JP2011079992A - Method of charging coke for coke dry quenching equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of charging coke for coke dry quenching equipment (CDQ), which adequately satisfies the distribution function of a distributive charging bell and adequately prevents thermal damage of CDQ and provides heat exchange capability as CDQ even for a large bucket from a furnace having a large crucible capacity, without increase in the size of a charging device or increase in the cost due to expensive countermeasures for heat resistance. <P>SOLUTION: In the method of charging coke for CDQ by charging red hot coke from a coke bucket 6 into a chamber 1 via a charging device having a chute hopper 3 and a distributive charging bell 5 provided therebelow by opening an opening/closing gate 10 provided at the bottom of the coke bucket 6, the red-hot coke is charged into the chute hopper 3 while pausing, in midway, the opening of the opening/closing gate 10, and after lapse of a predetermined time, the remaining red-hot coke is wholly charged at an opening degree of the opening/closing gate 10 larger than that when the opening is paused in midway. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a coke charging method for a coke dry fire extinguishing facility that cools red hot coke produced in a coke oven.

In the coke dry fire extinguishing equipment (CDQ), red hot coke having a temperature of 1000 ° C. or more extruded from a coke oven is charged into the chamber and cooled by being exchanged with an inert gas. The red hot coke extruded from the coke oven is received by a coke bucket having an open / close gate at the bottom, and the coke bucket is conveyed to the upper part of the chamber by a crane. After that, the open / close gate of the coke bucket is opened, and the red hot coke is charged into the chute hopper provided in the upper part of the chamber by its own weight and charged into the chamber.

Further, a coke distribution charging bell is provided at the lower portion of the chute hopper, and the distribution of the coke particle size charged in the chamber is uniformly improved through the chute hopper and the bell.

Conventionally, when the red hot coke is thrown into the CDQ, the amount of dropping from the coke bucket and the amount falling into the chamber from the hopper are equalized in the middle of opening the opening / closing gate of the coke bucket toward full open. There is known a method of charging the battery (see Patent Document 1).

JP-A-61-55188

  However, the method of the above-mentioned Patent Document 1 considers only the general method concept of keeping the balance between the amount of coke supplied from the bucket located at the upper part of the hopper and the amount of charge to the chamber located at the lower part. In the advanced charging technology, it was not possible to sufficiently satisfy the important performance and functions of the entire equipment such as the uniform distribution function expected for the charging apparatus and the accompanying improvement in cooling performance in the chamber. Further, there was no means for specifically balancing the amount, and the function as an actual mechanism could not be satisfied.

  On the other hand, it is important to secure sufficient repulsive force by the coke bell when charging coke in a charging device having a coke uniform distribution function in recent years, specifically, a charging device with a bell for distributing charging. It has become a technical element.

Therefore, in this technology, the optimum repulsive force and coke distribution function are satisfied in relation to the shape of the opening / closing gate of the bucket and the shape of the chute hopper and the distribution charging bell shape, and the cooling capacity in the chamber is improved. is there.

Particularly in recent years, for the purpose of improving the environment, coke ovens tend to be constructed with large furnaces in order to minimize the number of times the lid is opened and closed, and the buckets that carry coke are also becoming larger. As a result, there is a need to increase the size of the charging device, which is a cause of cost increase. When the conventional charging method is adopted, the intermediate opening of the chute hopper is too small to obtain sufficient repulsion due to the distribution charging bell, and too much coke is accumulated in the chute hopper. The shoot hopper may become red hot and cause damage such as thermal strain.

Therefore, the present invention sufficiently satisfies the distribution function by the distribution charging bell, and costs such as an increase in the charging device and an expensive heat-resistant measure even for a large bucket coming from a furnace having a large capacity of one pot. It is intended to provide a CDQ coke charging method capable of fully exhibiting CDQ thermal damage prevention and heat exchange capability as a CDQ without any increase.

The present invention relates to a CDQ coke apparatus in which an open / close gate provided at the bottom of a coke bucket is opened and red hot coke is charged into a chamber via a chute hopper and a charging apparatus provided with a distribution charging bell below the chute hopper. In the charging method, the opening of the open / close gate at the bottom of the coke bucket is stopped in the middle and the red hot coke is put into the chute hopper. After a certain period of time, the remaining red hot coke is fully discharged at an opening larger than the opening of the intermediate stop. It is characterized by charging.

The opening degree of the intermediate stop opening / closing gate is such that the ratio of the opening area (S1) of the opening / closing gate and the opening area (S2) of the intermediate throttle portion of the chute hopper is 0.65 ≦ S2 / S1 ≦ 1.3. To do.

  The predetermined time (t) is W ≧ Qr−S2 × V2 × t (where S2: area of the middle throttle opening at the middle throttle opening of the chute hopper, V2: coke dropping speed (V2), Q: initial in bucket The time (t) when the amount of coke, W: chute hopper capacity) is obtained.

Alternatively, at the time of charging at the intermediate stop, the weight of the coke in the bucket is measured and charged until the residual coke amount in the bucket (Qr) becomes equal to or less than the chute hopper capacity (W). The coke is charged by increasing the opening of the open / close gate at the bottom of the bucket.

The gate angle (θ) is θ ≧ 35 degrees when the opening is larger than the intermediate stop opening.

In the present invention, when red hot coke is introduced from a coke bucket through a chute hopper, a repulsive force from an appropriate distribution charging bell can be obtained and a sufficient distribution function can be exhibited. Since the particle size distribution of the coke deposit on the surface is improved, the cooling efficiency can be increased.

In addition, it is possible to improve the heat exchange capacity and increase the cooling efficiency without increasing the size of the charging device in the large and large capacity bucket. Further, since it is not necessary to make the heat resistance specifications higher than necessary, the cost can be reduced.

It is the schematic which shows the coke bucket and coke charging apparatus which apply the charging method of this invention. It is a schematic sectional drawing of the distribution charging bell. (A) is a cross-sectional area (S1) of an open / close gate, (b) is a figure which shows the cross-sectional area (S2) of the intermediate | middle throttle part of a chute hopper. It is a figure which shows the capacity | capacitance (W) of a chute hopper. The change of the opening degree of the opening-and-closing gate in the charging method of this invention is shown, (a) is a figure of the opening degree of an intermediate stop state, (b) is a figure of the opening degree after an intermediate stop.

  Embodiments of the present invention will be described with reference to the drawings.

  In FIG. 1, a chute hopper 3 is disposed above a coke charging inlet 2 of a CDQ chamber 1. A distribution charging bell 5 for evenly distributing the red hot coke falling into the chamber 1 is disposed below the chute hopper 3. The chute hopper 3 is formed with an intermediate throttle portion 4 in order to reliably and accurately drop the red hot coke thrown into the distribution charging bell.

As shown in FIG. 2, the distribution charging bell 5 has an inclination angle (Φ0) in a range of 40 degrees ≦ Φ ≦ 60 degrees, and is intermediate between the diameter (D0) of the distribution charging bell 5 and the chute hopper 3. The ratio of the minimum length (L2) (regardless of round shape or square shape) of the aperture of the aperture portion 4 is set such that 0.6 ≦ D0 / L2 ≦ 0.75. Furthermore, it is desirable that the ratio of the diameter (D0) of the distribution charging bell 5 and the chamber diameter (D3) is 2.2 ≦ D3 / D0 ≦ 2.6.

The coke bucket 6 receives the red hot coke pushed out from the coke oven, is then transported to the upper side of the chamber 1 by the crane 7, and throws the red hot coke into the chute hopper 3. The coke bucket 6 is supported by the trunnion block 8. The hook 9 of the crane 7 is hung on the trunnion block 8 to convey the coke bucket 6 onto the chute hopper 3, and is disposed separately on the upper portion of the chute hopper 3. Place on a bucket cradle (not shown). One end of a pair of opening / closing arms 11 for opening / closing the opening / closing gate 10 downward is rotatably connected to the trunnion block 8, and the other end is rotatably connected to the opening / closing gate 10. The open / close gate 10 is opened and closed by the vertical movement of the open / close arm 11.

  Even if the coke bucket 6 is placed on the bucket cradle with the trunnion block 8 suspended by the crane 7, the trunnion block 8 is suspended and the open / close arm 11 does not move downward, so the open / close gate 10 opens. Absent. When the crane 7 is further lowered, the trunnion block 8 is lowered, and the open / close arm 11 moves downward to open the open / close gate 10. When the trunnion block 8 is lifted from the state in which the open / close gate 10 is open, the open / close arm 11 moves upward to close the open / close gate 10.

  As shown in FIG. 5 (a), when the present invention opens the open / close gate 10 of the coke bucket 6 and puts the red hot coke C into the chamber through the chute hopper 3, as shown in FIG. From the start of charging of the red hot coke C, the opening of the open / close gate 10 is stopped at a constant opening to drop the red hot coke, and after a predetermined time has elapsed, as shown in FIG. The remaining amount of red hot coke C is charged at.

The opening degree of the open / close gate 10 when the red hot coke is introduced after the intermediate stop is shown in FIG. 3 as a ratio between the open area (S1) of the open / close gate and the open area (S2) of the intermediate throttle portion 4 of the chute hopper 3. Is set to satisfy 0.65 ≦ S2 / S1 ≦ 1.3. When the ratio of S2 / S1 is outside the above range, the following problem occurs.

(1) In the case of S2 / S1 <0.65, it means that the intermediate throttle is too small, red hot coke is accumulated too much in the chute hopper, and the speed at which the chute slides down and sufficient space for coke rebound are limited. The As a result, it becomes impossible to obtain an appropriate repulsive force at the bell, and the particle size distribution in the chamber deteriorates. This is particularly noticeable when the capacity of a single coke oven described in the section of “Prior Art” is large, and the capacity of the coke dry fire extinguishing equipment cannot be fully exhibited.

(2) In the case of S2 / S1> 1.3, it means that the intermediate throttle part is too large, and the coke that has slipped down in the chute hopper does not properly hit the distribution charging bell. It falls directly into the chamber without hitting the bell, and the particle size distribution in the chamber deteriorates as in the case (1).

An appropriate aperture ratio that avoids the above problem is 0.65 ≦ S2 / S1 ≦ 1.3.

In addition, if sticking to the above S2 / S1 ratio, in some cases, coke remains in the open / close gate at the bottom of the bucket, and there is a possibility that it will bite when closing the gate, causing trouble. In order to avoid this, it is necessary to widen the open / close gate 10 to 35 degrees or more and reliably drop the coke.

In combination with the above, when charging red hot coke in two stages, charging by an intermediate stop of the opening / closing gate 10 and charging at a final opening after a certain time has elapsed, the certain time (t ) Is W ≧ Q−S2 × V2 × t (where S2: area of the middle throttle opening at the middle throttle opening of the chute hopper, V2: coke dropping speed (V2), Q: initial amount of coke in the bucket, W: It is assumed that the time (t) is the shoot hopper capacity.

Further, at the time of charging at the intermediate stop, the weight of the coke in the bucket was measured and charged until the amount of coke remaining in the coke bucket (Qr) became equal to or less than the chute hopper capacity (W), so that Qr <W. From the time, the opening of the open / close gate at the bottom of the bucket is increased and coke is charged.

1: Chamber 2: Coke charging inlet 3: Chute hopper 4: Intermediate throttle 5: Distribution charging bell 6: Coke bucket 7: Crane 8: Trunnion block 9: Hook 10: Open / close gate 11: Open / close arm

Claims (5)

In the coke charging method for CDQ, the open / close gate provided at the bottom of the coke bucket is opened and the red hot coke is charged into the chamber via the chute hopper and the charging device provided with the distribution charging bell at the lower part.
Stop the opening of the open / close gate at the bottom of the coke bucket, put the red hot coke into the chute hopper, and after a certain period of time, add the remaining red hot coke at an opening larger than the opening of the intermediate stop. The coke charging method of the characteristic coke dry fire extinguishing equipment. The opening degree of the intermediate stop opening / closing gate is such that the ratio of the opening area (S1) of the opening / closing gate and the opening area (S2) of the intermediate throttle portion of the chute hopper is 0.65 ≦ S2 / S1 ≦ 1.3. The coke charging method for the coke dry fire extinguishing equipment according to claim 1. The predetermined time (t) is W ≧ Q−S2 × V2 × t (where S2: the area of the middle throttle opening at the middle throttle opening of the chute hopper, V2: coke dropping speed (V2), Q: initial in bucket The coke charging method for the coke dry-type fire extinguishing equipment according to claim 1 or 2, characterized in that the time (t) when the amount of coke is W: chute hopper capacity). At the time of charging at the intermediate stop, the weight of coke in the bucket is measured and charged until the amount of remaining coke in the bucket (Qr) becomes less than the chute hopper capacity (W). The coke charging method for a coke dry fire extinguishing system according to claim 1 or 2, wherein the coke is charged by increasing the opening of the open / close gate at the bottom. 5. A coke charging method for a coke dry-type fire extinguishing system according to claim 1, wherein the opening further larger than the intermediate stop has a gate angle (θ) of θ ≧ 35 degrees. .

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