided obliquely downward on the upper part of the cone portion. (For example, the actual Kaihei 4-1103
It is recognized that the throat part of the spouted bed granulation furnace has a porous structure to reduce the problems of the raw powder falling directly and popping out, but a local high temperature region is formed in the central part to improve the granulation property. In order to hold the throat, the size of the throat cannot be increased so much, and the pressure loss also increases, which limits the scale up.

The object of the present invention is to sufficiently disperse the preheated raw material powder in a low temperature region and guide it to a local high temperature region so that the throat diameter can be increased without impairing the granulation property and the inverse truncated cone part (cone part). An object of the present invention is to provide a device which can be maintained at a constant height even if the height is scaled up and the equipment cost can be significantly reduced.

[0005]

The constitution of the present invention which solves the problems of the prior art is to put the cement raw material powder preheated by a preheating means such as a suspension preheater into a granulating furnace and granulate the granulated product. In a cement clinker manufacturing apparatus that cools and recovers by a cooling means after firing in a firing furnace through a discharge chute, a center directly above a dispersion plate having a perforated plate structure provided in a throat portion between the granulation furnace and the firing furnace. A fuel supply means for forming a local high temperature region is arranged near the section to configure the granulation furnace in a jet fluidized bed structure, while a temperature lower than the local high temperature region is formed in the lower portion of the jet fluidized bed granulation furnace. The granules form an inverted truncated cone part (cone) capable of forming a downward moving layer, and a means for blowing and supplying preheat cement raw material powder to the moving layer is connected to the side wall of the inverted truncated cone part. , Semen The raw material powder is sufficiently diffused by the moving layer is obtained so as to reach the local hot region.

[0006]

[Function] The fuel is blown near the central portion immediately above the porous dispersion plate provided in the throat to form a local high temperature region, and the preheated cement raw material powder is blown into the moving layer from the side wall of the cone portion to move the raw material powder into the moving layer. Diffuse sufficiently to reach the local high temperature range.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, details of embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a flow sheet of the device of the present invention, FIG. 2 is a sectional view of a main part of a spouted bed granulation furnace, and FIG. 3 is a sectional view taken along the line AA of FIG.

An overall system of the apparatus will be described with reference to FIG. 1. 1 is a suspension preheater, and the suspension preheater 1 is composed of cyclones C ₁ , C ₂ , C ₃ and C ₄ and a calcining furnace 2. Raw material charging chute 3
The cement raw material powder introduced into the system from Cyclone C
₄ → C ₃ → C ₂ → calcining furnace 2 → cyclone C ₁ After being preheated, it is put into the granulating furnace 4. The granulated product sized in the granulating furnace 4 is put into a fluidized bed calcining furnace 7 through an overflow chute 5 through an L-valve (airtight discharging device) 6 and calcined in the fluidized bed calcining furnace 7. After that, it is primarily cooled in the fluidized bed cooler 8 and then secondarily cooled in the packed bed cooler 9 and recovered as cement clinker. The hot air of the fluidized bed cooler 8 is connected to and collected in the upper part of the fluidized bed firing furnace 7, and the packed bed cooler 9 is also collected.
The hot air is connected to the wind box 10 of the fluidized bed firing furnace 7 and collected. In the figure, 11 and 12 are push blowers,
13 is a pulverized coal fuel supply line, and 14 is a heavy oil burner. In such a cement clinker manufacturing apparatus, the present invention is an improvement of the granulating furnace 4 as described below.

The details of the granulation furnace 4 will be described with reference to FIGS. A perforated plate structure (hole diameter 20 to 20) is provided above the throat 15 which vertically connects the granulating furnace 4 and the fluidized bed firing furnace 7.
100 mm) of the dispersion plate 16 is disposed, and the pulverized coal fuel supply line 13 and the heavy oil burner 14 are provided in the vicinity of the center of the upper surface of the dispersion plate 16 so as to face each other. The area a is formed. On the other hand, the granulation furnace 4 is provided with a cylindrical portion 4b that constitutes a freeboard portion 4a.
And, at a temperature lower than the local high temperature region a, the granulated material can form a downward moving bed b as shown by an arrow, and the inverted truncated cone part (cone part) has a height substantially equal to the fluidized bed height. ) 4
and c. That is, the granulating furnace 4 is configured to have a structure that has both a spouted bed and a fluidized bed. The other end of the preheat cement raw material powder supply line 18 having a pushing blower 17 at one end is connected to the side wall of the cone portion 4c formed in the jet fluidized bed granulation furnace 4 configured as described above. An ejector 19 is provided in the middle part of the device, and a raw material powder supply chute 20 vertically extending from the cyclone C ₁ is connected to the ejector 19, and the raw material powder is pushed by the pushing blower 17 into the cone portion 4c. It is configured so that it can be blown and supplied to the formed moving layer b, and the raw material powder blown and supplied is moved to the moving layer b.
Is sufficiently diffused in to reach the local high temperature region a.

[0010]

As described above, according to the structure of the present invention, the following effects can be obtained. (A) By injecting fuel into the vicinity of the central portion just above the dispersion plate having a porous structure and forming a local high temperature region in the central portion directly above the dispersion plate, a spouted bed and a fluidized bed effect are produced in the granulation furnace, and preheating is also performed. By blowing the cement raw material powder from the side wall of the cone part, a downward moving layer is formed on the outer periphery of the local high temperature region, and the raw material powder is sufficiently diffused by the moving layer and reaches the local high temperature region. The throat diameter can be increased without any effort, and the height of the cone can be made constant even if scaled up. (B) In the case of a spouted bed granulation furnace, it is necessary to increase the freeboard height due to scale-up, but in the spouted fluidized bed granulation furnace, the freeboard height may be constant, and the equipment cost is wide. It can be reduced and the economic effect is great. (C) As described above, according to the device of the present invention, it is easy to control the granulated particle size and the product quality is stabilized. In addition, scale-up is easy and equipment costs, heat consumption, and power consumption can be reduced.

[Brief description of drawings]

FIG. 1 is a flow sheet of the device of the present invention.

FIG. 2 is a sectional view of a main part of a spouted bed granulation furnace.

FIG. 3 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

C ₁ Cyclone C ₂ Cyclone C ₃ Cyclone C ₄ Cyclone 1 Suspension preheater 2 Calcination furnace 4 Jet fluidized bed granulation furnace 4 a Freeboard part 4 b Cylindrical part 4 c Cone part 5 Discharge chute 6 L valve 7 Fluidized bed firing furnace 8 Fluidized bed Cooler 9 Packed bed cooler 13 Pulverized coal fuel supply line 14 Heavy oil burner 15 Throat 16 Dispersion plate 17 Push blower 18 Supply line 19 Ejector 20 Raw powder supply chute a Local high temperature area b Downward moving bed

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuji Mukai, 1 Kanda Mitoshiro-cho, Chiyoda-ku, Tokyo Sumitomo Cement Co., Ltd. Cement Co., Ltd. (72) Inventor Isao Hashimoto 1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. Akashi Factory (72) Inventor Mikio Murao 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe, Hyogo Kawasaki Heavy industry Co., Ltd. Kobe factory (72) Inventor Shozo Kanamori 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe city, Hyogo prefecture Kawasaki Heavy industry Co., Ltd., Kobe factory

Claims (1)

[Claims] 1. A cement raw material powder preheated by a preheating means such as a suspension preheater is charged into a granulating furnace, and the granulated material is granulated in a calcining furnace through a discharge chute and then cooled by a cooling means. In the cement clinker manufacturing apparatus for collecting and recovering, a fuel supply means for forming a local high temperature region is arranged near the center directly above the dispersion plate of the perforated plate structure provided in the throat portion between the granulation furnace and the firing furnace. Installed to configure the granulation furnace to have a jet fluidized bed structure, while the granules can form a downward moving bed at a temperature lower than a local high temperature region in the lower part of the jet fluidized bed granulation furnace. Part (cone) is formed, and a means for blowing and supplying preheated cement raw material powder to the moving bed is connected to the side wall of the inverted truncated cone so that the cement raw material powder is sufficiently diffused in the moving bed to reach a local high temperature region. Let it reach Cement clinker manufacturing device characterized by the above.