JPS6036873Y2 - Cooling device for cooling zone in continuous industrial kiln - Google Patents

Description

[Detailed explanation of the invention] This invention consists of direct cooling in which cold air is forcibly blown out and cooled while circulating in the cooling zone of a continuous industrial kiln, and cold air passing through the tubes of a group of tubes in the cooling zone. The present invention relates to a cooling device for a cooling zone in which heat exchange through a group of tubes can be performed more effectively.

Conventionally, as a cooling method for the cooling zone in a continuous industrial kiln,
There are two methods: indirect cooling method and direct cooling method.

Indirect cooling methods include indirect cooling using a double structure of side walls and a ceiling, and a method in which cold air is sent from one side of each tube to the other side of each tube in a group of tubes installed in a cooling zone.

Direct cooling methods include those in which cold air is blown horizontally into the kiln from the outlet of the cooling zone through the gap between the object to be fired and the ceiling.

However, all conventional cooling methods using cooling zones have been limited to those that employ either indirect cooling or direct cooling alone.

The purpose of this device is to use both direct cooling and indirect cooling, and by organically combining the two, the hot gas in the cooling zone is forced to circulate together with the cold air from outside, thereby cooling the cooling zone. The air is rapidly cooled both directly and indirectly, and outside air is forced into the tubes from one end of the tube group installed in the cooling zone, and preheated air for combustion is sent from the other end of the tube group near the heating zone. The cooling zone in a continuous industrial kiln allows the air inside the tubes to exchange heat more actively and effectively with the hot gas in the cooling zone circulating outside each tube. Provides cooling equipment.

An embodiment of this invention will be described below with reference to the drawings.

1.1' is each side wall on one side and the other side of cooling zone C in a continuous industrial kiln, 2a, 2a', 2b, 2b'92
Cg 2C', se****2n, 2n' indicate in-furnace headers with both ends closed, which were installed oppositely along the lower side and the other side of both side walls 1 and 1' of the cooling zone C, respectively.

3 is a group of arch-shaped tubes for heat exchange. The shape of the tube group is not particularly limited, but in this example, an arch-shaped tube group arranged along both side walls 1, 1' and the ceiling 4 is taken as an example, and the following is shown. explain.

Both ends of each arched tube 3a are connected to the in-furnace headers 2a and 23' on the negative side and the other side, respectively. 2b and 2b'...
The arch-shaped tubes 3a are connected and fixed to the furnace header 2a at a predetermined interval along the furnace length direction.
and 23', 2b and 2b'.

5 is the in-furnace header 2av on the negative side and the other side connected to the arch-shaped tube group 3 and both ends of the tube group 3;
This is a single cooling device consisting of 2a't 2bt 2b'.

This single cooling device 5 has a plurality of units 5 at 5 bq 5 C9 along the longitudinal direction of the cooling zone C from the outlet side (low temperature side) of the cooling zone toward the heating zone B side (high temperature side).
・5n installed, the single cooling device installed near the exit side of cooling zone C is the first 5a, the adjacent unit is the second 5b,
In the following order, it will be the 3rd 5C...the nth 5n.

In the figure, 10 is an outlet of the cart 13, 11 is a door, 14 is an object to be fired, and 15 is a flow rate adjustment valve, which is used to adjust the flow rate of outside air inside the tube.

Cooling device unit 5 a t 5 bt 5 c...
As a means of connecting 5n, it is possible to directly connect the in-furnace headers ±2a' and 2b', 2b and 2c, etc., but it is not necessarily limited to this. Of course, the connection may be made indirectly via the outside-of-furnace header 6 shown below.

That is, reference numeral 6 indicates independent external headers closed at both ends, which are alternately arranged outside the side walls 1 and 1' on one side and the other side of the cooling zone C, as shown in the first diagram. 6a in order from the one closest to the exit side.

6b,...6n.

Each one of the out-of-furnace headers 6 arranged alternately on the outside of the side walls 1 and 1' is connected to the side wall 1 or 1'.
Connect the in-furnace headers 2a and 2a' or 2b and 2b' on one side or the other side of the furnace that are opposite to each other with the two sides in between.

That is, the in-furnace header 2a' on the other side of the first cooling device unit 5a located on the exit side of the cooling zone C, and the side wall 1.
When the outside header 6a, which is located at a position opposite to the outside header 6a, is connected via the communication pipe 7a penetrating the side wall 1', both the outside header 6a and the other side of the second cooling device unit 5b are connected. The furnace header 2b' is connected to the furnace header 2b' via a connecting pipe 7b penetrating the side wall 1'.

Furthermore, the in-furnace header 2b on one side of the second cooling device unit 5b and the out-of-furnace header 6b located opposite to this with the side wall 1 interposed are connected via the communication pipe 7c penetrating the side wall 1) In addition, the outside header 6b and the in-furnace header 20 on one side of the third cooling unit 5C are connected via a communication pipe 7d penetrating the side wall 1.

Hereinafter, in accordance with the above procedure, each adjacent in-furnace header 2a' and 2b', 2b and 2c...and the corresponding out-of-furnace header 6 ay 6 by 6 Ct""
"6n to connecting pipes 7a, 7b, 7c, 7d, 7e...
...Connect via 7n.

And the last in-furnace header 2n' is a connecting pipe to the combustion air preheating pipe 8 used as combustion air in the heating zone B? n'
Connect via.

Reference numeral 9 denotes a pipe that is connected only to the in-furnace header 2a on one side of the first cooling device unit 5a and forcibly sends outside air using a blower (not shown).

Reference numeral 13 indicates a trolley that is continuously transported within the continuous industrial kiln by a hydraulic pusher (not shown), and reference numeral 14 indicates the objects to be fired loaded on the trolley 13.

Next, the cold air outlet will be explained.

In this example, we will explain the case where they are arranged vertically on both side walls, but the invention is not necessarily limited to this. For example, the cold air blowing holes are arranged in a staggered plane with one side wall facing upward and the other downward. Alternatively, a set of cold air blowing holes arranged above and below with different phases may be formed on one side wall, and the cold air blowing holes may be arranged alternately on both side walls.

As shown in the first diagram, the cooling zone C is on a longitudinal section in the width direction,
A plurality of cold air blowing holes 1 are provided on the upper side of one side wall 1 to force cold air into the cooling zone via a cooling fan, an in-furnace glass recirculation fan, or an injector (not shown).
Cool air blowing holes 12' similar to those described above are formed in the lower and lateral direction of the other side wall 1', respectively, and the hot gas in the cooling zone C is forcibly stirred to generate a strong swirling flow.

The arrangement of these cold air blowing holes 12, 12' in the cooling zone C is such that the upper and lower holes of the cold air blowing holes are arranged at equal intervals along the longitudinal direction of both side walls 1, 1' (corresponding to the gap between the burning area and the dirt floor). The holes are drilled so that the installation positions are alternately in a completely opposite relationship to the above relationship.

That is, every other one should be on top and the other on the bottom (see Figure 1-2).

In this way, the cold air blowing holes are drilled with one side of the width direction of both sides walls 1 and 1' facing upwards and the other side facing downwards, and the upper and lower positions of the holes are alternately changed along the longitudinal direction of both sides walls. The reason for this arrangement was that the cold air jetted out at high speed in the direction of the width of the reactor from the upper and lower positions within the cooling zone entrained nearby hot gas in the cooling zone and swirled at high speed in the direction of the width of the reactor, resulting in cooling. In order to ensure uniform cooling with no temperature change in the upper and lower positions within the zone, each tube 3a of the arch-shaped tube group 3 installed in the cooling zone C rotates along the direction of each tube 3a. This is to enable active and efficient heat exchange with the hot gas inside.

Since this idea has the above structure, in its practical use,
After the material to be fired 14 loaded on the continuously transported trolley 13 passes through the pre-heating zone (not shown) and the heating zone B in sequence, it is placed in the cooling zone C by cold air blowing holes provided in both side walls 1° 1'. Cold air is ejected from the cold air blowing holes 12, 12', which are provided by alternating the upper and lower positions of the holes 12, 12', toward the void portion of the object to be fired 14, and the ejected cold air is It rotates at high speed in the width direction of the furnace, drawing in nearby hot gas.
The object to be fired 14 is cooled at a uniform temperature with no temperature change in the upper and lower positions within the cooling zone C.

The hot gas swirling between the objects to be fired 14 is alternately swirled in opposite directions, and unlike the case where the hot gas is constantly swirled in one direction within the cooling zone C, there is no temperature unevenness during cooling.

On the other hand, the in-furnace header 2a of the first cooling device unit 5a
A blower (not shown) is used to forcibly send outside air to the pipe 9 connected to the furnace header 2a, thereby filling the furnace header 2a with outside air.

The outside air that filled the furnace header 2a of the first cooling device unit 5a is dispersed into each tube 3a of the arched tube group 3, and the outside air that passes through each tube 3a flows out from the side wall 1, the ceiling 4, and the side wall 1. ′, each tube 3a of the arched tube group 3 is forced into contact with the hot gas in the cooling zone rotating at high speed along each tube, and the air in each tube 3a is forced into contact with the hot gas in the cooling zone. Heat exchange takes place actively.

Note that since the temperature of the cooling zone C decreases from the heating zone B side toward the outlet side 10, each tube 3a of the arch-shaped tube group 3 is heated to a different temperature.

The outside air passing through the tube group 3 is collected in the in-furnace header 2a', gathers at - point, flows out from this through the communicating pipe 7a to the out-of-furnace header 6a, and merges into the out-of-furnace header 6a, Further, it passes through the communication pipe 7b and flows into the in-furnace header 2b' on the other side of the second cooling device unit 5b.

Next, the heated outside air from the in-furnace header 2b' is dispersed again by the arch-shaped tube group 3, and then collected in the in-furnace header 2b, and passed through the communication pipe 7c to the out-of-furnace header 2.
b, from the outside header 6b to the in-furnace header 2c of the third cooling device unit 5c via the communication pipe 7d, and after being dispersed in the arch-shaped tube group 3, it collects in the in-furnace header 2C'. let

Thereafter, the air is sent to the combustion air preheating pipe 8 through the connecting pipe 7 and the header 6 outside the furnace.

Therefore, the outside air forcibly sent from the furnace header 2a on one side of the cooling device unit 5a located on the exit side of the cooling zone is
The final cooling device unit 5n is collected and dispersed repeatedly in a meandering manner through external headers 6 arranged alternately on the outside of the cooling unit unit 5 and the side wall 1.1′.
Uniform and high-temperature preheated combustion air can be obtained from the other end.

As can be seen from the above explanation, this idea consists of a single cooling device in which each end of a group of tubes is attached to a fixed length header installed on both sides of the cooling zone in a continuous industrial kiln.
If a plurality of units are installed along the longitudinal direction of the cooling zone, and a pipe is provided to force outside air only to the header on one side of the first single cooling device located on the exit side of the cooling zone, The header on the other side of the first cooling device and the header on the other side of the second cooling device can be directly connected to each other, or indirectly connected via an external header, and the second cooling The header on one side of the single device and the header on one side of the third cooling device are directly connected to each other, or indirectly connected via an in-furnace header, and then alternately connected in a staggered manner, Also, a plurality of cold air blowing holes are provided on both side walls of the cooling zone to forcefully send cold air so that the cold air is circulated in the furnace width direction of the cooling zone via a cooling fan, an in-furnace gas recirculation fan, or an injector. Therefore, cold air is forcibly injected from above and below the side wall, and the cold air and hot gas are forcibly stirred within the cooling zone mainly through convection, resulting in a strong swirling flow.

In addition, the cold air blowing holes installed on both side walls are arranged above and below). This makes the temperature distribution inside the furnace uniform between the upper and lower parts, and the object to be fired can be cooled uniformly and quickly.

In addition, if a tube is provided to force outside air only to the in-furnace header on one side of the first cooling device located on the exit side of the cooling zone, it is possible to Directly or indirectly connect the header and the header on the other side of the second single cooling device, and connect the header on one side of the second single cooling device with the header on one side of the third single cooling device. The tubes are connected directly or indirectly, and then connected in alternating order, so that the outside air forcibly sent from one location of the header located on the outlet side is distributed to a large number of tube groups within the cooling zone. heat exchange is even more powerful and active due to the forced contact of the hot gas in the cooling zone, where the outside air passes through each tube and swirls at high speed along each tube. )Become.

After the heat is efficiently exchanged by distributing it to a large number of tube groups within the cooling zone, it is passed through the large number of tube groups within the cooling zone again and sequentially from the outlet side of the cooling zone toward the heating zone. The dispersion and collection are repeated in a meandering manner, and preheated air for combustion at a uniform temperature can be efficiently obtained from the other end of the cooling device located near the heating zone.

In particular, since the outside air passing through the tube group in the cooling zone is sent one after another while repeating dispersion and merging, it is possible to obtain preheated air for combustion at a uniform temperature from the other end of the final cooling device. be.

In addition, when stirring and mixing the dispersed air passing through the tube group using a header installed outside the furnace, unlike installing the header in the side wall, there is no need to increase the thickness of the side wall.
Not only can it be made smaller, but the header can be easily repaired and inspected.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing an embodiment of this invention, and FIG. 2 is a sectional view showing a cooling device for a cooling zone. 1.1'...Side wall, 2,2'...Furnace header, 3...Archid tube group, 5...
... Cooling device alone, 6 ... Header outside the furnace,
12...Cold air outlet.

Claims (1)

[Scope of utility model registration request] In a continuous industrial kiln, multiple cooling devices are installed along the longitudinal direction of the cooling zone, each consisting of both ends of a group of tubes attached to fixed-length headers installed on both sides of the cooling zone. If a pipe is provided to force outside air only to the header on one side of the first cooling device located on the outlet side of the belt, both the header on the other side of the first cooling device and the second The headers on the other side of the second cooling unit are directly connected to each other, or the headers on the other side of the second cooling unit are connected to each other indirectly through an external header, and the header on one side of the second cooling unit is connected to the header on the other side of the third cooling unit. The headers on one side are directly connected to each other, or indirectly connected through an external header, and then alternately connected in a staggered manner, and through a cooling fan, an in-furnace gas circulation fan, or an injector. A cooling device for a cooling zone in a continuous industrial kiln, comprising a plurality of cold air blowing holes for forcibly sending cold air to both side walls of the cooling zone so that the cold air circulates in the width direction of the cooling zone.