CN211003567U - Feeding and conveying device for smelting reduction furnace - Google Patents
Feeding and conveying device for smelting reduction furnace Download PDFInfo
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- CN211003567U CN211003567U CN201922067264.XU CN201922067264U CN211003567U CN 211003567 U CN211003567 U CN 211003567U CN 201922067264 U CN201922067264 U CN 201922067264U CN 211003567 U CN211003567 U CN 211003567U
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Abstract
The utility model provides a feed conveyor for smelting reduction furnace, includes hot ore bin (1), intermediate tank (2), jetting jar (3), screw feeder (4), quick lime powder storehouse (5), rotary feeder (6), dry coal bunker (7), conveying line (8), the export in hot ore bin (1) loops through intermediate tank (2), jetting jar (3), screw feeder (4) is connected to conveying line (8), the export in quick lime powder storehouse (5) loops through intermediate tank (2), jetting jar (3), rotary feeder (6) is connected to conveying line (8), the export in dry coal bunker (7) loops through intermediate tank (2), jetting jar (3), rotary feeder (6) is connected to conveying line (8).
Description
Technical Field
The utility model relates to a feed conveyor for dust feed conveying system, especially a feed conveyor for smelting reduction furnace.
Background
The blast furnace coal injection technology is generally applied in China, more and more blast furnaces adopt the coal injection technology, and the blast furnace coal injection technology in China are developed to a higher level. At present, the state requires that a coal injection system must be arranged in a newly built or modified blast furnace. At present, the blast furnace process only has a coal injection system, but the coal injection system and an ore injection system are required on the smelting reduction furnace. In addition, the whole injection system is still imperfect in technology, powder cannot be normally fed, and the problems of material blockage, unsmooth blanking, wrong powder sequential control, inaccurate powder supply and the like exist. How to better realize the positive production supply of powder becomes a problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a system and a method for carrying out mixed injection on a smelting reduction furnace.
In order to solve the technical problem, the utility model discloses a technical scheme as follows:
the utility model provides a feed conveyor for smelting reduction furnace, includes hot ore bin (1), intermediate tank (2), jetting jar (3), screw feeder (4), quick lime powder storehouse (5), rotary feeder (6), dry coal bunker (7), conveying line (8), the export in hot ore bin (1) loops through intermediate tank (2), jetting jar (3), screw feeder (4) is connected to conveying line (8), the export in quick lime powder storehouse (5) loops through intermediate tank (2), jetting jar (3), rotary feeder (6) is connected to conveying line (8), the export in dry coal bunker (7) loops through intermediate tank (2), jetting jar (3), rotary feeder (6) is connected to conveying line (8).
Furthermore, the hot ore bin (1) adopts 2 sets of tank stringing systems, and 2 outlets of the hot ore bin tank stringing system are respectively and sequentially connected with the intermediate tank, the blowing tank, the screw feeder (4) and the conveying pipeline (8).
Furthermore, the quicklime powder bin (5) adopts 2 sets of tank stringing systems, and 2 outlets of the quicklime powder tank stringing systems are respectively and sequentially connected with the intermediate tank, the blowing tank, the rotary feeder (6) and the conveying pipeline (8) through 2.
Furthermore, the dry coal bunker (7) adopts 4 sets of tank stringing systems, and 4 outlets of the dry coal bunker tank stringing systems are respectively and sequentially connected with the intermediate tank, the blowing tank, the rotary feeder (6) and the conveying pipeline (8) through 4 pipelines.
Furthermore, the conveying pipelines of the hot ore bin (1), the quicklime powder bin (5) and the dry coal bin (7) are finally converged into 2 pipelines and are injected into the smelting reduction furnace through two spray guns.
Further, a method for feeding by using the system is provided, wherein pulverized coal is fed by a dry coal bunker, a middle tank and a blowing tank, and a rotary feeder; feeding quicklime powder through a lime powder bin, an intermediate tank and a blowing tank, feeding by a rotary feeder, and accessing two pulverized coal blowing pipelines nearby; feeding iron ore powder and dolomite powder through a hot ore bin, an intermediate tank and a blowing tank, feeding by a screw feeder, wherein the materials in the hot ore bin are iron ore powder and dolomite mixture, nitrogen is used as carrier gas to join hot ore, coal powder and quicklime pipelines before entering a spray gun, and finally the blowing pipeline is joined into two pipelines in front of the furnace, so that the mixture of the iron ore powder, the dolomite, the quicklime powder and the coal powder is conveyed to the front of the furnace and is sprayed into a smelting reduction furnace through two spray guns.
Furthermore, the coal powder in the dry coal bunker is dry pulverized coal after drying and crushing, the water content of the dry pulverized coal is less than or equal to 2 percent, the ash content of the dry pulverized coal is 10-15 percent, the sulfur content is less than or equal to 0.6 percent, the volatile matter is 7-9 percent, the fixed carbon is 73-83 percent, the Haw's grindability coefficient is more than or equal to 30, and the granularity is less than or equal to 33 mm; the method comprises the steps of firstly storing dry coal powder with the volume of more than 80% in a dry coal bin, enabling the dry coal powder to enter a middle tank from the dry coal powder bin in a single injection system in a gravity automatic feeding mode, closing a discharging ball valve when the middle tank is full, then feeding the middle tank to an injection tank, conveying the dry coal powder to the injection tank from the middle tank through nitrogen pressurization, fluidization and pressure balance, and finally enabling the dry coal powder to continuously enter an injection line pipe through a rotary feeder.
Further, nitrogen is used as a conveying medium for pulverized coal injection, and the conveying pressure is 0.1-0.3 MPa; the minimum conveying speed of the coal powder is 12m/s, the single-line conveying capacity of the coal powder is 25t/h, and the average gas consumption for single-line conveying is 20Nm 3/min.
Furthermore, the quicklime powder adopts 2 sets of independent tank-series systems, the materials are discharged through a lime powder bin, a tundish and a spraying tank, the materials are fed by a rotary feeder, two pulverized coal spraying pipelines are connected nearby, the lime tank-series spraying tank adopts a weighing mode for metering, and nitrogen pressurization, diffusion and fluidization valves and pipelines are arranged; the bottom of the blowing tank is directly connected with a rotary feeder, and the main components of the quicklime are more than or equal to 85 percent of CaO, less than or equal to 5 percent of MgO and less than or equal to 5 percent of SiO2Less than or equal to 3.5 percent, less than or equal to 0.05 percent of P, less than or equal to 0.15 percent of S and less than or equal to 3mm of granularity; in each quicklime powder injection system, lime powder enters the intermediate tank from a lime powder bin in a gravity automatic feeding mode, when the intermediate tank is full of lime powder, the blanking dome valve is closed, the quicklime powder is conveyed to the injection tank through nitrogen pressurization, the lime powder continuously enters the injection pipelines through the rotary feeder, and the two lime powder injection pipelines are respectively mixed with the two coal powder injection pipelines at the lower opening of the rotary feeder and are connected to the coal powder spray gun.
Further, the lime minimum conveying speed is 12 m/s. The single-line conveying capacity of the coal powder is 15t/h, and the average gas consumption for single-line conveying is 13Nm3/min。
Further, the hot ore bin contains iron ore powder and dolomite according to the ratio of 9:1, the iron ore powder is a pre-heating material at the early stage, the temperature of the iron ore powder is 450-650 ℃, and the pre-heated iron ore powder flows into the two intermediate tanks from the hot ore bin under the action of gravity. When the intermediate tank is full, the combined ball valves of the hot ore bin and the intermediate tank are closed. The feeding of the intermediate tank to the injection tank is started, the intermediate tank is pressurized with nitrogen, the combined ball valve of the intermediate tank and the injection tank is opened, and the hot ore powder is discharged from the intermediate tank to the injection tank by gravity. Pressure balance valves are arranged between the blowing tank and the hot ore spiral conveying feeder, and between the blowing tank and the conveying pipeline, and the pressure balance valves are utilized to balance the pressure between the two devices, so that the transfer of the mineral powder is realized. The bottom of each blowing tank is connected with a hot ore screw feeder, and the hot ore screw feeder continuously meters iron ore powder into a hot ore powder conveying line.
Further, the inner diameter of a conveying pipeline of the hot ore line is 200mm, the hot ore is conveyed by nitrogen in the conveying process, and the conveying pressure is 0.1-0.3 MPa. When the temperature of the hot ore is more than 400 ℃, the minimum conveying speed of the hot material is 19 m/s; when the temperature of the hot ore is less than 400 ℃, the minimum conveying speed of the hot material is 17m/s, and the average gas consumption for single-line conveying is 90Nm3And/min. The normal ore spraying amount of a single gun is 90t/h, the terminal conveying speed of the spray gun is 100m/s, and the nitrogen flow rate of the mixed spray gun is 5000-5500 Nm 3/h.
The utility model discloses an advantage and effect:
the utility model relates to a feed conveyor for smelting reduction furnace, the device have solved the feed transport problem of buggy, quicklime powder, iron ore powder simultaneously, and the single buggy jetting system of phase comparison stove has great improvement. The iron ore powder is high-temperature powder, has special requirements on devices such as a hot ore bin, a tundish, a blowing tank and a screw feeder, is provided with an air cannon, a cone fluidizer, an outer discharge port and the like, and solves the problems of normal blanking and smooth material and difficult material blockage of the material. And nitrogen is used as a conveying carrier and an injection carrier, so that automatic pipeline control of materials is realized. Feeding in a mode that cold material pulverized coal and quicklime powder are independently converged and then flow through a conveying pipeline, and blowing in a mode that hot material iron ore powder is independently flowed through the conveying pipeline and finally converged in front of a furnace so as to realize effective separation of cold materials and hot materials. Two mixing spray guns are adopted for blowing and are symmetrically distributed on two sides of the reduction furnace, so that the fountain effect in the molten pool can reach the optimal state, and the full heat exchange between the molten iron at the lower part in the molten pool and the high-temperature gas at the upper part is facilitated. The process has the advantages of flexible operation, simple process, less equipment investment, no pollution, cleanness, environmental protection and the like.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.
Drawings
FIG. 1 is a schematic view of a feed conveyor for a smelting reduction furnace according to the present invention.
1-hot ore storage; 2-a tundish; 3-blowing the tank; 4-a screw feeder; 5-quicklime powder bin; 6-a rotary feeder; 7-dry coal bunker; 8-transfer line
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly and completely described below. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
The technical solution of the present invention will be further explained and illustrated with reference to the following specific embodiments.
Example 1
The embodiment of the utility model provides a technical problem that will solve provides a feed conveyor for smelting reduction furnace, and this method includes three conveying system, buggy feed conveying system, quicklime powder feed conveying system and iron ore powder, dolomite powder feed conveying system. Pulverized coal adopts 4 sets of tank-stringing systems, and is fed through a dry coal bin, a middle tank and a blowing tank and a rotary feeder; the quicklime powder adopts 2 sets of serial tank systems, and is fed through a lime powder bin, a middle tank and a blowing tank, and a rotary feeder, and two pulverized coal blowing pipelines are connected nearby; iron ore powder and dolomite powder are fed by 2 sets of tank-series systems through a hot ore bin, a tundish and a blowing tank, and are fed by a screw feeder, wherein the materials in the hot ore bin are powder prepared by proportioning the iron ore powder and the dolomite powder and dried and heated. The hot ore, the coal powder and the flux pipeline are converged before entering the spray gun by using nitrogen as carrier gas, and the blowing pipelines of the three systems are finally converged into two pipelines in front of the furnace, so that the mixture of the hot ore powder, the quicklime powder and the coal powder is conveyed to the front of the furnace and is sprayed into the smelting reduction furnace through the two spray guns together.
A conveying process of a feed conveying device for a smelting reduction furnace, comprising the following process steps:
(1) pulverized coal feeding and conveying system
The pulverized coal feeding and conveying system comprises 1 dry coal bin and is composed of 4 sets of identical independent tank-stringing injection series, and the pulverized coal feeding and conveying system feeds materials through the dry coal bin, the intermediate tank and the injection tank and a rotary feeder. The pulverized coal tandem injection is measured by adopting a weighing mode, and nitrogen pressurization, diffusion and fluidization valves and pipelines are arranged on the pulverized coal tandem injection; the bottom of the blowing tank is directly connected with a pulverized coal rotary feeder, the metering precision of the rotary feeder is +/-1%, and the maximum capacity is 25 t/h.
The coal powder for blowing can be anthracite, or coal for blowing such as bituminous coal and power coal. The coal powder in the dry coal bunker is dry coal powder obtained by drying and crushing in the early stage, and the moisture content of the dry coal powder is less than or equal to 2 percent. The composition of the dry coal powder is shown in table 1.
TABLE 1 composition of coal for injection in smelting reduction furnace
| Raw materials | Ash (%) | Containing sulfurAmount (%) | Volatile matter (%) | Fixed carbon (%) | Coefficient of grindability of Ha' s | Particle size (mm) |
| Anthracite coal | 10～15 | ≤0.6 | 7～9 | 73～83 | ≥30 | ≤3 |
Firstly, dry coal powder with the volume of more than 80 percent is stored in a dry coal bin, and in a single injection system, the dry coal powder enters a tundish from the dry coal powder bin in a gravity automatic feeding mode. When the intermediate tank is full, the blanking ball valve is closed. And then, feeding the dry coal powder into the injection tank from the intermediate tank, and conveying the dry coal powder into the injection tank from the intermediate tank through operations of nitrogen pressurization, fluidization, pressure balance and the like. And finally, the dry coal powder continuously enters the injection line pipe through the rotary feeder.
(2) Quicklime powder feeding and conveying system
The quick lime powder adopts 2 sets of independent tank-series systems, and two pulverized coal injection pipelines are connected nearby through feeding of a lime powder bin, a tundish and an injection tank and feeding of a rotary feeder. The lime serial tank injection tank is metered by adopting a weighing mode and is provided with a nitrogen pressurizing, diffusing and fluidizing valve and a pipeline; the bottom of the blowing tank is directly connected with a rotary feeder, the metering precision of the rotary feeder is +/-1%, and the maximum capacity is 15 t/h. The quicklime powder composition is shown in table 2.
TABLE 2 quicklime powder ingredient Table
| Raw materials | CaO(％) | MgO(％) | SiO2(％) | P(％) | S(％) | Particle size (mm) |
| Quicklime powder | ≥85 | ≤5 | ≤3.5 | ≤0.05 | ≤0.15 | ≤3 |
In each quicklime powder injection system, lime powder enters the intermediate tank from a lime powder bin in a gravity automatic feeding mode. When the intermediate tank is full of lime powder, the blanking dome valve is closed, and the quicklime powder is sent to the blowing tank through nitrogen pressurization. The lime powder continuously enters the blowing pipeline through the rotary feeder. The two lime powder injection pipelines are respectively mixed with the two coal powder injection pipelines at the lower opening of the rotary feeder and connected to the coal powder spray gun.
(3) Hot ore feeding and conveying system
The hot ore feeding and conveying system comprises a hot ore bin, two intermediate tanks and two injection tanks, wherein the hot ore bin provides raw materials for two independent tank-series systems, and each tank-series system provides raw materials for one conveying pipeline. 4 cone fluidizers, 4 air guns and 2 outer discharge ports are arranged on the hot ore bin. Each intermediate tank and each blowing tank are provided with an air cannon, a cone fluidizer and an outer discharge port. And the air cannon can increase solid fluidization and help the hot ore powder material to be transferred. The cone fluidizer can relieve vacuum caused by gaps of fine particles, improve the flow characteristic of hot mineral powder according to requirements, enable the material to be in a fluidized state and be easy to feed. And the outer discharge port is used for manually discharging when the material is blocked.
The hot ore comprises iron ore powder and dolomite in a ratio of 9: 1. The iron ore powder is an iron-containing material used for the smelting reduction furnace and comprises iron-containing dust such as iron ore, iron scale, steelmaking fly ash and the like, wherein the iron ore powder is a preheating material at the early stage, and the temperature of the iron ore powder is 450-650 ℃. The specific components are shown in tables 3 and 4.
TABLE 3 typical ingredients of iron ore powder TABLE (wt/%)
TABLE 4 ingredients of dolomite powder (wt/%)
| Name (R) | MgO | SiO2 | Acid insoluble substance | Moisture content |
| Index (I) | ≥19％ | ≤4％ | ≤7％ | 3～5％ |
Under the action of gravity, the preheated iron ore powder flows into the two intermediate tanks from the hot ore bin. When the intermediate tank is full, the combined ball valves of the hot ore bin and the intermediate tank are closed. The feeding of the intermediate tank to the injection tank is started, the intermediate tank is pressurized with nitrogen, the combined ball valve of the intermediate tank and the injection tank is opened, and the hot ore powder is discharged from the intermediate tank to the injection tank by gravity. Pressure balance valves are arranged between the blowing tank and the hot ore spiral conveying feeder, and between the blowing tank and the conveying pipeline, and the pressure balance valves are utilized to balance the pressure between the two devices, so that the transfer of the mineral powder is realized. The bottom of each blowing tank is connected with a hot ore screw feeder, and the hot ore screw feeder continuously meters iron ore powder into a hot ore powder conveying line. The tank stringing system, the circulating pipeline and the screw feeder are pressurized and equalized by nitrogen.
(4) Material mixing and blowing system
The blowing pipelines of the three systems are finally converged into two pipelines in front of the furnace, so that the mixture of the hot mineral powder, the quicklime powder and the coal powder is conveyed to the front of the furnace and is sprayed into the smelting reduction furnace through the two spray guns together.
Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides a feed conveyor for smelting reduction furnace, its characterized in that, includes hot ore bin (1), intermediate tank (2), jetting jar (3), screw feeder (4), quick lime powder storehouse (5), rotary feeder (6), dry coal bunker (7), conveying line (8), the export in hot ore bin (1) loops through intermediate tank (2), jetting jar (3), screw feeder (4) is connected to conveying line (8), the export in quick lime powder storehouse (5) loops through intermediate tank (2), jetting jar (3), rotary feeder (6) is connected to conveying line (8), the export in dry coal bunker (7) loops through intermediate tank (2), jetting jar (3), rotary feeder (6) is connected to conveying line (8).
2. The feed conveying device as claimed in claim 1, characterized in that the hot ore bin (1) adopts 2 sets of tank-stringing systems, and 2 outlets of the hot ore bin tank-stringing systems are respectively connected with the intermediate tank, the blowing tank, the screw feeder (4) and the conveying pipeline (8) in turn.
3. A feeding and conveying device as claimed in claim 1 or 2, characterized in that the quicklime powder bin (5) adopts 2 sets of tank stringing systems, and 2 outlets of the quicklime powder tank stringing systems are respectively connected with the intermediate tank, the blowing tank, the rotary feeder (6) and the conveying pipeline (8) in turn through 2.
4. A feed conveyor according to claim 3, characterized in that the dry coal bunker (7) is a 4-set can-stringing system, and 4 outlets of the dry coal bunker can-stringing system are respectively connected with the intermediate tank, the blowing tank, the rotary feeder (6) and the conveying pipeline (8) in turn through 4 pipelines.
5. A feed conveyor according to claim 4, characterized in that the conveying lines of the hot ore bin (1), the quicklime powder bin (5) and the dry coal bin (7) are finally combined into 2 lines and injected into the smelting reduction furnace through two mixing lances.
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| CN201922067264.XU CN211003567U (en) | 2019-11-26 | 2019-11-26 | Feeding and conveying device for smelting reduction furnace |
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| CN201922067264.XU CN211003567U (en) | 2019-11-26 | 2019-11-26 | Feeding and conveying device for smelting reduction furnace |
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