Iron ore reducibility testing device

Abstract

The utility model discloses an iron ore reducibility testing device, which relates to the technical field of testing devices and comprises a furnace body, the left side and the right side of the top of the furnace body are movably connected with cover plates through hinges, the upper end of an inner cavity of the furnace body is fixedly connected with a spiral pipe, and the back surface of the furnace body is fixedly connected with an electric telescopic rod. The telescopic end of the electric telescopic rod is fixedly connected with a weighing device, and the front end of the bottom of the weighing device is fixedly connected with a connecting block through a connecting rod. Iron ore in the box body is heated by heat dissipated by the thermocouple, reducing gas entering from the gas inlet pipe finally flows to the lower portion of the partition plate from the gas conveying pipe, enters from the vent holes in the lower portion of the box body, flows out from the vent holes in the side face of the box body after being reduced, and finally enters the gas collecting hood from the first gas outlet pipe. And after reducing gas passes through the box body, heat is brought to the spiral pipe to preheat the spiral pipe, the preheating effect can be achieved, and the reduction process of the iron ore is more sufficient.

Description

TECHNICAL FIELD

[0001] The utility model relates to test device technical field, concretely is a kind of iron ore reducibility test device. BACKGROUND

[0002] The reducibility of iron ore is a measure of the ease of removing oxygen combined with iron from iron ore by reducing gas;The reduction degree is the deoxidation degree reached after a certain time based on the trivalent iron state;The reduction rate is the change value of the reduction degree per unit time in the reduction process of iron ore based on the trivalent iron state. The determination of the reducibility of iron ore is often reflected by the reduction degree, reduction rate and other indicators to reflect the reducibility of iron ore. For example, Chinese patent CN101545842B is provided with a gas collecting hood at the outlet of the reducing gas, and a lighter is arranged in the gas collecting hood. A fan is arranged on the exhaust pipe. The lighter is ignited at regular intervals. At the same time, under the working of the fan on the exhaust pipe, the CO component in the reduced gas is treated by combustion to eliminate safety hazards. However, the regular ignition of the lighter may not completely cover the gas flow fluctuation, resulting in insufficient CO combustion. The gas collecting hood is designed statically, and the gas mixing effect is limited. At the same time, the iron ore particles are not fully contacted with the reducing gas, which further reduces the test effect. Therefore, we propose an iron ore reducibility test device. SUMMARY

[0003] The utility model aims at providing an iron ore reducibility test device to solve the problems raised in the background art.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an iron ore reducibility test device, comprising a furnace body, the left and right sides of the top of the furnace body are both movably connected with a cover plate through a hinge, and the upper end of the inner cavity of the furnace body is fixedly connected with a spiral pipe, the back of the furnace body is fixedly connected with an electric telescopic rod, the telescopic end of the electric telescopic rod is fixedly connected with a weighing machine, the front end of the bottom of the weighing machine is fixedly connected with a connecting block through a connecting rod, the bottom of the connecting block is fixedly connected with a plurality of equal-angle distributed thermocouples, the bottom of the connecting block is threadedly connected with a box body, a plurality of equidistantly distributed air holes are formed in the side wall and the bottom of the box body, the lower end of the inner cavity of the furnace body is fixedly connected with a partition plate, a reserved hole matched with the box body is formed in the inner side of the partition plate, a gas delivery pipe is fixedly connected to the inner surface of the partition plate, and the top of the gas delivery pipe is communicated with the bottom of the spiral pipe through a pipeline.

[0005] Preferably, the telescopic end of the electric telescopic rod is fixedly connected with an auxiliary rod, and the fixed end of the electric telescopic rod is fixedly connected with a frame, and the auxiliary rod is slidably connected to the inner side of the frame.

[0006] Preferably, the inner side of the cover plate is provided with a reserved groove that is compatible with the connecting rod, and the inner surface of the cover plate located on the right side is connected to the first air outlet pipe.

[0007] Preferably, the end of the first vent pipe is connected to a gas collection hood via a pipe, and the right end of the top of the gas collection hood is connected to a second vent pipe.

[0008] Preferably, a spiral plate is fixedly connected inside the gas collecting hood, and an igniter is fixedly connected to the side wall of the inner cavity of the gas collecting hood.

[0009] Preferably, the number of igniters is three, and the three igniters are evenly distributed in the middle position of the inner wall of the gas collecting hood.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] The heat emitted by the thermocouple in this invention heats the iron ore inside the box. The reducing gas that enters from the inlet pipe eventually flows through the gas delivery pipe to the bottom of the partition, enters through the vent at the bottom of the box, and after reduction, flows out through the vent on the side of the box and finally enters the gas collection hood through the first outlet pipe. The reducing gas carries the heat to the spiral tube after passing through the box, which can achieve the preheating effect and make the reduction process of the iron ore more complete.

[0012] The spiral plate guides the gas movement, increases the gas residence time, and the rotating flow promotes turbulent mixing of CO and air. Meanwhile, the three igniters located in the middle of the inner wall of the gas collection hood can ignite alternately to ensure that CO can burn completely at different flow rates, thus avoiding environmental pollution. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention from a first-person perspective.

[0014] Figure 2 This is a three-dimensional structural diagram of the present invention from a second perspective.

[0015] Figure 3 This is a schematic cross-sectional view of the furnace body of this utility model;

[0016] Figure 4 This is a cross-sectional view of the gas collection hood of this utility model.

[0017] In the diagram: 1. Furnace body; 2. Connecting block; 3. Second exhaust pipe; 4. Weighing device; 5. Reserved slot; 6. Inlet pipe; 7. Box body; 8. Gas collection hood; 9. First exhaust pipe; 10. Electric telescopic rod; 11. Auxiliary rod; 12. Connecting rod; 13. Partition plate; 14. Gas supply pipe; 15. Reserved hole; 16. Spiral tube; 17. Vent hole; 18. Ignition device; 19. Spiral plate; 20. Frame; 21. Cover plate; 22. Thermocouple. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-4 An iron ore reducing power testing device includes a furnace body 1. Cover plates 21 are hinged to the left and right sides of the top of the furnace body 1. A spiral tube 16 is fixedly connected to the upper end of the inner cavity of the furnace body 1. An electric telescopic rod 10 is fixedly connected to the back of the furnace body 1. A weighing device 4 is fixedly connected to the telescopic end of the electric telescopic rod 10. A connecting block 2 is fixedly connected to the front end of the bottom of the weighing device 4 via a connecting rod 12. Multiple thermocouples 22 distributed at equal angles are fixedly connected to the bottom of the connecting block 2. The furnace body 1 is threadedly connected to a housing 7, and the side walls and bottom of the housing 7 are provided with multiple equidistant ventilation holes 17. The lower end of the inner cavity of the furnace body 1 is fixedly connected to a partition 13, and the inner side of the partition 13 is provided with a reserved hole 15 that matches the housing 7. The inner surface of the partition 13 is fixedly connected to a gas supply pipe 14, and the top of the gas supply pipe 14 is connected to the bottom of the spiral tube 16 through a pipe. The upper left side of the furnace body 1 is connected to an air inlet pipe 6, and the right side of the air inlet pipe 6 is connected to the top of the spiral tube 16 through a pipe.

[0020] The outer wall of the box body 7 and the partition plate 13 work together to divide the inner cavity of the furnace body 1 into upper and lower parts, thus ensuring that all reducing gases enter from the vent hole 17 at the bottom of the box body 7 and flow out from the vent hole 17 on the side wall, ensuring full contact to complete the reduction.

[0021] With the cooperation of the connecting rod 12, the weighing device 4 can measure the weight of the iron ore in the box 7 in real time. The weight reduction of the iron ore in the box 7 after reduction can be measured by the weighing device 4. The experimental progress can be judged by the change in the weight of the iron ore, and the input of reducing gas can be controlled.

[0022] The electric telescopic rod 10 is retracted so that the bottom of the box 7 is 3-10cm below the partition 13. Finally, the cover 21 is closed so that the furnace body 1 is completely sealed.

[0023] An auxiliary rod 11 is fixedly connected to the telescopic end of the electric telescopic rod 10, and a frame 20 is fixedly connected to the fixed end of the electric telescopic rod 10. The auxiliary rod 11 is slidably connected to the inner side of the frame 20.

[0024] The auxiliary rod 11 and frame 20 can provide auxiliary support to prevent the telescopic end of the electric telescopic rod 10 from being affected by torque, thus preventing it from affecting its telescopic movement.

[0025] The inner side of the cover plate 21 is provided with a reserved groove 5 that is adapted to the connecting rod 12. The inner surface of the cover plate 21 located on the right side is connected to the first air outlet pipe 9.

[0026] The reserved slot 5 can seal the furnace body 1 completely after the two cover plates 21 are closed, thereby preventing gas leakage and ensuring the accuracy of the test.

[0027] After thermocouple 22 is turned on, the iron ore is heated to the set temperature (900-950℃). Then, reducing gas is injected from the inlet pipe 6 and enters the spiral tube 16 under the action of the pipe. The spiral tube 16 can extend the flow length of the gas in the cavity, which can fully absorb heat to complete the preheating and improve the reduction effect. In addition, the gas after reduction will also come into contact with the spiral tube 16 during the process of flowing to the first outlet pipe 9, further improving the preheating effect.

[0028] The end of the first vent pipe 9 is connected to the gas collection hood 8 via a pipe, and the right end of the top of the gas collection hood 8 is connected to the second vent pipe 3.

[0029] A pipe connector is fixedly connected to the surface of the pipe connecting the first vent pipe 9 and the gas collection hood 8, and a one-way pipe is fixedly connected to the other interface of the pipe connector.

[0030] Air can enter the gas collection hood 8 from the one-way pipe and the pipeline, thus achieving the mixing of CO and air.

[0031] The reducing gas entering from the inlet pipe 6 eventually flows from the gas delivery pipe 14 to the bottom of the partition 13, enters through the vent 17 at the bottom of the box 7, and after reduction, flows out through the vent 17 on the side of the box 7, and finally enters the gas collection hood 8 from the first outlet pipe 9.

[0032] A spiral plate 19 is fixedly connected inside the gas collecting hood 8, and an igniter 18 is fixedly connected to the side wall of the inner cavity of the gas collecting hood 8.

[0033] There are three igniters 18, and the three igniters 18 are evenly distributed in the middle position of the inner wall of the gas collecting hood 8.

[0034] Because the gas temperature is high, it flows upward along the spiral plate 19, increasing the gas residence time. The rotating flow promotes turbulent mixing of CO and air. At the same time, the three igniters 18 located in the middle of the inner wall of the gas collection hood 8 can ignite alternately to ensure that CO can burn completely at different flow rates, thus avoiding environmental pollution.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An iron ore reducing power testing apparatus, comprising a furnace body (1), characterized in that: The top left and right sides of the furnace body (1) are movably connected to cover plates (21) via hinges, and the upper end of the inner cavity of the furnace body (1) is fixedly connected to a spiral tube (16). The back of the furnace body (1) is fixedly connected to an electric telescopic rod (10), and the telescopic end of the electric telescopic rod (10) is fixedly connected to a weighing device (4). The front end of the bottom of the weighing device (4) is fixedly connected to a connecting block (2) via a connecting rod (12). The bottom of the connecting block (2) is fixedly connected to multiple thermocouples (22) distributed at equal angles. The bottom of the connecting block (2) is threadedly connected to a box body (7). The side wall and bottom of the box body (7) are provided with multiple equally spaced ventilation holes (17). The lower end of the inner cavity of the furnace body (1) is fixedly connected to a partition (13). The inner side of the partition (13) is provided with a reserved hole (15) that is compatible with the box body (7). The inner surface of the partition (13) is fixedly connected to a gas supply pipe (14). The top of the gas supply pipe (14) is connected to the bottom of the spiral tube (16) through a pipe. The upper end of the left side of the furnace body (1) is connected to an air inlet pipe (6). The right side of the air inlet pipe (6) is connected to the top of the spiral tube (16) through a pipe.

2. The iron ore reducing power testing apparatus according to claim 1, characterized in that: The telescopic end of the electric telescopic rod (10) is fixedly connected to an auxiliary rod (11), the fixed end of the electric telescopic rod (10) is fixedly connected to a frame (20), and the auxiliary rod (11) is slidably connected to the inner side of the frame (20).

3. The iron ore reducing power testing apparatus according to claim 1, characterized in that: The inner side of the cover plate (21) is provided with a reserved groove (5) that is compatible with the connecting rod (12). The inner surface of the cover plate (21) located on the right side is connected to the first air outlet pipe (9).

4. The iron ore reducing power testing apparatus according to claim 3, characterized in that: The end of the first vent pipe (9) is connected to the gas collection hood (8) via a pipe, and the right end of the top of the gas collection hood (8) is connected to the second vent pipe (3).

5. The iron ore reducing power testing apparatus according to claim 4, characterized in that: The gas collecting hood (8) is fixedly connected to a spiral plate (19), and an igniter (18) is fixedly connected to the side wall of the inner cavity of the gas collecting hood (8).

6. The iron ore reducing power testing apparatus according to claim 5, characterized in that: The number of igniters (18) is three, and the three igniters (18) are evenly distributed in the middle position of the inner wall of the gas collection hood (8).

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