JP5182194B2 - High temperature coal charging method - Google Patents

Description

The present invention relates to a high-temperature coal charging method in which high-temperature coal is charged into each carbonization chamber of a coke oven from a charcoal vehicle.

Conventionally, the charging of coal into each carbonization chamber of a coke oven is performed according to the following procedure.
First, the coal truck moving above each coking chamber of the coke oven was moved to the coal loading position of the coal tower provided in the coke oven and stopped, and the coal in the coal tower was juxtaposed to the coal truck. Supply to multiple coal receiving hoppers.
Next, after moving the coal-fed vehicle supplied with coal to above the carbonization chamber into which the coal is charged, from each coal receiving hopper of the coal-carrying vehicle, through a plurality of coal charging inlets provided in the carbonization chamber , And placed in a carbonization chamber under reduced pressure.

Here, there are the following methods for charging coal into each carbonization chamber from a charcoal vehicle.
For example, in Patent Document 1, after most of the coal is charged from two to three coal inlets in the center of the carbonization chamber, the remaining coal is charged from the coal inlets on both sides of the carbonization chamber. A method for preparing for charging coal into the next carbonization chamber to be charged is disclosed.
Further, in Patent Document 2, the inside of the coal receiving hopper of the coal loading vehicle is divided into a plurality of small rooms by a partition plate, and the coal in the coal receiving hopper is removed by a screw feeder attached to the discharge port of the coal receiving hopper. A method is disclosed in which the small chamber is sequentially charged into the carbonization chamber.

JP-A-7-278564 Japanese Patent Laid-Open No. 7-97575

However, in the coal charging methods disclosed in Patent Documents 1 and 2 described above, the charging timing of coal into the carbonization chamber from a plurality of coal charging inlets at least partially overlaps. Using this method, there is no problem when low-temperature wet coal that has been conventionally used is charged into the carbonization chamber, but dry high-temperature coal (particularly, 100 ° C. or more) is charged into the carbonization chamber. In this case, there are the following problems.

The charging of high-temperature coal into the carbonization chamber is performed by cutting out the high-temperature coal in the coal receiving hopper with a screw feeder provided in each of the coal receiving hoppers of the coal-coating vehicle for each carbonizing chamber, and through the coal charging inlets. Do. In addition, a chute connected to the coal charging inlet is provided at the downstream end of each screw feeder, and the hot coal in the chute falls, for example, when the charcoal vehicle is moved at the lower part of the chute. The damper is arranged so as not to.
When charging high-temperature coal into the carbonization chamber from this coal-coating vehicle, each chute is connected to the coal charging inlet, all the dampers are simultaneously opened, and then the screw feeder is driven.

At this time, since hot coal is accumulated in the chute above the closed damper before opening, if all the dampers are opened simultaneously, the accumulated hot coal is charged into the carbonization chamber at the same time. As a result, the gas pressure in the carbonization chamber rises rapidly. As the cause, it is conceivable that the atmospheric temperature in the carbonization chamber is as high as about 1000 ° C., and that the high temperature coal contacts the floor surface in the carbonization chamber at the beginning of charging of the high temperature coal.
For this reason, at the beginning of charging of high-temperature coal, more high-temperature coal is gasified, the gas pressure in the carbonization chamber rises rapidly, and as a result, the reduced-pressure carbonization chamber temporarily becomes a positive pressure state, There was a risk of smoke from the carbonization chamber.

The present invention has been made in view of such circumstances, and when charging high-temperature coal into a carbonization chamber through a plurality of coal inlets from a coal-loaded vehicle, a rapid increase in gas pressure in the carbonization chamber is suppressed, and carbonization is performed. It aims at providing the charging method of the high temperature coal which prevents the smoke from a room.

The gist of the present invention made to solve the above problems is as follows.
(1) A high temperature coal in a plurality of coal receiving hoppers arranged in parallel on a coal-coating vehicle moving above a plurality of carbonizing chambers is provided for each of the carbonizing chambers by a screw feeder provided in each of the plurality of coal receiving hoppers. Cut out and installed in the reduced-pressure carbonization chamber from a plurality of coal charging inlets provided in the carbonization chamber through a chute provided at the downstream end of each screw feeder and having a damper disposed in the lower portion thereof. A method for charging high temperature coal,
The screw feeders are closed after the dampers are sequentially opened at predetermined time intervals and the high temperature coal deposited in the chute above the dampers is charged into the carbonization chamber. And the high temperature coal in each of the coal receiving hoppers is charged into the carbonization chamber.

(2) The high temperature coal charging method according to (1), wherein each of the dampers is sequentially opened at intervals of 3 seconds or more and 10 seconds or less.
(3) The high temperature coal charging method according to (1) or (2), wherein the temperature of the high temperature coal in the coal receiving hopper is 100 ° C. or higher and 350 ° C. or lower.

The high temperature coal charging method according to the present invention sequentially opens each damper in the closed state at a preset time interval, and charges the high temperature coal deposited in the chute above each damper into the carbonization chamber. The timing of gasification of high-temperature coal can be shifted, and a rapid increase in gas pressure in the carbonization chamber can be suppressed.
And after finishing the process of charging all the high-temperature coal deposited in each chute into the carbonization chamber, each screw feeder is driven and the high-temperature coal in each coal receiving hopper is charged into the carbonization chamber. The charging timing of the high-temperature coal accumulated in the chute and the high-temperature coal in the coal receiving hopper cut out by the screw feeder into the carbonization chamber can be shifted, and a rapid increase in gas pressure in the carbonization chamber can be suppressed.
Accordingly, when high temperature coal is charged into the carbonization chamber from the coal loading vehicle via the plurality of coal charging ports, a rapid increase in gas pressure in the carbonization chamber can be suppressed, so that smoke from the carbonization chamber can be prevented.

It is explanatory drawing of the charging method of the high temperature coal which concerns on one embodiment of this invention. (A) is explanatory drawing which shows the gas pressure fluctuation | variation in the carbonization chamber at the time of using the charging method of the high temperature coal which concerns on a prior art example, (B) is the charging method of the high temperature coal which concerns on one embodiment of this invention. It is explanatory drawing which shows the gas pressure fluctuation | variation in the carbonization chamber at the time of using. It is explanatory drawing which shows the relationship between the space | interval of the opening time of a damper, and the maximum gas pressure in a carbonization chamber.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
First, a charging apparatus to which a high temperature coal charging method according to an embodiment of the present invention is applied will be described, and then a high temperature coal charging method will be described.
As shown in FIG. 1, the coke oven 10 has a plurality of carbonization chambers 11 (showing a partial cross section of one carbonization chamber in FIG. 1), and a combustion chamber (shown in the figure) between adjacent carbonization chambers 11. Not).

In the upper part of each carbonization chamber 11, a plurality of (for example, 3 to 5 and 5 in this case) coal charging inlets 12 to 16 are provided from the front side (one side) to the back side (the other side) of the carbonization chamber 11. ) And are arranged side by side with an interval.
Further, a rising pipe (an example of a gas suction unit) 18 connected to the dry main 17 is provided on the upper front side (side) of each carbonization chamber 11. The riser pipe 18 has an ejector function, and the furnace gas generated in the carbonization chamber 11 can be forcibly discharged to the dry main 17. The riser 18 is provided with a pressure gauge 19 for measuring the gas pressure in the carbonization chamber 11.

On the upper part of the coke oven 10, a coal loading vehicle 21 (also referred to as a moving machine) on which high-temperature coal 20 is mounted is disposed so as to be movable above each carbonization chamber 11.
A plurality of (here, five) coal receiving hoppers 22 to 26 that store the high-temperature coal 20 are provided side by side with a gap from the front side to the back side of the carbonization chamber 11 in the coal loading vehicle 21. ing. Screw feeders 27 to 31 are provided at the downstream ends of the coal receiving hoppers 22 to 26, respectively, and chutes 32 to 36 are provided at the downstream ends of the screw feeders 27 to 31, respectively.

The positions of the lower ends of the chutes 32 to 36 correspond to the arrangement positions of the coal inlets 12 to 16 in the carbonization chamber 11, and the chutes 32 to 36 can be attached to and detached from the coal inlets 12 to 16, respectively. It has a configuration.
In addition, dampers 37 to 41 that can be opened and closed are provided in the lower portions of the chutes 32 to 36, respectively.
Thereby, after connecting each chute | shoot 32-36 to the coal charging inlets 12-16, and making each damper 37-41 open state, each coal feeder hopper 22-26 is driven by driving each screw feeder 27-31. The high temperature coal 20 inside can be charged into the carbonization chamber 11.

Subsequently, a high temperature coal charging method according to an embodiment of the present invention will be described.
As shown in FIG. 1, the high temperature coal charging method according to an embodiment of the present invention includes a high temperature in each of the coal receiving hoppers 22 to 26 provided side by side in the coal loading vehicle 21 in each of the plurality of carbonizing chambers 11. The coal 20 is cut out by screw feeders 27 to 31 provided in the coal receiving hoppers 22 to 26, and charged into the carbonization chamber 11 in a reduced pressure state from the coal charging inlets 12 to 16 through the chutes 32 to 36, respectively. It is a method to do. This will be described in detail below.

First, see FIG. 2 (A) and FIG. 2 (B) for the results of investigating the gas pressure fluctuations in the carbonization chamber when high temperature coal having a temperature of 200 ° C. is charged into the carbonization chamber in a reduced pressure state from five coal inlets. While explaining. The chamber volume of the carbonization chamber is 44 m ³ , and the high temperature coal charged into the carbonization chamber is 1 ton (200 kg × 5 coal receiving hoppers), and the pressure measurement of the gas pressure in the carbonization chamber is performed in the pressure in the riser pipe. A total of 19 were performed.
Conventionally, when charging high temperature coal, the dampers provided on each chute have been opened simultaneously. As a result, as shown in FIG. 2 (A), the gas pressure in the carbonization chamber increased rapidly, the carbonization chamber in the reduced pressure state temporarily became a positive pressure state, and smoke generation from the carbonization chamber was confirmed.

Thus, when all the dampers are opened simultaneously, the high-temperature coal deposited in the chute above each damper is charged simultaneously into the carbonization chamber. Since this high-temperature coal has a temperature of about 200 ° C., when it is charged into a carbonization chamber having a room temperature of about 1000 ° C., the reason described above (the atmosphere temperature in the carbonization chamber is high. High temperature coal is easily gasified from high temperature coal in contact with the furnace bottom in the carbonization chamber.
For this reason, when the dampers are simultaneously opened, the high-temperature coal deposited in the chute above the damper is simultaneously charged into the carbonization chamber and gasified, causing a rapid increase in gas pressure in the carbonization chamber. .

Therefore, in the present embodiment, the closed dampers 37 to 41 are sequentially opened at preset time intervals (here, 5 second intervals) and placed in the chutes 32 to 36 above the dampers 37 to 41. First, a step of charging the accumulated high-temperature coal 20 while shifting the charging start time is performed first without charging the carbonized chamber 11 simultaneously. Thereby, after all the high temperature coal 20 accumulated in each chute | shoot 32-36 is inserted in the carbonization chamber 11, each screw feeder 27-31 is driven continuously, and the high temperature in each coal receiving hopper 22-26 is carried out. Coal 20 is charged into the carbonization chamber 11.
By sequentially opening the dampers 37 to 41 in the closed state at predetermined time intervals, as shown in FIG. 2B, the carbonization in the carbonization chamber 11 is not rapidly increased without causing a rapid increase in the gas pressure. The inside of the chamber 11 could always maintain a reduced pressure state.

Here, it is preferable that each damper is sequentially opened at intervals of 3 seconds or more and 10 seconds or less.
This will be described with reference to FIG. FIG. 3 shows the results obtained under the same operating conditions as those in the case where the gas pressure fluctuation in the carbonization chamber in FIG. 2B was investigated except that the interval at which the damper was opened was changed. In FIG. 3, the damper opening time interval of 0 second means that all dampers are opened simultaneously.

As shown in FIG. 3, when the interval for opening each damper is less than 3 seconds, the gas pressure tends to increase rapidly. This is considered to be because the intervals at which the dampers are opened are too short, and the gas pressure rise times overlap when the dampers are opened.
On the other hand, when the interval exceeds 10 seconds, the interval is too long, and the time required for charging the high-temperature coal into all the carbonization chambers becomes long, resulting in a decrease in work efficiency. For this reason, in FIG. 3, the measurement of the gas pressure is stopped around 8 seconds when the gas pressure becomes substantially constant.
Therefore, the time interval for opening each damper is set to 3 seconds or more and 10 seconds or less, but the upper limit is preferably 7 seconds, and more preferably 5 seconds. The intervals may be the same or different. Further, the opening order may be any order.

Moreover, when the temperature of the high temperature coal 20 in each of the coal receiving hoppers 22 to 26 is set to 100 ° C. or more and 350 ° C. or less, the effect of suppressing a rapid increase in gas pressure becomes remarkable. This is because if the temperature of the high-temperature coal 20 charged into the carbonization chamber 11 is increased, gasification is facilitated.
Accordingly, the temperature of the high-temperature coal 20 in each of the coal receiving hoppers 22 to 26 is set to 100 ° C. or more and 350 ° C. or less, but the lower limit is set to 150 ° C., and further to 200 ° C., the above-described effects become more remarkable. .
And the drive of each screw feeder 27-31 performed after finishing the process which makes the dampers 37-41 an open state sequentially, and all the dampers 37-41 will be in an open state may be simultaneous, but it is preferable to perform sequentially.

If charging of the high-temperature coal 20 into the carbonization chamber 11 is completed by the above operation, the screw feeders 27 to 31 are stopped simultaneously or sequentially, and then the dampers 37 to 41 are closed.
Thereby, since the charging of the high-temperature coal 20 into the carbonization chamber 11 is completed, each chute 32 to 36 is removed from the coal charging inlets 12 to 16, and the coal loading vehicle 21 and then the other high-temperature coal 20 are charged. Move to the carbonization chamber 11 and repeat the above operation.
Thereby, when charging the high temperature coal 20 into each carbonization chamber 11 from the coal loading vehicle 21 via the plurality of coal charging ports 12 to 16, the rapid increase in gas pressure in the carbonization chamber 11 is suppressed, and carbonization is performed. Smoke from the chamber 11 can be prevented.

Next, an example performed for confirming the effects of the present invention will be described with reference to FIG.
The carbonization chamber 11 into which the high-temperature coal 20 is charged has an indoor volume of 44 m ³ , and five coal charging inlets 12 to 16 are provided at the upper portion of the carbonization chamber 11 from the front side to the back side of the carbonization chamber 11. And arranged side by side at intervals. In addition, the furnace temperature of the carbonization chamber 11 was set to about 1000 to 1100 ° C.
Various high-temperature coals having different temperatures are inserted into the carbonization chamber 11 while changing the order and intervals of opening the dampers, and the gas pressure in the carbonization chamber 11 is measured by a pressure gauge 19 in the riser 18. At the same time, the presence or absence of outflow of gas in the furnace from the carbonization chamber 11 was investigated.
The results are shown in Table 1.

In Table 1, the total amount of high-temperature coal charged in the hopper is the total amount of high-temperature coal deposited in the chutes 32 to 36 above the five dampers 37 to 41 and charged into the carbonization chamber.
Moreover, the number described in the order of opening of the damper means the number of each coal receiving hopper 22 to 26 shown in FIG. Here, the “arrow” between the numbers means the order of the coal receiving hoppers that open the damper, and “,” means that the dampers of the respective coal receiving hoppers are opened simultaneously.
As for the presence or absence of outflow of gas in the furnace, the case where white smoke could not be visually confirmed was set to “No”, and the case where it was confirmed was set to “Yes”.

In each of Examples 1 to 5 in Table 1, the dampers 37 to 41 in the closed state provided in the coal receiving hoppers 22 to 26 are sequentially opened at predetermined time intervals (2 to 8 seconds). This is the result.
On the other hand, in the comparative example, the dampers 37 to 39 in the closed state of the coal receiving hoppers 22 to 24 are simultaneously opened, and after 4 seconds, the dampers 40 in the closed state of the coal receiving hoppers 25 and 26, This is the result when 41 is opened simultaneously.
Table 1 also shows the results when the dampers 37 to 41 in the closed state of the coal receiving hoppers 22 to 26 are simultaneously opened as a conventional example.

As is clear from Examples 1 to 5, the dampers 37 to 41 of the coal receiving hoppers 22 to 26 are sequentially opened to greatly increase the maximum pressure of the in-furnace gas as compared with the comparative example and the conventional example. It was possible to reduce it and to confirm that the outflow of gas in the furnace could be almost eliminated.
In Example 5, since the opening interval of the damper fell below the lower limit of the optimum range (3 seconds or more), the gas in the furnace slightly flowed out, but the amount was not problematic. On the other hand, the outflow of the in-furnace gas could be prevented by setting the opening interval of the damper within the optimum range as in Examples 1 to 4.

Moreover, although Example 1, 3, 4 is a result of having changed variously the opening order of each damper 37-41 of each coal receiving hopper 22-26, all can make the maximum pressure of in-furnace gas low. There was no outflow of gas in the furnace. From this, it has been confirmed that the fluctuation of the maximum pressure of the in-furnace gas and the outflow of the in-furnace gas are not affected by the order of opening the dampers 37 to 41 of the coal receiving hoppers 22 to 26.
From the above, it was confirmed that by using the high temperature coal charging method of the present invention, it was possible to suppress a rapid increase in gas pressure in the carbonization chamber and to suppress and further prevent smoke from the carbonization chamber. .

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, the case where the high temperature coal charging method of the present invention is configured by combining a part or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.

10: Coke oven, 11: Carbonization chamber, 12-16: Coal charging inlet, 17: Dry main, 18: Rise pipe, 19: Pressure gauge, 20: High-temperature coal, 21: Charcoal vehicle, 22-26: Receiving hopper 27-31: Screw feeder, 32-36: Chute, 37-41: Damper

Claims (3)

High-temperature coal in a plurality of coal receiving hoppers arranged in parallel on a coal-coating vehicle moving above a plurality of carbonizing chambers is cut out for each of the carbonizing chambers by screw feeders respectively provided in the plurality of coal receiving hoppers, High temperatures that are respectively charged into the decompressed carbonization chamber from a plurality of coal inlets provided in the carbonization chamber via a chute provided at the downstream end of each screw feeder and having a damper disposed below the screw feeder. A method of charging coal,
The screw feeders are closed after the dampers are sequentially opened at predetermined time intervals and the high temperature coal deposited in the chute above the dampers is charged into the carbonization chamber. And the high temperature coal in each of the coal receiving hoppers is charged into the carbonization chamber. 2. The high temperature coal charging method according to claim 1, wherein the dampers are sequentially opened at intervals of 3 seconds to 10 seconds. 3. The high temperature coal charging method according to claim 1, wherein the temperature of the high temperature coal in the coal receiving hopper is 100 ° C. or more and 350 ° C. or less. Coal charging method.

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