JP5755042B2 - Waste heat recovery equipment, waste heat recovery method, and sintering machine system - Google Patents

Description

  The present invention relates to a waste heat recovery facility, a waste heat recovery method, and a sintering machine system used in a sintering machine system for producing 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. Such a sintering machine and a sintered ore cooling device constitute a sintering machine system.

  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, high-temperature exhaust gas discharged from the first half of the cooling device is removed with a relatively simple dust remover to the extent that it does not affect the subsequent equipment, and then heat recovery is performed with a boiler, followed by dust collection at the subsequent stage. A simple dust remover removes high-temperature exhaust gas discharged from the first half of the cooling device or technology (for example, Non-Patent Document 1) after removing dust to the atmosphere with a dust concentration that can be released to the atmosphere. After that, a technique (for example, Patent Document 1) is known in which heat recovery is performed by a boiler, and the exhaust gas whose temperature has been reduced by heat recovery is circulated and reused as cooling gas for the first half of the cooling device.

  As a dust remover used in such waste heat recovery equipment, an inertial force dust remover represented by a louver type and a centrifugal force dust remover represented by a cyclone are widely used. For the purpose of improvement, a blow-down method in which a part of gas is extracted from a lower dust collection hopper is used (for example, Patent Document 2). The blow-down exhaust gas extracted from this dust collection hopper contains a large amount of dust, so it cannot be used as it is, and it can be merged with the existing dust collection system and released into the atmosphere, or it can be used separately. Measures are taken such as returning to the gas after passing through the boiler after removing the dust with the dust collector.

JP-A-53-18041 JP-A-57-174687

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

  By the way, the blowdown exhaust gas extracted from the dust collection hopper at the lower part of the dust remover has a sensible heat of about 400 ° C. However, as described above, it joins the existing dust collection system and releases it to the atmosphere. When the dust is removed by a separate high-performance dust collector and then returned to the gas after passing through the boiler, the sensible heat of the blowdown exhaust gas extracted from the lower hopper is not effectively used.

  The present invention has been made in view of such a situation. When a blow-down method is used as a dust remover used when recovering waste heat, the blow-down exhaust gas extracted from the dust collection hopper of the dust remover is revealed. It is an object of the present invention to provide a waste heat recovery facility, a waste heat recovery method, and a sintering machine system for use in a sintering machine system that can effectively use heat.

  In order to solve the above-mentioned problems, in the first aspect of the present invention, a sintered raw material is charged onto an endless moving pallet, and after igniting the sintered raw material in an ignition furnace, the pallet is moved while moving the pallet. A sintering machine for producing sintered ore by burning air with the combustion heat by supplying air to the sintering raw material through a plurality of wind boxes arranged along The sintered ore which is sintered and pulverized by a sintering machine is charged onto an endless moving pallet, and cooling air is supplied to the sinter while cooling the sinter by moving the pallet. A waste heat recovery facility for recovering waste heat from high-temperature exhaust gas generated in a sintering machine system having a ore cooling device, an exhaust duct through which high-temperature exhaust gas is guided, and an inertial force provided in the exhaust duct Blow-down type removal consisting of a dust remover or centrifugal dust remover An exhaust duct, a boiler provided on the exhaust duct downstream of the dust remover, for recovering waste heat of the exhaust gas removed by the dust remover, and a squeezer extracted from a dust collecting hopper provided at a lower portion of the dust remover. A heat supply duct for guiding the blowdown exhaust gas having heat to the ignition furnace of the sintering machine, a fan for forming a flow of the blowdown exhaust gas toward the ignition furnace in the heat supply duct, and the heat supply duct A waste heat recovery facility is provided that includes a dust collector provided and uses the blow-down exhaust gas as combustion air of the ignition furnace and / or preheated air of fuel.

  In the first aspect, examples of the waste heat recovery facility include one that recovers waste heat from the high-temperature exhaust gas in the first half of the sinter cooling device. In this case, the exhaust duct is configured to return the exhaust gas cooled by recovering waste heat by the boiler to the first half of the sinter cooling device, and the exhaust duct is provided with a fan, The exhaust gas may be circulated by this fan, and the exhaust duct may supply exhaust gas cooled by exhaust heat recovered by the boiler to the sintering machine. In the latter case, the exhaust gas whose waste heat has been recovered by the boiler and cooled may be supplied to the latter half of the sintering machine or to the first half. Moreover, what can collect | recover waste heat from the high temperature waste gas of the said sintering machine can be mentioned as waste heat recovery equipment.

  In the second aspect of the present invention, a sintered raw material is charged on an endless movable pallet, and after igniting the sintered raw material in an ignition furnace, a plurality of the raw materials are arranged along the pallet while moving the pallet. A sintering machine that produces sintered ore by burning carbonaceous material in the sintering raw material by supplying air to the sintering raw material through an air box, and on an endless moving pallet And a sintered ore cooling device for charging the sintered ore with cooling air while charging the sintered ore while moving the pallet while charging the sintered ore which has been sintered with a sintering machine. A waste heat recovery method that recovers waste heat from the high-temperature exhaust gas generated in the sintering machine system. The blow-down type dust removal is performed by introducing the high-temperature exhaust gas to the exhaust duct and consisting of an inertia force dust remover or a centrifugal dust remover. After removing the exhaust gas with a vessel, the waste heat of the exhaust gas is removed with a boiler. The blowdown exhaust gas having sensible heat that is recovered as gas and extracted from a dust collection hopper provided at the lower part of the dust remover is guided to the ignition furnace of the sintering machine, and combustion air and / or fuel of the ignition furnace Provided is a waste heat recovery method characterized by being used as preheated air.

  In the second aspect, examples of the waste heat recovery method include recovering waste heat from the high-temperature exhaust gas in the first half of the sinter cooling device. In this case, the cooled exhaust gas after recovering waste heat from the high-temperature exhaust gas in the first half of the sinter cooling device may be returned to the first half of the sinter cooling device and circulated. You may make it supply the cooled exhaust gas after collect | recovering waste heat from the high temperature exhaust gas of the first half part of a sintered ore cooling device to the said sintering machine. In the latter case, the cooled exhaust gas after recovering the waste heat may be supplied to the latter half part of the sintering machine or to the first half part. Moreover, as a waste heat recovery method, a method of recovering waste heat from the high-temperature exhaust gas of the sintering machine can be mentioned.

  In a third aspect of the present invention, a sintered raw material is charged onto an endless moving pallet, and after igniting the sintered raw material in an ignition furnace, a plurality of the raw materials are arranged along the pallet while moving the pallet. A sintering machine that produces sintered ore by burning carbonaceous material in the sintering raw material by supplying air to the sintering raw material through an air box, and on an endless moving pallet A sintered ore cooling device for charging the sintered ore with cooling air supplied to the sintered ore while moving the pallet while charging the sintered ore which has been sintered and pulverized by a sintering machine. A sintering machine system having a waste heat recovery facility for a sintered ore cooling device that recovers waste heat from a high-temperature exhaust gas in a first half portion of the ore cooling device, wherein the waste heat recovery facility includes the sintered ore An exhaust duct through which high-temperature exhaust gas generated from the first half of the cooling device is guided, and the exhaust duct A blow-down type dust remover consisting of an inertial force dust remover or a centrifugal dust remover and a downstream side of the dust remover of the exhaust duct and recovering waste heat of the exhaust gas removed by the dust remover A boiler, a heat supply duct for introducing blowdown exhaust gas having sensible heat extracted from a dust collection hopper provided at a lower portion of the dust remover to the ignition furnace of the sintering machine, and the blowdown in the heat supply duct A fan that forms a flow of exhaust gas toward the ignition furnace, and a dust collector provided in the heat supply duct, wherein the blowdown exhaust gas is used as combustion air for the ignition furnace and / or fuel preheating air Provided is a sintering machine system characterized by being used.

  In the third aspect, the apparatus further includes a sintering machine waste heat recovery facility that recovers waste heat from the high-temperature exhaust gas of the sintering machine, and the sintering machine waste heat recovery facility is generated from the sintering machine. An exhaust duct through which high-temperature exhaust gas is guided, a blow-down type dust remover consisting of an inertia force dust remover or a centrifugal dust remover provided in the exhaust duct, and a downstream side of the dust remover of the exhaust duct, A boiler that recovers waste heat of the exhaust gas removed by the dust remover, and a blowdown exhaust gas having sensible heat extracted from a dust collection hopper provided at a lower portion of the dust remover is guided to the ignition furnace of the sintering machine. A heat supply duct, a fan that forms a flow of the blowdown exhaust gas toward the ignition furnace in the heat supply duct, and a dust collector provided in the heat supply duct, the blowdown exhaust gas, Said point It is preferable that used as preheated air for combustion air and / or fuel in the furnace.

Also, said exhaust duct of the waste heat recovery equipment of the sinter cooler, the exhaust gas waste heat is cooled is recovered by the boiler, configured to return to the first half of the sinter cooler The exhaust duct is provided with a fan, and the exhaust gas can be circulated by the fan. Further, the exhaust duct of the waste heat recovery facility of the sintered ore cooling device may be configured to supply exhaust gas, which has been cooled by recovering waste heat by the boiler, to the sintering machine. In this case, the exhaust duct, the exhaust gas waste heat is cooled is recovered by the boiler, even to supply the latter half of the sintering machine, even to supply the first half Good.

  According to the present invention, when a blow down system is used as a dust remover used when recovering waste heat, a blow down exhaust gas having sensible heat extracted from a dust collection hopper provided at a lower portion of the dust remover is ignited in an ignition furnace. Therefore, the sensible heat of the blowdown exhaust gas can be effectively used.

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 block diagram which shows the sintering machine system which concerns on the 2nd Embodiment of this invention. It is a schematic block diagram which shows the sintering machine system which concerns on the 3rd Embodiment of this invention. It is a schematic block diagram which shows the sintering machine system which concerns on the 4th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

<First Embodiment>
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. And a waste heat recovery facility 4 for recovering the heat of the exhaust gas discharged from the portion.

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 21 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 by a chute 32 onto the pallet 31. 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. The air duct 36 is divided into a plurality of zones. As will be described later, the exhaust gas from the waste heat recovery facility 4 is circulated and supplied to the most upstream zone. A cooling fan 37 is connected. The exhaust gas from the waste heat recovery facility 4 and the cooling air from the cooling fan 37 are sent to the sintered ore 33 on the pallet 31 through the air duct 36 and the wind box 35, and the sintered ore 33 is cooled. It has come to be. A conveyor (not shown) is provided on the outlet side of the pallet 31, and the sintered ore cooled to about 100 ° C. or less is discharged from the pallet 31 to the conveyor and conveyed to the 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. A hood 41 for recovering waste heat from exhaust gas, a hood 41 provided above the pallet 31 movement path in the first half of the sinter cooler 3, a zone on the most upstream side of the hood 41 and the air duct 36, A circulation exhaust duct 43 for connecting the two, a dust remover 44 having a relatively simple structure of a blow-down system comprising an inertia force dust remover or a centrifugal force dust remover provided in the circulation exhaust duct 43, and a dust remover of the circulation exhaust duct 43 44, provided on the downstream side of the boiler 45 of the circulation exhaust duct 43, for recovering the waste heat of the exhaust gas removed from the dust by the dust remover 44. A fan 46 that pulls back into the zone on the most upstream side of the air duct 36 and a heat supply duct that guides blowdown exhaust gas having sensible heat extracted from the dust collection hopper 44 a provided at the lower portion of the dust remover 44 to the ignition furnace 12. 47, a high-performance dust collector 48 such as a multi-cyclone provided in the heat supply duct 47, and a fan 49 that forms a flow of blowdown exhaust gas toward the ignition furnace 12 in the heat supply duct 47. Yes.

  An inertia force dust remover represented by a louver type and a centrifugal force dust remover represented by a cyclone constituting the dust remover 44 are introduced with exhaust gas containing a large amount of dust, and guide the dust to a lower dust collection hopper 44a. At the same time, the dust-removed exhaust gas from which dust has been removed is guided to the boiler 45. Then, an amount of about 3% of the exhaust gas introduced into the dust remover 44 is guided from the dust collection hopper 44 a to the heat supply duct 47 through the dust collector 48.

  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 circulation exhaust duct 43 connected to the hood 41. In the boiler 45, water flowing to an evaporator (not shown) provided in the boiler 45 is converted into steam by 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. Further, the exhaust gas whose temperature has been lowered by heat recovery is returned to the zone on the uppermost stream side of the blower duct 36 and circulated and reused as a cooling gas for the first half of the sinter cooler 3. For this reason, since the exhaust gas containing the dust discharged from the boiler 45 is not released into the atmosphere, a high-performance and expensive dust collector for reducing the dust concentration in the exhaust gas to the emission standard or lower is unnecessary.

  In the blow-down type dust remover 44 composed of an inertial force dust remover or a centrifugal dust remover used in the waste heat recovery facility 4, dust is stored in a dust collection hopper 44a provided in the lower part thereof for the purpose of improving dust removal efficiency. Then, a part of the exhaust gas is extracted as blowdown exhaust gas from the dust collection hopper 44a. The blow-down exhaust gas extracted from the dust collection hopper 44a contains a large amount of dust, so it cannot be used as it is. Conventionally, it is merged with an existing dust collection system and released to the atmosphere. Measures were taken such as removing the dust with a separate high-performance dust collector and returning it to the gas after passing through the boiler.

  However, the temperature of the blowdown exhaust gas extracted from the dust collection hopper at the bottom of the dust remover is about 400 ° C. and has sensible heat. This sensible heat is thrown away when it is discharged into the gas or returned to the gas after passing through the boiler after being removed by a separate high-performance dust collector.

  Therefore, in the present embodiment, the blowdown exhaust gas extracted from the dust collection hopper 44 a provided at the lower portion of the dust remover 44 is removed by the high performance dust collector 48 and then burned by the fan 49 via the heat supply duct 47. It leads to the ignition furnace 12 of the machine 2 and effectively uses the sensible heat of the exhaust gas. That is, after collecting high-temperature blowdown exhaust gas with a high-performance dust collector 48, the exhaust gas is supplied to the ignition furnace 12 of the sintering machine and used as combustion air for the ignition furnace and / or fuel preheating air, The sensible heat of blowdown exhaust gas can be used effectively.

Exhaust gas amount in the waste heat recovery equipment 4 is because of the order 500~800Nm ³ / t-s, blowdown gas is 12~26Nm ³ / t-s about its around 3%. On the other hand, the amount of combustion air used in the ignition furnace 12 of the sintering machine 2 is approximately 10 to 20 Nm ³ / ts, so that the combustion air used in the ignition furnace 12 can be substantially covered with blowdown exhaust gas. It will be. In addition, when the amount of blowdown exhaust gas is larger than the required amount of ignition air for the ignition furnace, it can be used for preheating air for fuel, preheating air for sintered ore, and the like.

  A method of using the exhaust gas of the sintered ore cooling device as the combustion air of the ignition furnace is disclosed in, for example, Japanese Patent Application Laid-Open No. 57-193339, but when this method is adopted, the combustion air of the ignition furnace is disclosed. In addition, only the exhaust gas required for the preheated air can be used, and the waste heat recovery efficiency is low. Also, when trying to perform both waste heat recovery by the boiler and the waste heat recovery by sending it as combustion air to the ignition furnace, in addition to the dust collector used for blowdown exhaust gas, A dust collector for the exhaust gas supplied to the furnace is also required. Especially, the exhaust gas sent to the ignition furnace burner needs to be equipped with a high-performance dust collector to prevent wear due to dust. There is a problem that two units are required and the equipment cost is expensive.

  On the other hand, in this embodiment, after the blow-down exhaust gas from the dust collection hopper 44a of the dust remover 44 in the waste heat recovery facility of the sinter ore cooling device 3 is removed by the high-performance dust collector 48, the ignition furnace 12 is used. As a high-performance dust collector, only the blowdown exhaust gas that was originally required is required, and the equipment cost can be reduced. Further, the amount of blowdown exhaust gas is almost equal to the required amount in the ignition furnace 12, and exhaust gas other than the blowdown exhaust gas of the sinter cooler 3 is used for waste heat recovery by the boiler 45, so that waste heat recovery efficiency is high. .

<Second Embodiment>
Next, a second embodiment will be described. FIG. 2 is a schematic configuration diagram showing a sintering machine system according to the second embodiment of the present invention.

  The sintering machine system 101 of the second embodiment is configured in the same manner as the sintering machine system 1 of the first embodiment except that the sintering machine waste heat recovery facility 5 is provided in the sintering machine 2. In FIG. 2, the same components as those in FIG.

  The sintering machine waste heat recovery equipment 5 has a relatively simple structure of a blow-down method comprising an exhaust duct 51 connected to the main exhaust gas duct 17 and an inertial dust remover or a centrifugal dust remover provided in the exhaust duct 51. , A boiler 53 provided on the exhaust duct 51 downstream of the dust remover 52 for recovering waste heat of the exhaust gas removed by the dust remover 52, and a fan provided on the downstream side of the exhaust duct 51. 54, a heat supply duct 55 for introducing blowdown exhaust gas having sensible heat extracted from a dust collection hopper 52a provided at the lower portion of the dust remover 52 to the ignition furnace 12, a multi-cyclone provided in the heat supply duct 55, and the like. A high-performance dust collector 56 and a fan 57 that forms a flow of blowdown exhaust gas toward the ignition furnace 12 in the heat supply duct 55 are provided.

  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.

  In the sintering machine waste heat recovery equipment 5, when the temperature of the main exhaust gas falls below the acid dew point, the main exhaust duct 17, the dust collector 18, and the fan 19 are corroded at low temperature by SOx contained in the main exhaust gas. Adjust and limit heat recovery to prevent it.

The inertia force dust remover represented by the louver type and the centrifugal dust remover represented by the cyclone constituting the dust remover 52 are introduced with exhaust gas containing a large amount of dust, and guide the dust to the lower dust collecting hopper 52a. At the same time, the dust-removed exhaust gas from which the dust has been removed is guided to the boiler 53. Then, an amount of about 3% of the exhaust gas introduced into the dust remover 52 is led from the dust collection hopper 52 a to the heat supply duct 55 through the dust collector 56. Thereby, the sensible heat of the blowdown exhaust gas of the dust remover 52 which has not been conventionally used can also be effectively used in the ignition furnace 12. Exhaust gas amount in the sintering machine waste heat recovery equipment 5 is because of the order 300~400Nm ³ / t-s, blowdown gas is 7~14Nm ³ / t-s about its around 3%. On the other hand, since the amount of combustion air used in the ignition furnace 12 of the sintering machine 2 is approximately 10 to 20 Nm ³ / ts, more than half of the combustion air used in the ignition furnace 12 is blown down exhaust gas. It will be able to cover. However, since the exhaust gas of the sintering machine 2 used in the sintering machine waste heat recovery facility 5 contains SOx, the amount of oxygen gas is less than that of the exhaust gas of the sinter ore cooling device 3 and is not much as combustion air for the ignition furnace. Not suitable. Therefore, it is preferable to use the blowdown exhaust gas from the dust remover 52 as fuel preheated air.

  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, the larger the output of the fan 54, the wider the range of the wind box 15 sucked to the exhaust duct 51 side, and the smaller the output of the fan 54, the wider the wind box 15 sucked to the exhaust duct 51 side. The range can be narrowed. For this reason, the range of the wind box 15 for recovering waste heat is adjusted by controlling the output of the fan 54 so that the temperature of the main exhaust gas becomes equal to or higher than the acid dew point.

  Instead of providing the fan 54, a waste heat recovery area can be adjusted by installing a plurality of shut-off valves at corresponding positions between the wind boxes 15 in the rear stage portion of the main exhaust gas duct 17 and switching them. .

<Third Embodiment>
Next, a third embodiment will be described. FIG. 3 is a schematic configuration diagram showing a sintering machine system according to a third embodiment of the present invention.

  In the sintering machine system 201 of the third embodiment, a waste heat recovery facility 4 ′ different from the circulation type waste heat recovery facility 4 in the first and second embodiments is used for the sinter cooler 3. Is configured in the same manner as the sintering machine system 101 of the second embodiment, the same components in FIG. 3 as those in FIG.

  The waste heat recovery equipment 4 ′ has a hood 42 provided at a rear stage portion of the plurality of wind boxes 15 and an exhaust duct 43 ′ connecting the hood 41 and the hood 42, instead of providing the circulation exhaust duct 43. Only the difference is from the waste heat recovery equipment 4. The hood 42 is provided with a width corresponding to five of the wind boxes 15, but 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.

  In the present embodiment, the sintering raw material is sintered by the sintering machine 2, the sintered ore is cooled by the sinter cooling device 3, and the first half of the sinter cooling device 3 is sintered by the waste heat recovery equipment 4 ′. The waste heat is recovered from the high-temperature exhaust gas after cooling the ore 33, and the sensible heat of the blow-down exhaust gas from the dust collection hopper 44a in the dust remover 44 of the waste heat recovery equipment 4 'can be effectively used. The same effects as those of the first and second embodiments can be obtained.

  In this embodiment, in addition to this, the exhaust gas at about 400 ° C. is supplied to the boiler 45 of the waste heat recovery equipment 4 ′, and the exhaust gas after the waste heat is recovered is 150 ° C. or higher, typically Since the temperature is about 200 ° C., the exhaust gas after the waste heat is recovered is effectively used. However, at this time, it is required not to make the equipment of the sinter cooling device expensive. Further, the exhaust gas discharged from the boiler 45 is required to require no high-performance and expensive dust collecting device for removing dust. Therefore, in the present embodiment, in the waste heat recovery facility 4 ′, the exhaust duct 43 ′ is connected to the hood 42, and the high-temperature exhaust gas discharged from the sinter cooler 3 is recovered by the boiler 45, and the heat recovery is performed. The later exhaust gas was supplied to the latter part of a plurality of wind boxes (wind boxes) 15 of the sintering machine 2.

  By supplying exhaust gas of 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 is increased, and the exhaust gas temperature is also increased. Therefore, the effective amount of waste heat recovered in the sintering machine 2 can be increased, and the exhaust gas after heat recovery by the waste heat recovery equipment 4 ′ of the sinter cooler 3 can be used effectively. That is, 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 the waste heat by the sintering machine waste heat recovery facility 5, so that the sintered ore cooling device In the case where the exhaust gas after heat recovery from 3 is not returned to the sintering machine 2, the main exhaust gas temperature may be further decreased by the exhaust gas whose temperature has decreased. 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 latter 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 is supplied. Therefore, it is possible to prevent the main exhaust gas temperature of the sintering machine 2 after waste heat recovery from decreasing 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. Further, since the exhaust gas after waste heat recovery is collected by the dust collector 24 of the sintering machine 2, it is not necessary to add an expensive dust collector to the waste heat recovery facility 4 'itself.

  In this case, the exhaust gas after the waste heat is recovered by the waste heat recovery equipment 4 ′ is supplied to a portion corresponding to the downstream portion of the plurality of wind boxes 15 and at least the final one. By doing so, the temperature rise of the sinter 33 can be suppressed in the final wind box, and the sinter ore cooling device 3 due to the high temperature of the sinter 33 supplied to the sinter ore cooling device 3 is achieved. It is possible to prevent the cooling capacity from being lowered.

<Fourth Embodiment>
Next, a fourth embodiment of the present invention will be described. FIG. 4 is a schematic configuration diagram showing a sintering machine system according to the fourth embodiment of the present invention.

  In the waste heat recovery facility 4 ′ of the third embodiment, after recovering the waste heat of the first half of the sinter cooler 3, the exhaust gas is discharged from the plurality of wind boxes 15 in the subsequent stage of the sintering machine 2. Although the example which provided the hood 42 in the part was shown, in this embodiment, only the point which has provided the hood 42 in the front half part of the sintering machine 2 instead of the waste heat recovery equipment 4 'is shown. A waste heat recovery facility 4 "different from 'is provided.

  In the present embodiment, the exhaust gas after the waste heat is recovered by the waste heat recovery equipment 4 ″ can be supplied to the first half of the sintering machine 2 and effectively used as combustion air for the carbonaceous material in the sintered raw material. .

  That is, the sensible heat of the exhaust gas of about 200 ° C. from the waste heat recovery equipment 4 ″ is imparted to the combustion air, so that efficient sintering can be performed. In the present embodiment, the sintering machine 2 Since the hood 42 is provided in the first half, the cooling capacity of the sintered ore cooling device 3 is not lowered.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above embodiment, the sensible heat of the blowdown exhaust gas from the waste heat recovery facility of the sinter ore cooling device is supplied to the ignition furnace, or in addition to this, the blowdown exhaust gas from the sintering machine waste heat recovery facility In the above example, the sensible heat is supplied to the ignition furnace, but only the sensible heat of the blowdown exhaust gas from the sintering machine waste heat recovery facility may be supplied to the ignition furnace. Moreover, although the example which supplied the exhaust gas after recovering waste heat with the waste heat recovery equipment of a sinter ore cooling device was supplied to the latter half part or the first half part of the sintering machine was shown, Good. Furthermore, 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.

1, 101, 201, 301; Sinter system 2; Sinter 3; Sinter cooler 4, 4 ', 4 "; Waste heat recovery equipment of sinter cooler 5; Sinter waste heat recovery Equipment 11; Pallet 12; Ignition furnace 13; Sintering 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 fans 41, 42; Hood 43; Circulation exhaust duct 43 '; Exhaust duct 44; Dust collector 44a; Dust collector hopper 45; Boiler 46; Fan 47; Heat supply duct 48; Dust collector 49; Fan 51; Exhaust duct 52; Dust hopper 53; Boiler 54; Fan 55; Heat supply duct 56; Dust collector 57; Fan

Claims (20)

After charging the sintering raw material on an endless mobile pallet and igniting the sintering raw material in an ignition furnace, the sintering raw material is passed through a plurality of wind boxes arranged along the pallet while moving the pallet. Sintering machine which burns carbonaceous material in sintering raw material by supplying air and sinters with the combustion heat to produce sintered ore, and is sintered with sintering machine on endless moving pallet A high temperature generated in a sintering machine system having charged sinter ore and supplying cooling air to the sinter while cooling the sinter by moving the pallet and cooling the sinter. A waste heat recovery facility that recovers waste heat from exhaust gas,
An exhaust duct through which hot exhaust gas is guided;
A blow-down type dust remover comprising an inertial force dust remover or a centrifugal force dust remover provided in the exhaust duct;
A boiler that is provided on the downstream side of the dust remover of the exhaust duct, and that recovers waste heat of the exhaust gas removed by the dust remover;
A heat supply duct for guiding blowdown exhaust gas having sensible heat extracted from a dust collection hopper provided at a lower portion of the dust remover to the ignition furnace of the sintering machine;
A fan forming a flow of the blowdown exhaust gas toward the ignition furnace in the heat supply duct;
A dust collector provided in the heat supply duct;
Waste heat recovery equipment using the blowdown exhaust gas as combustion air for the ignition furnace and / or preheating air for fuel.   The waste heat recovery facility according to claim 1, wherein the waste heat recovery facility recovers waste heat from high-temperature exhaust gas in a first half portion of the sintered ore cooling device.   The exhaust duct is configured to return the exhaust gas cooled by recovering waste heat by the boiler to the first half portion of the sintered ore cooling device, and the exhaust duct is provided with a fan, and the exhaust gas is exhausted by the fan. The waste heat recovery facility according to claim 2, wherein the waste heat recovery facility is circulated.   The waste heat recovery facility according to claim 2, wherein the exhaust duct supplies exhaust gas cooled by exhaust heat recovered by the boiler to the sintering machine.   The waste heat recovery equipment according to claim 4, wherein the exhaust duct supplies exhaust gas cooled by waste heat recovered by the boiler to a second half portion of the sintering machine.   The waste heat recovery equipment according to claim 4, wherein the exhaust duct supplies exhaust gas cooled by waste heat recovered by the boiler to the first half of the sintering machine.   The waste heat recovery facility according to claim 1, wherein the waste heat recovery facility recovers waste heat from high-temperature exhaust gas of the sintering machine. After charging the sintering raw material on an endless mobile pallet and igniting the sintering raw material in an ignition furnace, the sintering raw material is passed through a plurality of wind boxes arranged along the pallet while moving the pallet. Sintering machine which burns carbonaceous material in sintering raw material by supplying air and sinters with the combustion heat to produce sintered ore, and is sintered with sintering machine on endless moving pallet A high temperature generated in a sintering machine system having charged sinter ore and supplying cooling air to the sinter while cooling the sinter by moving the pallet and cooling the sinter. A waste heat recovery method for recovering waste heat from exhaust gas,
Hot exhaust gas is guided to the exhaust duct and exhaust gas is removed with a blow-down type dust remover consisting of an inertia force dust remover or a centrifugal dust remover, and the waste heat of the exhaust gas is recovered as steam by a boiler. A blowdown exhaust gas having sensible heat extracted from a dust collection hopper provided in the sinter is guided to the ignition furnace of the sintering machine and used as combustion air of the ignition furnace and / or fuel preheating air. Waste heat recovery method.   The waste heat recovery method according to claim 8, wherein waste heat is recovered from high-temperature exhaust gas in the first half of the sinter cooler.   The cooled exhaust gas after recovering waste heat from the high-temperature exhaust gas in the first half of the sinter cooling device is circulated back to the first half of the sinter cooling device. Waste heat recovery method.   The waste heat recovery method according to claim 9, wherein the exhaust gas cooled after recovering the waste heat from the high temperature exhaust gas in the first half of the sintered ore cooling device is supplied to the sintering machine.   The waste heat recovery according to claim 11, wherein the exhaust gas cooled after recovering the waste heat from the high temperature exhaust gas in the first half portion of the sinter cooling device is supplied to the second half portion of the sintering machine. Method.   The waste heat recovery according to claim 11, wherein the exhaust gas cooled after recovering the waste heat from the high temperature exhaust gas in the first half of the sinter cooler is supplied to the first half of the sintering machine. Method.   The waste heat recovery method according to claim 8, wherein waste heat is recovered from high-temperature exhaust gas of the sintering machine. After charging the sintering raw material on an endless mobile pallet and igniting the sintering raw material in an ignition furnace, the sintering raw material is passed through a plurality of wind boxes arranged along the pallet while moving the pallet. A sintering machine for producing a sintered ore by burning the carbonaceous material in the sintering raw material by supplying air and sintering with the combustion heat;
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 blow-down type dust remover comprising an inertial force dust remover or a centrifugal force dust remover provided in the exhaust duct;
A boiler that is provided on the downstream side of the dust remover of the exhaust duct, and that recovers waste heat of the exhaust gas removed by the dust remover;
A heat supply duct for guiding blowdown exhaust gas having sensible heat extracted from a dust collection hopper provided at a lower portion of the dust remover to the ignition furnace of the sintering machine;
A fan forming a flow of the blowdown exhaust gas toward the ignition furnace in the heat supply duct;
A dust collector provided in the heat supply duct;
A sintering machine system using the blowdown exhaust gas as combustion air of the ignition furnace and / or preheating air of fuel. Further comprising a sintering machine waste heat recovery facility for recovering waste heat from the high-temperature exhaust gas of the sintering machine,
The sintering machine waste heat recovery equipment is
An exhaust duct through which high-temperature exhaust gas generated from the sintering machine is guided;
A blow-down type dust remover comprising an inertial force dust remover or a centrifugal force dust remover provided in the exhaust duct;
A boiler that is provided on the downstream side of the dust remover of the exhaust duct, and that recovers waste heat of the exhaust gas removed by the dust remover;
A heat supply duct for guiding blowdown exhaust gas having sensible heat extracted from a dust collection hopper provided at a lower portion of the dust remover to the ignition furnace of the sintering machine;
A fan forming a flow of the blowdown exhaust gas toward the ignition furnace in the heat supply duct;
A dust collector provided in the heat supply duct;
The sintering machine system according to claim 15, wherein the blowdown exhaust gas is used as combustion air of the ignition furnace and / or preheated air of fuel. The exhaust duct of the waste heat recovery equipment of the sinter ore cooling device is configured to return the exhaust gas that has been recovered from the waste heat and cooled by the boiler to the first half of the sinter ore cooling device, and The sintering machine system according to claim 15 or 16, wherein a fan is provided in the exhaust duct, and exhaust gas is circulated by the fan. 16. The exhaust duct of the waste heat recovery facility of the sintered ore cooling device supplies exhaust gas cooled by waste heat recovered by the boiler to the sintering machine. Item 17. The sintering machine system according to Item 16. Wherein said exhaust duct of the waste heat recovery equipment of the sinter cooler, claims the exhaust gas waste heat is cooled is recovered by the boiler, and supplying to the latter half of the sintering machine The sintering machine system according to claim 18. Wherein said exhaust duct of the waste heat recovery equipment of the sinter cooler, claims the exhaust gas waste heat is cooled is recovered by the boiler, and supplying to the first half of the sintering machine The sintering machine system according to claim 18.

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