CN215373448U - Waste heat utilization system of rotary pelletizing shaft furnace - Google Patents
Waste heat utilization system of rotary pelletizing shaft furnace Download PDFInfo
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- CN215373448U CN215373448U CN202121496679.XU CN202121496679U CN215373448U CN 215373448 U CN215373448 U CN 215373448U CN 202121496679 U CN202121496679 U CN 202121496679U CN 215373448 U CN215373448 U CN 215373448U
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Abstract
The utility model provides a waste heat utilization system of a rotary pelletizing shaft furnace, which comprises: the device comprises a waste heat utilization type shaft furnace, a weighing and conveying device, an auxiliary material preheating system and a dust removal system; the waste heat utilization type shaft furnace is used for roasting the hot pellets; the auxiliary material preheating system is used for preheating the auxiliary material; the weighing and conveying device is used for conveying and discharging the preheated auxiliary materials by the auxiliary material preheating system; the inlet end of the dust removal system is communicated with a flue gas outlet after heat exchange of the auxiliary material preheating system; a tail gas outlet of the waste heat utilization type shaft furnace is provided with a heat collecting device for collecting the heat of the tail gas discharged by the waste heat utilization type shaft furnace; a first heat source of the auxiliary material preheating system is a heat collecting device; the pellet heat is fully utilized, hot charging is achieved, and the smelting power consumption of the submerged arc furnace is reduced. The hot pellet only needs one-time transportation in the whole batching process, so that the heat loss is reduced, and the charging temperature of the pellet is improved. This application shaft furnace tail gas is used for drying, preheats the reductant coke in the auxiliary material through waste heat recovery, improves energy-conserving effect.
Description
Technical Field
The utility model relates to the technical field of ferroalloy smelting, in particular to a waste heat utilization system of a rotary pellet shaft furnace.
Background
At present, two processes of a pre-reduction pelletizing method and an oxidation pelletizing method are mainly used internationally for smelting high-carbon ferrochromium. The pre-reduction pelletizing process mainly takes the SRC process as the main process and is widely applied to south Africa and Japan, the process has the advantages of obvious electricity-saving effect, suitability for areas with short power supply and high electric charge, higher investment, difficult control of pre-reduction rate in pellets, difficult control of ore-smelting furnace carbon distribution and large operation difficulty coefficient.
The oxidized pellet mainly adopts a rotary shaft furnace process and an Ottokumpp process. The Ottompp process was pioneered by Ottompp (Outokumpu) corporation in Finland in 1968, and the process involves a huge water treatment problem, and pellets need to be reheated after being cooled, so that the heat loss is large; foreign technologies are introduced, so that the equipment investment is large; the grate plate needs to be replaced once every year, and the equipment maintenance cost is high; the preheating kilns are arranged on the left and right of a platform with the furnace top of 30m, the height of a factory building needs to be more than 50m, and the civil engineering cost investment is large; the advantage is that the preheating kiln can dry and preheat the reducing agent in the raw materials, so that the water content of the reducing agent is controlled within the process requirements of the fully-closed submerged arc furnace, and the operation stability of the submerged arc furnace is improved. Compared with other processes, the process has the advantages of low investment cost, low pellet production and operation cost, good environment-friendly and energy-saving effects and the like, and only the company is implemented and used on the Indonesian Repu 4X 36000kVA high-carbon ferrochrome project in the world at present.
In the production and use process of the rotary shaft furnace, the following 3 problems mainly exist in the aspects of high efficiency and energy conservation:
the pellets in the material storage hopper of the shaft furnace are discharged out of the shaft furnace after being cooled and heat exchanged through cooling air, so that the hot charging temperature of the pellets is reduced, and the reduction of the smelting power consumption of the submerged arc furnace is not facilitated; the utility model patent ZL201510975778.9 discloses that the heat pellet is cooled and heat exchanged by cooling air, the discharge temperature of the pellet is between 300 ℃ and 400 ℃, the sensible heat of the pellet is utilized for roasting, and the smelting power consumption of the submerged arc furnace is increased.
Secondly, conveying the pellets discharged from the shaft furnace into a buffer tank through a vibrating feeder, then conveying the pellets into a weighing hopper through an outlet vibrating feeder of the buffer tank, and finally conveying the pellets into a hot material tank through an outlet vibrating feeder of the weighing hopper, wherein the hot pellets need to be conveyed backwards for three times, and the temperature loss is about 100 ℃.
And thirdly, the temperature of the tail gas of the shaft furnace is 160-200 ℃, the tail gas is directly discharged into the atmosphere after being dedusted by an electrostatic precipitator, the heat loss is large, and the utilization rate is low.
Disclosure of Invention
According to the technical problems, the waste heat utilization system of the rotary pellet shaft furnace is provided, which can improve the heat efficiency of the shaft furnace, reduce the smelting power consumption of the submerged arc furnace, comprehensively recycle the tail gas of the shaft furnace, improve the operation stability of the submerged arc furnace and perfect the smelting process of the rotary shaft furnace by the oxidized pellet method.
The technical means adopted by the utility model are as follows:
a rotary pelletizing shaft furnace waste heat utilization system comprises: the device comprises a waste heat utilization type shaft furnace 1, a weighing and conveying device 2, an auxiliary material preheating system 3 and a dust removal system 4;
the waste heat utilization type shaft furnace 1 is used for roasting hot pellets;
the auxiliary material preheating system 3 is used for preheating auxiliary materials;
the weighing and conveying device 2 is used for the conveying and auxiliary material preheating system 3 to discharge the preheated auxiliary materials;
the inlet end of the dust removal system 4 is communicated with the flue gas outlet after heat exchange of the auxiliary material preheating system 3;
a heat collecting device for collecting the heat of the exhaust gas discharged by the waste heat utilization type shaft furnace 1 is arranged at the exhaust gas outlet;
the first heat source of the auxiliary material preheating system 3 is a heat collecting device (a second heat source can be introduced when the auxiliary heat effect is insufficient);
a weighing and conveying device 2 is arranged at the auxiliary material outlet of the auxiliary material preheating system 3;
the qualified auxiliary materials preheated by the auxiliary material preheating system 3 are conveyed to the weighing and conveying device 2 according to the production process batching requirement for mixing, and the blanking amount of the waste heat utilization type shaft furnace 1 and the auxiliary material preheating system 3 is adjusted in real time according to the weighing module feedback signal of the weighing and conveying device 2, so that accurate batching is achieved.
Further, the weighing and conveying device 2 conveys the mixture to a submerged arc furnace workshop in a rail transportation mode.
Further, the waste heat utilization type shaft furnace 1 includes: the device comprises a feeding device I5 (belt conveyor), a roasting chamber, a driving device 10, a material level detection device 11, a material storage hopper 12, a pneumatic valve 13, a pellet discharging device 14, a buffer bin 15, a burner 16 and discharging equipment 17;
when 1 production of waste heat utilization type shaft furnace, the green pellet passes through loading attachment I (belt feeder) material loading and carries the roasting chamber in, and the roasting chamber includes: an outer cylindrical sleeve 6, an inner cylindrical sleeve 7 and a material storage platform 9;
the outer cylindrical sleeve 6 and the inner cylindrical sleeve 7 are concentric, the center of the circle of the material storage platform 9 is offset by 50-70mm relative to the centers of the former two, and the eccentric amount can be automatically adjusted;
the material storage platform 9 makes rotary motion through the driving device 10, the material storage platform 9 can drive the outer cylindrical sleeve 6 and the inner cylindrical sleeve 7 to rotate together, the blocking wheels 8 are arranged on the outer cylindrical sleeve 6 and the inner cylindrical sleeve 7 in the circumferential direction, and the roasted cooked pellets fall into the shaft furnace material storage hopper 12 arranged below under the eccentric rotation effect;
the lower part of a storage hopper 12 of the cooked pellet shaft furnace is periodically discharged according to production and batching requirements through a discharging device 17 at the lower part of the storage hopper 12 of the pellet shaft furnace, a material level detection device 11 is arranged on the outer wall of the storage hopper 12, and the material level height is adjusted through a material level feedback signal;
the inlet end of the pellet discharging device 14 is communicated with the pellet stacking part of the pellet shaft furnace storage hopper 12, the outlet end of the pellet discharging device 14 is communicated with the buffer bin 15, and the opening and the closing of the pellet discharging device 14 are controlled by a valve 13;
the upper part of the pellet storage hopper 12 is a combustion chamber, and a burner 16 is arranged in the combustion chamber.
Further, the gas used by the burner 16 is the gas of the ore-smelting furnace.
Further, the weighing conveyor 2 includes: a hot bucket 18, a hot-bucket car 19 supporting and holding the hot bucket 18, and a rail weighbridge 20;
the weighing mode adopts a rail weighbridge 20, and a traveling rail for traveling the hot material tank car 19 is arranged above the rail weighbridge 20.
Further, supplementary material preheating system 3 includes: the auxiliary material bin comprises a plurality of auxiliary material bins 24, a feeding device II 21 (belt conveyor) for adding auxiliary materials into the auxiliary material bins 24, a weighing device 25 for weighing the auxiliary material bins, and a variable frequency belt conveyor 27 which is arranged below the auxiliary material bins 24 and used for conveying preheated auxiliary materials;
the auxiliary material bin 24 realizes accurate weighing by means of the weighing device 25, and the rotating speed of the variable frequency belt conveyor 27 is adjusted by a weighing feedback signal, so that each batch of materials is accurately conveyed to the weighing and conveying device 2;
a plurality of heat exchange beams 26 are arranged in the auxiliary material bin 24, and the heat exchange beams 26 are arranged in an auxiliary material accumulation area at the lower part of the auxiliary material bin 24;
the heat collecting device collects hot flue gas of the waste heat utilization type shaft furnace 1 and finally leads the hot flue gas into a heat exchange beam 26 of an auxiliary material bin 24 through a pipeline, the hot flue gas passes through the heat exchange beam 26 and is sprayed into the auxiliary material bin 24 through a gas outlet hole preset in the side wall of the heat exchange beam 26 to be used for drying and preheating the auxiliary material, a tail gas outlet pipeline used for discharging internal gas is arranged on the auxiliary material bin 24, and the tail gas outlet pipeline is communicated with the dust removal system 4;
each auxiliary bin 24 is an independent feeding port, the feeding path is provided with an independent valve for controlling the on-off of the path, each auxiliary bin 24 is provided with an independent tail gas outlet pipeline, and each tail gas outlet pipeline is provided with a flue gas inlet valve 23 and a flue gas outlet valve 23 for controlling the on-off of the pipelines.
Further, the heat exchange beam 26 includes: the branch beam 29 and the middle connecting mechanism 28, one end of the branch beam 29 is fixed with the wall of the auxiliary material bin 24, the wall of the fixed position is provided with a hole to ensure that the flue gas can enter the branch beam 29 from the outer wall of the auxiliary material bin 24, the branch beam 29 is of a box-shaped beam structure, and the side wall is provided with a plurality of small holes to disperse and guide out hot flue gas, so that the hot flue gas is in full contact with the auxiliary material in the auxiliary material bin 24 to carry out heat exchange, and the aim of preheating the auxiliary material is fulfilled; the other end of the branch beam 29 is fixed with the middle connecting mechanism 28, the middle connecting mechanism 28 connects the branch beams 29 to form the heat exchange beam 26 with a stable structure, the side wall and the top of the middle connecting mechanism 28 are provided with holes, the side wall holes are communicated with the branch beams 29, and finally, redundant hot smoke enters the auxiliary material bin from the holes reserved at the top of the middle connecting mechanism 28 to preheat the auxiliary material.
Compared with the prior art, the utility model has the following advantages:
1. the discharging temperature of the pellets is improved, the hot charging into the furnace is realized, and the smelting power consumption of the submerged arc furnace is reduced;
2. the pellet transporting times are reduced, the heat loss is reduced, and the heat efficiency is improved;
3. the civil engineering investment of the shaft furnace workshop is reduced;
4. the tail gas of the shaft furnace is preheated and recycled, the energy-saving effect is improved, and the additional equipment investment for drying and preheating auxiliary materials is reduced.
5. The auxiliary material bin is arranged in the shaft furnace workshop, the process is not limited by the transportation of auxiliary materials from the batching station to the shaft furnace workshop by the long-time belt conveyor, and the whole batching system is flexible and stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a process flow diagram of the system of the present invention.
FIG. 2 is a schematic elevational view of a waste heat utilizing shaft furnace of the present invention.
Fig. 3 is an elevation view of the weighing conveyer of the present invention.
FIG. 4 is a process flow diagram of the adjuvant preheating system of the present invention.
FIG. 5 is a structural diagram of an auxiliary material bin heat exchange beam of the present invention.
In the figure: 1. the waste heat utilization type shaft furnace 2, the weighing and conveying device 3, the auxiliary material preheating system 4 and the dust removal system;
5. the feeding device I6, the outer cylindrical sleeve 7, the inner cylindrical sleeve 8, the catch wheel 9, the material storage platform 10, the driving device 11, the material level detection device 12, the material storage hopper 13, the pneumatic valve 14, the pellet discharging device 15, the buffer bin 16, the burner 17 and the discharging device;
21. the feeding device II 22, the feeding valve 23, the smoke inlet and outlet valve 24, the auxiliary material bin 25, the weighing device 26, the heat exchange beam 27 and the variable frequency belt conveyor;
28. intermediate linkage 29, the spreader beam.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The utility model provides a waste heat utilization system of a rotary pellet shaft furnace, which is mainly used for improving the pellet discharging temperature of the shaft furnace, reducing the dumping and transporting times of hot pellets roasted by the shaft furnace and realizing waste heat utilization by utilizing the waste heat of high-temperature flue gas generated by the shaft furnace.
The device comprises a waste heat utilization type shaft furnace 1, a weighing and conveying device 2, an auxiliary material preheating system 3 and a dust removal system 4, and is shown in figure 1.
The hot pellet that waste heat utilization type shaft furnace 1 calcination is good carries to weighing conveyor 2 according to the production technology batching requirement with the qualified auxiliary material that auxiliary material preheating system 3 preheats in carrying out the compounding, carries out real-time regulation to waste heat utilization type shaft furnace 1 and auxiliary material preheating system 3's unloading volume according to weighing conveyor 2 weighing module feedback signal, reaches accurate batching function, finally weighs conveyor 2 and adopts the rail transport mode to send the mixture to the hot stove workshop in ore deposit, see figure 1.
When the waste heat utilization type shaft furnace 1 is used for production, green pellets are generally fed and conveyed into a roasting chamber through a feeding device I5 by selecting a belt conveyor, the average roasting temperature is about 1050 ℃, and the roasting chamber consists of an outer cylindrical sleeve 6, an inner cylindrical sleeve 7 and a storage platform 9. The outer cylindrical sleeve 6 and the inner cylindrical sleeve 7 are concentric, the center of the material storage platform 9 is offset by 50-70mm relative to the centers of the former two, and the eccentric amount can be automatically adjusted. The material storage platform 9 makes a rotary motion through the driving device 10, the roasting chamber is filled with pellets, under the action of friction force, the material storage platform 9 can drive the outer cylindrical sleeve 6 and the inner cylindrical sleeve 7 to rotate together, the blocking wheels 8 are arranged on the circumferential directions of the outer cylindrical sleeve 6 and the inner cylindrical sleeve 7, and the roasted cooked pellets fall into the shaft furnace material storage hopper 12 under the action of eccentric rotation. The cooked pellet temperature is about 600 ℃, is stored in the lower part of the storage hopper 12, is discharged periodically according to the production batching demand through the discharging equipment 17, and the outer wall of the storage hopper 12 is provided with a material level detection device 11 for adjusting the material level height through a material level feedback signal. The material level height adjustment has two methods, namely, the rotating speed of the material storage platform 9 is adjusted to control the blanking amount, the pneumatic valve 13 on the pellet discharging device 14 is adjusted, the pneumatic valve 13 is opened, and pellets rich in the pellets can be conveyed into the buffer bin 15; the upper part of the pellet storage hopper 12 is a combustion chamber, and the fuel of the burner 16 is ore-smelting furnace gas. In the process of the totally-enclosed smelting of the high-carbon ferrochrome, the gas amount generated by each ton of iron is 750Nm3, the gas amount consumed by each ton of iron is about 2.2t, the gas amount consumed by each ton of pellets by the ore-smelting furnace is 150Nm3, the total gas amount consumed by 2.2t of pellets is 2.2 multiplied by 150Nm3, the residual gas amount generated by each ton of iron is 750 plus 330n 420Nm3, it can be seen that the gas amount of the shaft furnace only accounts for 44% of the gas generation amount of the ore-smelting furnace, and the residual gas amount of the ore-smelting furnace is very large, so that the utility model completely utilizes the ore-smelting furnace gas pellets to sinter the pellets, improves the discharge temperature of the pellets, realizes the hot charging into the furnace, and reduces the smelting electricity consumption of the ore-smelting furnace, and is shown in figure 2.
The weighing and conveying device 2 is used for weighing, proportioning and conveying and mainly comprises a hot material tank 18, a hot material tank car 19 and a track scale 20. The weighing mode adopts the rail weighbridge 20, the weighing precision can be controlled within 3 per thousand, and the process batching requirement is met. During batching, the cooked pellets in the storage hopper 12 are conveyed into the hot material tank 18 through the discharging equipment 17, and the hot pellets are only conveyed once in the whole batching process, so that the heat loss is reduced, and the charging temperature of the pellets is improved. Finally, the prepared hot material tank 18 is transported to the submerged arc furnace workshop by a hot material tank truck 19, which is shown in figure 3.
The tail gas temperature of the waste heat utilization type shaft furnace 1 is about 140-. The auxiliary material system of preheating sets up two auxiliary material storehouses 24, and auxiliary material storehouse 24 carries out the material loading through loading attachment II 21 (chooseing for use the belt feeder usually), and auxiliary material storehouse 24 relies on weighing device 25 to realize accurate weighing, through weighing feedback signal adjustment frequency conversion belt feeder 27 rotational speed, makes the accurate transport of each batch to weighing conveyor 2 in. The hot flue gas of the waste heat utilization type shaft furnace 1 is firstly sucked into an auxiliary material bin 24 through a dust removal system 4, a heat exchange beam 26 is arranged in the auxiliary material bin 24, the hot flue gas passes through the heat exchange beam 26 and is sprayed into the auxiliary material bin 24 through an air outlet hole in the side wall of the heat exchange beam 26 to be used for drying and preheating the auxiliary material, and finally the flue gas is sent to the dust removal system 4 through a tail gas outlet pipeline of the auxiliary material bin 24 to be removed dust and then is discharged into the atmosphere, which is shown in the attached figure 4.
In the application, two auxiliary material bins 24 are arranged, each auxiliary material bin 24 can contain a plurality of batches of auxiliary materials, when one auxiliary material bin 24 is used for feeding materials through the belt conveyor 21, the corresponding feeding valve 22 is opened, the corresponding smoke inlet and outlet valve 23 of the auxiliary material bin is closed, and the auxiliary material bin 24 is not dried or preheated in the feeding process; the feeding valve 22 of the other auxiliary material bin 24 is closed, and the flue gas inlet valve 23 and the flue gas outlet valve 23 are opened, so that the auxiliary materials are dried and preheated.
The heat exchange beam 26 in the auxiliary material bin 24 is composed of a plurality of branch beams 29 and a middle connecting mechanism 28, one end of each branch beam 29 is welded with the bin wall of the auxiliary material bin 24, the bin wall at the welding position is provided with a hole to ensure that smoke can enter the branch beam 29 from the outer wall of the auxiliary material bin 24, the branch beam 29 is of a box-shaped beam structure, the side wall is provided with a plurality of small holes to disperse and guide out hot smoke, so that the hot smoke is in full contact with the auxiliary material in the auxiliary material bin 24 to carry out heat exchange, the aim of preheating the auxiliary material is fulfilled, and the possibility of blockage of the auxiliary material due to the holes in the side wall of the branch beam 29 can be reduced; the other end of the branch beam 29 is welded with the middle connecting mechanism 28, the middle connecting mechanism 28 connects the branch beams 29 to form the heat exchange beam 26 with a stable structure, the side wall and the top of the middle connecting mechanism 28 are provided with holes, the side wall holes are communicated with the branch beams 29, and finally, redundant hot smoke enters the auxiliary material bin from the holes reserved in the top of the middle connecting mechanism 28 to preheat the auxiliary material, see the attached drawing 5.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A rotary pelletizing shaft furnace waste heat utilization system is characterized by comprising:
the waste heat utilization type shaft furnace (1), the weighing and conveying device (2), the auxiliary material preheating system (3) and the dust removal system (4);
the waste heat utilization type shaft furnace (1) is used for roasting hot pellets;
the auxiliary material preheating system (3) is used for preheating the auxiliary material;
the weighing and conveying device (2) is used for conveying and discharging the preheated auxiliary materials by the auxiliary material preheating system (3);
the inlet end of the dust removal system (4) is communicated with a flue gas outlet after heat exchange of the auxiliary material preheating system (3);
a heat collecting device for collecting the heat of the exhaust gas discharged by the waste heat utilization type shaft furnace (1) is arranged at the exhaust gas outlet;
the first heat source of the auxiliary material preheating system (3) is a heat collecting device;
a weighing and conveying device (2) is arranged at the auxiliary material outlet of the auxiliary material preheating system (3);
qualified auxiliary materials preheated by the auxiliary material preheating system (3) are conveyed to the weighing and conveying device (2) according to the production process batching requirement for mixing, and the blanking amount of the waste heat utilization type shaft furnace (1) and the auxiliary material preheating system (3) is adjusted in real time according to the weighing module feedback signal of the weighing and conveying device (2), so that accurate batching is achieved.
2. The waste heat utilization system of the rotary pellet shaft furnace as claimed in claim 1, wherein,
the weighing and conveying device (2) conveys the mixture to a submerged arc furnace workshop in a rail transportation mode.
3. The system for utilizing the waste heat of the rotary pellet shaft furnace as claimed in claim 1 or 2,
the waste heat utilization type shaft furnace (1) comprises: the device comprises a feeding device I (5), a roasting chamber, a driving device (10), a material level detection device (11), a material storage hopper (12), a pneumatic valve (13), a pellet discharging device (14), a buffer bin (15), a burner (16) and discharging equipment (17);
when the waste heat utilization type shaft furnace (1) is produced, the green pellets are fed and conveyed into a roasting chamber through a feeding device I (5), and the roasting chamber comprises: an outer cylindrical sleeve (6), an inner cylindrical sleeve (7) and a material storage platform (9);
the outer cylindrical sleeve (6) and the inner cylindrical sleeve (7) are concentric, the center of the circle of the material storage platform (9) is offset by 50-70mm relative to the centers of the front two, and the eccentric amount can be automatically adjusted;
the material storage platform (9) makes rotary motion through a driving device (10), the material storage platform (9) can drive an outer cylindrical sleeve (6) and an inner cylindrical sleeve (7) to rotate together, blocking wheels (8) are arranged on the outer cylindrical sleeve (6) and the inner cylindrical sleeve (7) in the circumferential direction, and roasted cooked pellets fall into a shaft furnace material storage hopper (12) arranged below under the eccentric rotary action;
the lower part of a storage hopper (12) of the cooked pellet shaft furnace is periodically discharged through a discharging device (17) at the lower part of the storage hopper (12) of the pellet shaft furnace according to the production and batching requirements, a material level detection device (11) is arranged on the outer wall of the storage hopper (12), and the material level height is adjusted through a material level feedback signal;
the inlet end of the pellet discharging device (14) is communicated with the pellet stacking part of the pellet storage hopper (12) of the shaft furnace, the outlet end of the pellet discharging device (14) is communicated with the buffer bin (15), and the opening and closing of the pellet discharging device (14) are controlled by a valve (13);
the upper part of the pellet storage hopper (12) is a combustion chamber, and the burner (16) is arranged in the combustion chamber.
4. The waste heat utilization system of the rotary pellet shaft furnace as claimed in claim 3, wherein,
the gas used by the burner (16) is the gas of the ore-smelting furnace.
5. The system for utilizing the waste heat of the rotary pellet shaft furnace as claimed in claim 1 or 2,
the weighing and conveying device (2) comprises: the system comprises a hot material tank (18), a hot material tank car (19) for supporting and maintaining the hot material tank (18) and a track scale (20);
the weighing mode adopts a rail weighbridge (20), and a traveling rail for traveling of the hot material tank truck (19) is arranged above the rail weighbridge (20).
6. The system for utilizing the waste heat of the rotary pellet shaft furnace as claimed in claim 1 or 2,
the auxiliary material preheating system (3) comprises: the auxiliary material bin comprises a plurality of auxiliary material bins (24), a feeding device II (21) for adding auxiliary materials into the auxiliary material bins (24), a weighing device (25) for weighing the auxiliary material bins, and a variable frequency belt conveyor (27) which is arranged below the auxiliary material bins (24) and used for conveying the preheated auxiliary materials;
the auxiliary material bin (24) realizes accurate weighing by virtue of a weighing device (25), and the rotating speed of the variable frequency belt conveyor (27) is adjusted by a weighing feedback signal, so that each batch of materials is accurately conveyed to the weighing conveying device (2);
a plurality of heat exchange beams (26) are arranged in the auxiliary material bin (24), and the heat exchange beams (26) are arranged in an auxiliary material accumulation area at the lower part of the auxiliary material bin (24);
the heat collecting device collects hot flue gas of the waste heat utilization type shaft furnace (1) and finally guides the hot flue gas into a heat exchange beam (26) of an auxiliary material bin (24) through a pipeline, the hot flue gas penetrates through the heat exchange beam (26) and is sprayed into the auxiliary material bin (24) through a preset gas outlet hole in the side wall of the heat exchange beam (26) to be used for drying and preheating the auxiliary material, a tail gas outlet pipeline used for discharging internal gas is arranged on the auxiliary material bin (24), and the tail gas outlet pipeline is communicated with a dust removal system (4);
each auxiliary bin (24) is an independent feeding port, the feeding path is provided with an independent valve for controlling the on-off of the path, each auxiliary bin (24) is provided with an independent tail gas outlet pipeline, and each tail gas outlet pipeline is provided with a smoke inlet valve (23) and a smoke outlet valve (23) for controlling the on-off of the pipelines.
7. The waste heat utilization system of the rotary pellet shaft furnace as claimed in claim 6, wherein,
the heat exchange beam (26) includes: the auxiliary material preheating device comprises a branch beam (29) and an intermediate connecting mechanism (28), wherein one end of the branch beam (29) is fixed with the wall of the auxiliary material bin (24), the wall at the fixed position is provided with a hole to ensure that flue gas can enter the branch beam (29) from the outer wall of the auxiliary material bin (24), the branch beam (29) is of a box-shaped beam structure, and the side wall is provided with a plurality of small holes to disperse and guide hot flue gas out, so that the hot flue gas is in full contact with auxiliary materials in the auxiliary material bin (24) to carry out heat exchange, and the aim of auxiliary material preheating is fulfilled; the other end of the branch beam (29) is fixed with the middle connecting mechanism (28), the middle connecting mechanism (28) connects the branch beams (29) to form the heat exchange beam (26) with stable structure, the side wall and the top of the middle connecting mechanism (28) are provided with holes, the holes in the side wall are communicated with the branch beams (29), and finally, redundant hot smoke enters the auxiliary material bin from the top reserved hole of the middle connecting mechanism (28) to preheat the auxiliary material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202121496679.XU CN215373448U (en) | 2021-07-02 | 2021-07-02 | Waste heat utilization system of rotary pelletizing shaft furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121496679.XU CN215373448U (en) | 2021-07-02 | 2021-07-02 | Waste heat utilization system of rotary pelletizing shaft furnace |
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| CN215373448U true CN215373448U (en) | 2021-12-31 |
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| CN202121496679.XU Withdrawn - After Issue CN215373448U (en) | 2021-07-02 | 2021-07-02 | Waste heat utilization system of rotary pelletizing shaft furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432416A (en) * | 2021-07-02 | 2021-09-24 | 大连重工机电设备成套有限公司 | Waste heat utilization system of rotary pelletizing shaft furnace |
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2021
- 2021-07-02 CN CN202121496679.XU patent/CN215373448U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432416A (en) * | 2021-07-02 | 2021-09-24 | 大连重工机电设备成套有限公司 | Waste heat utilization system of rotary pelletizing shaft furnace |
| CN113432416B (en) * | 2021-07-02 | 2023-08-01 | 大连重工机电设备成套有限公司 | Rotary pellet shaft furnace waste heat utilization system |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20211231 Effective date of abandoning: 20230801 |
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| AV01 | Patent right actively abandoned |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |