JP2571443B2 - Operating method of coke dry fire extinguishing equipment - Google Patents

Description

The present invention relates to a coke dry extinguishing system, in which the variation in the cut-out amount of the cooled coke is small, and the coke can increase and stabilize the steam recovery amount. The present invention relates to a method for operating a dry fire extinguishing system.

Conventional technology Red hot coke discharged from a coke oven has been sprayed and extinguished in the past.However, the huge amount of heat possessed by red hot coke is released into the atmosphere, and dust is entrained by water vapor generated during sprinkling and extinguishing. It had problems such as scattering around the surrounding suburbs and 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.

The coke dry fire extinguishing system collects flammable gas components such as methane, hydrogen, and carbon monoxide remaining in red-hot coke in addition to the above advantages, and combustible gas components such as carbon monoxide generated by coke combustion. Has the advantages available.

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

Conventionally, multiple coke dry fire extinguishing systems with a processing capacity of 30 to 50 t / h per coke oven group have been installed, including one spare, since boilers are required to conduct annual government inspections. Was.

However, recently, it is not only low in construction cost to install one with a processing capacity of about 100 to 200 t / h per furnace group, but also the operation becomes easy. Many facilities are being constructed.

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 yellow chamber (4) from the upper part.

The glowing coke introduced into the pre-chamber (4)
The cooling fan (5) descends sequentially and is cooled by being brought into contact with a circulating cooling gas comprising an inert gas such as nitrogen blown from a lower blast head (7) by a circulation fan (6), and a lower cutting device (8). On the other hand, the circulating gas that has become hot due to contact with the red hot coke is removed by a flue (9), then introduced into a boiler (10), cooled by heat exchange, and then cooled by a cyclone ( 11)
The dust is removed again in the cooling chamber (5) by the circulation fan (6).
Blown into. The recovered steam, which has been heated and exchanged in the boiler (10) to have a high temperature and a high pressure, is sent to a turbine generator or the like (not shown) for use.

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 to reach the upper limit level at the time of completion of the kiln discharge operation of the coke oven, and the stock level is sequentially reduced while the kiln discharge is interrupted, that is, while the coke is not charged, the next kiln discharge operation is started. It manages to reach the lower limit level at the time, making uniform the amount of recovered steam and suppressing fluctuations in the amount of coke cut off.

However, if the capacity of the pre-chamber is increased according to the amount of coke cut out during a single kiln discharge,
The amount of coke cut can be made uniform, but the construction cost becomes expensive.

For this reason, the amount of coke cut off during the kiln discharge operation is usually increased, and the amount of coke is reduced during intermittent operation, while combustible gas components remaining in the input red hot coke and the combustible gas generated by coke combustion in the system The gas components are burned by introducing air during the interruption, and the amount of recovered steam is made uniform. However, it is inevitable that the gas components fluctuate during the kiln discharge operation and during the interruption.

In addition, if the coke oven operation is constantly performed at regular time intervals, the coke cutout amount and the recovered steam amount can be made uniform, but such an operation method is difficult to implement.

Problems to be Solved by the Invention The present invention provides a coke dry-type fire extinguishing system that does not require a large change in the coke cut-off amount during and after intermittent operation of the coke kiln, and also suppresses fluctuations in the amount of recovered steam. It is an object of the present invention to provide a method for operating a dry fire extinguishing system.

Means for Solving the Problems The present inventors, in the coke dry fire extinguishing equipment,
As a result of diligent research on suppressing fluctuations in the coke cut-off amount and the recovered steam amount, it is rare that a single coke oven is usually installed independently, and many coke ovens are usually connected in series. Is being done. In addition, the firing of each furnace group is rarely performed at the same time. Usually, while one furnace group is performing the firing operation, the other furnace group is often interrupted. Therefore, in order not to fluctuate the amount of coke cut off during the interruption, it was found that red-hot coke should be supplied from the furnace group during the kiln discharging operation to the coke dry-type fire extinguishing equipment of the interrupted furnace group. did.

That is, the present invention provides a coke oven group having at least one coke dry fire extinguishing facility, in which each coke oven group in which a plurality of coke ovens are connected in series is provided with a heat recovery capacity, a heat recovery efficiency, and a heat recovery efficiency of each coke dry fire extinguishing equipment. Based on the time variation of the pre-chamber stock, red hot coke is alternately charged into each coke dry-type fire extinguishing facility during the kiln discharge operation of each furnace group, and the coke cut-out amount and the steam recovery amount are kept constant.

Based on the heat recovery capacity and heat recovery efficiency of each coke dry fire extinguishing facility, the coke stock of each prechamber, and the kiln discharge schedule of each coke oven, the temporal fluctuation of the stock quantity of each prechamber is predicted, and each coke dry fire extinguishing facility In order to keep the amount of coke extracted from the coke from changing, the red hot coke is put into each coke dry-type fire extinguishing equipment while the coke ovens are being discharged, that is, the red hot coke for one kiln is alternately charged, or the red hot coke for multiple kilns After charging coke into one coke dry-fire extinguishing system, add red hot coke for multiple kilns to the other coke dry-type fire extinguishing system, or add one coke to one of the coke dry-type fire extinguishing systems according to the stock amount in the pre-chamber of each coke dry-type fire extinguishing system. Kilns can be alternately charged with multiple kilns on the other side.

In the present invention, in the coke dry-type fire extinguishing equipment of a coke oven in which a plurality of coke ovens are connected in series, when the coke ovens are taken out of the kiln, the pre-chamber stock of each coke dry-type fire extinguishing equipment and the coke cut-off amount are corresponded. Since red hot coke is injected into each other, there is no need to greatly vary the amount of coke cut off from the coke dry fire extinguishing equipment.
Fluctuations in the amount of recovered steam can be suppressed.

In addition, since the amount of red hot coke charged to each prechamber is set in accordance with the heat recovery capacity and heat recovery efficiency of each coke dry fire extinguishing system, the recovered steam is also maximized.

Examples Example 1 In a coke oven group in which a plurality of coke ovens consisting of 92 coke ovens (furnace A) and 87 (furnace B) with a furnace height of 7125 mm are connected in series, each coke dry process was performed. From the heat recovery capacity and heat recovery efficiency of the fire extinguishing equipment, the stock volume of each pre-chamber and the amount of coke cut-out, and the kiln discharge schedule of each coke oven group, the stock level of each pre-chamber is within the upper and lower limits, and Prediction calculation was performed so as not to change the cut-out amount, and based on the result, red-hot coke was alternately charged from each coke oven. In this case, alternate coke charging conditions, coke cut-off amount, prechamber stock amount, and fluctuations in the recovered steam amount were measured. The result is shown in FIG.

As shown in FIG. 2, the coke cut-off amount did not fluctuate in the dry fire extinguishing equipment of any coke oven.
The pre-chamber inventory also holds a predetermined level,
Moreover, the fluctuation of the recovered steam amount is very small.

Example 2 In the same coke oven group as in Example 1, a pre-chamber in which red-hot coke was alternately charged for each kiln into a pre-chamber of each coke dry-type fire extinguishing equipment during the kiln discharging operation and the coke cut-out amount was constant. Inventory and recovered steam were measured. FIG. 3 shows the results.

As shown in FIG. 3, the recovered steam amount becomes substantially constant, and the pre-chamber inventory level has less fluctuation than in the first embodiment. This means that in Example 2,
This shows that the same effect as that obtained by performing the kiln discharging operation at predetermined time intervals is obtained.

Comparative Example In the same coke oven group as in the first embodiment, an example of the change with time of the prechamber stock level, the coke cutout amount, and the recovered steam amount in the case of the conventional method in which only the red hot coke of the corresponding furnace group is introduced is shown in FIG. Shown in

As shown in Fig. 4, while the coke oven is being discharged, that is, while red hot coke is being charged, the stock level of the pre-chamber is gradually increasing, and the coke cutoff amount is large, and the recovered steam amount is accordingly increased. There are many. However, during the kiln outage where red hot coke is not charged, the stock level of the pre-chamber is gradually decreasing and the amount of recovered steam is also decreasing, despite the fact that the amount of coke cut is reduced. It was impossible to make the amount of cut-out and the amount of recovered steam constant.

Effects of the Invention According to the method of the present invention, in a coke oven group in which a plurality of coke ovens are connected in series, one of the coke ovens according to the stock amount of the pre-chamber of each coke dry-type fire extinguishing equipment corresponding to each coke oven coke. While the group is out of the kiln and the other is interrupted,
Since the red hot coke from the kiln of one of the furnace groups is mutually charged into each pre-chamber, the red hot coke is supplied to each pre-chamber even when the kiln discharge is interrupted. That is, the optimal efficiency operation according to the heat recovery capacity and the heat recovery efficiency of each coke dry fire extinguishing equipment becomes possible, and as a result, the total amount of recovered steam can be maximized. In addition, in each coke dry fire extinguishing system, if red hot coke is alternately charged for each kiln, it is possible to continuously input red hot coke at predetermined time intervals, which is ideal for coke dry fire extinguishing equipment. Is stable, and high efficiency operation can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of a coke dry fire extinguishing system,
FIG. 2 shows the prechamber stock level in the first embodiment,
FIG. 3 is an explanatory diagram of the change over time of the coke cutoff amount and the recovered steam amount. FIG. 3 is an explanatory diagram of the change over time of the prechamber stock level, the coke cutout amount, and the recovered steam amount according to the second embodiment.
The figure is an explanatory diagram of the change over time of the prechamber stock level, the coke cutout amount, and the recovered steam amount in the comparative example. DESCRIPTION OF SYMBOLS 1 ... Coke bucket, 2 ... Hoisting machine, 3 ... Cooling tower, 4 ... Prechamber, 5 ... Cooling chamber, 6 ... Circulation fan, 7 ... Blast head, 8 ... Cutting device, 9 ... … Flue, 10… boiler, 11… cyclone,

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Shimooka 3, Kajima-cho, Kashima-gun, Ibaraki Prefecture Inside Kashima Works, Sumitomo Metal Industries Co., Ltd. Sumitomo Metal Industries, Ltd. Kashima Works (56) References JP-A-60-231790 (JP, A) JP-A-62-232484 (JP, A)

Claims (1)

(57) [Claims] 1. A coke oven group in which a plurality of coke ovens are connected and installed, wherein each coke oven group has at least one coke dry fire extinguishing facility. Based on the aging of prechamber stock, red hot coke is charged alternately to each coke dry fire extinguishing facility during kiln discharge of each furnace group to maintain a constant amount of coke cutout and steam recovery. How to operate coke dry fire extinguishing equipment.