JPS58115047A - Powder raw material baking equipment - 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 a fM, 1i7I kiln furnace for producing powder raw materials such as cement or alumina, and a kiln which is installed below this kiln and is fired in the kiln.

This article relates to a powder raw material firing equipment that is equipped with a cooler for cooling hot clinker with air, and a cut-out chute that connects the cooler to the bottom of the firing furnace.

In high-temperature fluidized firing furnaces, powder raw materials often become sticky and granulated, so particle size control is the key to safe operation.

Conventionally, when a continuous flow kiln was operated independently, particle size could be easily controlled by adjusting the wind speed and layer thickness in the fluidized bed. However, in grosses where the fluidized furnace and cold combustor are directly connected, adjusting the wind speed and layer thickness changes the heat recovery profile and temperature of the cooler, and the temperature fluctuations of the sheet firing furnace and the cooler can be easily adjusted. This makes it difficult to control the particle size because it disturbs the sorting operation.

The present invention supplies the exhaust air from the clinker cooler to the unlinker outlet chute and uses it as the air required in the fluidized calcination chute, and also forms a plurality of classification zones with different wind speeds in the chute. By making the chute function as a classifier, the classified particle size can be adjusted over a wide range even at the same air volume, and the particle size can be adjusted within a range while maintaining the in-furnace air velocity and layer pressure at predetermined values. It is an object of the present invention to provide a powder raw material firing equipment that can be controlled and that allows stable continuous rotation of both the firing furnace and the cooler.

For this reason, the present invention provides a plurality of cooler exhausts whose lower ends are connected to a clinker cooler and whose upper ends are connected in the middle of a clinker discharge chute provided between the tail of the fluidized fluidized kiln and the cooler. tact, and the connection position of each upper end of the plurality of cooler exhaust tacts to the clinker discharge chute is arranged above and below so as to form a plurality of classification zones with different wind speeds in series in the clinker discharge chute. It is characterized by being different.

Hereinafter, embodiments of the present invention will be described with reference to Eko.

Fig. 1 shows the first example of the present invention, which shows the fluidized fluidized firing furnace for firing the powder raw materials, 2 the cooler for air cooling the high temperature clinker fired in the firing furnace 1, and 3 the A clinker discharge chute 4, which connects the bottom of the kiln 1 and the cooler 2, is provided at a relatively lower part of the chute and supplies an appropriate amount of clinker in the chute 3 to the cooler 2 while acting as a scum seal. A rotor 2 no feeder, 5 a powder raw material supply device attached to the kiln 1, 6 a kiln burner, 7 a kiln exhaust pipe, 8 a fan for supplying air to the cooler 2, 9 A clinker takeout device takes out the cooled clinker from the cooler. And 10 is the first
The lower end is connected to the cooler 2 and the upper end is connected to the middle of the clinker discharge chute 3 by a cooler exhaust mekto. 11
is the second cooler exhaust tact, which also cools the lower end at 62K.
iti-rI*L, the upper end of which is connected to the clinker discharge chute 3. Moreover, the connection position of the upper end of the brown 1 cooler exhaust tank 10 to the clinker discharge chute 3 is located higher than the connection position of the upper end of the second cooler 4 exhaust tact 11 to the clinker discharge chute 3. Further, 12 is a first K amount adjusting damper provided in the middle of the first cooler exhaust duct 10, and 13 is a second air volume adjusting damper provided in the middle of the second cooler exhaust duct. Furthermore, 14 is a first classification zone formed in the chute 3, and 15 is a second classification zone, which will be described later.

In the powder raw material firing equipment configured as shown in FIG. 1, high-temperature exhaust from a cooler 2 is used as the fluidizing air and hot firing air required in the fluidized fluidized firing furnace 1. That is, the cooling air pressurized by the fan 8 cools the high-temperature clinker in the cooler 2 to reach a high temperature, and the exhaust air flows from the cooler 2 through the first cooler exhaust tact 10 and the second cooler exhaust duct 11. They pass through in parallel and rise inside the clinker discharge chute 3, and are delivered to the fluidized fluidized kiln 1. Therefore, in the clinker discharge chute 3, the high-temperature exhaust gas becomes an upward air current, and when the clinker fired in the fluidized fluidized firing furnace 1 descends in the chute 3, it is classified by the upward air current, so that the clinker discharge chute 3 It also acts as a classifier. Moreover, the tact 1
The connection position of the upper end of 0 to the chute 3 is the tact 11
Since the upper end is located above the connecting position to the chute 3, the air volume in the second classification seam 715 is the air volume flowing through the duct 11, but the air volume in the first classification zone 14 is the same as that described above. It is the sum of the air volumes passing through the ducts 10 and 11, and therefore, the air volume of the ascending air current in the first classification zone 14 is smaller than the air volume of the ascending air current in the second classification sea 715.

Therefore, for example, from the tact 11 to the second classification sheet 71
5, by adjusting the second wind sweetness adjustment tamper 13, etc., so that the wind speed of the second classification seam 715 becomes the target particle fluidization h#3 speed.
While considering the air volume which is changed from 1 to $-1, adjust the air volume supplied from the tact 10 to the first classification zone 14 by adjusting the first air vibration pump 12)/)) , the wind speed of the first classification sea 714 is set to be slightly lower than the terminal velocity of the target particles.

Then, first, the particle group in the fluidized bed of the fluidized firing furnace 1
They fall into the classification zone 14, where the air from the duct 10 crosses the particle group and diffuses them, while most of the microparticles, which are finer than the separation target particles, are carried by the airflow from below and returned to the firing furnace 1. It will be done. That is, since the wind speed of the updraft in the first classification zone is below the terminal velocity of the target particles, the first classification is performed here. At this time, some of the microparticles fall into the second classification zone 15 together with the target particles, but here, the microparticles ride on the updraft whose wind speed is the fluidization start speed and are sure to become the target particles. It is separated into two, pushed up to the first classification zone 14, and returned to the fluidized fluidized kiln 1 on the air current. In other words, in the second classification zone 15? A second classification is performed, and the target particles resulting from this classification can be supplied to the cooler 2.

In addition, the air volume required by the fluidized fluidized firing furnace 1 is satisfied, and
If the passage cross-sectional area of the chute 3 and both exhaust ducts 10 and 11, the capacity of 7778, etc. are designed so as to satisfy the above-mentioned wind speed in each zone 14 and 15, it is not necessary to provide both Dannos ζ 12 and 13. It disappears.

FIG. 2 shows a second embodiment of the present invention.
The only difference from the embodiment is that an overflow chute 16 and a rotary feeder 17 having a gas sealing property are provided, and the rest is completely the same, so a detailed explanation will be omitted.

FIG. 3 shows a third embodiment of the present invention, in which a wind box 18 is provided in the fluidized fluidized firing furnace 1, and the wind box 18 and the cooler 2 are connected to a third embodiment.
The cooler is connected by an exhaust duct 19, and a third air volume adjusting damper 20 is provided in the middle of the duct 19. Therefore, regarding the classification action in the talin force discharge chute 3,
Although it is the same as the first and second embodiments, the amount of air supplied to the fluidized fluidized kiln 1 is the amount of air passing through the exhaust duct 19 in addition to the upward airflow from the clinker discharge chute 3. It will be done.

FIG. 4 shows a fourth embodiment of the present invention.
The embodiment is a portion in which an overflow chute 16 and a rotary feeder 17 having a cassealing property are provided, and the flow passage cross-sectional area of the portion of the clinker discharge chute 3 forming the second classification sea 715 forms the first classification zone 14. The only difference is that it is larger than the cross-sectional area of the flow path. 4. Thus, the present invention provides a plurality of clinker discharge chutes, each of which has its lower end connected to a Tallinn power cooler and whose upper end is connected to the middle of a clinker discharge chute provided between the bottom of the fluidized fluidized kiln and the cooler. A cooler exhaust duct is provided, and the upper end of each of the plurality of cooler exhaust ducts is connected to the clinker discharge duct at a different position in the upper and lower positions, so that a plurality of classifications with different wind speeds are arranged in series in the clinker discharge chute. Since the zone is formed, the chute can function as a classifier and the classified particle size can be adjusted over a wide range even at the same air volume used in a fluidized fluidized furnace, and the air velocity inside the furnace can be adjusted. and layer thickness:
Particle size can be controlled while keeping r constant.
Enables stable operation of both the fluidized kiln and the Tallinn force cooler. In addition, since the classification is performed by the exhaust air from the cooler,
Heat recovery is good, and even if there is a slight change in air volume, there is little effect on the temperature of the fluidized kiln as a disturbance.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG.
FIG. 2 is an elevation view of the second embodiment, FIG. 3 is an elevation view of the third embodiment, and FIG. 4 is an elevation view of the fourth embodiment. 1. Fist/fluidized kiln, 2... Cooler, 3... Clinker discharge chute, 10... Frame 1 Cooler exhaust duct,
11... Second cooler exhaust duct, 14... First classification zone, 15... First classification zone. Patent issuer: Ishikawajima Seibu Lengakuri Public Corporation Inspector 3
Mine 4 town

Claims (1)

[Claims] 1. A fluidized fluidized firing furnace for firing powder raw materials, a cooler installed below this firing furnace to air-cool the high-temperature clinker fired in the firing furnace, and a bottom part of the firing furnace and the cooler. A powder raw material firing equipment equipped with a connected clinker discharge chute, the lower end of which is connected to an air cooler, and the upper end of which is connected in the middle of the clinker discharge chute, and , the connection position of each upper end portion of each of the number MJ cooler exhaust tacts to the clinker discharge chute is at the top so as to form a number of classification zones having different wind speeds in series in the clinker discharge chute. 1. Powder raw material firing equipment that makes % of the difference similar to 1.