Internal combustion decarburization rotary kiln internal air supplement system

Abstract

The utility model relates to the technical field of decarburization kilns, in particular to an air supplement system in an internal combustion decarburization rotary kiln, which comprises a fan arranged outside the internal combustion decarburization rotary kiln and used for supplementing air into the internal combustion decarburization rotary kiln, and an air outlet of the fan is connected with the inner wall of the decarburization kiln through an air pipeline. The fan is connected with the inner wall of the decarbonization kiln in a multi-point mode through a plurality of air branch pipes, each air branch pipe is provided with an electric switch valve used for controlling air flow, and the fan and the air pipelines synchronously rotate along with the internal combustion decarbonization rotary kiln. A switch system capable of controlling the electric switch valve to be opened and closed according to the position of the air branch pipe is further arranged outside the internal combustion decarbonization rotary kiln, the fan and the electric switch valve are both in control connection with a control system, and the switch system is in signal connection with the control system. The on-off of the air branch pipe is controlled through the position of the air branch pipe, so that air is supplemented from the place where materials exist in the kiln, and the carbon-containing materials are burnt sufficiently and decarbonized thoroughly.

Description

Technical Field

[0001] The utility model relates to the technical field of decarbonization kilns, in particular to an air supply system in an internal combustion decarbonization rotary kiln. Background Art

[0002] Some minerals contain a certain amount of carbon, such as coal gangue, carbon gold ore, coal vanadium ore and other minerals. Carbon-containing minerals are usually decarbonized during use to remove carbon from the minerals to enhance the stability of the product. There are many methods for decarbonization. Combustion decarbonization or roasting decarbonization is a commonly used decarbonization method. The internal combustion decarbonization rotary kiln is a device for mineral decarbonization. Carbon-containing minerals are burned in the kiln, and the carbon in the mineral is removed by burning into gas. In addition to the heat released by its own combustion, it is also necessary to add heat to the kiln, such as introducing high-temperature hot air or flame combustion. The combustion process consumes oxygen, and the oxygen content of the atmosphere in the kiln has an important influence on the decarbonization effect. The sectional rotary kiln disclosed in CN203323546U has side ventilation of the kiln, and the combustion effect is not good, which affects the decarbonization effect; the coal gangue decarbonization machine disclosed in CN218994056U has multiple bellows arranged at the bottom of the trolley plate, and each bellows is connected to a fan and multiple pipes, and its structure is relatively complex. Utility Model Content

[0003] The utility model solves the problem of poor air supply effect in an internal combustion decarbonization rotary kiln and provides an air supply system in an internal combustion decarbonization rotary kiln which can adjust the air inlet point according to the rotation position of the rotary kiln and has a simple structure.

[0004] In order to solve the above technical problems, the utility model includes a fan arranged on the outside of the internal combustion decarbonization rotary kiln and used to supply air to the inside of the internal combustion decarbonization rotary kiln. The air outlet of the fan is connected to the inner wall of the decarbonization kiln through an air pipeline. Its structural characteristics are: the fan is connected to the inner wall of the decarbonization kiln at multiple points through multiple air branches, and each of the air branches is provided with an electric switch valve for controlling the air flow. The fan and the air pipeline both rotate synchronously with the internal combustion decarbonization rotary kiln. The outside of the internal combustion decarbonization rotary kiln is also provided with a switch system that can control the opening and closing of the electric switch valve according to the position of the air branch. The fan and the electric switch valve are both connected to the control system, and the switch system is connected to the control system signal.

[0005] After adopting the above structure, when the carbon-containing minerals are burned and decarbonized in the internal combustion decarbonization rotary kiln, air is added to the kiln through the fan to assist combustion, so that the carbon in the minerals is fully burned and removed; the carbon-containing minerals are in the chamber surrounded by the inner wall of the decarbonization kiln, and the air discharged by the fan enters the internal combustion decarbonization rotary kiln through the air branch pipe, and the air branch pipe is provided with an electric switch valve. During the rotation of the internal combustion decarbonization rotary kiln, the fan and the air pipeline rotate accordingly. The outside of the internal combustion decarbonization rotary kiln is provided with a switch system for controlling the opening and closing of the electric switch valve, and the electric switch valve is connected to the control system, and the switch system is connected to the control system. System signal connection, the switch system can control the opening and closing of the electric switch valve according to the position of the air branch pipe. During the rotation of the internal combustion decarbonization rotary kiln, when the air outlet at the connection between the air branch pipe and the inner wall of the decarbonization kiln rotates to the vicinity of the lowest point of the inner wall of the decarbonization kiln, the switch system opens the electric switch valve on the air branch pipe through the control system, and closes the electric switch valves of other air branches at the same time. The air is blown into the internal combustion decarbonization rotary kiln from bottom to top, that is, from where the material exists in the kiln. The air supply and oxygen supply effect is good, the particles can be fully burned, the decarbonization effect is good, and the air volume is saved. The fan of the air supply system is connected to the inner wall of the decarbonization kiln through the air pipeline, and there is no need to set up a bellows, and the structure is simple.

[0006] The fan is fixed to the outer wall of the decarburization kiln of the internal combustion decarburization rotary kiln through a bracket, and the air outlet of the fan is connected to an air main pipe arranged around the circumference of the outer wall of the decarburization kiln, one end of each of the air branch pipes is connected to the air main pipe, and the other end of each of the air branch pipes is connected to the inner wall of the decarburization kiln.

[0007] At least three air branch pipes are provided, and the air outlets at the connection between each of the air branch pipes and the inner wall of the decarbonization kiln are evenly distributed along the cross section of the inner wall of the decarbonization kiln.

[0008] The air outlet of each of the air branch pipes is provided with an air outlet baffle which is arranged inside the inner wall of the decarbonization kiln to prevent materials from entering the air branch pipe. The air outlet baffle is fixedly connected to the inner wall of the decarbonization kiln and is arranged along the length direction of the internal combustion decarbonization rotary kiln. The air outlet baffle is provided with a plurality of air outlet holes for air to enter the internal combustion decarbonization rotary kiln.

[0009] The air branch pipe is formed by connecting an external air pipe and an internal air pipe. The external air pipe is arranged outside the internal combustion decarbonization rotary kiln, and the internal air pipe is arranged in the space between the inner wall and the outer wall of the decarbonization kiln. The electric switch valve is arranged on the external air pipe.

[0010] The switch system includes a photoelectric switch corresponding to the electric switch valve and used to control the opening and closing of the electric switch valve. The photoelectric switch is installed on the air main pipe. A fixed receiver is provided outside the internal combustion decarbonization rotary kiln for receiving the optical signal of the photoelectric switch.

[0011] The control system is a PLC control module.

[0012] The fan is a variable frequency fan, and the control system is also connected to an industrial wireless remote control signal for controlling the fan frequency.

[0013] The utility model discloses an air supply system for an internal combustion decarbonization rotary kiln. The fan and the air pipeline are installed on the outer wall of the rotary kiln, and the photoelectric switch is installed on the air main pipe. When the internal combustion decarbonization rotary kiln rotates, the fan, the air pipeline and the photoelectric switch rotate accordingly. The receiver is fixed in position. When the receiver receives different photoelectric switch signals, the electric switch valve on the air branch pipe with the air outlet near the lowest point of the inner wall of the decarbonization kiln is controlled to open, and the other electric switch valves are closed. Air is blown into the kiln from where materials exist, so that the air supply and oxygenation effect is good, the materials are fully burned, the decarbonization effect is good, and the air volume is saved. The frequency and air volume of the fan are adjusted according to the amount of materials to be processed, so that the air supply volume is adapted to the processing volume, and the decarbonization effect is stable. The fan is connected to the internal combustion decarbonization rotary kiln through the air pipeline, and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 is a schematic diagram of the connection between the external air pipe and the internal air pipe;

[0016] Figure 3 It is a schematic diagram of the connection between the internal air pipe and the inner wall of the decarbonization kiln;

[0017] Figure 4 It is a connection diagram of the fan, electric switch valve, control element and PLC control module;

[0018] Figure 5 for Figure 1 Schematic diagram of the internal combustion decarbonization rotary kiln after rotating a certain angle;

[0019] In the figure: 1, internal combustion decarbonization rotary kiln; 11, inner wall of decarbonization kiln; 12, outer wall of decarbonization kiln; 2, air main pipe; 21, first air branch pipe; 211, first external air pipe; 212, first internal air pipe; 213, first electric switch valve; 22, second air branch pipe; 221, second external air pipe; 222, second internal air pipe; 223, second electric switch valve; 23, third air branch pipe; 231, third external air pipe; 232, third internal air pipe Air pipe; 233, third electric switch valve; 241, first photoelectric switch; 242, second photoelectric switch; 243, third photoelectric switch; 3, fan; 31, bracket; 4, receiver; 5, first short tube; 51, first flange; 6, second short tube; 61, second flange; 7, gasket; 8, third short tube; 9, air outlet baffle; 91, baffle one; 92, baffle two; 93, air outlet; 10, industrial wireless remote control; 100, PLC control module. DETAILED DESCRIPTION

[0020] Figure 1 , 5 The structural schematic diagram is a cross-sectional schematic diagram of the internal combustion decarbonization rotary kiln 1, wherein the cross-section referred to herein is a plane perpendicular to the axial direction (i.e., length direction) of the internal combustion decarbonization rotary kiln 1, and the internal combustion decarbonization rotary kiln 1 comprises a decarbonization kiln inner wall 11 and a decarbonization kiln outer wall 12, and a heat-insulating material (not shown in the figure) is arranged between the decarbonization kiln inner wall 11 and the decarbonization kiln outer wall 12. The shape of the decarbonization kiln inner wall 11 in the figure comprises a plurality of raised sections and recessed sections, which is beneficial for the material to tumble in the kiln, and reference may be made to CN215983888U.

[0021] Reference Figure 1-5 An air supply system for an internal combustion decarbonization rotary kiln includes a fan 3 for supplying air to the internal combustion decarbonization rotary kiln 1, the air outlet of the fan 3 is connected to the inner wall 11 of the decarbonization kiln through an air pipeline, and an electric switch valve for controlling the air flow is provided on the air pipeline. The fan 3 and the air pipeline rotate synchronously with the internal combustion decarbonization rotary kiln 1. The air supply system also includes a switch system for controlling the opening and closing of the electric switch valve. The fan 3 and the electric switch valve are connected to the control system, and the switch system is connected to the control system signal. The fan 3 adopts a variable frequency fan, and the fan 3 is fixedly installed on the outer wall 12 of the decarbonization kiln through a bracket 31. The control system is a PLC control module 100.

[0022] Reference Figure 1-3 5. The air pipeline includes a plurality of air branches connected to the inner wall 11 of the decarbonization kiln. The fan 3 is connected to the inner wall 11 of the decarbonization kiln at multiple points through the plurality of air branches. Specifically, the air outlet of the fan 3 is connected to the air main pipe 2. Figure 1 , 5As shown, the main air pipe 2 is located outside the internal combustion decarbonization rotary kiln 1 and is arranged around the circumference of the outer wall 12 of the decarbonization kiln. The main air pipe 2 can be supported on the outer wall 12 of the decarbonization kiln through a supporting structure, which is not shown in the figure. The air branch pipes include a first air branch pipe 21, a second air branch pipe 22, and a third air branch pipe 23. One end of each air branch pipe is connected to the main air pipe 2, and the other end of each air branch pipe is connected to the inner wall 11 of the decarbonization kiln. The air outlets at the connection between the air branch pipes and the inner wall 11 of the decarbonization kiln are evenly distributed along the cross-section of the inner wall 11 of the decarbonization kiln. At least three air branch pipes are arranged, and four, five or other numbers of air branch pipes can be arranged according to the diameter of the internal combustion decarbonization rotary kiln 1. Figure 1 , 5 As shown, each air branch pipe is formed by connecting an external air pipe and an internal air pipe, the external air pipe is located outside the internal combustion decarbonization rotary kiln 1, and the internal air pipe is located in the space between the inner wall 11 of the decarbonization kiln and the outer wall 12 of the decarbonization kiln, one end of the external air pipe is connected to the air main pipe 2, the other end of the external air pipe is connected to one end of the internal air pipe, and the other end of the internal air pipe is connected to the inner wall 11 of the decarbonization kiln. Specifically, the first air branch pipe 21 is formed by connecting the first external air pipe 211 and the first internal air pipe 212, the second air branch pipe 22 is formed by connecting the second external air pipe 221 and the second internal air pipe 222, and the third air branch pipe 23 is formed by connecting the third external air pipe 231 and the third internal air pipe 232; Figure 1 , 5 As shown, the electric switch valve is arranged on the external air pipe. Specifically, the first external air pipe 211 is provided with a first electric switch valve 213, the second external air pipe 221 is provided with a second electric switch valve 223, and the third external air pipe 231 is provided with a third electric switch valve 233. The electric switch valve can be an electric valve such as an electric ball valve. When the internal combustion decarbonization rotary kiln 1 rotates, the fan 3 and the air pipeline rotate synchronously with the internal combustion decarbonization rotary kiln 1. The external air pipe and the internal air pipe can be detachably connected, such as Figure 2 As shown, taking the third external air pipe 231 and the third internal air pipe 232 as an example, one end of the third external air pipe 231 is fixedly connected to the first short pipe 5, and the first short pipe 5 is provided with a first flange 51. One end of the third internal air pipe 232 is fixedly connected to the second short pipe 6, and the second short pipe 6 is provided with a second flange 61. The second short pipe 6 is fixed to the outer wall 12 of the decarbonization kiln. The first flange 51 and the second flange 61 are connected by a combination of bolts and nuts. A gasket 7 is provided between the connecting end faces of the first flange 51 and the second flange 61. The flange connection method is common knowledge in this field. Figure 3As shown, the connection between the air branch pipe and the inner wall 11 of the decarbonization kiln is illustrated by taking the third internal air pipe 232 as an example. The inner wall 11 of the decarbonization kiln is fixedly connected with a third short pipe 8. The third internal air pipe 232 is fixedly connected with the third short pipe 8. The connection between the third short pipe 8 and the inner wall 11 of the decarbonization kiln is the air outlet of the third air branch pipe 23. The position of the air outlet is provided with an air outlet baffle 9 for preventing the material in the internal combustion decarbonization rotary kiln 1 from entering the third air branch pipe 23. The air outlet baffle 9 is arranged inside the inner wall 11 of the decarbonization kiln. The baffle 9 is fixedly connected to the inner wall 11 of the decarbonization kiln. The air outlet baffle 9 is arranged along the length direction (i.e., axial direction) of the internal combustion decarbonization rotary kiln 1. A plurality of air outlet holes 93 are arranged on the air outlet baffle 9. The air outlet holes 93 are distributed along the length direction of the air outlet baffle 9. External air enters the internal combustion decarbonization rotary kiln 1 through the plurality of air outlet holes 93, so that air enters the internal combustion decarbonization rotary kiln 1 in the length direction, and the air intake is more uniform, so that the materials at different positions in the kiln can fully contact with the air, the materials burn more fully, and the decarbonization effect is improved; Figure 3 As shown, the air outlet baffle 9 is formed by a baffle 1 91 and a baffle 2 92 fixedly connected, and the air outlet hole 93 is opened on the baffle 2 92. Of course, the air outlet hole 93 can also be opened on the baffle 1 91, and the air outlet baffle 9 can also use a flat plate.

[0023] like Figure 1 , 4 , 5, the switch system includes a photoelectric switch corresponding to the electric switch valve and used to control the opening and closing of the electric switch valve. The photoelectric switch is a component that can emit light signals. Three electric switch valves are arranged on the air pipeline. The switch system includes a first photoelectric switch 241, a second photoelectric switch 242, and a third photoelectric switch 243, a total of three photoelectric switches. Figure 1 , 5As shown, three photoelectric switches are installed on the air main pipe 2, and the three photoelectric switches are evenly distributed along the circumference of the air main pipe 2. The photoelectric switches rotate synchronously with the internal combustion decarbonization rotary kiln 1; a receiver 4 with a fixed position for receiving the photoelectric switch signal is provided outside the internal combustion decarbonization rotary kiln 1. The fan 3, the first electric switch valve 213, the second electric switch valve 223, and the third electric switch valve 233 are all connected to the PLC control module 100 for control. The first photoelectric switch 241, the second photoelectric switch 242, the third photoelectric switch 243, and the receiver 4 are all connected to the PLC control module 100 for signal. The receiver 4 transmits the received photoelectric switch signal to the PLC control module 100. The PLC control module 100 controls the opening and closing of the electric switch valves on different air branches, so the switch system can control the opening and closing of the electric switch valves according to the position of the air branch. The PLC control module 100 is also connected to the industrial wireless remote controller 10 (i.e., the transmitter) for controlling the frequency of the fan 3. For example, if an industrial wireless remote controller 10 capable of setting 16 working frequency bands of the fan 3 is selected, the industrial wireless remote controller 10 transmits the signal for controlling the frequency of the fan 3 to the PLC control module 100, and the PLC control module 100 adjusts the frequency of the fan 3 so that the air output of the fan 3 is adapted to the amount of material in the kiln.

[0024] Working process: Carbon-containing materials enter the internal combustion decarbonization rotary kiln 1. In an atmosphere of high temperature and oxygen, the carbon-containing materials burn and the contained carbon is burned and removed. During the decarbonization process, air needs to be added to the kiln to assist combustion in order to improve the decarbonization effect. According to the amount of material processed in the internal combustion decarbonization rotary kiln 1, the frequency of the fan 3 is set through the industrial wireless remote control 10. The industrial wireless remote control 10 transmits the signal to the PLC control module 100. The PLC control module 100 adjusts the frequency of the fan 3 so that the frequency and air volume of the fan 3 are adapted to the amount of material in the kiln. When the internal combustion decarbonization rotary kiln 1 rotates, the fan 3 and the air pipeline rotate synchronously therewith. The air main pipe 2, the three photoelectric switches installed on the air main pipe 2, the three air branch pipes, and the three electric switch valves installed on the air branch pipe rotate synchronously with the internal combustion decarbonization rotary kiln 1; the air branch pipe rotates with the inner wall 11 of the decarbonization kiln. The air outlet at the connection is the air supply point, so there are three air supply points in total. During the rotation of the internal combustion decarbonization rotary kiln 1, the receiver 4 can receive the light signals of the three photoelectric switches in sequence, and the receiver 4 transmits the received photoelectric switch signal to the PLC control module 100. The PLC control module 100 controls the electric switch valve on the air branch pipe where the air outlet near the lowest point of the inner wall 11 of the decarbonization kiln is located to be in the open state according to the signal of the receiver 4, and the electric switch valves on the other two air branches are in the closed state. Specifically, the photoelectric switch rotates with the internal combustion decarbonization rotary kiln 1. When the receiver 4 receives the first photoelectric switch When the receiver 4 receives the signal of the second photoelectric switch 242, the first electric switch valve 213 is opened, and the second electric switch valve 223 and the third electric switch valve 233 are in the closed state; the internal combustion decarbonization rotary kiln 1 continues to rotate, and when the receiver 4 receives the signal of the second photoelectric switch 242, the second electric switch valve 223 is opened, and the first electric switch valve 213 is closed at the same time; the internal combustion decarbonization rotary kiln 1 continues to rotate, and when the receiver 4 receives the signal of the third photoelectric switch 243, the third electric switch valve 233 is opened, and the second electric switch valve 223 is closed; the internal combustion decarbonization rotary kiln 1 continues to rotate, and when the receiver 4 receives the signal of the first photoelectric switch 24 1, open the first electric switch valve 213, close the third electric switch valve 233, and circulate in sequence. During the decarbonization process, the fan 3 is always running, and the air exhausted by the fan 3 only enters through the air branch pipe whose air supply point is located near the lowest point of the inner wall 11 of the decarbonization kiln, and the other air branches are closed. The materials in the internal combustion decarbonization rotary kiln 1 are at the bottom of the inner wall 11 of the decarbonization kiln, so the air enters the kiln from where the materials exist. The advantage of such air supply is that the air can fully contact with the materials, making the combustion more complete, the decarbonization more thorough, the decarbonization effect more stable, the air utilization rate higher, and there is no need to supply a large amount of air to the kiln, saving energy.

[0025] The utility model discloses an air supply system for an internal combustion decarbonization rotary kiln. The fan, air pipeline and photoelectric switch rotate synchronously with the internal combustion decarbonization rotary kiln. The receiver is fixed in position and has a simple structure. During the rotation of the internal combustion decarbonization rotary kiln, the receiver can sequentially receive signals from different photoelectric switches. The on and off of different air branches are controlled according to the photoelectric switch signals received by the receiver, so that air enters from where materials exist in the kiln, the air is fully in contact with the materials, the materials are fully burned, and the decarbonization is more thorough. The frequency and air supply volume of the fan are adjusted according to the amount of materials processed in the kiln, so that the air supply volume is adapted to the amount of materials, the decarbonization effect is improved, and energy consumption is saved.

Claims

1. An air supply system for an internal combustion decarbonization rotary kiln, comprising a fan (3) arranged outside the internal combustion decarbonization rotary kiln (1) for supplying air to the inside of the internal combustion decarbonization rotary kiln (1), wherein the air outlet of the fan (3) is connected to the inner wall (11) of the decarbonization kiln through an air pipeline, and wherein: The fan (3) is connected to the inner wall (11) of the decarbonization kiln at multiple points via multiple air branch pipes, each of the air branch pipes is provided with an electric switch valve for controlling the air flow, the fan (3) and the air pipeline both rotate synchronously with the internal combustion decarbonization rotary kiln (1), and the outside of the internal combustion decarbonization rotary kiln (1) is also provided with a switch system capable of controlling the opening and closing of the electric switch valve according to the position of the air branch pipe, the fan (3) and the electric switch valve are both connected to the control system, and the switch system is connected to the control system signal.

2. The internal combustion decarbonization rotary kiln air supply system according to claim 1 is characterized by: The fan (3) is fixed to the outer wall (12) of the decarburization kiln (1) of the internal combustion decarburization rotary kiln (1) via a bracket (31); the air outlet of the fan (3) is connected to an air main pipe (2) arranged around the circumference of the outer wall (12) of the decarburization kiln; one end of each of the air branch pipes is connected to the air main pipe (2); and the other end of each of the air branch pipes is connected to the inner wall (11) of the decarburization kiln.

3. The internal combustion decarbonization rotary kiln air supply system according to claim 2 is characterized by: At least three air branch pipes are provided, and the air outlets at the connection between each of the air branch pipes and the inner wall (11) of the decarbonization kiln are evenly distributed along the cross section of the inner wall (11) of the decarbonization kiln.

4. The internal combustion decarbonization rotary kiln air supply system according to claim 3 is characterized by: The air outlet of each of the air branch pipes is provided with an air outlet baffle (9) which is arranged inside the inner wall (11) of the decarbonization kiln and prevents materials from entering the air branch pipe. The air outlet baffle (9) is fixedly connected to the inner wall (11) of the decarbonization kiln and is arranged along the length direction of the internal combustion decarbonization rotary kiln (1). The air outlet baffle (9) is provided with a plurality of air outlet holes (93) for air to enter the internal combustion decarbonization rotary kiln (1).

5. The internal combustion decarbonization rotary kiln air supply system according to claim 4 is characterized by: The air branch pipe is formed by connecting an external air pipe and an internal air pipe. The external air pipe is arranged outside the internal combustion decarbonization rotary kiln (1). The internal air pipe is arranged in the space between the inner wall (11) of the decarbonization kiln and the outer wall (12) of the decarbonization kiln. The electric switch valve is arranged on the external air pipe.

6. The internal combustion decarbonization rotary kiln air supply system according to claim 2 is characterized by: The switch system comprises a photoelectric switch which is arranged in one-to-one correspondence with the electric switch valve and is used to control the opening and closing of the electric switch valve. The photoelectric switch is installed on the air main pipe (2). A receiver (4) which is fixed in position and is used to receive the optical signal of the photoelectric switch is provided outside the internal combustion decarbonization rotary kiln (1).

7. The internal combustion decarbonization rotary kiln air supply system according to claim 1 is characterized by: The control system is a PLC control module (100).

8. The internal combustion decarbonization rotary kiln air supply system according to claim 1 is characterized by: The fan (3) is a variable frequency fan, and the control system is also signal-connected to an industrial wireless remote controller (10) for controlling the frequency of the fan (3).

Images