JP2013221076A - Multi-cyclone dust collector usable for cdq installation and method for operating cdq installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-cyclone dust collector usable for a CDQ installation, and preventing the wear of both-sucking type fan, and to provide a method for operating the CDQ installation.SOLUTION: A multi-cyclone dust collector 15 is divided into (1+2n) divisions each having a plurality of unit cyclones so as to be even in the right and the left, and opening and closing dumpers for carrying out the on/off-operation of a passing circulating gas are installed in each thereof in a CDQ installation 10 for sending the circulating gas having passed a boiler 13 after having passed a cooling chamber 11 to the cooling chamber 11 through a multi-cyclone dust collector 15 and a both-sucking type fan 20, and alternately carrying out a normal-load operation and a low-load operation in which the amount of the circulating gas is reduced compared to the set normal-load operation. A controller for carrying out the opening and closing of the opening and closing dumper according the amount of the air while unifying the amount of the air at the right and left sucking ports 18 and 19 of the both-sucking type fan 20 when carrying out the low-load operation is installed to hold the concentration of dust at a prescribed value or lower.

Description

The present invention collects the sensible heat of the circulating gas (main component is nitrogen gas) generated from the cooling chamber of red hot coke by a boiler, and collects dust in the circulating gas that has passed through the boiler by a multi-cyclone dust collector, The present invention relates to a CDQ facility (coke dry fire extinguishing facility) that is again sent to a cooling chamber by both suction fans, and more particularly to a multi-cyclone dust collector used in this facility and a method of operating this facility.

For example, Patent Document 1 is used by attaching to a coke oven, putting red hot coke into a cooling chamber, cooling red hot coke through a circulating gas (inert gas), and hot circulating gas generated from the cooling chamber. A CDQ facility is disclosed in which sensible heat is recovered by a boiler, removed by a secondary dust collector (usually a cyclone), and then circulated through a cooling chamber by a fan. And in order to respond | correspond to the quantity of the red hot coke discharged | emitted from a coke oven, the air volume of the circulating gas to circulate is fluctuate | varied, and it can always ensure the maximum steam quantity with a boiler. In this CDQ facility, a multi-cyclone dust collector used for the CDQ facility for removing dust contained in the circulating gas discharged from the red hot coke is used on the outlet side of the boiler.

Patent Document 2 proposes a multi-cyclone dust collector that removes soot contained in exhaust gas from a diesel engine. In this multi-cyclone dust collector, a partition is provided in the dust collection chamber to divide into a plurality of compartments, and an opening / closing damper for controlling the inflow of exhaust gas is provided at the entrance of each of the compartments so that the entire exhaust gas flow rate When there is little, the exhaust gas flow rate which flows into the predetermined division | segmentation divided | segmented is closed using an opening-and-closing damper, and the exhaust gas flow rate which flows into the remaining divisions is enlarged. As a result, since the dust collection performance of each unit cyclone provided in the remaining sections does not deteriorate, the performance of the multi-cyclone dust collector can be maintained.

Japanese Patent Laid-Open No. 10-298554 JP-A-8-80455

Although the CDQ facility described in Patent Document 1 is operated by changing the flow rate of circulating gas, the maximum dust collection capacity is exhibited by operating with the rated flow rate of circulating gas. Multi-cyclone dust collectors used for CDQ facilities are used, but when the flow rate of circulating gas is reduced, the air volume (ie, wind speed) passing through the multi-cyclone is lowered, and in such a multi-cyclone using centrifugal force, Did not give any consideration to the decline in dust collection capacity. That is, in the CDQ equipment, after putting the red hot coke into the cooling chamber, it performs a steady load operation (usually at the maximum capacity of the equipment) for a predetermined time (for example, 3 hours), and then supplies the red hot coke from the coke oven. When the processing amount of red hot coke is reduced, such as when the engine is temporarily stopped, a low load operation for reducing the air volume to, for example, about 40% of the maximum load is performed for 1 hour, for example.

Here, if the multi-cyclone dust collector used in the CDQ facility is operated in a state where the amount of the circulating gas is reduced during the low load operation, the dust collecting ability for the circulating gas passing through the multi-cyclone dust collector used in the CDQ facility is reduced. The amount of dust contained in the circulating gas and the average particle size were increased. Therefore, the blades of the double suction fans in the circulation path of the circulating gas have a problem that the wear of the double suction fans is accelerated by the dust having a large particle size and the life of the double suction fans is shortened.

The reason will be described in detail. The relationship between the dust collection efficiency of one cyclone (hereinafter referred to as “unit cyclone”) and the air volume (that is, the wind speed) is shown in FIG. The dust collection efficiency decreases when the value falls. FIG. 8B shows the relationship between the air volume of the unit cyclone and the average particle diameter ratio. When the air volume decreases, the average particle diameter ratio of the dust increases.

On the other hand, the amount of wear of the fan blades arranged downstream of the multi-cyclone dust collector is determined by the kinetic energy of the dust particles, and the kinetic energy is proportional to the square of the mass and the wind speed. Since it is proportional to the cube of the power, it eventually depends greatly on the amount of dust and the particle size of the dust, and this is shown in FIG.

Moreover, although the multicyclone dust collector of patent document 2 restrict | limits the dust collection chamber to be used even if exhaust gas flow volume changes, the technique which maintains the wind speed and has acquired high dust collection efficiency is disclosed. Since the diesel engine dust is collected, the quality of the exhaust gas is different from the circulating gas used in the CDQ equipment having dust having a relatively wide particle size distribution (that is, mainly coke powder). Further, in order to save space in the CDQ equipment, a double suction fan that can be downsized and outputs a large amount of circulating gas is used. Patent Document 2 discloses such a double suction fan and No consideration has been given to the wear of the blades of these double suction fans.

The present invention prevents the wear of the blades of the double-suction fan that circulates the circulating gas as much as possible while maintaining the dust removal capability of the dust collector even if the CDQ equipment is operated by changing the air volume of the circulating gas circulating. An object of the present invention is to provide a multi-cyclone dust collector used for a CDQ facility that can be used and a method for operating the CDQ facility.

The multi-cyclone dust collector used in the CDQ facility according to the first invention in accordance with the above object collects the sensible heat of the circulating gas generated from the cooling chamber of the red hot coke by the boiler, and the circulating gas that has passed through the boiler is recovered. A cyclone dust collector and suction ports on the left and right, and sent to the cooling chamber via a double suction fan connected to the secondary side of the multicyclone dust collector, and the circulating gas from the steady load operation and the steady load operation In CDQ equipment that alternately performs low-load operation to reduce the air volume of
The multi-cyclone dust collector is divided into (1 + 2n) compartments each having a plurality of unit cyclones, and an open / close damper is provided to turn on and off the circulating gas passing through the compartments. Control means is provided to open and close the open / close damper according to the air volume of the circulating gas while equalizing the air volumes of the left and right suction ports of the suction fan, and the dust concentration passing through the both suction fans is a constant value. Hold below.

In other words, during low load operation, the wind speed of the circulating gas passing through the unit cyclone is maintained at or near the same conditions as in steady load operation, so that the dust collection efficiency is maintained at a high level and is removed during steady load operation. High particle size dust, which is particularly harmful for both suction fans, is also positively removed.

In the multi-cyclone dust collector used in the CDQ facility according to the first aspect of the present invention, it is preferable that the open / close dampers are respectively provided on the entrance side and the exit side of each of the divided sections. Here, if the open / close damper is provided only on the entry side or the exit side of the section, when operating only a part of the plurality of sections, the circulating gas may bypass other sections, which is not preferable.

In the multi-cyclone dust collector used in the CDQ facility according to the first aspect of the invention, the wind speed of the circulating gas flowing through the unit cyclone during the low load operation is in a range of 67% to 120% of the wind speed during the steady load operation. It is preferable to control. Note that it is preferable to increase the wind speed of the circulating gas flowing through the unit cyclone because the dust removal capability is improved, but it is sufficient to set it to 67% or more, more preferably 80% or more during steady load operation.

In the multi-cyclone dust collector used in the CDQ facility according to the first aspect of the invention, the value of the number of the sections (1 + 2n) is preferably 3 or 5. When the number of compartments is 3, the structure of the facility is simple, but as the number increases, the device configuration becomes complicated, so it is preferable to set the maximum to 5. Note that the present invention is also applied to the case where the widths of the sections arranged symmetrically (divided equally on the left and right) are different.

The operation method of the CDQ facility according to the second aspect of the present invention, wherein the sensible heat retained by the circulating gas generated from the cooling chamber of the red hot coke is recovered by a boiler, and the circulating gas that has passed through the boiler is collected by a multi-cyclone dust collector. And a suction port on the left and right, and sent to the cooling chamber via a double suction fan connected to the secondary side of the multi-cyclone dust collector, and further, the air flow rate of the circulating gas from the steady load operation and the steady load operation. In the operation method of CDQ equipment that alternately performs low-load operation to reduce,
The multi-cyclone dust collector is divided equally into (1 + 2n) sections each having a plurality of unit cyclones, and an open / close damper for turning on and off the circulating gas passing through each section is provided.
A first step of opening all the open / close dampers of the respective sections of the multi-cyclone dust collector during the steady load operation and performing the steady load operation of the both suction fans;
During the low load operation, the air volume of the both suction fans is reduced from that during the steady load operation, and the air volumes of the left and right suction ports of the both suction fans are equalized, while depending on the air volume of the circulating gas. A second step of opening and closing the open / close damper to ensure the wind speed of the section through which the circulating gas passes and to keep the dust concentration contained in the circulating gas below a certain value.

In the operation method of the CDQ facility according to the second invention, the wind speed of the circulating gas flowing through the unit cyclone during the low load operation is controlled within a range of 67% to 120% of the wind speed during the steady load operation. Good. Note that it is preferable to increase the wind speed of the circulating gas flowing through the unit cyclone because the dust removal capability is improved, but it is sufficient to set it to 80% or more during steady load operation.

The multi-cyclone dust collector used in the CDQ facility according to the first invention and the CDQ facility operating method according to the second invention divide the multi-cyclone dust collector into symmetrical sections, and open / close dampers in the respective sections. Since the air speed that passes through the unit cyclone can be maintained by switching the open / close damper according to the flow rate of the circulating gas, the dust collection efficiency of the unit cyclone can be ensured even during low-load operation. , Dust having a large particle size can be prevented from passing through the unit cyclone.
As a result, the dust concentration in the circulating gas can be kept constant even during low-load operation, and dust with a large particle size can be reliably removed by each unit cyclone, which significantly reduces the wear on the blades of both suction fans. And long life.
In addition, since the multi-cyclone dust collector is divided into left and right symmetrical sections, the circulating gas can be evenly flowed to the left and right suction ports of the both suction fans.

In particular, in the multi-cyclone dust collector used in this CDQ facility, when the open / close dampers are provided on the inlet side and the outlet side of each divided section, the flow of the circulating gas is unified and the multi-cyclone dust collector Unnecessary flow in the apparatus can be prevented.

It is explanatory drawing of CDQ equipment containing the multi cyclone dust collector used for CDQ equipment concerning the 1st and 2nd embodiment of the present invention. It is a schematic diagram from the upper surface of the detailed piping which connects the multi cyclone dust collector of the multi cyclone dust collector used for the CDQ equipment which concerns on the 1st Embodiment of this invention, and a double suction fan. (A)-(c) is explanatory drawing which shows the operation state of the multi cyclone dust collector, (d) is explanatory drawing which shows operation | movement of the multi cyclone dust collector which concerns on other embodiment of this invention. It is explanatory drawing of the operation state of the multi cyclone dust collector used for the CDQ installation which concerns on the 1st Embodiment of this invention. It is explanatory drawing of the multi cyclone dust collector used for the CDQ installation which concerns on the 2nd Embodiment of this invention. (A)-(d) is operation | movement explanatory drawing of the multi cyclone dust collector used for the CDQ installation. (A), (b) is a graph explaining the operation | movement and wear amount of the multi cyclone dust collector which concerns on a prior art example, (c), (d) is used for the CDQ installation which concerns on the 2nd Embodiment of this invention. It is a graph which shows the operation | movement and wear amount of a multi cyclone dust collector. (A), (b), (c) is a graph which respectively shows the relationship between air volume (wind speed), dust collection efficiency, average particle diameter ratio, and wear amount ratio.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 to 3, the CDQ equipment 10 including the multi-cyclone dust collector 22 used in the CDQ equipment according to the first embodiment of the present invention includes a red hot coke cooling chamber 11 and a cooling chamber 11. A sensible heat recovery boiler 13 that recovers the sensible heat of the circulating gas that is emitted and connected to the cooling chamber 11 via a dust catcher 12; a multi-cyclone dust collector 15 that recovers dust from the circulating gas that has passed through the boiler 13; Both the suction ducts 18 and 19 are connected to the secondary ducts 16 and 17 of the cyclone dust collector 15, respectively, and both the suction fans 20 are connected to the cooling duct (mainly nitrogen gas) as a circulation gas for cooling. The red-hot coke 21 in the chamber 11 is cooled and the heat is recovered by the boiler 13.

In addition, the multi cyclone dust collector 15, the both suction type fan 20, and a control means are provided, and the multi cyclone dust collector 22 attached to the CDQ equipment 10 is comprised.
The CDQ equipment 10 has a steady load operation in which the cooling gas flow rate (circulation gas flow rate) for cooling the red hot coke 21 filled in the cooling chamber 11 is 100%, and a circulation gas flow rate of about 33 from the steady load operation. The low load operation which is reduced to ~ 40% is alternately performed. The low-load operation is performed when the amount of reddish coke treated decreases, for example, when the reddish coke supply from the coke oven is temporarily stopped.

In this embodiment, the multi-cyclone dust collector 15 connected to the boiler 13 via the connection duct 23 includes three divided sections (an example of 1 + 2n) 24 to 26 having the same size. -26 are provided with a large number of unit cyclones 27 of the same number and the same shape.
Opening and closing dampers 28 to 33 for turning on and off the circulating gas passing therethrough are provided on the upstream side and the downstream side of the compartments 24 to 26, respectively, and the opening and closing damper 28 on the upstream side of the compartment 24 and the opening and closing damper 31 on the downstream side, The upstream opening / closing damper 29 and the downstream opening / closing damper 32 of the section 25, the upstream opening / closing damper 30 and the downstream opening / closing damper 33 of the section 26 are simultaneously opened and closed, and the sections 24 to 26 can be opened and closed. Yes.

As is well known, the multi-cyclone dust collector 15 includes an entry side room for introducing a circulating gas into each of the compartments 24 to 26, a lower room for collecting separated dust, and an upper room for removing the dust and collecting the circulating gas. The upstream opening / closing dampers 28 to 30 are provided upstream of the entrance room, and the downstream opening / closing dampers 31 to 33 are provided downstream of the upper room. Moreover, although the butterfly open / close damper is used for the open / close dampers 28 to 33, the open / close dampers 28 to 33 provided on the upstream side and the downstream side of the passages of the sections 24 to 26 are provided by control means (not shown). At the same time, it is controlled so as to be fully open or fully closed.

The outlet side of each of the compartments 24 to 26 is connected to the left and right suction ports 18 and 19 of the both suction fans 20 through the secondary ducts 16 and 17, so that the wind is constant in the left and right suction ports 18 and 19. In order to flow evenly, each section 24 to 26 is fully opened (air volume 67 to 100%) as shown in FIG. 3A by the control means, and the sections 24 and 26 are placed as shown in FIG. The compartment 25 is fully open when the compartment is fully open (air volume 34 to 67%), and the compartments 24 and 26 are fully closed and the compartment 25 is fully open (air amount 33% or less) as shown in FIG. It has a structure that can adjust the dust collection air volume. In this embodiment, each of the sections 24 to 26 is an equal area. For example, as shown in FIG. 3D, the sections 35 and 37 are divided into 30% and the section 36 is divided into the remaining 40%. You can also.

In the multi-cyclone dust collector 22 according to this embodiment, as shown in FIG. 3A in the steady load operation, each of the sections 24 to 26 is operated in a fully open state, but when performing a low load operation. Then, the rotational speed of the double suction fan 20 or the opening degree of the suction damper (provided on both incoming sides of the double suction fan) is gradually lowered to lower the air volume. Then, as shown by a point a in FIG. 4, the steady load operation is performed at 100%, and the open / close dampers 29 and 32 of the central section 25 are closed at a point b where the air volume becomes, for example, 67% in the steady load operation. As a result, only the compartments 24 and 26 on both sides are operated, so that the air volume (wind speed) flowing through the unit cyclone 27 in the compartments 24 and 26 increases as shown in the point c, which is the same as that in the steady load operation. This also increases the dust collection efficiency as shown in FIG. Therefore, the large particle size dust contained in the circulating gas is removed.

In this state, if the air volume of both suction fans 20 is further reduced to point e, the wind speed of each unit cyclone 27 is lowered and the dust collection efficiency is also lowered. Therefore, at the time point e when the total air volume becomes 34% of the steady load operation, as shown in FIG. 3C, the open / close dampers 28, 31, 30, 33 of the left and right sections 24, 26 are closed, Only the center section 25 is operated. As a result, the amount of air passing through the unit cyclone 27 in the section 25 increases as indicated by a point f, dust collection efficiency is increased, and large-diameter dust is also removed. Since the wind speed of the double suction fan 20 is reduced and the dust collection efficiency of the multi-cyclone dust collector 15 is not changed, the dust concentration passing through the double suction fan 20 can be kept below a certain value, which is significantly higher than in the past. Wear of the blades of both suction fans 20 can be reduced.
In the case where the minimum air volume (for example, the air volume during low load operation is set to 40% of the steady load operation) is changed without changing the dust collection efficiency of the multi-cyclone dust collector 15, for example, as shown in FIG. Thus, what is necessary is just to divide the processing amount of each division 24-26 symmetrically.

In the above-described embodiment, the air volume of the circulating gas is 67% and the section 25 is closed. However, for example, the air volume of the circulating gas is 70 to 80% and the section 25 can be closed. In this case, the wind speed of the circulating gas that passes through the unit cyclones 27 in the compartments 24 and 25 temporarily exceeds 100% (for example, 120%), but since the amount of coke in the cooling chamber 11 is small at this time, the pressure loss There are few, and a problem does not arise in particular.

Subsequently, a multi-cyclone dust collector 41 used in the CDQ facility 40 according to the second embodiment of the present invention will be described with reference to FIGS. 1 and 5 to 7.
The basic configuration of the CDQ facility 40 is the same as that of the CDQ facility 10 shown in FIG. 1, but the configuration of the multicyclone dust collector 42a constituting the multicyclone dust collection facility 41 is different, and the five sections (1 + 2n) are symmetrically arranged. Example) Divided into 42 to 46. Opening and closing dampers 47 and 48 that open and close simultaneously are provided on the upstream side and the downstream side of the sections 42 to 46, respectively.

Then, the control means (not shown) switches the open / close dampers 47 and 48 of the respective sections 42 to 46 in response to fluctuations in the air volume of the both suction fans 20, as shown in FIGS. 6 (a) to (d). In addition, the air volume is switched to four stages of 100%, 80%, 60%, and 40%, and the wind speeds of the secondary ducts 16 and 17 are maintained uniformly.

This state will be described with reference to FIGS. 7C and 7D. In a steady load operation with 100% air volume, all of the open / close dampers 47 and 48 are opened and the circulating gas is supplied to all of the sections 42 to 46. Shed. As a result, the unit cyclones in each of the compartments 42 to 46 operate at 100% air volume, the dust collection efficiency is high, and the amount of wear of the blades of the both suction fans 20 is minimized (this state is set to 1).

Next, in the case of low-load operation, with each of the compartments 42 to 46 fully opened, the rotational speed of the suction fans 20 or the opening of the suction damper is gradually reduced to make the air volume 80%. This state is shown by pq in FIG. 7 (c). Since the air volume of each unit cyclone constituting the multi-cyclone dust collector 42a is reduced to 80%, the dust collection efficiency is determined from the graph shown in FIG. 8 (a). Go down. When the dust collection efficiency decreases, large dust increases, and the wear amount ratio increases (about three times) from FIG. This state is shown in FIG.
Therefore, as shown in FIG. 6B, when the compartments 42, 43, 45, 46 are opened and the compartment 44 is closed, the passing air volume of the multi-cyclone dust collector 42a becomes 80% of the steady state, and the compartments 42, 43, The wind speeds of the unit cyclones 45 and 46 return to 100% (r in FIG. 7C), so that the dust collection efficiency can be maintained and the blade wear amount is reduced.

Next, the rotational speed of the suction damper or the opening degree of the suction damper of both suction fans 20 is lowered (qs in FIG. 7C), and the air volume is set to 60% of the steady load operation (FIG. 7C ))) And the wind speed of the unit cyclones in the four compartments 42, 43, 45, and 46 are lowered, so that the dust collection efficiency is lowered, and as a result, the amount of blades of the double-suction fan 20 is increased (FIG. 7 ( d)).
Therefore, as shown in FIG. 6C, when the compartments 43 to 45 are opened and the compartments 42 and 46 are closed, the passing air volume of the multi-cyclone dust collector 42a becomes 60% of the steady state, and the unit cyclones in the compartments 43 to 45 are obtained. Since the wind speed of the airflow returns to 100%, the dust collection efficiency can be maintained and the amount of blade wear is reduced.

In this state, the rotational speed of both suction fans 20 or the opening of the suction damper is further lowered to lower the air volume to 40% of the steady load operation (st in FIG. 7 (c)). Unit cyclone wind speed decreases and dust collection efficiency decreases. As a result, the wear amount of the blades increases as shown in FIG. 7D. Therefore, as shown in FIG. 6D, the open / close dampers 47, 48 of the compartments 42, 44, 46 are closed again, and the compartment 43 When the open / close dampers 47, 48 are opened, the wind speed of each unit cyclone in the compartments 43, 45 returns to 100%, so that the dust collection efficiency can be maintained and the amount of blade wear is reduced.
By performing the above control, when the air volume of both suction fans 20 is gradually reduced to low load operation (for example, 40% of steady load operation), the amount of blade wear of both suction fans 20 is significantly reduced. be able to.

FIGS. 7 (a) and 7 (b) show the operation of the CDQ facility according to the prior art and the multi-cyclone dust collector used therefor, but switching from 100% air volume steady load operation to 40% load low load operation. In this case, the multi-cyclone dust collector is operated without partitioning. In this case, since the air volume (wind speed) of each unit cyclone of the multi-cyclone dust collector is reduced to about 40%, the dust collection efficiency is reduced to about 55 to 60% as is apparent from FIG.
Further, when the wind speed of the unit cyclone is lowered, the separation limit particle diameter by the cyclone is increased, so that the average particle diameter of the dust is increased.

When this number is specifically described, for example, when the air volume of the circulating gas containing 10 g / Nm ³ of dust is reduced from 100% to 40%, as shown in FIG. Is about 40% lower, and the average particle size of the dust is confirmed to be 1.44 times as shown in FIG. Therefore, in a multi-cyclone dust collector that does not divide each room of the dust collector, as shown in FIG. 8 (c), when the air volume is reduced to about 40%, the wear amount of the fans of both suction fans 20 is increased about 16 times. It will be.

The present invention is not limited to the above-described embodiment, and the operation status within a range not changing the gist of the present invention can be changed. For example, in the above-described embodiment, switching from steady load operation to low load operation is performed in three stages or four stages. However, it may be performed in multiple stages or two stages, and in some cases in one stage.

10: CDQ equipment, 11: cooling chamber, 12: dust catcher, 13: boiler, 15: multi cyclone dust collector, 16, 17: secondary duct, 18, 19: suction port, 20: double suction fan, 21: Red hot coke, 22: Multi-cyclone dust collector, 23: Connection duct, 24-26: Section, 27: Unit cyclone, 28-33: Open / close damper, 35-37: Section, 40: CDQ equipment, 41: Multi-cyclone collector Dust device, 42a: Multi-cyclone dust collector, 42-46: Section, 47, 48: Opening and closing damper

Claims (6)

The sensible heat of the circulating gas generated from the cooling chamber of the red hot coke is collected by a boiler, and the circulating gas that has passed through the boiler is equipped with a multi-cyclone dust collector and suction ports on the left and right, and on the secondary side of the multi-cyclone dust collector. In a CDQ facility that alternately sends a steady load operation and a low load operation that reduces the air volume of the circulating gas from that during the steady load operation, which is sent to the cooling chamber through a connected double suction fan.
The multi-cyclone dust collector is divided into (1 + 2n) compartments each having a plurality of unit cyclones, and an open / close damper is provided to turn on and off the circulating gas passing through the compartments. Control means is provided to open and close the open / close damper according to the air volume of the circulating gas while equalizing the air volumes of the left and right suction ports of the suction fan, and the dust concentration passing through the both suction fans is a constant value. A multi-cyclone dust collector used in a CDQ facility, characterized by being held below. 2. The multi-cyclone dust collector according to claim 1, wherein the open / close dampers are respectively provided on the entrance side and the exit side of each of the divided sections. The multi-cyclone dust collector according to claim 1 or 2, wherein the wind speed of the circulating gas flowing through the unit cyclone during the low load operation is controlled in a range of 67% to 120% of the wind speed during the steady load operation. Multi-cyclone dust collector used for CDQ equipment characterized by The multi-cyclone dust collector used in the CDQ equipment according to claim 1 or 2, wherein the value of (1 + 2n) is 3 or 5. The sensible heat of the circulating gas generated from the cooling chamber of the red hot coke is collected by a boiler, and the circulating gas that has passed through the boiler is equipped with a multi-cyclone dust collector and suction ports on the left and right, and on the secondary side of the multi-cyclone dust collector. In the operation method of the CDQ equipment, the two-suction fan connected to the cooling chamber is sent to the cooling chamber, and the steady load operation and the low load operation in which the air volume of the circulating gas is reduced alternately during the steady load operation are alternately performed.
The multi-cyclone dust collector is divided equally into (1 + 2n) sections each having a plurality of unit cyclones, and an open / close damper for turning on and off the circulating gas passing through each section is provided.
A first step of opening all the open / close dampers of the respective sections of the multi-cyclone dust collector during the steady load operation and performing the steady load operation of the both suction fans;
During the low load operation, the air volume of the both suction fans is reduced from that during the steady load operation, and the air volumes of the left and right suction ports of the both suction fans are equalized, while depending on the air volume of the circulating gas. A CDQ comprising: a second step of opening and closing the open / close damper to ensure the wind speed of the section through which the circulating gas passes and to keep the dust concentration contained in the circulating gas below a certain value. How to operate the equipment. 6. The method of operating a CDQ facility according to claim 5, wherein the wind speed of the circulating gas flowing through the unit cyclone during the low load operation is controlled in a range of 67% to 120% of the wind speed during the steady load operation. The operation method of CDQ equipment.

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