JPS6361879A - Jet layer furnace - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to, for example, a spouted bed furnace in which a plurality of spouted beds are formed for granulating cement raw material powder.

[Prior art 1] Conventionally, a spouted bed furnace for producing granules by granulating cement raw material powder has a cylindrical throat tube 1 and a throat tube 1, as shown in Fig. 4. It is composed of an inverted conical enlarged part 2 communicating with the pipe 1 and a cylindrical body part 3 communicating with the enlarged part 2. The high-pressure combustion air G1 from 1) causes the granules to remain suspended in the enlarged part 2, and is melted and granulated by the combustion heat of the 8-s 7, so that the granules P2 are discharged from the discharge chute 5. (For example, see Japanese Patent Application No. 61-48765)
.

[Problems to be Solved by the Invention] However, in the above-mentioned prior art, in order to increase the amount of granulation per unit time, it is necessary to operate multiple spouted bed furnaces side by side and at the same time, or to increase the amount of granulation per unit time. It is necessary to increase the capacity of the cement raw material powder P1 by increasing the size of the cement powder P1.

Here, when a plurality of spouted bed furnaces are used, since the spouted bed furnace has a cylindrical shape, there is a problem that the installation space for the furnace is significantly expanded and the equipment cost is also increased.

Furthermore, when enlarging the entire spouted bed furnace, the pressure loss of the combustion air G1 increases. In other words, in a normal spray bed furnace, the wind speed of the flue gas G2 in the body 3 and the enlarged part 2 are
The inner diameters d and D of the throat pipe 1 and the body portion 3 are set relatively so that the residence time of the cement raw material powder Pl in the throat tube 1 and the body portion 3 are approximately constant. In order to maintain this relative relationship, the inner diameters d and D are increased to make the entire spouted bed furnace larger, generally D3 or A3 (A = cement raw powder P
The amount of granulation per unit volume of granulation increases in proportion to At this time, the pressure loss of the combustion air Gl in the spouted bed 8 also increases in proportion to the increase in the layer heat H. For this reason, the blower that supplies the combustion air G1 needs to have a large output and a large air volume, leading to waste of power consumption and a problem that it is impossible to reduce the operating cost W1.

This invention was made in order to solve the above-mentioned conventional problems, and its purpose is to provide a spouted bed furnace that is small, low cost, and capable of increasing the granulation rate of powder and granules. do.

[Means for solving the problem] The spouted bed reactor according to the present invention has straight lines with straight lines at predetermined intervals.
A plurality of throat pipes are arranged in the upper part and introduce combustion air from below, a single enlarged part that communicates with the outlet of these throat pipes and spreads upward, and is connected to the -E part of this enlarged part. and a single body. - The enlarged part and the body are formed into a substantially rectangular planar shape that extends along the straight line described in (1) above, and the cross section of the main part of the arrangement perpendicular to the straight line expands upward. It is formed into a tapered shape.

[Operation] According to the present invention, a multi-spouted bed structure is adopted in which a plurality of throat pipes are connected to an enlarged part having a tapered cross section, so that a large amount of cement raw material powder can be granulated while being dispersed on each throat pipe. can be done. Thereby, the amount of granulation per unit area can be significantly increased. In addition, by increasing the horizontal length of the body and increasing the number of throat pipes according to the input capacity of cement raw material powder,
It is possible to prevent the layer thickness of the spouted layer from increasing. This results in
Pressure loss of combustion air in the spouted bed is kept small. Furthermore, since the planar shape of the body and the enlarged portion is rectangular, and the structure is such that the body and the enlarged portion are shared by a plurality of throat pipes, the entire furnace is small. The structure is also simplified.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the spouted bed furnace according to the present invention. This is the main body of the spouted bed furnace.

A plurality of throat pipes 10 extend in the vertical direction, and are arranged at regular intervals on a horizontal straight line M. The inner diameters d (see FIG. 3) of the throat pipes 10 are set to be the same so that the high-pressure combustion air G1 from the fluidized bed firing furnace 11 is uniformly introduced into each of the throat pipes 10. It has become.

The spouted bed furnace main body 12 consists of a single enlarged part 13 connected to each of the throat pipes 10 and a single body part 14 connected to the upper part of this enlarged part 13. The portion 14 has a rectangular planar shape extending along the straight line M, as shown in FIG.

The enlarged portion 13 includes a rectangular bottom portion 13a and a peripheral wall portion 13b continuous with the peripheral edge of the bottom portion 13a. Bottom part 13a
A communication hole 15 communicating with the outlet 10a (see FIG. 1) of each of the throat pipes 10 is formed therein. Further, the cross section of the peripheral wall portion 13b perpendicular to the straight line M is formed in a tapered shape that widens upward as shown in FIG. 3, and the tapered space 1 regulated by the peripheral wall portion L3b.
6 communicates with a supply passage 17 for combustion air G1 via a throat pipe 10. In addition, 18 is a combustion burner, which branches from the fuel supply pipe 19 in FIG.
3 at a position corresponding to each throat pipe 10 at the lower end thereof.

The torso 14 has its @statement 1. Height 2 is constant, length 3
is set according to the increase in the granulation capacity of the spouted bed furnace (granulation amount per unit time of cement raw powder P1), and thereby,
The layer thickness H (FIG. 3) of the spouted bed furnace 20 in the tapered space 16 is prevented from increasing. As shown in FIG. 2, one side wall 14a of this body 14 is provided with four charging chutes 21 for charging cement raw material powder P1 at regular intervals in the length direction of the body 14, and the other side wall 14b is provided with a discharge chute 22 for discharging the granules P2.

In the above configuration, the spouted bed furnace shown in FIG. 1 has a multi-spouted bed structure having a plurality of throat pipes 10, and high-pressure combustion air G1 preheated in the fluidized bed firing furnace 11 is supplied from below each throat pipe 10. Since the powder is fed in, a large jet is applied to each of the cement raw material powders P1 that are individually introduced from the input chute 21. At this time, the cement raw material powder P1 is partially melted by the combustion heat of the burner 18 and granulated while remaining in a suspended state within the enlarged portion 13 and the body portion 14. Then, the granules P2 are discharged from the discharge chute 2
After that, it is discharged from the cement clinker 2 and then taken out as a product (cement clinker) through a firing and cooling process. Here, since a plurality of throat pipes 10 are connected to the enlarged part 13 having a tapered cross section, a large amount of cement raw material powder P
1 can be granulated while being dispersed onto each throat pipe 10. Thereby, the amount of granulation per unit time can be increased. In other words, the same effect as when using a plurality of conventional cylindrical spouted bed furnaces can be obtained.

Further, by setting the length of the body 14 or 3 to be large in accordance with the increase in the input capacity of the cement raw material powder P1, it is possible to prevent the layer thickness H of the spouted bed 20 from increasing. therefore,
Since the pressure loss of the combustion air in the spouted bed 20 can be suppressed, it is possible to eliminate wasteful power consumption of the blower that supplies the combustion air, and to reduce operating costs.

Furthermore, since a plurality of throat pipes 10 share a single enlarged portion 13 and body portion 14, the structure is simplified and manufacturing is facilitated. In addition, since the plane of the body 14 is rectangular, compared to the case where a plurality of conventional spouted bed furnaces with a circular plane (diameter of the body 1) are arranged in a straight line,
Even if the sentences 3 have the same length, their horizontal cross-sectional areas are small.

Therefore, if the granulation capacity is the same, the spouted bed furnace of this invention, which is equipped with the enlarged part 13 and the body part 14 whose planes are rectangular, has a smaller length 3 and can be made smaller accordingly. become.

Further, since the plurality of throat pipes 10 are arranged in series, the burner 18 can be easily arranged in each throat pipe 10, and the practicality is improved.

In the above embodiment, one spouted bed furnace main body 12 consisting of a single enlarged part 13 and a single body part 14 was used, but the invention is not limited to this, and a plurality of spouted bed furnace main bodies 12 are prepared, and each spouted bed furnace A plurality of throat pipes 10 may be connected to the main body 12.

The throat pipe 10. number of burners 18, and cement)
The number and position of the input shoes 1-21 for the U powder P1 and the discharge chutes 22 for the granulated material P2 are not limited to those in the above embodiment.

[Effects of the Invention] As explained above, according to the present invention, since the spouted bed furnace has a multi-spouted bed structure having a plurality of throats, the granulation speed of powder and granules can be increased, and productivity can be improved. You can improve your performance. Further, since the pressure loss of the combustion air in the spouted bed is suppressed to a small level, wasteful power consumption of the blower can be eliminated and operating costs can be reduced. Furthermore, since the planar shape of the body is rectangular and the structure is such that multiple throat pipes share the body and the enlarged part, the entire furnace is compact and has a simple structure.
Installation space can be reduced. Furthermore, since the throat pipe is arranged in a straight line, there is an effect that the burner can be easily disposed on the throat pipe.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an embodiment of this invention, Figure 2 is a cross-sectional view taken along section line ■-H in Figure 1, and Figure 3 is a cross-sectional view taken along section line ■--■ in Figure 1. FIG. 4 is a longitudinal sectional view showing a conventional spouted bed furnace. 10... Throat pipe, 10a... Outlet, 13...
Enlarged part, 14... body part, 18... burner, 20...
・Spouted bed, G1...Air for combustion.

Claims (1)

[Claims] (1) A plurality of throat pipes arranged in a horizontal straight line at predetermined intervals and introducing combustion air from below, a single enlarged portion communicating with the outlet of these throat pipes and expanding upward, and this enlargement. a single body connected to the upper part of the enlarged part, the enlarged part and the body have a substantially rectangular planar shape extending along the straight line, and a cross section of the enlarged part perpendicular to the straight line; A spouted bed furnace is formed in a tapered shape that widens upward.