A rotary kiln tail gas recovery device

Abstract

The utility model provides a kind of rotary kiln tail gas recovery device, including several filter components and negative pressure pipeline, including filter bin, dust collection bin, filter cartridge assembly, backflush mechanism and air floatation mechanism, the outside of filter bin and top are equipped with air inlet and exhaust port respectively, the filter cartridge assembly is built-in the inside of filter bin, the backflush mechanism is installed in filter bin inner top wall, for the air injection to filter cartridge assembly inside, the dust collection bin is set in the bottom of filter bin. The utility model is through the filter cartridge assembly of filter component intercepts dust, under the backflush of backflush mechanism, dust is caused to separate from filter cartridge assembly, and is collected in dust collection bin, dust is avoided to be gathered in dust collection bin by air floatation mechanism, and cooperation negative pressure pipeline suction can smoothly export dust from filter component, and is transported to raw material;The on-off of valve can switch passageway between multiple filter components, realize uninterrupted tail gas treatment.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas recovery technology, specifically to a rotary kiln exhaust gas recovery device. Background Technology

[0002] A rotary kiln (rotary calcining kiln) is a large, cylindrical, high-temperature calcining device that uses tilting and rotation to continuously tumble materials and complete physicochemical reactions. It is widely used in building materials, metallurgy, chemical industry, and environmental protection. The exhaust gas from rotary kiln calcination is characterized by high temperatures, and the waste heat can be recovered and utilized. For example, Chinese Patent 202120293546.6 discloses a rotary kiln exhaust gas recovery device, comprising: a rotary kiln body, a first air inlet, a second air inlet, a first air outlet, a second air outlet, a hot water collection tank, and a first blower; the outlets of the first and second air inlets are connected to the inlet of the rotary kiln body; the inlets of the first and second air outlets are connected to the outlet of the rotary kiln body; the inlet of the first air inlet is connected to the blower; the inlet of the second air inlet is connected to the outlet of the second air outlet; and the outlet of the second air outlet is connected to the hot water collection tank.

[0003] In lithium battery materials or metal smelting, high-temperature dust exhaust gases may contain precious metals such as lithium, nickel, and cobalt. Currently, traditional exhaust gas filtration structures can filter out dust in the exhaust gas. However, the purpose of filtration is mainly to purify the exhaust gas to meet emission standards. Structures that actively remove dust from the filtration structure for reuse are still relatively rare. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a rotary kiln tail gas recovery device to solve the technical problem that there are currently few existing technologies that actively remove dust from the filter structure for reuse.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This utility model provides a rotary kiln tail gas recovery device, comprising: Several filter components, including a filter chamber, a dust collection chamber, a filter cartridge assembly, a backflushing mechanism, and an air flotation mechanism. The filter chamber has an air inlet and an exhaust outlet on its outer side and top, respectively. The filter cartridge assembly is built into the inner side of the filter chamber. The backflushing mechanism is installed on the inner top wall of the filter chamber for spraying air towards the inner side of the filter cartridge assembly. The dust collection chamber is located at the bottom of the filter chamber. The air flotation mechanism is installed on the inner bottom wall of the dust collection chamber for dispersing dust by blowing air onto the inner bottom wall of the dust collection chamber. The negative pressure pipeline is connected to the bottom of the dust collection bin through valves and is used to suck up and transport dust.

[0006] In some embodiments, the filter cartridge assembly includes a rotary drive and a metal filter cartridge. The rotary drive is mounted on the filter chamber, and its movable end is detachably connected to the metal filter cartridge, driving the metal filter cartridge to rotate inside the filter chamber.

[0007] In some embodiments, an end-face sealing assembly is provided between the metal filter cartridge and the filter chamber for rotary sealing.

[0008] In some embodiments, the filter chamber includes a chamber body and a chamber cover. The chamber cover is detachably connected to the top of the chamber body. The backflushing mechanism is installed on the chamber cover. The rotary drive component is installed on the chamber cover. The exhaust port is located on the outside of the chamber body and on the top of the chamber cover. The metal filter cartridge is inserted into the inside of the chamber body. The end face sealing assembly is located between the chamber body and the metal filter cartridge.

[0009] In some embodiments, the backflush mechanism includes a solenoid valve and an annular tube. The annular tube has uniformly spaced air jet holes at its top. The solenoid valve is connected to the annular tube and is used to connect to an air source and control the flow of the backflush airflow.

[0010] In some embodiments, the end-face sealing assembly includes an elastic component, a rotating ring, a first stationary ring, and a second stationary ring. The elastic component is mounted on the chamber cover and connected to the first stationary ring. The second stationary ring is fixed to the inner side of the chamber body. The rotating ring is fixed to the outer side of the top end of the metal filter cartridge. The two sides of the rotating ring abut against the first stationary ring and the second stationary ring, respectively. The elastic component is used to elastically push the first stationary ring towards the rotating ring.

[0011] In some embodiments, the elastic component includes a base plate, a pressure plate, and springs. The base plate has a plurality of grooves, and the springs are embedded in the grooves one by one. The end of the spring away from the groove is connected to the pressure plate, and the pressure plate is connected to the first stationary ring.

[0012] In some embodiments, the dust collection bin is conical in shape.

[0013] In some embodiments, the air flotation mechanism includes an annular air distribution pipe and an air valve. The annular air distribution pipe has a plurality of air flotation microholes, and the air valve is installed at one end of the annular air distribution pipe for connecting an air source and controlling the on / off state of the air flotation.

[0014] In some embodiments, the air inlet is provided with a control valve for controlling the on / off state of flue gas injection.

[0015] Compared with the prior art, the rotary kiln tail gas recovery device provided by this utility model intercepts dust through the filter cartridge assembly of the filter component. The backflushing mechanism causes the dust to detach from the filter cartridge assembly and be collected in the dust collection bin. In the dust collection bin, the air flotation mechanism prevents the dust from agglomerating. With the help of negative pressure pipeline suction, the dust can be smoothly discharged from the filter component and transported to the raw material. The passage can be switched between multiple filter components by opening and closing the valve to achieve uninterrupted tail gas treatment. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the rotary kiln tail gas recovery device provided in this embodiment of the utility model; Figure 2 This is a three-dimensional schematic diagram of a single filter component of the rotary kiln tail gas recovery device provided in this embodiment of the utility model; Figure 3 This is a three-dimensional exploded view of a single filter component of the rotary kiln tail gas recovery device provided in this embodiment of the utility model; Figure 4 This is a cross-sectional view of a single filter component of the rotary kiln tail gas recovery device provided in this embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Filter assembly; 101. Air inlet; 102. Exhaust outlet; 103. Control valve; 11. Filter chamber; 111. Chamber body; 112. Chamber cover; 12. Dust collection chamber; 13. Filter cartridge assembly; 131. Rotary drive component; 132. Metal filter cartridge; 14. Backflushing mechanism; 141. Solenoid valve; 142. Annular pipe; 15. Air flotation mechanism; 151. Annular air distribution pipe; 152. Air valve; 16. End face sealing assembly; 161. Elastic component; 161a. Base plate; 161b. Pressure plate; 161c. Spring; 162. Moving ring; 163. First stationary ring; 164. Second stationary ring; 2. Negative pressure pipeline; 201. Valve; 3. Exhaust pipe; 4. Exhaust pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] To address the current lack of technologies for actively removing and reusing dust from filter structures, this invention provides a rotary kiln exhaust gas recovery device. This device intercepts dust in the filter cartridge assembly, and the backflushing mechanism causes the dust to detach from the filter cartridge assembly and collect in a dust collection bin. Within the dust collection bin, an air flotation mechanism prevents dust agglomeration, and combined with negative pressure pipe suction, the dust can be smoothly extracted from the filter assembly and transported to the raw material area.

[0020] It should be noted that the rotary kiln tail gas recovery device described in this utility model is used for, but not limited to, rotary kiln tail gas recovery. For ease of explanation, this utility model only uses the application of the rotary kiln tail gas recovery device in rotary kiln tail gas recovery as an example for explanation. The principle of the rotary kiln tail gas recovery device applied to other types of equipment is essentially the same as the principle applied to rotary kiln tail gas recovery, and will not be described in detail here.

[0021] Please see Figure 1-4 This utility model provides a rotary kiln exhaust gas recovery device, which includes several filter components 1 and a negative pressure pipeline 2. Each filter component 1 includes a filter chamber 11, a dust collection chamber 12, a filter cartridge assembly 13, a backflushing mechanism 14, and an air flotation mechanism 15. The filter chamber 11 has an air inlet 101 and an exhaust outlet 102 on its outer side and top, respectively. The air inlet 101 is equipped with a control valve 103 for controlling the flow of flue gas. The air inlet 101 allows exhaust gas to enter the filter chamber 11, and the exhaust outlet 102 allows the gas to be discharged after being filtered by the filter cartridge assembly 13. Both the air inlet 101 and the exhaust outlet 102 are equipped with valves to control the flow of exhaust gas. The filter cartridge assembly 13 is built into the inner side of the filter chamber 11, dividing the interior of the filter chamber 11 into a filtration area connected to the dust collection chamber 12 and a clean air area connected to the exhaust outlet 102. The backflushing mechanism 14 is also located within the clean air area. The backflushing mechanism 14 is installed on the inner top wall of the filter chamber 11 and is used to spray air towards the inside of the filter cartridge assembly 13 for backflushing dust removal, spraying the dust accumulated on the filter cartridge assembly 13 off the filter cartridge assembly 13. The dust collection chamber 12 is located at the bottom of the filter chamber 11, and the air flotation mechanism 15 is installed on the inner bottom wall of the dust collection chamber 12 to disperse dust by blowing air on the inner bottom wall of the dust collection chamber 12 to prevent dust from agglomerating. The negative pressure pipe 2 is connected to the bottom of the dust collection chamber 12 one by one through valve 201 for sucking and transporting dust.

[0022] In this embodiment, during filtration and sedimentation, the air inlet 101 and the exhaust outlet 102 are opened to continuously introduce fresh exhaust gas, while the valves 201 of the air flotation mechanism 15 and the negative pressure pipeline 2 are closed. During air flotation fluidization, the dust is fluidized, and the air inlet 101, the exhaust outlet 102, and the valves 201 of the negative pressure pipeline 2 are all closed. The air flotation mechanism 15 is opened to introduce inert gas, which agitates the dust and disperses it to form a fluid block that can be dispersed. After air flotation fluidization, the air flotation mechanism 15 is closed, and the dust can be sucked and transported without clogging. At this time, the air inlet 101 is closed, the exhaust outlet 102 is opened, and the valve 201 of the negative pressure pipeline 2 is opened for negative pressure suction.

[0023] In this embodiment, the number of filter components 1 is at least two, which can form uninterrupted exhaust gas treatment. In one embodiment, please refer to Figure 3 and Figure 4 To achieve uniform dust distribution and reduce adhesion, the filter cartridge assembly 13 includes a rotary drive 131 and a metal filter cartridge 132. The rotary drive is mounted on the filter chamber 11, and its movable end is detachably connected to the metal filter cartridge 132, driving the metal filter cartridge 132 to rotate inside the filter chamber 11. The rotation of the metal filter cartridge 132 generates centrifugal force, preventing fine dust from adhering tightly. Furthermore, the rotation enhances the pulse backflushing effect, making it easier for dust to fall off.

[0024] Understandably, the rotary drive component 131 can be a variable frequency speed control motor. The metal filter cartridge 132 can be connected to the output shaft of the variable frequency speed control motor via a plug-in structure. Specifically, the top of the metal filter cartridge 132 has a hollow frame, on which there are protrusions for plugging into the output shaft of the variable frequency speed control motor, and a transmission key is provided to transmit rotational torque, driving the metal filter cartridge 132 to rotate. Furthermore, the plug-in structure does not restrict the axial movement of the metal filter cartridge 132; the metal filter cartridge 132 can move axially, matching the axial compensation of the end face seal.

[0025] In one embodiment, please refer to Figure 3 and Figure 4 In order to provide a good sealing effect during the rotation of the metal filter cartridge 132 and prevent crossflow between the filtration area and the purification area, an end face sealing assembly 16 is provided between the metal filter cartridge 132 and the filter chamber 11 for rotational sealing.

[0026] In this embodiment, the end-face sealing assembly 16 includes an elastic component 161, a moving ring 162, a first stationary ring 163, and a second stationary ring 164. The elastic component 161 is mounted on the chamber cover 112 and connected to the first stationary ring 163. The second stationary ring 164 is fixed to the inner side of the chamber body 111. The moving ring 162 is fixed to the outer side of the top end of the metal filter cartridge 132. The two sides of the moving ring 162 abut against the first stationary ring 163 and the second stationary ring 164, respectively. The elastic component 161 is used to elastically push the first stationary ring 163 towards the moving ring 162. Through the elastic pushing of the elastic component 161, the end faces of the moving ring 162 are pressed together with the first stationary ring 163 and the second stationary ring 164 to form a seal.

[0027] Understandably, the moving ring 162, the first stationary ring 163, and the second stationary ring 164 can be made of materials with self-lubricating properties, such as silicon carbide.

[0028] It should be noted that the end face sealing assembly 16 can adopt other structures with shaft seals, which will not be elaborated on here.

[0029] In one embodiment, please refer to Figure 2 and Figure 3 To facilitate the assembly, disassembly, and internal maintenance of the metal filter cartridge 132, the filter chamber 11 includes a chamber body 111 and a chamber cover 112. The chamber cover 112 is detachably connected to the top of the chamber body 111. The backflushing mechanism 14 is mounted on the chamber cover 112, and the rotary drive 131 is mounted on the chamber cover 112. When disassembling the chamber cover 112, the rotary drive 131, the backflushing mechanism 14, and the metal filter cartridge 132 can be separated from the chamber body 111 together. Furthermore, in the end-face sealing assembly 16, the elastic component 161 and the first stationary ring 163 separate from the chamber body 111 along with the chamber cover 112, and the rotating ring 162 separates from the chamber body 111 along with the metal filter cartridge 132. The exhaust port 102 is located on the outside of the chamber body 111 and on the top of the chamber cover 112. The metal filter cartridge 132 is inserted into the inside of the chamber body 111. The end face sealing assembly 16 is located between the chamber body 111 and the metal filter cartridge 132. Specifically, the second stationary ring 164 is still fixed on the chamber body 111.

[0030] In one embodiment, please refer to Figure 3 and Figure 4In order to uniformly backflush the inside of the metal filter cartridge 132, the backflush mechanism 14 includes a solenoid valve 141 and an annular pipe 142. The top of the annular pipe 142 is uniformly provided with air jet holes. The solenoid valve 141 is connected to the annular pipe 142 and is used to connect to the air source and control the flow of backflush air. By opening the solenoid valve 141, compressed gas is introduced into the annular pipe 142 and sprayed evenly through the air jet holes on the annular pipe 142, backflushing from the inside to the outside of the metal filter cartridge 132 and washing away the dust on the outside of the metal filter cartridge 132.

[0031] Understandably, the gas source can be a compressed gas cylinder filled with inert compressed gas.

[0032] In one embodiment, please refer to Figure 4 To provide elastic compensation and compensate for the wear gap between the moving ring and the fixed ring, the elastic component 161 includes a base plate 161a, a pressure plate 161b, and a spring 161c. The base plate 161a has several grooves, and the springs 161c are embedded in the grooves one by one. The end of the spring 161c away from the groove is connected to the pressure plate 161b. The spring 161c pushes the pressure plate 161b and the first stationary ring 163 downward. When wear occurs, it can still elastically push, so that the first stationary ring 163, the moving ring 162, and the second stationary ring 164 fit tightly.

[0033] In one embodiment, please refer to Figure 4 The dust collection chamber 12 is cone-shaped, which facilitates the downward movement of dust.

[0034] Furthermore, the air flotation mechanism 15 includes an annular air distribution pipe 151 and an air valve 152. The annular air distribution pipe 151 has several air flotation micropores. The air valve 152 is installed at one end of the annular air distribution pipe 151 and is used to connect to an air source and control the air flotation. The air valve 152 is connected to an inert gas source. The gas can pass through the micropores, but dust particles >10μm are blocked above the breathable layer, similar to wearing a mask that allows breathing but blocks dust. The micropores are only 0.3mm in size, allowing normal airflow.

[0035] Understandably, the air flotation mechanism 15 can switch between continuous low pressure and high-pressure bursts: continuous low pressure, 0.05MPa; pulsed clearing high-pressure bursts, 0.6MPa. The air flotation mechanism 15 can generate air flotation, but it is not prone to clogging. First, it uses physical isolation, with 0.3mm micropores to block dust from entering, and it is combined with the active clearing function, high-pressure pulse automatic backflushing, and a Teflon coating can be applied to the inner wall of the dust collection chamber 12 to improve smoothness.

[0036] To better understand this utility model, the following is combined with... Figures 1 to 4The technical solution of this utility model is described in detail as follows: First, filtration and sedimentation are performed by opening the air inlet 101 and the exhaust outlet 102 to continuously introduce fresh exhaust gas, while the valves 201 of the air flotation mechanism 15 and the negative pressure pipeline 2 are closed; then, any filter component 1 is selected for backflushing, with the air inlet 101, exhaust outlet 102, air flotation mechanism 15, and negative pressure pipeline 2 all closed; after backflushing, air flotation fluidization is performed to promote dust fluidization, and the air inlet 101 and exhaust outlet 102 on the filter component 1 are closed. Both valve 201 of 02 and negative pressure pipeline 2 are closed, and air flotation mechanism 15 is opened to introduce inert gas, agitate the dust to disperse it, and form a fluidized state, which can disperse clumps; after air flotation fluidization, air flotation mechanism 15 is closed, and dust can be sucked and transported without clogging. At this time, air inlet 101 is closed, exhaust outlet 102 is opened, and valve 201 of negative pressure pipeline 2 of filter assembly 1 is opened to perform negative pressure suction; when there are multiple filter assemblies 1, the dust can be transported sequentially.

[0037] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A rotary kiln tail gas recovery device, characterized in that, include: Several filter components, including a filter chamber, a dust collection chamber, a filter cartridge assembly, a backflushing mechanism, and an air flotation mechanism. The filter chamber is provided with an air inlet and an air outlet on its outer side and top, respectively. The filter cartridge assembly is built into the inner side of the filter chamber. The backflushing mechanism is installed on the inner top wall of the filter chamber for spraying air towards the inner side of the filter cartridge assembly. The dust collection chamber is located at the bottom of the filter chamber. The air flotation mechanism is installed on the inner bottom wall of the dust collection chamber for blowing air to disperse dust on the inner bottom wall of the dust collection chamber. as well as The negative pressure pipeline is connected to the bottom of the dust collection bin through valves and is used to suck up and transport dust.

2. The rotary kiln tail gas recovery device according to claim 1, characterized in that, The filter cartridge assembly includes a rotary drive and a metal filter cartridge. The rotary drive is mounted on the filter chamber, and its movable end is detachably connected to the metal filter cartridge, driving the metal filter cartridge to rotate inside the filter chamber.

3. The rotary kiln tail gas recovery device according to claim 2, characterized in that, An end-face sealing assembly is provided between the metal filter cartridge and the filter chamber for rotary sealing.

4. The rotary kiln tail gas recovery device according to claim 3, characterized in that, The filter chamber includes a chamber body and a chamber cover. The chamber cover is detachably connected to the top of the chamber body. The backflushing mechanism is installed on the chamber cover. The rotary drive component is installed on the chamber cover. The exhaust port is located on the outside of the chamber body and on the top of the chamber cover. The metal filter cartridge is inserted into the inside of the chamber body. The end face sealing assembly is located between the chamber body and the metal filter cartridge.

5. The rotary kiln tail gas recovery device according to claim 4, characterized in that, The backflow mechanism includes a solenoid valve and an annular tube. The top of the annular tube is evenly provided with air jet holes. The solenoid valve is connected to the annular tube and is used to connect to the air source and control the flow of backflow.

6. The rotary kiln tail gas recovery device according to claim 4, characterized in that, The end-face sealing assembly includes an elastic component, a moving ring, a first stationary ring, and a second stationary ring. The elastic component is mounted on the chamber cover and connected to the first stationary ring. The second stationary ring is fixed to the inner side of the chamber body. The moving ring is fixed to the outer side of the top of the metal filter cartridge. The two sides of the moving ring abut against the first stationary ring and the second stationary ring, respectively. The elastic component is used to elastically push the first stationary ring towards the moving ring.

7. The rotary kiln tail gas recovery device according to claim 6, characterized in that, The elastic component includes a base plate, a pressure plate, and springs. The base plate has several grooves, and each spring is embedded in one of the grooves. The end of each spring away from the groove is connected to the pressure plate, and the pressure plate is connected to the first stationary ring.

8. The rotary kiln tail gas recovery device according to claim 1, characterized in that, The dust collection chamber is conical in shape.

9. The rotary kiln tail gas recovery device according to claim 1, characterized in that, The air flotation mechanism includes an annular air distribution pipe and an air valve. The annular air distribution pipe has several air flotation micro-holes. The air valve is installed at one end of the annular air distribution pipe and is used to connect to the air source and control the air flotation on and off.

10. The rotary kiln tail gas recovery device according to claim 1, characterized in that, The air inlet is equipped with a control valve for controlling the on / off of flue gas injection.

Images