JPH07118665A - Apparatus for hot briquetting of quickly heated pulverized coal and method for hot briquetting - Google Patents

Abstract

PURPOSE:To provide an apparatus for hot briquetting of quickly heated pulverized coal capable of facilitating the conveyance of modified pulverized coal having caking properties imparted thereto by quick heating, soundly carrying out the forming of lumps and preventing the temperature of the modified pulverized coal from lowering and the quality of coke from deteriorating and a method for hot briquetting of the quickly heated pulverized coal. CONSTITUTION:This apparatus for hot briquetting of quickly heated pulverized coal is obtained by arranging an introduction chute 7 just above briquetting rolls 6 and installing a heater 9 for maintaining the temperature of modified pulverized coal in the introduction chute 7 in an apparatus 11 for hot briquetting of the quickly heated pulverized coal capable of forming pulverized coal in a semimolten state modified by a quick heating apparatus into lumps with the briquetting rolls 6 and conveying the resultant junps to a carbonization furnace.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot forming apparatus and a hot forming method for rapidly heating pulverized coal which agglomerates pulverized coal modified by a rapid heating device and conveys it to a carbonization furnace. More particularly, the present invention relates to a hot forming apparatus for rapidly heating pulverized coal in which an introduction chute disposed immediately above a forming roll is improved so as to be suitable for introducing rapid heating pulverized coal, and a hot forming method using the same.

[0002]

2. Description of the Related Art A coke oven is known as a facility for producing coke by carbonizing coal which has been subjected to pretreatment such as crushing and blending. This coke oven is operated by charging raw coal powder from the charging hopper of the charging vehicle into the carbonization chamber and then burning the coke oven gas or blast furnace gas in the combustion chambers located on both sides of the coal feed chamber. After carbonizing the charcoal, remove the furnace lids at both ends of the carbonization chamber, extrude the red hot coke with the extrusion ram of the extruder, guide the extruded red hot coke with the guide grid, and load it on the coke bucket car. Repeat.

The charging of raw coal powder into a conventional coke oven is as follows.
Even when the raw coal powder was preheated using a pre-carbon facility or the like, the temperature was about 200 to 250 ° C. at the maximum, and the coal powder containing a certain amount of water was charged into the carbonization chamber of the coke oven for dry distillation. Caking coal, which has a high raw material cost, is used as the raw material pulverized coal, and a part of non-caking coal, which has a relatively low raw material cost, is mixed with this. Further, the raw coal powder had good high-temperature fluidity, and there were no problems in coal transportation except safety and environmental measures.

In recent years, coal is not charged into a coke oven as it is as pulverized coal, but is rapidly heated to 350 ° C. or more (100 ° C./m 2) by the heat introduced from a hot-air stove before charging into the coke oven.
The coke production process of increasing the fluidity of coal by reforming it after more than 1 in) is drawing attention. This is because rapid heating causes even non-melting coal to start melting under certain temperature conditions, so that a large amount of non-caking coal with low raw material cost can be used.

However, when coal is rapidly heated, a caking component is exuded from the surface of the coal. Therefore, when the coal is charged into the coke oven as it is, not only dust is generated but also the coal is melted in the charging hopper during the transportation process. Since a substance adheres and hinders charging, it is considered to perform hot forming and agglomeration before charging into a coke oven.

[0006]

However, when attempting to agglomerate the rapidly heated reformed pulverized coal by a conventional molding device, the overheated coal particles are heated to the softening start temperature in the conveying / agglomeration process. By the sticky substance that exudes from the pulverized coal surface,
There is a problem in that the agglomeration cannot be performed soundly due to a possible trouble in the transportation process such as adhesion inside the introduction chute directly above the forming roll.

Rapid heating to 350 ° C. or higher (100 ° C.
/ Min) or more) and the semi-molten pulverized coal has its caking property remarkably lowered once the temperature is lowered to about 10 ° C to 20 ° C. Therefore, if this is carbonized, the quality of coke deteriorates. Occurs. Therefore, when agglomerating the rapidly heated reformed pulverized coal, it is important to maintain the temperature inside the system to maintain the temperature. However, in the conventional equipment, there is a problem that there is no hot forming apparatus capable of coping with this.

[0008] In view of the above problems, an object of the present invention is to facilitate transportation of the modified pulverized coal having a caking property by rapid heating so that agglomeration can be performed soundly, and It is an object of the present invention to provide a hot forming apparatus and a hot forming method for rapidly heating pulverized coal which can prevent a temperature decrease and a coke quality deterioration.

[0009]

In order to achieve the above object, a hot forming apparatus for rapid heating pulverized coal according to the present invention comprises agglomerating semi-molten pulverized coal modified by a rapid heating apparatus with a forming roll. In a hot forming apparatus for rapid heating pulverized coal conveyed to a carbonization furnace, an introducing chute is arranged directly above the forming roll, and a heating device for maintaining the temperature of the reformed pulverized coal is provided in the introducing chute. is there.

Further, an introducing chute is arranged directly above the forming roll, and a pushing device for forcibly pushing the reformed pulverized coal into the introducing chute is equipped.

Further, an introducing chute is provided directly above the forming roll, and a heating device for maintaining the temperature of the reformed pulverized coal is installed in the introduction chute, and the pushing chute for forcibly pushing the reformed pulverized coal. It is equipped with a device.

In the structure of the hot forming apparatus, preferably, the heating device is formed by a heating tube through which a heat medium passes.

Further, in the structure of the hot forming apparatus,
Preferably, the heating device is an electric heating device.

Further, in the construction of the hot forming apparatus, preferably, the pushing device comprises a main pushing device arranged in the central portion of the introducing chute and an auxiliary pushing device arranged in the peripheral portion. There is something.

In the structure of the hot forming apparatus, preferably, the pushing device is formed by a screw conveyor or a chain conveyor.

In addition, in the structure of the hot forming apparatus, it is preferable that the introduction chute has a deaeration hole for letting air generated by the compaction of the forming roll escape to the outside.

On the other hand, in order to achieve the above object, the hot forming method for rapidly heating pulverized coal according to the present invention is a dry distillation furnace in which the semi-molten pulverized coal modified in the rapid heating step is formed into coal in the agglomeration step. In the hot forming method for rapidly heating pulverized coal to be supplied to the pulverized coal, the pulverized coal is formed in the agglomeration step while maintaining the temperature of the modified pulverized coal by the heating means.

Further, when forming the briquette in the agglomeration step, the reformed pulverized coal is forcedly pushed by the pushing means to carry out shaping.

Further, when the shaped coal is formed in the agglomeration step, the temperature of the rapidly heated pulverized coal is maintained by the heating means, and the reformed pulverized coal is formed by being forcedly pushed by the pushing means. It is a thing.

When the briquette charcoal is molded in the agglomeration step, the air generated during the molding is degassed to the outside.

[0021]

According to the structure of the hot forming apparatus, the introduction chute for introducing the semi-molten modified pulverized coal to the forming roll is equipped with the heating device for maintaining the temperature of the modified pulverized coal. There is. Therefore, the temperature of the modified pulverized coal is prevented from lowering in the process of being introduced into the forming roll, so that the caking property is not lowered and a high quality coke is produced.

Further, a pushing device for forcibly pushing the reformed pulverized coal is provided in the introduction chute arranged directly above the forming roll. Therefore, the modified pulverized coal having a caking property is unlikely to spontaneously fall in the introducing chute, but is forcedly conveyed to the forming roll by the pushing device, so that the agglomeration is performed soundly.

Further, if the introduction chute arranged directly above the forming roll is equipped with both the heating device and the pushing device, the reformed pulverized coal is agglomerated soundly and high quality coke is obtained. It is manufactured.

In the above structure, if the heating device is formed by a heating tube through which a heating medium passes, the temperature of the reformed pulverized coal can be maintained by the heating medium that can be easily secured. For example, hot air can be easily obtained from a hot air oven, and steam can be easily obtained from a dry cooling facility (CDQ).

If the heating device is formed by an electric heating device, the temperature can be easily adjusted.

Further, if the pushing device is composed of the main pushing device arranged in the central portion of the introducing chute and the auxiliary pushing device arranged in the peripheral portion, the pushing device stays in the peripheral portion which is likely to become a dead space. Even the modified pulverized coal is reliably guided to the forming roll by the auxiliary pushing device.

If the pushing device is formed by a screw conveyor or a chain conveyor, the forced pushing of the introduction chute into the discharge port can be achieved by a simple device.

In addition, if degassing holes are formed in the introducing chute, the air generated by the compaction of the forming roll escapes to the outside, so that the transportation of the reformed pulverized coal is not hindered.
It is a sound agglomeration.

On the other hand, according to the constitution of the above hot forming method,
This is to carry out the agglomeration step of forming the pulverized coal in the semi-molten state that has been modified by the rapid heating process into formed coal of a specified size.After that, the formed coal agglomerated by this process is transferred to the carbonization furnace. And supply. When the shaped coal is molded in the agglomeration step, the temperature of the modified pulverized coal is maintained by the heating means, so that the temperature of the modified pulverized coal is prevented from lowering during the conveying and forming processes. The coke is not deteriorated, and high quality coke is produced.

Further, when the shaped coal is formed in the agglomeration step, the reformed pulverized coal is forcedly pushed by the pushing means, so that the modified pulverized coal having a caking property is forced to the forming position. It is transported and is stably agglomerated.

Further, when the shaped coal is formed in the agglomeration step, the temperature of the rapidly heated pulverized coal is maintained by the heating means and the reformed pulverized coal is formed by being forcedly pushed by the pushing means. As a result, the modified pulverized coal is soundly agglomerated and high quality coke is produced.

When forming the briquette in the agglomeration step, the air generated during the briquetting is degassed to the outside. Therefore, the air generated by the consolidation during the molding escapes to the outside, so that the reformed pulverized coal is stably agglomerated without being hindered from being conveyed.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a hot forming apparatus and a hot forming method for rapid heating pulverized coal according to the present invention will be described in detail below with reference to the accompanying drawings. First, FIG. 1 is an explanatory diagram showing a coke manufacturing process. As shown in the figure, in this process, coal that has undergone pretreatment such as crushing and blending is charged into a coal reforming process, and in this coal reforming process, it is rapidly heated to 350 ° C. or higher by heat from a hot stove (100 (° C / min or more) to reform into a semi-molten pulverized coal having a caking property, and then perform hot forming in the agglomeration process in order to facilitate the transportation of the modified pulverized coal. The charcoal is hermetically charged into the carbonization furnace and the coke after carbonization is dry-cooled (CD
It is being transported to Q).

In a normal coke oven operation, about 8
Extruding red-hot coke at 00-1000 ℃,
In this process, coke is extruded at a relatively low temperature, and air is blown into the coke in a dry cooling facility to burn unburned gas to raise the temperature. In addition, the expression “carbonization furnace” is used instead of the expression “coke oven” in this process because the temperature is lower than that of the conventional coke oven (70
This is because coke is extruded at 0 to 800 ° C.

The hot forming apparatus for rapidly heating pulverized coal according to the present invention is used in the above agglomeration process,
As shown in FIG. 2, it is arranged between the rapid heating device 2 and the carbonization furnace 3. A cutout chute 4 for receiving the reformed pulverized coal rapidly heated by the rapid heating device 2 and supplying the reformed pulverized coal to the hot forming device 1 is provided immediately above the hot forming device 1 of the present embodiment. There is. The cutting chute 4 is equipped with a heating device 4a for keeping the temperature of the reformed pulverized coal constant at 350 ° C. or higher, and a discharge valve 4b is provided at its outlet. This heating device 4a is, for example,
It is formed by a heating tube through which a heat medium such as steam or hot air passes, or an electric heating device.

On the other hand, immediately below the hot forming apparatus 1 of the present embodiment, a charging hopper 5 for receiving the forming coal agglomerated by the hot forming apparatus 1 and charging it into the carbonization furnace 3. Is provided. Inside the charging hopper 5, the temperature of the forming coal is set to 35
It is equipped with a heating device 5a for maintaining the temperature above 0 ° C. This heating device 5a, like the heating device 4a,
For example, it is formed by a heating tube through which a heat medium such as steam or hot air is passed, or an electric heating device.

The hot forming apparatus 1 of the first embodiment arranged between the cutting chute 4 and the charging hopper 5 is
It is configured as shown in FIG. As shown in the figure, the hot forming apparatus 1 includes a forming roll 6 for agglomerating the modified pulverized coal cut out from the cutting chute 4, and the modified pulverized coal from the cutting chute 4 to the forming roll 6. It is constituted by an introduction chute 7 for introducing.

The forming roll 6 is composed of a pair of rolls 6a and 6b which rotate downward so as to face each other. The forming rolls 6a and 6b are formed on their outer peripheral portions with a predetermined amount of forming coal C. A recess (not shown) is formed.

The introducing chute 7 arranged directly above the forming roll 6 has a cylindrical shape, and a deaeration hole for letting air generated by the compaction of the forming roll 6 escape to the outside in the lower part thereof. 8 is formed. The degassing holes 8 are
In this embodiment, it is formed by a pair of spool pipes 8a that are opened obliquely upward.

Further, the introduction chute 7 is equipped with a heating device 9 for maintaining the temperature of the reformed pulverized coal charged therein. Similar to the heating devices 4a and 5a, the heating device 9 is formed by, for example, a heating tube through which a heat medium such as steam or hot air is passed, or an electric heating device. The hot air can be introduced from the hot air stove and the steam can be introduced from the dry cooling equipment (CDQ). In addition, if the electric heating device is equipped with a thermostat,
The temperature can be easily adjusted.

In the introducing chute 7, there is provided a pushing device 10 for forcibly pushing the reformed pulverized coal charged inside and introducing it into the forming roll 6. The pushing device 10 is composed of a main pushing device 10a arranged in the central portion of the introduction chute 7 so as to pass through the heating device 9 and an auxiliary pushing device 10b arranged in the peripheral portion.

In the first embodiment, the main pushing device 10a and the auxiliary pushing device 10b are, for example, formed by a screw conveyor having spiral fins having substantially the same width, and arranged in pairs. Has been done.
The auxiliary pushing device 10b is arranged in the peripheral part of the introducing chute 7 because the heating device 9 is provided in the introducing chute 7, so that the peripheral part becomes a dead space and the transportation of the reformed pulverized coal is hindered. This is because there is a possibility that

FIG. 4 is a schematic view showing the hot forming apparatus 11 of the second embodiment. As shown in the figure, in the second embodiment, the introducing chute 7 is formed to have a cone shape, and the main pushing device 10a is arranged on the axial core portion thereof. Therefore, the main pushing device 10a is formed of, for example, a screw conveyor having spiral fins that are gradually narrowed downward. A pair of auxiliary pushing devices 10b are arranged around the introduction chute 7 as in the first embodiment. The auxiliary pushing device 10b is formed of, for example, a screw conveyor having spiral fins having substantially the same width.

Further, FIG. 5 is a schematic view showing a hot forming apparatus 21 of the third embodiment. As shown in the figure, in the third embodiment, the introduction chute 7 is formed in a cylindrical shape, and is connected to a pair of chain conveyors so as to pass through the heating device 9 arranged therein. The pushing device 20 formed as described above is arranged. These chain conveyors 20
Is an endless chain 20a in which push-in pieces 20b are attached at equal intervals, and since the rising side of the chain 20a is exposed to the outside of the introduction chute 7, a refractory material or the like is installed to keep it heat. It is covered with the cooling prevention cover 22.

Next, the operation of the above embodiment will be described with reference to the method for hot forming pulverized coal of rapid heating according to the present invention. Coal has a particle size distribution after being crushed, and even if it is rapidly heated, the temperature of small particles increases immediately, and that of large particles delays the temperature increase. Therefore, the melting method varies depending on the particle size. That is, no matter how accurate the temperature control is, due to the characteristics of coal as a powder, an overheated one will always melt too much. Therefore, rapid heating to about 350 ° C (1
It is preferable to handle it in a semi-molten state by applying (00 ° C./min or more).

Further, even if it is rapidly heated to about 350.degree. C., once the temperature is lowered, the caking property of the reformed pulverized coal is greatly reduced, so that the temperature of the reformed pulverized coal can be maintained during the transportation process. is necessary. From this point of view, the hot forming apparatuses 1, 11 and 21 described above are created.

In the hot forming method of this embodiment, the semi-molten pulverized coal reformed in the rapid heating step is formed into a formed coal of a predetermined size by using the hot forming apparatuses 1, 11 and 21. The agglomeration step of molding is carried out. That is, when forming the briquette in this agglomeration step, the temperature of the rapidly heated pulverized coal is maintained by the heating means. At the same time, the reforming pulverized coal is forcedly pushed by the pushing means to perform molding. After that, the formed coal that has been agglomerated in the agglomeration step is supplied to the carbonization furnace.

Since the heating device 9 is used as the heating means and the reforming pulverized coal is molded while maintaining the temperature thereof, it is possible to prevent the temperature of the reformed pulverized coal from being lowered during the conveying and molding processes. it can. Therefore, the caking property of the modified pulverized coal is not lowered, and high quality coke can be produced. The heating devices 4a and 5a arranged in the cutting chute 4 and the charging hopper 5, respectively, are expected to have the same effects as the heating device 9.

If the heating device 9 is formed by a heating tube through which a heat medium passes, the temperature of the reformed pulverized coal can be maintained by the heat medium which can be easily secured. For example, hot air comes from a hot stove and steam comes from a dry cooling system (C
It can be easily secured from DQ). Further, if the heating device 9 is formed by an electric heating device and is equipped with a thermostat or the like, the temperature can be easily adjusted.

Further, the pushing means 10 and 2 are used as pushing means.
Since 0 is used, the reformed pulverized coal is forcedly pushed into the molding, so that the reformed pulverized coal having a caking property is forcibly conveyed to the molding position and stable agglomeration is performed. You can This is because the modified pulverized coal having a caking property is less likely to spontaneously fall in the introduction chute 7 due to the adhesion of the molten substance, so that the forming rolls 6 are forcedly forced by the pushing devices 10 and 20.
To be transported to.

Further, as the pushing device 10, if the main pushing device 10a is arranged not only in the central portion of the introducing chute 7 but also the auxiliary pushing device 10b is arranged in the peripheral portion thereof, the dead is caused by the heating device 9. It is possible to reliably guide the reformed pulverized coal that accumulates in the peripheral portion, which tends to become a space, to the forming roll 6. In addition, the pushing device 10, 20
Since it can be formed by a simple device such as a screw conveyor or a chain conveyor, it is highly versatile.

In the hot forming method of this embodiment, when the forming coal is formed in the agglomeration step, the degassing holes 8 are formed.
As a result, the air generated by compaction during the forming of the reformed pulverized coal is allowed to escape to the outside of the introduction chute 7. Therefore, since the reformed pulverized coal is continuously conveyed without hindering the conveyance of the reformed pulverized coal by the space generated by the consolidation, a sound agglomeration can be performed.

As a related technique, Japanese Patent Laid-Open No. 54-81
No. 301 gazette proposes a “coal powder compression molding method”. This publication discloses "a hopper with a built-in screw that press-feeds coal powder to a compression roller", but the present invention relates to a technique for compression-molding ordinary pulverized coal. It is not related to the coke manufacturing process for reforming.

That is, since the present invention is a technique for rapidly heating and reforming coal, a forced pushing device 1 such as a screw conveyor or a chain conveyor is introduced into the introduction chute 7.
It is necessary to dispose 0 and 20, and the two inventions have different technical backgrounds. The present invention also relates to the pushing device 1.
In addition to 0 and 20, the heating device 9 and the deaeration hole 8 are also provided, so that the structure thereof is difficult and the above-mentioned unique and remarkable effect is exhibited.

[0055]

As described above, according to the hot forming apparatus and the hot forming method for the rapid heating pulverized coal according to the present invention, it is possible to facilitate the transportation of the modified pulverized coal having the caking property by the rapid heating. It has an excellent effect that it can be agglomerated soundly and that the temperature of the modified pulverized coal can be prevented from lowering and the quality of coke can be prevented from lowering.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a coke manufacturing process as a technical background of the present invention.

FIG. 2 is a schematic diagram showing the overall configuration of a hot forming apparatus for rapidly heating pulverized coal according to the present invention.

FIG. 3 is a schematic view showing a first embodiment of a hot forming apparatus for rapid heating pulverized coal according to the present invention.

FIG. 4 is a schematic view showing a second embodiment of the hot forming apparatus for rapid heating pulverized coal according to the present invention.

FIG. 5 is a schematic view showing a third embodiment of the hot forming apparatus for rapidly heating pulverized coal according to the present invention.

[Explanation of symbols]

 1,11,21 Hot forming device 2 Rapid heating device 3 Dry distillation furnace 4 Cutting chute 4a, 5a Heating device 4b Cutting valve 5 Charging hopper 6, 6a, 6b Forming roll 7 Introducing chute 8 Deaeration hole 8a Spool pipe 9 Heating device 10 Pushing device 10a Main pushing device 10b Auxiliary pushing device 20 Chain conveyor 20a Chain 20b Pushing piece 22 Cooling prevention cover C Forming charcoal

Claims (13)

[Claims] 1. A hot forming apparatus for rapid heating pulverized coal, which agglomerates pulverized coal in a semi-molten state modified by a rapid heating device with a forming roll and conveys it to a carbonization furnace. And a heating device for maintaining the temperature of the reformed pulverized coal in the introduction chute, the hot forming device for rapid heating pulverized coal. 2. A hot forming apparatus for rapid heating pulverized coal, which agglomerates semi-molten pulverized coal modified by a rapid heating device with a forming roll and conveys it to a carbonization furnace, wherein an introduction chute is provided directly above the forming roll. And a push-in device for forcibly pushing the reformed pulverized coal into the introduction chute. 3. A hot forming apparatus for rapid heating pulverized coal which agglomerates semi-molten pulverized coal modified by a rapid heating device with a forming roll and conveys it to a carbonization furnace. An introduction chute directly above the forming roll. And equipped with a heating device for maintaining the temperature of the reformed pulverized coal in the introduction chute, and equipped with a pushing device for forcibly pushing the reformed pulverized coal Hot forming equipment. 4. The hot forming apparatus for rapidly heating pulverized coal according to claim 1 or 3, wherein the heating device is formed by a heating tube through which a heating medium is passed. 5. The hot forming apparatus for rapidly heating pulverized coal according to claim 1, wherein the heating device is an electric heating device. 6. The pushing device according to claim 2 or 3, wherein the pushing device comprises a main pushing device arranged in a central portion of the introducing chute and an auxiliary pushing device arranged in a peripheral portion thereof. Hot forming equipment for rapid heating pulverized coal. 7. The hot forming apparatus for rapid heating pulverized coal according to claim 2, wherein the pushing device is formed by a screw conveyor. 8. The hot forming apparatus for rapid heating pulverized coal according to claim 2, wherein the pushing device is formed by a chain conveyor. 9. The heat of the rapidly heated pulverized coal according to claim 1, wherein the introduction chute has deaeration holes for letting air generated by compaction of the forming roll escape to the outside. Forming equipment. 10. A method of hot forming pulverized coal in a semi-molten state, which has been modified by a rapid heating step, into a carbonization furnace in the agglomeration step, the method comprising the steps of: A hot forming method for rapidly heating pulverized coal, characterized in that, when the formed coal is formed, the reforming pulverized coal is formed by a heating means while maintaining the temperature of the pulverized coal. 11. A method for hot forming pulverized coal in a semi-molten state, which has been modified in the rapid heating step, to form coal in the agglomeration step and to a carbonization furnace. A hot forming method for rapidly heating pulverized coal, characterized in that, when the formed coal is formed, the pulverized coal is formed by forcing the reformed pulverized coal by a pushing means. 12. A hot forming method for rapidly heating pulverized coal, which comprises supplying pulverized coal in a semi-molten state modified by the rapid heating process to a carbonization furnace in the agglomeration process. A method for hot-molding rapidly heated pulverized coal, characterized in that, when the formed pulverized coal is formed, the temperature of the reformed pulverized coal is maintained by a heating means and the reformed pulverized coal is forcedly pushed by the pushing means. . 13. When forming the formed coal in the agglomeration step,
The hot forming method for rapid heating pulverized coal according to any one of claims 10 to 12, wherein air generated during the forming is degassed to the outside.