JPS598651A - Burned mass cooling device - 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 an improvement in a cooling device for baked ingots such as cement clinker baked in a kiln.

A device shown in FIG. 1 has conventionally been used as a cooling device for baked ingots. A high-temperature baked ingot 3 such as cement clinker baked in a kiln 2 such as a rotary kiln is charged into this cooling device 1, and is transported in the direction of the arrow 5 by a reciprocating lattice conveyor 4 having a reciprocating lattice. transported to. During this conveyance, a cooling medium 6 such as air is supplied from the lower surface of the reciprocating lattice-type conveyor 4 through ventilation holes (not shown) bored in each lattice 4a and between the lattices, and the baked ingots 3 are being conveyed. is cooled.

The baked ingots 3 that have been completely cooled are discharged through the grizzly 8 at the discharge lower, and the ones that cannot pass through the grids of the grizzly 8 are discharged through the clinker breaker 9.
Clinker is crushed and discharged as clinker with uniform particle size.

On the other hand, the cooling medium that has been heat exchanged with the baked ingot 3 becomes high-temperature air, a part of which 6a is used as combustion air in the kiln 2, and another part 6b is used to preheat the cement raw material to be input into the kiln 2. It is used as combustion air or a preheating medium in a device (not shown), and the remaining portion 6c is removed from dust and released into the atmosphere.

By the way, since the cooling medium is supplied from the lower surface of the grid 4a, the temperature difference in the upper layer of the baked ingot from the cooling medium heated in the lower layer becomes small, and the degree of cooling in the upper layer becomes low. Therefore, a temperature gradient occurs between the lower layer and the lower layer, which is relatively well cooled, making it impossible to obtain a high cooling effect as a whole. In addition, the NSP cooling system has a large capacity, so the cooling system itself is also large, but the dispersion of a large amount of baked ingots on the grid is not good in the sun setting area where it is fed from the firing furnace to the cooling system. As a result, there is a drawback that the refrigeration assembly equipment must be made longer to achieve the desired cooling.

In order to solve this problem, reciprocating lattice type I transport bodies (not shown) are arranged in the lower two stages, and the baked ingots that have been unevenly cooled by the upper transport member are mixedly loaded on the lower transport member. It has been proposed that the lower stage as well as the upper stage can be cooled by a cooling medium supplied from below while being conveyed.

However, in such a cooling device, it is currently not considered that the thermal energy possessed by the cooling medium whose temperature has been raised by heat exchange with the baked ingots can be sufficiently recovered and utilized.

The present invention was made in order to solve the above-mentioned problems, and it is possible to achieve miniaturization with a small lattice area, complete and uniform cooling of baked ingots, and furthermore, it is possible to increase the temperature by heat exchange. It is an object of the present invention to provide a cooling device for baked ingots that can effectively recover and utilize thermal energy of a cooling medium.

The feature is that appropriate partitions and walls are provided on the lower surfaces of the upper and lower moving floors along the transport direction.
This is a cooling device for baked ingots that has an air supply chamber that introduces a cooling medium at a temperature that corresponds to the degree of cooling of the baked ingots.Furthermore, in addition to the above configuration, an upper chamber on an upper movable bed is provided. It is separated into two chambers in the conveyance direction, and is equipped with a heat exchange device that recovers heat by extracting the heated cooling medium from the upper chamber on the downstream side, and supplies the recovered cooling medium to one of the pre-distribution air chambers. This is a cooling device for baked ingots that have a trachea.

Hereinafter, the present invention will be explained in detail based on examples thereof.

FIG. 2 shows a cooling device 10 for baked ingots, which is an embodiment of the present invention.
FIG.

This consists of an upper moving bed 12 that cools and transports the high-temperature baked ingots 3 from the firing furnace 11, and a lower moving bed that cools and transports the baked ingots 3 transferred from the upper moving bed 12 via an airtight discharge type storage hopper 13. Partition walls 12a and 14a are appropriately provided on the lower surfaces of the upper moving floor 12 and the lower moving floor 14 along the conveyance direction. These partition walls form air supply chambers 15 and 16 into which a cooling medium having a temperature corresponding to the degree of cooling of the baked ingot 3 is introduced.

The upper moving bed 12 and the lower moving bed 14 are reciprocating grid-type conveyors, and are driven by a known method employed in this field. Incidentally, since the baked ingots No. 3 and 1 on the lower movable bed 147 are in a somewhat cooled state, a conveyor-like lattice-type conveyor as shown in FIG. 5 may be used. Moreover, these conveyors may be inclined in the conveyance direction as necessary.

An upper chamber 17 is formed in the space above the upper movable bed 12 for supplying and exhausting the heated cooling medium to the firing furnace 11, a preheating device (not shown), etc. as combustion air. An overpartition 18 is provided around the middle to separate the chambers into two chambers 17a and 17b.

Note that this overpartition 18 does not necessarily have to be provided, but if it is provided, the two chambers can be kept airtight from each other by the baked ingots 3 being transported, and the The heated cooling medium can be appropriately separated for use and exhaust.

The airtight discharge type storage hopper 13 temporarily stores the baked ingots 3 that have been cooled and transported by the upper moving bed 12, and stores the baked ingots 3 that have different degrees of cooling due to being layered on the upper moving bed 12. It has the function of equalizing the temperature of the sintered ingots 3 and preventing short paths of the cooling medium between the upper chamber 17 and the lower chamber 19 above the lower moving bed 14 due to the accumulated baked ingots 3.

In this storage hopper 13, a grizzly 8 and a clinker breaker 9 are provided, and the baked ingots with small grain size pass through the grizzly 8 and fall, and the baked ingots with large grain size reach the breaker 9 and are crushed. They are mixed and stored below.

As shown in the figure, for example, three air supply chambers 15 are successively installed at locations corresponding to the upper chamber 17a, and coolant at room temperature is supplied to each of them independently.

This cooling medium exchanges heat with the baked ingot 3 which is in the highest temperature state, and is supplied to the firing furnace 11 and the preheating device through the thin opening 20 and the bleed port 21, respectively. If the air supply chambers are provided independently in the conveying direction in this way, the wind pressure and air volume of the cooling medium can be appropriately selected and supplied depending on the layered state of the baked ingots being conveyed.

On the other hand, the cooling medium at room temperature is also supplied to the air supply chamber 16 of the lower moving bed 14, and after cooling the baked ingots 3, it passes through the lower chamber 19 and reaches the upper moving bed 12, where it is transferred to the upper chamber 1 downstream in the conveyance direction.
7 The baked ingots 3 on the b side are cooled and discharged from the exhaust pipe 22.

As can be seen from the above description of the configuration, the present invention provides a firing furnace 1.
The high-temperature baked ingots 3 supplied from 1 are conveyed on the upper moving bed 12 while being rapidly cooled by a cooling medium at room temperature from the air supply chamber 15, and then transferred to the upper moving bed 1 on the side of the upper room 17b.
2, the baked ingots 3 on the lower moving bed 14 are cooled and further cooled to about 300 to 350°C by the cooling medium whose temperature has been raised.

At this time, the cooling medium from the air supply chamber 15 reaches a high temperature, passes from the upper chamber 17a through the thin opening 20 and the air bleed port 21, and is used as combustion air as described above.

Note that since the cooling medium from the air supply chamber 15 is at room temperature, the temperature of the high-temperature baked ingot 3 can be lowered rapidly, and high-quality clinker can be obtained.

The baked ingots 3 that have reached the storage hopper 13 are sieved by a grease 8, and those with a large particle size are crushed by a clinker breaker 9 to make the particle size uniform. And the upper moving floor 12
The baked ingots 3, which have different degrees of cooling due to the formation of layers on top, are dispersed and mixed in the storage hopper 13, and as a result, the baked ingots 3 exchange heat with each other and are made uniform in temperature.

The discharge port 13a of the storage hopper 13 is made airtight by the baked ingots 3 retained in the storage hopper 13, and the cooling medium is not communicated between the upper chamber 17 and the lower chamber 19 via the storage hopper 13.

Therefore, the cooling medium in the lower chamber 19 is always sent to the upper chamber 17 only through the grid of the upper moving bed 12.

The temperature of the baked ingots 3 transferred from the storage hopper 13 to the lower moving bed 14 has been considerably lowered, but while being conveyed on the lower moving bed 14, it is cooled to 110 by the cooling medium at room temperature from the air supply chamber 16.
The product is cooled to about 150° C. and discharged as a product from the airtight discharge port 23 of the cooling device 10.

The temperature of the baked ingots 3 on the lower moving bed 14 is increased by cooling the baked ingots 3. The cooling medium passes through the grid downstream in the transport direction of the upper moving bed 12 where the air supply chamber 15 does not exist, and then cools the baked ingots 3 located in the upper chamber 17b. As described above, the gas is cooled and discharged through the exhaust pipe 22.

Incidentally, among the high-temperature baked ingots that fall from between the grids of the upper movable bed 12, those in the upper chamber 17a fall into the air supply chamber 15 as shown in FIG. 3, and are separated by a damper 15a. The materials in the upper chamber 17b fall directly onto the lower moving bed 14'' and are cooled there.

The low-temperature baked ingots that have fallen from between the grids of the lower movable bed 14 are transferred to a spillage conveyor 2 provided at the bottom of the lower chamber 16.
It is carried out by 4.

In this way, the baked ingots 3 are heated by the upper movable bed 12 and the lower movable bed 14 provided in two stages! Since the clinker is uniformly cooled and rapidly cooled in the area where the air supply chamber 15 is located, high quality clinker can be obtained.

FIG. 4 shows an embodiment of a cooling device 30 for baked ingots according to a different invention.

Components that are not different from those of the above-described invention are designated by the same reference numerals, and description thereof will be omitted.

The present invention connects a heat exchange device 31 to the upper chamber 17b of the apparatus of the invention, recovers the thermal energy of the cooling medium heated through the heat exchange device 31, and
The cooling medium whose temperature was lowered in step 1 is circulated through an appropriate number of air supply chambers,
This increases the utilization of cooling medium.

To be more specific, the heat exchange device 31 is a waste heat boiler that is installed via a dust collector 32 such as Multichron connected to the exhaust stack 22, and a part of the cooling medium whose temperature has been lowered by the heat exchange device 31 is is discharged to the atmosphere through an electric precipitator 33, etc., and the others are pressurized by blowers 34, 35 and supplied to air chambers 15C, 16A, and 16B via air pipes 36, 37.

On the other hand, the energy recovered by the heat exchange device 31 is converted into electric power or the like within the plant and used separately.

According to the cooling device 30 having such a configuration, a cooling medium at room temperature is supplied from the air supply chambers 15A and 15B to the part where the high temperature baked ingot 3 is located, and rapidly cools the baked ingot 3. The heat-recovered cooling medium supplied to the air supply chamber 15G provided on the downstream side of the upper chamber 1.72 via the air supply pipe 36 further cools the baked ingots 3. Although the cooling medium from the air supply chamber 15C has been heat-recovered, its temperature is higher than that of the cooling medium at room temperature, but since the baked ingots 3 on the air supply chamber 15C are still at a fairly high temperature, it is not used as a cooling medium. Fully functional.

In addition, in order to increase the heat recovery rate by the heat exchange device 31,
The layer thickness of the baked ingot near the thin part may be made higher than that in the downstream part by partially changing the speed of the reciprocating motion of the grid. Therefore, the pressure loss in the baked ingot layer increases, and a cooling medium with a high pressure increase is required to ensure a constant flow rate, so the air supply chamber 15 is separated as described above. and the cooling medium supply can be adjusted individually.

In addition, the cooling medium after heat recovery that is supplied to the air supply chambers 16A and 16B provided on the lower surface of the upstream side of the lower moving bed 14 via the air supply pipe 37 functions similarly to the above, and this is The downstream baked ingots supplied from the air chambers 16C and 116D are mixed with a cooling medium at room temperature in the lower chamber 19, and after cooling the baked ingots 3 in the upper chamber 17b, they are sent to the heat exchange device 31 described above. .

Therefore, the thermal energy possessed by the cooling medium can be recovered by the heat exchange device and used separately, and the cooling medium whose temperature has been lowered can be effectively used at locations corresponding to the degree of cooling of the baked ingot 3. can.

FIG. 5 shows a cooling device 4o of a different embodiment.

The difference from the previous embodiment is that air supply chambers 15A to 15B are provided over the entire length of the lower surface of the upper movable bed 12, and the lower movable bed 1
4 is a conveyor-like lattice conveyor, and the lower chamber 19 is provided with an appropriate number of exhaust ports 41 for discharging the cooling medium that has cooled the baked ingots 3 on the lower moving bed 14.

Although the number of air supply chambers 15A to 15E under the upper moving bed 12 is not limited to five, if they are also provided under the upper chamber 17b, the cooling medium whose temperature has been lowered by the heat exchange device 31 can be introduced. It is also possible to introduce the cooling medium 4 into the lower chamber 19 as appropriate.

Further, the cooling medium whose temperature has been lowered can also be circulated to the air supply chamber 16A below the lower moving bed 14.

The lower movable bed 14 may be a reciprocating lattice-type conveyor similar to the upper movable bed 12, but since the temperature of the baked ingots 3 cooled there has already dropped considerably, a conhair-like lattice type conveyor having poor heat resistance may be used. It can also be used as a carrier. 1. There is no relative movement between the baked ingots 3 on this conveyor-like lattice conveyor. Not only can the life of the conveyor be extended with less wear, but also the entrance side 14a of the conhair-shaped lattice-type conveyor can be inclined when transferred from the storage hopper 13, and the baked ingots 3 can be It is convenient because it can be uniformly dispersed using a grid.

When this conveyor is adopted, a protective cover 42 is provided on the grid on the return side as shown in FIG. 6, and the falling baked ingots 3 are guided from both sides to the spillage container hair 24. good.

It goes without saying that if there is no problem with heat resistance, a conhair-shaped lattice conveyor may be applied to the upper movable bed 12.

According to such a configuration, the air supply chamber 1 below the upper moving floor 12
A cooling medium at room temperature is supplied to 5A to i5B, and the high temperature baked ingot 3 is rapidly cooled. In addition, the cooling medium for reducing the temperature in the heat exchange device 31 from the air supply pipe 43 or the cooling medium for the lower chamber 19 from the air supply pipe 44 is supplied to the air supply chamber 1.5C, whereby the baked ingot on the air supply chamber 15c is supplied. Refrigerate Item 3 further.

The temperature-raising cooling medium that has reached the -E stage chamber 17a is supplied to the firing furnace and the like through the droplet 20 and the bleed port 21 as described above.

In the downstream part of the upper moving bed 12, the exhaust port 41 of the lower chamber 19 is connected to the air supply chambers 15D and 15E with the cooling medium pressurized by the old blower 45 or with it a heat exchange device 31 (not shown).
The cooling medium whose temperature has been lowered is supplied via the air pipes 46 and 47, and the cooling medium whose temperature has been raised by cooling the baked ingots 3 is supplied to the upper chamber 1.
7a and 17b, respectively, a firing furnace, a preheating device,
It is discharged to the heat exchange device 31. In addition, air supply chamber 15.15
When it is desired to change the pressure of the cooling medium supplied to the air pipes 43, 44, 46, and 15B according to the temperature and layer of the ground material 3, the damper 48 interposed in the air pipe 43, 44, 46, 47 is used as appropriate. Pressure can be adjusted.

In the storage hopper 13, the same processing as in the previous embodiment is performed, and the baked ingots 3 are transferred to the lower moving bed 14. Air supply chamber 16
The baked ingot 3 on A is pressurized by the blower 35 and cooled by a cooling medium supplied through the air pipe 49. Then, the downstream baked ingot 3 is finally cooled by the room temperature cooling medium supplied to the air supply chamber 16B. As described above, this cooling medium is reused through the outlet 4I of the lower chamber 19 together with that from the air supply chamber 16A.

In this way, by appropriately supplying and circulating cooling media with different temperatures depending on the temperature at the conveyance position of the baked ingots, not only the cooling medium can be used for cooling, but also the thermal energy held by the cooling medium can be effectively utilized on the other side. be able to.

As explained in detail in 1-1 below, the present invention uses a two-stage conveyor to lengthen the distance for cooling and conveying the baked ingots through an airtight storage hopper. It is shorter than a cooling device, and the installation area can be halved.

In addition, since the baked ingots are unevenly cooled at high temperatures, they are distributed and mixed in the storage hopper to equalize the temperature, and then further cooled in the lower moving bed, so that desired cooling can be achieved.

In addition, since air supply chambers are provided for each of the upper moving bed and the lower moving bed, it is possible to supply a cooling medium according to the temperature of the baked ingots, and it is possible to produce high quality clinker and the like.

Furthermore, in the latter invention, a heat exchange device is installed to recover heat from the heated cooling medium, so that the dissipated energy can be recovered and used separately, and the cooled cooling medium can be circulated. By doing so, the baked ingot can be cooled according to the degree of cooling. In addition, since it can also be supplied as combustion air to a kiln or the like as in the past, it is possible to provide a cooling device for baked ingots with high thermal efficiency as a whole.

8

[Brief explanation of drawings]

Fig. 1 is a conventional cooling device for baked ingots, Fig. 2 is an embodiment of the cooling device of the present invention, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, and Fig. 4 is an embodiment of a different invention. , FIG. 5 is a different embodiment thereof, and FIG. 6 is a sectional view taken along the line IV-1'V in FIG. 3-・Baked ingot, 1O130,40-・-Cooling device, 11
- firing furnace, 12- upper moving bed, 13-.- storage hopper,
14--Lower moving floor, 14a--Partition wall, 15.16
- Air supply chamber, 17- Upper chamber, 31- Heat exchange device, 36.
37.43.44.46.47 - Air pipe patent applicant
Kawasaki City - E-gyo Co., Ltd. Agent Patent Attorney Katsutoshi Yoshiyoshi (
Idiot 1) 9 Procedural amendment (voluntary) 26 Name of the invention Cooling device for baked ingots 3 Relationship with the case by the person making the amendment Name of patent applicant Name (097) Kenhiro Hasegawa, representative of Kawasaki City Industrial Co., Ltd. 4 , Agent 6, Contents of amendment (1) The power of attorney is supplemented as shown in the attached sheet. , Nishi'2

Claims (5)

[Claims] (1) Consists of an upper moving bed that cools and transports high-temperature baked ingots from the firing device, and a lower moving bed that cools and transports baked ingots transferred from this upper moving bed via an airtight discharge storage hopper. In the apparatus for cooling baked ingots, appropriate partition walls are provided on the lower surfaces of the upper moving bed and the lower moving bed along the conveying direction, and an air supply is provided to introduce a cooling medium at a temperature corresponding to the degree of cooling of the baked ingots. A cooling device for baked ingots, characterized by forming a chamber. (2) The upper moving bed is a reciprocating lattice type carrier,
2. The apparatus for cooling baked ingots according to claim 1, wherein the lower moving bed is a conveyor-type conveyor. (3) Consists of an upper moving bed that cools and transports high-temperature baked ingots from the firing device, and a lower moving bed that cools and transports baked ingots transferred from this upper moving bed via an airtight discharge storage hopper. In the apparatus for cooling baked ingots, appropriate partition walls are provided on the lower surfaces of the upper moving bed and the lower moving bed along the conveying direction, and an air supply is provided to introduce a cooling medium at a temperature corresponding to the degree of cooling of the baked ingots. forming a chamber, and separating the upper chamber on the upper moving bed into two chambers in the conveyance direction;
The sintering system is characterized in that it is also equipped with a heat exchange device for extracting heat from the temperature rising cooling medium in the upper chamber on the downstream side, and has an air supply pipe that supplies the heat-recovered cooling medium to one of the air supply chambers. Cooling device for lumps. (4) The upper movable bed is a reciprocating lattice type carrier.
4. The apparatus for cooling baked ingots according to claim 3, wherein the lower moving bed is a conveyor-type conveyor. (5) The air supply pipe is connected to an air supply chamber provided on the downstream side in the conveyance direction of the upper chamber on the upstream side of the upper movable bed or to an air supply chamber provided on the upstream side in the conveyance direction of the lower movable bed. A cooling device for baked ingots according to claim 3 or 4, characterized in that: