Waste heat utilization device of chain grate rotary kiln

Abstract

The utility model relates to the technical field of waste heat utilization, in particular to a chain grate rotary kiln waste heat utilization device which comprises a box body, a tank body, a pipeline A, an input mechanism, an output mechanism, propeller blades and a driving mechanism. High-temperature waste gas generated by the grate rotary kiln can be sucked through the input mechanism, purified and then guided into the pipeline A. When the purified high-temperature waste gas flows in the pipeline A, part of heat is transferred to water in the box body to heat the water in the box body, waste heat utilization is achieved, and the waste heat utilization rate is increased. And then hot air with heat not completely utilized is guided into the tank body through the output mechanism to dry the green pellets in the tank body, the propeller blades rotate through the driving mechanism, and the green pellets in the tank body are stirred and conveyed when the propeller blades rotate, so that the pellets are uniformly heated, the drying effect of the pellets is improved, and the utilization rate of waste heat in the rotary kiln is increased.

Description

Technical Field

[0001] This utility model relates to the field of waste heat utilization technology, specifically to a waste heat utilization device for a chain grate rotary kiln. Background Technology

[0002] A rotary kiln with a chain grate is a continuous operation equipment used for roasting minerals. It is commonly used in the roasting process of iron ore pellets, ceramsite, or other non-metallic minerals. During the roasting process, the rotary kiln continuously generates high-temperature waste gas. In existing technologies, when recovering and utilizing the waste heat from the high-temperature waste gas generated by the rotary kiln with a chain grate, the waste gas generated by the rotary kiln can be drawn out through pipelines for purification and then reintroduced into the chain grate to dry the pellets, thereby saving energy.

[0003] The movement of the pellets on the chain grate is mainly translational. The pellets remain relatively stationary in contact with the grate bed. Therefore, when the high-temperature waste gas from the rotary kiln is introduced into the chain grate to dry the pellets, the pellets are easily heated locally, which affects the drying effect. Furthermore, some of the heat energy of the high-temperature waste gas is not fully utilized in the direct transfer process, which affects the utilization rate of the waste heat of the rotary kiln. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a waste heat utilization device for a rotary kiln using a chain grate machine, so as to solve the technical problems in the prior art where, when the waste gas in the rotary kiln is introduced into the chain grate machine to dry the pellets, the pellets are in contact with the grate bed and remain relatively stationary, the pellets are easily heated locally, which affects the drying effect of the pellets, and the waste heat utilization rate of the rotary kiln is also low.

[0005] This utility model is achieved through the following technical solution:

[0006] A waste heat utilization device for a chain grate rotary kiln includes a tank containing water and a vessel arranged on top of the tank along the length of the tank, with a pipe A horizontally passing through the tank.

[0007] The pipe A is connected to an input mechanism for inputting hot air into it, and the pipe B located in the box is equipped with an output mechanism that connects the pipe B and the tank. The number of output mechanisms is at least two.

[0008] The inner wall of the tank is provided with a horizontally spiraling propeller blade, and the tank is provided with a drive mechanism for driving the propeller blade to rotate.

[0009] Furthermore, the output mechanism includes a pipe B with one end connected to the interior of the pipe A, the other end of the pipe B being closed and extending upwards out of the housing, and two pipes C symmetrically arranged on the pipe B, with the two ends of the pipes C respectively connected to the interior of the pipe B and the tank.

[0010] Valve A and a flow control valve are installed on the pipeline B.

[0011] Furthermore, both ends of the pipe A extend out of the housing, and a valve B is installed at the end of the pipe A that is not connected to the input mechanism.

[0012] Furthermore, the input mechanism includes a fan for drawing exhaust gas from inside the rotary kiln of the chain grate machine, and the output end of the fan is connected to a dust collector, the output end of which is connected to the end of the pipe A.

[0013] Furthermore, the drive mechanism includes a drive rod fixedly connected to the propeller blade, with one end of the drive rod extending out of the tank body;

[0014] A bracket is fixedly installed on the top of the box, and a power source is installed on the bracket. The output end of the power source is connected to one end of the drive rod that extends out of the tank.

[0015] The end of the tank is fixed with a support plate for supporting the rotation of the drive rod. The side of the support plate is not in complete contact with the inner wall of the tank, so as to form a discharge port between the support plate and the inner wall of the tank.

[0016] Furthermore, a turning guide plate is installed at the discharge end of the tank, and the turning guide plate is in the shape of a slide.

[0017] Furthermore, along the helical direction of the propeller blade, several through holes are formed on the surface of the propeller blade, and the surface of the propeller blade has several protrusions.

[0018] Furthermore, a groove is provided on the top of the housing, and both valve A and the flow control valve are installed in the groove.

[0019] The beneficial effects of this utility model are as follows:

[0020] In use, the waste heat utilization device for the rotary kiln of the chain grate machine can draw in the high-temperature waste gas generated by the rotary kiln through the input mechanism, purify it, and then introduce it into the pipe A. When the purified high-temperature waste gas flows in the pipe A, some of the heat is transferred to the water in the tank, heating the water in the tank and realizing waste heat utilization. Then, the hot air whose heat was not fully utilized is introduced into the tank through the output mechanism to dry the green pellets in the tank. The propeller blades of the drive mechanism rotate, and when the propeller blades rotate, they stir and transport the green pellets in the tank, so that the pellets are heated evenly, improving the drying effect of the pellets and the utilization rate of waste heat in the rotary kiln.

[0021] During the rotary kiln roasting process, the waste gas generated by the rotary kiln is led out through pipelines and pre-dried in a separate heat exchange device, instead of directly introducing the waste gas into the chain grate machine for drying the pellets. This has the following advantages:

[0022] First, energy conservation and emission reduction: effectively utilizing the heat in the high-temperature exhaust gas emitted by the rotary kiln reduces energy consumption and environmental pollution.

[0023] Second, more thorough drying: The pellets are stirred in a separate drying device, which makes the pellets heat evenly and improves the drying effect.

[0024] Third, flexibility: This design provides greater system flexibility, allowing for adjustment of exhaust gas flow and drying degree according to production needs, thus maintaining stable pellet quality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the waste heat utilization device for the rotary kiln of the chain grate machine according to this utility model.

[0026] Figure 2 This is a schematic diagram showing the connection between the turning guide plate and the tank body of the waste heat utilization device for the rotary kiln of the chain grate machine according to this utility model.

[0027] Figure 3 This is a schematic diagram showing the connection between pipe B and pipe A in the waste heat utilization device of the rotary kiln of the chain grate machine according to this utility model.

[0028] Figure 4 This is a cross-sectional view of the tank body of the waste heat utilization device for the rotary kiln of the chain grate machine according to this utility model.

[0029] In the diagram: 1-box, 2-tank, 3-pipe A;

[0030] 4-Input mechanism, 41-Fan, 42-Dust collector;

[0031] 5-Output mechanism, 51-Pipe B, 52-Pipe C, 53-Valve A, 54-Flow control valve;

[0032] 6-Propeller blade, 7-Drive mechanism, 71-Drive rod, 72-Support plate, 73-Discharge port, 74-Bracket, 75-Power source; 8-Valve B, 9-Turn guide plate, 10-Through hole, 11-Protrusion, 12-Groove. Detailed Implementation

[0033] Typical embodiments embodying the features and advantages of this utility model will be specifically described in the following description. It should be understood that this utility model can have various variations in different embodiments, all of which do not depart from the scope of this utility model, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this utility model.

[0034] In the description of this application, the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] Please see Figures 1 to 3 This utility model provides a technical solution: a waste heat utilization device for a chain grate rotary kiln, including a box 1 containing water and a tank 2 arranged on the top of the box 1 along the length of the box 1. A pipe A3 is horizontally inserted in the box 1, and the connection between the pipe A3 and the box 1 is sealed.

[0036] The pipe A3 is connected to an input mechanism 4 for introducing hot air into it. The input mechanism 4 includes a fan 41 for drawing exhaust gas from the rotary kiln of the chain grate machine. The input end of the fan 41 is equipped with a hood, which is connected to the rotary kiln of the chain grate machine. The output end of the fan 41 is connected to a dust collector 42, which is a high-temperature resistant pulse bag dust collector. The output end of the dust collector 42 is connected to the end of the pipe A3.

[0037] Please see Figures 1 to 3 The portion of the pipe B51 located within the housing 1 is equipped with an output mechanism 5 that connects the pipe B51 and the tank 2, and the number of output mechanisms 5 is at least two.

[0038] The output mechanism 5 includes a pipe B51 with one end connected to the inside of the pipe A3, the other end of the pipe B51 being closed and extending upwards out of the box 1. On the pipe B51, two pipes C52 are symmetrically arranged with respect to the center line of the pipe B51. The two ends of the pipes C52 are connected to the inside of the pipe B51 and the tank 2, respectively.

[0039] The pipe B51 is equipped with valve A53 and flow control valve 54. The flow control valve 54 is a GcD941W high-temperature flue gas valve. The top of the box 1 is provided with a groove 12. Both valve A53 and flow control valve 54 are installed in the groove 12 to reduce the vertical distance between the tank 2 and the box 1, thereby reducing the volume of the device and making the device structure more compact.

[0040] Please see Figure 1 , Figure 2 and Figure 4 The inner wall of the tank 2 is provided with a horizontally spiral propeller blade 6, and the tank 2 is provided with a drive mechanism 7 for driving the propeller blade 6 to rotate. The drive mechanism 7 includes a drive rod 71 fixedly connected to the propeller blade 6, and one end of the drive rod 71 extends out of the tank 2.

[0041] A bracket 74 is fixedly installed on the top of the box 1, and a power source 75 is installed on the bracket 74. The power source 75 is an electric motor, and the output end of the power source 75 is connected to one end of the drive rod 71 that extends out of the tank 2.

[0042] A support plate 72 for supporting the rotation of the drive rod 71 is fixed at the end of the tank body 2. The side of the support plate 72 is not in complete contact with the inner wall of the tank body 2, so as to form a discharge port 73 between the support plate 72 and the inner wall of the tank body 2. A turning guide plate 9 is installed at the discharge end of the tank body 2. The turning guide plate 9 is in the shape of a slide. The discharge point of the ball is changed from the end of the tank body 2 to the side of the tank body 2 by the turning guide plate 9.

[0043] In operation, the waste heat utilization device for the rotary kiln of this utility model utilizes the fan 41 to draw out the high-temperature waste gas generated by the rotary kiln and introduce it into the dust collector 42 for purification. After purification by the dust collector 42, the high-temperature waste gas is introduced into the pipe A3. When the purified high-temperature waste gas flows in the pipe A3, some of the heat is transferred to the water in the housing 1, heating the water in the housing 1 and realizing waste heat utilization. Furthermore, the valve A53 controls the opening of the pipe B51, which is away from the input end of the pipe A3, to release the heat from the pipe A3. The fully utilized hot air is introduced into the tank 2 through the cooperation of the pipes B51 and C52 to dry the green pellets in the tank 2. The power source 75 drives the drive rod 71 to rotate, and the rotation of the drive rod 71 drives the propeller blade 6 to rotate. When the propeller blade 6 rotates, it stirs the green pellets in the tank 2, so that the pellets are heated evenly and the utilization rate of waste heat from the brick kiln is improved. Finally, the pellets are moved to the discharge port 73 by the propeller blade 6 for discharge. The technical principle is similar to that of a auger conveyor.

[0044] When the pellets are conveyed close to the discharge port 73, another valve A53 controls the opening of the pipe B51 near the input end of the pipe A3, and through the corresponding flow control valve 54, controls the output of hot air in the front pipe B51 to be less than the output of the rear pipe B51, thereby enabling secondary drying of the pellets in the tank 2. Since the front pipe B51 is close to the input end of the pipe A3, the heat entering the front pipe B51 is higher than the heat entering the rear pipe B51, which can further improve the drying effect on the pellets.

[0045] During the rotary kiln roasting process, the waste gas generated by the rotary kiln is led out through pipelines and pre-dried in a separate heat exchange device, instead of directly introducing the waste gas into the chain grate machine for drying the pellets. This has the following advantages:

[0046] First, energy conservation and emission reduction: effectively utilizing the heat in the high-temperature exhaust gas emitted by the rotary kiln reduces energy consumption and environmental pollution.

[0047] Second, more thorough drying: The pellets are stirred in a separate drying device, which makes the pellets heat evenly and improves the drying effect.

[0048] Third, flexibility: This design provides greater system flexibility, allowing for adjustment of exhaust gas flow and drying degree according to production needs, thus maintaining stable pellet quality.

[0049] Please see Figure 1 and Figure 3 Both ends of the pipe A3 extend out of the housing 1. A valve B8 is installed at the end of the pipe A3 that is not connected to the input mechanism 4. Both valves A53 and B8 are butterfly valves. The opening or closing of the end of the pipe A3 and the pipe B51 are controlled by valves B8 and A53 respectively. When the green pellets do not need to be dried, the pipe B51 can be closed to draw out the hot air in the pipe A3 that has not been fully utilized for power generation or other purposes.

[0050] Please see Figure 4 Along the helical direction of the propeller blade 6, several through holes 10 are provided on the surface of the propeller blade 6. The through holes 10 facilitate the flow of hot air in the tank 2 to dry the pellets. The surface of the propeller blade 6 has several protrusions 11. The protrusions 11 can increase the gap between the pellets and the surface of the propeller blade 6 and the friction between the propeller blade 6 and the pellets, so as to further stir the pellets and improve the heat drying effect of the pellets.

[0051] Finally, it should be noted that the above embodiments are only preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A waste heat utilization device for a chain grate rotary kiln, characterized in that: It includes a tank (1) containing water, and a container (2) arranged on top of the tank (1) along the length of the tank (1), with a pipe A (3) running horizontally through the tank (1); The pipe A (3) is connected to an input mechanism (4) for inputting hot air into it. The part of the pipe A (3) located in the box (1) is equipped with an output mechanism (5) that connects the pipe A (3) and the tank (2). The number of output mechanisms (5) is at least two. The inner wall of the tank (2) is provided with a horizontally spiral propeller blade (6), and the tank (2) is provided with a drive mechanism (7) for driving the propeller blade (6) to rotate.

2. The waste heat utilization device for the chain grate rotary kiln according to claim 1, characterized in that: The output mechanism (5) includes a pipe B (51) with one end connected to the inside of the pipe A (3), the other end of the pipe B (51) is closed and extends upward out of the box (1), and two pipes C (52) are symmetrically arranged on the pipe B (51), with the two ends of the pipe C (52) connected to the inside of the pipe B (51) and the tank (2) respectively. Valve A (53) and flow control valve (54) are installed on the pipeline B (51).

3. The waste heat utilization device for the chain grate rotary kiln according to claim 1, characterized in that: The two ends of the pipe A (3) extend out of the box (1) respectively, and the end of the pipe A (3) that is not connected to the input mechanism (4) is equipped with a valve B (8).

4. The waste heat utilization device for the chain grate rotary kiln according to claim 1, characterized in that: The input mechanism (4) includes a fan (41) for drawing out the waste gas inside the rotary kiln of the chain grate machine. The output end of the fan (41) is connected to a dust collector (42), and the output end of the dust collector (42) is connected to the end of the pipe A (3).

5. The waste heat utilization device for the rotary kiln of the chain grate machine according to claim 1, characterized in that: The drive mechanism (7) includes a drive rod (71) fixedly connected to the propeller blade (6), one end of which extends out of the tank body (2); A bracket (74) is fixedly provided on the top of the box (1), and a power source (75) is installed on the bracket (74). The output end of the power source (75) is connected to one end of the drive rod (71) that extends out of the tank (2). The end of the tank (2) is fixed with a support plate (72) for supporting the rotation of the drive rod (71). The side of the support plate (72) is not in complete contact with the inner wall of the tank (2) to form a discharge port (73) between the support plate (72) and the inner wall of the tank (2).

6. The waste heat utilization device for the chain grate rotary kiln according to claim 1, characterized in that: The discharge end of the tank (2) is equipped with a turning guide plate (9), which is in the shape of a slide.

7. The waste heat utilization device for the chain grate rotary kiln according to claim 1, characterized in that: Along the helical direction of the propeller blade (6), a plurality of through holes (10) are provided through the surface of the propeller blade (6), and the surface of the propeller blade (6) has a plurality of protrusions (11).

8. The waste heat utilization device for the chain grate rotary kiln according to claim 2, characterized in that: The top of the housing (1) is provided with a groove (12), and the valve A (53) and the flow control valve (54) are both installed in the groove (12).

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