JPH0665445U - Coating prevention device for granulation furnace in cement clinker manufacturing device - Google Patents

Abstract

(57) [Summary] [Purpose] In a cement clinker manufacturing device, the occurrence of alkali coating at the exhaust gas outlet of the granulation furnace is prevented. [Structure] A dispersion section 42 is provided at the lower end of the exhaust gas outlet duct 13 of the granulation furnace 12, and a preheating raw material input for introducing the preheat cement raw material powder from the raw material preheating device 10 near the upper side of the dispersion section. Connect the tube 44. As the dispersion unit 42, a perforated plate 42a, a water-cooled pipe type dispersion plate 42b in which a plurality of water-cooled structure pipes 48 are installed in parallel, and two water-cooled structure plates 50 that are opposed to each other with a space 52 therebetween.
c or the like is used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for preventing the occurrence of alkali coating in an exhaust gas outlet of a granulating furnace in a cement clinker manufacturing device.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, as a cement clinker manufacturing apparatus, an apparatus disclosed in Japanese Patent Laid-Open No. 62-230657 is known. As shown in FIG. 8, this apparatus includes a raw material preheating device (suspension preheater) 10 for preheating cement raw material powder, a spouted bed granulation furnace 12 connected to the raw material preheating device for granulating preheated cement raw material powder, It comprises a fluidized bed firing furnace 18 connected to the granulation furnace via an exhaust gas duct 14 and an airtight discharge device 16, and a cooling device 20 connected to the firing furnace to cool the fired product. Numerals 10a, 10b, 10c and 10d are cyclones, 13 is an exhaust gas outlet duct of the granulation furnace, 22 and 24 are flap dampers, 26 is an induction fan, 28 is an airtight exhaust device, 30 is an airtight device, 32 is a pushing fan, 34 Is a burner. A fluidized bed granulation furnace may be provided instead of the spouted bed granulation furnace 12.

[0003]

[Problems to be solved by the device]

 In the method for producing a cement clinker described in the above-mentioned JP-A-62-230657, alkali coating (adhesion of alkali content in cement raw material powder) is generated at the exhaust gas outlet of the granulation furnace 12, and continuous stabilization is achieved. Driving was sometimes hindered. That is, in the granulation furnace 12, the adhered / generated alkaline coating was dropped off, which caused fluidization inhibition and hindered continuous stable operation.

Further, as shown in FIG. 9, a calcination furnace 38 may be installed above the granulation furnace 12 via a calcination furnace throat section 13a, and as shown by a chain line, The preheated raw material powder is put into the calcining furnace 38 from the cyclone 10b, but in this case, the alkali coating 40 is generated in the calcination furnace throat portion 13a.

As a countermeasure against this, as shown by the solid line, the preheated raw material powder is put into the calcination furnace throat part 13a from the cyclone 10b of the raw material preheating device to lower the temperature of the exhaust gas of the granulation furnace. The raw material powder was not sufficiently diffused in the calcination furnace throat section 13a, the exhaust gas temperature could not be uniformly lowered in the throat section 13a, and alkaline coating still occurred in the throat section 13a.

The present invention has been made in consideration of the fact that if the temperature of the exhaust gas from the granulation furnace is uniformly lowered to 900 ° C. or lower, the alkali coating can be prevented. The purpose of the present invention is to install a dispersion section at the lower end of the exhaust gas outlet duct of the granulation furnace, and to feed the raw material powder from the raw material preheating device to the lower end of the granulation furnace exhaust gas duct and to just above the dispersion section. It is an object of the present invention to provide an apparatus which prevents the occurrence of alkali coating by dropping the material, diffusing the raw material powder throughout the duct, and instantly and uniformly lowering the temperature of the granulation furnace exhaust gas.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, as shown in the drawings, the coating preventing device of the granulating furnace in the cement clinker manufacturing device of the present invention is provided with a raw material preheating device 10 for preheating cement raw material powder and this raw material preheating device. In a cement clinker manufacturing apparatus equipped with a granulating furnace 12 connected to granulate the preheated cement raw material powder, a calcining furnace 18 connected to the granulating furnace, and a cooling device 20 connected to the calcining furnace, A dispersing section 42 is provided at the lower end of the exhaust gas outlet duct 13 of the granulating furnace 12, and a preheating raw material feeding pipe 44 for feeding the preheating cement raw material powder from the raw material preheating device 10 is connected near the upper side of the dispersing section 42. Is configured. In the specification of the present application, the exhaust gas outlet duct of the granulation furnace 12 also includes a calcination furnace throat section.

As shown in FIGS. 1 and 2, the dispersion section 42 is a perforated plate 42 a, or as shown in FIGS. 3 to 5, a plurality of water-cooled pipes 48 are installed in parallel, and Also, as shown in FIG. 7, two plates 50 having a water-cooled structure are placed opposite to each other with a space 52 therebetween.

[0009]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, unless otherwise specified, the shapes and relative arrangements of the constituent devices described in this embodiment are not intended to limit the scope of the present invention to them, and are merely explanatory examples. Nothing more. Example 1 In this example, as shown in FIGS. 1 and 2, an exhaust gas outlet duct of the granulation furnace 12, that is, a dispersion section 42 was provided at the lower end of the calcination furnace throat section 13a. A preheating raw material charging pipe 44 or a charging chute for charging the preheating raw material powder from the raw material preheating device is connected near the upper side of the portion 42. In this embodiment, the dispersion section 42 is composed of a perforated plate 42a having a large number of holes 46.

The preheating raw material of about 700 ° C., which is fed from the preheating raw material feeding pipe 44, drops to just above the dispersion portion 42 at the lower end portion of the calcination furnace throat portion 13a and diffuses throughout the throat portion 13a. By contacting the granulation furnace exhaust gas at around 1200 ° C, the exhaust gas temperature is instantly and uniformly lowered to 900 ° C or lower.

Embodiment 2 In this embodiment, as shown in FIGS. 3 to 5, a dispersion section 42 and a water-cooled pipe type dispersion plate 42 b constituted by installing a plurality of pipes 48 having a water-cooled structure in parallel with each other. It was done. As shown in FIG. 5, the water cooling pipe 48 has a double pipe structure, so that the water cooling pipe 48 can be extracted. Therefore, in this case, even if coating occurs on the surface of the water cooling pipe 48 and the dispersion portion is clogged, the coating can be easily removed. Other configurations and operations are similar to those of the first embodiment.

Embodiment 3 In this embodiment, as shown in FIG. 6 and FIG. 7, a water-cooling type dispersion constituted by disposing a dispersion portion 42 with two plates 50 having a water-cooling structure spaced apart by a space 52. The plate 42c is used. The water-cooled plate 50 is hollow and has a partition plate 54 inside. The present embodiment is applied to a case where a raw material preheating device is connected to the granulation furnace exhaust gas outlet without a calcination furnace. Other configurations and operations are similar to those of the first embodiment.

[0013]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. (1) Since the dispersion part is provided at the lower end of the exhaust gas outlet duct (including the calcination furnace throat part) of the granulation furnace, even if the throat (duct) flow velocity is reduced to, for example, 25 m / sec or less, The preheated raw material from the raw material preheating device that is put into the throat part floats in the exhaust gas without falling to the freeboard part of the granulation furnace. In particular, when the gas flow velocity in the throat part is reduced, the raw material powder does not blow through to the upper calcining furnace or exhaust gas duct, the raw material diffuses and accumulates in the throat part, and the exhaust gas in the throat part cools uniformly. To do. (2) As a result, the exhaust gas from the granulation furnace passes through the temperature range where alkaline coating is likely to occur rapidly and instantaneously, and the exhaust gas is cooled to a temperature range where alkaline coating is less likely to occur at the throat. Moreover, since the exhaust gas temperature in the throat part is uniform, alkali coating is avoided as much as possible, and continuous operation is possible.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an embodiment of a coating preventing device for a granulating furnace in a cement clinker manufacturing device of the present invention.

2 is an enlarged sectional view taken along line 2-2 in FIG.

FIG. 3 is a sectional view showing another embodiment of the device of the present invention.

FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG.

5 is a cross-sectional explanatory view of the water cooling pipe in FIG.

FIG. 6 is an explanatory sectional view showing still another embodiment of the device of the present invention.

7 is an enlarged sectional view taken along line 7-7 in FIG.

FIG. 8 is an explanatory view showing a conventional cement clinker manufacturing apparatus.

9 is a cross-sectional explanatory view showing another example around the granulating furnace in FIG.

[Explanation of symbols]

 10 Raw Material Preheating Device 12 Granulation Furnace 13 Exhaust Gas Duct 13a Calcining Furnace Throat 18 Firing Furnace 20 Cooling Device 38 Calcining Furnace 42 Dispersion Part 42a Perforated Plate 42b Water Cooled Pipe Dispersion Plate 42c Water Cooled Dispersion Plate 44 Preheating Raw Material Input Pipe 48 Water-cooled pipe 50 Water-cooled plate 52 Space

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 13, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

[Figure 9]

[Procedure amendment]

[Submission date] November 19, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 9]

[Figure 8]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Katonori Kumagai 1-1 Kawasaki-cho, Akashi-shi, Hyogo Prefecture Kawasaki Heavy Industries Ltd. Akashi factory (72) Creator Katsuji Mukai 1-Kanda Mitoshiro-cho, Chiyoda-ku, Tokyo Sumitomo Within Cement Co., Ltd. (72) Inventor Toshiyuki Ishibachi, 1 Mitodai-cho, Kanda, Chiyoda-ku, Tokyo Sumitomo Cement Co., Ltd.

Claims (4)

[Scope of utility model registration request] 1. A raw material preheating device (10) for preheating cement raw material powder, a granulating furnace (12) connected to this raw material preheating device for granulating preheated cement raw material powder, and connected to this granulating furnace. In a cement clinker manufacturing apparatus equipped with a calcination furnace (18) and a cooling device (20) connected to the calcination furnace, a dispersion section (42) is provided at a lower end portion of an exhaust gas outlet duct (13) of a granulation furnace (12). ) Is provided, and a preheating raw material feeding pipe (44) for feeding the preheating cement raw material powder from the raw material preheating device (10) is connected in the vicinity of the upper side of the dispersion section, and a cement clinker manufacturing apparatus characterized by the above Coating prevention device for granulation furnace. 2. The coating preventing apparatus for a granulating furnace in a cement clinker manufacturing apparatus according to claim 1, wherein the dispersing section is composed of a perforated plate (42a). 3. The pipe (4) having a plurality of water cooling structures, wherein
8. The coating preventing device for a granulating furnace in a cement clinker manufacturing device according to claim 1, wherein the devices 8) are installed in parallel. 4. A water-cooled plate (50) having two dispersion portions.
2. The coating preventing device for a granulating furnace in a cement clinker manufacturing device according to claim 1, wherein the devices are opposed to each other at intervals (52).