CN210718691U - Vertical cooling sensible heat recovery system for sinter and waste heat comprehensive utilization system thereof - Google Patents
Vertical cooling sensible heat recovery system for sinter and waste heat comprehensive utilization system thereof Download PDFInfo
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- CN210718691U CN210718691U CN201920526482.2U CN201920526482U CN210718691U CN 210718691 U CN210718691 U CN 210718691U CN 201920526482 U CN201920526482 U CN 201920526482U CN 210718691 U CN210718691 U CN 210718691U
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Abstract
The utility model provides a vertical cooling sensible heat recovery system of sintering deposit and waste heat comprehensive utilization system thereof, including sintering system, single roll crusher and feed system, feed system one end is connected with cooling device, cooling device one side is connected with waste heat recovery device and blast air device respectively, waste heat recovery device is equipped with first flue gas outlet, first flue gas outlet is connected with dust collector, the exit of dust collector connects gradually induced air device and fume extractor; the system comprises a vertical type cooling sensible heat recovery system for the sinter, wherein one side of a waste heat boiler with a settling chamber is connected with a sintering waste heat energy recovery dragging device, one side of the sintering waste heat energy recovery dragging device is sequentially connected with a condensing device, a condensate pump, a deoxidizing device and a boiler water feed pump, and the boiler water feed pump is connected with the waste heat boiler with the settling chamber; the utility model discloses can avoid the problem of leaking out, improve flue gas waste heat recovery efficiency and waste heat utilization rate.
Description
Technical Field
The application belongs to the technical field of waste heat recovery and utilization in the metallurgical industry, and particularly relates to a vertical type cooling sensible heat recovery system for a sintering ore and a waste heat comprehensive utilization system thereof.
Background
According to statistics, the energy consumption of the sintering process of the iron and steel enterprises in China accounts for about 15% of the total energy consumption of the iron and steel enterprises, and is only second to the iron-making process and is on the 2 nd level. The sintering process is a process of mixing various powdery iron-containing raw materials with a certain proportion of fuel and solvent before blast furnace ironmaking production, burning the mixture on a sintering machine trolley, and sintering the mixture into blocks through a series of physical and chemical changes. The waste heat resources in the sintering process mainly comprise the sensible heat of finished sintered ore and the sensible heat of flue gas of the sintering machine. During sintering of the sinter, the sensible heat carried by the sinter before cooling is about 44.5% of the total heat expenditure.
At present, the cooling mode of the sinter is mainly organically cooled and externally cooled. The external cooling mode is that the sintering process is finished on a sintering machine and then the sintering ore is sent to an external cooler for cooling, and the external cooling mode mainly comprises a circular cooler and a belt cooler, and the cooled sintering ore is sent to a finished product screening system. Although the traditional sinter cooling mode can ensure the sufficient cooling of the sinter, the structure of the cooler body belongs to an open type, and the relative movement between the mobile trolley and the fixed fan cover makes the sealing between the mobile trolley and the fixed fan cover difficult, so that the air leakage is serious, the dust in a production field is discharged disorderly, the hot air overflows (blast cooling) or the wild air is sucked (draft cooling), the equipment is frequently damaged, the maintenance workload is large, and the self-power consumption of the cold air draft fan is high; because of difficult sealing, the waste heat recovery efficiency of the waste heat recovery system of the circular cooler equipped by part of iron and steel enterprises is low, and the power generation per ton ore is reduced year by year.
Disclosure of Invention
To the shortcoming that traditional cooler seal difficulty that exists leads to waste heat recovery utilization rate to be low among the prior art, the aim at of this application provides a vertical cooling sensible heat recovery system of sinter and waste heat comprehensive utilization system thereof.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize:
the utility model provides an upright cooling sensible heat recovery system of sinter, includes sintering system, sintering system one side is equipped with single roll crusher, single roll crusher bottom is equipped with feed system, feed system one end is connected with cooling device, the last waste heat recovery device that is connected with of cooling device, waste heat recovery device is equipped with first exhanst gas outlet, first exhanst gas outlet department is connected with dust collector, dust collector's exit has connected gradually induced air device and fume extractor.
Furthermore, a blower device is connected to the cooling device.
Further, the cooling device is a vertical cooler; the waste heat recovery device is a waste heat boiler with a settling chamber.
Further, the vertical cooler comprises a body, a feeding device is arranged at the top of the body, a central hood air distribution device and a vibration discharging device are arranged at the bottom of the body, and a second flue gas outlet and an annular air distribution opening are further formed in the body;
one end of the feeding system is connected with the feeding device; the second flue gas outlet is connected with a waste heat boiler with a settling chamber; the air blowing device is a cold air blower which comprises a first cold air blower and a second cold air blower, the first cold air blower is connected with the annular air distribution opening, and the second cold air blower is connected with the central hood air distribution device.
Furthermore, the first cold air blower is connected with the annular air distribution opening through a first pipeline, the second cold air blower is connected with the central air cap air distribution device through a second pipeline, the first pipeline is connected with the second pipeline through a third pipeline, and a cold air bypass valve is arranged on the third pipeline.
Furthermore, the bottom of the cooling device is provided with a discharging chute, the bottom of the discharging chute is provided with a cold material conveying device, and one end of the cold material conveying device is provided with a whole grain screening device.
The utility model provides a waste heat comprehensive utilization system, includes vertical cooling sensible heat recovery system of sintering deposit, from taking deposit room exhaust-heat boiler to be equipped with steam outlet, steam outlet is connected with sintering waste heat energy recovery drive device, sintering waste heat energy recovery drive device one side has connected gradually condensing equipment, condensate pump, deaerating plant and boiler feed pump, the boiler feed pump with from taking deposit room exhaust-heat boiler to be connected.
Further, the sintering waste heat energy recovery dragging device comprises a steam turbine, a speed change clutch, a driving device and a sintering main exhaust fan; the steam turbine is connected with a speed change clutch, the speed change clutch is connected with a driving device, and the driving device is connected with a sintering main exhaust fan;
the condenser device comprises a condenser and a circulating water pump, and the condenser is connected with the circulating water pump; the waste heat boiler with the settling chamber is connected with a steam turbine, the steam turbine is connected with a condenser, and the condenser is connected with a condensate pump;
the driving device is an electric motor or a motor generator.
The vertical type sintering ore cooling sensible heat recovery system comprises an induced draft fan, and the concurrent heating furnace is connected with the induced draft fan through a main flue gas pipeline and a fourth flue gas branch pipe; the second flue gas outlet is connected with a waste heat boiler with a settling chamber through a flue gas and air pipeline, the concurrent heating furnace is connected with the flue gas and air pipeline through a fifth flue gas and air branch pipe, and a flue gas bypass valve is arranged on the fifth flue gas and air branch pipe; the hot repair furnace is also connected with a gas pipeline and an air pipeline, the gas pipeline is provided with a gas valve, and the air pipeline is provided with an air blower and an air valve.
Furthermore, the vertical type cooling sensible heat recovery system for the sinter comprises a sintering machine, wherein a distributor, an igniter and a hot air hood are sequentially arranged on the sintering machine, and the induced draft fan is communicated and connected with a sintering machine table board at the distributor through a main smoke air pipeline and a first smoke air branch pipe; the induced draft fan is connected with the igniter through the main smoke and air pipeline and the second smoke and air branch pipe; the draught fan is connected with the hot air hood through the main flue gas duct and the third flue gas branch pipe.
Compared with the prior art, the beneficial effects of the utility model are as follows:
(1) the utility model discloses in arrange hot sintering deposit in inclosed vertical cooler and carry out the heat exchange cooling against the current with cooling air, its equipment structure has decided that hot sintering deposit is in airtight state all the time in whole cooling process, and the hot-blast of cooling sintering deposit can all be retrieved, and steam is not excessive, and the dust emission effectively reduces, and fundamentally has avoided the problem of leaking out.
(2) The utility model discloses well hot sintering deposit cooling time is long, the heat transfer is abundant, greatly reduced gas-material ratio in top-down motion process in vertical cooler, and gas-solid heat exchange efficiency is high, the heat carrier grade is high. The traditional circular cooler only recovers part of hot flue gas, and the waste heat recovery efficiency is low; compared with the traditional cooling mode, the vertical cooler can fully recover hot flue gas, and the waste heat recovery efficiency is high.
(3) The utility model discloses the waste heat that will sinter vertical cooling sensible heat recovery system and retrieve passes through the main air exhauster of direct coaxial drive sintering of steam turbine and motor (motor generator), has replaced original turbo generator set, has reduced the twice energy conversion that mechanical energy turned into electric energy, electric energy turned into mechanical energy, and turbo generator set improvement 6% ~ 8% of efficiency; the original steam turbine generator unit and the electric tractor main exhaust fan unit are simplified and combined, and an automatic control system, a lubricating oil system and a power oil system are combined, so that the engineering amount and the engineering investment are reduced; the same factory building is arranged in a centralized manner, so that the structure of the operation and maintenance personnel is optimized.
(4) The utility model can solve the problems of large change of sintering working conditions, large fluctuation of heat sources and the like, so that the system can run more stably, and the service life of equipment is greatly prolonged; the sintering waste heat energy recovery dragging device is flexible in arrangement, and can drive the sintering main exhaust fan together through the steam turbine and the motor (or the motor generator), so that the power consumption of the motor or the motor generator is reduced, the loss caused by energy conversion is avoided, and the energy utilization rate is improved.
(5) The utility model discloses the low temperature flue gas that well exhaust-heat boiler produced can be sent to mixture drying preheating system, sintering machine ignition combustion-supporting system, hot-blast sintering system and the combustion-supporting system of concurrent heating stove ignition respectively according to actual conditions, realizes sintering waste heat comprehensive utilization. Hot flue gas is sent to a mixture drying waste heat system, so that the air permeability of a material layer can be improved, the sintering process condition is improved, the ignition temperature of the material layer is reduced, and the ignition fuel consumption is reduced; the hot flue gas is sent to an ignition combustion-supporting system of the sintering machine, so that ignition fuel can be saved, the combustion speed and the combustion temperature are improved, and the surface layer return ore amount is reduced; the hot flue gas is sent to a hot air sintering system, so that the atmosphere of a sinter bed can be improved, solid fuel is saved, and the strength and the quality of sinter are improved; the hot flue gas is sent to the combustion-supporting system of the concurrent heating furnace to ignite, which can reduce the gas consumption and improve the combustion temperature.
Drawings
FIG. 1 is a schematic view showing the construction of a vertical cooling sensible heat recovery system for a sinter;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic view of the connection of the cold air blower;
FIG. 4 is a schematic view of the construction of the vertical cooler;
the meaning of the various reference symbols in the drawings: 1-sintering machine, 2-batching device, 3-mixing machine, 3-1-primary mixing machine, 3-2-secondary mixing machine, 4-cold air blower, 4-1-first cold air blower, 4-2-second cold air blower, 5-distributor, 6-igniter, 7-hot air hood, 8-single-roll crusher, 9-blanking chute, 10-loading trolley, 11-winding inclined bridge loading device, 12-body, 13-feeding device, 14-central hood air-distribution device, 15-vibrating discharging device, 16-discharging chute, 17-1-first pipeline, 17-2-second pipeline, 17-3-third pipeline, 18-main flue gas pipeline, 18-1-a first flue gas and air branch pipe, 18-2-a second flue gas and air branch pipe, 18-3-a third flue gas and air branch pipe, 18-4-a fourth flue gas and air branch pipe, 18-5-a fifth flue gas and air branch pipe, 18-6-a flue gas and air pipeline, 19-a first cold air valve, 20-a second cold air valve, 21-a cold air bypass valve, 22-a cold material conveying device, 23-a whole grain screening device, 24-a self-contained settling chamber waste heat boiler, 25-a steam turbine, 26-a condensing device, 26-1-a condenser, 26-2-a circulating water pump, 27-a condensed water pump, 28-a deoxidizing device, 28-1-a deaerator, 28-2-a deaerating water tank, 29-a boiler water feeding pump and 30-a variable speed clutch, 31-sintering main exhaust fan, 32-driving device, 33-vertical cooler, 34-bag-type dust remover, 35-induced draft fan, 36-smoke exhaust chimney, 37-annular air-cloth opening, 38-first smoke valve, 39-second smoke valve, 40-third smoke valve, 41-fourth smoke valve, 42-auxiliary heating furnace, 43-gas valve, 44-air blower, 45-air valve, 46-smoke bypass valve, 48-main smoke valve, 49-smoke valve and 50-second smoke outlet.
Detailed Description
As shown in fig. 1-4, the utility model provides a vertical cooling sensible heat recovery system of sintering deposit, including the sintering system, sintering system one side is equipped with single- roll crusher 8, 8 bottoms of single-roll crusher are equipped with the feeding system, feeding system one end is connected with cooling device, the last waste heat recovery device that is connected with of cooling device, waste heat recovery device is equipped with first exhanst gas outlet, first exhanst gas outlet department is connected with dust collector, dust collector's exit has connected gradually induced air device and fume extractor.
First exhanst gas outlet is used for discharging the low temperature flue gas, the utility model discloses a vertical cooler technology arranges hot sintering ore in an inclosed vertical cooler, and vertical cooler's structure has decided that hot sintering ore is in airtight state all the time in whole cooling process, has thoroughly avoided the problem of leaking out, and the hot-blast area that will cool off the sintering ore through the induced air device is retrieved to taking deposit room exhaust-heat boiler certainly, and the dust emission is few, and gas-solid heat exchange efficiency is high, waste heat utilization rate is high, and waste heat recovery effect is showing.
Specifically, the cooling device is further connected with a blowing device, the mode is combined with an air inducing device through the blowing device, the hot sinter is placed in a closed vertical cooler to be cooled by countercurrent heat exchange with cooling air, the effect of sinter cooling is achieved, and the hot air recovery of the cooled sinter is facilitated.
Specifically, the sintering system includes: the automatic feeding device comprises a batching device 2, a mixing machine 3 and a sintering machine 1, wherein a distributing device 5 and an igniter 6 are arranged on the sintering machine 1, the mixing machine 3 is connected to one side of the batching device 2, one side of the mixing machine 3 is connected with the distributing device 5, and the sintering machine 1 is connected with a single-roll crusher 8;
the feeding system comprises a blanking chute 9, a feeding trolley 10 and a hoisting inclined bridge feeding device 11; a blanking chute 9 is arranged at the bottom of the single-roll crusher 8, a feeding trolley 10 is arranged at the bottom of the blanking chute 9, and a hoisting inclined bridge feeding device 11 is connected to the bottom of the feeding trolley 10;
the cooling device is a vertical cooler 33; the waste heat recovery device is a waste heat boiler 24 with a settling chamber; the dust removing device is a bag-type dust remover 34; the air inducing device is an induced draft fan 35; the fume extractor is a fume chimney 36; one end of the hoisting inclined bridge feeding device 11 is connected with the vertical cooler 33;
in the mode, the waste heat boiler 24 with the settling chamber comprises the settling chamber and a waste heat boiler, wherein the settling chamber is used for primarily removing large particle dust in high-temperature flue gas, and the waste heat boiler exchanges heat with the high-temperature flue gas after dust removal; the bag-type dust collector is used for carrying out secondary dust collection on the flue gas and filtering small-particle dust in the flue gas so as to reach the national emission standard; the induced draft fan 35 adopts a negative pressure air draft mode, and sends air into the vertical cooler 33 together with the first cold air blower 4-1 and the second cold air blower 4-2, and discharges low-temperature flue gas passing through the bag-type dust collector 34.
Specifically, the bottom of the cooling device is provided with a discharging chute 16, the bottom of the discharging chute 16 is provided with a cold material conveying device 22, and one side of the cold material conveying device 22 is provided with a whole grain screening device 23. In this mode the discharge chute 16 is used for the transfer and temporary storage of cooled sinter; the cold material conveying device 22 is used for conveying cooled sinter; the whole grain screening device 23 is used for screening the cooled sintering ore according to the particle size distribution condition, and returning the sintering ore material smaller than 5mm to the batching device 2 for batching and sintering again; returning the sintered ore material of 10-20 mm to a 1 trolley of the sintering machine as a bedding material; the sintering ore with the rest granularity is taken as qualified finished sintering ore and sent to a blast furnace for smelting;
specifically, the vertical cooler 33 comprises a body 12, the top of the body 12 is provided with a feeding device 13, the bottom of the body 12 is respectively provided with a central hood air distribution device 14 and a vibration discharging device 15, and the body 12 is further provided with a second flue gas outlet 50 and an annular air distribution opening 37;
one end of the hoisting inclined bridge feeding system 11 is connected with a feeding device 13; the second flue gas outlet 50 is connected with the waste heat boiler 24 with the settling chamber; the air blowing device is a cold air blower 4, the cold air blower 4 comprises a first cold air blower 4-1 and a second cold air blower 4-2, the first cold air blower 4-1 is connected with the annular air distribution opening 37, and the second cold air blower 4-2 is connected with the central hood air distribution device 14. In the mode, the vertical cooler 33 cools the hot sintering ore through the combined action of the first cold air blower 4-1, the second cold air blower 4-2 and the induced draft fan 35, and the second flue gas outlet 50 is used for discharging high-temperature flue gas.
Specifically, a first cold air valve 19 is arranged on one side of the first cold air blower 4-1; a second cold air valve 20 is arranged on one side of the second cold air blower 4-2; the first cold air blower 4-1 is connected with the annular air distribution opening 37 through a first pipeline 17-1, the second cold air blower 4-2 is connected with the central hood air distribution device 14 through a second pipeline 17-2, the first pipeline 17-1 is connected with the second pipeline 17-2 through a third pipeline 17-3, and the third pipeline 17-3 is provided with a cold air bypass valve 21. In this way, the first cold air blower 4-1 and the second cold air blower 4-2 work independently and are mutually standby, if one cold air blower fails, the cold air bypass valve 21 can be opened to adjust the air volume of the central hood air distribution device 14 and the annular air distribution port 37, and the cooling of the hot sinter is not affected.
Specifically, mix machine 3 and include first mix machine 3-1 and second and mix machine 3-2, first mix machine 3-1 one side and be connected with dosing unit 2, first mix machine 3-1 opposite side and mix machine 3-2 with the second and be connected, second mix machine 3-2 one side and be connected with distributing device 5. The batching device 2 adopts the same device as the batching device in the prior art; the hoisting inclined bridge feeding device 11 is the same as the hoisting inclined bridge feeding device 11 in the prior art; the whole grain screening device 23 is the same device as the whole grain screening device in the prior art.
In order to improve the yield and quality of the sintering ore and reduce the fuel consumption, the sintering raw materials need to be proportioned, and the batching device 2 is used for batching various sintering materials (iron-containing raw materials, solvents, fuels and the like) according to a certain proportion; the first mixer 3-1 is used for adding water to the prepared sintering raw materials of each layer for wetting and uniformly mixing; the second mixer 3-2 is used for continuously mixing and pelletizing the prepared sintering raw materials of each layer, so that the components of the reinforced sintering material are uniform, the consistency of physical and chemical properties in the sintering process is ensured, the air permeability of the mixture in the sintering process is improved, and the finished sintering ore with high yield, high quality and low consumption is obtained; the distributing device 5 is used for flatly paving the mixture on a trolley of the sintering machine 1; the igniter 6 adopts coal gas and smoke as ignition fuel, supplies enough heat to the surface of the mixture, and ignites and burns the solid fuel in the mixture; the sintering machine 1 is used for starting sintering after distributing and igniting the mixture, the mixture is propelled on a trolley of the sintering machine at a constant speed, and a sintering material layer generates a series of physical and chemical changes from top to bottom under the action of forced air draft of a main sintering exhaust fan 31 to form sinter; the single-roll crusher 8 is used for crushing hot sintering ore cakes discharged from the sintering machine 1; the blanking chute is used for transferring and temporarily storing the crushed hot sintering ore with the thickness of 0-150 mm; the feeding trolley 10 sends the hot sintering ore falling from the blanking chute to a vertical cooler 33 through a hoisting inclined bridge feeding device 11;
the utility model also provides an adopt vertical cooling sensible heat recovery system's of sintering deposit waste heat comprehensive utilization system, include vertical cooling sensible heat recovery system of sintering deposit, be equipped with steam outlet from taking deposit room exhaust-heat boiler 24, steam outlet is connected with sintering waste heat energy recovery drive device, sintering waste heat energy recovery drive device one side is connected with condensing unit 26, condensing unit 26 one side is connected with condensate pump 27, condensate pump 27 one side is connected with deaerating unit 28, deaerating unit 28 one side is connected with boiler feed pump 29, boiler feed pump 29 with take deposit room exhaust-heat boiler 24 to be connected.
In the mode, the waste heat boiler 24 with the settling chamber can adopt a single-pressure or double-pressure mode, and when the single-pressure waste heat boiler with the settling chamber is adopted, only superheated steam with one parameter is generated and sent to the steam turbine 25 to do work; when a double-pressure waste heat boiler with a settling chamber is adopted, the generated high-parameter superheated steam is taken as main steam and sent to a main steam inlet of the steam turbine 25, and the generated low-parameter steam is taken as supplementary steam and sent to a supplementary steam inlet of the steam turbine 25; the condensing device 26 is used for condensing the exhaust steam discharged from the sintering waste heat energy recovery dragging device into water; the oxygen removal device 28 is used to remove oxygen and other gases dissolved in the feed water.
Specifically, the sintering waste heat energy recovery dragging device comprises a steam turbine 25, a speed change clutch 30, a driving device 32 and a sintering main exhaust fan 31; the arrangement type of the sintering waste heat energy recovery dragging device is as follows: the steam turbine 25 is connected with a speed change clutch 30, the speed change clutch 30 is connected with a driving device 32, and the driving device 32 is connected with a sintering main exhaust fan 31;
the condenser device 26 comprises a condenser 26-1 and a circulating water pump 26-2, and one side of the condenser 26-1 is connected with the circulating water pump 26-2; one side of the waste heat boiler 24 with the settling chamber is connected with a steam turbine 25, one side of the steam turbine 25 is connected with a condenser 26-1, and the condenser 26-1 is connected with a condensate pump 27; the driving device 32 is a motor or a motor generator; the sintering main exhaust fan 31 is connected with the sintering machine 1.
In the mode, steam generated by a waste heat boiler 24 with a settling chamber drives a steam turbine 25 to rotate, and the heat energy of the steam is converted into mechanical energy; the condenser 26-1 condenses the exhaust steam discharged from the steam turbine 25 into water by the water provided by the circulating water pump 26-2; the deoxygenation water tank 28-2 is supplementing water in a pipeline; the deaerator 28-1 is used for filtering oxygen and other gases dissolved in the feed water; the boiler feed water pump 29 is used for delivering the water deoxidized by the deaerator 28-1 to the waste heat boiler 24 with the settling chamber; the speed change clutch 30 has the functions of speed change and clutch, and the speed change clutch 30 can transmit the mechanical energy of the steam turbine 25 to the motors (or motor generators) with different rotating speeds and the sintering main exhaust fan 31 through big and small gears; when the steam generated by the waste heat boiler 24 with the settling chamber is sent to the steam turbine 25 to be accelerated and the input rotating speed of the steam turbine 25 reaches the output rotating speed of the speed change clutch 30, the speed change clutch 30 is automatically engaged, and at the moment, the steam turbine 25 and the driving device 32 jointly drive the sintering main exhaust fan, so that the functions of efficient energy conversion and on-site utilization are realized.
The sintering waste heat energy recovery dragging device can adapt to the problem of large change of sintering working conditions, when the steam sent to the steam turbine 25 is rich, namely the steam generated by the vertical sinter cooler sensible heat recovery system is sent to the steam turbine 25 to obtain active power which is greater than the rated power of the main sintering exhaust fan 31, and the active power can drive a motor generator to generate power and reversely send power to a power grid; when the steam turbine 25 breaks down and needs to be stopped for maintenance, the rotating speed of the steam turbine 25 is reduced, and the sintering main exhaust fan 31 is dragged by the motor, so that the sintering production process is not influenced; the utility model discloses can be through steam turbine 25 and the main air exhauster 31 of the direct coaxial drive sintering of drive arrangement 32, replaced original turbo generator set, reduced mechanical energy and turned into electric energy, electric energy transformation twice energy conversion of mechanical energy, greatly reduced motor or motor generator's consumption, the loss of avoiding energy conversion to bring has improved energy utilization.
According to the difference of the field conditions, the sintering waste heat energy recovery dragging device can also select different arrangement types, which specifically are as follows: one side of the steam turbine 25 is connected with a speed change clutch 30, one side of the speed change clutch 30 is connected with a sintering main exhaust fan 31, and one side of the sintering main exhaust fan 31 is connected with a driving device 32;
specifically, the system also comprises a heat-supplementing furnace 42, wherein the heat-supplementing furnace 42 is connected with the induced draft fan 35 through the main flue gas pipeline 18 and the fourth flue gas branch pipe 18-4; the second flue gas outlet 50 is connected with the waste heat boiler 24 with the settling chamber through a flue gas and air pipeline 18-6, one side of the concurrent heating furnace 42 is connected with the flue gas and air pipeline 18-6 through a fifth flue gas and air branch pipe 18-5, and a flue gas bypass valve 46 is arranged on the fifth flue gas and air branch pipe 18-5; the other side of the concurrent heating furnace 42 is respectively connected with a gas pipeline and an air pipeline, the gas pipeline is provided with a gas valve 43, and the air pipeline is provided with an air blower 44 and an air valve 45.
In this mode, the gas pipeline provides gas fuel for the holding furnace 42; the air blower 44 provides oxygen with a certain pressure and flow rate for the reheating furnace 42; the heat supplementing furnace 42 can supplement heat for the waste heat boiler 24 with the settling chamber, and effectively reduces the damage of heat source fluctuation to the waste heat boiler 24 with the settling chamber and the steam turbine 25; the induced draft fan 35 and the concurrent heating furnace 42 are communicated and connected to form an concurrent heating furnace ignition combustion-supporting system, hot flue gas is delivered to the concurrent heating furnace ignition combustion-supporting system, coal gas consumption can be reduced, and combustion temperature is increased; the ignition combustion-supporting system of the concurrent heating furnace is an independent system and can be set according to the actual conditions of projects;
specifically, a smoke valve 49 is arranged between the induced draft fan 35 and the smoke exhaust chimney 36, a hot air smoke hood 7 is arranged on the sintering machine 1, and the induced draft fan 35 is communicated and connected with the table top of the sintering machine 1 on one side of the distributing device 5 through a main smoke pipeline 18 and a first smoke branch pipe 18-1; the induced draft fan 35 is connected with the igniter 6 through the main flue gas duct 18 and the second flue gas branch pipe 18-2; the induced draft fan 35 is connected with the hot air hood 7 through the main flue gas duct 18 and the third flue gas branch pipe 18-3; a main flue gas valve 48 is arranged on the main flue gas pipeline 18; the first flue gas and air valve 38 is arranged on the first flue gas and air branch pipe 18-1, the first flue gas and air valve 39 is arranged on the second flue gas and air branch pipe 18-2, and the third flue gas and air valve 40 is arranged on the third flue gas and air branch pipe 18-3.
In the mode, the induced draft fan 35 is communicated and connected with the table top of the sintering machine 1 behind the distributing device 5 to form a mixture drying waste heat system, hot flue gas is sent to the mixture drying waste heat system, so that the air permeability of a material layer can be improved, the sintering process condition is improved, the ignition temperature of the material layer is reduced, and the ignition fuel consumption is reduced; the induced draft fan 35 is communicated with the igniter 6 to form an ignition combustion-supporting system of the sintering machine, hot flue gas is delivered to the ignition combustion-supporting system of the sintering machine, ignition fuel can be saved, the combustion speed and the combustion temperature are improved, and the surface layer return ore amount is reduced; the induced draft fan 35 is communicated with the hot air hood 7 to form a hot air sintering system, hot flue gas is delivered to the hot air sintering system, the atmosphere of a sinter bed can be improved, solid fuel is saved, and the strength and the quality of sinter are improved; the mixture drying and preheating system, the ignition combustion-supporting system of the sintering machine and the hot air sintering system are relatively independent systems and can be set according to the actual conditions of projects.
The utility model discloses a theory of operation:
mixing various sintering materials (iron-containing raw materials, solvents, fuels and the like) together according to a certain proportion in a proportioning device 2, wetting the various sintering materials by adding water and uniformly mixing by using a first mixer 3-1, continuously mixing the various sintering materials by using a second mixer 3-2, and pelletizing to generate a mixture; the mixture is sent to a distributing device 5, the mixture is flatly paved on a trolley of the sintering machine 1 through the distributing device 5, and after being ignited by an igniter 6, the mixture is propelled at a constant speed for sintering; the sintered hot sintering ore is sent to a single-roller crusher 8 to be crushed into hot sintering ore with the particle size of 0-150 mm, the hot sintering ore is sent to a feeding trolley 10 through a blanking chute 9, and the feeding trolley 10 is sent to a feeding device 13 through a hoisting inclined bridge feeding system 11; at the moment, the first cold air valve 19 and the second cold air valve 20 are opened, the hot sintered ore moves from top to bottom in the body 12 of the vertical cooler 33, and under the blowing action of the first cold air blower 4-1 and the second cold air blower 4-2 and the air draft action of the induced draft fan 35, cooling air enters the vertical cooler 33 from the central hood air distribution device 14 and the annular air distribution opening 37 and moves from bottom to top; the heat sintering ore from top to bottom and the cooling air from bottom to top carry out countercurrent heat exchange in the body 12 of the vertical cooler 33, the generated high-temperature hot flue gas is sent to the waste heat boiler 24 with a settling chamber for primary dust removal and heat exchange through the second flue gas outlet 50, and the flue gas after heat exchange is dedusted again through the bag-type dust remover to reach the national emission standard;
according to the actual requirement, one or more of the main smoke valve 48, the first smoke valve 38, the second smoke valve 39, the third smoke valve 40, the fourth smoke valve 41 and the cold air bypass valve 21 are opened, the smoke valve 49 is closed, and the smoke passing through the induced draft fan 35 is sent to the comprehensive waste heat utilization system; or the smoke valve 49 is opened to discharge the smoke through the smoke exhaust chimney 36; and discharging the low-temperature sintered ore generated after heat exchange through vibration of the vibration discharging device 15, and sequentially conveying the low-temperature sintered ore to the discharging chute 16 and the cold material conveying device 22, wherein the cold material conveying device 22 conveys the low-temperature sintered ore to the whole grain screening device 23 for screening.
The high-temperature hot flue gas is subjected to primary dust removal and heat exchange in a waste heat boiler 24 with a settling chamber, high-parameter superheated steam is generated and sent to a main steam inlet of a steam turbine 25 as main steam, and low-parameter steam is sent to a steam supplementing inlet of the steam turbine 25 as supplementing steam; the rotating speed of the steam turbine is increased to the meshing rotating speed, and the steam turbine is meshed with the sintering main exhaust fan 31 and a motor (or a motor generator) to jointly drive the sintering main exhaust fan 31 to work; when the steam sent to the steam turbine 25 is rich, the motor generator is driven to generate electricity; when the steam turbine 25 breaks down and needs to be stopped for maintenance, the rotating speed of the steam turbine 25 is reduced, the speed change clutch 30 is automatically disengaged, and the sintering main exhaust fan 31 is dragged by the motor, so that the sintering production process is not influenced.
Meanwhile, the exhaust steam generated by the work of the steam turbine 25 is sent to a condenser 26-1 to exchange heat with circulating water flowing in by a circulating water pump 26-2, the exhaust steam is condensed into water, the condensed water is sent to a deaerator 28-1 to be deaerated under the action of a condensed water pump 27, and then is sent to a waste heat boiler 24-1 with a settling chamber by a boiler water feeding pump 29 to complete thermodynamic cycle, and meanwhile, water is sent to a deaerating water tank 28-2 from an external desalted water station to replenish water for the deaerator 28-1 and a pipeline where the waste heat boiler 24 with the settling chamber is located.
Claims (7)
1. A vertical type cooling sensible heat recovery system for sinter comprises a sintering system, wherein a single-roller crusher (8) is arranged on one side of the sintering system, a feeding system is arranged at the bottom of the single-roller crusher (8), and the vertical type cooling sensible heat recovery system is characterized in that,
one end of the feeding system is connected with a cooling device, the cooling device is connected with a waste heat recovery device, the waste heat recovery device is provided with a first flue gas outlet, the first flue gas outlet is connected with a dust removal device, the outlet of the dust removal device is sequentially connected with an air inducing device and a smoke exhaust device, the cooling device is also connected with an air blowing device, the cooling device is a vertical cooler (33), and the waste heat recovery device is a waste heat boiler (24) with a settling chamber;
the vertical cooler (33) comprises a body (12), a feeding device (13) is arranged at the top of the body (12), a central hood air distribution device (14) and a vibration discharging device (15) are arranged at the bottom of the body (12), and a second flue gas outlet (50) and an annular air distribution opening (37) are further arranged on the body (12);
one end of the feeding system is connected with a feeding device (13); the second flue gas outlet (50) is connected with a waste heat boiler (24) with a settling chamber; the air blowing device is a cold air blower (4), the cold air blower (4) comprises a first cold air blower (4-1) and a second cold air blower (4-2), the first cold air blower (4-1) is connected with the annular air distribution opening (37), and the second cold air blower (4-2) is connected with the central hood air distribution device (14).
2. The vertical sinter cooling sensible heat recovery system according to claim 1, wherein the first cold air blower (4-1) is connected to the annular air distribution port (37) through a first pipe (17-1), the second cold air blower (4-2) is connected to the central hood air distribution device (14) through a second pipe (17-2), the first pipe (17-1) is connected to the second pipe (17-2) through a third pipe (17-3), and a cold air bypass valve (21) is provided on the third pipe (17-3).
3. The vertical sinter cooling sensible heat recovery system according to claim 2, wherein a discharge chute (16) is provided at the bottom of the cooling device, a cold material conveying device (22) is provided at the bottom of the discharge chute (16), and a whole grain screening device (23) is provided at one end of the cold material conveying device (22).
4. The utility model provides a waste heat comprehensive utilization system, its characterized in that includes the vertical cooling sensible heat recovery system of sintering deposit of claim 1, from taking deposit room exhaust-heat boiler (24) to be equipped with steam outlet, steam outlet is connected with sintering waste heat energy recovery drive device, sintering waste heat energy recovery drive device one side has connected gradually condensing equipment (26), condensate pump (27), deaerating plant (28) and boiler feed water pump (29), boiler feed water pump (29) with from taking deposit room exhaust-heat boiler (24) to be connected.
5. The comprehensive waste heat utilization system according to claim 4, wherein the sintering waste heat energy recovery dragging device comprises a steam turbine (25), a speed change clutch (30), a driving device (32) and a sintering main exhaust fan (31); the steam turbine (25) is connected with a speed change clutch (30), the speed change clutch (30) is connected with a driving device (32), and the driving device (32) is connected with a sintering main exhaust fan (31);
the condenser device (26) comprises a condenser (26-1) and a circulating water pump (26-2), and the condenser (26-1) is connected with the circulating water pump (26-2); the waste heat boiler (24) with the settling chamber is connected with a steam turbine (25), the steam turbine (25) is connected with a condenser (26-1), and the condenser (26-1) is connected with a condensate pump (27);
the drive device (32) is an electric motor or a motor generator.
6. The comprehensive waste heat utilization system of claim 5, further comprising an auxiliary furnace (42), wherein the vertical sinter cooling sensible heat recovery system comprises an induced draft fan (35), and the auxiliary furnace (42) is connected with the induced draft fan (35) through a main flue gas pipeline (18) and a fourth flue gas branch pipe (18-4); the second flue gas outlet (50) is connected with a waste heat boiler (24) with a settling chamber through a flue gas and air pipeline (18-6), the concurrent heating furnace (42) is connected with the flue gas and air pipeline (18-6) through a fifth flue gas and air branch pipe (18-5), and a flue gas bypass valve (46) is arranged on the fifth flue gas and air branch pipe (18-5); the concurrent heating furnace (42) is also connected with a gas pipeline and an air pipeline, the gas pipeline is provided with a gas valve (43), and the air pipeline is provided with an air blower (44) and an air valve (45).
7. The comprehensive waste heat utilization system of claim 6, wherein the vertical-type cooling sensible heat recovery system of the sinter comprises a sintering machine (1), a distributor (5), an igniter (6) and a hot air hood (7) are sequentially arranged on the sintering machine (1), and the induced draft fan (35) is communicated and connected with the table top of the sintering machine (1) at the distributor (5) through a main flue gas pipeline (18) and a first flue gas branch pipe (18-1); the induced draft fan (35) is connected with the igniter (6) through the main flue gas duct (18) and the second flue gas branch pipe (18-2); the draught fan (35) is connected with the hot air hood (7) through the main flue gas duct (18) and the third flue gas branch pipe (18-3).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322536A (en) * | 2020-09-30 | 2022-04-12 | 江苏鑫浩新材料科技有限公司 | Belt type ceramsite sintering machine and belt type ceramsite sintering method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114322536A (en) * | 2020-09-30 | 2022-04-12 | 江苏鑫浩新材料科技有限公司 | Belt type ceramsite sintering machine and belt type ceramsite sintering method |
| CN114322536B (en) * | 2020-09-30 | 2023-11-03 | 江苏鑫浩新材料科技有限公司 | Belt type ceramsite sintering machine and belt type ceramsite sintering method |
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