CN220450262U

CN220450262U - Sintering machine-shaft furnace pellet roasting system

Info

Publication number: CN220450262U
Application number: CN202321767190.0U
Authority: CN
Inventors: 潘春强; 程广忠; 陈月; 宋薇; 潘福宇; 李忠伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-07-06
Filing date: 2023-07-06
Publication date: 2024-02-06
Anticipated expiration: 2033-07-06

Abstract

The utility model relates to a sintering machine-shaft furnace pellet roasting system, in particular to the technical field of pellet production in the steel industry. The upper part of the sintering machine is provided with a sealing cover, the sealing cover above the sintering machine is divided into a drying section, a preheating section and a preheating section in sequence according to the trend of materials, a discharge hole of the sintering machine is connected with a feed inlet of a shaft furnace, roasting, soaking and cooling are all completed on the shaft furnace, pellets are dried and preheated by utilizing waste heat of waste gas through a backhot air system, the pellets after drying and preheating treatment directly enter the shaft furnace, and the temperature of the pellets entering the shaft furnace is 650-750 ℃. The utility model mainly develops a new pellet roasting system based on the existing sintering machine, reasonably utilizes the waste small-sized sintering machine to produce pellets, has small occupied area, high waste heat utilization rate, reduces energy consumption, improves resource utilization rate, reduces pellet roasting equipment investment cost, improves economic benefit and protects environment.

Description

Sintering machine-shaft furnace pellet roasting system

Technical Field

The utility model relates to a pellet roasting device, in particular to a sintering machine-shaft furnace pellet roasting system, and belongs to the technical field of pellet production in the steel industry.

Background

At present, the main process for producing the oxidized pellet comprises the following steps: shaft furnace roasting method, belt machine roasting method, grate-rotary kiln-circular cooler roasting method.

The pellet production process is a production process for refining pellets, and the pellets are a common process for refining iron ores in the steel smelting industry. The pellet is prepared by mixing finely ground iron concentrate powder or other iron-containing powder with a small amount of additive, rolling into balls by a pelletizer under the condition of being wetted by adding water, drying and roasting, and solidifying to obtain the spherical iron-containing raw material with certain strength and metallurgical properties.

Along with the national adjustment of environmental protection and steel productivity, more and more waste small sintering machines face the dilemma of eliminating and stopping use, and meanwhile, along with iron making, the demand for pellets is also increasing. If the small-sized sintering machine is transformed into the equipment for producing pellets, the cost of the equipment for roasting pellets can be reduced, the requirements of enterprises on the pellets can be met, and the resource utilization rate and the economic benefit are improved. However, if the sintering machine is simply and directly adopted to produce pellets, the production of qualified pellets cannot be realized, so that a sintering machine-shaft furnace sintering pellet system is developed based on the existing waste small-sized sintering machine, the current technical problems are solved, the investment cost is reduced, and the resource utilization rate is improved.

A novel sintering machine roasting system (CN 202221109073.0) patent technology for pellets; the technology is characterized in that a sintering machine is improved, drying, preheating, roasting, soaking and primary cooling are arranged on the sintering machine, and final cooling is arranged on an annular cooler, so that the technology has no problem in producing pellets, but the sintering machine is changed greatly, roasting and soaking are carried out on the sintering machine, and in order to ensure the roasting quality of the pellets, the temperature is generally about 1100 ℃, so that a roasting section and a soaking section bellows are required to be replaced by a new bellows with refractory materials arranged inside; the sealing smoke hood of the upper roasting section and the soaking section of the sintering machine needs to adopt various special-shaped refractory materials with high temperature resistance, so that the refractory materials are complex in quality; the sintering trolley is required to be transformed or replaced by adopting a high-temperature-resistant alloy steel material; the annular cooler is adopted to cool the air leakage rate (30% -40%), the cold air utilization efficiency is low, the energy consumption is high, and a large amount of dust leakage exists in the operation process to pollute the environment; when the waste heat is recovered and utilized, the worse the cold action of the ring cooler is, the lower the waste heat recovery rate is, so the investment for reforming the sintering machine and the ring cooler in the technology is higher.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides a sintering machine-shaft furnace pellet roasting system, and aims to provide a sintering machine-shaft furnace pellet roasting system which has the advantages of small occupied area, high residual heat utilization rate, low energy consumption, simple equipment, no special requirements on equipment structure materials, convenient operation and maintenance, high thermal efficiency and low pellet roasting equipment investment cost; the roasting system reasonably utilizes the waste small-sized sintering machine to produce the pellets, reduces the investment cost of pellet roasting equipment, improves the resource utilization rate and the economic benefit, and protects the environment.

According to an embodiment of the present utility model, a sintering machine-shaft furnace pellet firing system is provided.

A sintering machine-shaft furnace pellet roasting system comprises a sintering machine and a shaft furnace. The sealing hood above the sintering machine is divided into a first drying section, a second drying section, a first preheating section and a second preheating section in sequence according to the trend of materials, a tail sealing cover is arranged behind the tail of the sintering machine, and a discharge port at the lower end of the tail sealing cover is connected with a feed port of the shaft furnace; the shaft furnace is divided into a roasting section, a soaking section and a cooling section from the lower part of the feed inlet at one time, and roasting, soaking and cooling are completed on the shaft furnace.

In the utility model, a wind box is arranged at the lower part of a sintering machine, a hot air return large flue is arranged below a wind box of a preheating section, the hot air return large flue is connected with each wind box of the preheating section through a hot air return connecting pipeline of each wind box, hot flue gas after preheating a first section and preheating a second section of preheating pellets is collected into the hot air return large flue through each wind box and each hot air return connecting pipeline, the hot air return large flue is connected with a No. 1 hot air return inlet through a No. 1 hot air return inlet pipeline, the No. 1 hot flue gas is pumped out of each wind box at the bottom of the preheating section by a No. 1 hot air return fan, the hot flue gas is conveyed to a drying section through a No. 1 hot air return outlet pipeline, the No. 1 hot air return outlet pipeline is divided into two branches to be respectively introduced before entering a drying section and a drying section of sealing fume hood, a hot air return branch pipeline-1 enters a drying section, a hot air return branch pipeline-2 enters a drying section, and a regulating valve is arranged on the hot air branch pipeline to control the amount of the flue gas entering the drying section and the drying section; and regulating valves are arranged on the backheating air connecting pipelines connected with the bellows if necessary to control the ventilation quantity on the connecting pipelines and the pressure in the bellows.

The lower part of the sintering machine is provided with an air box, a dust removing large flue is arranged below the air box of the drying section and is connected with the air boxes of the drying section through various dust removing connecting pipelines, waste flue gas after drying the first section and the second section of drying pellets is collected into the dust removing large flue through the various air boxes of the drying section and the various dust removing connecting pipelines, the dust removing large flue is connected with a dust remover, a dust removing induced draft fan and a desulfurization and denitrification device through the dust removing pipelines, and the dust removing induced draft fan is used for treating the dust removed flue gas through the desulfurization and denitrification device and delivering the dust removed flue gas to an emptying chimney for safe discharge after reaching standards. The dust remover can adopt electric dust removal or cloth bag dust removal, and the dust removal connecting pipelines connected with the air boxes are provided with regulating valves if necessary, so that the flue gas amount to the dust removal large flue and the pressure in the air boxes can be controlled through mutual adjustment.

In the utility model, the shaft furnace comprises a shaft furnace body, a combustion chamber, a burner, a cooling fan, a tooth roller discharger, a lower hopper, an electric vibration feeder and conveying equipment; the two sides of the shaft furnace are provided with combustion chambers, two ends of each combustion chamber are provided with combustor mounting holes, a combustor outlet is arranged on the mounting holes at the end parts of the combustion chambers, and a combustion air pipeline and a gas pipeline are arranged at the combustor inlet; the cooling fans are arranged on two sides of the furnace body and are connected with the furnace body through cold air pipelines, and the cold air pipelines are arranged at the cooling section; the tooth roller discharger is arranged at the lower part of the cooling section, so that the pellets uniformly fall into a lower hopper, and the lower hopper continuously falls into conveying equipment through an electric vibration feeder, and is conveyed to a finished product area through the conveying equipment; the lower conveying equipment of the electric vibration feeder can adopt a heat-resistant conveying belt conveyor, a belt cooler for conveying and a chain plate machine.

In the utility model, high-temperature flue gas in the shaft furnace is pumped out through a regenerative air pipeline No. 1 and a regenerative air pipeline No. 2 which are connected with a furnace body, the regenerative air pipeline No. 1 and the regenerative air pipeline No. 2 are connected with a regenerative fan inlet pipeline No. 2, a regenerative fan outlet pipeline No. 2 is connected with a regenerative fan outlet of No. 2, the high-temperature flue gas conveys high-temperature hot air to a preheating section through a regenerative fan outlet pipeline No. 2, the regenerative fan outlet pipeline No. 2 is divided into two branches to respectively enter before entering a preheating section and a preheating section sealing smoke hood, a regenerative air branch pipeline-3 enters a preheating section, a regenerative air branch pipeline-4 enters a preheating section, and a regulating valve is arranged on the branch pipeline to control the flue gas quantity entering the preheating section and the preheating section.

In the utility model, the system also comprises a bedding material distributing device and a green ball distributing device; according to the trend of the materials, the bedding material distributing device and the green ball distributing device are sequentially arranged above the feeding end of the sintering machine, and the green ball distributing device drops unqualified materials on the return belt for returning.

The using method of the sintering machine-shaft furnace pellet roasting system is as follows: the bedding material distributing device firstly lays finished pellets on the sintering machine, and then the green pellets are arranged on the bedding material by the green pellet distributing device. The sintering machine slowly rotates to drive the materials to sequentially enter a first drying section, a second drying section, a first preheating section and a second preheating section, pellets after being preheated by the drying section and the preheating section directly enter a shaft furnace, and the temperature of the pellets entering the shaft furnace is about 650-750 ℃; the roasting, soaking and cooling are completed in the shaft furnace, the cooled pellets are discharged from the hopper, the discharging temperature is generally 100-200 ℃, and the pellets are conveyed to a finished product area through conveying equipment.

At present, along with the national adjustment of environmental protection and steel productivity, more and more waste small sintering machines face the dilemma of eliminating and stopping use, and meanwhile, along with the iron making, the demand for pellets is also increasing. The utility model adopts a sintering machine-shaft furnace combined pellet roasting system, pellets are dried and preheated on a sintering machine trolley and then enter the shaft furnace to finish roasting, soaking and cooling. The roasting system reasonably utilizes the waste small-sized sintering machine to produce the pellets, reduces the investment cost of pellet roasting equipment, improves the resource utilization rate and the economic benefit, and protects the environment.

In the utility model, a general sintering machine mainly comprises a head wheel and a driving device, a head framework and a head sealing cover, a head bent rail, a distributing device, a trolley, an igniter, a middle framework, a bellows, a slideway and a seal, a trolley travelling rail, a tail wheel and a tail moving frame, a tail chute and a tail sealing cover, and other auxiliary supporting facilities. The utility model is characterized in that the utility model is dried and preheated on a sintering machine, and baked, soaked and cooled on a shaft furnace, so that an igniter at the upper part of the original sintering machine is only required to be dismantled, and then a sealing smoke hood is arranged on the sintering machine and is divided into a drying section and a preheating section according to the trend of materials; the original devices, facilities and the like matched with the sintering machine can be used continuously, so that the utilization rate of the facilities is greatly improved, the cost of new investment equipment is reduced, and the economic benefit is improved; because the sintering machine is only used for drying and preheating pellets, the using temperature is relatively low, the refractory materials in each section of sealed fume hood can be refractory ceramic fiber board, and the sintering machine has the advantages of small heat conductivity and low heat capacity; the thermal shock resistance, corrosion resistance and thermal stability are good; good machining performance; the use temperature is high, and the flame can be directly contacted; the pressure resistance is high, and the service life is long; the installation and the use are convenient, etc.; in order to prevent corrosion during smoke circulation, a layer of wear-resistant and high-temperature-resistant spray paint can be sprayed on the surface of the kiln, meanwhile, due to the fact that the density of the kiln hood is relatively low, the material specification of the sealed smoke hood and a rack can be reduced, compared with a belt type roasting machine, the weight of the sealed smoke hood and the rack in a drying section and a preheating section is reduced, and investment cost is reduced.

In the utility model, a vertical furnace is arranged at the lower end of a discharging hole of a sealing cover at the tail part of a sintering machine, the discharging hole at the lower end of the sealing cover at the tail part of the sintering machine is connected with a feeding hole of the vertical furnace, pellets after being preheated by a drying section and a preheating section directly enter the vertical furnace, the temperature of the pellets entering the vertical furnace is about 650-750 ℃, the baking, soaking and cooling are completed in the vertical furnace, the cooled pellets are discharged from a hopper and are transported to a finished product area by a conveying device; the shaft furnace is adopted to bake the pellets, so that the device is simple, the maintenance operation is convenient, the heat efficiency is high, the furnace body structure has no special requirements on materials, and the overall cost is low; and the original circular cooler is removed, the shaft furnace is arranged, the occupied area is reduced, and the space utilization rate is improved.

In the utility model, the system also comprises a bedding material distributing device and a green ball distributing device. The device comprises a material spreading device, a raw ball distributing device, a first drying section, a second drying section, a first preheating section and a second preheating section, wherein the material spreading device and the raw ball distributing device are sequentially arranged above a material feeding end of a sintering machine, according to the trend of materials, the dried and preheated pellets directly fall into a shaft furnace, the raw balls are dried in the first drying section and the second drying section by air suction, the raw balls are preheated by air suction in the first preheating section and the second preheating section, and the hot flue gas entering a sealed smoke hood passes through a material layer and enters a bellows at the lower part of a trolley to be extracted; according to the utility model, the finished ball bedding material is adopted, firstly, the air permeability of the material layer is improved, secondly, the temperature of hot air passing through the material layer and reaching the grid plate of the sintering machine trolley is reduced, the sintering machine trolley is protected, and the service life is prolonged. The drying section and the preheating section all adopt an air draft mode, so that negative pressure can be ensured in the bellows and the sealing smoke hood all the time, and dust leakage is avoided to pollute the working environment.

The utility model can realize that the stroke system only has one inlet and one outlet in the whole roasting process, reduces the discharge point, improves the heat utilization rate by recycling, reduces the energy consumption and reduces the environmental pollution. In addition, the multiple branch pipeline regulating valves can realize the real-time regulation of the flue gas quantity and improve the yield of pellets.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model develops a sintering-shaft furnace pellet roasting system based on the existing waste small-sized sintering machine, on one hand, the waste small-sized sintering machine is reasonably utilized to produce pellets, the resource utilization rate is improved, and on the other hand, the investment cost of pellet roasting equipment is reduced, so that the utility model has good economic and social benefits.

2. The pellets are stationary on the sintering machine trolley and slowly move forwards under the driving action, and are uniformly distributed by the distribution device, so that continuous operation can be realized, and the productivity of the shaft furnace is improved. The utility model is suitable for treating common iron ore concentrate, vanadium titano-magnetite, hematite concentrate and chromite concentrate.

3. Compared with a belt type machine roasting method and a novel pellet sintering machine roasting system, the utility model combines a sintering machine with a shaft furnace to roast pellets, and the sintering machine has low use temperature, so that the device and the facility which are almost matched with the sintering machine can be continuously used, the transformation range is small, the investment is reduced, the productivity is increased, and the production efficiency is improved.

4. Compared with a roasting method of a grate-rotary kiln-circular cooler, the utility model adopts the shaft furnace with smaller occupied area to finish roasting, thereby not only improving the space utilization rate, but also shortening the flow, and having small occupied area, convenient operation and maintenance, high heat efficiency, investment reduction, quality improvement and yield increase, and production efficiency improvement.

5. The utility model combines the sintering machine with the shaft furnace to bake the pellets, adopts drying, sintering and preheating on the sintering machine, has low use temperature and prolongs the whole service life of the sintering machine equipment.

6. The utility model can realize that the stroke system only has one inlet and one outlet in the whole roasting process, and the smoke is efficiently circulated in the air system by additionally arranging the regenerative fan, thereby not only improving the cooling efficiency, but also improving the heat utilization rate, reducing the discharge point, reducing the energy consumption, improving the quality and increasing the yield, and reducing the environmental pollution.

7. According to the utility model, the waste heat flue gas of the shaft furnace is fully utilized to dry and preheat the pellets, the temperature difference between the preheated pellet temperature and the temperature in the shaft furnace is reduced, the material layer resistance is reduced, the pulverization of the pellets during dynamic roasting is avoided, the roasting quality of the pellets is improved, and the load of the shaft furnace is reduced.

8. According to the utility model, the pellet is preheated in a cascade way through the regenerative air system, so that the generation of nitrogen oxides is reduced, the desulfurization and denitration cost is further reduced, and the environment is protected.

9. Therefore, the utility model has the characteristics of small occupied area, high utilization rate of waste heat, low energy consumption, simple equipment, no special requirement on equipment structure materials, convenient operation and maintenance, high heat efficiency, low investment cost of pellet roasting equipment, high productivity and good roasting quality.

Drawings

FIG. 1 is a schematic diagram of a sintering machine-shaft furnace pellet firing system according to the present utility model;

in fig. 1: 01: a sintering machine; 02: a bedding material distributing device; 03: a return belt; 04: a green ball distributing device; 05: drying for one section; 06: drying for one section; 07: a pre-heating section; 08: preheating the second section; 09: a tail seal cover; 10: an inlet pipeline II; 11: a No. 2 regenerative fan; 12: a return hot air branch-4 pipeline; 13: a shaft furnace; 14: a burner; 15: cooling fan 16: tooth roller discharger; 17: a lower hopper; 18: an electric vibration feeder; 19: a conveying device; 20: a No. 1 regenerative fan; 21: an outlet pipeline I; 22: a dust removal pipeline; 23: a dust remover; 24: a dust removal induced draft fan; 25: a chimney; 26: dust removing big flue; 27: hot air will flow through the large flue; 28: a return hot air branch-2 pipeline; 29: a return hot air branch-1 pipeline; 30: a wind box; 31: a return air connecting pipeline; 32: an inlet pipeline I; 33: a return hot air branch-3 pipeline; 34: a regulating valve; 35: an outlet pipeline II; 36: a combustion chamber; 37: a roasting section; 38: a soaking section; 39: a cooling section; 40: a cold air duct; 41: a return air pipeline No. 1; 42: return air No. 2 pipeline; 43: a dust removal connecting pipeline; 44: a gas pipeline; 45: a combustion air duct; 46: desulfurization and denitrification device.

Detailed Description

The technical scheme of the present utility model is further described in detail below with reference to fig. 1, and the scope of the present utility model is not limited to the following examples.

According to the technical scheme of the utility model, a sintering machine-shaft furnace pellet roasting system is provided.

A sintering machine-shaft furnace pellet roasting system, which comprises a sintering machine 01 and a shaft furnace 13. The sealed fume hood above the sintering machine 01 is arranged, and raw balls are dried and preheated on the sintering machine 01, so that the sintering machine is divided into two large sections, namely a drying section and a preheating section, according to the trend of materials, the sealed fume hood above the sintering machine 01 is sequentially divided into a drying section 05, a drying section 06, a preheating section 07 and a preheating section 08, the tail of the sintering machine 01 is provided with a tail sealing cover 09, and a discharge port at the lower end of the tail sealing cover 09 is connected with a feed port of a shaft furnace 13; the shaft furnace 13 is divided into a roasting section 37, a soaking section 38 and a cooling section 39 from the lower part of the feed inlet, and roasting, soaking and cooling are all completed on the shaft furnace 13.

In the utility model, a wind box 30 is arranged at the lower part of the sintering machine 01, a hot air return large flue 27 is arranged below a preheating section wind box 30, the hot air return large flue 27 is connected with the preheating section wind box 30 through a hot air return connecting pipeline 31, hot flue gas after preheating a first section 07 and a second section 08 preheating pellets is collected to the hot air return large flue 27 through the wind box 30 and the hot air return connecting pipeline 31, the hot air return large flue 27 is connected with an inlet of a No. 1 hot air return fan 20 through an inlet pipeline 32 of the No. 1 hot air return fan 20, the No. 1 hot flue gas is pumped out from the wind box 30 at the bottom of the preheating section, the hot flue gas is conveyed to a drying section through an outlet pipeline 21 of the No. 1 hot air return fan 20, the first outlet pipeline 21 of the No. 1 hot air return fan 20 is divided into two branches before entering a drying section 05 and a drying section 06 sealing fume hood, the hot air return branch-1 pipeline 29 enters the drying section, the hot air return branch-2 pipeline 28 enters the drying section, and a regulating valve 34 is arranged on the hot air return branch pipeline to control the flue gas amount entering the drying section 05 and the drying section 06.

In the utility model, a wind box 30 is arranged at the lower part of the sintering machine 01, a large dust removing flue 26 is arranged below a wind box 30 of a drying section, the large dust removing flue 26 is connected with the wind box 30 of the drying section through a dust removing connecting pipeline 43, waste flue gas after drying pellets in a first drying section 05 and a second drying section 06 is collected to the large dust removing flue 26 through the wind box 30 of the drying section and the dust removing connecting pipeline 43, the large dust removing flue 26 is connected with a dust remover 23, a dust removing induced draft fan 24 and a desulfurization and denitrification device 46 through a dust removing pipeline 22, and the dust removing induced draft fan 24 is used for treating the dust removed flue gas through the desulfurization and denitrification device 46 and delivering the treated flue gas to an emptying flue tube 25 for safe discharge after reaching standards.

In the present utility model, the shaft furnace 13 comprises a shaft furnace body, a combustion chamber 36, a burner 14, a cooling fan 15, a toothed roll discharger 16, a lower hopper 17, an electric vibration feeder 18, a conveying apparatus 19; the two sides of the shaft furnace 13 are provided with combustion chambers 36, two ends of each side of the combustion chamber 36 are provided with mounting holes of the burner 14, the outlet of the burner 14 is arranged on the mounting holes at the end part of the combustion chamber 36, and the inlet of the burner 14 is provided with a combustion air pipeline 45 and a fuel gas pipeline 44; the cooling fans 15 are arranged on two sides of the furnace body and are connected with the furnace body through cold air pipelines 40, and the cold air pipelines are arranged on the cooling section 39; the tooth roller discharger 16 is arranged at the lower part of the cooling section 39, so that the pellets uniformly fall into the lower hopper 17, and the lower hopper 17 continuously falls into the conveying equipment 19 through the electric vibration feeder 18, and is conveyed to a finished product area through the conveying equipment 19.

In the utility model, high-temperature flue gas in the shaft furnace 13 is pumped out through a return air No. 1 pipeline 41 and a return air No. 2 pipeline 42 which are connected with a furnace body, the return air No. 1 pipeline 41 and the return air No. 2 pipeline 42 are connected with a No. 2 return fan 11 inlet pipeline II 10, a No. 2 return fan 11 outlet pipeline II 35 is connected with a No. 2 return fan 11 outlet, the high-temperature flue gas conveys high-temperature hot air to a preheating section through a No. 2 return fan 11 outlet pipeline II 35, the No. 2 return fan 11 outlet pipeline II 35 is divided into two branches to be respectively introduced before entering a preheating section 07 and a preheating section 08 sealing smoke hood, a return air branch-3 pipeline 33 enters the preheating section, a return air branch-4 pipeline 12 enters the preheating section, and a regulating valve 34 is arranged on the branch pipeline to control the flue gas quantity entering the preheating section 07 and the preheating section 08.

In the utility model, the system also comprises a bedding material distributing device 02 and a green ball distributing device 04; according to the trend of the materials, the bedding material distributing device 02 and the green ball distributing device 04 are sequentially arranged above the feeding end of the sintering machine 01, and the green ball distributing device 04 drops unqualified materials on the return belt 03 to return.

In the utility model, the sintering machine 01 mainly comprises a head wheel and a driving device, a head framework and a head sealing cover, a head bent rail, a distributing device, a trolley, an igniter, a middle framework, a bellows, a slideway and a seal, a trolley travelling rail, a tail wheel and a tail moving frame, a tail chute and a tail sealing cover, and other auxiliary supporting facilities. The utility model is characterized in that the device is dried and preheated on a sintering machine 01, and baked, soaked and cooled on a shaft furnace 13, so that an igniter at the upper part of the original sintering machine 01 is only required to be removed, and then a sealing smoke hood is arranged on the sintering machine 01 and is divided into a drying section and a preheating section according to the trend of materials; the original devices, facilities and the like matched with the sintering machine 01 can be used continuously, so that the utilization rate of the facilities is greatly improved, the cost of new investment equipment is reduced, and the economic benefit is improved; because the sintering machine 01 is only used for drying and preheating pellets, the using temperature is relatively low, the refractory materials in each section of sealed fume hood can be refractory ceramic fiber board, and the sintering machine has the advantages of small heat conductivity and low heat capacity; the thermal shock resistance, corrosion resistance and thermal stability are good; good machining performance; the use temperature is high, and the flame can be directly contacted; the pressure resistance is high, and the service life is long; the installation and the use are convenient, etc.; in order to prevent corrosion during smoke circulation, a layer of wear-resistant and high-temperature-resistant spray paint can be sprayed on the surface of the kiln, meanwhile, due to the fact that the density of the kiln hood is relatively low, the material specification of the sealed smoke hood and a rack can be reduced, compared with a belt type roasting machine, the weight of the sealed smoke hood and the rack in a drying section and a preheating section is reduced, and investment cost is reduced.

In the utility model, a shaft furnace 01 is arranged at the lower end of a discharge hole of a sealing cover 09 at the tail part of a sintering machine 01, the discharge hole at the lower end of the sealing cover 09 at the tail part is connected with a feed hole of a shaft furnace 13, pellets after preheating treatment in a drying section and a preheating section directly enter the shaft furnace 13, the temperature of the pellets entering the shaft furnace 13 is about 650-750 ℃, the baking, soaking and cooling are completed in the shaft furnace 13, the cooled pellets are discharged from a hopper and conveyed to a finished product area through conveying equipment 19; the shaft furnace 13 is adopted to bake the pellets, so that the device is simple, the maintenance operation is convenient, the heat efficiency is high, the furnace body structure has no special requirements on materials, and the overall cost is low; and the original circular cooler is removed, the shaft furnace is arranged, the occupied area is reduced, and the space utilization rate is improved.

The implementation principle of the embodiment of the utility model is as follows:

the bedding material distributing device 02 lays finished pellets on a trolley of the sintering machine 01, and then the green pellets are arranged on the bedding material by the green pellet distributing device 04 and conveyed according to the running direction.

The green pellets enter an air draft drying first section 05, and secondary hot flue gas from a preheating first section 07 and a preheating second section 08 is led in by a No. 1 regenerative fan 20 to carry out the first air draft drying on the green pellets and take away dust.

The green pellets enter an exhaust drying second section 06, and secondary hot flue gas from the preheating first section 07 and the preheating second section 08 is led in by a No. 1 regenerative fan 20 to carry out secondary exhaust drying on the green pellets and take away dust.

The green pellets enter an exhaust preheating section 07, and are preheated for the first time by high-temperature flue gas led in from the shaft furnace 13 by a No. 2 regenerative fan 11, so that the surface temperature and the internal temperature of pellets are improved.

The green pellets enter an exhaust preheating second section 08, and the high-temperature flue gas from the shaft furnace 13 is led into a No. 2 regenerative fan 11 to preheat the green pellets for the second time, so that the surface temperature and the internal temperature of the pellets are further improved.

Pellets after the preheating treatment of the drying section and the preheating section directly enter the shaft furnace 13 at a blanking port of the tail of the sintering machine 01, the temperature of the pellets entering the shaft furnace 13 is 650-750 ℃, the pellets after the drying and the preheating treatment in the shaft furnace 13 reach a certain strength, and the pellets move in the furnace body from top to bottom once through the roasting section 37, the soaking section 38 and the cooling section 39; the firing section 37 fires the pellets at high temperatures using fuel.

The cooled pellets after roasting are discharged into a lower hopper 17 through a toothed roller discharger 16, the pellets are continuously dropped into a conveying device 19 through an electric vibration feeder 18 by the lower hopper 17, and are conveyed to a finished product area through the conveying device 19, so that the whole roasting process is completed.

The using method of the sintering machine-shaft furnace pellet roasting system is as follows: the bedding material distributing device 02 lays finished pellets on the sintering machine 01, and then the green pellet distributing device 03 distributes green pellets on the bedding material. The sintering machine 01 slowly rotates to drive materials to sequentially enter a first drying section 05, a second drying section 06, a first preheating section 07 and a second preheating section 08, pellets after being preheated by the drying section and the preheating section directly enter a shaft furnace 13, and the pellet temperature entering the shaft furnace 13 is about 650-750 ℃; the baking, soaking and cooling are completed in the shaft furnace 13, the cooled pellets are discharged from a hopper, the discharging temperature is generally 100-200 ℃, and the pellets are conveyed to a finished product area through a conveying device 19.

The dust remover can adopt electric dust removal or cloth bag dust removal; the conveying equipment can adopt a heat-resistant conveying belt conveyor, a belt cooler for conveying and a chain plate machine.

The foregoing is a specific embodiment of the present utility model and is not intended to limit the scope of the utility model in any way, wherein like reference numerals refer to like elements throughout. All equivalent changes in structure, shape and principle of the utility model should be covered in the protection scope of the present application.

Claims

1. A sintering machine-shaft furnace pellet roasting system is characterized by comprising a sintering machine (01) and a shaft furnace (13), wherein a sealing smoke hood is additionally arranged above the sintering machine (01), green pellets are dried and preheated on the sintering machine (01), so that the sintering machine is divided into two sections, namely a drying section and a preheating section, and a hot air return large flue (27) and a dust removal large flue (26) are additionally arranged at the lower part of a wind box (30) of the sintering machine (01); the large backheating air flue (27) is connected with the preheating section bellows through a backheating air connecting pipeline (31), hot flue gas of the preheating section is conveyed to the drying section by adopting a backheating fan, and the hot flue gas is used for drying green pellets; the device is characterized in that the shaft furnace (13) is arranged at a proper position at the tail part of the sintering machine (01), the tail part of the sintering machine (01) is connected with the top of the shaft furnace (13) in a sealing way, high-temperature flue gas in the shaft furnace (13) is conveyed to a preheating section through a backheating fan to preheat green pellets, the dried and preheated pellets on the sintering machine (01) enter the shaft furnace (13) to finish sintering, and finally the pellets are conveyed to a finished product area through conveying equipment (19) at the lower part of the shaft furnace (13).

2. The sintering machine-shaft furnace roasting pellet system according to claim 1, wherein a sealing hood is arranged above the sintering machine (01), the sealing hood above the sintering machine (01) is sequentially divided into a first drying section (05), a second drying section (06), a first preheating section (07) and a second preheating section (08) according to the trend of materials, a tail sealing hood (09) is arranged at the tail part of the sintering machine (01), and a discharge port at the lower end of the tail sealing hood (09) is connected with a feed port of the shaft furnace (13); the shaft furnace (13) is divided into a roasting section (37), a soaking section (38) and a cooling section (39) from the lower part of the feed inlet at one time, and roasting, soaking and cooling are completed on the shaft furnace (13).

3. The sintering machine-shaft furnace roasting pellet system according to claim 1, wherein a wind box (30) is arranged at the lower part of the sintering machine (01), a hot air return large flue (27) is arranged below the wind box (30) of the preheating section, the hot air return large flue (27) is connected with the wind box (30) of the preheating section through a hot air return connecting pipeline (31), hot flue gas after preheating the first section (07) and the second section (08) for preheating pellets is collected into the hot air return large flue (27) through the wind box (30) and the hot air return connecting pipeline (31), the hot air return large flue (27) is connected with the inlet of the hot air return fan (20) through a first inlet pipeline (32) of the hot air return fan (20) of the No. 1, the hot flue gas is pumped out from the wind box (30) at the bottom of the preheating section through a first outlet pipeline (21) of the hot air return fan (20) to the drying section, the first outlet pipeline (21) of the hot flue gas is divided into two branches respectively into a first branch pipeline (21) and a second branch pipeline (29) before entering the drying section (05) and the second section (06) for sealing the smoke hood, the first branch pipeline enters the second branch pipeline (29) of the hot air return section (28), and an adjusting valve (34) is arranged on the regenerative air branch pipeline to control the flue gas quantity entering the drying first section (05) and the drying second section (06).

4. The sintering machine-shaft furnace roasting pellet system according to claim 1, wherein an air box (30) is arranged at the lower part of the sintering machine (01), a dust removing large flue (26) is arranged below the drying section air box (30), the dust removing large flue (26) is connected with the drying section air box (30) through a dust removing connecting pipeline (43), waste flue gas after drying the first section (05) and the second section (06) and drying pellets is collected to the dust removing large flue (26) through the drying section air box (30) and the dust removing connecting pipeline (43), the dust removing large flue (26) is connected with a dust remover (23), a dust removing induced draft fan (24) and a desulfurization and denitrification device (46) through the dust removing induced draft fan (24), and the dust removed flue gas is processed through the desulfurization and denitrification device (46) and then is sent to an emptying flue tube (25) for safe discharge.

5. The sintering machine-shaft furnace pellet roasting system according to claim 1, characterized in that the shaft furnace (13) comprises a shaft furnace body, a combustion chamber (36), a burner (14), a cooling fan (15), a toothed roller discharger (16), a lower hopper (17), an electric vibration feeder (18) and a conveying device (19); the two sides of the shaft furnace (13) are provided with combustion chambers (36), two ends of each side of the combustion chamber (36) are provided with mounting holes of the burner (14), an outlet of the burner (14) is arranged on the mounting holes at the end part of the combustion chamber (36), and an inlet of the burner (14) is provided with a combustion air pipeline (45) and a fuel gas pipeline (44); the cooling fans (15) are arranged at two sides of the furnace body and are connected with the furnace body through cold air pipelines (40), and the cold air pipelines are arranged at the cooling section (39); the tooth roller discharger (16) is arranged at the lower part of the cooling section (39), so that the pellets uniformly fall into the lower hopper (17), and the lower hopper (17) continuously falls into the conveying equipment (19) through the electric vibration feeder (18), and is conveyed to a finished product area through the conveying equipment (19).

6. The sintering machine-shaft furnace roasting pellet system according to claim 1, wherein high-temperature flue gas in the shaft furnace (13) is pumped out through a heat return air pipeline No. 1 (41) and a heat return air pipeline No. 2 (42) which are connected with a furnace body, the heat return air pipeline No. 1 (41) and the heat return air pipeline No. 2 (42) are connected with a heat return fan (11) inlet pipeline II (10), a heat return fan (11) outlet pipeline II (35) is connected with a heat return fan (11) outlet of No. 2, the high-temperature flue gas conveys the high-temperature hot air to a preheating section through the heat return fan (11) outlet pipeline II (35) of No. 2, the heat return air pipeline II (35) is divided into two branches before entering a preheating section (07) and a preheating section (08) sealing fume hood, a heat return air branch-3 pipeline (33) enters the preheating section, a heat return air branch-4 pipeline (12) enters the preheating section II, and a regulating valve (34) is arranged on the branch pipeline to control the air quantity entering the preheating section (07) and the preheating section II (08).

7. The sintering machine-shaft furnace pellet roasting system according to claim 1, characterized in that the system further comprises a bedding material distributing device (02) and a green pellet distributing device (04); according to the trend of the materials, the bedding material distributing device (02) and the green ball distributing device (04) are sequentially arranged above the feeding end of the sintering machine (01), and the green ball distributing device (04) drops unqualified materials on the ore return belt (03) to return.