JPS589183Y2 - Gas circulation kiln - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a gas circulation firing furnace for firing carbon-generating products such as carbon live electrodes.

Generally, when manufacturing carbon molded products such as carbon electrodes, coke and a binder such as tar pitch are kneaded to obtain a predetermined shaped product, and the product is heated at 700 to 1000°C.
After firing at a temperature of 2,000 to 30
A method of graphitizing by heating to a high temperature of about 00° C. is adopted.

As mentioned above, when firing the product, a gas circulation firing furnace is often used.

A general example of this gas circulation firing furnace is shown in FIGS. 1 to 3, and its outline will be explained.

Fig. 1 is a schematic plan view showing the overall configuration of a general example of a gas circulation firing furnace, and this firing furnace 1 consists of 16 unit firing furnaces A.
The configuration is such that eight units are arranged in two rows in parallel.

In addition, each unit kiln A is 4 in the counterclockwise direction in Figure 1.
Numbers ■～■ are attached.

For example, as shown in FIG. 2, each unit firing furnace A has four combustion chambers C1 to C4 each equipped with a predetermined number of liquid fuel or gaseous fuel combustion burners B, and two combustion chambers for each of these combustion chambers C1 to C4. A total of 8 firing rooms D10. D1□;D
2□, D2□; D3□, D32; D4□, D4□.

That is, the four combustion chambers C1 to C4 are arranged in parallel,
A first row of four firing chambers Dll, D2□+D31+D41 are formed adjacent to these combustion chambers C1 to C4, and a second row of firing chambers Dll and D2□+D31+D41 are formed adjacent to these combustion chambers C1 to C4. The four firing chambers in the row D1□, D22. D
3° and D4° are formed.

Note that each of the firing chambers D1□ to D4□ has a partition wall Fa made of a cassette brick in which a ventilation hole E that communicates with the upper and lower sides is formed.

Surrounded by Fb.

Furthermore, the ventilation hole E of the partition wall F of each unit firing furnace A and the combustion chambers C1 to C4 of other unit firing furnaces adjacent to this unit firing furnace A are communicated with each other by a flow passage G at the bottom of the furnace, as shown in FIG. A rising exhaust flue H is connected to this flow path G.

A main flue ■ is provided around the firing furnace 1, and the main flue ■ surrounds the firing furnace 1 at its lower part. Road J is established.

The main flue (■) communicates with the atmosphere via a cooling device and a dust collector (not shown).

Next, regarding the method of firing carbon-generating products such as raw electrodes using the firing furnace 1 shown in FIGS. 1 to 3, No. 4
An example will be explained in which the main firing is performed in a unit firing furnace.

In this case, the unit firing furnace No. 4 ■ is the furnace that is performing auxiliary firing,
The unit firing furnaces numbered ■ to ■ are heating up, number 4 ■, and 6. ■,
Unit firing furnace No. 4 is cooling after completion of firing; Unit firing furnace No. 4 ■ is taking out fired electrodes; Unit firing furnace No. 4 ■ is taking out fired electrodes; The unit firing furnace number ■ is under repair or preparing for raw electrode filling, the unit firing furnace No. 4 ■ is currently filling the raw electrode, and the unit firing furnace No. 4 [phase] is filling the raw electrode. It has become a complete furnace.

In the above state, the combustion chambers C1 to C4 combustion burners B of the unit firing furnace No. 4 ■ during the main firing are burning, and the combustion chambers C1 to C4 combustion burners B of the unit firing furnace No. 4 ■ are burning, and the The upper end of the rising exhaust flue H is connected to the upper end of the rising flue J by a connecting pipe K.

Further, the upper ends of the exhaust flues H of the unit firing furnaces No. 4 (1) to (4) are each closed, and the upper surface of each of the unit firing furnaces No. 4 (1) to (4) is covered with a furnace lid.

In addition, in each of the firing chambers D1□ to D42 of these unit firing furnaces, a plurality of raw electrodes M are arranged in two stages, for example, upper and lower, at intervals through furnace filling work in advance, and coke is placed between each of the raw electrodes. Filler N for preventing oxidation and deformation of silica sand, etc.
is filled.

Combustion chambers C1 to C4 of the unit firing furnace No. 4 during the main firing
As shown by the arrows in Fig. 3, the combustion gas from Combustion chamber C1 of the unit firing furnace No. 4 ■ next to the bottom of the unit firing furnace ■
4 as shown by the virtual line arrow in Figure 1.
The combustion gas is circulated through each unit kiln furnace numbered from ■ to ■.
Exhaust gas is discharged from the exhaust flue H between the unit firing furnaces of door number ■ and [phase] to the connecting pipe and through the rising flue J to the main flue ■.

When the raw electrode in the unit firing furnace No. 4 (■) is completely fired, the combustion burner B of that unit firing furnace is stopped, and the combustion burner B of the adjacent unit firing furnace (No. 4 ■) is fired. , and remove the connecting pipe K from the exhaust flue H between No. 4 ■ and [phase] to close the upper end of this exhaust flue H, and at the same time close the upper end of the exhaust flue H between No. 4 [phase] and 0. is connected to a rising flue J nearby by a connecting pipe K.

In this way, the unit firing furnace No. 4 (2) becomes the main firing furnace, the unit firing furnace No. 4 (2) becomes the auxiliary firing furnace, and the unit firing furnace No. 4 (2) to [phase] becomes the furnace in which the temperature is being raised.

In this way, the raw electrodes are fired by constantly circulating the combustion gas through all the unit firing furnaces.

In the gas circulation firing furnace as described above, a raw electrode is inserted into each firing chamber Dll to D42 of each firing furnace A1 to A16, and a filler such as coke powder is filled therein.

Furnace filling work and furnace unloading work to discharge the filling around the fired electrodes and take out the fired electrodes must be performed for each unit firing furnace in turn. Work must be done while standing on the kiln.

However, during these operations, especially when filling the filler and removing the fired electrode, a large amount of filler powder such as coke powder is scattered and suspended as dust, which poses a serious health and hygiene problem for the working tools.

This invention was made in view of the above circumstances, and the purpose is to prevent workers from inhaling dust and damaging the integrity of the furnace during filling and/or unloading operations.

In other words, the gas circulation kiln of this invention is such that a dust collector for sucking floating dust from each kiln is mounted on the unit kiln that performs the unloading and/or filling work. It is.

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

Figures 4 and 5 are views showing an example of the dust collector 10 used in the gas circulation firing furnace of this invention, and Figure 6 shows the state in which the dust collector 10 is placed in the unit firing furnace A of the firing furnace. FIG.

In this example, the dust collector 10 is installed in each firing chamber D1□ to D42.
It also serves as a screen door device that covers the upper opening end of the screen so that it can be opened and closed separately.

The dust collector 10 is made into a rectangular shape as a whole so as to be placed on the upper surface of one unit firing furnace A of the gas circulation firing furnace 1, and has a longitudinal direction of each firing chamber D1□ to D4°. Five dust suction pipes 11, to 115 each having a hollow cross-section shape and provided in parallel so as to be placed on the upper surface of each partition wall Fa along the direction;
The dust suction pipes 111-11. and the auxiliary support frame 12.13 provided to connect the dust suction pipe 11.
□～11. and a bottom plate 14 laid on the upper surface of the auxiliary support frame 12.13 and formed with a plurality of openings 14.1 to 1442 corresponding to the upper opening ends of each firing chamber DIl to D4°.
and a skirt plate 15 provided in an inclined manner at the peripheral portion.

The dust suction pipes 11□-11. As shown in detail in FIG. 5, a dust suction port 16 that opens toward the open end of each of the firing chambers D1□ to D42 is formed at the lower side of the side surface, and each of the dust suction pipes 11, to 115 has a Relay pipe with cross-sectional opening shape 17□
~17. are connected, thereby each dust suction pipe 11, to 1
15 is a relay pipe 17□~17. through the suction ports 18□ to 18. at the corner of the dust collector 10. is communicated with.

These suction ports 181-18. is for connecting to a suction device such as a suction pump (not shown).

Furthermore, each of the dust suction pipes 11□ to 11. Two upper and lower rails 20 and 21 for guiding the opening and closing movement of the screen door 19, which will be described later, are protruded from the side surface along the longitudinal direction.

These rails 20.21 are connected to the firing chambers Dn, D21, Da□, D4 on the left in FIGS. 1 and 6, and the firing chamber D12 on the right. D22. D32. It is formed so as to be continuous with D42.

Each of the screen doors 19 has a peripheral portion of the screen 23 fixed to a rectangular screen door frame 22, the screen 23 is reinforced with appropriate crosspieces 24, and an opening 25 is formed in the center of the screen 23, The rails 20.2 are installed on both sides of the long side of the screen door frame 22.
It has a structure in which a plurality of rollers 28 that roll along the roller 1 are pivotally connected.

The screen door 19 is guided by the rails 20.21 and moves horizontally, thereby causing each of the baking chambers D1□ to D
The upper opening ends of 42 can be opened and closed separately.

Incidentally, a mounting post hole 26 is formed at an appropriate location on the upper surface of the dust collector 10, into which a mounting post (not shown) for attaching a safety belt for worker protection can be removably inserted. Furthermore, engagement holes 27 are formed at the four corners of the dust collector 10 to engage the hooks of a crane when the dust collector is lifted by a crane.

In the above-mentioned embodiment, during the furnace filling work, the furnace lid L (
The dust collector 10 is placed by crane on the upper surface of the unit kiln A (for example, No. 4 0 in FIG. 1) from which the unit kiln (see FIG. 3) has been removed.

At this time, the dust collector 10 is positioned so that its dust suction pipes 11, - 115 are placed on the upper surface of the partition wall Fa along the longitudinal direction of each of the firing chambers Dll - D42.

Then, a worker is placed on top of the dust collector 10 again in the firing chamber D.
The screen doors 19 above Il~D4□ are opened one by one, and the raw electrodes are placed in each firing chamber DIl~D4 while the worker finely adjusts the lowering position of the raw electrodes lifted by the crane.
Insert sequentially into □.

At this time, it is desirable to close the screen doors 19 of the firing chambers other than the firing chamber into which the live electrode is currently being inserted, to prevent accidents in which the working tools fall into other firing chambers.

It is also preferable that the worker wears a safety belt around his or her waist, and fixes one end of the safety belt to a support (not shown) inserted into the mounting support hole 26.

After inserting the raw electrodes into the firing chambers D1□ to D4□ as described above, all the screen doors 19 are closed, the surface of the screen door 19 except for the openings 25 is covered with a synthetic resin sheet, and the unit is placed on the unit firing furnace by a crane. A supply hose is lowered from the transported filler supply can and the tip of the supply hose is inserted into the opening 25 of the screen door 19.

In addition, a suction device such as a suction pump is connected in advance to the suction ports 181 to 185 at the corners of the dust collector 10.

Then, a filler such as coke powder is charged into the firing chamber from the filler supply can, and the suction device is operated.

In this way, dust such as fine coke powder that is scattered or suspended when charging the filler is removed from the dust suction pipes 11□ to 11. The dust is sucked into the dust suction port 16 of each dust suction pipe 11, to 11. and relay pipe 17□
~17. and is collected by the suction device.

Therefore, it is possible to prevent a worker who is sitting on the dust suction device 10 in order to operate the filler replenishment can or the supply hose from inhaling dust and endangering his health.

In addition, when embedding live electrodes in two stages, upper and lower, as shown in Figure 3, first insert the lower live electrode, then charge the filler, and fill the area around and on the upper surface of the lower live electrode. Then, after inserting the upper live electrode, the filling material is inserted again to fill the periphery and upper surface of the upper live electrode.

On the other hand, when removing the fired electrodes from the furnace, the dust collector 10 is placed on the upper surface of the unit firing furnace A, for example, number 4 0 in FIG.

Then, the granulator is transported onto the unit kiln A by a crane, and the screen door 19 on each kiln chamber is sequentially opened, and the granulating nose of the granulator is lowered into the kiln chamber to suck in the filler. This is then discharged out of the furnace.

Thereafter, the fired electrodes are sequentially lifted up from each of the firing chambers DIl to D4□ by a crane and discharged out of the furnace.

When taking out the fired electrodes in this way, the suction ports 18□ to 18. is connected to a suction device, and the suction device is driven to remove the dust suction pipe 1.
The dust of the filler is sucked from the dust suction ports 16 of 1□ to 115.

If the electrodes are buried in two layers, upper and lower, as shown in Figure 3, first drain the filling material around the upper electrode, remove the upper electrode, and then remove the filling material around the lower electrode. After discharging the material, remove the lower electrode.

In this case, especially when the upper electrode is taken out, a large amount of dust is suspended, so the dust suction effect as described above becomes great.

Furthermore, during the electrode extraction work, it is desirable that the worker wears a safety belt as described above and closes the screen door 19 of the firing furnace other than the one in which the electrode is being taken out, thereby preventing accidents such as falling.

In the above explanation, normally, while unloading work is being done in one unit kiln, filling work is often done in another unit kiln when it is open, so usually two kilns are installed in one gas circulation kiln. Use a dust collector.

Furthermore, after the filling and unloading operations are completed, the loading and unloading operations are sequentially performed in the adjacent unit firing furnaces, so the two dust collectors may also be moved to the unit firing furnaces in sequence.

As is clear from the above explanation, the gas circulation firing furnace of this invention has a dust collector that sucks floating dust above each firing chamber into the unit firing furnace that performs the unloading work and/or the filling work. Since the structure is such that there is no risk of harm to the health of the workers on the kiln by inhaling dust during unloading and kiln filling work, it is therefore highly effective in terms of work hygiene. It is.

[Brief explanation of drawings]

Figure 1 is a schematic plan view showing a general example of a gas circulation firing furnace to which this invention is applied, and Figure 2 is a part of the gas circulation firing furnace shown in Figure 1 (with the lid of the unit firing furnace removed). Fig. 3 is a longitudinal cross-sectional view taken along the line III-III in Fig. 2 (with a furnace cover attached to the unit kiln), and Fig. 4 is an enlarged plan view showing the state in which the kiln was used in this invention. Fig. 5 is an enlarged sectional view of the main part taken along the line ■-V in Fig. 4, and Fig. 6 shows the dust collector shown in Fig. 4 mounted on a unit kiln. FIG. 1... Gas circulation firing furnace, A... Unit firing furnace (No. 4 ~ [phase]), Fa', Fb... Partition wall, 10...・Dust collector, 11□~115...
...Dust suction pipe, 16...Dust suction port.

Claims (1)

[Scope of utility model registration request] A plurality of unit firing furnaces, each having a plurality of firing chambers, are arranged in a ring, and combustion gas is circulated through a predetermined number of unit firing furnaces to fire carbon-generating products. In a gas circulation kiln in which the remaining unit kilns are used to pack carbon products and unload fired carbon products, the upper surface of the partition wall surrounding each firing chamber of the unit kiln. At least one dust suction pipe made of a combination of a plurality of dust suction pipes each having a dust suction port opening toward the firing chamber formed on the side of a hollow pipe that is shaped so that it can be placed along the firing chamber.
The dust collector is equipped with a basic dust collector, and the dust collector is used during furnace filling work and/or
Alternatively, a gas circulation firing furnace is placed in a unit firing furnace during unloading work, and the dust collection pipe is connected to a suction device such as a suction pump to collect dust.