A vertical kiln for producing high-purity magnesia

Abstract

The utility model belongs to high -purity magnesia production technical field especially relates to a vertical kiln for high -purity magnesia production, including vertical kiln and water tank, be equipped with heat exchange pipe in water tank, heat exchange pipe both ends all run through water tank side wall, the vertical kiln is connected with tail gas pipe, tail gas pipe with heat exchange pipe one end intercommunication, be equipped with agitator in water tank, water tank top is equipped with pressure relief device. The utility model discloses a vertical kiln in the production high -purity magnesia process produces the high -temperature tail gas of vertical kiln through tail gas pipe and enters the heat exchange pipe, through heat exchange pipe can heat the water in water tank, realized the waste heat utilization of high -temperature tail gas, through the rotation of second driven shaft can drive the stirring rod and stir water, make water heated more evenly, through spiral blade rotation can push water and move around the baffle circulation, further make water heated evenly, water vapor can lift dustproof cover and discharge through pressure relief hole, prevent the explosion of water tank pressure too high.

Description

Technical Field

[0001] This utility model belongs to the field of high-purity magnesia production technology, and in particular relates to a vertical kiln for high-purity magnesia production. Background Technology

[0002] Magnesia, also known as sintered magnesia, is produced by calcining magnesium hydroxide, which is obtained by reacting magnesite, hydrous magnesia, or seawater with lime slurry, at high temperatures. It has a strong hydration ability and is mainly used to make alkaline refractory materials, such as magnesia bricks and magnesia-alumina bricks. Magnesia with more impurities is used to pave the bottom of steelmaking furnaces. Magnesia can be divided into two main categories: natural magnesia and seawater magnesia, or synthetic magnesia. The production of magnesia requires calcination in a high-temperature vertical kiln.

[0003] The existing vertical kilns used for producing high-purity magnesia are not equipped with heat recovery devices in the exhaust gas emission stage, which causes the high-temperature exhaust gas emitted from the kiln to be directly released, and the problem of recovering the waste heat of the granular raw materials themselves is not solved, resulting in heat energy waste. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a vertical kiln for the production of high-purity magnesia, which solves the technical problem that the existing vertical kilns for the production of high-purity magnesia are not equipped with heat recovery devices in the tail gas emission stage, resulting in the direct escape of high-temperature tail gas emitted from the kiln body and the waste of heat energy.

[0005] To achieve the above objectives, the main technical solutions adopted by this utility model include: A vertical kiln for producing high-purity magnesia includes a vertical kiln and a water tank. A heat exchange pipe is fixedly installed inside the water tank, with both ends of the heat exchange pipe penetrating the side wall of the water tank. The vertical kiln is connected to a tail gas pipe, which is connected to one end of the heat exchange pipe. A stirring device is installed inside the water tank, and a pressure relief device is installed at the top of the water tank.

[0006] Furthermore, the stirring device includes a first driven shaft and a second driven shaft, both of which are rotatably connected to the upper wall of the water tank. The first driven shaft is fixedly provided with a spiral blade, and the second driven shaft is fixedly provided with a plurality of stirring rods.

[0007] Furthermore, two support plates are fixedly provided on the top surface of the water tank, and a drive shaft is rotatably provided between the two support plates. A first drive bevel gear and a second drive bevel gear are fixedly provided on the drive shaft. A first driven bevel gear is fixedly provided on the upper end of the first driven shaft, and a second driven bevel gear is fixedly provided on the upper end of the second driven shaft. A servo motor is fixedly provided on the side wall of one of the support plates, and the output end of the servo motor is fixedly connected to the drive shaft.

[0008] Furthermore, a partition is fixedly provided between the front wall and the rear wall of the water tank, the partition separating the first driven shaft and the second driven shaft, the upper end of the partition and the top surface inside the water tank forming an opening, and the lower end of the partition and the bottom surface inside the water tank forming an opening.

[0009] Furthermore, the heat exchange tube is serpentine and passes through the opening between the partition and the water tank.

[0010] Furthermore, the pressure relief device includes a movable rod that is slidably connected to the upper wall of the water tank. The upper wall of the water tank and the movable rod are provided with a plurality of pressure relief holes. A dust cover is fixedly provided at the upper end of the movable rod.

[0011] Furthermore, a limiting disc is fixedly provided at the lower end of the movable rod.

[0012] Furthermore, the water tank has a water level window on the front, an inlet pipe is connected to the upper part of the water tank and an inlet valve is installed on the inlet pipe, and an outlet pipe is connected to the lower part of the water tank and an outlet valve is installed on the outlet pipe.

[0013] Furthermore, the bottom surface of the water tank is fixedly provided with multiple fixing legs.

[0014] The beneficial effects of this utility model are: 1. The high-temperature exhaust gas generated during the production of high-purity magnesia in the vertical kiln enters the heat exchange tube through the exhaust pipe. The heat exchange tube can heat the water in the water tank, thus realizing the utilization of the waste heat of the high-temperature exhaust gas. 2. The rotation of the second driven shaft can drive the stirring rod to stir the water, making the water heat more evenly and improving the heat exchange effect of the high-temperature exhaust gas. 3. The rotation of the spiral blades can drive the water to circulate around the baffle, which further makes the water heat up more evenly and further improves the heat exchange effect of the high-temperature exhaust gas. 4. Water vapor can lift the dust cover and discharge it through the pressure relief hole, preventing excessive pressure inside the water tank from causing an explosion; 5. After heating is complete, the dust cover will fall under the influence of gravity and cover the pressure relief hole, preventing dust from entering the water tank through the pressure relief hole. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a three-dimensional schematic diagram of the internal structure of the water tank in this utility model; Figure 3 for Figure 2 Enlarged diagram of A in the middle; Figure 4 This is a three-dimensional schematic diagram of the heat exchange tube in this utility model.

[0016] In the diagram: 1. Vertical kiln; 2. Exhaust pipe; 3. Servo motor; 4. Support plate; 5. First driving bevel gear; 6. First driven bevel gear; 7. Second driving bevel gear; 8. Second driven bevel gear; 9. Water inlet pipe; 10. Water inlet valve; 11. Water tank; 12. Water outlet pipe; 13. Water outlet valve; 14. Water level window; 15. Fixed leg; 16. Drive shaft; 17. Second driven shaft; 18. Heat exchange pipe; 19. Stirring rod; 20. First driven shaft; 21. Spiral blade; 22. Baffle plate; 23. Dust cover; 24. Movable rod; 25. Limiting plate; 26. Pressure relief hole. Detailed Implementation

[0017] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1-4 As shown, this utility model provides a vertical kiln for producing high-purity magnesia, including a vertical kiln 1 and a water tank 11. A heat exchange pipe 18 is fixedly installed inside the water tank 11, with both ends of the heat exchange pipe 18 penetrating the side wall of the water tank 11. The vertical kiln 1 is connected to a tail gas pipe 2, which is connected to one end of the heat exchange pipe 18. A stirring device is installed inside the water tank 11, and a pressure relief device is installed at the top of the water tank 11. The stirring device includes a first driven shaft 20 and a second driven shaft 17, both of which are connected to the water tank 1. The upper wall is rotatably connected, with a spiral blade 21 fixed on the first driven shaft 20 and several stirring rods 19 fixed on the second driven shaft 17; two support plates 4 are fixed on the top surface of the water tank 11, and a drive shaft 16 is rotatably connected between the two support plates 4. A first drive bevel gear 5 and a second drive bevel gear 7 are fixed on the drive shaft 16. A first driven bevel gear 6 is fixed on the upper end of the first driven shaft 20, and a second driven bevel gear 8 is fixed on the upper end of the second driven shaft 17. One of the support plates 4 A servo motor 3 is fixedly mounted on the side wall, and the output end of the servo motor 3 is fixedly connected to the drive shaft 16; a partition 22 is fixedly mounted between the front wall and the rear wall of the water tank 11, the partition 22 separating the first driven shaft 20 and the second driven shaft 17, the upper end of the partition 22 and the inner top surface of the water tank 11 are connected by an opening, and the lower end of the partition 22 and the inner bottom surface of the water tank 11 are connected by an opening; the heat exchange pipe 18 is serpentine, and the heat exchange pipe 18 passes through the opening between the partition 22 and the water tank 11; the pressure relief device includes a movable rod 24, the movable rod 24... 4 is slidably connected to the upper wall of the water tank 11. Multiple pressure relief holes 26 are opened on the upper wall of the water tank 11 and around the movable rod 24. A dust cover 23 is fixedly installed on the upper end of the movable rod 24. A limiting plate 25 is fixedly installed on the lower end of the movable rod 24. A water level window 14 is provided on the front of the water tank. A water inlet pipe 9 is connected to the upper part of the water tank 11. A water inlet valve 10 is installed on the water inlet pipe 9. A water outlet pipe 12 is connected to the lower part of the water tank 11. A water outlet valve 13 is installed on the water outlet pipe 12. Multiple fixed legs 15 are fixedly provided on the bottom surface of the water tank 11.

[0019] During use, the high-temperature exhaust gas generated by the vertical kiln 1 during the production of high-purity magnesia enters the heat exchange tube 18 through the exhaust pipe 2. The heat exchange tube 18 can heat the water in the water tank 11, thus realizing the utilization of the waste heat of the high-temperature exhaust gas.

[0020] Starting the servo motor 3 drives the drive shaft 16 to rotate. The rotation of the drive shaft 16 drives the first drive bevel gear 5 and the second drive bevel gear 7 to rotate. The rotation of the second drive bevel gear 7 drives the second driven bevel gear 8 to rotate. The rotation of the second driven bevel gear 8 drives the second driven shaft 17 to rotate. The rotation of the second driven shaft 17 drives the stirring rod 19 to stir the water, making the water heat more evenly and improving the heat exchange effect of the high-temperature exhaust gas.

[0021] The rotation of the first active bevel gear 5 drives the rotation of the first driven bevel gear 6, which in turn drives the rotation of the first driven shaft 20. The rotation of the first driven shaft 20 drives the rotation of the spiral blade 21, which in turn propels the water to circulate around the partition 22, further ensuring uniform heating of the water and improving the heat exchange effect of the high-temperature exhaust gas.

[0022] During the heating process of water tank 11, water vapor can lift the dust cover 23 and discharge it through the pressure relief hole 26 to prevent the water tank 11 from becoming too high and exploding.

[0023] After heating is complete, the dust cover 23 falls under the influence of gravity and covers the pressure relief hole 26, preventing dust from entering the water tank 11 through the pressure relief hole 26.

[0024] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any modifications, alterations, substitutions, and variations made by those skilled in the art to the above embodiments are within the scope of the present invention.

Claims

1. A vertical kiln for producing high-purity magnesia, characterized in that, It includes a vertical kiln (1) and a water tank (11). A heat exchange pipe (18) is fixedly installed inside the water tank (11). Both ends of the heat exchange pipe (18) penetrate the side wall of the water tank (11). The vertical kiln (1) is connected to a tail gas pipe (2). The tail gas pipe (2) is connected to one end of the heat exchange pipe (18). A stirring device is installed inside the water tank (11). A pressure relief device is installed on the top of the water tank (11).

2. The vertical kiln for producing high-purity magnesia according to claim 1, characterized in that, The stirring device includes a first driven shaft (20) and a second driven shaft (17). Both the first driven shaft (20) and the second driven shaft (17) are rotatably connected to the upper wall of the water tank (11). The first driven shaft (20) is fixedly provided with a spiral blade (21), and the second driven shaft (17) is fixedly provided with a plurality of stirring rods (19).

3. The vertical kiln for producing high-purity magnesia according to claim 2, characterized in that, Two support plates (4) are fixedly provided on the top surface of the water tank (11). A drive shaft (16) is rotatably provided between the two support plates (4). A first drive bevel gear (5) and a second drive bevel gear (7) are fixedly provided on the drive shaft (16). A first driven bevel gear (6) is fixedly provided on the upper end of the first driven shaft (20). A second driven bevel gear (8) is fixedly provided on the upper end of the second driven shaft (17). A servo motor (3) is fixedly provided on the side wall of one of the support plates (4). The output end of the servo motor (3) is fixedly connected to the drive shaft (16).

4. A vertical kiln for producing high-purity magnesia according to claim 2, characterized in that, A partition (22) is fixedly provided between the front wall and the rear wall of the water tank (11). The partition (22) separates the first driven shaft (20) and the second driven shaft (17). The upper end of the partition (22) and the top surface of the water tank (11) are connected by an opening, and the lower end of the partition (22) and the bottom surface of the water tank (11) are connected by an opening.

5. A vertical kiln for producing high-purity magnesia according to claim 4, characterized in that, The heat exchange tube (18) is serpentine and passes through the opening between the partition (22) and the water tank (11).

6. A vertical kiln for producing high-purity magnesia according to claim 1, characterized in that, The pressure relief device includes a movable rod (24), which is slidably connected to the upper wall of the water tank (11). Multiple pressure relief holes (26) are provided on the upper wall of the water tank (11) and around the movable rod (24). A dust cover (23) is fixedly provided on the upper end of the movable rod (24).

7. A vertical kiln for producing high-purity magnesia according to claim 6, characterized in that, The lower end of the movable rod (24) is fixedly provided with a limiting plate (25).

8. A vertical kiln for producing high-purity magnesia according to claim 1, characterized in that, The water tank is provided with a water level window (14) on the front. The upper part of the water tank (11) is connected to a water inlet pipe (9), and a water inlet valve (10) is installed on the water inlet pipe (9). The lower part of the water tank (11) is connected to a water outlet pipe (12), and a water outlet valve (13) is installed on the water outlet pipe (12).

9. A vertical kiln for producing high-purity magnesia according to claim 1, characterized in that, The bottom surface of the water tank (11) is fixed with multiple fixed legs (15).

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