JP2012251698A - Waste heat recovery equipment of sintered ore cooling device, waste heat recovering method, and sintering machine system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide waste heat recovery equipment of a sintered ore cooling device capable of effectively utilizing heat of a discharged exhaust gas without increasing costs of equipment of the sintered ore cooling device and degrading cooling performance of the sintered ore cooling device.SOLUTION: This waste heat recovery equipment 4 of the sintered ore cooling device has an exhaust dust 43 to which an exhaust gas of high temperature generated from a front-half part of the sintered ore cooling device 3 is guided, a boiler 45 disposed in the exhaust duct 43 and recovering the waste heat of the exhaust gas as steam, and a fan 46 sucking the exhaust gas of high temperature generated from the front-half part of the sintered ore cooling device 3 to the exhaust duct 43, and the exhaust duct 43 supplies the exhaust gas after recovering the waste heat, to a part excluding at least the last wind box of a sintering machine 2.

Description

  The present invention relates to a waste heat recovery facility, a waste heat recovery method, and a sintering machine system of a sintered ore cooling device used in a sintering machine that manufactures sintered ore used as a blast furnace raw material.

  A sintering machine for producing sintered ore used as a blast furnace raw material is charged with a sintered raw material on a circulating pallet to form a sintered raw material layer, and the sintered raw material layer is formed in an ignition furnace provided in the preceding stage. The carbon material inside is ignited, the carbon material is burned while sucking air, and the sintering raw material is sintered by the combustion heat at that time. The obtained sintered ore is pulverized by a crusher and then charged on a pallet moving and circulating in the sinter ore cooling device, and cooled by being blown with air.

  By the way, since the initial sintered ore charged in the cooling device has a high temperature of 600 to 700 ° C. and has a great deal of energy, the waste heat is recovered. For example, after removing the high-temperature exhaust gas discharged from the first half of the cooling device with a simple dust remover so that it does not affect the subsequent equipment, heat is recovered with a boiler, After removing dust to a dust concentration that can be released to the atmosphere, after simple dust removal using a simple dust remover (for example, Non-Patent Document 1) or high-temperature exhaust gas discharged from the first half of the cooling device There is known a technique (for example, Patent Document 1) in which heat recovery is performed by a boiler, and exhaust gas whose temperature is reduced by heat recovery is circulated and reused as a cooling gas for the first half of the cooling device.

JP-A-53-18041

3rd Edition Iron and Steel Handbook Volume II Steelmaking and Steelmaking (issued in 1980) p. 94-104

  In the technique of Non-Patent Document 1, in order to set the dust concentration in the exhaust gas after heat recovery by the boiler below the emission standard, the dust collector installed at the rear stage of the boiler is a multi-cyclone, an electric dust collector, a bug It is necessary to use a high-performance filter or the like, and there is a problem that the equipment cost becomes high. In addition, from the viewpoint of the efficiency of heat recovery by the boiler, the exhaust gas temperature after heat recovery must be 150 ° C or higher, and this exhaust gas of 150 ° C or higher will be released to the atmosphere, so the effective use of waste heat From this point of view, it is still insufficient.

  Moreover, in the technique of the above-mentioned Patent Document 1, it is not necessary to add a high-performance dust collector. However, as described above, the temperature of the exhaust gas after heat recovery by the boiler is 150 ° C. or higher. Cooling of the high-temperature sintered ore is performed with an exhaust gas of 150 ° C. or higher, which may reduce the cooling performance. Therefore, if the cooling capacity of the second half of the cooling device is not sufficient, it is necessary to increase the cooling capacity, and if the cooling gas supply part of the first half cannot withstand high-temperature gas, Must be able to withstand high temperatures, and the equipment becomes expensive.

  The present invention has been made in view of such a situation, without adding a high-performance dust collector, without making the equipment of the sinter cooler expensive, and cooling the sinter cooler. Waste heat recovery equipment and waste heat recovery method for a sintered ore cooling device capable of effectively utilizing the heat of exhaust gas discharged without reducing the capacity, and a sintering machine equipped with such waste heat recovery equipment The purpose is to provide a system.

  In order to solve the above-described problem, in the first aspect of the present invention, after a sintered raw material is charged on an endless moving pallet, and the sintered raw material is ignited, a plurality of the pallets are moved along the pallet A sintering machine that produces sintered ore by burning the carbonaceous material in the sintered raw material by supplying air to the sintered raw material through the arranged air box, and sintering with the combustion heat, and an endless mobile type A sinter cooler for charging sintered sinter by charging the sintered ore while moving the pallet while charging the sintered ore which has been sintered and pulverized on the pallet. A waste heat recovery facility for a sintered ore cooling device that recovers waste heat from the high-temperature exhaust gas in the first half of the sintered ore cooling device, the first half of the sintered ore cooling device An exhaust duct through which high-temperature exhaust gas generated from the part is guided, and the exhaust duct A boiler that recovers waste heat of exhaust gas as steam, and a fan that guides high-temperature exhaust gas generated from the first half of the sinter cooling device to the exhaust duct, the exhaust duct after waste heat recovery The waste heat recovery equipment of the sinter cooling device is provided, wherein the exhaust gas is supplied to a portion of the sintering machine excluding at least the final wind box.

  In the equipment according to the first aspect, the sinter has a hood provided at a portion excluding at least the final wind box, and the exhaust duct is connected to the hood. . Moreover, the said hood can be provided in the latter half part of the said sintering machine, and it is preferable that the said hood can move along the advancing direction of the said pallet in that case. The hood may be provided in the first half of the sintering machine.

  In the second aspect of the present invention, a sintered raw material is charged on an endless moving pallet, and after igniting the sintered raw material, a plurality of wind boxes arranged along the pallet are moved through the pallet. By supplying air to the sintering material, the carbonaceous material in the sintering material is burned and sintered with the combustion heat to produce sintered ore, and the sintering machine on an endless moving pallet A sintering machine system comprising: a sintered ore cooling device for charging a sintered ore while cooling the sintered ore by charging the sintered ore while moving the pallet while charging the sintered ore sintered and pulverized A waste heat recovery method for a sinter cooler that recovers waste heat from the high temperature exhaust gas in the first half of the sinter cooler, the hot exhaust gas generated from the first half of the sinter cooler To the exhaust duct and the exhaust led by the boiler installed in the exhaust duct. Waste heat of a sinter ore cooling device, wherein waste heat of the sinter is recovered as steam, and exhaust gas after the waste heat is recovered is supplied to at least a portion of the sintering machine excluding the final wind box Provide recovery methods.

  In the method according to the second aspect, the exhaust gas after the waste heat has been recovered can be supplied to the latter half of the sintering machine. In this case, it is preferable that the supply range of the exhaust gas is variable. Moreover, the exhaust gas after the waste heat is recovered can be supplied to the first half of the sintering machine.

  In the third aspect of the present invention, after the sintered raw material is charged on an endless movable pallet, and the sintered raw material is ignited, a plurality of wind boxes arranged along the pallet are moved while moving the pallet. By supplying air to the sintering material, the carbonaceous material in the sintering material is burned and sintered with the combustion heat to produce sintered ore, and the sintering machine on an endless moving pallet A sintered ore cooling device for charging the sintered ore by cooling the sintered ore while charging the sintered ore while charging the sintered ore while moving the pallet And a waste heat recovery facility of a sinter ore cooling device that recovers waste heat from the high-temperature exhaust gas in the first half of the sinter, wherein the waste heat recovery facility is a first half of the sinter ore cooling device. An exhaust duct through which high-temperature exhaust gas generated from the portion is guided, and provided in the exhaust duct, A boiler that recovers waste heat of gas as steam; and a fan that sucks high-temperature exhaust gas generated from the first half of the sinter cooling device into the exhaust duct, the exhaust duct being exhaust gas after waste heat recovery Is supplied to a portion of the sintering machine excluding at least the final wind box, and the sintering machine system recovers waste heat from the exhaust gas in the latter half of the sintering machine by a boiler. A sintering machine system characterized by further comprising:

  The system according to the third aspect further includes a sintering machine waste heat recovery facility for recovering waste heat from the exhaust gas in the latter half of the sintering machine by means of a boiler, and the exhaust gas after recovering waste heat The main exhaust gas duct of the machine can be supplied.

  In the third aspect, the sintering machine waste heat recovery facility may supply the exhaust gas after recovering the waste heat as a combustion gas to the first half of the sintering machine. You may make it supply to the first half part of a machine. Moreover, it is preferable that the feed water temperature to the boiler of the waste heat recovery facility of the sintering machine is equal to or higher than the acid dew point of the exhaust gas of the sintering machine. In this case, it is preferable that the boiler of the waste heat recovery facility for the sintering machine has an evaporator, and the economizer and the superheater are not installed. Moreover, it is preferable that the boiler of the sintering machine waste heat recovery facility and the boiler of the waste heat recovery facility have a common steam drum and a common circulation pump.

  According to the present invention, waste heat of the exhaust gas in the first half of the sintered ore cooling device is recovered as steam by the boiler, and then the exhaust gas is supplied to at least the final wind box of the sintering machine. The exhaust gas supplied to the sintering machine can be effectively used to increase the temperature of the exhaust gas from the sintering machine or to impart sensible heat to the combustion air of the carbonaceous material in the sintering raw material. This makes it possible to suppress a decrease in the cooling capacity of the sinter cooling device without making the equipment expensive. Further, since the exhaust gas after waste heat recovery is collected by the dust collector of the sintering machine, it is not necessary to add an expensive dust collector to the waste heat recovery facility itself.

It is a schematic block diagram which shows the sintering machine system which concerns on the 1st Embodiment of this invention. It is a schematic diagram for demonstrating the structure of the boiler of the waste heat recovery equipment used for the sintering machine system of FIG. Regarding the image of the temperature pattern of the wind box in the sintering machine, when exhaust gas after waste heat recovery is not supplied (A), exhaust gas after waste heat recovery is supplied to the range including the final wind box in the second half of the sintering machine It is a figure which compares and shows the case (C) which supplies the waste gas after waste-heat collection | recovery in the range which excludes the last wind box of the latter half part of a sintering machine, when doing (B). It is a figure which shows the example which enabled the movement of the hood of the waste heat recovery equipment of a sinter cooling device to the advancing direction of a pallet. It is a schematic diagram for demonstrating the structure of the boiler of a sintering machine waste heat recovery equipment. It is a schematic block diagram for demonstrating the other system which adjusts the range of the wind box which collect | recovers the waste heat of a sintering machine in a sintering machine waste heat recovery equipment. It is a schematic block diagram which shows the example which manages the exhaust gas temperature of a boiler exit, without adjusting the range of the wind box which collect | recovers the waste heat of the sintering machine in a sintering machine waste heat recovery equipment. It is a schematic block diagram which shows the example which connected the exhaust duct of the sintering machine waste heat recovery equipment to the hood provided in the first half part of the sintering machine. It is a schematic block diagram which shows the sintering machine system which concerns on the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, the first embodiment will be described. FIG. 1 is a schematic configuration diagram showing a sintering machine system according to the first embodiment of the present invention.

  The sintering machine system 1 includes a sintering machine 2 that sinters sintering raw materials, a sintered ore cooling device 3 that cools the sintered ore produced by the sintering machine 2, and the first half of the sintering ore cooling device 3. It has a waste heat recovery facility 4 for recovering the heat of the exhaust gas discharged from the part, and a sintering machine waste heat recovery facility 5 for recovering the heat of the exhaust gas in the subsequent stage of the sintering machine 2.

The sintering machine 2 is of a lower suction type endless moving type and has an endless moving type pallet 11 on which a sintering raw material is charged by a charging system (not shown). As a result, the sintered raw material layer 13 is formed. As a sintering raw material, pseudo particles obtained by mixing and granulating powder iron ore with a secondary raw material containing CaO, SiO ₂ or the like, a carbonaceous material, and the like are used.

  An ignition furnace 12 is provided above the movement path of the pallet 11, and when the sintering raw material (pseudoparticles) on the pallet 11 passes through the ignition furnace 12, ignition is started and the sintering of the raw material layer 13 is started. Is done.

  A plurality of wind boxes (wind boxes) 15 are arranged directly below the pallet 11 along the direction of travel of the pallet 11, and a duct 16 is connected to each wind box 15. Thereby, the air above the sintering raw material layer 13 is sucked through the sintering raw material layer 13 by the wind box 15 and the duct 16 and the carbonaceous material is combusted by the sucked air, and the combustion heat causes the sintering raw material to burn. Is sintered.

  The duct 16 is connected to a main exhaust gas duct 17 disposed horizontally. The main exhaust gas duct 17 is provided with a dust collector 18, an exhaust fan 19, and a chimney 20. Air containing dust sucked from above the sintered raw material layer 13 by the exhaust fan 19 is supplied to the wind box 15, the duct. 16, the exhaust gas is sucked into the main exhaust gas duct 17 and reaches the dust collector 18, and the exhaust gas from which dust is removed is discharged from the chimney 20.

  A crusher 21 is provided on the exit side of the pallet 11, and the crusher 21 pulverizes the sintered ore that has fallen from the pallet 11. Below the crusher 21, a screen 22 for cutting fine powder out of the pulverized sintered ore is provided, and the sintered ore remaining on the screen 22 is supplied to the sinter cooler 3.

  An exhaust gas duct 23 is connected to the crusher 21. The exhaust gas duct 23 is provided with a dust collector 24, an exhaust fan 25, and a chimney 26, and exhaust gas from the crusher 25 is sucked into the exhaust gas duct 23 by the exhaust fan 25 and reaches the dust collector 24. The exhaust gas from which is removed is discharged from the chimney 26.

  The sintered ore cooling device 3 has an endless movable pallet 31, and pulverized sintered ore 33 from the sintering machine 2 is charged on the pallet 11 by a chute 32. 33 layers are formed.

  A plurality of wind boxes (wind boxes) 35 are arranged immediately below the pallet 31 along the traveling direction of the pallet 31, and a wind duct 36 is connected to each of the wind boxes 35. A cooling fan 37 is connected to the air duct 36, and cooling air is sent from the cooling fan 37 to the sintered ore 33 on the pallet 31 through the air duct 36 and the wind box 35. It is designed to be cooled. And the conveyor (not shown) is provided in the exit side of the pallet 31, and the sintered ore cooled to about 100 degrees C or less is discharged | emitted from the pallet 31 to a conveyor, and is conveyed to a blast furnace.

  The waste heat recovery equipment 4 has a high temperature generated when air for cooling is supplied to the sintered ore 33 having a high temperature of 600 to 700 ° C. discharged from the sintering machine 2 in the sintered ore cooling device 3. It is for recovering waste heat from the exhaust gas, and is above the movement path of the pallet 11 of the sintering machine 2 and the hood 41 provided above the movement path of the pallet 31 in the first half of the sinter cooling device 3. Then, air is supplied from the cooling fan 37 to the hood 42 provided in a portion corresponding to at least the final one of the plurality of wind boxes 15 and the high-temperature sintered ore 33. The exhaust duct 43 that is generated by the exhaust gas and collected in the hood 41 and supplies the exhaust gas to the hood 42, the simple dust remover 44 provided in the exhaust duct 43, and the exhaust duct 4 Provided on the downstream side of the simple dust remover 44 and provided on the downstream side of the boiler 45 of the exhaust duct 43 and the boiler 45 for recovering the waste heat of the exhaust gas simply removed by the simple dust remover 44. And a fan 46 that leads to the hood 42 side.

In the example of FIG. 1, the hood 42 is provided at a position corresponding to the rear stage portion of the sintering machine, except for the final one of the plurality of wind boxes 15. Specifically, although the hood 42 is provided at a position corresponding to five from the penultimate window box, the present invention is not limited to this. The hood 42 is preferably provided at a position corresponding to about one third of the number of the windbox 15.

  As shown in FIG. 2, the boiler 45 includes a main body 61 to which high-temperature exhaust gas from the exhaust duct 43 is supplied. Inside the main body 61, a superheater 62 and an evaporator 63 each formed of a heat transfer tube. The economizer 64 is provided. Water in the steam drum 65 is circulated through the evaporator 63 by a pump 66. Then, the water in the evaporator 63 is converted into steam by the high-temperature exhaust gas flowing in the main body 61 and returned to the steam drum 65. That is, the waste heat of the exhaust gas is recovered as steam, and the recovered steam is supplied to a steam turbine and used for power generation or the like. The superheater 62 heats the steam in the steam drum 65 to superheated steam, and the economizer 64 heats the water supplied to the steam drum 65 by the heat flow in the main body 61. .

  The sintering machine waste heat recovery equipment 5 is provided on the downstream side of the exhaust dust duct 51 connected to the main exhaust gas duct 17, the simple dust remover 52 provided in the exhaust duct 51, and the simple dust remover 52 of the exhaust duct 51. The boiler 53 collects the waste heat of the exhaust gas simply removed by the simple dust remover 52 and the fan 54 provided on the downstream side of the exhaust duct 51. The exhaust duct 51 has a suction end connected to a position corresponding to the final wind box in the main exhaust gas duct 17, and a discharge end connected to the downstream side of the boiler 53 of the main exhaust gas duct 17 in the traveling direction of the pallet 11. And waste heat is collect | recovered via the duct 16 connected to the wind box 15 of the predetermined range of the second half part of the sintering machine 2. FIG.

  In the sintering machine waste heat recovery equipment 5, high-temperature exhaust gas is supplied to the boiler 53 by the fan 54 from the rear stage side of the sintering raw material layer 13 through the wind box 15, the duct 16, the main exhaust gas duct 17, and the exhaust duct 51. Supply. In the boiler 53, waste heat of exhaust gas is recovered as steam. Steam is supplied to a steam turbine and used for power generation and the like. The exhaust gas after the waste heat is recovered by the boiler 53 is supplied to the main exhaust gas duct 17 and is removed from the chimney 20 after dust is removed by the dust collector 18.

  Although the boiler 53 may be comprised similarly to the boiler 45, it is more preferable to have only an evaporator so that it may mention later.

  In the sintering machine system 1 configured as described above, a sintering raw material is charged on a circulating pallet 11 to form a sintering raw material layer 13, and an ignition furnace 12 contains the sintering raw material layer 13. The carbon material is ignited, and the carbon material is burned from above the sintered material layer 13 while sucking air from the exhaust fan 19, and the sintered material is sintered by the combustion heat at that time. The obtained sintered ore is pulverized by a crusher 21 and supplied to the sintered ore cooling device 3.

  Since the sinter 33 supplied on the pallet 31 of the sinter cooler 3 has a high temperature of 600 to 700 ° C., air is supplied by the cooling fan 37 through the air duct 36 and the wind box 35. The sintered ore 33 is cooled, and the cooled sintered ore 33 is discharged onto a conveyor and conveyed to a blast furnace.

  On the other hand, in the first half of the sinter cooler 3, since the sinter 33 is at a high temperature of 600 to 700 ° C., if air for cooling is supplied thereto, high-temperature exhaust gas is generated. For this reason, waste heat is recovered from the high-temperature exhaust gas after the sintered ore 33 is cooled by the waste heat recovery facility 4. In the waste heat recovery equipment 4, high-temperature exhaust gas is supplied to the boiler 45 through the exhaust duct 43 connected to the hood 41. In the boiler 45, the water flowing to the evaporator 63 is converted into steam by the high-temperature waste heat, and the waste heat of the exhaust gas is recovered as steam. This steam is supplied to a steam turbine and used for power generation or the like.

  Exhaust gas of about 400 ° C. is supplied to the boiler 45, and the exhaust gas after the waste heat is recovered is 150 ° C. or higher, typically about 200 ° C. As described above, since the exhaust gas after the waste heat is recovered by the boiler 45 is still at a high temperature, it is required to use it effectively. However, at this time, it is required that the equipment of the sinter cooling device is not expensive and the cooling capacity of the sinter cooling device is not lowered. Further, the exhaust gas discharged from the boiler 45 contains dust, and if it is attempted to release it into the atmosphere, a high-performance and expensive dust collector is required to make the dust concentration in the exhaust gas below the emission standard. .

  Therefore, as a technique for solving these problems at once, in the present embodiment, in the waste heat recovery facility 4, the exhaust duct 43 is connected to the hood 42, and the hot exhaust gas discharged from the sinter cooler 3 is heated by the boiler 45. In addition to the recovery, the exhaust gas after the heat recovery of the sintering machine 2 was supplied to a portion corresponding to the latter portion of the plurality of wind boxes 15 excluding at least the final one.

  That is, by supplying exhaust gas at 150 ° C. or higher, typically 200 ° C. after heat recovery by the boiler 45, to the latter half of the sintering machine 2, the area of high-temperature exhaust gas in the sintering machine 2 increases, Since the temperature also rises, the amount of effective waste heat recovery in the sintering machine 2 can be increased, and the exhaust gas after heat recovery by the waste heat recovery facility 4 of the sinter cooler 3 can be used effectively. However, when high-temperature exhaust gas is supplied to the final wind box, the high-temperature sintered ore 33 is supplied to the sintered ore cooling device 3, and the cooling capacity of the sintered ore cooling device 3 decreases. End up. For this reason, exhaust gas is supplied to at least a portion excluding the final wind box so that the heat recovery amount in the sintering machine 2 is increased and the cooling capacity of the sinter cooling device 3 is not lowered. Moreover, since the exhaust gas after waste heat recovery is collected by the dust collector 24 of the sintering machine 2, there is no need to add an expensive dust collector to the waste heat recovery facility 4 itself.

  On the other hand, in the sintering machine 2, waste heat recovery of exhaust gas is performed by a sintering machine waste heat recovery facility 5 disposed in a subsequent stage. In the sintering machine waste heat recovery equipment 5, high-temperature exhaust gas is supplied from the rear end of the main exhaust gas duct 17 to the boiler 53 via the exhaust duct 51 by the fan 54. In the boiler 53, as in the boiler 45 of the waste heat recovery facility 4, the waste heat of the exhaust gas is recovered as steam, and the steam is supplied to a steam turbine and used for power generation and the like. The exhaust gas after the waste heat is recovered by the boiler 53 is supplied to the downstream side of the main exhaust gas duct 17 and is removed from the chimney 20 after dust is removed by the dust collector 18.

  The exhaust gas after the heat recovery from the sinter cooler 3 is reduced because the exhaust gas temperature is lowered by circulating the high-temperature exhaust gas discharged from the latter half of the sintering machine 2 and recovering waste heat. When not returning to the sintering machine 2, there is a possibility that the temperature of the main exhaust gas is further lowered by the exhaust gas whose temperature has been reduced. The main exhaust gas of the sintering machine contains SOx, and the amount of heat recovered so that the main exhaust gas duct 17, dust collector 18, and fan 19 do not corrode at a low temperature due to the temperature drop. It is necessary to adjust and limit the temperature, and low temperature corrosion may occur depending on the operating conditions.

  On the other hand, in this embodiment, in the second half of the sintering machine 2, exhaust gas at 150 ° C. or higher from the waste heat recovery facility 4 of the sinter cooling device 3 is supplied, and the exhaust gas from the sintering machine 2 Since the high temperature region is widened, it is possible to prevent the main exhaust gas temperature of the sintering machine 2 after waste heat recovery from being lowered below the acid dew point. For this reason, the waste heat of the sintering machine 2 can be recovered without causing corrosion of the main exhaust gas duct 17 and the dust collector 18.

  FIG. 3 shows the image of the temperature pattern of the wind box and the sinter cooler 3 in the sintering machine 2 when the exhaust gas after waste heat recovery is not supplied (A), the final wind box in the latter half of the sintering machine 2 When exhaust gas after waste heat recovery is supplied to the range including (B), when exhaust gas after waste heat recovery is supplied to the range excluding the final wind box in the second half of the sintering machine (C) Show. 3A shows the temperature pattern of the wind box in the sintering machine 2, and FIG. 3B shows the temperature pattern of the sinter cooling device 3. As shown in FIG. 3, when exhaust gas after waste heat recovery is not supplied (A), the exhaust gas temperature of the second stage of the sintering machine 2 is low, so waste heat recovery of the exhaust gas from the sintering machine 2 is performed. This may cause the main exhaust gas temperature of the sintering machine 2 to be below the acid dew point. On the other hand, when the exhaust gas after waste heat recovery is supplied to the range including the final wind box in the latter half of the sintering machine 2 (B), the exhaust gas temperature in the latter part of the sintering machine 2 is high, so the waste heat The main exhaust gas temperature of the recovered sintering machine 2 is not likely to be below the acid dew point, but a high temperature sintered ore is supplied to the sintered ore cooling device 3 and the cooling capacity of the sintered ore cooling device 3 is reduced. There is a risk. On the other hand, when exhaust gas after waste heat recovery is supplied to the range excluding the final wind box in the latter half of the sintering machine (C), the exhaust gas temperature in the subsequent stage of the sintering machine 2 is maintained high. However, since the temperature of the portion corresponding to the final wind box is lowered and the temperature of the sintered ore supplied to the sintered ore cooling device 3 is lower than in the case of (B), Without lowering the cooling capacity, it is possible to prevent the main exhaust gas temperature of the sintering machine 2 after waste heat recovery from being below the acid dew point.

  The range of the wind box 15 for recovering the waste heat of the sintering machine 2 in the sintering machine waste heat recovery facility 5 can be adjusted by controlling the fan 54. That is, as the output of the fan 54 is increased, the range of the wind box 15 sucked toward the exhaust duct 51 becomes wider, and as the output of the fan 54 is decreased, the range of the wind box 15 sucked toward the exhaust duct 51 is narrowed. Therefore, what is necessary is just to adjust the output of the fan 54 so that the temperature of the main exhaust gas of the sintering machine 2 becomes more than the acid dew point.

  Further, the range in which the hood 42 is provided, that is, the exhaust gas supply range from the waste heat recovery equipment 4 is a range in which the main exhaust gas temperature of the sintering machine 2 after waste heat recovery does not fall below the acid dew point, and It is preferable to set the temperature of the sintered ore discharged from the kneader 2 within a suitable range. At least the range excluding the final wind box is sufficient, but if the cooling capacity of the sintered ore cooling device 3 is desired to be sufficient, the hood except for the final wind box and two or more wind boxes is excluded. 42 may be provided.

  Furthermore, as shown in FIG. 4, the hood 42 has a structure that can be moved along the traveling direction of the pallet 11 by the actuator 71, and the supply range of the exhaust gas from the waste heat recovery equipment 4 can be changed. It is also possible to adjust the wind box temperature pattern, the ore temperature, and the main exhaust gas temperature in the kneader 2. Thereby, the waste heat recovery part and the amount of recovered gas of the sintering machine can be kept constant, the main exhaust gas temperature can be changed, and the main exhaust gas temperature can be managed.

  From the viewpoint of preventing not only the corrosion of the main exhaust gas duct 17 and the dust collector 18 but also the corrosion of the boiler 53 and the like, the water supply temperature to the boiler 53 should be kept above the exhaust gas acid dew point (approximately 110 ° C. or higher). Is preferred. For this purpose, it is preferable that the boiler 53 is not provided with a economizer. In addition to the heat flow evaporator, the boiler is usually equipped with a superheater on the upstream side and a economizer on the downstream side of the boiler. Therefore, the feed water temperature to the boiler 53 can be set to the exhaust gas acid dew point temperature or more, and corrosion of the boiler 53 and the like can be prevented. Moreover, by not installing a economizer, the gas temperature at the outlet of the boiler 53 can be increased, and it becomes easier to set the main exhaust gas temperature to the acid dew point temperature or higher. Even if a economizer is installed in the boiler 53, the boiler 53 or the like does not corrode if the feed water temperature is at least the acid dew point (approximately 110 ° C. or higher). In this case, the exhaust gas temperature at the outlet of the boiler 53 is determined in relation to the amount of evaporation in the evaporator, and effectively falls only to near 200 ° C.

  Moreover, it is preferable not to install a superheater in the boiler 53. That is, it is preferable that the boiler 53 is provided with only the evaporator 82 in the main body 81 as shown in FIG. The water in the steam drum 83 is circulated through the evaporator 82 by the pump 84, and the water in the evaporator 82 is converted into steam by the high-temperature exhaust gas flowing in the main body 81 and returned to the steam drum 83. That is, the waste heat of the exhaust gas is recovered as steam, and the recovered steam is supplied to a steam turbine and used for power generation or the like.

  This not only simplifies the facility, but also increases the amount of water supply and superheater supply in the waste heat recovery facility 4 on the sinter ore cooling device 3 side, thereby reducing the exhaust gas temperature of the boiler 45. The amount of waste heat recovered by the waste heat recovery facility 4 on the side of the ore cooling device 3 can be increased. Furthermore, since the exhaust gas temperature of the boiler 45 falls, the waste heat recovery object area | region of the sinter ore cooling device 3 can be increased, Therefore A more heat recovery is attained.

  Further, the boiler 45 of the waste heat recovery facility 4 in the sinter cooler 3 and the boiler 53 of the sintering machine waste heat recovery facility 5 in the sintering machine 2 have a common steam drum and water to the evaporator. It is preferable to use a common circulation pump for forcibly circulating (steam). Thereby, equipment can be simplified, and equipment costs can be reduced, maintenance can be facilitated, and control can be facilitated.

  In the above-described example, the range of the wind box 15 for recovering the waste heat of the sintering machine 2 in the sintering machine waste heat recovery facility 5 is adjusted by controlling the fan 54. Instead of providing, as shown in FIG. 6, a plurality of shut-off valves 72 are installed at corresponding positions between the respective wind boxes 15 in the rear stage portion of the main exhaust gas duct 17, and the waste heat recovery area is changed by switching these. It can also be adjusted.

  In addition, instead of adjusting the range of the wind box 15 for recovering the waste heat of the sintering machine 2 in the sintering machine waste heat recovery equipment 5 as described above, as shown in FIG. One shutoff valve 73 is installed near the recovery boundary, and the exhaust gas temperature at the outlet of the boiler 53 is managed by enabling the duct 16 at the rear stage of the shutoff valve 73 to be switched between a waste heat recovery zone and a non-recovery zone. You may make it do.

  In the above example, the exhaust duct 51 of the sintering machine waste heat recovery facility 5 is connected to the main exhaust gas duct 17 so that the exhaust gas after the waste heat recovery is performed by the sintering machine 2 flows to the main exhaust gas duct 17. However, as shown in FIG. 8, a hood 81 is provided in the first half of the sintering machine 2 (downstream of the ignition furnace 12), and this hood 81 is connected to the exhaust duct 51 of the sintering machine waste heat recovery equipment 5. Also good. Even if it does in this way, the exhaust gas temperature of the sintering machine 2 can be raised and the possibility that the main exhaust gas temperature will fall below an acid dew point can be reduced.

Next, a second embodiment of the present invention will be described.
In the first embodiment, the waste heat recovery equipment 4 recovers the waste heat of the first half of the sinter cooler 3, and then at least the final exhaust gas from a plurality of wind boxes 15. Although the example which provided the food | hood 42 in the back | latter stage part of the sintering machine 2 was shown corresponding to the thing except for, it is a part except the at least last thing among several wind boxes (wind box) 15. If present, the present invention is not limited to this, and in this embodiment, as shown in FIG. 9, a hood 42 is provided in the first half of the sintering machine 2, and the exhaust gas after the waste heat is recovered by the waste heat recovery equipment 4 It can supply to the first half part of the sintering machine 2, and can use effectively as combustion air of the carbonaceous material in a sintering raw material.

  That is, the sensible heat of the exhaust gas of about 200 ° C. from the waste heat recovery facility 4 is imparted to the combustion air, and efficient sintering can be performed. Of course, as in the first embodiment, the exhaust gas temperature of the final wind box does not rise in the case of this embodiment, and thus the cooling capacity of the sintered ore cooling device 3 is not lowered. Thus, also in this embodiment, it is possible to effectively use the heat of exhaust gas discharged without reducing the cooling capacity of the sinter cooling device.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above embodiment, the exhaust gas after recovering the waste heat of the sinter cooler was supplied to the latter half part or the first half part of the sintering machine, but at least the final wind box of the sintering machine was used. You may supply to the whole part except. Moreover, although what moved linearly was used as a pallet of a sintering machine and a sinter ore cooling device, it may be an endless moving type by moving in a circular shape. Furthermore, although the cooling air is blown to the sintered ore in the sintered ore cooling device, the cooling air may be sucked.

  In addition, the present invention does not have to include all the components of the above-described embodiment, and the components of the above-described embodiment may be partially removed without departing from the scope of the present invention. is there.

DESCRIPTION OF SYMBOLS 1; Sinter machine system 2; Sinter machine 3; Sinter cooler 4; Waste heat recovery equipment of sinter cooler 5; Sinter waste heat recovery equipment 11; Pallet 12; Ignition furnace 13; Sinter Raw material layer 15; Wind box 16; Duct 17; Main exhaust gas duct 31; Pallet 33; Sinter 35; Wind box 36; Air duct 37; Cooling fan 41, 42; Hood 43; Exhaust duct 44; Boiler 46; Fan 51; Exhaust gas duct 52; Simple dust remover 53; Boiler

Claims (15)

After charging the sintering raw material on an endless moving pallet and igniting the sintering raw material, air is supplied to the sintering raw material through a plurality of wind boxes arranged along the pallet while moving the pallet. A sintering machine that burns carbonaceous material in the sintering raw material and sinters it with the combustion heat to produce sintered ore, and a sintering machine that is sintered and pulverized on an endless moving pallet by a sintering machine. In a sintering machine system comprising a sintered ore cooling device for charging a sintered ore and cooling the sintered ore by supplying cooling air to the sintered ore while moving the pallet, the first half of the sintered ore cooling device A waste heat recovery facility for a sinter cooler that recovers waste heat from high-temperature exhaust gas from a part,
An exhaust duct through which high-temperature exhaust gas generated from the first half of the sintered ore cooling device is guided;
A boiler that is provided in the exhaust duct and collects waste heat of exhaust gas as steam;
A fan for guiding high-temperature exhaust gas generated from the first half of the sinter cooling device to the exhaust duct;
The exhaust duct supplies waste gas after waste heat recovery to at least a portion of the sintering machine excluding the final wind box.   2. The sinter cooling according to claim 1, further comprising a hood provided at a portion excluding at least a final wind box of the sintering machine, wherein the exhaust duct is connected to the hood. Equipment waste heat recovery equipment.   The waste heat recovery facility for a sintered ore cooling apparatus according to claim 2, wherein the hood is provided in a second half portion of the sintering machine.   The waste heat recovery facility for a sintered ore cooling apparatus according to claim 3, wherein the hood is movable along the traveling direction of the pallet.   The waste heat recovery facility for a sintered ore cooling apparatus according to claim 2, wherein the hood is provided in a first half portion of the sintering machine. After charging the sintering raw material on an endless moving pallet and igniting the sintering raw material, air is supplied to the sintering raw material through a plurality of wind boxes arranged along the pallet while moving the pallet. A sintering machine that burns carbonaceous material in the sintering raw material and sinters it with the combustion heat to produce sintered ore, and a sintering machine that is sintered and pulverized on an endless moving pallet by a sintering machine. In a sintering machine system comprising a sintered ore cooling device for charging a sintered ore and cooling the sintered ore by supplying cooling air to the sintered ore while moving the pallet, the first half of the sintered ore cooling device A waste heat recovery method for a sintered ore cooling device that recovers waste heat from a high temperature exhaust gas of a part,
High-temperature exhaust gas generated from the first half of the sinter cooling device is led to the exhaust duct, and waste heat of the exhaust gas guided by the boiler provided in the exhaust duct is recovered as steam, after the waste heat is recovered A waste heat recovery method for a sintered ore cooling apparatus, characterized in that exhaust gas is supplied to a portion of the sintering machine excluding at least the final wind box.   The waste heat recovery method for a sintered ore cooling apparatus according to claim 6, wherein the exhaust gas after the waste heat has been recovered is supplied to a second half portion of the sintering machine.   The waste heat recovery method for a sintered ore cooling apparatus according to claim 7, wherein a supply range of the exhaust gas is variable.   The waste heat recovery method for a sintered ore cooling apparatus according to claim 6, wherein the exhaust gas after the waste heat is recovered is supplied to the first half of the sintering machine. After charging the sintering raw material on an endless moving pallet and igniting the sintering raw material, air is supplied to the sintering raw material through a plurality of wind boxes arranged along the pallet while moving the pallet. A sintering machine that burns the carbonaceous material in the sintering raw material and sinters with the combustion heat to produce a sintered ore,
Sintering is performed by charging sintered ore that has been sintered and pulverized by a sintering machine onto an endless moving pallet, and cooling the sinter by supplying cooling air to the sinter while moving the pallet. A mine cooling device;
A sintering machine system having waste heat recovery equipment for sinter ore cooling equipment for recovering waste heat from high-temperature exhaust gas in the first half of the sinter ore cooling equipment,
The waste heat recovery equipment is
An exhaust duct through which high-temperature exhaust gas generated from the first half of the sintered ore cooling device is guided;
A boiler that is provided in the exhaust duct and collects waste heat of exhaust gas as steam;
A fan that sucks high-temperature exhaust gas generated from the first half of the sintered ore cooling device into the exhaust duct;
The exhaust duct supplies exhaust gas after waste heat recovery to a portion of the sintering machine excluding at least the final wind box,
The sintering machine system further includes a sintering machine waste heat recovery facility for recovering waste heat from exhaust gas in a latter half portion of the sintering machine using a boiler.   The sintering machine system according to claim 10, wherein the sintering machine waste heat recovery facility supplies exhaust gas after recovering waste heat as a combustion gas to a first half portion of the sintering machine.   The sintering machine system according to claim 10, wherein the sintering machine waste heat recovery facility supplies exhaust gas after recovering waste heat to the first half of the sintering machine.   The firing according to any one of claims 10 to 12, wherein a feed water temperature to the boiler of the waste heat recovery facility of the sintering machine is equal to or higher than an acid dew point of the exhaust gas of the sintering machine. The machine system.   14. The sintering machine system according to claim 13, wherein the boiler of the sintering machine waste heat recovery facility has an evaporator, and no economizer and superheater are installed. The sintering machine system according to claim 14, wherein the boiler of the sintering machine waste heat recovery facility and the boiler of the waste heat recovery facility have a common steam drum and a common circulation pump. .

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