CN212864820U - Anti-blocking coal powder blowing device of melting reduction furnace - Google Patents
Anti-blocking coal powder blowing device of melting reduction furnace Download PDFInfo
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- CN212864820U CN212864820U CN202021222747.9U CN202021222747U CN212864820U CN 212864820 U CN212864820 U CN 212864820U CN 202021222747 U CN202021222747 U CN 202021222747U CN 212864820 U CN212864820 U CN 212864820U
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Abstract
An anti-blocking pulverized coal blowing device of a smelting reduction furnace comprises a dry coal bin (1), a blanking bin (2), an intermediate tank (3), a blowing tank (4), a rotary feeder (15) and a dome valve (16); a blanking bin (2) is arranged at the lower part of the dry coal bin (1), the blanking bin is in an inverted cone shape, a three-layer fluidizing device (6) is arranged on the blanking bin (2), and the lower fluidizing device is positioned near the outlet of the blanking bin and is provided with 4 fluidizing holes; the middle fluidizing device is positioned at the lower position in the middle of the blanking bin and is provided with 8 fluidizing holes; the upper fluidizing device is positioned close to the upper position in the middle of the blanking bin and is provided with 4 fluidizing holes; the fluidizing device includes fluidizing gas nozzles for continuously feeding fluidizing nitrogen into the dry coal bunker. The device solves the problem of normal blanking of materials, so that the materials are smooth and are not easy to block.
Description
Technical Field
The utility model relates to a non-blast furnace melting ironmaking field relates to a buggy jetting device, especially a melting reduction furnace prevents stifled material buggy jetting device.
Background
The blast furnace injection coal powder is pulverized coal which is directly injected into the blast furnace from a blast furnace tuyere to replace part of coke, can provide heat and serve as a reducing agent, and a coal injection system is important equipment in the blast furnace ironmaking technology. The coal powder is anthracite or bituminous coal and is prepared by mixing various types of coal which are respectively arranged in a plurality of coal blending bins and are mixed according to a certain proportion. At present, a parallel injection technology is mostly adopted in a blast furnace coal injection system, and 2-4 injection tanks correspond to one blast furnace. The situation of unsmooth blanking often appears in the dry pulverized coal in the blanking process, and the stability and the smooth operation of a coal injection system are seriously restricted.
At present, the smelting reduction method adopts a mode of directly blowing coal powder, nitrogen is used as carrier gas to inject the coal powder into a smelting reduction furnace in a pneumatic conveying mode, and in order to ensure that the coal powder reaches a certain blowing and blowing depth, granular coal blowing is needed, which is different from blast furnace coal powder blowing, the finer the coal for the blast furnace is, the better the coal powder for the blast furnace is, the coal powder for the blast furnace can be immediately combusted, and the different of subsequent coal powder blowing devices is also determined. Due to the increase of the granularity of the pulverized coal, the blocking condition of a pulverized coal injection system is greatly increased, and the coal injection effect is further influenced. The pulverized coal injection of the melting reduction furnace adopts a serial tank injection and multistage fluidization anti-blocking device, the serial tank injection tank can be used for continuous injection, the injection amount is stable, and the occupied area of a factory building is small. Therefore, there is a need to develop an anti-clogging pulverized coal injection apparatus for a smelting reduction furnace.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a melting reduction furnace prevents stifled material buggy jetting device for there is the putty problem of buggy unloading jetting among the solution prior art. It is a coal powder injection device specially designed for a smelting reduction furnace.
In order to solve the technical problem, the utility model discloses a technical scheme as follows:
an anti-blocking pulverized coal blowing device of a smelting reduction furnace comprises a dry coal bin (1), a blanking bin (2), an intermediate tank (3), a blowing tank (4), a rotary feeder (15) and a dome valve (16), wherein an outlet of the blanking bin is connected to a conveying pipeline sequentially through an intermediate tank inlet dome valve (8), the intermediate tank (3), an intermediate tank outlet dome valve (12), a blowing tank inlet dome valve (13), the blowing tank (4), the rotary feeder (15) and a blowing tank outlet dome valve (16); a blanking bin (2) is arranged at the lower part of the dry coal bin (1), the blanking bin is in an inverted cone shape, three layers of fluidizing devices (6) are arranged on the blanking bin (2), the lower fluidizing device is positioned near an outlet of the blanking bin and is provided with 4 fluidizing holes, the fluidizing holes are horizontally and uniformly arranged on the same circular cross section, and an angle of 90 degrees is formed between the two fluidizing holes; the middle fluidizing device is positioned at the lower position in the middle of the blanking bin, is provided with 8 fluidizing holes, is horizontally and uniformly arranged on the same circular section, and forms an angle of 45 degrees between the two fluidizing holes; the upper fluidizing device is positioned at the upper position in the middle of the blanking bin and is provided with 4 fluidizing holes, the fluidizing holes are horizontally and uniformly arranged on the same circular section, and an angle of 90 degrees is formed between the two fluidizing holes; the fluidizing device includes fluidizing gas nozzles for continuously feeding fluidizing nitrogen into the dry coal bunker.
Further, the three-layer fluidization device (6) is controlled by the fluidization sequential control device, program automatic control is carried out according to a set opening and closing mode, when the inlet dome valve (8) of the middle tank is opened, fluidization sequential control of the three-layer fluidization device (6) on the blanking bin (2) is opened, the lowest fluidization valve is opened firstly, and the lowest fluidization valve is closed after 2 seconds; then opening the intermediate fluidizing valve, and closing the intermediate fluidizing valve after 2 seconds; finally, the uppermost fluidizing valve was opened, and after 2 seconds, the uppermost fluidizing valve was closed, and then the circulation was performed in this manner to continue the fluidization.
Furthermore, a discharge port is arranged at the lower part of the blanking bin (2) and is used for manually discharging materials during material blockage; the lower part of the blanking bin (2) is also provided with a gate valve which is always in an open state when materials are normally blanked, and when the blanking bin is blocked, the gate valve is closed, so that the blanking bin can be cleared; a middle tank inlet dome valve (8) is arranged below the discharge hole of the blanking bin (2) and used for controlling the opening and closing of the pulverized coal blanking.
Further, a material level meter is arranged at the top of the dry coal bunker (1) and used for monitoring the material level height.
Further, the pulverized coal injection system comprises 1 dry coal bunker (1) which is composed of 4 sets of identical independent serial tank injection series. The dry coal bunker (1) lower part is provided with 4 blanking storehouses (2), and the blanking storehouses are in the shape of an inverted cone.
Furthermore, a material level meter is arranged at the upper part of the intermediate tank and used for monitoring the material level height of the intermediate tank; the upper part of the intermediate tank is provided with a pressure transmitter port which is connected with a pressure transmitter and a pressure gauge and used for monitoring the pressure in the intermediate tank; an exhaust pipeline (9) is arranged at the upper part of the intermediate tank and communicated with the atmosphere, and an exhaust valve is arranged on the exhaust pipeline (9) and used for relieving the pressure inside the intermediate tank.
Furthermore, a single-layer fluidizing device is arranged at the lower part of the intermediate tank and is used for smoothly feeding the pulverized coal; a fluidization plate (11) is arranged in the middle tank, fluidization cloth (10) covers the fluidization plate, when the fluidization device is started, fluidization gas blows and swells the fluidization cloth, when the fluidization device is closed, the fluidization cloth is quickly retracted, and pulverized coal can be quickly blanked through contraction of the fluidization cloth; the intermediate tank adopts pulse fluidization, and the fluidization is only started in the blanking process.
Furthermore, a weighing sensor (14) is arranged on the injection tank and used for weighing the pulverized coal.
Furthermore, the injection tank is also provided with three layers of fluidizing devices, pulse type fluidizing is adopted, the fluidizing is started only in the blanking process, and the three layers of fluidizing devices are simultaneously started and closed.
Furthermore, the lower part of the injection tank is provided with a tank bottom blockage clearing opening, the blockage clearing opening extends out of the tank body by a distance of 300-500 mm, and the tank bottom blockage clearing opening is sealed by a flange and used for manually discharging during material blockage.
The utility model discloses an advantage and effect:
the utility model discloses to the easy stifled problem of buggy jetting device for melting reduction furnace carry out all-round improvement and optimization. The blanking bin is provided with a fluidizing device, a discharge hole and other devices, so that the normal blanking of materials is solved, the materials are smooth, and the materials are not easy to block. The three-layer fluidizing device on the blanking bin adopts a sequential control mode to carry out layer-by-layer fluidization, so that the pulverized coal can be smoothly discharged. The outer discharging port and the gate valve arranged on the blanking bin are also beneficial to cleaning during coal powder blockage. The material level height can be monitored in real time by arranging the material level meter at the top of the tundish, and the fluidization plate and the fluidization cloth covered on the fluidization plate are uniquely arranged in the tundish, so that the quick blanking of the pulverized coal can be realized through the action of one flutter of the fluidization cloth. The injection tank is also provided with three layers of fluidization devices, pulse fluidization is adopted, fluidization is only started in the blanking process, and the three layers of fluidization devices are simultaneously started and closed, so that the three layers of fluidization devices are different from fluidization of a dry coal bunker, and the smooth blanking of pulverized coal can be realized. The lower part of the injection tank is provided with a tank bottom blockage clearing opening for manual discharging during material blockage.
And nitrogen is used as a conveying carrier and an injection carrier, so that automatic pipeline control of materials is realized. The pulverized coal tandem injection tank adopts a weighing mode to measure, and is provided with a nitrogen pressurizing, diffusing and fluidizing valve and a pipeline.
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 structural view of the pulverized coal injection anti-blocking device for a smelting reduction furnace of the present invention.
1-dry coal bunker; 2-a blanking bin; 3-a tundish; 4-blowing tank; 5-a level indicator; 6-three layers of fluidizing devices; 7-a discharge port; 8-intermediate tank inlet dome valve; 9-an exhaust duct; 10-fluidizing cloth; 11-a fluidization plate; 12-a blowing tank inlet dome valve; 13-a blowing tank outlet dome valve; 14-a load cell; 15-a rotary feeder; 16-a blowing tank outlet dome valve; 17-a blowing tank fluidizing device; and 18-clearing and blocking the bottom of the tank.
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
An anti-blocking pulverized coal injection device of a smelting reduction furnace is disclosed, wherein the system mainly comprises a dry coal bin 1, a blanking bin 2, an intermediate tank 3, an injection tank 4, a rotary feeder 15 and a dome valve 16;
the pulverized coal injection system comprises 1 dry coal bunker 1 which is composed of 4 sets of completely identical independent serial tank injection series. The dry coal bunker 1 lower part is called 4 blanking bins 2, the blanking bins are in an inverted cone shape, three layers of fluidizing devices 6 are installed on the blanking bins, a gate valve is installed on the lower parts of the blanking bins, and outlets of the blanking bins are connected to a conveying pipeline through a middle tank inlet dome valve 8, a middle tank 3, a middle tank outlet dome valve 12, a blowing tank inlet dome valve 13, a blowing tank 4, a rotary feeder 15 and a blowing tank outlet dome valve 16 in sequence.
Firstly, dry coal powder with the volume of more than 80 percent is stored in a dry coal bin, in a single injection system, the dry coal powder enters an intermediate tank 3 from the dry coal powder bin 1 in a gravity automatic feeding mode, when the intermediate tank 3 is full, a dome valve 8 at the inlet of the intermediate tank is closed, the blanking is stopped, then the intermediate tank 3 feeds the dry coal powder to an injection tank 4, the dry coal powder is pressurized, fluidized and balanced by nitrogen, is conveyed to the injection tank 4 from the intermediate tank 3, and finally the dry coal powder continuously enters an injection line pipe through a rotary feeder 15.
Further, a material level meter is arranged at the top of the dry coal bunker 1 and used for monitoring the material level height;
furthermore, a three-layer fluidizing device 6 is arranged on the blanking bin 2, and the lower fluidizing device is positioned near the outlet of the blanking bin and is provided with 4 fluidizing holes; the middle fluidizing device is positioned at the lower position in the middle of the blanking bin and is provided with 8 fluidizing holes; the upper fluidizing device is positioned close to the upper position in the middle of the blanking bin and is provided with 4 fluidizing holes; the fluidizing device comprises a fluidizing gas nozzle for continuously feeding fluidized nitrogen into the dry coal bunker;
further, the three-layer fluidization device 6 has fluidization sequential control, when the inlet dome valve 8 of the middle tank is opened, the fluidization sequential control of the three-layer fluidization device 6 on the blanking bin 2 is started, the lowermost fluidization valve is opened firstly, and the lowermost fluidization valve is closed after 2 seconds; then opening the intermediate fluidizing valve, and closing the intermediate fluidizing valve after 2 seconds; finally, the uppermost fluidizing valve was opened and after 2 seconds the uppermost fluidizing valve was closed. Then circulating and continuously fluidizing according to the operation;
further, a discharge port is formed in the lower portion of the blanking bin 2 and used for manually discharging materials during material blocking; the lower part of the blanking bin 2 is also provided with a gate valve which is always in an open state when materials are normally blanked, and when the blanking bin is blocked, the gate valve is closed, so that the blanking bin can be cleared; a middle tank inlet dome valve 8 is arranged below a discharge port of the blanking bin 2 and used for controlling the opening and closing of pulverized coal blanking;
furthermore, a material level meter is arranged at the upper part of the intermediate tank and used for monitoring the material level height of the intermediate tank; the upper part of the intermediate tank is provided with a pressure transmitter port which is connected with a pressure transmitter and a pressure gauge and used for monitoring the pressure in the intermediate tank; an exhaust pipeline 9 is arranged at the upper part of the intermediate tank and communicated with the atmosphere, and an exhaust valve is arranged on the exhaust pipeline 9 and used for pressure relief inside the intermediate tank;
furthermore, a single-layer fluidizing device is arranged at the lower part of the intermediate tank and is used for smoothly feeding the pulverized coal; the middle tank is internally provided with a fluidization plate 11, fluidization cloth 10 covers the fluidization plate, when the fluidization device is started, fluidization gas blows and swells the fluidization cloth, when the fluidization device is closed, the fluidization cloth is quickly retracted, and pulverized coal can be quickly blanked through contraction of the fluidization cloth; the fluidization of the intermediate tank adopts pulse fluidization, and the fluidization is started only in the blanking process;
furthermore, a weighing sensor 14 is arranged on the injection tank and used for weighing the pulverized coal;
furthermore, the injection tank is also provided with three layers of fluidization devices, pulse fluidization is adopted, fluidization is started only in the blanking process, and the three layers of fluidization devices are simultaneously started and closed and are different from fluidization of a dry coal bunker, so that the pulverized coal can be smoothly blanked;
furthermore, the lower part of the injection tank is provided with a tank bottom blockage clearing opening, the blockage clearing opening extends out of the tank body by a distance of 300-500 mm, and the tank bottom blockage clearing opening is sealed by a flange and used for manually discharging during material blockage.
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 (10)
1. The anti-blocking pulverized coal blowing device for the smelting reduction furnace is characterized by comprising a dry coal bin (1), a blanking bin (2), an intermediate tank (3), a blowing tank (4), a rotary feeder (15) and a dome valve (16), wherein an outlet of the blanking bin is connected to a conveying pipeline through the intermediate tank inlet dome valve (8), the intermediate tank (3), the intermediate tank outlet dome valve (12), the blowing tank inlet dome valve (13), the blowing tank (4), the rotary feeder (15) and the blowing tank outlet dome valve (16) in sequence; a blanking bin (2) is arranged at the lower part of the dry coal bin (1), the blanking bin is in an inverted cone shape, a three-layer fluidizing device (6) is arranged on the blanking bin (2), and the lower fluidizing device is positioned near the outlet of the blanking bin and is provided with 4 fluidizing holes; the middle fluidizing device is positioned at the lower position in the middle of the blanking bin and is provided with 8 fluidizing holes; the upper fluidizing device is positioned close to the upper position in the middle of the blanking bin and is provided with 4 fluidizing holes; the fluidizing device includes fluidizing gas nozzles for continuously feeding fluidizing nitrogen into the dry coal bunker.
2. The pulverized coal injection apparatus as claimed in claim 1, wherein the three-layer fluidizing means (6) is controlled by a fluidizing compliance control means, and when the dome valve (8) at the inlet of the intermediate tank is opened, the fluidizing compliance control of the three-layer fluidizing means (6) on the blanking silo (2) is opened, the lowermost fluidizing valve is opened first, and the lowermost fluidizing valve is closed after 2 seconds; then opening the intermediate fluidizing valve, and closing the intermediate fluidizing valve after 2 seconds; finally, the uppermost fluidizing valve was opened, and after 2 seconds, the uppermost fluidizing valve was closed, and then the circulation was performed in this manner to continue the fluidization.
3. The pulverized coal injection apparatus as claimed in claim 1, wherein a discharge opening is provided at a lower portion of the blanking bin (2) for manual discharging in case of material blockage; the lower part of the blanking bin (2) is also provided with a gate valve which is always in an open state when materials are normally blanked, and when the blanking bin is blocked, the gate valve is closed, so that the blanking bin can be cleared; a middle tank inlet dome valve (8) is arranged below the discharge hole of the blanking bin (2) and used for controlling the opening and closing of the pulverized coal blanking.
4. The pulverized coal injection apparatus as claimed in claim 1, wherein a level gauge is provided at the top of the dry coal bunker (1) for monitoring a level height.
5. The blockage-preventing pulverized coal injection apparatus of a smelting reduction furnace according to claim 1, wherein the pulverized coal injection system comprises 1 dry coal bunker (1) composed of 4 sets of identical independent tandem injection series, and 4 blanking bunkers (2) are provided at the lower part of the dry coal bunker (1).
6. The pulverized coal injection apparatus as claimed in claim 1, wherein a level gauge is provided at an upper portion of the tundish for monitoring a level of the tundish; the upper part of the intermediate tank is provided with a pressure transmitter port which is connected with a pressure transmitter and a pressure gauge and used for monitoring the pressure in the intermediate tank; an exhaust pipeline (9) is arranged at the upper part of the intermediate tank and communicated with the atmosphere, and an exhaust valve is arranged on the exhaust pipeline (9) and used for relieving the pressure inside the intermediate tank.
7. The anti-clogging pulverized coal injection apparatus for a smelting reduction furnace according to claim 1, wherein a single-layer fluidizing device is provided at a lower portion of the tundish for smooth charging of the pulverized coal; a fluidization plate (11) is arranged in the middle tank, fluidization cloth (10) covers the fluidization plate, when the fluidization device is started, fluidization gas blows and swells the fluidization cloth, when the fluidization device is closed, the fluidization cloth is quickly retracted, and pulverized coal can be quickly blanked through contraction of the fluidization cloth; the intermediate tank adopts pulse fluidization, and the fluidization is only started in the blanking process.
8. The clogging-preventing pulverized coal injection apparatus for a smelting reduction furnace as set forth in claim 1, wherein the injection pot is provided with a weighing sensor (14) for weighing pulverized coal.
9. The clogging-preventing pulverized coal injection apparatus for a smelting reduction furnace as set forth in claim 1, wherein the injection pot is also provided with three fluidizing means for opening fluidizing only during blanking by pulse fluidizing, and the three fluidizing means are simultaneously opened and closed.
10. The pulverized coal injection apparatus as claimed in claim 1, wherein a bottom block-removing opening is provided at a lower portion of the injection tank, the block-removing opening extends out of the tank body by a distance of 300 to 500mm, and is sealed by a flange for manual discharge during blocking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021222747.9U CN212864820U (en) | 2020-06-28 | 2020-06-28 | Anti-blocking coal powder blowing device of melting reduction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021222747.9U CN212864820U (en) | 2020-06-28 | 2020-06-28 | Anti-blocking coal powder blowing device of melting reduction furnace |
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| Publication Number | Publication Date |
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| CN212864820U true CN212864820U (en) | 2021-04-02 |
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| CN202021222747.9U Active CN212864820U (en) | 2020-06-28 | 2020-06-28 | Anti-blocking coal powder blowing device of melting reduction furnace |
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| CN (1) | CN212864820U (en) |
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- 2020-06-28 CN CN202021222747.9U patent/CN212864820U/en active Active
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