Carbon baking flue gas treatment device with waste heat recovery

Abstract

The application discloses a carbon baking flue gas treatment device with waste heat recovery, and relates to the technical field of flue gas treatment.The device comprises a cyclone dust collector and a flue capable of conveying flue gas into the cyclone dust collector, and further comprises a Venturi tube coaxially arranged with the air inlet of the cyclone dust collector and the flue and used for connecting the flue and the air inlet of the cyclone dust collector; a material pipe fixedly connected with the throat of the Venturi tube and used for continuously conveying coke powder into the Venturi tube so that the coke powder is uniformly mixed with the flue gas and fully absorbs bitumen and tar in the flue gas; and a storage box arranged above the material pipe and capable of conveying coke powder into the material pipe through a pipeline.The coke powder is added into the Venturi tube through the material pipe, the bitumen smoke and dry tar mist droplets in the flue gas are absorbed, the bitumen smoke and tar mist droplets are changed into solid particles that can be centrifugally separated, and the bitumen smoke and tar mist droplets are prevented from sticking to the wall in the cyclone dust collector.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, specifically to a carbon roasting flue gas treatment device with waste heat recovery. Background Technology

[0002] The flue gas temperature generated by carbon roasting can reach 300-1500℃, and the recovery of waste heat from high-temperature flue gas for use in production, daily life and other fields has important economic value.

[0003] Because carbon roasting flue gas contains a large amount of particulate matter, it is usually necessary to pre-treat the flue gas at the front end of the waste heat recovery system to prevent the particulate matter from clogging the waste heat recovery system. Currently, cyclone dust collectors are commonly used for flue gas pretreatment to remove particulate matter with a diameter greater than 10μm, with a removal efficiency of ≥88%. However, since the flue gas contains asphalt fumes and tar mist, these substances tend to stick to the walls, accumulate material, and coke after entering the cyclone dust collector, which can easily damage the smooth inner wall of the cyclone dust collector. This can lead to turbulent airflow entering the cyclone dust collector and affect its normal operation. Summary of the Invention

[0004] The purpose of this invention is to provide a carbon roasting flue gas treatment device with waste heat recovery to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a carbon roasting flue gas treatment device with waste heat recovery, comprising a cyclone dust collector and a flue capable of conveying flue gas into the cyclone dust collector, and further comprising: The venturi tube is arranged coaxially with the air inlet and flue of the cyclone dust collector and is used to connect the flue and the air inlet of the cyclone dust collector. The feed pipe is fixedly connected to the throat of the venturi tube and is used to continuously feed coke powder into the venturi tube, so that the coke powder is evenly mixed with the flue gas and fully adsorbs the asphalt and tar in the flue gas. The storage bin is located above the feed pipe and can transport coke powder into the feed pipe through the pipe.

[0006] As a further aspect of the present invention, the feed tube and the venturi tube are arranged at an angle, so that the coke powder can enter the venturi tube obliquely along the airflow direction.

[0007] As a further embodiment of the present invention, the angle between the axis of the feed tube and the axis of the venturi tube is 30°-45°.

[0008] As a further embodiment of the present invention, the feed tubes are provided in multiple forms and are evenly arranged along the circumference of the venturi tube throat.

[0009] As a further embodiment of the present invention, a pushing mechanism is provided on the side of the feed tube, and the pushing mechanism is configured to continuously and uniformly convey the coke powder in the feed tube into the Venturi tube.

[0010] As a further embodiment of the present invention, the feeding mechanism includes a fixed base, which is fixedly connected to the end of the feed tube away from the venturi tube; the fixed base is provided with two first channels, and the fixed base is also provided with two feed inlets respectively communicating with the two first channels, the feed inlets communicating with the pipe; the fixed base is provided with a second channel, the second channel being used to connect the feed tube and the two first channels; each of the first channels is slidably installed with a pusher block, the pusher block being used to push the coke powder in the first channel into the feed tube, and the length of the pusher block being greater than the diameter of the feed inlet; the fixed base is also provided with a driving unit, the driving unit being configured to cause at least one of the two pushers to move towards the side closer to the feed tube at any time, thereby realizing continuous pushing of coke powder into the feed tube.

[0011] As a further embodiment of the present invention, the driving unit includes two turntables, which are coaxially arranged and fixedly connected by a rotating shaft; each of the two turntables is hinged with a connecting rod, and the hinge point between the connecting rod and the turntable is located at a non-center position on the turntable; the ends of the two connecting rods away from the turntables are respectively hinged to two push blocks; the rotating shaft is driven by a motor for driving its rotation.

[0012] As a further embodiment of the present invention, the second channel is configured as an arc shape.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a venturi tube and a feed pipe located at the throat of the venturi tube. As flue gas flows through the throat, it draws coke powder from the feed pipe into the venturi tube, mixing it with the flue gas. The high-speed flue gas flow instantly disperses the coke powder, preventing clumping and agglomeration. As the flue gas mixed with coke powder enters the diffuser section of the venturi tube, the airflow decelerates, generating strong turbulence and backflow, resulting in a more uniform mixture of coke powder and flue gas. The coke powder adsorbs asphalt fumes and dried tar droplets from the flue gas, transforming them into solid particles that can be centrifugally separated. This prevents asphalt fumes and tar droplets from adhering to the walls of the cyclone dust collector, avoiding turbulence in the flue gas flow. This allows for better separation of particulate matter in the flue gas, ensuring that the waste heat recovery system is not blocked by the flue gas. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the positional relationship between the venturi tube and the feed tube of the present invention; Figure 3This is a cross-sectional schematic diagram showing the connection relationship between the venturi tube and the feed tube of the present invention; Figure 4 This is a cross-sectional schematic diagram of the mounting base, first channel, second channel, push block, and drive unit structure of the present invention; Figure 5 This is a cross-sectional view of the connection between the mounting base and the pipeline of the present invention; Figure 6 This is a schematic diagram illustrating the working principle of the present invention.

[0015] The attached figures are labeled as follows: 1-Cyclone dust collector, 2-Flue, 3-Venturi tube, 4-Air inlet, 5-Material pipe, 6-Storage bin, 7-Pipe, 8-Fixed seat, 9-First channel, 10-Second channel, 11-Push block, 12-Turntable, 13-Rotating shaft, 14-Connecting rod, 15-Motor, 16-Feed inlet. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-6 This invention provides a technical solution: a carbon roasting flue gas treatment device with waste heat recovery, including a cyclone dust collector 1 and a flue 2 capable of conveying flue gas into the cyclone dust collector 1, and also including a venturi tube 3, a feed pipe 5, and a storage box 6; the venturi tube 3 is coaxially arranged with the air inlet 4 of the cyclone dust collector 1 and the flue 2, and is used to connect the flue 2 and the air inlet 4 of the cyclone dust collector 1; the feed pipe 5 is fixedly connected to the throat of the venturi tube 3, and is used to continuously convey coke powder into the venturi tube 3, so that the coke powder and the flue gas are uniformly mixed, and the asphalt and tar in the flue gas are fully adsorbed; the storage box 6 is located above the feed pipe 5, and can convey coke powder into the feed pipe 5 through a pipe 7.

[0018] refer to Figure 1The carbon roasting flue gas is introduced into the cyclone dust collector 1 through flue 2 and venturi tube 3; the coke powder stored in the storage bin 6 enters the feed pipe 5 through pipe 7; when the flue gas flows through the throat of venturi tube 3, the flow velocity reaches its maximum. According to Bernoulli's principle, the static pressure at the throat of venturi tube 3 is the lowest, which can directly form a negative pressure, which can draw the coke powder in feed pipe 5 into the venturi tube and mix it with the flue gas. Moreover, the high-speed flue gas flow can instantly disperse the coke powder, avoiding clumping and agglomeration. The flue gas mixed with coke powder enters the venturi tube. After the gradual expansion section, the airflow decelerates while generating strong turbulence and backflow, which allows the coke powder to mix more evenly with the flue gas. The coke powder can adsorb asphalt fumes and dried tar droplets in the flue gas, turning them into solid particles that can be separated by centrifugation. This prevents asphalt fumes and tar droplets from sticking to the inner wall of the cyclone dust collector 1, avoiding turbulence in the flue gas flow within the cyclone dust collector. Particulate matter in the flue gas can be better separated, providing a guarantee to avoid subsequent flue gas clogging of the waste heat recovery system.

[0019] Specifically, such as Figure 2 , Figure 3 and Figure 6 As shown, Figure 6 In the diagram, v1 and v2 represent the flow directions of flue gas and coke powder, respectively. The feed pipe 5 and the venturi tube 3 are arranged at an angle, allowing the coke powder to enter the venturi tube 3 obliquely along the airflow direction. This allows the coke powder to be drawn into the tube obliquely along the airflow direction by the negative pressure airflow inside the venturi tube 3, preventing the coke powder from accumulating and clogging at the interface between the feed pipe 5 and the venturi tube 3. At the same time, the coke powder is instantly dispersed by the high-speed airflow, improving the uniformity of mixing with the flue gas.

[0020] Specifically, such as Figure 6 As shown, the angle α between the axis of the feed tube 5 and the axis of the venturi tube 3 is 30°-45°. This tilt angle allows the coke powder to enter the tube obliquely in the direction of airflow, avoiding dust rebound and deposition caused by the feed tube outlet being perpendicular to the airflow direction. At the same time, it is beneficial for the coke powder to be instantly dispersed by the high-speed airflow, improving the uniformity of mixing with the flue gas.

[0021] Specifically, such as Figure 2 As shown, multiple feed pipes 5 are provided and are evenly arranged around the circumference of the throat of the Venturi tube 3. Considering that in order to adapt to the large flow of flue gas, the inlet 4 of the flue 2 and the cyclone dust collector 1 will be set with a large diameter, and the diameter of the Venturi tube 3 will also be correspondingly large. This means that if only a single point of coke powder is set, it is easy for the powder to flow off course and accumulate on the side near the point of addition. Multiple feed pipes 5 are evenly arranged around the throat of the Venturi tube 3 to further improve the uniformity of the mixing of coke powder and flue gas. The number of feed pipes 5 can be 2-4, and in this embodiment, there are 3.

[0022] Specifically, such as Figures 1-4As shown, a pushing mechanism is provided on the side of the feed pipe 5. The pushing mechanism is configured to continuously and uniformly convey the coke powder in the feed pipe 5 to the venturi tube 3. Considering that the flue 2, the venturi tube 3 and the air inlet of the cyclone dust collector 1 are arranged coaxially, the flue gas flow can enter the cyclone dust collector 1 more stably. However, it also means that the coke powder in the feed pipes other than the top feed pipe 5 is difficult to continuously fill the feed pipes by gravity. Therefore, a pushing mechanism is provided on the side of the feed pipe 5 so that the feed pipe 5 can be continuously filled with coke powder. When the flue gas flows through the throat of the venturi tube 3, it can stably draw the coke powder into the venturi tube 3.

[0023] Specifically, such as Figure 4 and Figure 5 As shown, the feeding mechanism includes a fixed base 8, which is fixedly connected to the end of the feed tube 5 away from the venturi tube 3. The fixed base 8 has two first channels 9 and two feed inlets 16 connected to the two first channels 9 respectively, which are connected to the pipe 7. The fixed base 8 also has a second channel 10, which connects the feed tube 5 to the two first channels 9. Push blocks 11 are slidably installed in each of the first channels 9, and the push blocks 11 are used to push the coke powder in the first channel 9 into the feed tube 5, with a length greater than the diameter of the feed inlets 16. The fixed base 8 also has a driving unit configured to ensure that at least one of the push blocks 11 moves towards the side closer to the feed tube 5 at any given time, thereby continuously pushing coke powder into the feed tube 5. (Reference) Figure 4 In the diagram, b and c represent two pushers 11. When the drive unit drives c to move closer to the second channel 10, b simultaneously moves away from the second channel 10. c can push the coke powder in the first channel 9 into the feed tube 5 through the second channel 10. When c moves to its furthest position, it immediately turns and moves away from the second channel 10. At this time, b simultaneously turns and moves closer to the second channel 10. At this time, b pushes the coke powder in the first channel 9 into the feed tube 5 through the second channel 10, so that the coke powder can continuously and uninterruptedly enter the feed tube 5. The negative pressure inside the Venturi tube 3 can continuously and uninterruptedly draw the coke powder in the feed pipe 5 into the Venturi tube 3, which not only ensures the stability and efficiency of the asphalt fume adsorption process and avoids pipe wall blockage, flow field disturbance and system pressure fluctuation caused by interruption of material supply, but also improves the mixing uniformity of coke powder and flue gas, ensuring the continuous and stable operation of subsequent dust removal and the entire flue gas treatment system. It should be noted that when the pusher block 11 moves away from the second channel 10, the coke powder in the storage box 6 enters the first channel 9 through the pipe 7 and the feed inlet 16, which provides a guarantee for the pusher block 11 to push the coke powder into the feed pipe 5.

[0024] Specifically, such as Figure 4As shown, the drive unit includes two turntables 12, which are coaxially arranged and fixedly connected by a shaft 13. Each turntable 12 is hinged with a connecting rod 14, and the hinge point between the connecting rod 14 and the turntable 12 is located at a non-center position on the turntable 12. The ends of the two connecting rods 14 away from the turntable 12 are respectively hinged to two push blocks 11. The shaft 13 is connected to a motor 15 for driving its rotation. The motor 15 can drive the two turntables 12 to rotate synchronously through the shaft 13. The turntables 12, connecting rods 14 and push blocks 11 can be combined into a crank-connecting rod mechanism. The connecting rods 14 convert the rotation of the turntables 12 into the reciprocating movement of the push blocks 11. By adjusting the hinge position between the two connecting rods 14 and the turntables 12, at least one of the two push blocks 11 can be moved towards the side closer to the feed tube 5 at any time.

[0025] Specifically, such as Figure 4 As shown, the second channel 10 is set in an arc shape. The arc-shaped second channel 10 has no dead corners, which can make the coke powder enter the feed tube 5 more smoothly.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A carbon roasting flue gas treatment device with waste heat recovery, comprising a cyclone dust collector (1) and a flue (2) capable of conveying flue gas into the cyclone dust collector (1), characterized in that: Also includes: The Venturi tube (3) is arranged coaxially with the air inlet (4) of the cyclone dust collector (1) and the flue (2), and is used to connect the flue (2) with the air inlet (4) of the cyclone dust collector (1). The feed pipe (5) is fixedly connected to the throat of the venturi tube (3) and is used to continuously convey coke powder into the venturi tube (3) so that the coke powder and flue gas are evenly mixed and fully adsorbed by the asphalt and tar in the flue gas. The storage box (6) is located above the material pipe (5) and can transport coke powder into the material pipe (5) through the pipe (7); The feed tube (5) is provided with a pushing mechanism on its side. The pushing mechanism is configured to continuously and uniformly transport the coke powder in the feed tube (5) into the venturi tube (3). The feeding mechanism includes a fixed base (8), which is fixedly connected to the end of the feed tube (5) away from the venturi tube (3); the fixed base (8) is provided with two first channels (9), and the fixed base (8) is also provided with two feed inlets (16) respectively connected to the two first channels (9), and the feed inlets (16) are connected to the pipe (7); the fixed base (8) is provided with a second channel (10), which is used to connect the feed tube (5) and the two first channels (9); each of the first channels (9) is slidably installed with a pusher (11), which is used to push the coke powder in the first channel (9) into the feed tube (5), and the length is greater than the diameter of the feed inlet (16); the fixed base (8) is also provided with a driving unit, which is configured to make at least one of the two pushers (11) move towards the side closer to the feed tube (5) at any time, so as to continuously push the coke powder into the feed tube (5).

2. The carbon roasting flue gas treatment device with waste heat recovery according to claim 1, characterized in that: The feed pipe (5) and the venturi tube (3) are arranged at an angle so that the coke powder can enter the venturi tube (3) at an angle along the airflow direction.

3. A carbon roasting flue gas treatment device with waste heat recovery according to claim 2, characterized in that: The angle between the axis of the feed tube (5) and the axis of the venturi tube (3) is 30°-45°.

4. A carbon roasting flue gas treatment device with waste heat recovery according to claim 1, characterized in that: The feed tube (5) is provided in multiple parts and is evenly arranged around the throat of the venturi tube (3).

5. A carbon roasting flue gas treatment device with waste heat recovery according to claim 1, characterized in that: The drive unit includes two turntables (12), which are coaxially arranged and fixedly connected by a shaft (13); each of the two turntables (12) is hinged with a connecting rod (14), and the hinge point between the connecting rod (14) and the turntable (12) is located at a non-center position on the turntable (12); the ends of the two connecting rods (14) away from the turntable (12) are respectively hinged to two push blocks (11); the shaft (13) is driven by a motor (15) for driving its rotation.

6. A carbon roasting flue gas treatment device with waste heat recovery according to claim 1, characterized in that: The second channel (10) is set to an arc shape.

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