JP2571444B2 - Operating method of coke dry fire extinguishing equipment - Google Patents

Description

The present invention relates to a coke dry fire extinguishing system that minimizes fluctuations in the amount of coke cut out from the cooling tower and the amount of recovered steam even when troubles such as taking out the coke kiln occur. The present invention relates to a method for operating a coke dry-type fire extinguishing system which can be suppressed to a minimum.

Conventional technology Red hot coke discharged from a coke oven has been sprayed and extinguished in the past.However, the immense amount of heat held by the red hot coke is released into the atmosphere, and dust generated by the water vapor generated during sprinkling fire extinguishing. Scattered around the surrounding area, causing pollution problems.

For this reason, in recent years, coke dry fire extinguishing equipment that has many advantages such as being able to recover sensible heat possessed by red-hot coke, preventing scattering of dust, and improving coke strength and reducing moisture has been adopted in recent years.

In addition to the above, the coke dry fire extinguishing system has the advantage that flammable gas components such as methane, hydrogen and carbon monoxide remaining in red hot coke and combustible gas components such as carbon monoxide generated by combustion of coke can be recovered and used. have.

On the other hand, implementing a coke dry fire extinguishing system has the disadvantage that the yield of lump coke is reduced due to coke powdering and coke combustion.

Conventionally, a coke dry fire extinguishing system has a plurality of coke ovens with a processing capacity of 30 to 50 t / h per coke oven group.
Recently, one with a processing capacity of about 100 to 200 t / h
A large coke dry fire extinguishing system is adopted because the provision of one furnace group not only reduces construction costs but also facilitates operation.

FIG. 1 shows an example of a coke dry fire extinguishing system, in which glowing coke discharged from a coke oven (not shown) is loaded on a coke bucket (1) mounted on a bucket truck, and is driven by a hoist (2). It is wound up on the upper part of the cooling tower (3) and is charged into the pre-chamber (4) from the upper part.

The red hot coke put into the pre-chamber (4)
The lower cooling device (8) is cooled down by contacting with a circulating cooling gas composed of an inert gas such as nitrogen blown from a lower blast head (7) by a circulating fan (6). Is cut out by On the other hand, the circulating gas that has become hot due to contact with the red hot coke is dust-removed in the flue (9), introduced into the heat exchanger (10), cooled by heat exchange, and then cooled in the cyclone (11). And is blown into the cooling chamber (5) by the circulation fan (6). The high-temperature, high-pressure recovered steam heated by heat exchange in the heat exchanger (10) is sent to a turbine generator or the like (not shown).

This coke dry fire extinguishing system is equipped with a pre-chamber (4)
The coke cut-out amount is set so that the stock level in the container maintains a predetermined level.

On the other hand, since the kiln discharging operation of the coke oven is performed discontinuously, one kiln of red-hot coke is charged into the pre-chamber (4) at a pitch of 7 to 9 minutes during the kiln discharging operation. However, no red hot coke is supplied during the interruption of the kiln discharge (1-2 hours).

Therefore, the inventory level in the pre-chamber (4)
The coke cutting amount is controlled so as to reach the upper limit level at the completion of the coke oven work. Then, while the kiln is interrupted, that is, while the coke is not charged, the stock level is sequentially reduced, and the coke cutting amount is controlled so as to reach the lower limit level at the time when the next kiln starting operation is started. By introducing combustible gas components into the flue and introducing air into the flue to combust, fluctuations in the amount of recovered steam are suppressed to a minimum, and the range of fluctuations in the amount of coke cut is reduced.

However, if the capacity of the pre-chamber is increased in accordance with the amount of coke supplied during one kiln discharging operation, the coke cutting amount can be made uniform, but the construction cost becomes enormous.

For this reason, the amount of coke cut out during the kiln removal operation is usually increased and reduced during the interruption, but it is inevitable that the amount of recovered steam fluctuates during and after the kiln removal operation.

If the coke cannot be discharged due to a trouble in the coke oven, for example, a failure of the extruder, the coke cutting amount is adjusted in accordance with the stock level. As shown, the stock level of the pre-chamber (4) falls below the lower limit. For this reason, the coke cutting is stopped, the circulation of the cooling gas is stopped, and the air is stopped, so that the generation of the recovered steam is stopped. On the other hand, due to the failure of the cooling coke cutting device (8) or the failure of the belt conveyor, etc.
When the cooling coke is cut off, the red hot coke is continuously supplied while monitoring the stock level of the pre-chamber (4), but when the upper limit level is reached, the kiln discharging is temporarily stopped or watering is extinguished. That is, it is necessary to switch to wet fire extinguishing and continue the kiln discharging, or to put the coke dry extinguishing equipment of another furnace group.

Conventionally, only during the planned outage of the coke dry fire extinguishing system, part of the coke extruded from the coke oven subject to the stall is injected into the operating coke dry extinguishing system, and the amount of steam recovered temporarily is reduced. Was trying to rise.

SUMMARY OF THE INVENTION The present invention relates to a method for operating a coke dry fire extinguishing system in the above coke dry extinguishing system, which can reduce the fluctuation range of the coke cutting amount when a coke kiln discharge trouble occurs, and can also make the recovered steam amount almost uniform. The purpose is to provide.

Means for Solving the Problems The present inventors, in the coke dry fire extinguishing equipment,
As a result of intensive studies and research on equalizing the amount of coke cut and the amount of recovered steam, if the coke is constantly discharged at regular time intervals, the amount of coke cut and the amount of recovered steam can be made uniform. Difficult to implement. On the other hand, in a normal coke oven, it is rare that only one furnace group is independently installed, and a plurality of furnace groups are connected and installed. This is an advantage that if multiple furnace groups are connected and installed, the coal tower can be shared, and in the case of failure of the extruder, coal-charging truck, coke guide truck, coke bucket truck, etc., the one of the neighboring furnace batch can be used. Because there is.

The present inventors have found that in a coke oven in which a plurality of gangs are connected in series, the firing operation of each gang is rarely performed simultaneously. Focusing on the fact that the kiln of the specified furnace group is being carried out, and during the kiln work of the specified furnace group, when the red hot coke of the specified furnace group can not be input to the corresponding coke dry-type fire extinguishing equipment due to the kiln removal trouble By injecting a predetermined amount of red hot coke from another furnace group, it was possible to stabilize the amount of recovered steam, and it was further investigated that the amount of coke cut out could be optimized and stabilized.

That is, the present invention relates to a coke oven group in which a plurality of coke ovens are connected and provided with at least one coke dry fire extinguishing system. While taking into account the schedules, without lowering the lower limit level of the pre-chamber, calculate the number of red hot coke that should be supplied from other coke ovens to minimize the fluctuation range of the current coke cutting amount. Then, based on the calculation result, red hot coke of another furnace group is injected to suppress fluctuations in the amount of recovered steam.

In a coke plant where multiple furnaces are connected in series, it is rare to carry out the kiln work for each coke furnace at the same time. The group is discontinuing the kiln. Therefore, even if a kiln discharge trouble occurs in one coke oven group and the kiln discharge of red hot coke is temporarily impossible, the lower limit level is maintained from the inventory amount of each prechamber and the other kiln discharge schedule, In addition, in order to minimize the fluctuation range of the current coke cut-off amount, a prediction calculation is performed as to how many red hot coke should be supplied from the other coke oven, and the red heat of the other oven is calculated based on the calculation result. Coke is injected at a predetermined time.

Effect In the kiln work of a coke oven group in which multiple furnace groups are connected in series, if it becomes impossible to put red hot coke into the coke dry fire extinguishing system due to trouble in the kiln, etc., the corresponding coke dry fire extinguishing system Considering the pre-chamber inventory and the kiln discharge schedule mutually, without lowering the lower limit of the pre-chamber, the number of red hot cokes from other coke ovens can be minimized to minimize the fluctuation range of the current coke discharge amount. Let me calculate what to do,
Based on the calculation result, red hot coke from another furnace group was injected to suppress fluctuations in the amount of recovered steam, so even if it became impossible to input red hot coke to the pre-chamber due to kiln discharge trouble etc. The red-hot coke from the other coke ovens is injected so that the pre-chamber stock level does not fall below the lower limit, and the fluctuation range of the current coke cut-off amount is minimized, thereby suppressing fluctuations in the amount of recovered steam. In addition, the stock level of the pre-chamber does not fall below the lower limit level, and the fluctuation range of the coke cutting amount can be minimized.

Example Comparative example Two coke ovens consisting of a 92 coke oven and a 87 coke oven with a furnace height of 7125 mm are installed in series, and each coke oven has one coke dry fire extinguishing system. in installed by being coke plant, the conventional method to introduce only red hot coke appropriate oven groups kiln out when trouble occurs in the case of the coke dry quenching method of the pre-chamber a Rodin (between T ₁ through T ₂₎ FIG. 3 shows an example of a change with time in the stock amount, the coke cutout amount, and the recovered steam amount.

As shown in FIG. 3, during the coke kiln discharge operation, that is, while red hot coke is being charged, the stock amount of the pre-chamber is gradually increasing, and the coke cut-out amount is large, and the recovered steam amount is accordingly large. . However, during the kiln unloading when red hot coke is not charged, the stock level of the pre-chamber is gradually decreasing, despite the reduced coke cutting amount, and the amount of recovered steam also decreases accordingly, It is impossible to keep the amount of coke cut and the amount of recovered steam constant. In addition, when a trouble occurs in the kiln discharge, the coke cutting is stopped and the blowing of the circulating gas is stopped so that the stock level of the pre-chamber is kept at the lower limit position, so that the generation of the recovered steam is stopped.

In Example the same coke plant, when kiln out trouble occurred (between T ₃ through T ₄₎ in the coke oven group of B furnace group,
The pre-chamber stock level maintains the lower limit position, calculates the amount of red hot coke necessary to minimize the fluctuation range of the coke cut-out amount, and inputs red hot coke from the furnace A based on the calculation result (T ₅ ~T between _6), and suppress variations in recovery steam amount. FIG. 4 shows an example of such a case.

As shown in FIG. 4, the amount of recovered steam is almost constant, and the prechamber inventory level is maintained at an appropriate level, that is, within the range of the upper limit level and the lower limit level. Did not.

Effect of the Invention According to the method of the present invention, even when it becomes impossible to input red-hot coke due to a kiln discharging trouble, the stock of the pre-chambers of both coke dry-type fire extinguishing equipments from other coke oven groups during the kiln discharging operation. However, it does not fall below the lower limit level and predicts and calculates the amount of red hot coke necessary to minimize the fluctuation range of the current coke cutting amount, and based on the calculation result, the red hot coke of another furnace group is injected. ,
The fluctuation range of the coke cutting amount and the recovered steam amount can be suppressed to a minimum. In addition, there are many advantages such as no need to stop the wind.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a coke dry fire extinguishing system,
FIG. 2 is an explanatory view showing an example of changes in the stock level of the pre-chamber, the amount of circulating gas, the amount of coke cut off, and the amount of recovered steam when a coke oven trouble occurs in a conventional coke oven, and FIG. 3 shows a comparative example. FIG. 4 is an explanatory diagram of changes in the pre-chamber stock level, coke cutout amount, and recovered steam amount, and FIG. 4 is an explanatory diagram of changes in the prechamber stock level, coke cutout amount, and recovered steam amount in the embodiment. DESCRIPTION OF SYMBOLS 1 ... Coke bucket, 2 ... Winding machine, 3 ... Cooling tower, 4 ... Prechamber, 5 ... Cooling room, 6 ... Circulation fan, 7 ... Blast head, 8 ... Cutting device, 9 ... … Flue, 10… boiler, 11… cyclone,

Claims (1)

(57) [Claims] In a coke oven group having at least one coke dry fire extinguishing facility in which each coke oven group in which a plurality of oven groups are connected is provided, a pre-chamber inventory amount and a kiln discharge schedule when a coke kiln discharge trouble occurs. While taking into account each other, do not cut the lower limit level of the pre-chamber, calculate how many red hot coke should be fed from other coke ovens to minimize the fluctuation range of the current coke cutting amount, and A method for operating a coke dry fire extinguishing system, characterized by charging red-hot coke of another furnace group based on a calculation result and suppressing fluctuations in the amount of recovered steam.