CN109402383B - Method and device for optimizing sintering moisture - Google Patents
Method and device for optimizing sintering moisture Download PDFInfo
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- CN109402383B CN109402383B CN201811598235.XA CN201811598235A CN109402383B CN 109402383 B CN109402383 B CN 109402383B CN 201811598235 A CN201811598235 A CN 201811598235A CN 109402383 B CN109402383 B CN 109402383B
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Abstract
The invention provides a method and a device for optimizing sintering moisture. The invention provides a method and a device for optimizing sintering moisture, and aims to preheat a mixture by cooling waste flue gas, properly reduce moisture added by uniform mixing and granulation, and reduce over-humidity in a sintering process, so that the sintering speed of materials in the sintering process is increased, and the effect of sintering and yield improvement is achieved. The steam generated by preheating the material by the waste gas is introduced to the sinter bed by the ejector to spray the steam on the charge surface. Finally, the process realizes sintering yield improvement by optimizing the reasonable distribution of water in the sintering process.
Description
Technical Field
The invention belongs to the field of sintering, and particularly relates to a method and a device for optimizing sintering moisture.
Background
The iron ore powder sintering process is a process of adding flux and fuel into fine ore or fine powder and sintering the fine ore or fine powder into ore; in the process, mixing and granulating are a key part, various fine materials are mixed and granulated into quasi-granular pellets in a mixer, and then sintering is carried out; the amount of the small balls and the proportion of 3mm represents the quality of a granulating effect and a good pelletizing effect, and is beneficial to improving the air permeability of a mixed material layer on a sintering trolley, so that the sintering speed and the yield of a sintering machine can be improved. With regard to the improvement of the granulation effect, conventionally, various measures have been taken, such as optimizing the water distribution (see fig. 1), changing the filling rate and the rotational speed of the mixer, using a forced mixing device or a pelletizing disk, and the like. In the aspect of water distribution, generally speaking, the mixture water distribution and the material layer air permeability are in an inverted V-shaped relationship; properly increasing the moisture content helps to improve the quality of balling during the two-step mixing process and increase the air permeability of the material layer, but too high moisture content deteriorates the air permeability. With the application of the current thick-bed technology, in order to prevent the bed from being too wet, the optimal water distribution amount is generally lower in the aspect of water distribution. If the optimal water distribution amount of the mixture is 7.5 percent, the water distribution is about 7.0 percent in practice.
Aiming at the problems of water distribution and addition in the traditional sintering process and overhumidity of the current thick material layer, the invention provides a thought of properly reducing water content by preheating the mixture through cooling waste flue gas, and overcomes the contradiction between water consumption for uniform mixing and granulation and sintering air permeability, thereby improving the sintering speed of the material in the sintering process and achieving the effect of sintering and yield improvement.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method and a device for optimizing sintering moisture. The steam generated by preheating the material by the waste gas is introduced to the sinter bed by the ejector to spray the steam on the charge surface. Finally, the process realizes sintering yield improvement by optimizing the reasonable distribution of water in the sintering process.
The technical scheme adopted by the invention is as follows: a device for optimizing sintering moisture comprises a distributing ore tank, a sintering machine and a circular cooler for cooling sintering ore, wherein the distributing ore tank, the sintering machine and the circular cooler are sequentially connected through conveying equipment; the device also comprises an ejector and an induced draft fan, wherein the air inlet of the ejector is connected with the material distribution ore tank, and the air outlet of the ejector is arranged above the material distribution layer in the sintering machine; the air inlet of the draught fan is connected with the tail end of the circular cooler, and the air outlet of the draught fan is connected with the distributing ore tank. A method of optimizing sinter moisture, the method comprising: the device for optimizing sintering moisture is applied, and specifically comprises the following components: and introducing waste gas at the tail end of the circular cooler to a distributing ore tank through an induced draft fan and preheating the pre-sintered mixture in the distributing ore tank, uniformly distributing the preheated pre-sintered mixture to a sintering trolley through the distributing ore tank, introducing steam generated by preheating the waste gas mixture to a distributing layer in the sintering trolley through an ejector, wherein the thickness of the distributing layer is 500-1000 mm. Wherein the conveying device is a device commonly used in the art, such as a belt conveyor or a screw conveyor.
In order to reduce the water content of the presintered mixture in the distributing ore tank and increase the air permeability of the material layer on the premise of ensuring the granulating effect, the presintered mixture in the distributing ore tank is further prepared by the following method: firstly, weighing sintering raw material components in a batching chamber, then conveying the sintering raw material components to a primary cylinder mixer through conveying equipment, uniformly mixing and wetting, then conveying the sintering raw material components to a secondary cylinder mixer through the conveying equipment, uniformly mixing and granulating, and then conveying the sintering raw material components to a distributing ore tank through the conveying equipment; the mixing and granulating are completed under the condition that the water content of the materials is 7.5-8%.
The method and the device for optimizing the sintering moisture have the advantages that: 1. the pelletizing quality can be ensured by improving the water amount in the secondary mixing process. 2. The waste gas at the tail end of the circular cooler is used for heating the mixture, so that the water content of the mixture which is distributed to the trolley through the distributing ore tank after the secondary mixing is reduced to 6.0-6.5 percent, thereby not only preheating the sintering material, but also ensuring the integrity of small balls, avoiding the material from being over-wet, optimizing the air permeability of the distributing layer on the whole, effectively improving the sintering speed and increasing the sintering yield and the sintering quality; 3. the process of preheating the sintering material by adding steam into the material distribution ore tank in the traditional sintering water distribution process is omitted, and the phenomenon that the air permeability of the material layer is influenced by the overhigh humidity of the sintering material is also avoided; 4. the steam generated by preheating the mixture in the distributing ore tank is sprayed into the ignited sinter bed in a mapping way, so that the sintering thickness of the sinter bed can be improved, and the sintering quality and the sintering speed can be ensured. 5. Waste gas preheats the produced high temperature section waste gas steam of mixture at cloth ore deposit groove, can send into the pipe network and realize the effective utilization of resource.
Drawings
FIG. 1 is a flow chart of a conventional sintering water distribution process in comparative example 1.
FIG. 2 is a view showing an apparatus for optimizing moisture in sintering according to example 1 of the present invention.
Fig. 3 is a schematic process flow diagram of a method for optimizing sintering moisture according to example 1 of the present invention.
In the figure: 1. the system comprises a batching chamber, 2 parts of a primary cylinder mixer, 3 parts of a secondary cylinder mixer, 4 parts of a distributing ore tank, 5 parts of a sintering machine, 6 parts of a circular cooler, 7 parts of a three-dimensional vibrating screen, 8 parts of an ejector and 9 parts of a draught fan.
Detailed Description
The invention is described in more detail below with reference to the following examples:
example 1:
referring to fig. 2 and 3, the device for optimizing sintering moisture comprises a batching chamber 1, a primary cylinder mixer 2, a secondary cylinder mixer 3, a distributing ore tank 4, a sintering machine 5, a circular cooler 6, a three-dimensional vibrating screen 7, an ejector 8 and a draught fan 9 which are sequentially connected, wherein an air inlet of the ejector is connected with the distributing ore tank, and an air outlet of the ejector is arranged above a distributing layer in the sintering machine; the air inlet of the draught fan is connected with the waste gas port at the tail end of the circular cooler, and the air outlet of the draught fan is connected with the distributing ore groove.
Based on the device for optimizing sintering moisture, the method for optimizing sintering moisture comprises the steps of material proportioning, uniform mixing and granulation, preheating and material distribution, ignition and sintering, cooling and screening. The purpose is to preheat the mixture by cooling the waste flue gas, properly reduce the moisture added by uniform mixing granulation, and reduce the over-wetting in the sintering process, thereby improving the sintering speed of the material in the sintering process and playing the effect of sintering and increasing the yield. The steam generated by preheating the material by the waste gas is introduced to the sinter bed by the ejector to spray the steam on the charge surface. Finally, the process realizes sintering yield improvement by optimizing the reasonable distribution of water in the sintering process.
The specific steps for optimizing sintering moisture are as follows:
(1) burdening in a burdening chamber:
weighing the following raw material components (in percentage by mass) in a batching chamber: the proportion of iron ore powder is 60%, the proportion of quicklime is 5%, the proportion of limestone is 2%, the proportion of dolomite is 6%, the proportion of fuel (coke powder is selected in the embodiment) is 4%, and the proportion of return fines is 23%, and then the raw material components are conveyed to a primary drum mixer through conveying equipment such as a belt or a screw conveyer.
(2) Mixing and granulating to prepare a pre-sintered mixture:
mixing and wetting (namely, primary mixing) the raw material components conveyed to the primary cylinder mixer, then conveying the raw material components to the secondary cylinder mixer for mixing and granulating (namely, secondary mixing) to obtain a pre-sintered mixture, controlling the mass content of water in the mixture to be 7.2% after the primary cylinder mixer is subjected to primary mixing, controlling the mass content of water in the mixture to be 8.0% after the secondary cylinder mixer is subjected to secondary mixing, and controlling the granulating time of the primary cylinder mixer and the granulating time of the secondary cylinder mixer to be 2min and 4min respectively.
(3) Preheating and distributing a distributing ore tank:
and (3) conveying the mixture prepared in the step (2) to a material distribution ore tank, wherein no steam is added in the material distribution ore tank. Then exhaust air at the tail end of the circular cooler is induced into the material distribution ore tank through an induced draft fan and preheats the mixture in the material distribution ore tank, the exhaust air exchanges heat with the mixture, and the moisture of the preheated mixture which is distributed on the trolley and is presintered is controlled to be reduced to 6.0-6.5%; steam generated by heat exchange is brought to the sintering machine through the ejector to be ignited and is sprayed into a sintering material layer from the material surface of the sintering machine; the material distribution thickness of the material distribution ore tank in the sintering machine is controlled to be 800 mm.
(4) Ignition and sintering:
controlling the ignition temperature of the sintering machine to be 1100 ℃, the ignition time to be 1min and the ignition negative pressure to be 10000 Pa; the sintering negative pressure after ignition is controlled to be 12000 Pa.
(5) Cooling and sieving: the temperature of the sinter is reduced to below 200 ℃ by a circular cooler by adopting any on-machine cooling or off-machine cooling mode.
And screening the cooled sintered ore by using a vibrating screen with 5mm screen holes by using the tertiary screen, wherein the undersize is sintered return ore, and the oversize is finished sintered ore and is conveyed to a blast furnace.
Comparative example 1:
referring to fig. 1, the water distribution process based on the traditional sintering mainly comprises the following steps:
(1) batching chamber batching (same batching method as in example 1):
weighing the following components: the proportion of iron ore powder is 60%, the proportion of quicklime is 5%, the proportion of limestone is 2%, the proportion of dolomite is 6%, the proportion of fuel is 4% and the proportion of return fines is 23%.
(2) Mixing and granulating:
the weighed raw material components are respectively mixed and granulated by a primary cylinder mixer and a secondary cylinder mixer, the water content is controlled to be 7.0% after the primary cylinder mixer is used for mixing, the water content in the mixture is controlled to be 7.5% after the secondary cylinder mixer is used for mixing (in the traditional sintering process, because the material layer is prevented from being too wet, the water distribution after the secondary mixing is generally not more than 8%), and the granulating time of the primary cylinder mixer and the secondary cylinder mixer is respectively controlled for 2min and 4 min.
(3) Preheating and distributing:
the mixture in the distributing ore tank has no other preheating measures, and only steam is added in the distributing ore tank. Therefore, after the mixture is distributed on the trolley, the moisture of the mixture is slightly higher than that of the mixture after the mixture is mixed by 7.5 percent, and the thickness of the distributed material is controlled to be 800 mm.
(4) Ignition and sintering:
controlling the ignition temperature of the sintering machine to be 1100 ℃, the ignition time to be 1min and the ignition negative pressure to be 10000 Pa; the sintering negative pressure after ignition is controlled to be 12000 Pa.
(5) Cooling and sieving: reducing the temperature of the sinter to below 200 ℃ by using any on-machine cooling or off-machine cooling mode through a circular cooler; and screening the cooled sintered ore by using a vibrating screen with 5mm screen holes by using the tertiary screen, wherein the undersize is sintered return ore, and the oversize is finished sintered ore and is conveyed to a blast furnace.
In the new sintering process, the mixture is preheated by using the annular cooling waste gas, so that the moisture vapor of the sintered mixture is reduced by about 1.5%, and the sintering and pelletizing effects are not influenced. The temperature of the fabric on one side is increased; on the other hand, after the water content of the mixture is reduced, the over-wetting phenomenon can be relieved to a greater extent. Finally, the sintering gas permeability and the sintering yield are improved (after a plurality of comparison tests, compared with the comparison example 1, the sintering yield can be improved by about 8% in the example 1, and raw materials adopted in each comparison test are the same batch). The steam generated by heat exchange is injected into the sinter bed, can participate in the combustion reaction of carbon, and is helpful for improving the combustion efficiency of fuel and reducing pollutant emission.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (3)
1. An apparatus for optimizing sinter moisture, comprising: the device comprises a distributing ore tank, a sintering machine and a circular cooler for cooling sintered ore materials, which are sequentially connected through conveying equipment; the device also comprises an ejector and an induced draft fan, wherein the air inlet of the ejector is connected with the material distribution ore tank, and the air outlet of the ejector is arranged above the material distribution layer in the sintering machine; the air inlet of the draught fan is connected with the tail end of the circular cooler, and the air outlet of the draught fan is connected with the distributing ore tank.
2. The method for optimizing sintering moisture based on the apparatus for optimizing sintering moisture according to claim 1, characterized in that: the method comprises the following steps: and introducing waste gas at the tail end of the circular cooler to a distributing ore tank through an induced draft fan, preheating the pre-sintered mixture in the distributing ore tank, uniformly distributing the preheated pre-sintered mixture to a sintering trolley through the distributing ore tank, introducing steam generated by preheating the waste gas mixture to a distributing layer in the sintering trolley through an ejector, wherein the thickness of the distributing layer is 500-1000 mm.
3. The method of optimizing sinter moisture as claimed in claim 2, wherein: the pre-sintered mixture in the distributing ore tank is prepared by the following method: firstly, weighing sintering raw material components in a batching chamber, then conveying the sintering raw material components to a primary cylinder mixer through conveying equipment, uniformly mixing and wetting, then conveying the sintering raw material components to a secondary cylinder mixer through the conveying equipment, uniformly mixing and granulating, and then conveying the sintering raw material components to a distributing ore tank through the conveying equipment; the mixing and granulating are completed under the condition that the water content of the materials is 7.5-8%.
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| CN103484661A (en) * | 2013-09-13 | 2014-01-01 | 中南大学 | Method for enhancing sintering of high-proportion limonite by utilization of waste heat of exhaust gas |
| CN103614549A (en) * | 2013-12-11 | 2014-03-05 | 武钢集团昆明钢铁股份有限公司 | Micro-power hot air preheating method and device for sintering secondary mixture |
| CN109055730A (en) * | 2018-09-25 | 2018-12-21 | 湖南华菱湘潭钢铁有限公司 | The method of steel works sintering preheating of mixed material |
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- 2018-12-26 CN CN201811598235.XA patent/CN109402383B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0792349B2 (en) * | 1990-11-13 | 1995-10-09 | 新日本製鐵株式会社 | Exhaust heat recovery method of sintering machine |
| CN2499406Y (en) * | 2001-09-07 | 2002-07-10 | 邯郸钢铁股份有限公司 | Preheating mixed material device by directly using industrial hot waste gas |
| CN103320605A (en) * | 2013-06-25 | 2013-09-25 | 攀钢集团攀枝花钢钒有限公司 | Sintering method and sintering equipment of iron ore |
| CN103484661A (en) * | 2013-09-13 | 2014-01-01 | 中南大学 | Method for enhancing sintering of high-proportion limonite by utilization of waste heat of exhaust gas |
| CN103614549A (en) * | 2013-12-11 | 2014-03-05 | 武钢集团昆明钢铁股份有限公司 | Micro-power hot air preheating method and device for sintering secondary mixture |
| CN109055730A (en) * | 2018-09-25 | 2018-12-21 | 湖南华菱湘潭钢铁有限公司 | The method of steel works sintering preheating of mixed material |
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