CN218787710U - Iron ore sintering system for resource utilization of calcium-based solid waste - Google Patents
Iron ore sintering system for resource utilization of calcium-based solid waste Download PDFInfo
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- CN218787710U CN218787710U CN202222121420.8U CN202222121420U CN218787710U CN 218787710 U CN218787710 U CN 218787710U CN 202222121420 U CN202222121420 U CN 202222121420U CN 218787710 U CN218787710 U CN 218787710U
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Abstract
The utility model discloses an iron ore sintering system for resource utilization of calcium-based solid waste, which comprises a drying device, a drying hot air pipeline, a waste gas treatment flue, a belt sintering machine, an air inducing box and a hot air flue; a plurality of air guide boxes are uniformly arranged right below the length direction of the belt type sintering machine; the induced draft boxes positioned in the head and middle regions of the belt sintering machine are communicated with the waste gas treatment flue, and the induced draft box positioned at the tail of the belt sintering machine is communicated with one end of the hot air flue; the plurality of hot air drying pipelines are uniformly arranged in the length direction of the drying device and are communicated with the other end of the hot air flue; the high-temperature flue gas at the tail part of the belt sintering machine provides hot air for the drying device through the air guide box, the hot air flue and the drying hot air pipeline, and the waste heat of the sintering flue gas is fully utilized. The utility model discloses a calcium base solid waste's batch innocent treatment, the triple purpose of sintering flue gas waste heat utilization and reduction limestone quantity.
Description
Technical Field
The utility model relates to an iron ore sintering field and solid waste handle field especially relate to a resource utilization calcium base solid waste's iron ore sintering system.
Background
The BF-BOF (blast furnace-converter) route is currently the most dominant route for the production of crude steel worldwide. Blast furnace smelting has strict requirements on the characteristics of the raw materials entering the furnace, such as particle size, strength and the like, and the qualified sintered ore blocks produced by an iron ore sintering method are commonly used as the raw materials entering the furnace of the blast furnace in industrial production. The iron ore sintering process generally proceeds by mixing mined iron ore powder or granules with fuel and flux and then adding a quantity of water to pelletize in a drum. And filling the granulated raw materials into a sintering machine, igniting the upper layer of the sintered material packed bed by an igniter, burning a flame layer from top to bottom under the action of bottom air induction, and cooling to form block-shaped sintered ores. The iron ore sintering process mainly depends on Fe2O3, siO2 and CaO, and a multi-element eutectic system containing a small amount of MgO, al2O3 and other substances bonds and agglomerates particles in a molten phase formed at high temperature to form a sintered ore, wherein the CaO is mainly provided by a fluxing agent, and other main phases are also regulated by the addition of the fluxing agent. Therefore, the kind and amount of the flux are very important for the yield and strength of the sintered ore.
The flux for providing CaO in the current sintering process is mainly mined limestone minerals. Many industrial processes produce solid waste with high calcium content. Taking white mud produced in the paper industry as an example, the content of CaCO3 reaches about 90 percent, and in addition, siO2, mgO, al2O3 and the like contained in the white mud can also play a role in adjusting the liquid phase generation characteristic of a sintering mixture and influence the metallurgical characteristic of a sintering ore to a certain extent.
At present, the prior art for resource utilization of calcium-based solid wastes is mainly in the fields of flue gas desulfurization and building material production, and the utilization effect is considerable. However, in view of the current utilization state, calcium-based solid waste in many areas is not effectively treated, and the existing utilization techniques and approaches obviously cannot cover the generation amount of the calcium-based solid waste.
In the technical field of coupling waste treatment in the iron ore sintering process, the prior art comprises the treatment of various types of solid waste. Many existing technologies only add materials to be processed into the sintering mixture, and do not make much use of other advantages of the sintering process, such as residual heat of flue gas; in some treatment technologies, the waste heat of sintering flue gas is used for drying, but the temperature and the components of the sintering flue gas have great fluctuation, the temperature of the flue gas at the head of the sintering machine is low, the water vapor content is high, and the drying effect may be poor; and the dried material is not effectively utilized in the sintering process.
SUMMERY OF THE UTILITY MODEL
To the not enough of prior art, the utility model provides a resource utilization calcium base solid waste's iron ore sintering system.
The utility model discloses a realize through following technical scheme:
an iron ore sintering system for resource utilization of calcium-based solid wastes comprises a drying device, a drying hot air pipeline, a crushing device, a waste gas treatment flue, an iron ore sintering raw material feeding device, a mixing and granulating device, a distributing device, an ignition nozzle, a belt type sintering machine, an air introducing box and a hot air flue;
the tail part of the drying device is communicated with the crushing device; the crushing device, the iron ore sintering raw material feeding device, the mixing and granulating device and the distributing device are used for conveying materials through a conveying belt; the tail part of the distributing device is arranged above the head part of the strand sintering machine, and the ignition nozzle is arranged above the head part of the strand sintering machine;
the plurality of air guide boxes are uniformly arranged right below the length direction of the belt type sintering machine; the air inducing boxes positioned in the head and middle areas of the straight sintering machine are communicated with the waste gas treatment flue; an induced draft box positioned at the tail part of the belt type sintering machine is communicated with one end of a hot air flue;
the drying hot air pipelines are multiple and are uniformly arranged in the length direction of the drying device; the drying hot air pipeline is communicated with the other end of the hot air flue;
and the air outlet of the drying device is communicated with the waste gas treatment flue.
Furthermore, the drying device is connected with the drying hot air pipeline, the drying hot air pipeline is connected with the hot air flue, and the hot air flue is connected with the induced draft box through common welding or flange pipes.
Further, the drying device transports materials through a conveyor belt.
Furthermore, the air outlet of the drying device is positioned above the tail part of the conveying belt in the drying device.
Compared with the prior art, the utility model discloses the innovation part and the beneficial effect that possess are:
(1) The utility model provides a flue system with different regional flue gas of sintering machine are collected respectively and are utilized collects the high temperature of sintering machine afterbody and the flue gas that vapor content is low relatively and collects as drying device's hot-blast in order to realize the drying to required solid waste, has realized the purpose of make full use of sintering flue gas waste heat.
(2) The utility model provides a with drying device and sintering machine combined use's process systems, realized flue gas waste heat and solid waste's utilization in coordination in same system, realized calcium base solid waste's harmless treatment in batches.
Drawings
FIG. 1 is a flow chart of a white mud drying system coupled with iron ore sintering.
Description of reference numerals: the device comprises a drying device 1, a drying hot air pipeline 2, a crushing device 3, a waste gas treatment flue 4, an iron ore sintering raw material feeding device 5, a mixing and granulating device 6, a distributing device 7, an ignition nozzle 8, a belt sintering machine 9, an induced draft box 10 and a hot air flue 11.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the purpose and effect of the present invention will become more apparent, and the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, an iron ore sintering system for resource utilization of calcium-based solid waste comprises a drying device 1, a drying hot air pipeline 2, a crushing device 3, a waste gas treatment flue 4, an iron ore sintering raw material feeding device 5, a mixing and granulating device 6, a distributing device 7, an ignition nozzle 8, a belt sintering machine 9, an induced draft box 10 and a hot air flue 11;
the tail part of the drying device 1 is communicated with the crushing device 3; materials are conveyed among the crushing device 3, the iron ore sintering raw material feeding device 5, the mixing and granulating device 6 and the distributing device 7 through a conveying belt; the tail part of the distributing device 7 is arranged above the head part of the belt sintering machine 9, and the ignition nozzle 8 is arranged above the head part of the belt sintering machine 9;
a plurality of air inducing boxes 10 are uniformly arranged right below the length direction of the belt type sintering machine 9; the induced draft boxes 10 positioned in the head and middle regions of the strand sintering machine 9 are communicated with the waste gas treatment flue 4; an induced draft box 10 positioned at the tail part of the belt sintering machine 9 is communicated with one end of a hot air flue 11; a plurality of drying hot air pipelines 2 are uniformly arranged in the length direction of the drying device 1; the drying hot air pipeline 2 is communicated with the other end of the hot air flue 11; the drying device 1 is connected with the drying hot air pipeline 2, the drying hot air pipeline 2 is connected with the hot air flue 11, and the hot air flue 11 is connected with the induced draft box 10 by common welding or flange pipes.
The drying device 1 transports materials through a conveyor belt, the air outlet of the drying device 1 is located above the tail part of the conveyor belt, and the air outlet is communicated with the waste gas treatment flue 4.
The drying device 1 is provided with a calcium-based solid waste feeding port, and in this embodiment, the calcium-based solid waste is preferably white mud of a paper mill; white mud in a paper mill enters a drying device 1 and is dried by hot air provided by a hot air drying pipeline 2; the dried white mud of the paper mill enters a crushing device 3 to be crushed into powder and small particles, and enters a mixing and granulating device 6 together with other sintering raw materials from an iron ore sintering raw material feeding device 5 through a conveyor belt; the mixture after granulation enters a distributing device 7 through a conveyor belt, and the mixture reaches a belt sintering machine 9 from an outlet of the distributing device 7 to complete distribution on the belt sintering machine 9; the distributed material moves forward on the belt sintering machine 9, is ignited on the surface layer of the packed bed by the ignition nozzle 8, and gradually finishes sintering under the suction action of the induced draft box 10; the flue gas with high water content and low temperature generated at the head and the middle of the strand sintering machine 9 is discharged through an air inducing box 10 positioned right below the head and the middle area of the strand sintering machine 9, and is discharged through a waste gas treatment flue 4 together with the flue gas discharged by the drying device 1, and the flue gas purification treatment is carried out; the high-temperature flue gas at the tail part of the strand sintering machine 9 passes through an air guide box 10, a hot air flue 11 and a drying hot air pipeline 2 which are positioned right below the tail part of the strand sintering machine 9 to provide hot air for the drying device 1 for drying.
Taking the white mud of a paper mill as an example, the specific operation process of the iron ore sintering system for resource utilization of the calcium-based solid waste is as follows:
step one, taking a small amount of white mud samples from a paper mill, drying the white mud samples, and testing and analyzing the content of each component (including but not limited to moisture, caCO3, siO2, mgO, al2O3, feO content and total iron content) in the white mud samples.
And step two, combining other sintering raw materials, and calculating a sintering burdening table with the binary alkalinity (the mass ratio of CaO to SiO 2) of 1.9, the coke content of 4.5 percent and the MgO content of 1.7 percent on a dry basis. (the contents are dry basis mass fraction)
Get drying device 1 in this embodiment and be belt dryer, according to the lime mud water content and the lime mud demand that obtain before, set for belt dryer feed volume and functioning speed, set well the feed volume of other sintering raw materials simultaneously.
And step three, feeding the white mud of the paper mill into a drying device 1 in batches, drying the white mud through a drying hot air pipeline 2 by using high-temperature flue gas at the tail part of a belt type sintering machine 9, feeding the dried white mud into a crushing device 3 to be crushed into powder and small particles, and feeding other sintering raw materials from an iron ore sintering raw material feeding device 5 into a mixing and granulating device 6 through a conveyor belt.
And step four, calculating the water amount required to be supplemented under the condition that the target total water content is 6.5% according to the measured water content of each raw material, adding water into the granulating device 6, and completing rotary granulation.
And step five, feeding the granulated raw materials into a material distribution device 7 through a conveyor belt, wherein the material distribution device 7 forms a packed bed on a belt sintering machine 9, and the material distribution is completed by taking the packed bed with the height of 650mm as an example.
And step six, the distributed materials move forwards on the belt type sintering machine 9, the moving speed of the conveyor belt is set, and the time from the ignition range of the bed materials entering the ignition nozzle 8 to the time of leaving the bed materials is ensured to be about 90s. The negative pressure of the induction box 10 below the ignition nozzle 8 was set at 6kPa, and the negative pressure of the induction box 10 after that was set at 16kPa. The raw materials run forward on the belt sintering machine 9 to complete the sintering step by step.
And step seven, the flue gas with high water content and low temperature generated at the head and the middle part of the sintering machine 9 and the flue gas discharged by the drying device 1 enter the waste gas treatment flue 4 together for flue gas purification treatment.
Eighthly, the temperature of the flue gas in the induced draft box 10 at the tail part of the sintering machine 9 can reach about 150-200 ℃, and the high-temperature flue gas is conveyed to the drying device 1 through the induced draft box 10, the hot air flue 11 and the drying hot air pipeline 2 to be used as a heat source for drying the white mud.
Therefore, the white mud of the paper mill is dried by the sintering flue gas of the iron ore, and the dried white mud is partially used for replacing limestone to serve as the sintering raw material of the iron ore, so that the resource utilization of the waste heat of the white mud and the sintering flue gas of the paper mill is realized.
This example presents a method for the comprehensive utilization of calcium-based solid waste in the iron ore sintering process. Taking the white mud of the paper mill as an example, the white mud of the paper mill is dried by collecting high-temperature flue gas at the tail part of a sintering machine by adopting an induced draft box separated from the front part and the rear part, so that the white mud of the paper mill is fully utilizedThe residual heat of the sintering flue gas. And crushing the dried white mud (if the white mud is obviously caked), adding the processed white mud serving as a fluxing agent in a sintering raw material into a mixture according to a required mixing proportion for granulation, and then sintering. And simultaneously, the three purposes of batch harmless treatment of white mud in a paper mill, utilization of waste heat of sintering flue gas and reduction of the using amount of limestone are realized. And CaCO in papermaking white mud 3 Up to 90% by weight of SiO 2 MgO and Al 2 O 3 And other main components can play respective positive roles in the sintering process, and the quality and the yield of the sintered ore are basically not influenced.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention and is not intended to limit the same, and although the invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that various changes in the form and details of the invention may be made and equivalents may be substituted for elements thereof. All modifications and equivalents made within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (4)
1. An iron ore sintering system for resource utilization of calcium-based solid wastes is characterized by comprising a drying device (1), a drying hot air pipeline (2), a crushing device (3), a waste gas treatment flue (4), an iron ore sintering raw material feeding device (5), a mixing and granulating device (6), a distributing device (7), an ignition nozzle (8), a belt type sintering machine (9), an air introducing box (10) and a hot air flue (11);
the tail part of the drying device (1) is communicated with the crushing device (3); materials are conveyed among the crushing device (3), the iron ore sintering raw material feeding device (5), the mixing and granulating device (6) and the distributing device (7) through a conveying belt; the tail part of the distributing device (7) is arranged above the head part of the sintering belt (9), and the ignition nozzle (8) is arranged above the head part of the sintering belt (9);
the air guide boxes (10) are uniformly arranged right below the length direction of the strand sintering machine (9); the air inducing boxes (10) positioned at the head and the middle area of the straight sintering machine (9) are communicated with the waste gas treatment flue (4); an air inducing box (10) positioned at the tail part of the belt type sintering machine (9) is communicated with one end of a hot air flue (11);
the drying hot air pipelines (2) are multiple and are uniformly arranged in the length direction of the drying device (1); the drying hot air pipeline (2) is communicated with the other end of the hot air flue (11);
and the air outlet of the drying device (1) is communicated with the waste gas treatment flue (4).
2. The iron ore sintering system for resource utilization of calcium-based solid wastes according to claim 1, wherein the drying device (1) is connected with the drying hot air duct (2), the drying hot air duct (2) is connected with the hot air flue (11), and the hot air flue (11) is connected with the air inducing box (10) by common welding or flange pipes.
3. A resource utilization iron ore sintering system for calcium-based solid wastes according to claim 1, characterized in that the drying device (1) internally transports materials by a conveyor belt.
4. A resource utilization iron ore sintering system for calcium-based solid wastes according to claim 3, characterized in that the air outlet of the drying device (1) is positioned above the tail part of the internal conveyor belt.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222121420.8U CN218787710U (en) | 2022-08-12 | 2022-08-12 | Iron ore sintering system for resource utilization of calcium-based solid waste |
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| CN202222121420.8U CN218787710U (en) | 2022-08-12 | 2022-08-12 | Iron ore sintering system for resource utilization of calcium-based solid waste |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116447856A (en) * | 2023-06-09 | 2023-07-18 | 盛胜电子科技(广州)有限公司 | Container type coal low-temperature dryer and drying method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116447856A (en) * | 2023-06-09 | 2023-07-18 | 盛胜电子科技(广州)有限公司 | Container type coal low-temperature dryer and drying method |
| CN116447856B (en) * | 2023-06-09 | 2024-05-07 | 盛胜电子科技(广州)有限公司 | Container type coal low-temperature dryer and drying method |
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