JP2010229340A - Coke dry quenching facility and operation method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coke dry quenching facility that inhibits uneven temperature distribution of an inert gas supplied to a boiler. <P>SOLUTION: The coke dry quenching facility includes a cooling tower 4 for cooling red-hot coke charged to a pre-chamber with an inert gas introduced from the bottom part of a cooling chamber, a primary dust remover 9 for removing coarse grain coke contained in the discharged high temperature insert gas, a boiler 10 for recovering the sensible heat of the high temperature inert gas, a first circulating duct 8 which connects the cooling tower, the primary dust remover and the boiler, a secondary dust remover 12 for removing fine powder contained in the inert gas, a circulating blower 13 for sending the inert gas, a second circulating duct 11 which connects the bottom part of the cooling chamber and the circulating blower, a branching duct 14 branched from the second circulating duct for introducing part of the inert gas sent from the circulating blower to at least one of a gas flue and the first circulating duct, and a supply mechanism 15 for supplying fuel into the branching duct. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a coke dry fire extinguishing system that supplies high-temperature inert gas used for cooling red hot coke to a boiler for heat recovery and cools red hot coke again using the inert gas heat-exchanged in the boiler. And this method of operation.

  In the coke dry fire extinguishing equipment, red hot coke discharged from the coke oven is cooled by an inert gas, steam is generated by a boiler, and heat is recovered. And electric power generation can be performed using the heat-recovered energy.

  Here, if the amount of steam recovered by the boiler decreases, the power generation amount also decreases. Therefore, in the operation method of the coke dry fire extinguishing equipment described in Patent Document 1, in order to suppress the decrease in the amount of steam recovered by the boiler, the inside of the annular flue formed at the outlet of the cooling tower The fuel (or the fuel mixed with air) is blown into the tank. And by burning a fuel, the temperature of an inert gas is raised and the quantity of the vapor | steam collect | recovered with a boiler is made to increase.

Japanese Patent Laid-Open No. 9-241648 (paragraph 0014, FIG. 1) JP-A-4-76095 JP 2001-200247 A

  In the operation method described in Patent Document 1, the fuel is blown into the flue by ejecting the fuel from the nozzle. However, in such a configuration, the fuel may not diffuse efficiently in the flue. In this case, the fuel combustion efficiency varies, and the temperature distribution of the inert gas varies.

  In addition, since a complete combustion reaction does not occur between the cooling tower and the boiler and combustion occurs in the boiler, there is also a problem that the operation of the boiler is not performed stably. In particular, when a light specific gravity fuel such as coke oven gas is blown into an annular flue, the above phenomenon is remarkable and the efficiency during low blowing operation is deteriorated. In addition, when fuel and air are mixed and blown in advance, there is a problem of causing backfire when the flow rate is low or when the blowing is stopped, and the operating range is limited.

  Therefore, an object of the present invention is to provide a coke dry fire extinguishing facility capable of efficiently burning fuel and suppressing variations in the temperature distribution of the inert gas, and an operation method thereof.

  In the first invention of the present application, heat exchange is performed in the cooling chamber, in which the red hot coke put into the pre-chamber is heat-exchanged with the inert gas introduced from the lower part of the cooling chamber and the red hot coke is cooled. A primary dust remover for removing coarse coke contained in a high temperature inert gas discharged from the annular flue of the pre-chamber, and a high temperature inert gas after coarse coke is removed by the primary dust remover A boiler that collects sensible heat, a cooling tower, a primary circulation duct that connects the primary dust remover and the boiler, and a fine powder contained in the inert gas after the sensible heat is collected by the boiler 2 A secondary duster, a circulation blower for sending the inert gas after fine powder is removed by the secondary dust remover toward the lower part of the cooling chamber, and a second part connecting the lower part of the cooling chamber and the circulation blower. A branch duct that is branched from the second circulation duct and guides a part of the inert gas from the circulation blower to at least one of the flue and the first circulation duct. And a coke dry fire extinguishing system, characterized by comprising a supply mechanism for supplying fuel into the branch duct.

  A temperature sensor for detecting the temperature of the inert gas taken into the boiler, and a controller for controlling the amount of fuel supplied by the supply mechanism based on the temperature detected by the temperature sensor can be provided. The controller increases the fuel supply amount when the detected temperature is lower than the lower limit value of the reference temperature range, and increases the fuel supply amount when the detected temperature is higher than the upper limit value of the reference temperature range. Can be reduced.

  The second invention of the present application is a heat exchange in the cooling chamber in which the red hot coke put into the pre-chamber is heat exchanged with an inert gas introduced from the lower part of the cooling chamber to perform a cooling process of the red hot coke, A primary dust remover for removing coarse coke contained in a high temperature inert gas discharged from the annular flue of the pre-chamber, and a high temperature inert gas after coarse coke is removed by the primary dust remover A boiler that collects sensible heat, a cooling tower, a primary circulation duct that connects the primary dust remover and the boiler, and a fine powder contained in the inert gas after the sensible heat is collected by the boiler 2 A secondary duster, a circulation blower for sending the inert gas after fine powder is removed by the secondary dust remover toward the lower part of the cooling chamber, and a second part connecting the lower part of the cooling chamber and the circulation blower. In the method of operating a coke dry fire extinguishing system having a circulation duct, a part of the inert gas from the circulation blower is removed from the flue and the first circulation duct by a branch duct disposed in the second circulation duct. A method for operating a coke dry fire extinguishing system, characterized in that the coke dry fire extinguishing equipment is characterized in that the fuel is supplied into at least one of them and supplied into a branch duct.

  Here, a detection step for detecting the temperature of the inert gas taken into the boiler, and a control logic for controlling the amount of mixed fuel based on the detection temperature obtained in the detection step, the detection temperature is set to the reference temperature. When the temperature is lower than the lower limit of the range, the fuel mixing amount can be increased, and when the detected temperature is higher than the upper limit value of the reference temperature range, the fuel mixing amount can be decreased.

  In the first and second inventions of the present application, a part of the inert gas from the second circulation duct is supplied together with the fuel. Thus, by supplying the inert gas containing fuel to the annular flue or the first circulation duct, the fuel can be easily diffused in the annular flue or the first circulation duct. Fuel combustion efficiency can be improved. And while being able to suppress the variation in the temperature of the inert gas led to a boiler, since it does not cause the combustion of the fuel in a boiler, the stable operation of a boiler can be performed. Further, since a low amount of fuel can be injected, application in all operating ranges is possible.

It is the schematic which shows the structure of the coke dry fire extinguishing equipment which is Example 1 of this invention. It is the schematic which shows the structure of the coke dry fire extinguishing equipment which is Example 2 of this invention. It is the schematic which shows the structure of the coke dry fire extinguishing equipment which is Example 3 of this invention. In Example 3, it is a flowchart which shows control of the supply amount of fuel and combustion air. It is a figure which shows transition of the steam generation amount in a boiler.

  Examples of the present invention will be described below.

  The configuration of a coke dry fire extinguishing system that is Embodiment 1 of the present invention will be described with reference to FIG.

  Red hot coke pushed out from a kiln (carbonization chamber) of a coke oven (not shown) is carried by a bucket to an inlet 2 provided at the top of the cooling tower 1 and charged into the pre-chamber 3 by a charging device. The A cooling chamber (cooling chamber) 4 is located below the pre-chamber 3, and an inert gas (for example, nitrogen gas) is supplied into the cooling chamber 4 from the supply unit 4a. As will be described later, this inert gas is circulated and used in a coke dry fire extinguishing facility. In FIG. 1, hatched arrows indicate the moving direction of the inert gas.

  In the process of moving from the pre-chamber 3 to the cooling chamber 4, the red hot coke charged from the charging port 2 is extinguished and cooled by coming into contact with an inert gas. The cooled coke is discharged to the outside of the cooling tower 1 from the discharge device 5 disposed at the lower part of the cooling chamber 4. The coke discharged from the discharge device 5 is transported by a transport device (not shown).

  When the inert gas is brought into contact with the red hot coke in the cooling chamber 4, the inert gas becomes a high temperature state by heat exchange between the inert gas and the red hot coke. The hot inert gas moves from the cooling chamber 4 to the flue 7 via the sloping flue 6. The flue 7 is disposed along the outer periphery of the pre-chamber 3 and is formed in an annular shape. Since a part of the flue 7 is connected to the first circulation duct 8, the hot inert gas that has passed through the flue 7 moves along the first circulation duct 8.

  The first circulation duct 8 is provided with a primary dust remover 9, in which dust or the like contained in the inert gas moving in the first circulation duct 8 is collected. The

  The high-temperature inert gas that has passed through the primary dust remover 9 is supplied to the boiler 10 so that heat recovery is performed.

  The inert gas (low temperature inert gas) heat-exchanged in the boiler 10 moves along the second circulation duct 11 and is guided to the cooling chamber 4 of the cooling tower 1. It is used again for cooling the red hot coke in the chamber 4. As described above, the first and second circulation ducts 8 and 11 cause the inert gas to circulate between the cooling tower 1 and the boiler 10 in a one-way path.

  In the second circulation duct 11, a secondary dust remover 12 is provided, and in the secondary dust remover 12, dust contained in the inert gas moving in the second circulation duct 11 is collected. The inert gas subjected to the dust removal process by the secondary dust remover 12 moves through the second circulation duct 11 and is guided to the circulation blower 13. Here, a damper 17 is disposed in a region located between the secondary dust remover 12 and the circulation blower 13 in the second circulation duct 11. The damper 17 is used to adjust the amount of inert gas that moves from the secondary dust remover 12 to the circulation blower 13.

  The circulation blower 13 serves as a power source for circulating the inert gas between the cooling tower 1 and the boiler 10. The inert gas sent out from the circulation blower 13 moves along the second circulation duct 11, is supplied to the cooling chamber 4, and is used for cooling the red hot coke.

  In the present embodiment, a branch duct 14 is connected to a region of the second circulation duct 11 located between the circulation blower 13 and the cooling tower 1 (cooling chamber 4). One end of the branch duct 14 is connected to the second circulation duct 11, and the other end of the branch duct 14 is connected to the flue 7. For this reason, the inert gas sent out from the circulation blower 13 is divided into the cooling chamber 4 and the flue 7. The flue 7 is connected to a duct for supplying air to a portion different from the connecting portion with the branch duct 14.

  The branch duct 14 is provided with a damper 16 for adjusting the amount (or flow velocity) of the inert gas moving through the branch duct 14. Further, the branch duct 14 is provided with a damper 15, and fuel is supplied into the branch duct 14 via the damper 15. This fuel is used to raise the temperature of the inert gas by burning with air supplied from the duct. The fuel may be any material that can burn and raise the temperature of the inert gas. For example, pulverized coke, pulverized coal, coke oven gas, blast furnace gas, propane gas, natural gas, heavy oil, coal tar are used. be able to.

  According to this embodiment, since the fuel is mixed with the inert gas supplied to the flue 7 via the branch duct 14, the flow rate becomes faster than the fuel alone supplied into the flue 7. 7, the fuel can be diffused efficiently. Then, by efficiently diffusing the fuel in the flue 7, the combustion efficiency of the fuel is improved, and the temperature distribution of the inert gas supplied from the flue 7 to the boiler 10 is prevented from being varied. can do.

  Further, by efficiently diffusing the fuel, the fuel can be completely burned in the path from the flue 7 to the boiler 10. In other words, the unburned fuel reaches the boiler 10 and can suppress the combustion of the fuel in the boiler 10, can stably generate the steam of the boiler 10, and the amount of fuel used Can also be reduced.

  Furthermore, since the inert gas of the branch duct 14 mixed with fuel is supplied to the flue 14, the gas flow rate supplied to the flue 7 always exceeds the flashback speed, so there is no risk of flashback. . Therefore, it can be applied in any operating range.

  Next, the configuration of a coke dry fire extinguishing system that is Embodiment 2 of the present invention will be described with reference to FIG. In the present embodiment, members having the same functions as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment, the branch duct 14 is connected to the flue 7, and the inert gas from the circulation blower 13 is supplied into the flue 7 in a state where fuel is included. On the other hand, in this embodiment, an inert gas from the circulation blower 13 is supplied into the first circulation duct 8 by using the same branch duct as in the first embodiment. Hereinafter, differences from the first embodiment will be mainly described.

  One end of the branch duct 14 is connected to the second circulation duct 11, and the other end of the branch duct 14 is connected to the first circulation duct 8. As a specific example, the other end of the branch duct 14 is connected to a region located between the flue 7 and the primary dust remover 9 in the first circulation duct 8. Thereby, the inert gas from the circulation blower 13 is divided into the cooling chamber 4 and the first circulation duct 8. Further, the first circulation duct 8 is connected to a duct for supplying air to a portion different from the connection portion with the branch duct 14.

  Also in this embodiment, fuel is supplied into the branch duct 14 via the damper 15 as in the first embodiment. As a result, the inert gas containing fuel is supplied into the first circulation duct 8 via the branch duct 14. The fuel that has moved into the first circulation duct 8 combusts with the air from the duct, thereby raising the temperature of the inert gas.

  Also in this embodiment, the same effect as that of Embodiment 1 can be obtained. That is, the fuel can be diffused efficiently in the first circulation duct 8, and variations in the temperature distribution of the inert gas can be suppressed. And since fuel can be burned completely before reaching the boiler 10, steam can be generated stably. Moreover, since there is no fear of flashback, it can be applied in any operating range.

  In the present embodiment, the branch duct 14 is connected to the area of the first circulation duct 8 on the side of the flue 7 with respect to the primary dust remover 9, but the present invention is not limited to this. That is, it is only necessary that an inert gas containing fuel is supplied into the first circulation duct 8 so that the fuel can be combusted in the path from the flue 7 to the boiler 10. For example, the branch duct 14 can be connected to a region of the first circulation duct 8 that is closer to the boiler 10 than the primary dust remover 9.

  Also, the configurations of the present embodiment and the first embodiment can be combined. As a specific example, the branch duct 14 can be branched into two, one connected to the flue 7 and the other connected to the first circulation duct 8. In this configuration, the inert gas that has moved from the circulation blower 13 into the branch duct 14 is guided to the flue 7 and the first circulation duct 8. Here, the fuel supply position can be set as appropriate. For example, the fuel is supplied at a portion where the branch duct 14 is branched into two, or the fuel is supplied at a portion upstream of the position where the branch duct 14 is branched into two in the moving direction of the inert gas. You can do it.

  Next, the structure of the coke dry fire extinguishing system which is Example 3 of the present invention will be described with reference to FIG. In the present embodiment, members having the same functions as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, the amount of fuel blown into the branch duct 14 and the amount of combustion air supplied into the flue 7 are controlled based on the temperature of the inert gas supplied to the boiler 10. is there. Hereinafter, this control will be specifically described.

  In the present embodiment, a temperature sensor 21 is disposed in a connection portion with the boiler 10 in the first circulation duct 8. The temperature sensor 21 is provided to detect the temperature of the inert gas at the inlet portion of the boiler 10. The controller 20 detects the temperature of the inert gas at the inlet portion of the boiler 10 based on the output from the temperature sensor 21.

  The position where the temperature sensor 21 is arranged can be set as appropriate. That is, it is only necessary that the temperature of the inert gas supplied to the boiler 10 can be detected.

  The controller 20 controls the operation of the dampers 18 and 19 by outputting control signals to the dampers 18 and 19. The damper 18 is used to adjust the amount of fuel supplied to the branch duct 14. The damper 19 is used to adjust the amount of combustion air supplied to the flue 7.

  Next, drive control of the dampers 18 and 19 will be described using the flowchart shown in FIG.

  In step S <b> 10, the controller 20 detects the temperature of the inert gas guided to the boiler 10 based on the output of the temperature sensor 21. In step S11, the controller 20 determines whether or not the temperature detected in step S10 is lower than the lower limit value of the reference temperature range. This reference temperature range is a temperature range set in advance for recovering a predetermined amount of heat in the boiler 10, and can be set to 900 to 1000 ° C., for example. In this case, 900 ° C. is the lower limit value of the reference temperature range, and 1000 ° C. is the upper limit value of the reference temperature range.

  In step S11, if the detected temperature is lower than the lower limit value, the process proceeds to step S12, and if not, the process proceeds to step S13.

  In step S <b> 12, the controller 20 outputs a control signal to each of the dampers 18 and 19 to increase the supply amount of fuel and combustion air. If the supply amount of fuel and combustion air is increased, the combustion of fuel in the flue 7 is promoted, and the temperature of the inert gas guided to the boiler 10 can be increased. In the process of step S12, the rate of increase in the supply amount of fuel and combustion air can be made equal to each other or can be made different from each other. Also, it is possible to increase only the fuel supply amount.

  Here, if the relationship between the temperature of the inert gas guided to the boiler 10 and the supply amount of fuel and combustion air is obtained in advance, the supply amount of fuel and combustion air is determined based on this relationship. be able to. For example, a map showing the relationship between the temperature of the inert gas and the supply amount of fuel or the like is stored in the memory, and the supply amount of fuel or the like is determined using the detected temperature of the inert gas and the map. be able to. Further, the supply amount of fuel or the like can be determined using an arithmetic expression that indicates the relationship between the temperature of the inert gas and the supply amount of fuel or the like.

  In step S13, the controller 20 determines whether or not the temperature detected in step S10 is higher than the upper limit value of the reference temperature range described above. If the detected temperature is higher than the upper limit value, the process proceeds to step S14. If not, the process ends.

  In step S <b> 14, the controller 20 outputs control signals to the dampers 18 and 19 to reduce the supply amount of fuel and combustion air. If the supply amount of fuel and combustion air is reduced, the combustion of fuel in the flue 7 is suppressed, and the temperature of the inert gas guided to the boiler 10 can be lowered. In the process of step S14, the rate of decrease in the supply amount of fuel and combustion air can be made equal to each other or can be made different from each other. Also, it is possible to reduce only the amount of fuel supplied.

  FIG. 5 shows the transition of the amount of steam generated in the boiler 10. In FIG. 5, the horizontal axis indicates the operation time of the boiler 10 (coke dry fire extinguishing equipment), and the vertical axis indicates the amount of steam generated in the boiler 10. Note that the amount of steam generated in the boiler 10 is proportional to the temperature of the inert gas supplied to the boiler 10.

  In FIG. 5, the solid line shows the transition of the steam generation amount when the supply amount of fuel and combustion air is controlled as described in the present embodiment. Moreover, the dotted line has shown transition of the steam generation amount in the conventional structure. The conventional configuration is a configuration in which the branch duct 14 is omitted in the configuration of the present embodiment shown in FIG. That is, the inert gas from the circulation blower 13 is guided only to the cooling chamber 4 of the cooling tower 1.

  As shown in FIG. 5, according to the present embodiment, it can be seen that the variation in the amount of steam generated in the boiler 10 is suppressed as compared with the conventional configuration.

  According to the present embodiment, since the supply amounts of fuel and combustion air are adjusted based on the temperature detected by the temperature sensor 21, it is possible to suppress variation in the temperature of the inert gas supplied to the boiler 10. Can do. Thereby, the thermal load in the boiler 10 can be made substantially constant, and the heat recovery amount by the boiler 10 can be made substantially constant.

  In the present embodiment, the supply amount of fuel and combustion air is controlled in the configuration described in the first embodiment (FIG. 1), but the present invention is not limited to this. Specifically, in the configuration described in the second embodiment (FIG. 2), the supply amount of fuel and combustion air can be controlled. In the present embodiment, the supply amount of fuel and the like is controlled so that the temperature of the inert gas in the vicinity of the inlet of the boiler 10 is within the reference temperature range. The supply amount of fuel or the like can also be controlled so as to be (value). In this case, if the detected temperature of the inert gas is higher than the reference value, the supply amount of fuel or the like is decreased, and if the detected temperature of the inert gas is lower than the reference value, the supply amount of fuel or the like is increased. be able to.

1: Cooling tower 2: Inlet 3: Pre-chamber 4: Cooling chamber (cooling chamber)
5: Discharge device 6: Slowing flue 7: Flue 8: First circulation duct 9: Primary dust remover 9a: Dust removal plate 10: Boiler 11: Second circulation duct 12: Secondary dust remover 13: Circulation blower 14 : Branch ducts 15 to 19: Damper 20: Controller 21: Temperature sensor

Claims (4)

A cooling tower for performing a heat treatment of the red hot coke by exchanging heat with the inert gas introduced from the lower part of the cooling chamber,
A primary dust remover that removes coarse coke contained in the high-temperature inert gas that is heat-exchanged in the cooling chamber and discharged from the annular flue of the pre-chamber;
A boiler that recovers sensible heat of the high-temperature inert gas after coarse-grained coke is removed by the primary dust remover;
A first circulation duct connecting the cooling tower, the primary dust remover and the boiler;
A secondary dust remover for removing fine powder contained in the inert gas after sensible heat has been recovered by the boiler;
A circulating blower for sending the inert gas after fine powder is removed by the secondary dust remover toward the lower part of the cooling chamber;
Coke dry fire extinguishing equipment having a lower part of the cooling chamber and a second circulation duct connecting the circulation blower,
A branch duct branched from the second circulation duct and guiding a part of the inert gas from the circulation blower to at least one of the annular flue and the first circulation duct;
A coke dry fire extinguishing system comprising a supply mechanism for supplying fuel into the branch duct. A temperature sensor for detecting the temperature of the inert gas taken into the boiler;
A controller for controlling the amount of fuel supplied by the supply mechanism based on the temperature detected by the temperature sensor;
The controller increases the supply amount of the fuel when the detected temperature is lower than the lower limit value of the reference temperature range, and increases the fuel supply when the detected temperature is higher than the upper limit value of the reference temperature range. The coke dry-type fire extinguishing equipment according to claim 1, further comprising a device that reduces a supply amount of the coke. A cooling tower for performing a heat treatment of the red hot coke by exchanging heat with the inert gas introduced from the lower part of the cooling chamber,
A primary dust remover that removes coarse coke contained in the high-temperature inert gas that is heat-exchanged in the cooling chamber and discharged from the annular flue of the pre-chamber;
A boiler that recovers sensible heat of the high-temperature inert gas after coarse-grained coke is removed by the primary dust remover;
A first circulation duct connecting the cooling tower, the primary dust remover and the boiler;
A secondary dust remover for removing fine powder contained in the inert gas after sensible heat has been recovered by the boiler;
A circulating blower for sending the inert gas after fine powder is removed by the secondary dust remover toward the lower part of the cooling chamber;
In a method for operating a coke dry fire extinguishing system, comprising a lower part of the cooling chamber and a second circulation duct connecting the circulation blower,
A branch duct disposed in the second circulation duct guides a part of the inert gas from the circulation blower to at least one of the annular flue and the first circulation duct, and the branch duct. A method for operating a coke dry fire extinguishing system, characterized by supplying fuel into the interior. A detection step of detecting the temperature of the inert gas taken into the boiler;
Control logic for controlling the supply amount of the fuel based on the detected temperature obtained in the detection step,
In the control logic, when the detected temperature is lower than the lower limit value of the reference temperature range, the fuel supply amount is increased, and when the detected temperature is higher than the upper limit value of the reference temperature range, The operation method of the coke dry-type fire extinguishing equipment according to claim 3, wherein the supply amount of fuel is reduced.

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