JPH03279784A - Powder particle cooling device - Google Patents

Abstract

PURPOSE:To provide a cooling device of which initial cost is low, its operation is simple and its cooling efficiency is high by a method wherein several slit-like downstream passages where powder particles automatically flow down and gaseous flow passages crossed at a right angle in a downstream direction with walls of the downstream passages being spaced apart are stored in a housing. CONSTITUTION:Powder particle lime 3 baked in a fluidized bed type baking furnace 1 is fed into a hopper 7 disposed at an upper part of a cooling machine through a shoot 6, distributed into a powder particle passage 12 opened at a discharging side of the hooper and each of the powder particles is discharged out of a system by a discharging machine 20 mounted at the lower end of the passage. Cooling air for each of the cooling chambers 11 is fed from an air inlet port 12 into the cooling chamber 11 and the powder particle lime in the powder particle passage 13 is cooled by a heat exchanging operation while the lime is passing through the air passage 15 disposed at a peripheral surface of each of the powder particle passage 13. The air is heated and fed into the baking furnace as the fluidizing air and combustion air 4 for the baking furnace 1.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] A fired product obtained by firing granular materials such as limestone in a fluidized bed or a spouted bed is cooled, and the cooling gas is heated, and the combustion air of the firing furnace is heated. A cooling device for powder and granular materials designed to be used as a

[Prior Art] A device and method for firing limestone or cement raw materials in a fluidized furnace or a spouted bed, etc. and cooling the fired product in a fluidized cooler are disclosed in JP-A-55-750 or JP-A-Sho. It is disclosed in 62-202844 and the like. All of these cooling devices use a fluidized bed.

FIG. 7 shows an example of this, in which the fired product 3 fluidized in the firing furnace 1 passes through the chute 6, is cooled by a separate fluidized cooling device 21, and is discharged from the discharge port 22. In the fluidized cooling device 21, the fired product 29
is cooled, while the air 26 introduced from the introduction pipe 23
is heated and discharged from the cooler outlet 24, and is transferred to the dust collector 2.
After the fired product was separated by 5, it was blown into the firing furnace 1 etc. by a fan 27 etc. and discharged from the firing furnace outlet 28.

[Problem to be Solved by the Invention 1] When a firing furnace using a fluidized bed and a cooling machine are connected in series as shown in Fig. 7, the pressure loss due to the fluidized bed and the dispersion plate is usually 1. In order to reach approximately OOOmmAq, the pressure of the freeboard of the cooler should be made higher than the pressure of the air chamber of the kiln, or
Alternatively, it is necessary to boost the pressure using a fan or the like.

Therefore, a pressure difference occurs between the firing furnace and the cooling machine, and airflow flows through the chute that connects the two, so in order to prevent this and ensure that only the fired product flows, it is necessary to install a large seal at high temperatures. A device is required, and there is a high possibility that a failure or the like will occur in this part and become a bottleneck.

Furthermore, connecting the fluidized bed in series with one fan requires the use of a fan with higher pressure than the air volume, which limits the types of fans.

Even if a fan is interposed between the two, in addition to the above-mentioned measures, not only will dust collection equipment be required to prevent wear and clogging of the downstream fan and distribution disk of the firing furnace, but also the air from the cooling machine will need to be installed. If the air is taken out from one place, the temperature of the air taken out will be low, but if the cooler is divided into multiple rooms and the high temperature air is taken out, the material of the fan becomes an issue. In other words, the higher the temperature and pressure of the fan itself due to its material, the more expensive it becomes.According to the inventors' experience, the limit for continuous operation of fans made of normal materials is around 350 to 360 degrees Celsius, and it should not be used at temperatures higher than this. In this case, it is necessary to use a special material such as ceramic, which makes the price much higher.

[Means for Solving the Problems] As a result of various studies aimed at solving the above-mentioned problems and developing a cooling device with low initial cost, easy operation, and high cooling efficiency, the present inventors found that We have developed the following bulkhead orthogonal gas-solid heat exchange equipment.

(1) A cooling chamber consisting of a closed box type housing is provided.

(2) A multi-row parallel slit-shaped passage is installed in the cooling chamber, through which the powder and granules naturally flow down from top to bottom.

(3) Provide an air passageway that comes into contact with the outer surface of the powder passageway.

(4) An air inlet for introducing cooling air into the cooling chamber and an air outlet for discharging the air are provided.

(5) A plurality of the cooling chambers are stacked one on top of the other, and the powder passages are communicated with each other.

As the above preferred embodiments, (a) a box-shaped cooling chamber whose vertical cross-sectional shape is a parallelogram is provided;

(b) A plurality of rows of hollow columnar powder passages, which are smaller than the width of the cooling chamber and have a rectangular cross section and are open at the top and bottom, are provided through the cooling chamber in parallel to each side surface.

(c) forming air passages on both long sides between the powder passages;
In addition, partition plates are provided alternately in each row on one side between the powder passage side (short side) surface and the side wall of the cooling chamber so as to form an integrated passage within the cooling chamber.

(d) Cooling air is introduced into the lower corner of the starting end of the air passage.

(e) A cooling air outlet is provided at the upper end corner of the air passage terminal side.

(f) A plurality of the cooling chambers are stacked one on top of the other, and the powder and granules are connected so that the passages communicate with each other.

Furthermore, it is more preferable to add the following configuration to the cooling device configured as described above to improve the cooling efficiency.

(2) The air passage within the cooling chamber is partitioned horizontally or vertically into multiple stages, and a communication port is provided at the end corner of the air passage of the partition plate.

(2) Fin-shaped baffles are arranged in a staggered manner between the long sides of the powder passage or between the walls facing the long sides.

[Effect 1] Since the cooling device of the present invention separates the powder and the gas by a partition wall, there is no need to equalize the pressure between the firing chamber and the cooling device (when used in combination with a fluidized furnace, the combination It's easy.

Furthermore, there is no need for a fan to boost the pressure of high-temperature gas, so there is no problem of fan temperature restrictions.

[Example] Examples of the present invention will be described in detail.

FIG. 1 is a schematic diagram of one embodiment of the cooling device of the present invention. This cooling device is composed of four stacked cooling chambers.

Each cooling chamber 11 has a parallelogram shape in vertical cross section, has a box-shaped housing of 20 x 400 x 2400 mm, and penetrates the ceiling and bottom plate of this housing, and has an upper end and a lower end parallel to the slope of the cooling room. A large number of hollow rectangular columnar powder passages 13 with open external dimensions of 30 x 400 x 2400 mm are arranged in rows at equal intervals, and the gap between the side surface of the powder passage 13 and the inner wall of the housing is separated on one side only for each passage. By alternately closing the openings, an air passage 15 is formed which communicates the cooling air inlet 12 provided at the lower corner of the housing with the outlet 16 provided at the upper corner of the housing.

Each cooling chamber 11(], 1a, llb, 11.c, 1],
In d), four chambers were connected in series so that the powder passage 13 formed a zigzag shape.

Furthermore, a discharger 20 is provided at the lower end of each powder passageway 3 for each passageway.

The air inlet 12 and the fan are connected through an air pipe, and the outlet 16 and the air chamber 2 of the firing furnace 1 are connected.

Powdered quicklime 3 fired in the fluidized firing furnace 1 is introduced into a hopper 7 installed at the top of the cooler through a chute 6. The quicklime in the hopper 7 is distributed to a powder passage 12 that opens to the discharge portion of the hopper, and each powder is discharged out of the system by a discharger 20 installed at the lower end of the passage.

Cooling air in each cooling chamber 11 is introduced into the cooling chamber 11 from an air inlet 12 by a cooling fan provided on the entrance side, and is introduced into the cooling chamber 11 through an air passage 15 provided on the circumferential surface of each powder passage 13. While passing through the air, the quicklime particles in the powder passage 13 are cooled and heated by heat exchange, and the air is introduced into the kiln 1 as fluidizing air and combustion air 4 of the kiln 1.

Section 3 shows an example in which a large number of fin-shaped baffles are arranged in the air passage. Moreover, FIG. 4 shows an example in which the air passage in the cooling room is horizontally partitioned into three stages, and since the air passage 15 can be made longer, the cooling efficiency can be improved. can.

FIG. 6 is a perspective view of an example of the present invention for easy understanding, and FIG. 5 is a plan view thereof.

[Effects of the Invention 1] By using the cooler of the present invention, the following excellent effects are achieved.

Since the high-temperature powder and granules are partitioned in series and cooled down one after another, it is possible to take out only the temperature of the high-temperature combustion air that is required. can be cooled down to low temperatures by itself.

Since the firing furnace and the cooling machine are not directly connected, it is not only possible to control them separately, but there is no need for complicated partitioning devices at the connecting part, so there are fewer breakdowns, etc., and control is easy. .

When a firing furnace is divided into multiple rooms and preheating, firing, sintering, etc. are carried out in a single kiln, it is possible to blow in the required amount of air at different temperatures depending on the situation in each room.

The firing and cooling system can be operated at relatively low pressure, saving power costs.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of an embodiment of the present invention combined with an achievement furnace, Fig. 2 is a plan view of the embodiment, Figs. 3 and 4 are explanatory diagrams of other embodiments, and Fig. 5 is a plan view of the embodiment, No. 6
The figure is a perspective view, and FIG. 7 shows a conventional flow sheet.

Claims (1)

[Scope of Claims] 1. A housing has built-in a large number of slit-shaped flow paths through which powder and granular materials naturally flow down, and a gas flow path through which cooling gas flows perpendicularly to the flow direction across the walls of the flow paths. A powder cooling device featuring: 2. The powder cooling device according to claim 1, further comprising a partition plate that partitions the gas passage into a plurality of upper and lower stages of serial passages. 3. The powder cooling device according to claim 1, further comprising a plurality of wine-shaped baffles protruding from the inner wall surface of the housing and the outer wall of the powder flow path.