A blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting

Abstract

The present invention provides a blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting, which is used in conjunction with a blast furnace. The device comprises a slag cooling mechanism, a preheating mechanism, a heat medium and an injection mechanism. The slag cooling mechanism is connected to the slag outlet of the blast furnace. The heat medium circulates between the slag cooling mechanism and the preheating mechanism. The injection mechanism connects the preheating mechanism and the blast furnace so that the pulverized coal preheated in the preheating mechanism is injected into the blast furnace through the injection mechanism. When the blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting of the present invention is used, the high-temperature slag discharged from the blast furnace is placed in the slag cooling mechanism. In the slag cooling mechanism, the slag and the heat medium conduct heat transfer, thereby heating the heat medium and cooling the slag. The heated slag is transported to the preheating mechanism for heat exchange with the pulverized coal, thereby preheating the pulverized coal. The preheated pulverized coal is injected into the blast furnace through the injection mechanism, thereby performing efficient combustion.

Description

Technical Field

[0001] The invention relates to the technical field of coal powder preheating, and in particular to a blast furnace coal powder injection preheating device for vanadium-titanium ore smelting. Background Art

[0002] With the continuous improvement of smelting technology, the requirements for coal combustion efficiency are getting higher and higher. Therefore, coal powder is generally preheated to improve combustion efficiency.

[0003] In the prior art, a heating mechanism is generally provided to heat the pulverized coal. Although this method improves the combustion efficiency, it also increases the energy consumption, resulting in low energy utilization. Summary of the invention

[0004] The object of the present invention is to provide a blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting, which can recover the heat of blast furnace slag for preheating pulverized coal, thereby reducing energy consumption.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] A blast furnace coal powder injection preheating device for vanadium-titanium ore smelting is used in conjunction with a blast furnace; it comprises a slag cooling mechanism, a preheating mechanism, a heat medium and an injection mechanism; the slag cooling mechanism is connected to the slag outlet of the blast furnace; the heat medium circulates between the slag cooling mechanism and the preheating mechanism; the injection mechanism connects the preheating mechanism and the blast furnace, so that the coal powder preheated in the preheating mechanism is injected into the blast furnace through the injection mechanism.

[0007] Furthermore, the slag cooling mechanism includes a rotatable and sequentially connected slag cooling cylinder and a mixing cylinder; the slag cooling cylinder is connected to the slag outlet of the blast furnace; the slag cooling cylinder is provided with a cooling circuit so that the slag inside the slag cooling cylinder can exchange heat with the coolant inside the cooling circuit; the heat medium is in granular form so that the heat medium can exchange heat with the slag in the mixing cylinder after mixing; the preheating mechanism also includes the mixing cylinder so that the heat medium and coal powder can be mixed inside its mixing cylinder.

[0008] Furthermore, the heat medium is an iron ball; the mixing barrel includes a discharging mechanism and a mixing chamber and a discharging port connected in sequence; one end of the mixing chamber is a feeding port and its inner wall is provided with a spiral guide strip along its circumference; the discharging port is provided with a cylindrical magnet; the discharging mechanism is connected to the preheating mechanism; the discharging mechanism includes a scraper; the scraper is provided at the top of the discharging port so that the iron ball is scraped off at the top of the discharging port.

[0009] Furthermore, the discharging mechanism also includes a guide groove; the guide groove is located directly below the scraper.

[0010] Furthermore, the preheating mechanism also includes a heat exchanger; the heat exchanger is connected to the feed port of the mixing barrel; the cooling circuit is connected to the heat exchanger so that when the air enters the mixing barrel through the heat exchanger, it exchanges heat with the coolant inside the heat exchanger.

[0011] Furthermore, it also includes a blowing mechanism; the blowing mechanism is connected to the mixing drum discharge port of the blast furnace and the preheating mechanism.

[0012] Furthermore, the blowing mechanism includes an air pump and a nozzle; the nozzle is connected to the blast furnace; the mixing barrel of the preheating mechanism is provided with an air collecting hood at its discharge port; the top of the air collecting hood is provided with an exhaust port, and the bottom is provided with a discharge port; the air pump is connected to the exhaust port and the middle part of the nozzle; the discharge port of the air collecting hood is connected to the end of the nozzle away from the blast furnace.

[0013] Furthermore, a storage tank is also provided at the front end of the nozzle; the storage tank is connected to the discharge port of the gas collecting hood.

[0014] Furthermore, the bottom of the guide groove is provided with sieve holes.

[0015] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0016] When the blast furnace coal powder injection preheating device for vanadium-titanium ore smelting of the present invention is used, the high-temperature slag discharged from the blast furnace is placed in a slag cooling mechanism. In the slag cooling mechanism, the slag and the heat medium are heat-transferred, thereby heating the heat medium and cooling the slag. The heated slag is transferred to the preheating mechanism for heat exchange with the coal powder, thereby preheating the coal powder. The preheated coal powder is sprayed into the blast furnace through the injection mechanism, thereby performing efficient combustion.

[0017] This preheating device heats the heat medium through heat transfer between blast furnace slag and the heat medium, and then the heat medium and the coal powder are transferred to preheat the coal powder, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the present invention cooperating with a blast furnace;

[0020] Figure 2 It is a schematic diagram of the cold pressing mechanism;

[0021] Figure 3 is a schematic diagram of a preheating mechanism;

[0022] Figure 4 is a schematic diagram of a scraper and a guide trough;

[0023] Figure 5 Schematic diagram of the nozzle.

[0024] Icons: 1-blast furnace, 2-slag cooling mechanism, 3-preheating mechanism, 4-blowing mechanism, 5-slag cooling cylinder, 6-mixing cylinder, 7-mixing chamber, 8-discharge port, 9-guide strip, 10-magnet, 11-scraper, 12-guide trough, 13-heat exchanger, 14-air pump, 15-nozzle, 16-gas collecting hood, 17-exhaust port, 18-iron ball, 19-storage tank, 20-nozzle. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Example:

[0027] like Figure 1-Figure 5 As shown, the present invention provides a blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting, which is used in conjunction with a blast furnace 1. It includes a slag cooling mechanism 2, a preheating mechanism 3, a heat medium and a blowing mechanism 4. The slag cooling mechanism 2 is connected to the slag outlet of the blast furnace 1. The slag cooling mechanism 2 can adopt a common slag cooling machine, or other types of slag cooling equipment. The slag cooling machine is generally a double-layer structure, and a coolant such as water or cooling oil is passed into the interlayer. After the slag enters the slag cooling machine, the heat of the slag is transferred to the coolant inside the interlayer, thereby heating the coolant. After the coolant is heated, it becomes a heat medium, which circulates between the slag cooling mechanism 2 and the preheating mechanism 3. In other words, the heated coolant is transported to the preheating device to heat the pulverized coal in the preheating device. The preheating mechanism 3 can also adopt the structure of a slag cooling machine, with the pulverized coal placed inside the preheating mechanism 3, and the heat medium is passed into the interlayer, thereby transferring the heat of the heat medium to the pulverized coal. The injection mechanism 4 connects the preheating mechanism 3 and the blast furnace 1 , so that the pulverized coal preheated in the preheating mechanism 3 is injected into the blast furnace 1 through the injection mechanism 4 .

[0028] When the blast furnace coal powder injection preheating device for vanadium-titanium ore smelting of the present invention is used, the high-temperature slag discharged from the blast furnace 1 is placed in the slag cooling mechanism 2. In the slag cooling mechanism 2, the slag and the heat medium are heat-transferred, thereby heating the heat medium and cooling the slag. The heated slag is transferred to the preheating mechanism 3 for heat exchange with the coal powder, thereby preheating the coal powder. The preheated coal powder is sprayed into the blast furnace 1 through the spraying mechanism 4, thereby performing efficient combustion.

[0029] This preheating device heats the heat medium through heat transfer between blast furnace 1 slag and the heat medium, and then the heat medium and the coal powder are transferred to preheat the coal powder, thereby reducing energy consumption.

[0030] In this embodiment, the slag cooling mechanism 2 includes a slag cooling tube 5 and a mixing tube 6 which are rotatable and sequentially connected. The slag cooling tube 5 is connected to the slag outlet of the blast furnace 1. The slag cooling tube 5 can adopt a common slag cooler. The slag cooling tube 5 is provided with a cooling circuit so that the slag inside the slag cooling tube 5 can exchange heat with the coolant inside the cooling circuit. In this patent, in order to distinguish the coolant in the cooling circuit and the heat transfer material in the slag cooling tube 5 that exchanges heat with the slag, the coolant in the cooling circuit is defined as the coolant, and the heat transfer material in the slag cooling tube 5 that exchanges heat with the slag is defined as the heat medium.

[0031] The heat medium is in a granular form so that heat exchange can be performed after the heat medium is mixed with the slag in the mixing barrel 6. The heat medium can be ceramic balls or other high temperature resistant particles with a particle size larger than that of coal powder. It is placed in the mixing barrel 6 of the cold pressing mechanism and the heat medium and the slag can be evenly mixed under the rotation of the mixing barrel 6, so that the heat medium is heated by the slag.

[0032] The preheating mechanism 3 also includes a mixing drum 6, so that the heated granular heat medium and the coal powder are mixed inside the mixing drum 6. Then, the heat of the heat medium is transferred to the coal powder, thereby preheating the coal powder.

[0033] When in use, the slag can be initially cooled by the slag cooling cylinder 5, so that the temperature of the slag is reduced. Then, the slag enters the mixing cylinder 6 to heat the granular heat medium. The heated heat medium is separated from the slag and then heats the pulverized coal. Due to the initial cooling of the slag, the maximum temperature of the slag heating the heat medium is limited, thereby preventing the granular heat medium from being too high and igniting the pulverized coal.

[0034] In this embodiment, the heat medium is an iron ball 18. The mixing drum 6 includes a discharging mechanism and a mixing chamber 7 and a discharge port 8 connected in sequence. One end of the mixing chamber 7 is a feed port and a spiral guide strip 9 is provided on its inner wall along its circumference. The guide strip 9 makes the interior of the mixing drum 6 spiral, which has a spiral conveying effect. When the mixing drum 6 rotates, the material inside it moves toward the discharge port 8 under the guiding action of the guide strip 9. The discharge port 8 is provided with a cylindrical magnet 10. After the magnet 10 is installed at the discharge port 8, the inner wall of the magnet 10 is the inner wall of the discharge port 8.

[0035] When the slag and the iron balls 18 are transported to the discharge port 8, the iron balls 18 are attracted by the magnets 10 and follow the magnets 10 to move to the top of the discharge port 8. The slag can only roll at the bottom of the discharge port 8. This effectively separates the heat medium from the slag. Similarly, when the mixing drum 6 is used in the preheating mechanism 3, the heat medium and the coal powder can also be effectively separated.

[0036] The discharge mechanism of the slag cooling mechanism 2 is connected to the preheating mechanism 3. In practice, a conveyor belt or other mechanism may be used to connect the discharge mechanism and the preheating mechanism 3. The discharge mechanism includes a scraper 11. Figure 4 As shown, the scraper 11 is arranged at the top of the discharge port 8 and is bent to be parallel to the tangent line of the top of the discharge port 8, so that the iron balls 18 are scraped off at the top of the discharge port 8. The discharge mechanism also includes a guide groove 12. The guide groove 12 is located directly below the scraper 11. The scraped iron balls 18 fall into the guide groove 12, move along the guide groove 12 to the conveyor belt, and are then transported to the preheating mechanism 3.

[0037] Similarly, the discharging mechanism of the preheating mechanism 3 is connected to the preheating mechanism 3 through a conveyor belt, so that the heat medium flows between the cooling slag mechanism 2 and the preheating mechanism 3.

[0038] The heat medium is set to iron balls 18, and the annular magnet 10 and the discharging mechanism can be conveniently separated from the heat medium, slag and coal powder. In addition, the blast furnace 1 slag is initially cooled by the slag cooler to avoid the iron balls 18 from melting at high temperatures.

[0039] In this embodiment, the preheating mechanism 3 further includes a heat exchanger 13. The heat exchanger 13 may be a common plate heat exchanger 13, which is also equipped with a fan. The fan drives the airflow to flow through the heat exchanger 13, so that the air exchanges heat with the high-temperature coolant inside the heat exchanger 13 when passing through the heat exchanger 13. The structure and principle of the plate heat exchanger 13 belong to the prior art and will not be described in detail in this specification.

[0040] like Figure 3As shown, the heat exchanger 13 is connected to the feed port of the mixing drum 6. The cooling circuit is connected to the heat exchanger 13 so that the air can exchange heat with the coolant inside the heat exchanger 13 when entering the mixing drum 6 through the heat exchanger 13. In other words, the air is first heated by the heat exchanger 13 and then sent to the mixing drum 6 of the preheating mechanism 3. The heat medium inside the mixing drum 6 can heat the coal powder and the air at the same time.

[0041] Due to the nature of the coolant itself, the temperature it can be heated to can only reach over 200 degrees. The ignition point of coal powder is about 500 degrees. In order to heat the coal powder to a higher temperature, a granular heat medium is used for heating. The air is heated by the coolant and then by the heat medium, so that its temperature can reach a higher level.

[0042] In this embodiment, a blowing mechanism 4 is also included. The blowing mechanism 4 is connected to the discharge port of the mixing drum 6 of the blast furnace 1 and the preheating mechanism 3. Figure 5 As shown, the injection mechanism 4 includes an air pump 14 and a nozzle 15. The nozzle 15 is connected to the inside of the blast furnace 1. The mixing barrel 6 of the preheating mechanism 3 is provided with an air collecting hood 16 at its discharge port. The top of the air collecting hood 16 is provided with an air suction port 17, and the bottom is provided with a discharge port. The air pump 14 is connected to the middle of the air suction port 17 and the nozzle 15. Specifically, a nozzle 20 is also provided inside the nozzle 15. The nozzle 20 points to the outlet of the nozzle 15 and the other end is connected to the air pump 14. The discharge port of the air collecting hood 16 is connected to the end of the nozzle 15 away from the blast furnace 1.

[0043] After being heated, the air and coal powder enter the air collecting hood 16. Under the action of the air pump 14, the high-temperature air is drawn through the top of the air collecting hood 16 and conveyed to the nozzle 20 under pressure, and then ejected from the nozzle 20. At the same time, the preheated coal powder falls to the nozzle 15 through the discharge port of the air collecting hood 16 and flows along the nozzle 15. The coal powder is ejected through the nozzle 15 under the blowing of the nozzle 20. Since the front end of the nozzle 15 is inserted into the interior of the blast furnace 1, the preheated air and coal powder are ejected into the interior of the blast furnace 1. In order to better ensure the ejection effect, the nozzle 15 can also be provided with a one-way valve, so that the air pressurized by the air pump 14 can only flow into the interior of the blast furnace 1.

[0044] In this embodiment, a storage tank 19 is also provided at the front end of the nozzle 15. The storage tank 19 is connected to the discharge port of the gas collecting hood 16. The preheated coal powder is temporarily stored in the storage pipe. The temporarily stored coal powder also avoids the gas backflow in the nozzle 15.

[0045] In this embodiment, sieve holes are provided at the bottom of the guide groove 12. When the iron ball 18 falls into the guide groove 12, the collision causes the slag or coal powder attached to the surface to fall off and pass through the sieve holes, thereby achieving better separation.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A blast furnace coal powder injection preheating device for vanadium-titanium ore smelting, used in conjunction with a blast furnace (1); characterized in that: The blast furnace (1) comprises a slag cooling mechanism (2), a preheating mechanism (3), a heat medium and a blowing mechanism (4); the slag cooling mechanism (2) is connected to the slag outlet of the blast furnace (1); the heat medium circulates between the slag cooling mechanism (2) and the preheating mechanism (3); the blowing mechanism (4) is connected to the preheating mechanism (3) and the blast furnace (1), so that the pulverized coal preheated in the preheating mechanism (3) is blown into the interior of the blast furnace (1) through the blowing mechanism (4); The slag cooling mechanism (2) comprises a slag cooling cylinder (5) and a mixing cylinder (6) which are rotatable and connected in sequence; the slag cooling cylinder (5) is connected to the slag outlet of the blast furnace (1); the slag cooling cylinder (5) is provided with a cooling circuit so that the slag inside the slag cooling cylinder (5) can exchange heat with the coolant inside the cooling circuit; the heat medium is in granular form so that the heat medium can exchange heat with the slag in the mixing cylinder (6) after mixing; the preheating mechanism (3) also comprises the mixing cylinder (6) so that the heat medium and coal powder can be mixed inside its mixing cylinder (6).

2. The blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting according to claim 1 is characterized in that: The heat medium is an iron ball (18); the mixing barrel (6) comprises a discharge mechanism and a mixing chamber (7) and a discharge port (8) connected in sequence; one end of the mixing chamber (7) is a feed port and a spiral guide strip (9) is arranged on its inner wall along its circumference; the discharge port (8) is provided with a cylindrical magnet (10); the discharge mechanism of the cooling slag mechanism (2) is connected to the preheating mechanism (3); the discharge mechanism comprises a scraper (11); the scraper (11) is arranged at the top of the discharge port (8) so that the iron ball (18) is scraped off at the top of the discharge port (8).

3. The blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting according to claim 2 is characterized in that: The discharging mechanism further comprises a guide groove (12); the guide groove (12) is located directly below the scraper (11).

4. The blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting according to claim 3 is characterized in that: The preheating mechanism (3) further comprises a heat exchanger (13); the heat exchanger (13) is connected to the feed port of the mixing barrel (6); the cooling circuit is connected to the heat exchanger (13) so that when the air enters the mixing barrel (6) through the heat exchanger (13), it exchanges heat with the cooling liquid inside the heat exchanger (13).

5. The blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting according to claim 4 is characterized in that: The blowing mechanism (4) is connected to the discharge port of the mixing barrel (6) of the blast furnace (1) and the preheating mechanism (3).

6. The blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting according to claim 5 is characterized by: The blowing mechanism (4) comprises an air pump (14) and a nozzle (15); the nozzle (15) is connected to the blast furnace (1); the mixing barrel (6) of the preheating mechanism (3) is provided with an air collecting hood (16) at its discharge port; the top of the air collecting hood (16) is provided with an air suction port (17), and the bottom is provided with an discharge port; the air pump (14) is connected to the air suction port (17) and the middle part of the nozzle (15); the discharge port of the air collecting hood (16) is connected to an end of the nozzle (15) away from the blast furnace (1).

7. The blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting according to claim 6 is characterized by: A material storage tank (19) is also provided at the front end of the nozzle (15); the material storage tank (19) is connected to the discharge port of the gas collecting hood (16).

8. The blast furnace pulverized coal injection preheating device for vanadium-titanium ore smelting according to claim 7 is characterized in that: The bottom of the guide groove (12) is provided with sieve holes.

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