JPH03157486A - Operation of dry quenching facility for coke - Google Patents

Abstract

PURPOSE:To stabilize the operation of the subject facility by alternately charging red-heat coke to each dry quenching facility for coke during the coke- discharging work of each coke oven block based on the data on the variations of heat-recovering capacity, heat-recovering efficiency and inventory in a prechamber with time. CONSTITUTION:A plurality of coke oven blocks are placed adjacent to each other to form a coke oven group having one or more dry quenching facilities per unit coke block. Red-heat coke is charged alternately to each dry quenching facility during the coke-discharging operation of each oven block based on the data on the variations of heat-recovering capacity, heat-recovering efficiency and inventory in a prechamber with time. The variation of the discharging amount of quenched coke can be suppressed and the recovery of steam can be improved and stabilized by this process.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a coke dry extinguishing system in which the amount of cooled coke cut out has a small fluctuation range and the amount of steam recovered can be increased and stabilized. Concerning how to operate dry fire extinguishing equipment.

Conventional technology] - Red-hot coke discharged from coke ovens was conventionally extinguished by spraying water, but red-hot coke possesses a large amount of heat that is released into the atmosphere, and is entrained in the water vapor generated when extinguishing by spraying water. This caused problems such as dust being scattered in the surrounding areas and causing pollution problems.

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

In addition to the above-mentioned advantages, coke dry extinguishing equipment can recover combustible gas components such as methane, hydrogen, and carbon oxides remaining in red-hot coke, as well as carbon monoxide and other combustible gas components generated by coke combustion. There are advantages available.

On the other hand, by implementing coke dry extinguishing,
It has the disadvantage that the yield of lump coke decreases due to coke pulverization and coke combustion.

Conventionally, coke dry extinguishing equipment has a processing capacity of 30 to 50 t/h per coke oven group, and the boiler has a processing capacity of 30 to 50 t/h per coke oven group.
Since government inspections are mandatory, multiple units were installed, including one spare unit.

However, recently, installing one reactor with a processing capacity of 200 to 200 t/h per reactor group is not only cheaper, but also easier to operate.
Many large coke dry fire extinguishing facilities have been constructed.

Figure 1 shows an example of coke dry extinguishing equipment.
Red-hot coke discharged from a coke oven (not shown) is
It is loaded onto a coke packet (1) placed on a packet truck, hoisted to the top of a cooling tower (3) by a hoist (2), and charged into a pre-chamber (4) from above.

The red-hot coke introduced into the blast chamber (4) is sequentially lowered into the cooling chamber (5) where a circulation cooling gas consisting of an inert gas such as nitrogen is blown into the cooling chamber (5) by a circulation fan (6) from the lower blast head (7). The circulating gas is cooled by contact with the coke and is cut out by the lower cut-out device (8), while the circulating gas which has reached a high temperature by contacting the red-hot coke is removed from dust in the flue (9) and then introduced into the boiler (10). After being cooled by heat exchange, dust is removed again by a cyclone (11) and blown into a cooling chamber (5) by a circulation fan (6). The recovered steam, which is heated by heat exchange in the boiler (10) and becomes high temperature and high pressure, is sent to a turbine generator (not shown) or the like for use.

This coke dry extinguishing equipment maintains the inventory level in the brie chamber (4) at a predetermined level.

The amount of coke cut out is set.

On the other hand, since the unloading operation of the coke oven is carried out discontinuously, one furnace worth of red-hot coke is charged into the yellowtail chamber (4) at intervals of 7 to 9 minutes during the unloading operation. However, no red hot coke is added during the kiln discharge interval (1 to 2 hours).

Therefore, the inventory level in the pre-chamber (4) is
The amount of coke cut out is managed so that it reaches the upper limit level when the coke oven's unloading work is completed, and the inventory level is gradually lowered during the unloading interval, that is, when no coke is added, and the next kiln unloading operation is started. It is managed so that the lower limit level is reached at this point, and the amount of recovered steam is made uniform and fluctuations in the amount of coke cut are suppressed.

However, if the capacity of the pre-chamber is increased to match the amount of coke cut out during one kiln discharge interval, the amount of coke cut out can be made uniform, but the construction cost becomes relatively high.

For this reason, the amount of coke that is removed during unloading from the kiln is usually increased, and the amount of coke removed is reduced during interruptions. The gas components are combusted by introducing air during breaks in order to equalize the amount of recovered steam, but it is unavoidable that the amount of steam recovered varies during and during the unloading process.

Further, if the coke oven is constantly drained from the oven at regular intervals, the amount of coke cut and the amount of recovered steam can be made uniform, but such a method is difficult to implement.

Problems to be Solved by the Invention The present invention provides a method for coke dry extinguishing equipment that eliminates the need to significantly change the amount of coke cut out during and between periods of unloading from a coke oven, and that can suppress fluctuations in the amount of recovered steam. The purpose is to provide a method for operating dry fire extinguishing equipment.

Means for Solving the Problems The present inventors have conducted intensive research on suppressing fluctuations in the amount of coke cut out and the amount of recovered steam in the coke dry extinguishing equipment, and as a result, have found a method for suppressing fluctuations in the amount of coke cut out and the amount of recovered steam in the conventional coke oven.

■It is rare for a furnace group to be installed independently, and multiple furnace groups are often installed in a connected manner.

Moreover, the unloading work of each furnace group is rarely carried out at the same time, and usually, while one furnace group is being unloaded, the other furnace group is often in the process of being taken out of the kiln. Therefore, in order to prevent the amount of coke cut out from fluctuating during the intermission, it was found that red-hot coke could be introduced from the furnace group during the unloading operation to the coke dry extinguishing equipment of the furnace group during the intermission, and this invention was achieved. did.

In other words, the present invention provides for coke cutting in which each coke oven in which a plurality of coke ovens are installed in series is provided with at least one coke dry extinguishing equipment, and the heat recovery capacity and heat recovery of each coke dry extinguishing equipment are improved. Based on efficiency and changes in pre-chamber inventory over time, red-hot coke is mutually fed into each coke dry extinguishing system during the unloading of each furnace group.

Based on the heat recovery capacity and heat recovery efficiency of each coke dry extinguishing equipment, the amount of coke stock in each brie chamber, and the kiln discharge schedule of each coke oven, we predict the change over time in the inventory amount of each coke chamber, and In order to keep the amount of coke cut from the coke oven from fluctuating, red hot coke is alternately fed into each coke dry extinguishing equipment while each coke oven group is being discharged from the kiln. After putting coke into one coke dry extinguishing equipment, red-hot coke for multiple kilns is put into the other coke dry extinguishing equipment, or one coke is put into one coke dry extinguishing equipment according to the amount of stock in the brie chamber of each coke dry extinguishing equipment. It is also possible to alternately add the amount for one kiln to the other and the amount for multiple kilns.

In the present invention, in the coke dry extinguishing equipment of a coke oven in which multiple oven groups are installed in series, when each coke oven is discharged from the oven, the pre-chamber stock amount and coke cutting amount of each coke dry extinguishing equipment are adjusted. Since red-hot coke is added to each other accordingly, there is no need to significantly change the amount of coke cut out from the coke dry extinguishing equipment, and fluctuations in the amount of recovered steam can be suppressed.

Moreover, since the amount of red-hot coke input into each brie chamber is set in accordance with the heat recovery capacity and heat recovery efficiency of each coke dry extinguishing equipment, the amount of recovered steam is also maximized.

Examples Example 1 92 coke ovens (A furnace group) and 8 coke ovens with furnace height 71 = 25 mm
In a coke oven group where multiple coke oven groups consisting of 7 gates (B oven group) are installed in series, the heat recovery capacity and heat recovery efficiency of each coke dry extinguishing equipment, the inventory amount of each prechamber, and the amount of coke cut out Furthermore, based on the kiln unloading schedule of each coke oven group, a predictive calculation is performed to ensure that the inventory level of each Brie chamber is within the upper and lower limits and that the amount of coke cut out does not change, and based on the results, the stock level of each coke oven is Red-hot coke was added alternately. In that case, changes in the alternating coke injection situation, amount of coke cut out, pre-chamber stock amount, and amount of recovered steam were measured. the result.

is shown in Figure 2.

As shown in Figure 2, in the dry extinguishing equipment of all coke ovens, the amount of coke cut out does not change, the amount of pre-chamber inventory remains at a predetermined level, and the amount of recovered steam does not change. Very little.

Example 2 In the same coke oven group as in Example 1, red hot coke is alternately charged into the pre-chamber of each coke dry extinguishing equipment for each kiln during unloading work, and the amount of coke cut out is kept constant. The amount of inventory and the amount of recovered steam were measured. The results are shown in FIG.

As shown in FIG. 3, the amount of recovered steam is almost constant, and the pre-chamber inventory level fluctuates even less than in Example 1. This shows that in Example 2, the same effect was obtained as if the kiln unloading work was performed at predetermined time intervals.

Comparative Example In the same coke oven group as in Example 1, an example of changes over time in the stock level of each brie chamber, the amount of coke cut out, and the amount of recovered steam in the case of the conventional method in which only the red hot coke of the relevant oven group is charged is shown in Fig. 4. show.

As shown in Figure 4, while the coke oven is being unloaded, that is, while red-hot coke is being added, the inventory level in the Brie chamber is gradually increasing, the amount of coke cut out is also large, and the amount of recovered steam is increasing. There are also many. However, even though the amount of coke cut out is reduced during the kiln unloading period when red hot coke is not input, the inventory level in the pre-chamber gradually decreases, and the amount of recovered steam also decreases accordingly. It was impossible to keep 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 oven groups are installed in series, one of the coke ovens is When one furnace group is being unloaded from the kiln and the other furnace group is taking a break, the red hot coke from one furnace group is mutually fed into each pre-chamber, so there is no red hot coke in each pre-chamber even during the kiln unloading period. Injected. In other words, it is possible to operate the coke dry extinguishing equipment with optimal efficiency according to its heat recovery capacity and heat recovery efficiency, and as a result, the total amount of recovered steam can be maximized. In addition, in each coke dry extinguishing system, if red-hot coke is alternately introduced into each kiln, red-hot coke can be continuously introduced at predetermined time intervals, which is ideal for coke dry extinguishing equipment, and the amount of coke cut and the amount of recovered steam are is stable and high efficiency operation can be achieved.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing an example of coke dry extinguishing equipment;
Figure 2 shows the Brichamber inventory level in Example 1;
Figure 3 is an explanatory diagram of changes over time in the amount of coke cut out and the amount of recovered steam.
The figure is an explanatory diagram of temporal changes in the stock level of the brie chamber, the amount of coke cut out, and the amount of recovered steam in a comparative example. 1... Coke packet, 2... Winding machine, 3
...Cooling tower, 4...Pre-chamber 5...Cooling chamber, 6...Circulation fan,
7... Blast head, 8... Cutting device, 9
... Flue, 10... Boiler 11.
··Cyclone,

Claims (1)

[Claims] 1. In a coke oven group where multiple oven banks are installed in series and each coke oven group has at least one coke dry extinguishing equipment, the heat recovery capacity, heat recovery efficiency, and prechamber inventory of each coke dry extinguishing equipment 1. A method of operating coke dry extinguishing equipment, characterized in that red-hot coke is mutually introduced into each coke dry extinguishing equipment during the unloading operation of each furnace group based on the temporal fluctuation of the temperature.