CN219793070U - Shaft furnace oxidized pellet production system with front drying function - Google Patents

Abstract

The utility model discloses a pre-drying shaft furnace oxidized pellet production system which comprises a pre-drying mechanism, a shaft furnace and a belt cooler. The front drying mechanism comprises a hot air drying section and a microwave drying section. The discharging end of the front drying mechanism is connected with the feeding end of the shuttle type distributor. The hot air outlet of the cooling machine is communicated with the air inlet of the hot air drying section through a pipeline. The system performs coupling drying through hot air drying and microwave drying, realizes rapid and efficient drying of green pellets, greatly improves the strength of pellets entering a shaft furnace, reduces the breakage rate of the pellets, further improves the quality and yield of finished pellets, and simultaneously realizes the recycling and purification of sensible heat of waste hot air through a hot air circulation drying and multipolar hot air purification treatment unit, reduces the production energy consumption and avoids environmental pollution.

Description

Shaft furnace oxidized pellet production system with front drying function

Technical Field

The utility model relates to oxidized pellet production equipment, in particular to a shaft furnace oxidized pellet production system with a front-end drying function, and belongs to the technical field of oxidized pellet production.

Background

Pellet and sintering are two common processes used as iron ore refining in the iron and 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 pellets by a pelletizer under the condition of being wetted by adding water, and drying, roasting and solidifying to obtain the spherical iron-containing raw material with certain strength and metallurgical properties.

The main production processes of the oxidized pellet at present mainly comprise the following three types: the method comprises three processes of a grate-rotary kiln pellet process, a belt roasting machine pellet process and a shaft furnace pellet process. For the production process of the shaft furnace oxidized pellets, the drying, the preheating, the roasting and the soaking of the pellets are all completed in the shaft furnace body, and the high Wen Chengpin pellets after the roasting in the shaft furnace are discharged to a belt cooler for cooling. The existing shaft furnace oxidized pellet production process is shown in the accompanying figure 1: raw balls in the ball making chamber are transported to a shuttle type distributing device 2 through a feeding adhesive tape 1, and the shuttle type distributing device 2 distributes the raw balls into a shaft furnace 3, so that the drying, preheating, roasting and other processes of the raw balls are completed; finally, the roasted pellets are discharged to a hot chain plate machine 5 through an electric vibration feeder 4 at the bottom of the shaft furnace 3, and the high-temperature roasted pellets are transported to a cooling mechanism 6 for cooling through the hot chain plate machine 5, and cooled finished pellets are transported out through a tape machine.

The existing shaft furnace oxidized pellet production process mainly has the following problems: the green pellets entering the shaft furnace have low strength, the crushing proportion is higher in the processes of discharging to the drying bed and drying on the drying bed, and after the green pellets are crushed, the production environment in the shaft furnace is deteriorated and the pellet yield is reduced; the drying speed of the green pellets in a drying bed in the shaft furnace is low, so that the yield of the pellets in the shaft furnace is severely limited; in addition, in the existing shaft furnace pellet production process, the high-temperature flue gas of the belt cooler and the shaft furnace top is usually directly discharged into the atmosphere in an unstructured manner, so that a large amount of sensible heat in the high-temperature flue gas is wasted, and the environment is seriously affected.

Disclosure of Invention

Aiming at the problems of low green pellet strength entering a shaft furnace, high green pellet breakage rate, low pellet yield, low yield, environmental pollution caused by direct discharge of external exhaust gas, large quantity of sensible heat loss of flue gas and the like in the prior art, the utility model provides a front-end drying shaft furnace oxidized pellet production system, which is used for carrying out coupling drying through hot air drying and microwave drying in a front-end drying mechanism, realizing rapid and efficient drying of green pellets, greatly improving the strength of the pellets entering the shaft furnace, reducing the pellet breakage rate, further improving the quality and yield of finished pellets, and simultaneously realizing the recycling and purification of sensible heat of waste hot air, reducing the production energy consumption and avoiding the environmental pollution through hot air circulation drying and adding a multi-stage hot air treatment unit.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a pre-drying shaft furnace oxidized pellet production system comprises a pre-drying mechanism, a shaft furnace and a belt cooler. The front drying mechanism comprises a hot air drying section and a microwave drying section which are sequentially connected in series. The shaft furnace comprises a shuttle distributor, a furnace body and a vibration unloader which are sequentially connected in series from top to bottom. The belt cooler comprises a first cooling section, a second cooling section and a third cooling section which are sequentially connected in series. The discharging end of the front drying mechanism is connected with the feeding end of the shuttle type distributor. The feeding end of the belt cooler is connected with the discharging end of the vibration unloader. The hot air outlet of the cooling machine is communicated with the air inlet of the hot air drying section through a pipeline.

Preferably, the front drying mechanism is a drying device of a chain grate, and comprises a hot air drying section, a microwave drying section and a cooling section which are sequentially connected in series, and a heat preservation cover which is covered above the hot air drying section, the microwave drying section and the cooling section. The hot air drying section comprises an air drying section and an air draft drying section which are sequentially connected in series, and a windproof partition plate is arranged on a heat insulation cover between the air drying section and the air draft drying section.

Preferably, the discharge end of the cooling section is connected to the feed end of the shuttle distributor by a transfer tape machine.

Preferably, the front drying mechanism is a steel belt type dryer and comprises a hot air drying section, a microwave drying section and a heat preservation cover, wherein the hot air drying section and the microwave drying section are sequentially connected in series, and the heat preservation cover is covered above the hot air drying section and the microwave drying section. The hot air drying section comprises an air drying section and an air draft drying section which are sequentially connected in series, and a windproof partition plate is arranged on a heat insulation cover between the air drying section and the air draft drying section. The discharging end of the microwave drying section is directly connected with the feeding end of the shuttle distributor.

Preferably, the tail end of the heat preservation cover extends to cover the junction of the discharging end of the microwave drying section and the feeding end of the shuttle distributor along the running direction of the materials.

Preferably, a microwave heating device is arranged above the microwave drying section. The microwave heating device comprises a microwave generator and a microwave controller. The microwave generator is arranged inside the heat preservation cover above the microwave drying section, the microwave controller is arranged outside the heat preservation cover above the microwave drying section, and the microwave controller is electrically connected with the microwave generator.

Preferably, a heat-insulating layer with an inverted structure is further arranged on the inner wall of the heat-insulating cover positioned in the microwave drying section.

Preferably, the bottoms of the first cooling section, the second cooling section and the third cooling section are respectively provided with an air cooler, and a hot air cover is covered above the first cooling section, the second cooling section and the third cooling section. The air outlet of the hot air cover above the cooling three sections is communicated with the bottom air inlet of the forced air drying section through a first hot air conveying pipeline. The air outlet of the hot air cover above the cooling second section is communicated with the top air inlet of the heat preservation cover above the air draft drying section through a second hot air conveying pipeline. And a blower is arranged on the first hot air conveying pipeline. And an exhaust fan is connected with the bottom exhaust outlet of the exhaust drying section.

Preferably, the feed end of the cooling section is connected to the discharge end of the vibratory unloader by a hot chain trigger.

Preferably, the system further comprises a first hot air treatment unit. The first hot air treatment unit comprises a first dust remover and a first exhaust fan which are sequentially connected in series, and an exhaust outlet of the first exhaust fan is communicated with the chimney. The top air outlet of the heat preservation cover above the blast drying section is communicated with the hot air outlet of the first dust remover through a third hot air conveying pipeline. The bottom air outlet of the exhaust drying section is communicated with the third hot air conveying pipeline through a fourth hot air conveying pipeline or is directly communicated with the hot air outlet of the first dust remover through the fourth hot air conveying pipeline, and the exhaust fan is arranged on the fourth hot air conveying pipeline.

Preferably, the system further comprises a second hot air treatment unit. The second hot air treatment unit comprises a first waste heat boiler, a second dust remover, a desulfurization and denitrification tower and a second exhaust fan which are sequentially connected in series, and an air outlet of the second exhaust fan is communicated with the chimney. The air inlet of the first waste heat boiler is communicated with the top air outlet of the shaft furnace through a fifth hot air conveying pipeline.

Preferably, the system further comprises a third hot air treatment unit. The third hot air treatment unit comprises a second waste heat boiler, a third dust remover and a third exhaust fan which are sequentially connected in series, and an air outlet of the third exhaust fan is communicated with the chimney. The air inlet of the second waste heat boiler is communicated with the air outlet of the hot air cover above the cooling section through a sixth hot air conveying pipeline.

Preferably, the air outlet of the hot air cover above the microwave drying section and/or the cooling section is communicated with the first hot air conveying pipeline through a seventh hot air conveying pipeline. And a regenerative fan is arranged on the seventh hot air conveying pipeline.

Preferably, a fourth dust remover is further arranged on the second hot air conveying pipeline.

Preferably, a hot air branch pipe is led out from the second hot air conveying pipeline positioned at the downstream of the fourth dust remover. The exhaust end of the hot air branch pipe is communicated with the air inlet of the first dust collector, or the exhaust end of the hot air branch pipe is communicated with a third hot air conveying pipeline, wherein: the connection point of the hot air branch pipe and the third hot air conveying pipeline is positioned at the downstream of the connection point of the fourth hot air conveying pipeline and the third hot air conveying pipeline. And the hot air branch pipe is also provided with a flow regulating valve.

Preferably, the first dust remover, the second dust remover, the third dust remover and the fourth dust remover are respectively one of a cloth bag dust remover, an electric dust remover and a tubular dust remover.

In the prior art, the drying, preheating, roasting and soaking of the seed pellets in the production process of the shaft furnace oxidized pellets are all completed in the shaft furnace body, and due to the low green pellet strength entering the shaft furnace, the proportion of crushing in the processes of discharging to a drying bed and drying on the drying bed is high, and after the green pellets are crushed, the internal production environment of the shaft furnace is deteriorated, and the pellet yield is reduced; the drying speed of the green pellets in a drying bed in the shaft furnace is low, so that the yield of the pellets in the shaft furnace is severely limited; in addition, in the existing shaft furnace pellet production process, the high-temperature flue gas of the belt cooler and the shaft furnace top is usually directly discharged into the atmosphere in an unstructured manner, so that a large amount of sensible heat in the high-temperature flue gas is wasted, and the environment is seriously affected. Further, some existing external drying devices only adopt the flue gas at the top of the shaft furnace as drying hot air to dry the pellets, the drying time of the pellets is long, the distance span of drying equipment is large, the occupied space is large, the arrangement difficulty is high, the adaptability is poor, the pellets are dried by using the flue gas at the top of the shaft furnace, the production stability is poor, and the fluctuation of the flue gas temperature, the flow and the like can influence the quality of finished pellets.

In the utility model, a pre-drying mechanism is arranged in front of the shaft furnace and used for pre-drying the green pellets, and comprises a hot air drying section and a microwave drying section which are sequentially connected in series. According to the utility model, through coupling hot air drying and microwave drying, the quick and efficient drying of the green pellets is realized, the strength of the pellets entering the shaft furnace is greatly improved, the crushing rate of the pellets is reduced, the quality and the yield of finished pellets are further improved, meanwhile, the green pellets are dried by circulating hot air with a cooler to a hot air drying section as drying hot air, and the waste heat recovery and purification treatment of the shaft furnace flue gas and the residual flue gas with the cooler are then discharged, so that the sensible heat recovery and the utilization of the waste hot air of the system are realized, the production energy consumption is reduced, and the environmental pollution is avoided.

In the utility model, the front-end drying mechanism is a drying device of a chain grate or a steel belt type dryer. When the front drying mechanism is a drying device of the drying grate, the drying device of the drying grate comprises a hot air drying section, a microwave drying section and a cooling section which are sequentially connected in series, and a heat preservation cover which is covered above the hot air drying section, the microwave drying section and the cooling section; the discharging end of the cooling section is connected with the feeding end of a shuttle distributor at the upper end of the shaft furnace through a transfer tape machine. When the front-mounted drying mechanism is a steel belt type dryer, the steel belt type dryer comprises a hot air drying section, a microwave drying section and a heat preservation cover which is covered above the hot air drying section and the microwave drying section, wherein the hot air drying section and the microwave drying section are sequentially connected in series, and the discharging end of the microwave drying section is directly connected with the feeding end of a shuttle distributor at the upper end of the shaft furnace. The drying device of the chain grate machine or the steel belt type dryer can be used as the front-end of the drying process of the shaft furnace, the effect that the pellet drying process is transferred to the outside of the furnace is realized, the green pellets are dried by adopting a unique mode of conventional hot air drying and serial microwave drying, the green pellet drying speed is effectively improved, and the single-machine yield of the shaft furnace can be indirectly improved.

It is to be noted that the drying by the grate or the steel belt type dryer is required according to the actual situationConfigured if the shaft furnace roof space is sufficient (e.g. for 10m ³ The length of the drying section of the shaft furnace with capacity is about 30m, and the drying section is preferably dried by a steel belt type dryer and then is directly fed into the shaft furnace, and at the moment, a cooling section is not required to be designed after microwave drying because the transportation by using a rubber belt is not required, so that the energy is saved.

In the utility model, the hot air drying section comprises a blast drying section and an exhaust drying section which are sequentially connected in series, and when the pellets are dried, the blast drying is firstly adopted, and then the exhaust drying is carried out, so that the crushing proportion of the pellets can be effectively reduced. Because the green pellets are easy to form over-wet belts in the pellets at the lower layer when the green pellets are dried by air suction when the moisture content is large (the moisture in hot air is condensed after the temperature is reduced below, so that the pellets at the lower layer are over-wet and cracked). In a preferred embodiment of the utility model, the hot air for the forced air drying section is derived from the cooling hot air discharged from the hot air hood above the cooling three sections of the belt cooler, and the hot air for the induced air drying section is derived from the cooling hot air discharged from the hot air hood above the cooling two sections of the belt cooler.

In the utility model, the inner cavity of the heat preservation cover above the air blowing drying section and the air exhausting drying section is provided with the windproof partition board, and the windproof partition board can separate the air blowing drying section above the materials from the air exhausting drying section, so that the influence of hot air (such as channeling or convection) between the air blowing drying section and the air exhausting drying section is reduced.

In the utility model, the hot air after drying in the microwave drying section and the cooling section has a certain temperature, so that the hot air can be circulated and combined with the hot air of the cooling section and enter the blast drying section to dry the pellets.

In the present utility model, the microwave heating device includes a microwave generator and a microwave controller. The microwave generator is arranged inside the heat preservation cover above the microwave drying section, the microwave controller is arranged outside the heat preservation cover above the microwave drying section, and the microwave controller is electrically (wired or wireless) connected with the microwave generator. The start and stop of a plurality of microwave generators can be controlled simultaneously through one microwave controller, so that the pellets can be dried efficiently by microwaves. Generally, microwaves refer to electromagnetic waves with a frequency of 300MHz-300GHz, and the basic properties of the microwaves are generally three characteristics of penetration, reflection and absorption, and the microwaves have the characteristics of selective heating, rapid heating, cleaning and the like. The ability of a substance to absorb microwaves is largely determined by its dielectric loss tangent. The water molecules belong to polar molecules, have larger dielectric constants and dielectric loss factors, and have strong absorption capacity to microwaves. Iron oxides, sulfides and carbon molecules also have a strong ability to absorb microwaves as wave absorbers.

In the utility model, the hot air cover above the body with the cooler is divided into: the cooling device comprises a cooling first section, a cooling second section and a cooling third section (a baffle plate for preventing air channeling is arranged in a hot air cover between the cooling sections). And air coolers are respectively arranged below the first cooling section, the second cooling section and the third cooling section. The hot air cover with the cooling machine is positioned in the first cooling section, the second cooling section and the third cooling section, and the temperature of the hot air is sequentially reduced. Generally, the temperature of hot air in the cooling first section is above 350 ℃, the temperature of hot air in the cooling second section is between 250 and 300 ℃, and the temperature of hot air in the cooling third section is between 110 and 150 ℃.

In the utility model, for the waste hot air after drying by the front-end drying mechanism, the waste hot air at the top of the shaft furnace and the waste hot air discharged by the cooling section, corresponding hot air treatment units (a first hot air treatment unit, a second hot air treatment unit and a third hot air treatment unit) are respectively arranged according to the properties of each hot air, and the utilization of waste heat in the waste hot air and the purification of pollutants contained in the waste hot air are realized through each hot air treatment unit, so that the finally discharged hot air is low-temperature low-pollutant hot air, the health of the ecological environment is effectively maintained, and the green emission is realized.

In the utility model, when waste hot air after drying of the front-end drying mechanism is treated, hot air of the cooling second section can be shunted to the main air pipe of the bag type dust collector entering the corresponding hot air treatment unit through the branch pipe (hot air branch pipe), and the branch pipe is provided with the flow regulating valve.

In the utility model, high-temperature flue gas at the top of the shaft furnace enters the waste heat boiler under the action of the exhaust fan to recover waste heat, then enters the electric dust collector to carry out dust removal treatment, finally enters the desulfurization and denitrification tower to be purified and is discharged into the atmosphere through a chimney. The temperature of the flue gas at the top of the existing shaft furnace is about 300 ℃ after the pellets are dried at the top of the shaft furnace through a drying bed, and the high-temperature flue gas at the top of the shaft furnace is greatly improved after the drying section of the shaft furnace is arranged outside the shaft furnace in the utility model, so that the value of waste heat recovery is greatly improved compared with the value of waste heat recovery before (when the drying section is not arranged externally).

In the utility model, the green pellets are subjected to preliminary hot air drying by introducing cooling hot air of a pellet belt cooler, so that most of water in the green pellets is removed. And then, by utilizing the characteristics of uniform microwave heating and quick temperature rise, a small amount of water which is difficult to remove in the green ball inner core after hot air drying is further removed, the purposes of thoroughly drying the green ball, strengthening the drying process and improving the green ball strength are achieved, and meanwhile, the reasonable distribution of the power consumption of the whole process is realized. Compared with the conventional hot air drying method, the method has the defects that moisture in the green ball kernel is difficult to remove and the drying time is long; or compared with the problem of high energy consumption caused by adopting full microwave drying, researches show that when the full microwave is used for drying green pellets, 1.4 kW.h of electricity is required for every 1kg of water to be removed; the water which is easy to remove from the green pellets is more economical to dry by conventional hot air. The hot air drying and serial microwave drying mode can effectively and rapidly dry the pellets, improve the pellet strength, and has low drying cost increment and better comprehensive economic benefit.

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

1: according to the shaft furnace oxidized pellet production system for pre-drying, the green pellets are dried in the unique mode of conventional hot air drying and serial microwave drying in the pre-drying mechanism, the green pellets are greatly improved in strength, microwave heating is uniform and fast, and compared with the traditional hot air drying, the green pellets are not easy to crack in the drying process, so that the ratio of broken green pellets can be effectively reduced in the process of transferring and distributing the green pellets to the shaft furnace, and the yield and the output of the pellets can be effectively improved.

2: according to the utility model, through the arrangement of the hot air circulation drying and multipolar hot air waste heat utilization and purification units, the reasonable utilization of the hot air of the whole system is realized, and the low-temperature hot air in the belt cooler is used for recycling the dried green pellets; the hot gas in the high temperature section is used for recovering waste heat. After the front drying process in the shaft furnace is carried out, the temperature of flue gas at the top of the shaft furnace is increased, and the value of hot air waste heat recovery is greatly improved; the utility model realizes the improvement of the strength and the yield of the pellets, simultaneously greatly reduces the energy consumption and saves the production cost.

3: the production system of the pre-dried shaft furnace oxidized pellet has the characteristics of simple structure, convenience in construction, low production input cost and high overall economic benefit, has excellent popularization and application performances, and can be designed and improved according to local conditions. Can simultaneously meet the requirements of new plant production or old plant reconstruction production.

Drawings

FIG. 1 is a schematic diagram of a conventional shaft furnace oxidized pellet production system.

Fig. 2 is a schematic structural view of a pre-dried shaft kiln oxidized pellet production system of the present utility model.

FIG. 3 is a schematic illustration of the connection of the steel belt type pre-drying mechanism of the present utility model to a shaft furnace.

FIG. 4 is a schematic view of the drying apparatus of the grate of the present utility model.

Fig. 5 is a schematic structural view of the steel belt dryer of the present utility model.

Description of the drawings: 1: a front drying mechanism; 101: a hot air drying section; 1011: a blast drying section; 1012: an air draft drying section; 1013: a wind-proof partition; 102: a microwave drying section; 103: a cooling section; 104: a thermal insulation cover; 105: a transfer tape machine; 2: a shaft furnace; 201: shuttle type distributing device; 202: a furnace body; 203: a vibrating unloader; 3: a belt cooler; 301: cooling the first section; 302: cooling the second section; 303: cooling three sections; 304: with an air cooler; 305: a hot air cover; 306: a hot chain plate machine; 4: a microwave heating device; 401: a microwave generator; 402: a microwave controller; 403: a heat preservation layer; 5: a first hot air treatment unit; 501: a first dust collector; 502: a first exhaust fan; 6: a second hot air treatment unit; 601: a first waste heat boiler; 602: a second dust collector; 603: a desulfurization and denitrification tower; 604: a second exhaust fan; 7: a third hot air treatment unit; 701: a second waste heat boiler; 702: a third dust collector; 703: a third exhaust fan; 8: a fourth dust collector; 9: a flow regulating valve; r1: a first hot air delivery duct; r2: a second hot air delivery duct; r21: a hot air branch pipe; r3: a third hot air delivery duct; r4: a fourth hot air delivery duct; r5: a fifth hot air delivery duct; r6: a sixth hot air delivery duct; r7: a seventh hot air delivery duct; f1: a blower; f2: an exhaust fan; f3: and a regenerative fan.

Detailed Description

The following examples illustrate the technical aspects of the utility model, and the scope of the utility model claimed includes but is not limited to the following examples.

A pre-drying shaft furnace oxidized pellet production system comprises a pre-drying mechanism 1, a shaft furnace 2 and a belt cooler 3. The front drying mechanism 1 comprises a hot air drying section 101 and a microwave drying section 102 which are sequentially connected in series. The shaft furnace 2 comprises a shuttle distributor 201, a furnace body 202 and a vibrating unloader 203 which are sequentially connected in series from top to bottom. The belt cooler 3 comprises a first cooling section 301, a second cooling section 302 and a third cooling section 303 which are sequentially connected in series. The discharge end of the pre-drying mechanism 1 is connected with the feed end of the shuttle distributor 201. The feed end of the belt cooler 3 is connected to the discharge end of the vibration unloader 203. The cooled hot air outlet of the belt cooler 3 is communicated with the air inlet of the hot air drying section 101 through a pipeline.

Preferably, the pre-drying mechanism 1 is a drying device of a drying grate, and comprises a hot air drying section 101, a microwave drying section 102 and a cooling section 103 which are sequentially connected in series, and a heat insulation cover 104 which is covered above the hot air drying section 101, the microwave drying section 102 and the cooling section 103. The hot air drying section 101 comprises a blast drying section 1011 and an induced draft drying section 1012 which are sequentially connected in series, and a wind-proof baffle 1013 is arranged on the heat insulation cover 104 between the blast drying section 1011 and the induced draft drying section 1012.

Preferably, the discharge end of the cooling section 103 is connected to the feed end of the shuttle dispenser 201 by a transfer tape machine 105.

Preferably, the pre-drying mechanism 1 is a steel belt type dryer, and comprises a hot air drying section 101 and a microwave drying section 102 which are sequentially connected in series, and a heat insulation cover 104 which is covered above the hot air drying section 101 and the microwave drying section 102. The hot air drying section 101 comprises a blast drying section 1011 and an induced draft drying section 1012 which are sequentially connected in series, and a wind-proof baffle 1013 is arranged on the heat insulation cover 104 between the blast drying section 1011 and the induced draft drying section 1012. The discharge end of the microwave drying section 102 is directly connected to the feed end of the shuttle distributor 201.

Preferably, the tail end of the heat insulation cover 104 extends along the running direction of the material and covers the junction between the discharge end of the microwave drying section 102 and the feed end of the shuttle distributor 201.

Preferably, a microwave heating device 4 is arranged above the microwave drying section 102. The microwave heating device 4 comprises a microwave generator 401 and a microwave controller 402. The microwave generator 401 is disposed inside the heat insulation cover 104 above the microwave drying section 102, the microwave controller 402 is disposed outside the heat insulation cover 104 above the microwave drying section 102, and the microwave controller 402 is electrically connected with the microwave generator 401.

Preferably, an inverted U-shaped insulation layer 403 is also provided on the inner wall of the insulation cover 104 in the microwave drying section 102.

Preferably, the bottoms of the first cooling section 301, the second cooling section 302 and the third cooling section 303 are respectively provided with an air cooler 304, and a hot air cover 305 is covered above the first cooling section 301, the second cooling section 302 and the third cooling section 303. The air outlet of the hot air cover 305 above the cooling three sections 303 is communicated with the bottom air inlet of the forced air drying section 1011 through a first hot air conveying pipeline R1. The air outlet of the hot air cover 305 above the cooling second section 302 is communicated with the top air inlet of the heat insulation cover 104 above the air exhausting and drying section 1012 through a second hot air conveying pipeline R2. The first hot air conveying pipeline R1 is provided with a blower F1. The bottom air outlet of the air draft drying section 1012 is connected with an air draft fan F2.

Preferably, the feed end of the cooling section 301 is connected to the discharge end of the vibratory unloader 203 by a hot chain trigger 306.

Preferably, the system further comprises a first hot air treatment unit 5. The first hot air treatment unit 5 comprises a first dust remover 501 and a first exhaust fan 502 which are sequentially connected in series, and an air outlet of the first exhaust fan 502 is communicated with a chimney. The top air outlet of the heat preservation cover 104 above the blast drying section 1011 is communicated with the hot air outlet of the first dust remover 501 through a third hot air conveying pipeline R3. The bottom air outlet of the exhaust drying section 1012 is communicated with the third hot air conveying pipeline R3 through a fourth hot air conveying pipeline R4 or is directly communicated with the hot air outlet of the first dust remover 501 through the fourth hot air conveying pipeline R4, and the exhaust fan F2 is arranged on the fourth hot air conveying pipeline R4.

Preferably, the system further comprises a second hot air treatment unit 6. The second hot air treatment unit 6 comprises a first waste heat boiler 601, a second dust remover 602, a desulfurization and denitrification tower 603 and a second exhaust fan 604 which are sequentially connected in series, and an air outlet of the second exhaust fan 604 is communicated with a chimney. The air inlet of the first waste heat boiler 601 is communicated with the top air outlet of the shaft furnace 2 through a fifth hot air conveying pipeline R5.

Preferably, the system further comprises a third hot air treatment unit 7. The third hot air treatment unit 7 comprises a second waste heat boiler 701, a third dust remover 702 and a third exhaust fan 703 which are sequentially connected in series, and an air outlet of the third exhaust fan 703 is communicated with a chimney. The air inlet of the second waste heat boiler 701 is communicated with the air outlet of the hot air cover 305 above the cooling section 301 through a sixth hot air conveying pipeline R6.

Preferably, the air outlet of the hot air hood 305 above the microwave drying section 102 and/or the cooling section 103 is communicated with the first hot air conveying pipeline R1 through a seventh hot air conveying pipeline R7. And a backheating fan F3 is arranged on the seventh hot air conveying pipeline R7.

Preferably, a fourth dust remover 8 is further disposed on the second hot air conveying pipeline R2.

Preferably, a hot air branch pipe R21 is also led out on the second hot air delivery pipe R2 downstream of the fourth dust collector 8. The exhaust end of the hot air branch pipe R21 is communicated with the air inlet of the first dust collector 501, or the exhaust end of the hot air branch pipe R21 is communicated with the third hot air conveying pipeline R3, wherein: the connection point of the hot air branch pipe R21 and the third hot air delivery pipe R3 is located downstream of the connection point of the fourth hot air delivery pipe R4 and the third hot air delivery pipe R3. The hot air branch pipe R21 is also provided with a flow regulating valve 9.

Preferably, each of the first dust collector 501, the second dust collector 602, the third dust collector 702 and the fourth dust collector 8 is independently one of a bag-type dust collector, an electric dust collector and a tubular dust collector.

Example 1

As shown in fig. 2-5, a pre-drying shaft kiln oxidized pellet production system comprises a pre-drying mechanism 1, a shaft kiln 2 and a belt cooler 3. The front drying mechanism 1 comprises a hot air drying section 101 and a microwave drying section 102 which are sequentially connected in series. The shaft furnace 2 comprises a shuttle distributor 201, a furnace body 202 and a vibrating unloader 203 which are sequentially connected in series from top to bottom. The belt cooler 3 comprises a first cooling section 301, a second cooling section 302 and a third cooling section 303 which are sequentially connected in series. The discharge end of the pre-drying mechanism 1 is connected with the feed end of the shuttle distributor 201. The feed end of the belt cooler 3 is connected to the discharge end of the vibration unloader 203. The cooled hot air outlet of the belt cooler 3 is communicated with the air inlet of the hot air drying section 101 through a pipeline.

Example 2

Example 1 is repeated except that the pre-drying mechanism 1 is a drying device of a grate, and comprises a hot air drying section 101, a microwave drying section 102 and a cooling section 103 which are sequentially connected in series, and a heat insulation cover 104 which is covered above the hot air drying section 101, the microwave drying section 102 and the cooling section 103. The hot air drying section 101 comprises a blast drying section 1011 and an induced draft drying section 1012 which are sequentially connected in series, and a wind-proof baffle 1013 is arranged on the heat insulation cover 104 between the blast drying section 1011 and the induced draft drying section 1012.

Example 3

Example 2 was repeated except that the discharge end of the cooling section 103 was connected to the feed end of the shuttle dispenser 201 by the transfer tape machine 105.

Example 4

Embodiment 1 is repeated except that the pre-drying mechanism 1 is a steel belt type dryer, and comprises a hot air drying section 101 and a microwave drying section 102 which are sequentially connected in series, and a heat insulation cover 104 which is covered above the hot air drying section 101 and the microwave drying section 102. The hot air drying section 101 comprises a blast drying section 1011 and an induced draft drying section 1012 which are sequentially connected in series, and a wind-proof baffle 1013 is arranged on the heat insulation cover 104 between the blast drying section 1011 and the induced draft drying section 1012. The discharge end of the microwave drying section 102 is directly connected to the feed end of the shuttle distributor 201.

Example 5

Example 4 is repeated except that the tail end of the heat-insulating cover 104 extends along the running direction of the material and covers the junction between the discharge end of the microwave drying section 102 and the feed end of the shuttle distributor 201.

Example 6

Example 5 was repeated except that a microwave heating device 4 was provided above the microwave drying section 102. The microwave heating device 4 comprises a microwave generator 401 and a microwave controller 402. The microwave generator 401 is disposed inside the heat insulation cover 104 above the microwave drying section 102, the microwave controller 402 is disposed outside the heat insulation cover 104 above the microwave drying section 102, and the microwave controller 402 is electrically connected with the microwave generator 401.

Example 7

Example 6 was repeated except that an inverted U-shaped heat insulation layer 403 was further provided on the inner wall of the heat insulation cover 104 located in the microwave drying section 102.

Example 8

Example 7 was repeated except that the bottoms of the first cooling stage 301, the second cooling stage 302 and the third cooling stage 303 were each provided with a cooling fan 304, and a hot air hood 305 was provided over the first cooling stage 301, the second cooling stage 302 and the third cooling stage 303. The air outlet of the hot air cover 305 above the cooling three sections 303 is communicated with the bottom air inlet of the forced air drying section 1011 through a first hot air conveying pipeline R1. The air outlet of the hot air cover 305 above the cooling second section 302 is communicated with the top air inlet of the heat insulation cover 104 above the air exhausting and drying section 1012 through a second hot air conveying pipeline R2. The first hot air conveying pipeline R1 is provided with a blower F1. The bottom air outlet of the air draft drying section 1012 is connected with an air draft fan F2.

Example 9

Example 8 was repeated except that the feed end of the cooling section 301 was connected to the discharge end of the vibratory unloader 203 by a hot plate machine 306.

Example 10

Example 9 is repeated except that the system further comprises a first hot air treatment unit 5. The first hot air treatment unit 5 comprises a first dust remover 501 and a first exhaust fan 502 which are sequentially connected in series, and an air outlet of the first exhaust fan 502 is communicated with a chimney. The top air outlet of the heat preservation cover 104 above the blast drying section 1011 is communicated with the hot air outlet of the first dust remover 501 through a third hot air conveying pipeline R3. The bottom air outlet of the induced draft drying section 1012 is directly communicated with the hot air outlet of the first dust remover 501 through a fourth hot air conveying pipeline R4, and an exhaust fan F2 is arranged on the fourth hot air conveying pipeline R4.

Example 11

Example 10 was repeated except that the bottom exhaust port of the suction drying section 1012 was in communication with the third hot air delivery duct R3 through the fourth hot air delivery duct R4.

Example 12

Example 11 is repeated except that the system further comprises a second hot air treatment unit 6. The second hot air treatment unit 6 comprises a first waste heat boiler 601, a second dust remover 602, a desulfurization and denitrification tower 603 and a second exhaust fan 604 which are sequentially connected in series, and an air outlet of the second exhaust fan 604 is communicated with a chimney. The air inlet of the first waste heat boiler 601 is communicated with the top air outlet of the shaft furnace 2 through a fifth hot air conveying pipeline R5.

Example 13

Example 12 is repeated except that the system further comprises a third hot air treatment unit 7. The third hot air treatment unit 7 comprises a second waste heat boiler 701, a third dust remover 702 and a third exhaust fan 703 which are sequentially connected in series, and an air outlet of the third exhaust fan 703 is communicated with a chimney. The air inlet of the second waste heat boiler 701 is communicated with the air outlet of the hot air cover 305 above the cooling section 301 through a sixth hot air conveying pipeline R6.

Example 14

Example 13 was repeated except that the air outlet of the hot air hood 305 above the microwave drying section 102 and the cooling section 103 was communicated with the first hot air conveying duct R1 through the seventh hot air conveying duct R7. And a backheating fan F3 is arranged on the seventh hot air conveying pipeline R7.

Example 15

Example 14 was repeated except that a fourth dust collector 8 was further provided on the second hot air delivery duct R2.

Example 16

Example 15 was repeated except that a hot air branch pipe R21 was also led out on the second hot air delivery pipe R2 located downstream of the fourth dust collector 8. The exhaust end of the hot air branch pipe R21 is communicated with the air inlet of the first dust remover 501. The hot air branch pipe R21 is also provided with a flow regulating valve 9.

Example 17

Example 16 was repeated except that the exhaust end of the hot air branch pipe R21 was communicated with a third hot air delivery pipe R3, in which: the connection point of the hot air branch pipe R21 and the third hot air delivery pipe R3 is located downstream of the connection point of the fourth hot air delivery pipe R4 and the third hot air delivery pipe R3.

Example 18

Embodiment 17 is repeated except that the first dust collector 501, the second dust collector 602, and the third dust collector 702 are all bag-type dust collectors.

Example 19

Example 18 is repeated except that the fourth dust separator 8 is a column Guan Chuchen separator.

Claims (14)

1. A shaft furnace oxidized pellet production system with pre-drying function is characterized in that: the system comprises a front-end drying mechanism (1), a shaft furnace (2) and a belt cooler (3); the front drying mechanism (1) comprises a hot air drying section (101) and a microwave drying section (102) which are sequentially connected in series; the shaft furnace (2) comprises a shuttle distributor (201), a furnace body (202) and a vibration unloader (203) which are sequentially connected in series from top to bottom; the belt cooler (3) comprises a first cooling section (301), a second cooling section (302) and a third cooling section (303) which are sequentially connected in series; the discharging end of the front drying mechanism (1) is connected with the feeding end of the shuttle distributor (201); the feeding end of the belt cooler (3) is connected with the discharging end of the vibration unloader (203); the cooled hot air outlet of the belt cooler (3) is communicated with the air inlet of the hot air drying section (101) through a pipeline.

2. The shaft furnace oxidized pellet production system of claim 1, wherein: the front drying mechanism (1) is a drying device of a chain grate, and comprises a hot air drying section (101), a microwave drying section (102) and a cooling section (103) which are sequentially connected in series, and a heat preservation cover (104) which is covered above the hot air drying section (101), the microwave drying section (102) and the cooling section (103); the hot air drying section (101) comprises a blast drying section (1011) and an induced draft drying section (1012) which are sequentially connected in series, and a windproof baffle plate (1013) is arranged on a heat insulation cover (104) between the blast drying section (1011) and the induced draft drying section (1012).

3. The shaft furnace oxidized pellet production system of claim 2, wherein: the discharge end of the cooling section (103) is connected with the feed end of the shuttle distributor (201) through the transfer tape machine (105).

4. The shaft furnace oxidized pellet production system of claim 1, wherein: the front drying mechanism (1) is a steel belt type dryer and comprises a hot air drying section (101) and a microwave drying section (102) which are sequentially connected in series, and a heat preservation cover (104) which is covered above the hot air drying section (101) and the microwave drying section (102); the hot air drying section (101) comprises a blast drying section (1011) and an induced draft drying section (1012) which are sequentially connected in series, and a windproof baffle plate (1013) is arranged on a heat insulation cover (104) between the blast drying section (1011) and the induced draft drying section (1012); the discharging end of the microwave drying section (102) is directly connected with the feeding end of the shuttle distributor (201).

5. The shaft kiln oxidized pellet production system of claim 4, wherein: the tail end of the heat preservation cover (104) extends to cover the junction of the discharge end of the microwave drying section (102) and the feed end of the shuttle distributor (201) along the running direction of the materials.

6. The shaft furnace oxidized pellet production system according to any one of claims 2 to 5, characterized in that: a microwave heating device (4) is arranged above the microwave drying section (102); the microwave heating device (4) comprises a microwave generator (401) and a microwave controller (402); the microwave generator (401) is arranged inside the heat preservation cover (104) above the microwave drying section (102), the microwave controller (402) is arranged outside the heat preservation cover (104) above the microwave drying section (102), and the microwave controller (402) is electrically connected with the microwave generator (401).

7. The shaft furnace oxidized pellet production system of claim 6, wherein: an inverted U-shaped heat preservation layer (403) is arranged on the inner wall of the heat preservation cover (104) positioned in the microwave drying section (102).

8. The shaft furnace oxidized pellet production system of claim 6, wherein: the bottoms of the first cooling section (301), the second cooling section (302) and the third cooling section (303) are respectively provided with an air cooler (304), and a hot air cover (305) is covered above the first cooling section (301), the second cooling section (302) and the third cooling section (303); an air outlet of the hot air cover (305) above the cooling three sections (303) is communicated with a bottom air inlet of the forced air drying section (1011) through a first hot air conveying pipeline (R1); an air outlet of the hot air cover (305) above the cooling second section (302) is communicated with a top air inlet of the heat insulation cover (104) above the air draft drying section (1012) through a second hot air conveying pipeline (R2); a blower (F1) is arranged on the first hot air conveying pipeline (R1); the bottom air outlet of the air draft drying section (1012) is connected with an air draft fan (F2).

9. The shaft furnace oxidized pellet production system of claim 8, wherein: the feed end of the cooling section (301) is connected to the discharge end of the vibration unloader (203) by a hot chain trigger (306).

10. The shaft furnace oxidized pellet production system of claim 8, wherein: the system also comprises a first hot air treatment unit (5); the first hot air treatment unit (5) comprises a first dust remover (501) and a first exhaust fan (502) which are sequentially connected in series, and an air outlet of the first exhaust fan (502) is communicated with a chimney; the top air outlet of the heat preservation cover (104) above the blast drying section (1011) is communicated with the hot air outlet of the first dust remover (501) through a third hot air conveying pipeline (R3); the bottom air outlet of the exhaust drying section (1012) is communicated with the third hot air conveying pipeline (R3) through a fourth hot air conveying pipeline (R4) or is directly communicated with the hot air outlet of the first dust remover (501) through the fourth hot air conveying pipeline (R4), and an exhaust fan (F2) is arranged on the fourth hot air conveying pipeline (R4).

11. The shaft furnace oxidized pellet production system of claim 10, wherein: the system also comprises a second hot air treatment unit (6); the second hot air treatment unit (6) comprises a first waste heat boiler (601), a second dust remover (602), a desulfurization and denitrification tower (603) and a second exhaust fan (604) which are sequentially connected in series, and an air outlet of the second exhaust fan (604) is communicated with a chimney; an air inlet of the first waste heat boiler (601) is communicated with a top air outlet of the shaft furnace (2) through a fifth hot air conveying pipeline (R5).

12. The shaft furnace oxidized pellet production system of claim 11, wherein: the system also comprises a third hot air treatment unit (7); the third hot air treatment unit (7) comprises a second waste heat boiler (701), a third dust remover (702) and a third exhaust fan (703) which are sequentially connected in series, and an air outlet of the third exhaust fan (703) is communicated with a chimney; an air inlet of the second waste heat boiler (701) is communicated with an air outlet of a hot air cover (305) above the cooling section (301) through a sixth hot air conveying pipeline (R6).

13. The shaft furnace oxidized pellet production system of claim 12, wherein: the air outlet of the hot air cover (305) above the microwave drying section (102) and/or the cooling section (103) is communicated with the first hot air conveying pipeline (R1) through a seventh hot air conveying pipeline (R7); a regenerative fan (F3) is arranged on the seventh hot air conveying pipeline (R7); and/or

And a fourth dust remover (8) is further arranged on the second hot air conveying pipeline (R2).

14. The shaft furnace oxidized pellet production system of claim 13, wherein: a hot air branch pipe (R21) is also led out from a second hot air conveying pipeline (R2) positioned at the downstream of the fourth dust remover (8); the exhaust end of the hot air branch pipe (R21) is communicated with the air inlet of the first dust remover (501), or the exhaust end of the hot air branch pipe (R21) is communicated with a third hot air conveying pipeline (R3), wherein: the connection point of the hot air branch pipe (R21) and the third hot air conveying pipeline (R3) is positioned at the downstream of the connection point of the fourth hot air conveying pipeline (R4) and the third hot air conveying pipeline (R3); the hot air branch pipe (R21) is also provided with a flow regulating valve (9); and/or

The first dust remover (501), the second dust remover (602), the third dust remover (702) and the fourth dust remover (8) are respectively one of a cloth bag dust remover, an electric dust remover and a tubular dust remover.