JP5131918B2 - Heating method for coke dry fire extinguishing equipment - Google Patents

Description

  The present invention relates to a method for raising the temperature of a coke dry fire extinguisher (Coke Dry Quencher, hereinafter also referred to as “CDQ”), and more particularly to a method for raising the temperature of CDQ using the heat held by red hot coke.

  Coke produced by carbonizing coal in a coke oven is in a red hot state at a temperature of about 1000 ° C. Hereinafter, the coke in such a state is referred to as red hot coke. The red hot coke is cooled for use, and the method of cooling the red hot coke is roughly classified into wet type and dry type.

  Among these, the coke wet fire extinguishing method is a method in which red hot coke is mounted on a wet fire extinguisher and transferred to a sprinkling fire extinguishing equipment called a fire extinguishing tower, and the water sprinkling fire extinguishing equipment is cooled with water to extinguish and cool. On the other hand, the coke dry fire extinguishing method is a method in which red hot coke is mounted on a dry fire extinguisher and transferred to the CDQ, and the red hot coke is extinguished and cooled with an inert gas in the CDQ.

Hereinafter, an outline of the cooling method of red hot coke in CDQ and CDQ will be described.
As shown in FIG. 1, the red hot coke 4 discharged from the carbonization chamber 2 a of the coke oven 2 to the dry fire extinguisher bucket 3 by the extruder 1 is a coke dry fire extinguisher that constitutes a CDQ 5 as shown in FIG. 2. It is transferred to the upper part of 51 and put into the coke dry fire extinguishing apparatus 51.

  As shown in FIG. 3, for example, the dry fire extinguisher bucket 3 includes a gate 3 b that is opened and closed by pushing and pulling a link 3 a on the bottom surface of the bucket. And the injection | throwing-in of the red hot coke 4 to the coke dry fire extinguishing apparatus 51 is performed by opening the said gate 3b, after opening the cover of the inlet of the coke dry fire extinguishing apparatus 51. FIG.

  Thereafter, in the process of moving the inside of the coke dry fire extinguishing apparatus 51 from the upper part to the lower part by an inert gas (hereinafter also referred to as “circulation gas”) introduced from the lower part of the coke dry fire extinguishing apparatus 51, the red hot state is reached. Fire extinguished, cooled to about ~ 200 ° C, cut out from the bottom.

  On the other hand, the circulating gas heated by the heat of the red hot coke 4 when rising inside the coke dry fire extinguisher 51 is recovered by the heat recovery boiler 54 through the flue 53 and cooled, It is again introduced into the coke dry fire extinguisher 51 by the circulation fan 52. A dust removal grid 55 is installed in the flue 53 between the coke dry fire extinguishing device 51 and the heat recovery boiler 54 so as to remove coke powder and the like accompanying the circulating gas.

By the way, the coke dry fire extinguishing device 51 is roughly divided into a storage zone 51a, a suction zone 51b, and a cooling zone 51c from the top.
Among these, the storage zone 51a is a zone which stores the red hot coke 4 thrown from the dry fire extinguisher bucket 3, and is a buffer zone for allowing the CDQ 5 to operate continuously against the red hot coke 4 thrown intermittently. Plays the role of

  The cooling zone 51c is a zone in which the red hot coke 4 and the circulating gas exchange heat in a countercurrent, and has a cooling circulating gas introduction portion 51ca and a cooled discharge portion 51cb of the coke 4 at the lower portion. Further, the suction zone 51 b is a zone where the circulating gas that has risen up the cooling zone 51 c and cooled the red hot coke 4 is sucked and escapes to the flue 53.

  The storage zone, suction zone, cooling zone, flue, and dust removal grid of these coke dry fire extinguishing devices are fireproof so that they can withstand the heat of hot circulating gas passing through the inside of red coke and CDQ during normal operation of CDQ. It is built with things.

  These refractories are subject to wear due to contact with red hot coke and temperature fluctuations due to various reasons, and damages such as cracks and defects of the refractory occur. Therefore, inspection and repair of the refractory (hereinafter simply referred to as “repair”). ") Is also required."

  Speaking of temperature fluctuations at the time of temperature rise, this refractory has a property that its volume expands by about 1% when it rises from room temperature to around 800 ° C. which is the normal operating temperature range of CDQ. The expansion rate is proportional to the temperature increase rate in the CDQ, but when the temperature increase rate is high, it cannot withstand rapid expansion and has the property of causing cracks and defects. Moreover, there is a possibility of falling off from the wall surface due to a competition between adjacent refractories.

  Therefore, although the CDQ is heated up to the normal operating temperature range over several days, cracks and defects due to expansion may still occur.

  When a refractory is cracked or chipped, the repair is carried out at room temperature. However, the temperature rise from the room temperature to the normal operating temperature after the repair may cause cracking or chipping again.

Patent Document 1 discloses a suction band column repairing method and an upper structure of a suction band opening so that a suction band having a complicated structure can be easily repaired.
JP 7-33245 A

  As described above, the CDQ needs to be raised from the normal temperature to the normal operating temperature range at the time of construction start-up, as well as at the time of periodic inspection and after repair.

  As the CDQ temperature raising method, hot air drying, burner drying, or the like is mainly employed for construction start-up. On the other hand, in addition to the above-described method, there is a method of increasing the temperature by using reddish coke and using the heat held by the reddish coke in addition to the above-described method.

  In the CDQ heating method using red heat coke heat, the circulating gas becomes hot air due to the heat of the coke that has been added, and the entire inside of the CDQ is heated by circulating through the CDQ with a circulation fan. The temperature is controlled by the temperature of the circulating gas.

  Therefore, when the CDQ is heated by introducing red hot coke, it is necessary to take into account the expansion of the refractory inside the CDQ and the temperature increase due to the red hot coke that is charged at a time. .

  In this CDQ temperature raising method by charging red hot coke, the amount of coke charged into the CDQ at one time is the amount discharged from the coke oven carbonization chamber by the extruder into the dry fire truck bucket, ie, 1 The amount was about one carbonization chamber (around 20 tons).

  However, when red coke for one carbonization chamber is charged at a time, the amount of heat is large, and the refractory in the CDQ expands rapidly, causing cracks and cracks, or between adjacent refractories. Competed and dropped out.

  Further, when the refractory in the CDQ is reloaded, the newly reloaded refractory contains moisture. Therefore, in order to prevent damage due to rapid moisture evaporation of the refractory during the temperature increase, it is desirable to provide a dehydration time while maintaining a constant temperature for several hours during the temperature increase process. However, if the entire amount of coke for one carbonization chamber is charged, the amount of heat is large and it is difficult to adjust the temperature.

  The problem to be solved by the present invention is that in the CDQ temperature rising method in which red coke for one carbonizing chamber is charged at a time, the amount of heat is large, and the refractory expands rapidly, causing defects and cracks. It is the point that it was generated, or the adjacent refractories competed and invited to drop.

  In addition, when the refractory in the CDQ is transshipped, it is desirable to provide a dehydration time during the temperature raising process in order to prevent damage due to rapid moisture evaporation of the refractory when the temperature is raised. The temperature adjustment was difficult.

The method of raising the temperature of the coke dry fire extinguishing equipment of the present invention is as follows:
In order to adjust the temperature increase range by one-time red hot coke injection and to increase the temperature as set,
In the method of putting red hot coke into the coke dry fire extinguisher and raising the temperature inside the coke dry fire extinguishing equipment with the heat,
The most important feature is that the red hot coke in one coking chamber of the coke oven is divided and put into a coke dry fire extinguisher.

  In the present invention, the red hot coke for the one carbonization chamber may be divided by any method. For example, if the extrusion distance of the rack beam of the extruder is adjusted, the amount of extrusion can be easily adjusted. be able to.

  In addition, when charging red hot coke into a CDQ from a dry fire extinguisher bucket in which the entire amount of red coke in one carbonization chamber has been extruded, the gate is closed before the entire amount of red hot coke in the bucket is charged, By repeating the operation of stopping, it is possible to divide into several times without throwing the whole amount at once.

  In the present invention, if the temperature rise pattern is set according to the refractory repair status of the coke dry fire extinguishing equipment, and the amount and pitch of the red hot coke are adjusted so as to match this setting, the temperature rise will be as set. It becomes possible to raise the temperature in a temperature pattern.

  At that time, when the refractory is reloaded during repair of the refractory in the coke dry fire extinguishing equipment, the amount of the red hot coke is charged and charged so that a certain temperature holding time is provided in the temperature rising pattern. It is desirable to adjust the pitch.

  In the present invention, since the rapid temperature rise in the CDQ is suppressed and constant holding at an arbitrary temperature is possible, rapid expansion of the refractory and damage due to moisture evaporation in a short time are suppressed. Therefore, the life of the refractory in the CDQ is extended, the repair cost can be reduced, and the deterioration of the heat recovery efficiency due to the damage of the refractory in the CDQ is suppressed.

  Further, the damage to the refractory in the CDQ is increased, and the possibility of the refractory in the CDQ falling is increased, and it is possible to suppress the operator from being exposed to danger during inspection and repair in the CDQ.

The best mode for carrying out the present invention will be described below with reference to FIGS.
Examples of temperature rising patterns corresponding to the refractory repair status of the coke dry fire extinguishing equipment are shown in FIG. 4 and FIG.

  FIG. 4 is an example of a temperature rise pattern when the refractory repair in the CDQ is carried out by reloading at least one refractory in the suction zone, the storage zone, the cooling zone, the flue, and the dust removal grid.

  Since the newly reloaded refractory contains moisture, in the example of FIG. 4, the dehydration of the refractory during the heating time of about 60 hours to the normal operating temperature of CDQ (about 800 ° C.). In addition, a temperature holding time of about 200 ° C. is provided for about 10 hours.

FIG. 5 is an example of a temperature rise pattern when the refractory repair in the CDQ is not performed.
The temperature raising time to the normal operating temperature of the CDQ is set to about 20 hours, and the temperature is raised without providing a constant temperature holding time.

  To raise the temperature inside the CDQ, red hot coke loaded in a dry fire extinguisher bucket is put into the coke dry fire extinguisher and a circulation fan is started, and the heat from the red hot coke is used as hot air to circulate between the CDQ and the heat recovery boiler. To do.

  Therefore, in order to achieve the temperature increase pattern shown in FIG. 4 or FIG. 5, the temperature increase in the CDQ is adjusted by the amount of reddish coke to be input and its input pitch. At this time, the temperature in the CDQ is, for example, the temperature measured at the inlet of the heat recovery boiler.

  The amount of reddish coke to be charged at one time may be adjusted, for example, by adjusting the extrusion distance of the rack beam 1a of the extruder 1 that extrudes the reddish coke 4 from the carbonization chamber 2a of the coke oven 2 (see FIG. 1).

  That is, the pushing distance of the rack beam is proportional to the amount of coke to be charged, and the longer the pushing distance, the larger the coke amount, and the shorter, the smaller the coke amount. Therefore, if half the red hot coke of one carbonization chamber is required, the rack beam may be pushed at a distance half that of normal extrusion.

  Therefore, when the rack beam is pushed out by a distance corresponding to the amount to be fed into the coke dry fire extinguisher, the rack beam is stopped, and the extrusion process is temporarily interrupted and received in the dry fire extinguisher bucket, thereby being fed into the coke dry fire extinguisher at a time. The amount of red hot coke can be adjusted arbitrarily.

  In the practice of the present invention, when red hot coke is extruded from the carbonization chamber, for example, the red hot coke remaining in the carbonization chamber is received by another fire extinguisher bucket and put into another coke dry fire extinguisher, or by wet fire extinguishing. Process.

  In addition, when adjusting the amount of red hot coke to be supplied to the coke dry fire extinguisher at one time with the fire extinguisher bucket, it is divided and put in by repeating the gate opening and closing, but the red hot coke remaining in the fire extinguisher bucket for some reason is The red coke left in the carbonization chamber can be treated in the same manner.

  In the present invention, since the amount of reddish coke charged at one time is reduced, the temperature rise in the CDQ at that time can be suppressed, and the temperature rise of the CDQ can be adjusted more finely. As shown in FIG. 5, the temperature increase management can be performed with an arbitrary temperature increase pattern.

An example in which the CDQ is heated by the method of the present invention will be described below.
Temperature rise with a constant temperature holding area that keeps the temperature holding time of 200 ° C as shown in Fig. 4 for 10 hours for CDQ that carries out re-loading of internal refractories in periodic repairs and raises the temperature for re-operation. Set the pattern.

  The temperature inside the CDQ was the temperature measured at the inlet of the heat recovery boiler. At the beginning of the CDQ temperature rise, the first time, the amount of red hot coke that is ½ of one coking chamber is discharged to the dry fire extinguisher bucket. At 2 the rack beam stopped moving.

  The dry fire extinguisher bucket that received half of the red coke of one carbonization chamber moved to the upper part of the coke dry fire extinguisher, and the coke was put into the coke dry fire extinguisher. The heat from the red hot coke was turned into hot air by the circulation fan, circulated in the coke dry fire extinguisher and the heat recovery boiler, and the internal temperature started to rise.

  These inputs were repeated so as to match the temperature rising pattern while confirming the temperature of CDQ. On the other hand, the red hot coke remaining in the carbonization chamber was discharged to another wet fire extinguisher and treated by wet fire extinguishing.

  In FIG. 6, together with the temperature increase pattern shown in FIG. 4, the temperature increase results obtained in the present example (◯ mark) and the temperature increase results when all of the conventional red coke in one carbonization chamber was charged ( Both are marked.

  In the conventional total amount charging, since the temperature increase due to one red hot coke charging is large, as shown in FIG. 6, a large temperature increase (point p1) occurred at the initial stage of the temperature raising step. Even if there was an interval until the next red hot coke was charged, a large temperature increase (p2 point) occurred again due to the next red hot coke being charged. Further, even in a constant temperature holding region where dehydration of the refractory was performed, a temperature increase (p3 point) that was about 100 ° C. higher than the target 200 ° C. occurred.

  On the other hand, in the temperature raising method of the present invention, the temperature rise in the CDQ that rises at a time can be kept low (points P1 and P2), and the temperature control is closer to the set temperature even in the constant temperature holding range. Was achieved.

  As shown in FIG. 5, even in the case of a temperature rising pattern without providing a constant temperature holding region as shown in FIG. 5, as shown in FIG. ), A significant temperature increase (p4) occurred in the early stage of temperature increase.

  On the other hand, in the temperature raising method (circle) of the present invention, the temperature rise width in the CDQ that rises at a time can be kept low (point P3), and the temperature control is closer to the temperature rising pattern shown in FIG. It became possible to achieve.

  As described above, according to the present invention, it is possible to adjust the amount of red hot coke to be supplied to the coke dry fire extinguisher according to the state of repair of the refractory in the CDQ, and to enable a temperature increasing method that arbitrarily changes the temperature increasing pattern. It was.

  The present invention is not limited to the above example, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  For example, the temperature raising time and the set temperature are not limited to the examples shown in FIGS. 4 and 5, and the temperature may be set for an arbitrary time according to the state of the refractory and the entire CDQ.

  The present invention as described above can be applied to other than the coke dry fire extinguishing equipment, as long as a high-temperature one is used to raise the temperature of the lining refractory.

It is the figure which showed the extrusion process of the coke in a carbonization chamber in a section. It is the figure which showed schematic structure of the CDQ main body and the heat recovery boiler. It is the figure which showed the structure of the gate which can be opened and closed provided in the bottom face of the dry fire extinguisher bucket. It is the figure which showed an example of the temperature rising pattern at the time of reloading the refractory in CDQ. It is the figure which showed the example of the temperature rising pattern at the time of not performing refractory repair in CDQ. It is the figure which showed the performance temperature graph at the time of implementing a prior art and this invention with respect to the temperature rising pattern of FIG. It is the figure which showed the performance temperature graph at the time of implementing a prior art and this invention with respect to the temperature rising pattern of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Extruder 1a Rack beam 2 Coke oven 2a Carbonization chamber 3 Dry fire extinguisher bucket 3b Gate 4 Red hot coke 5 CDQ
51 Coke dry fire extinguisher 52 Circulating fan 53 Flue 54 Heat recovery boiler 55 Dust removal grid

Claims (4)

In the method of putting red hot coke into the coke dry fire extinguisher and raising the temperature inside the coke dry fire extinguishing equipment with the heat,
A method for raising the temperature of a coke dry fire extinguishing facility, characterized in that red coke in one carbonization chamber of a coke oven is divided and fed into a coke dry fire extinguisher.   The method for raising the temperature of a coke dry fire extinguishing system according to claim 1, wherein the red hot coke in the one carbonization chamber is divided by adjusting an extrusion distance of a rack beam of an extruder. Set the heating pattern according to the refractory repair status of the coke dry fire extinguishing equipment,
The method for raising the temperature of a coke dry fire extinguishing system according to claim 1 or 2, wherein the amount and pitch of the red hot coke are adjusted so as to satisfy the setting.   When reloading refractories during repair of refractories in the coke dry fire extinguishing equipment, the amount and pitch of the red hot coke are set so that a certain temperature holding time is provided in the temperature rising pattern. It adjusts, The temperature rising method of the coke dry-type fire extinguishing equipment of Claim 3 characterized by the above-mentioned.

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