JP2014173754A - Exhaust gas treatment equipment and exhaust gas treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide exhaust gas treatment equipment and an exhaust gas treatment method that enable exhaust of black smoke to be suppressed by collecting dust from exhaust gas exhausted from furnace equipment and at the same time prevent abnormal combustion of exhaust gas within a flue even when the dust collecting treatment for exhaust gas is rapidly stopped due to unforeseen contingency.SOLUTION: Furnace equipment and a chimney 15 are communicated with each other by a flue 2 which is branched to a main flue 3 for guiding exhaust gas G1 from furnace equipment through a dust collector 9 to a prescribed location within the chimney 15 and a sub flue 4 for guiding the exhaust gas G1 from the furnace equipment without passing through the dust collector 9 to a lower location as compared with the prescribed location within the chimney 15. The sub flue 4 is always opened for a period in which the exhaust gas G1 should be exhausted, the exhaust gas G1 is sucked along the main flue 3 to the dust collector 9 and at the same time exhaust gas G2 from which dust has been collected by the dust collector 9 is fed into the chimney 15 along the main flue 3 and a pressure in the chimney on the chimney side at an interface portion between the chimney 15 and the sub flue 4 is made higher as compared with the pressure on the sub flue side.

Description

  The present invention relates to an exhaust gas treatment apparatus and an exhaust gas treatment method for collecting and exhausting exhaust gas from furnace equipment such as a coke oven.

  Conventionally, exhaust gas from a coke oven is exhausted from the chimney to the outside (in the atmosphere) after dust collection processing. Generally, a coke oven is provided with many carbonization chambers in which coal is charged and combustion chambers for burning coal in the carbonization chamber. These multiple carbonization chambers and combustion chambers are adjacent to each other through the furnace wall. Coal charged into each carbonization chamber is heated and dry-distilled by the combustion of fuel gas in each adjacent combustion chamber, thereby becoming coke. In such a coal carbonization process, volatile matter in the coal is generated as coal gas. Coal gas is led out of the coke oven by a suction blower and processed in a gas purification process. On the other hand, the fuel gas in each combustion chamber heats and coal-distills the coal in the carbonization chamber through the furnace wall, and then flows as combustion exhaust gas from each combustion chamber to the flue through the heat storage chamber and the exhaust valve. This flue is a pipe line connecting the coke oven and the chimney, and the combustion exhaust gas from the coke oven is discharged from the chimney to the outside through this flue.

  The furnace wall between the carbonization chamber and the combustion chamber of the coke oven described above is constructed by, for example, silica brick. Therefore, many brick joints exist in the furnace wall. In such a coke oven, joint wall breakage may occur with aging. In this case, coal gas flows from the carbonization chamber into the combustion chamber through the jointed portion of the furnace wall, and this coal gas is discharged from the chimney through the flue along with the combustion exhaust gas from the combustion chamber. That is, the combustion exhaust gas from the coke oven becomes black smoke due to incomplete combustion of the coal gas flowing into the combustion chamber, and as a result, the black smoke is discharged from the chimney.

  In addition, the above-mentioned discharge of black smoke becomes an environmental problem such as pollution. Therefore, when exhaust gas from a coke oven such as combustion exhaust gas is discharged from a chimney, a measure for suppressing black smoke discharge is naturally necessary. As a conventional technique related to such black smoke emission countermeasures, for example, a dust collector and a blower are installed in the flue from the coke oven to the chimney, the exhaust gas from the coke oven is collected to remove black smoke, and this dust collection treatment There exists what sends back exhaust gas to a chimney with a blower (refer to patent documents 1-4).

JP 2000-265171 A JP 2003-64370 A JP 2003-82357 A JP 2010-11824 A

  However, in the above-described prior art, when the dust collector blower suddenly stops due to an unexpected situation such as a large-scale power outage or natural disaster, the distribution of the exhaust gas in the flue is stagnated. Exhaust gas from furnaces such as furnaces cannot be discharged from the chimney to the outside (in the atmosphere). As a result, there is a risk that the exhaust gas abnormally burns in the flue.

  The present invention has been made in view of the above circumstances, and it is possible to suppress the emission of black smoke by collecting the exhaust gas from the furnace equipment, and the exhaust gas dust collection process suddenly stops due to an unexpected situation. Even if it is a case, it aims at providing the exhaust gas processing apparatus and the exhaust gas processing method which can prevent abnormal combustion of the exhaust gas in a flue.

  In order to solve the above-described problems and achieve the object, an exhaust gas treatment apparatus according to the present invention is an exhaust gas treatment apparatus that collects exhaust gas from a furnace facility by a dust collector and discharges it from a chimney. A main flue that guides the exhaust gas to a predetermined site in the chimney via a dust collector, and guides the exhaust gas from the furnace equipment to a site lower than the predetermined site in the chimney without going through the dust collector. A flue that branches into a secondary flue to communicate the furnace facility with the chimney, a flue valve that always opens the secondary flue during a period in which the exhaust gas should be discharged, and the main flue The exhaust gas is sucked into the dust collector along the exhaust gas, and the exhaust gas after the dust collection processing by the dust collector is sent into the chimney along the main flue, at a boundary portion between the chimney and the sub flue The chimney side pressure is reduced to the secondary smoke. Characterized by comprising a suction blower to higher than the pressure side, a.

  Moreover, the exhaust gas treatment apparatus according to the present invention is characterized in that, in the above-mentioned invention, the outlet side opening end portion of the auxiliary flue is connected to a lower portion of the chimney.

  Moreover, the exhaust gas treatment apparatus according to the present invention is characterized in that, in the above-described invention, the exhaust gas treatment apparatus further includes a wind direction adjusting unit that adjusts a wind direction of the exhaust gas after the dust collection process flowing into the chimney from the main flue. To do.

  Moreover, the exhaust gas treatment apparatus according to the present invention is the above-described invention, wherein a dust meter that measures the amount of dust in the exhaust gas after the dust collection process discharged from the chimney, and the dust amount measured by the dust meter. And a control unit that controls the wind direction adjusting unit so as to change the wind direction of the exhaust gas after the dust collection process to the lower side.

  Moreover, the exhaust gas treatment apparatus according to the present invention is characterized in that, in the above-described invention, an exit side opening size of the auxiliary flue decreases toward the chimney side.

  In the exhaust gas treatment apparatus according to the present invention as set forth in the invention described above, the flue valve partially closes an opening in the auxiliary flue.

  Further, the exhaust gas treatment method according to the present invention is the exhaust gas treatment method in which exhaust gas from the furnace equipment is collected by a dust collector and discharged from the chimney, and the furnace equipment is provided by a flue communicating the furnace equipment and the chimney. A dust collection path for guiding the exhaust gas from the furnace equipment to a predetermined part in the chimney through the dust collector, and the exhaust gas from the furnace equipment to a lower part than the predetermined part in the chimney without going through the dust collector A temporary path that guides the exhaust gas, and during the period in which the exhaust gas is to be discharged, the temporary path is always open, the exhaust gas is sucked into the dust collector along the dust collection path, and after the dust collection process by the dust collector The exhaust gas is sent into the chimney along the dust collection path, and the pressure on the exit side of the temporary path in the chimney is made higher than the pressure of the temporary path.

  The exhaust gas treatment method according to the present invention is characterized in that, in the above invention, an outlet end of the temporary path is connected to a lower part of the chimney.

  Further, in the exhaust gas treatment method according to the present invention, in the above invention, the wind direction of the exhaust gas after the dust collection process that flows into the chimney from the dust collection path is adjusted, and the temporary path exits in the chimney. It is characterized by supporting the pressure increase on the side.

  Further, the exhaust gas treatment method according to the present invention is the above invention, wherein the dust collection amount in the exhaust gas after the dust collection treatment discharged from the chimney is measured, and the dust collection is accompanied by an increase in the measured dust collection amount. The wind direction of the exhaust gas after treatment is changed to the lower side.

  Moreover, the exhaust gas treatment method according to the present invention is characterized in that, in the above-mentioned invention, the exit side opening size of the flue forming the temporary path is reduced toward the chimney side.

  The exhaust gas treatment method according to the present invention is characterized in that, in the above-mentioned invention, the opening of the temporary path is partially closed.

  According to the present invention, exhaust gas from the furnace equipment can be collected to suppress black smoke emission, and even if the exhaust gas dust collection process suddenly stops due to an unexpected situation, There is an effect that abnormal combustion of exhaust gas can be prevented.

FIG. 1 is a diagram illustrating a configuration example of an exhaust gas treatment apparatus according to a first embodiment of the present invention. FIG. 2 is a diagram for explaining the exhaust gas treatment method according to the first embodiment of the present invention. FIG. 3 is a diagram for explaining the wind direction control of the exhaust gas flowing from the main flue into the chimney. FIG. 4 is a diagram illustrating a configuration example of the exhaust gas treatment apparatus according to the second embodiment of the present invention.

  Hereinafter, preferred embodiments of an exhaust gas treatment apparatus and an exhaust gas treatment method according to the present invention will be described in detail with reference to the accompanying drawings. In the following, the present invention will be described by exemplifying an exhaust gas treatment apparatus and an exhaust gas treatment method applied to a coke oven, but the present invention is not limited to the present embodiment.

(Embodiment 1)
First, the configuration of the exhaust gas treatment apparatus according to the first embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a configuration example of an exhaust gas treatment apparatus according to a first embodiment of the present invention. As shown in FIG. 1, the exhaust gas treatment apparatus 1 includes a flue 2 that branches into a main flue 3 and a sub flue 4 to form an exhaust gas distribution path, a flue valve 5 of the sub flue 4, The pressure adjustment valve 6 of the flue 2, the gas flow rate adjustment valve 7 of the main flue 3, the shut-off valve 8 of the main flue 3, the dust collector 9, the suction blower 10, and the wind direction at the outlet of the main flue 3 An adjustment unit 11, a dust meter 13 and a control unit 14 for controlling the wind direction adjustment unit 11, and a chimney 15 are provided.

  The flue 2 communicates the coke oven 16 and the chimney 15 to form an exhaust gas circulation path that leads from the coke oven 16 to the chimney 15. In detail, the open end of the inlet side of the flue 2 is connected to the coke oven 16. As shown in FIG. 1, the exit side of the flue 2 branches into a main flue 3 and a sub flue 4, and the open ends of the exit sides of the main flue 3 and the sub flue 4 are chimneys. 15 is connected. In this way, the flue 2 branches into the main flue 3 and the sub flue 4 and communicates the coke oven 16 and the chimney 15.

  The main flue 3 forms an exhaust gas flow path (hereinafter referred to as a dust collection path R1) that guides the exhaust gas from the coke oven 16 from the coke oven 16 to the predetermined part in the chimney 15 via the dust collector 9. The main flue 3 guides the exhaust gas G1 from the coke oven 16 to the dust collector 9 and guides the exhaust gas G2 passing through the dust collector 9 into the chimney 15 along the dust collection path R1. The exhaust gas G2 is exhaust gas obtained by collecting the exhaust gas G1 by the dust collector 9, that is, exhaust gas after the dust collection processing from the coke oven 16.

  The auxiliary flue 4 forms an exhaust gas flow path (hereinafter referred to as a temporary path R2) that guides the exhaust gas from the coke oven 16 to the low part in the chimney 15 without passing through the dust collector 9 from the coke oven 16. Here, the low part in the chimney 15 is a part that is lower than the predetermined part in the chimney 15 in which the main chimney 3 leads the exhaust gas G2 described above. For example, as shown in FIG. It is the vicinity part, ie, the chimney lower part 15a. The auxiliary flue 4 appropriately guides the exhaust gas G1 from the coke oven 16 into the chimney 15 along the temporary route R2.

  The flue valve 5 is a valve that adjusts the opening degree of the sub flue 4 by the opening and closing operation of the sub flue 4 (see the double-sided arrow in FIG. 1). The flue valve 5 fully closes the sub flue 4 only during a period during which the exhaust gas treatment device 1 is started up or maintenance is performed in the chimney 15 (hereinafter referred to as a start-up / maintenance period). On the other hand, the flue valve 5 is a period other than the start-up / maintenance period, that is, a period during which the exhaust gas G1 from the coke oven 16 should be collected and discharged from the chimney 15 (hereinafter referred to as a dust collection operation period). The auxiliary flue 4 is always opened, for example, fully open.

  The pressure regulating valve 6 is arranged on the upstream side (coke oven 16 side) as compared with the branch portion of the main flue 3 and the sub flue 4 in the flue 2. The pressure adjustment valve 6 adjusts the opening degree of the flue 2, and thereby adjusts the pressure in the flue 2 of the exhaust gas G <b> 1 from the coke oven 16.

  The gas flow rate adjusting valve 7 is disposed in a predetermined portion of the main flue 3 (for example, in the vicinity of a branch portion between the main flue 3 and the sub flue 4). The gas flow rate adjusting valve 7 adjusts the flow rate of the exhaust gas G1 flowing from the coke oven 16 to the main flue 3.

  The shut-off valve 8 is disposed between the gas flow rate adjustment valve 7 in the main flue 3 and the dust collector 9. The shut-off valve 8 opens and closes the flue portion of the main flue 3 that leads to the dust collector 9, thereby allowing or blocking the flow of the exhaust gas G <b> 1 to the dust collector 9. Specifically, the shutoff valve 8 shuts off the flow of the exhaust gas G1 to the dust collector 9 by closing the main flue 3 only during a period when the dust collector 9 or the like is started up or maintained. On the other hand, the shut-off valve 8 always keeps the main flue 3 open so that the exhaust gas G1 from the coke oven 16 is collected and discharged from the chimney 15 during this period, and the exhaust gas to the dust collector 9 is always opened. Allow distribution of G1.

  The dust collector 9 collects the exhaust gas G <b> 1 from the coke oven 16. Specifically, the dust collector 9 is realized using an electric dust collector, a bag filter, or the like, and is disposed between the shut-off valve 8 in the main flue 3 and the suction blower 10. The dust collector 9 performs a dust collection process on the exhaust gas G1 flowing into the main flue 3 from the branch part of the flue 2 shown in FIG. 1, and thereby dust such as black smoke and soot contained in the exhaust gas G1. Remove particles. As a result, the dust collector 9 generates the exhaust gas from which dust particles are removed from the exhaust gas G1, that is, the exhaust gas G2 after the dust collection process.

  The suction blower 10 distributes the exhaust gas G1 to be collected from the coke oven 16 side to the dust collector 9 along the main flue 3, and distributes the exhaust gas G2 from the dust collector 9 toward the chimney 15. Specifically, the suction blower 10 has a stronger suction function than the conventional suction blower used for the conventional exhaust gas dust collection treatment, and is disposed at the rear stage of the dust collector 9 in the main flue 3. Is done. The suction blower 10 sucks the exhaust gas G1 into the dust collector 9 along the main flue 3. In this case, the suction blower 10 sucks the exhaust gas G1 into the main flue 3 from the coke oven 16 toward the dust collector 9, and part of the exhaust gas G1 in the sub flue 4 toward the dust collector 9. Aspirate from 4 to main flue 3. At the same time, the suction blower 10 sends (blows) the exhaust gas G2 after the dust collection processing by the dust collector 9 into the chimney 15 along the main flue 3. Due to the synergistic action of the suction function and the air blowing function, the suction air blower 10 applies the pressure on the chimney 15 side (for example, the chimney lower part 15a shown in FIG. 1) at the boundary portion between the chimney 15 and the sub flue 4 to the sub flue 4 Higher than the side pressure. The conventional suction blower described above sucks the exhaust gas G1 from the coke oven 16 toward the dust collector 9 into the main flue 3 when the sub flue 4 is fully closed by the flue valve 5. It is.

  The wind direction adjusting unit 11 adjusts the wind direction of the exhaust gas G2 after the dust collection process that flows into the chimney 15 from the main flue 3. Specifically, the wind direction adjusting unit 11 includes a wind direction regulating plate 12 that regulates the wind direction of the exhaust gas G2, and the exhaust gas G2 from the main flue 3 into the chimney 15 is provided at the outlet side opening end of the main flue 3. It is arranged so as not to hinder the inflow of water. The wind direction adjusting unit 11 tilts the wind direction regulating plate 12 in a predetermined circumferential direction (for example, a rotational direction around an axis perpendicular to the height direction of the chimney 15) by a rotation mechanism (not shown). Thus, the wind direction adjusting unit 11 adjusts the inclination of the wind direction regulating plate 12 with respect to the outlet side opening end portion of the main flue 3, and through the adjustment of the inclination of the wind direction regulating plate 12, the air direction regulating plate 12 enters the chimney 15. The inflow direction of the exhaust gas G2 is adjusted.

  The soot meter 13 is arranged in the upper part of the chimney 15 and measures the amount of soot in the exhaust gas G2 after the dust collection process discharged from the chimney 15. The dust meter 13 transmits the measured amount of dust to the control unit 14. The control unit 14 acquires the measurement result of the amount of dust in the exhaust gas G2 from the dust meter 13, and controls the wind direction adjusting unit 11 based on the acquired measurement result. Specifically, the control unit 14 changes the inflow direction (wind direction) of the exhaust gas G2 from the main flue 3 into the chimney 15 to the lower side of the chimney 15 as the amount of the dust measured by the dust meter 13 increases. The wind direction adjusting unit 11 is controlled to change.

  The chimney 15 communicates with the coke oven 16 through the flue 2 including the main flue 3 and the sub flue 4. Specifically, as shown in FIG. 1, the outlet side opening end portion of the main flue 3 is connected to a side wall portion of the chimney 15 having a predetermined height. The connection portion between the main flue 3 and the chimney 15 is formed in a structure in which the coke oven 16 and the chimney 15 communicate with each other through the main flue 3. On the other hand, the outlet side open end 4a of the sub flue 4 is connected to the side wall portion of the chimney lower part 15a of the chimney 15. The connecting portion between the sub flue 4 and the chimney 15 is formed in a structure in which the coke oven 16 and the chimney 15 communicate with each other through the sub flue 4. Such a chimney 15 discharges the exhaust gas G2 after dust collection from the main flue 3 to the outside (in the atmosphere) during a period when the suction fan 10 operates normally, and during the period when the suction fan 10 stops, Exhaust gas G1 from the road 4 is discharged to the outside.

  Here, the outlet side opening end portion 4 a of the sub flue 4 is connected to a lower side wall portion of the side wall of the chimney 15 as compared with a connection portion between the chimney 15 and the main flue 3. In addition, each connection part of the main flue 3 and the sub flue 4 with respect to the chimney 15 is arrange | positioned in the site | part where the exit side opening edge part 4a of the sub flue 4 is lower than the exit side opening edge part of the main flue 3 If desired, a desired portion of the side wall of the chimney 15 may be used. However, from the viewpoint of making it easier to increase the pressure in the chimney 15 than in the auxiliary flue 4, both the connecting portions of the main flue 3 and the auxiliary flue 4 to the chimney 15 are lower parts. Is desirable. For example, it is desirable that the connection portion between the chimney 15 and the main chimney 3 is a lower portion than the central portion of the chimney 15 in the height direction. The connection portion between the chimney 15 and the sub flue 4 is desirably near the bottom of the chimney 15, that is, the chimney lower portion 15a as shown in FIG. Furthermore, it is desirable that the outlet side opening end portion 4 a of the sub flue 4 is disposed below the side wall portion of the chimney 15 facing the outlet side opening end portion of the main flue 3.

  The coke oven 16 is an example of furnace equipment to which the exhaust gas treatment apparatus 1 according to the present invention is applied. Although not specifically shown, the coke oven 16 has a large number of carbonization chambers and combustion chambers that are adjacent to each other via a furnace wall. The coal in each carbonization chamber is heated and dry-distilled by combustion of the combustion gas in each combustion chamber. To produce coke. Each combustion chamber of such a coke oven 16 is connected to the inlet opening end of the flue 2 of the exhaust gas treatment device 1. That is, the exhaust gas G1 flowing from the coke oven 16 into the flue 2 is mainly combustion exhaust gas from each of these combustion chambers. On the other hand, coal gas may flow from the carbonization chamber into the combustion chamber due to joint cuts in the coke oven 16. In this case, the coal gas in the combustion chamber becomes incompletely combusted and becomes black smoke, and flows into the flue 2 together with the combustion exhaust gas. In other words, the exhaust gas G1 flowing from the coke oven 16 into the flue 2 may contain black smoke.

The exhaust gas treatment apparatus 1 having the above-described configuration is used when the dust collection process is performed in the flue 2 including the main flue 3 and the sub flue 4 and in the chimney 15 (when the dust collector 9 and the suction fan 10 are in operation). ) To maintain a predetermined exhaust gas pressure balance. That is, the exhaust gas pressure P1 at the position S1 in the flue 2 shown in FIG. 1, the exhaust gas pressures P2 and P3 at the positions S2 and S3 in the chimney 15, and the positions S4 and S5 in the main flue 3 respectively. A pressure balance that satisfies the following expressions (1) to (3) is established between the exhaust gas pressures P4 and P5 and the exhaust gas pressure P6 at the position S6 in the sub flue 4.

P1> P4 (1)
P5>P2>P6> P4 (2)
P3> P5 (3)

  The position S1 is a position in the flue 2 on the upstream side as compared with a branch portion between the main flue 3 and the sub flue 4 (hereinafter abbreviated as a branch portion as appropriate), and the exhaust gas pressure P1 is This is the pressure of the exhaust gas G1 at the position S1. The position S2 is a position in the chimney 15 in the vicinity of the outlet side opening end 4a of the auxiliary flue 4 (in the first embodiment, the position of the chimney lower part 15a), and the exhaust gas pressure P2 is equal to the exhaust gas G2 at the position S2. Pressure. The position S3 is an upper position in the chimney 15, and the exhaust gas pressure P3 is the pressure of the exhaust gas G2 at this position S3. The position S4 is a position near the branch portion in the main flue 3, and the exhaust gas pressure P4 is the pressure of the exhaust gas G1 at this position S4. The position S5 is a position in the vicinity of the outlet side opening end portion (near the chimney 15) in the main flue 3, and the exhaust gas pressure P5 is the pressure of the exhaust gas G2 at this position S5. The position S6 is a position in the vicinity of the outlet side opening end 4a in the sub flue 4, and the exhaust gas pressure P6 is the pressure of the exhaust gas G1 at this position S6. The exhaust gas pressure P1 is a pressure in a direction from the coke oven 16 side toward the chimney 15 side. The exhaust gas pressure P <b> 2 is a pressure in a direction from the chimney 15 toward the outlet side opening end 4 a of the auxiliary flue 4. The exhaust gas pressure P <b> 3 is a pressure in a direction toward the upper opening end of the chimney 15. The exhaust gas pressure P4 is a pressure in the direction from the branch portion of the flue 2 toward the dust collector 9 side. The exhaust gas pressure P5 is a pressure in a direction from the main flue 3 toward the chimney 15 side. The exhaust gas pressure P6 is a pressure in a direction from the sub flue 4 toward the outlet opening end 4a.

  By maintaining the pressure balance (P1> P4) shown in Formula (1), the exhaust gas treatment device 1 can circulate the exhaust gas G1 from the coke oven 16 along the dust collection path R1 and perform a dust collection treatment. . Further, since the exhaust gas pressure P5 is a pressure after being boosted by the suction fan 10, it becomes larger than the exhaust gas pressure P4 at the position S4 on the upstream side of the suction fan 10 as shown in Expression (2). On the other hand, the exhaust gas treatment device 1 maintains not only the coke oven 16 side but also the chimney 15 side by maintaining the pressure balance of the exhaust gas pressures P2, P4, and P6 as shown in the equation (2) (P2> P6> P4). However, the exhaust gas G1 can be circulated along the dust collection path R1 and introduced into the dust collector 9. In particular, the exhaust gas treatment apparatus 1 introduces the exhaust gas G2 (clean gas) after dust collection into the chimney 15 so that the pressure balance of the exhaust gas pressures P2 and P6 satisfies P2> P6. Thereby, the exhaust gas treatment apparatus 1 prevents the emission of the uncollected exhaust gas G1 (dusty exhaust gas) that proceeds toward the chimney 15 without going through the dust collector 9 into the atmosphere via the chimney 15. Can do.

  The pressure balance shown in the equations (1) to (3) is based on the opening degrees of the pressure adjusting valve 6 and the gas flow rate adjusting valve 7 described above, the suction action and the blowing action of the suction blower 10, and the exhaust gas by the wind direction adjusting unit 11. Realized and maintained by adjusting the wind direction of G2. Here, the exhaust gas pressure P <b> 2 at the position S <b> 2 in the chimney 15 is the pressure on the chimney 15 side at the boundary portion between the chimney 15 and the sub-flue 4. The exhaust gas pressure P6 at the position S6 in the auxiliary flue 4 is the pressure on the auxiliary flue 4 side at this boundary portion. Such a pressure balance (P2> P6) between the exhaust gas pressure P2 and the exhaust gas pressure P6 is realized and maintained by the suction action and the air blowing action of the suction blower 10 and the wind direction adjustment of the exhaust gas G2 by the wind direction adjusting unit 11.

  Next, the exhaust gas treatment method according to the first embodiment of the present invention will be described. FIG. 2 is a diagram for explaining the exhaust gas treatment method according to the first embodiment of the present invention. FIG. 3 is a diagram for explaining the wind direction control of the exhaust gas flowing from the main flue into the chimney.

  In the exhaust gas treatment method according to the first embodiment, as shown in FIG. 1, the dust collector 9 is connected from the coke oven 16 using the main flue 3 of the flue 2 communicating with the coke oven 16 and the chimney 15. A dust collection path R1 that leads the exhaust gas to a predetermined part in the chimney 15 is formed. In addition, a temporary route R2 is formed by using the sub-flue 4 of the flue 2 to guide the exhaust gas from the coke oven 16 to a lower part than the predetermined part in the chimney 15 without passing through the dust collector 9. To do. In the dust collection path R1 and the temporary path R2, the side wall portion of the chimney 15 which is lower than the connection portion of the outlet side opening end portion of the main flue 3 with respect to the chimney 15, for example, the side wall of the chimney lower portion 15a, The outlet side open end 4a of the auxiliary flue 4 (that is, the outlet side end of the temporary route R2) is connected.

  As shown in FIG. 1, in the exhaust gas treatment apparatus 1 that forms the dust collection path R1 and the temporary path R2, the dust collection operation period during which the exhaust gas G1 from the coke oven 16 should be collected and discharged, the sub flue 4 The flue valve 5 is kept fully open, and the temporary route R2 is always opened. Further, the pressure regulating valve 6, the gas flow regulating valve 7 and the shutoff valve 8 are opened. As a result, both the dust collection path R1 and the temporary path R2 are opened. Next, the suction blower 10 sucks the exhaust gas G1 into the dust collector 9 along the dust collection path R1, and sends the exhaust gas G2 after the dust collection processing by the dust collector 9 into the chimney 15 along the dust collection path R1. As a result, the pressure on the exit side of the temporary route R2 in the chimney 15 is made higher than the pressure of the temporary route R2. That is, the exhaust gas pressure P2 at the position S2 in the chimney 15 shown in FIG. 1 is made higher than the exhaust gas pressure P6 at the position S6 in the sub flue 4. Further, the respective opening degrees of the pressure regulating valve 6 and the gas flow rate regulating valve 7 are appropriately adjusted, the respective opening degrees of the pressure regulating valve 6 and the gas flow rate regulating valve 7 after the adjustment, the suction action and the blowing action of the suction blower 10. And the pressure balance shown in the above-mentioned formulas (1) to (3) by the wind direction adjustment of the exhaust gas G2 by the wind direction adjusting unit 11 is as follows: inside the flue 2, inside the main flue 3, inside the sub flue 4, and Realized and maintained in the chimney 15.

  In such a dust collection period, as shown in FIG. 2, the exhaust gas G2 continuously flowing from the main flue 3 into the chimney 15 prevents the exhaust gas G1 from flowing into the chimney 15 from the sub flue 4 However, it flows upward from the chimney 15 and is finally discharged from the chimney 15 into the atmosphere. On the other hand, the exhaust gas G1 in the sub flue 4 is prevented from flowing into the chimney 15 side by the exhaust gas G2 in the chimney 15 as described above, and stays at the outlet side open end 4a of the sub flue 4 at the head. A part of the exhaust gas G1 staying in the auxiliary flue 4 flows into the main flue 3 by the suction action of the suction blower 10 together with the exhaust gas G1 that sequentially flows into the flue 2 from the coke oven 16, and the gas flow rate. The regulator valve 7 and the shut-off valve 8 are sequentially passed. Subsequently, the exhaust gas G1 in the main flue 3 circulates along the dust collection path R1, is collected by the dust collector 9, and flows out from the dust collector 9 as the exhaust gas G2. Thereafter, the exhaust gas G2 after the dust collection treatment flows into the chimney 15 from the main flue 3 by the air blowing action of the suction blower 10 as described above, and the inflow of the exhaust gas G1 from the sub flue 4 into the chimney 15 is reduced. The air is discharged from above the chimney 15 while being blocked. As described above, during the dust collection operation period, the dust collection path R1 and the temporary path R2 are both opened, and the exhaust gases G1 and G2 are circulated along the dust collection path R1 and from the dust collection path R1 into the chimney 15. The circulation cycle of the exhaust gases G1 and G2 in which the exhaust gas G1 is prevented from flowing into the chimney 15 from the temporary path R2 by the pressure of the exhaust gas G2 that has flowed in is continuously repeated.

  Further, in the dust collection operation period described above, the inflow direction (wind direction) of the exhaust gas G2 from the main flue 3 into the chimney 15 is adjusted in accordance with the amount of dust in the exhaust gas G2 discharged from the chimney 15. Specifically, as shown in FIG. 3, the dust meter 13 measures the amount of dust in the exhaust gas G <b> 2 discharged from the upper part of the chimney 15 into the atmosphere. The control unit 14 controls the wind direction adjusting unit 11 based on the measurement result of the amount of dust by the dust meter 13. For example, when the measurement result of the dust amount is less than a predetermined threshold, the control unit 14 controls the wind direction adjusting unit 11 so that the wind direction regulating plate 12 is directed upward. Based on the control of the control unit 14, the wind direction adjusting unit 11 turns the wind direction regulating plate 12 upward (state A1) as shown in FIG.

  In this state A <b> 1, the exhaust gas G <b> 2 flowing into the chimney 15 from the main flue 3 is dispersed in the chimney 15 without being substantially restricted by the wind direction restriction plate 12. For this reason, the exhaust gas G2 from the main chimney 3 flows into the chimney 15 and then flows smoothly above the chimney 15 and is easily discharged from the chimney 15 into the atmosphere. On the other hand, of the exhaust gas G2 dispersed in this manner, the exhaust gas G2 flowing toward the chimney lower portion 15a is obtained by changing the exhaust gas pressure P2 at the position S2 in the chimney 15 shown in FIG. The exhaust gas G <b> 1 flowing from the sub flue 4 toward the chimney 15 is pushed back from the outlet side open end 4 a of the sub flue 4 to the inside of the sub flue 4. As a result, the inflow of the exhaust gas G1 from the auxiliary flue 4 into the chimney 15 is prevented.

  Here, when the amount of dust in the exhaust gas G2 measured by the dust meter 13 increases, the control unit 14 controls the wind direction adjusting unit 11 corresponding to the increase in the amount of dust. Based on the control of the control unit 14, the wind direction adjusting unit 11 tilts the wind direction regulating plate 12 downward as the amount of dust increases, and the wind direction of the exhaust gas G <b> 2 flowing into the chimney 15 from the main flue 3. Is changed downward (state A2). In this state A2, the exhaust gas G2 flowing into the chimney 15 from the main flue 3 is regulated by the wind direction regulating plate 12 and flows toward the chimney lower part 15a as shown in FIG. The wind direction adjusting unit 11 adjusts the wind direction of the exhaust gas G2 from the main chimney 3 in this way, and increases the pressure on the exit side of the temporary path R2 in the chimney 15 (position S2 in the chimney 15 shown in FIG. 1). To help. As a result, the pressure balance (P2> P6) between the exhaust gas pressure P2 in the chimney 15 and the exhaust gas pressure P6 in the sub flue 4 is further stabilized. In such a state A2, the exhaust gas G2 in the chimney 15 passes through the exhaust gas G1 flowing from the sub flue 4 into the chimney 15 from the outlet side open end 4a of the sub flue 4 to the inside of the sub flue 4. Push back strongly. In this way, the exhaust gas G2 in the chimney 15 is discharged into the atmosphere from above the chimney 15 while more reliably preventing the exhaust gas G1 from flowing into the chimney 15 from the sub flue 4.

  When the amount of dust in the exhaust gas G2 measured by the dust meter 13 decreases, the control unit 14 controls the wind direction adjusting unit 11 so that the wind direction regulating plate 12 faces upward as the amount of dust decreases. May be. That is, as shown in FIG. 3, the wind direction adjusting unit 11 adjusts the wind direction of the exhaust gas G <b> 2 from the main flue 3 downward along with the increase in the measurement result of the dust amount by the dust meter 13 based on the control of the control unit 14. However, the wind direction of the exhaust gas G2 from the main flue 3 may be adjusted upward as the measurement result of the amount of dust by the dust meter 13 decreases.

  On the other hand, when an unexpected situation such as a large-scale power outage or natural disaster occurs suddenly and the power supply to each facility of the exhaust gas treatment device 1 is thereby cut off, the flue valve 5 and the pressure regulating valve 6 of the exhaust gas treatment device 1 are stopped. The gas flow rate adjusting valve 7, the shutoff valve 8, the dust collector 9, the suction fan 10, the wind direction adjusting unit 11, the dust meter 13, and the control unit 14 (see FIGS. 1 and 2) are suddenly stopped and inoperable. become. In particular, when the suction blower 10 is stopped, suction of the exhaust gas G1 from the coke oven 16 to the dust collector 9 and blowing of the exhaust gas G2 after dust collection processing by the dust collector 9 into the chimney 15 become impossible. That is, the dust collection operation of the exhaust gas treatment device 1 is stopped.

  In such a period when the dust collection operation is stopped (hereinafter referred to as a dust collection stop period), as shown in FIG. 2, exhaust gas distribution along the main flue 3 is impossible due to the stop of the suction fan 10. become. In this case, the inflow of the exhaust gas G2 from the main flue 3 into the chimney 15 is stopped, and as a result, the exhaust gas pressure P2 at the position S2 (see FIG. 1) in the chimney 15 is drastically reduced and the sub flue 4 It becomes lower than the exhaust gas pressure P6 inside. As a result, the ability to prevent the exhaust gas from flowing into the chimney 15 from the auxiliary flue 4 is lost. Here, the flue valve 5 always keeps the sub flue 4 open during the above-described dust collection operation period, and maintains the sub flue 4 open even during the dust collection stop period. Such a sub flue 4 flows the exhaust gas G1 from the coke oven 16 into the chimney 15 immediately after the suction blower 10 is stopped. That is, the exhaust gas treatment apparatus 1 immediately moves from the dust collection operation period to the dust collection stop period, and immediately after the dust collection path R1 via the dust collector 9 passes through the exhaust gas circulation path from the coke oven 16 into the chimney 15. 9 is changed to a temporary route R2 that does not go through 9. In the dust collection stop period, the exhaust gas G1 is smoothly circulated from the coke oven 16 through the auxiliary flue 4 into the chimney 15, and the exhaust gas G1 is discharged from the chimney 15 into the atmosphere. As a result, the situation where the exhaust gas G1 from the coke oven 16 is excessively stagnated in the flue 2 within the dust collection stop period is prevented, and the occurrence of abnormal combustion of the exhaust gas G1 in the flue 2 is avoided.

  Thereafter, when the power source is restored, the exhaust gas treatment device 1 operates the dust collector 9, the suction blower 10, the wind direction adjustment unit 11, the dust meter 13, and the control unit 14 again, so that the coke oven 16 is operated as described above. The dust collection operation for collecting and discharging the exhaust gas G1 is restarted. That is, immediately after the power source is restored, the exhaust gas treatment device 1 changes the exhaust gas distribution path from the coke oven 16 into the chimney 15 from the temporary path R2 not passing through the dust collector 9 to the dust collection path R1 passing through the dust collector 9. To do.

  As described above, in the first embodiment of the present invention, the main smoke that guides the exhaust gas from the coke oven to the predetermined part in the chimney through the dust collector on the chimney side that communicates the coke oven with the chimney. Dust collection that branches from the coke oven to a sub flue that guides the exhaust gas to a lower part than the above-mentioned predetermined part of the chimney without going through the dust collector from the coke oven, and collects and discharges the exhaust gas During the operation period, the secondary flue is not fully closed and the secondary flue is always open. In addition, during this dust collection period, exhaust air is sucked into the dust collector along the main flue by the suction blower, and the exhaust gas after dust collection processing by the dust collector is sent into the chimney along the main flue. The pressure on the chimney side at the boundary between the sub flue and the sub flue is made higher than the pressure on the sub flue side.

  For this reason, during the dust collection operation period, the pressure of the exhaust gas after the dust collection process that has flowed into the chimney from the main flue prevents the exhaust gas from flowing into the chimney from the sub flue, and after the dust collection process, Exhaust gas can be discharged from the chimney to the atmosphere. In addition, by allowing the pressure of the exhaust gas after dust collection in the chimney to be lower than the pressure of the exhaust gas in the sub flue, the inflow of exhaust gas from the sub flue into the chimney can be allowed immediately. it can. That is, when the exhaust gas flow in the main flue is stopped due to the stoppage of the suction blower, a secondary flue can be secured as an emergency flue that distributes the exhaust gas from the coke oven into the chimney instead of the main flue. . Therefore, even if the suction blower suddenly stops due to an unforeseen situation such as a large-scale power outage or natural disaster, the power source and flue valve operation are not required, and the exhaust gas distribution in the main flue is not required. Immediately after stopping, the exhaust gas distribution path can be changed from the main flue to the sub flue. As a result, during the dust collection stop period, exhaust gas can be circulated from the coke oven to the chimney through the secondary flue, and as a result, it is possible to prevent the exhaust gas from the coke oven from being excessively stagnated in the flue. Abnormal combustion of exhaust gas can be prevented. While securing such a secondary flue, the black smoke contained in the exhaust gas from the coke oven is removed by dust collection treatment, so that the black smoke into the atmosphere can be safely and without causing abnormal combustion of the exhaust gas in the flue. Can be suppressed.

  Further, in Embodiment 1 of the present invention, the amount of dust in the exhaust gas discharged from the chimney is measured, and the wind direction of the exhaust gas flowing into the chimney from the main flue is lowered as the measured amount of dust is reduced. It has changed to the side. For this reason, the exhaust gas pressure in the vicinity of the sub flue in the chimney can be increased in accordance with an increase in the amount of dust entering the chimney from the sub flue. As a result, it is possible to easily increase the exhaust gas pressure that prevents the inflow of exhaust gas from the secondary flue into the chimney, and to suppress the entry of soot from the secondary flue into the chimney. It is possible to reduce the amount of soot discharged from the house.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. In the second embodiment, the auxiliary flue that guides the exhaust gas from the coke oven to the chimney without going through the dust collector is configured so that the exit side opening size decreases toward the chimney side.

  First, the configuration of the exhaust gas treatment apparatus according to the second embodiment of the present invention will be described. FIG. 4 is a diagram illustrating a configuration example of the exhaust gas treatment apparatus according to the second embodiment of the present invention. As shown in FIG. 4, the exhaust gas treatment device 21 according to the second embodiment includes a sub flue 24 instead of the sub flue 4 of the flue 2 of the exhaust gas treatment device 1 according to the first embodiment described above. . Further, the exhaust gas treatment device 21 does not include the wind direction adjusting unit 11, the wind direction regulating plate 12, the dust meter 13, and the control unit 14 in the first embodiment. Other configurations are the same as those of the first embodiment, and the same reference numerals are given to the same components.

  In the second embodiment, the exit side of the flue 2 branches into a main flue 3 and a sub flue 24 as shown in FIG. The exit side open end 3 a of the main chimney 3 is connected to a predetermined part of the side wall of the chimney 15, for example, a part lower than the center part in the height direction of the chimney 15.

  The auxiliary flue 24 forms a temporary route R2 that guides the exhaust gas G1 from the coke oven 16 to the low part in the chimney 15 without passing through the dust collector 9. The low part in the chimney 15 is a part that is lower than the outlet side open end 3a of the main flue 3 connected to the chimney 15, and is, for example, a chimney lower part 15a as shown in FIG. Moreover, the opening dimension of the sub flue 24 is substantially constant from the branch part with the main flue 3 to the exit side part 24b of the sub flue 24, and changes in this exit side part 24b. The inner wall of the outlet portion 24b is formed in a shape such as a taper shape or a step shape so that the opening size becomes smaller continuously or stepwise toward the outlet side opening end portion 24a of the sub flue 24. That is, the exit side opening dimension of the sub flue 24 decreases continuously or stepwise toward the chimney 15 side. Such a secondary flue 24 appropriately guides the exhaust gas G1 from the coke oven 16 into the chimney 15 along the temporary route R2, but distributes the exhaust gas G1 as compared with the auxiliary flue 4 in the first embodiment described above. It becomes difficult to do.

  In addition, if the connection part of the chimney 15 and the sub flue 24 is arrange | positioned in the site | part where the exit side opening end part 24a of the sub flue 24 is lower than the exit side opening end part 3a of the main flue 3 The desired part of the side wall of the chimney 15 may be used. However, from the viewpoint of making it easier to increase the pressure in the chimney 15 than in the auxiliary flue 24, it is desirable that the connecting portion between the chimney 15 and the auxiliary flue 24 is a lower part. For example, the connection portion between the chimney 15 and the sub flue 24 is desirably near the bottom of the chimney 15, that is, as shown in FIG. Furthermore, it is desirable that the outlet side opening end portion 24 a of the sub flue 24 is disposed below the side wall portion of the chimney 15 facing the outlet side opening end portion 3 a of the main flue 3.

  Here, the exhaust gas treatment device 21 does not include a configuration for adjusting the wind direction of the exhaust gas G2 flowing into the chimney 15 from the main flue 3, but as described above, the exit side opening dimension toward the chimney 15 side. A secondary flue 24 is provided. The sub flue 24 is less likely to circulate the exhaust gas G1 than the sub flue 4 in the first embodiment due to the narrowing of the outlet opening dimension as described above. As a result, the exhaust gas pressure P6 at the position S6 in the outlet side portion 24b of the auxiliary flue 24 is strongly affected by the dust collection path R1, and is lower than that in the first embodiment. . Therefore, even if the exhaust gas pressure P2 at the position S2 in the chimney 15 shown in FIG. 4 does not adjust the inflow direction (wind direction) of the exhaust gas G2 from the main flue 3 into the chimney 15, the sub flue 24 It becomes higher than the exhaust gas pressure P6 inside. That is, the exhaust gas treatment device 21 has the exhaust gas pressure P1 at the positions S1 to S6 in the flue 2 including the main flue 3 and the sub flue 24 and in the chimney 15 as in the case of the first embodiment. -P6 pressure balance (see equations (1)-(3)) is maintained.

  It should be noted that the pressure balance of the exhaust gas pressures P1 to P6 in the second embodiment is such that the opening degree of the pressure regulating valve 6 and the gas flow rate regulating valve 7, the suction action and blowing action of the suction blower 10, and the sub flue 24 Realized and maintained by the exit opening dimensions. In particular, the exhaust gas pressure P <b> 2 at the position S <b> 2 in the chimney 15 is the pressure on the chimney 15 side at the boundary portion between the chimney 15 and the sub flue 24. The exhaust gas pressure P6 at position S6 in the auxiliary flue 24 is the pressure on the auxiliary flue 24 side at this boundary portion. Such a pressure balance (P2> P6) between the exhaust gas pressure P2 and the exhaust gas pressure P6 is realized and maintained by the suction action and the air blowing action of the suction fan 10 and the outlet side opening size of the sub flue 24.

  Next, an exhaust gas treatment method according to the second embodiment of the present invention will be described. In the exhaust gas treatment method according to the second embodiment, the direction of the exhaust gas G2 flowing into the chimney 15 from the main flue 3 is not adjusted, and the outlet side opening size of the sub flue 24 that forms the temporary route R2 is defined as the chimney. The second embodiment is the same as the first embodiment except that it is reduced toward the 15 side to suppress the inflow of exhaust gas from the sub flue 24 into the chimney 15 except for these two points.

  That is, in the exhaust gas treatment device 21 shown in FIG. 4, the flue valve 5 of the auxiliary flue 24 is maintained in a fully opened state during the dust collection operation period during which the exhaust gas G1 from the coke oven 16 is to be collected and discharged. The temporary route R2 is always opened and the dust collection route R1 is opened. Next, the suction blower 10 sucks the exhaust gas G1 into the dust collector 9 along the dust collection path R1, and sends the exhaust gas G2 after the dust collection processing by the dust collector 9 into the chimney 15 along the dust collection path R1. As a result, the pressure on the exit side of the temporary route R2 in the chimney 15 is made higher than the pressure of the temporary route R2. That is, the exhaust gas pressure P2 at the position S2 in the chimney 15 shown in FIG. 4 is made higher than the exhaust gas pressure P6 at the position S6 in the sub flue 24. Further, the respective opening degrees of the pressure regulating valve 6 and the gas flow rate regulating valve 7 are appropriately adjusted, the respective opening degrees of the pressure regulating valve 6 and the gas flow rate regulating valve 7 after the adjustment, the suction action and the blowing action of the suction blower 10. And the outlet opening size of the auxiliary flue 24, the pressure balance expressed by the above-described formulas (1) to (3) is within the flue 2, the main flue 3, the auxiliary flue 24, and the chimney. Implemented and maintained within 15.

  In such a dust collection operation period, the exhaust gas G2 continuously flowing from the main flue 3 into the chimney 15 is discharged from the sub flue 24 into the chimney 15 as in the first embodiment. While preventing the inflow, it flows above the chimney 15 and is finally discharged from the chimney 15 into the atmosphere. On the other hand, the exhaust gas G1 in the sub flue 24 is prevented from flowing into the chimney 15 side by the exhaust gas G2 in the chimney 15 in this way, and stays with the outlet side open end 24a of the sub flue 24 at the head. A part of the exhaust gas G1 staying in the sub flue 24 flows into the main flue 3 by the suction action of the suction blower 10 together with the exhaust gas G1 that sequentially flows into the flue 2 from the coke oven 16. After that, it is the same as in the first embodiment, and in the dust collection operation period, the same circulation cycle of the exhaust gases G1, G2 as in the first embodiment is continuously repeated.

  Further, as in the first embodiment, the exhaust gas treatment device 21 immediately moves the exhaust gas distribution path from the coke oven 16 into the chimney 15 after the dust collection operation period is shifted to the dust collection stop period. The route is changed from the dust collection route R1 that passes through to a temporary route R2 that does not pass through the dust collector 9. In this case, the auxiliary flue 24 flows the exhaust gas G1 from the coke oven 16 into the chimney 15 immediately after the suction blower 10 is stopped. The exhaust gas G1 smoothly flows from the coke oven 16 through the auxiliary flue 24 into the chimney 15 and is discharged from the chimney 15 into the atmosphere. As a result, the situation where the exhaust gas G1 from the coke oven 16 is excessively stagnated in the flue 2 within the dust collection stop period is prevented, and the occurrence of abnormal combustion of the exhaust gas G1 in the flue 2 is avoided.

  After that, when the power source is restored, the exhaust gas treatment device 21 operates the dust collector 9 and the suction blower 10 again to collect the exhaust gas G1 from the coke oven 16 and discharge it as described above. Resume. That is, immediately after the power source is restored, the exhaust gas treatment device 21 changes the exhaust gas flow path from the coke oven 16 into the chimney 15 from the temporary path R2 that does not pass through the dust collector 9 to the dust collection path R1 that passes through the dust collector 9. To do.

  As described above, in the second embodiment of the present invention, the airflow direction adjustment of the exhaust gas flowing from the main flue into the chimney is not performed, and the outlet side opening size of the sub flue is reduced toward the chimney side. The exhaust gas pressure at the outlet side in the sub flue is reduced by making it difficult for the exhaust gas to flow into the chimney from the sub flue, and the others are configured in the same manner as in the first embodiment. For this reason, while enjoying the effect similar to embodiment mentioned above, the electric power required for the wind direction adjustment of the exhaust gas which flows into the chimney from the main flue can be omitted, and the exhaust gas in the flue can be obtained by a simple device configuration. Black smoke emission into the atmosphere can be safely suppressed without causing abnormal combustion.

  In the second embodiment described above, the exit side opening size of the sub flue 24 is made smaller toward the chimney 15 side to make it difficult to distribute the exhaust gas G1 from the sub flue 24 into the chimney 15. Not limited to this, the exhaust gas G1 may be made difficult to flow from the sub flue 24 into the chimney 15 by adjusting the opening degree of the sub flue 24 by the flue valve 5. In this case, the flue valve 5 only needs to partially close the opening in the sub flue 24 (that is, the opening of the temporary route R2) within an opening adjustment range in which the sub flue 24 is not fully closed. Thus, if the opening degree of the sub flue 24 is adjusted by the flue valve 5, the exit side opening dimension of the sub flue 24 may not be reduced toward the chimney 15 side. The above may be applied to the first embodiment. That is, in the exhaust gas treatment apparatus 1 according to the first embodiment, the flue valve 5 partially closes the opening in the sub flue 4 within the opening adjustment range in which the sub flue 4 is not fully closed. You may make it difficult to distribute | circulate waste gas G1 from the sub flue 4 into the chimney 15. FIG.

  Moreover, in Embodiment 1 mentioned above, the wind direction adjustment part 11 changes the inclination of the wind direction control board 12 according to the amount of soot measured by the soot meter 13, and, by this, from the main flue 3 in the chimney 15 Although the wind direction of the exhaust gas G2 was adjusted, the present invention is not limited to this, and the wind direction adjusting unit 11 fixes the main direction smoke by fixing the wind direction regulating plate 12 in a predetermined direction (for example, the direction toward the chimney lower part 15a). The wind direction of the exhaust gas G2 from the road 3 may always be adjusted downward. In this case, the exhaust gas treatment apparatus 1 may not include the dust meter 13 and the control unit 14 for controlling the wind direction adjusting unit 11.

  Further, in Embodiments 1 and 2 described above, the exhaust gas treatment device and the exhaust gas treatment method for collecting and discharging the exhaust gas from the coke oven are exemplified, but not limited thereto, the exhaust gas treatment device according to the present invention and The exhaust gas treatment method may be applied to furnace equipment other than the coke oven, for example, furnace equipment that needs to remove dust particles such as black smoke from the exhaust gas by dust collection. That is, the type and application of the furnace equipment to which the exhaust gas treatment apparatus and the exhaust gas treatment method according to the present invention are applied are not particularly limited.

  Further, the present invention is not limited by the above-described embodiment, and the present invention includes a configuration in which the above-described constituent elements are appropriately combined. For example, in the exhaust gas treatment apparatus 1 according to the first embodiment, the exit side opening size of the sub flue 4 may be reduced toward the chimney 15 side as in the second embodiment, or the wind direction adjusting unit 11 and the wind direction may be reduced. The restriction plate 12, the dust meter 13, and the control unit 14 may not be provided. In addition, all other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above-described embodiments are included in the present invention.

1,21 Exhaust gas treatment device 2 Flue 3 Main flue 3a, 4a, 24a Outlet side open end 4,24 Sub flue 5 Flue valve 6 Pressure regulating valve 7 Gas flow regulating valve 8 Shut-off valve 9 Dust collector 10 Suction blower DESCRIPTION OF SYMBOLS 11 Wind direction adjustment part 12 Wind direction control board 13 Dust meter 14 Control part 15 Chimney 16 Coke oven 24b Outlet part G1, G2 Exhaust gas R1 Dust collection path R2 Temporary path S1-S6 Position

Claims (12)

In the exhaust gas treatment equipment that collects exhaust gas from the furnace equipment with a dust collector and discharges it from the chimney,
A main flue that guides the exhaust gas from the furnace equipment to a predetermined part in the chimney via the dust collector, and a part that is lower than the predetermined part in the chimney without passing through the dust collector from the furnace equipment A flue branching to a secondary flue leading to the exhaust gas to communicate the furnace facility and the chimney;
A flue valve that always opens the secondary flue during the period in which the exhaust gas is to be discharged;
The exhaust gas is sucked into the dust collector along the main flue, and the exhaust gas after the dust collection processing by the dust collector is sent into the chimney along the main flue, the chimney and the sub flue A suction blower for increasing the pressure on the chimney side at the boundary portion of the boundary portion relative to the pressure on the auxiliary flue side;
An exhaust gas treatment apparatus comprising:   The exhaust gas treatment device according to claim 1, wherein an outlet side opening end portion of the auxiliary flue is connected to a lower portion of the chimney.   The exhaust gas treatment apparatus according to claim 1, further comprising a wind direction adjusting unit that adjusts a wind direction of the exhaust gas after the dust collection process that flows into the chimney from the main flue. A dust meter for measuring the amount of dust in the exhaust gas after the dust collection process discharged from the chimney;
With the increase in the amount of dust measured by the dust meter, a control unit that controls the wind direction adjusting unit so as to change the wind direction of the exhaust gas after the dust collection treatment to the lower side;
The exhaust gas treatment apparatus according to claim 3, further comprising:   The exhaust gas treatment apparatus according to any one of claims 1 to 4, wherein an exit side opening size of the sub flue decreases toward the chimney side.   The exhaust gas treatment apparatus according to any one of claims 1 to 4, wherein the flue valve partially closes an opening in the auxiliary flue. In the exhaust gas treatment method in which exhaust gas from the furnace equipment is collected by a dust collector and discharged from the chimney,
A dust collecting path that leads the exhaust gas from the furnace facility to a predetermined part in the chimney via the dust collector by a flue that communicates the furnace facility and the chimney, and from the furnace facility without passing the dust collector And a temporary path for guiding the exhaust gas to a lower part than the predetermined part in the chimney,
During the period when the exhaust gas should be discharged, the temporary path is always opened, the exhaust gas is sucked into the dust collector along the dust collection path, and the exhaust gas after the dust collection treatment by the dust collector is along the dust collection path. The exhaust gas treatment method is characterized in that the pressure on the exit side of the temporary path in the chimney is made higher than the pressure of the temporary path.   The exhaust gas treatment method according to claim 7, wherein an outlet side end of the temporary path is connected to a lower part of the chimney.   The pressure direction of the exhaust gas after the dust collection process flowing into the chimney from the dust collection path is adjusted to support an increase in pressure on the outlet side of the temporary path in the chimney. The exhaust gas treatment method according to claim 8.   Measuring the amount of soot in the exhaust gas after the dust collection process discharged from the chimney, and changing the wind direction of the exhaust gas after the dust collection process downward as the measured soot amount increases The exhaust gas treatment method according to claim 9.   The exhaust gas treatment method according to any one of claims 7 to 10, wherein an exit side opening size of a flue that forms the temporary path is reduced toward the chimney side.   The exhaust gas treatment method according to any one of claims 7 to 10, wherein an opening of the temporary path is partially closed.

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