Rotary kiln tail gas dust removal system and coal gangue ceramsite production line using the system

Abstract

The present invention relates to a rotary kiln tail gas dust removal system and a coal gangue ceramsite production line using the system; the rotary kiln tail gas dust removal system includes a bag filter and an adjustable smoke chamber arranged at the tail of the rotary kiln. The adjustable smoke chamber includes two or more juxtaposed smoke chambers. A smoke chamber communication port for flue gas to pass through is provided between adjacent smoke chambers. The adjustable smoke chamber further includes a smoke chamber valve plate rotatably arranged in the smoke chamber communication port for adjusting the opening degree of the smoke chamber communication port. Each smoke chamber is respectively connected to the main flue gas pipeline between the bag filter and the rotary kiln through a smoke chamber intermediate pipeline. The adjustable smoke chamber further includes a valve plate rotation control structure for controlling the rotation of the smoke chamber valve plate. During operation, according to the flue gas temperature measured by the temperature sensor, the rotation angle of the smoke chamber valve plate is controlled to change the volume of the adjustable smoke chamber, adjust the flue gas flow rate, and further control the flue gas temperature so that the flue gas temperature is within the working temperature range of the bag filter, avoiding bag sticking or bag burning.

Description

Technical Field

[0001] The present invention belongs to the field of dust removal, and particularly relates to a rotary kiln tail gas dust removal system and a coal gangue ceramsite production line using the system. Background Art

[0002] In existing coal gangue ceramsite production projects, the bag filters for backend tail gas treatment often experience bag clogging and bag burning, both of which can render the filter bags of the dust collector ineffective, requiring replacement of the bags, resulting in a huge loss cost. At the same time, it also greatly affects subsequent production and reduces efficiency.

[0003] In order to avoid bag clogging in the existing production process, external insulation of the dust collector is often used to avoid flue gas condensation caused by temperature difference. This method can only solve the condensation caused by the internal and external temperature difference to a certain extent and cannot fundamentally solve the problem. After resuming work after a long holiday shutdown, when high-temperature flue gas encounters normal-temperature filter bags, condensation will occur, and solid particles will adhere to the filter bags, resulting in bag clogging, increasing the flue gas resistance and affecting ventilation.

[0004] When the temperature of the kiln tail flue gas is too high, in order to avoid bag burning, cold air is usually blown in to cool the flue gas. However, the cooling range is limited. When the tail gas temperature is too high, the flue gas cannot be immediately cooled down, resulting in bag burning. Moreover, it is also easy to cause excessive oxygen content in the backend tail gas, affecting the backend tail gas treatment and detection, with great drawbacks. Summary of the Invention

[0005] The purpose of the present invention is to provide a rotary kiln tail gas dust removal system to solve the problems of frequent bag clogging and bag burning in the bag filter of the existing dust removal system; the purpose of the present invention is also to provide a coal gangue ceramsite production line using the system.

[0006] To achieve the above purpose, the rotary kiln tail gas dust removal system of the present invention adopts the following technical solutions: The rotary kiln tail gas dust removal system includes a bag filter and an adjustable smoke chamber arranged at the tail of the rotary kiln. The adjustable smoke chamber includes two or more smoke chambers arranged in parallel. There is a smoke chamber communication port for the flue gas to pass between adjacent smoke chambers. A smoke chamber valve plate rotatably arranged for adjusting the opening degree of the smoke chamber communication port is provided in the smoke chamber communication port. Each smoke chamber is respectively connected to the main flue gas pipeline between the bag filter and the rotary kiln through a smoke chamber intermediate pipeline. The adjustable smoke chamber further includes a valve plate rotation control structure for controlling the rotation angle of the smoke chamber valve plate.

[0007] Beneficial effects: During operation, according to the flue gas temperature measured by the temperature sensor, the rotation angle of the valve plate in the smoke chamber is controlled, the volume of the adjustable smoke chamber is changed, the flue gas flow rate is adjusted, and then the flue gas temperature is controlled (in this field, the flow rate of the flue gas is positively correlated with the temperature of the flue gas at the rear side of the pipeline). When the temperature of the kiln tail flue gas is relatively high (such as higher than 400 °C), the valve plate in the smoke chamber is rotated by a certain angle to increase the volume of the smoke chamber, reduce the flue gas flow rate, and lower the temperature of the flue gas reaching the bag filter. When the temperature of the kiln tail flue gas is relatively low (such as lower than 150 °C), the valve plate in the smoke chamber is rotated by a certain angle to reduce the volume of the smoke chamber, reduce the flue gas flow rate, and quickly discharge the humid and low-temperature flue gas.

[0008] Further, above the corresponding smoke chamber communication ports between adjacent smoke chambers, there are dust baffle plates, and at the bottom of each smoke chamber, there is a smoke chamber ash hopper for discharging the dust in the smoke chamber. The flue gas in each smoke chamber is dust-removed and then discharged through the smoke chamber ash hopper.

[0009] Further, on the intermediate pipelines of each smoke chamber, there is a butterfly valve for the intermediate pipeline of the smoke chamber respectively.

[0010] Further, the adjustable smoke chamber further includes a kiln tail flue gas temperature sensor for detecting the temperature of the kiln tail flue gas of the rotary kiln. The kiln tail flue gas temperature sensor is used for signal connection with the control system of the coal gangue ceramsite production line, and the valve plate rotation control structure is control-connected with the control system of the coal gangue ceramsite production line.

[0011] Further, the smoke chambers are arranged side by side left and right. On the front side walls of each smoke chamber, there are channel openings for connecting the intermediate channels of the smoke chamber. The valve plate rotation control structure includes a valve plate rotating shaft with a rotation axis extending in the front-rear direction. The valve plate rotating shaft is fixedly connected with the valve plate in the smoke chamber. The valve plate rotation control structure further includes a valve plate rotating shaft driving device for driving the valve plate rotating shaft to rotate by a certain angle. One end of the valve plate rotating shaft extends out of the adjustable smoke chamber and is connected with the valve plate rotating shaft driving device.

[0012] Further, the adjustable smoke chamber further includes a smoke chamber frame for supporting each of the said smoke chambers. The valve plate rotation control structure further includes fixed sleeves arranged on the smoke chamber frame for inserting the valve plate rotating shaft. There are two fixed sleeves, and the two fixed sleeves are arranged at intervals in the front-rear direction. The two ends of the valve plate rotating shaft are respectively inserted into the corresponding fixed sleeves. One end of the valve plate rotating shaft extends out of the corresponding fixed sleeve and is connected with a rocker. On the side wall of one of the fixed sleeves, there is a set screw for fixing the position of the valve plate rotating shaft after the valve plate in the smoke chamber rotates in place.

[0013] Further, a pre-dust removal device is provided on the main flue gas pipeline between the bag filter and the rotary kiln and / or a post-dust removal device is provided on the main flue gas pipeline between the bag filter and the chimney. The rotary kiln tail gas dust removal system further includes a protective branch flue gas pipeline arranged in parallel with the bag filter. The front end of the protective branch flue gas pipeline is connected to the main flue gas pipeline between the bag filter and the pre-dust removal device, and the rear end of the protective branch flue gas pipeline is connected to the main flue gas pipeline between the bag filter and the post-dust removal device. A main pipeline electric valve is provided on the main flue gas pipeline between the front end of the protective branch flue gas pipeline and the bag filter, a branch pipeline electric valve is provided on the protective branch flue gas pipeline, a flue gas temperature sensor is provided on the main flue gas pipeline between the bag filter and the rotary kiln, and the flue gas temperature sensor is used for signal connection with the control system of the coal gangue ceramsite production line. The main pipeline electric valve and the branch pipeline electric valve are respectively used for control connection with the control system of the coal gangue ceramsite production line.

[0014] When the flue gas temperature sensor detects that the flue gas temperature exceeds the set value (such as 250 °C) or is lower than the set value (such as 120 °C), the control system of the coal gangue ceramsite production line controls the main pipeline electric valve to close and the branch pipeline electric valve to open, so that the high-temperature flue gas does not pass through the bag filter, avoiding the situation of bag burning or bag clogging; the flue gas is treated by the pre-dust removal device and / or the post-dust removal device. Compared with the prior art, the problem that the bag filter often has bag clogging and bag burning is solved.

[0015] Further, the pre-dust removal device includes a cyclone dust collector for treating the flue gas before entering the bag filter.

[0016] Further, the post-dust removal device includes a scrubber for treating the flue gas after being treated by the bag filter.

[0017] The coal gangue ceramsite production line of the present invention adopts the following technical solutions: The coal gangue ceramsite production line includes a rotary kiln and a dust removal system for treating the flue gas discharged from the tail of the rotary kiln. The dust removal system includes a bag filter and an adjustable smoke chamber arranged at the tail of the rotary kiln. The adjustable smoke chamber includes two or more juxtaposed smoke chambers. A smoke chamber communication port for the flue gas to pass through is provided between adjacent smoke chambers. A smoke chamber valve plate rotatably arranged for adjusting the opening degree of the smoke chamber communication port is provided in the smoke chamber communication port. Each smoke chamber is respectively connected to the main flue gas pipeline between the bag filter and the rotary kiln through a smoke chamber intermediate pipeline. The adjustable smoke chamber further includes a valve plate rotation control structure for controlling the rotation angle of the smoke chamber valve plate.

[0018] Further, a dust baffle is provided above the corresponding smoke chamber communication port between adjacent smoke chambers, and a smoke chamber ash hopper for discharging the dust in the smoke chamber is respectively provided at the bottom of each smoke chamber.

[0019] Further, a butterfly valve for the intermediate pipe of each smoke chamber is respectively provided on the intermediate pipe of each smoke chamber.

[0020] Further, the adjustable smoke chamber further includes a tail gas temperature sensor for detecting the temperature of the tail gas of the rotary kiln. The tail gas temperature sensor is signal-connected to the control system of the coal gangue ceramsite production line, and the valve plate rotation control structure is control-connected to the control system of the coal gangue ceramsite production line.

[0021] Further, the smoke chambers are arranged side by side left and right. A channel opening for connecting the intermediate channel of the smoke chamber is provided on the front side wall of each smoke chamber. The valve plate rotation control structure includes a valve plate rotating shaft with a rotation axis extending in the front-rear direction. The valve plate rotating shaft is fixedly connected to the smoke chamber valve plate. The valve plate rotation control structure further includes a valve plate rotating shaft driving device for driving the valve plate rotating shaft to rotate a certain angle. One end of the valve plate rotating shaft extends out of the adjustable smoke chamber and is connected to the valve plate rotating shaft driving device.

[0022] Further, the adjustable smoke chamber further includes a smoke chamber frame for supporting each of the smoke chambers. The valve plate rotation control structure further includes a fixed sleeve provided on the smoke chamber frame for inserting the valve plate rotating shaft. There are two fixed sleeves, and the two fixed sleeves are arranged at intervals front and rear. The two ends of the valve plate rotating shaft are respectively inserted into the corresponding fixed sleeves. One end of the valve plate rotating shaft extends out of the corresponding fixed sleeve and is connected to a rocker. A set screw for fixing the position of the valve plate rotating shaft after the smoke chamber valve plate rotates in place is provided on the side wall of one of the fixed sleeves.

[0023] Further, a pre-dust removal device is provided on the main flue gas pipeline between the bag filter and the rotary kiln and / or a post-dust removal device is provided on the main flue gas pipeline between the bag filter and the chimney. The dust removal system further includes a protection branch flue gas pipeline arranged in parallel with the bag filter. The front end of the protection branch flue gas pipeline is connected to the main flue gas pipeline between the bag filter and the pre-dust removal device, and the rear end of the protection branch flue gas pipeline is connected to the main flue gas pipeline between the bag filter and the post-dust removal device. A main pipeline electric valve is provided on the main flue gas pipeline between the front end of the protection branch flue gas pipeline and the bag filter, and a branch pipeline electric valve is provided on the protection branch flue gas pipeline. A flue gas temperature sensor is provided on the main flue gas pipeline between the bag filter and the rotary kiln. The flue gas temperature sensor is signal-connected to the control system of the coal gangue ceramsite production line, and the main pipeline electric valve and the branch pipeline electric valve are respectively control-connected to the control system of the coal gangue ceramsite production line.

[0024] Further, the pre-dust removal device includes a cyclone dust collector for treating the flue gas before entering the bag filter.

[0025] Further, the post-dust removal device includes a scrubbing tower for treating the flue gas after being treated by the bag filter. Description of the Drawings

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings;

[0027] Figure 1 is a structural schematic diagram of a specific embodiment of a coal gangue ceramsite production line;

[0028] Figure 2 is Figure 1 a structural schematic diagram of the dust removal system in;

[0029] Figure 3 is Figure 1 a structural schematic diagram of the adjustable smoke chamber in;

[0030] Figure 4 is Figure 3 the left view of;

[0031] Figure 5 is Figure 4 an enlarged view of part A in;

[0032] Figure 6 is a structural schematic diagram of the connection among the smoke chamber, the intermediate smoke chamber pipeline, and the main flue gas pipeline.

[0033] In the figure: 1000 - rotary kiln, 2000 - dust removal system, 2100 - bag filter, 2200 - cyclone dust collector, 2300 - chimney, 2400 - scrubber, 2500 - adjustable smoke chamber, 2510 - smoke chamber frame, 2521 - smoke chamber communication port, 2520 - smoke chamber, 2530 - dust baffle, 2540 - smoke chamber ash hopper, 2550 - smoke chamber valve plate, 2560 - intermediate smoke chamber pipeline, 2570 - butterfly valve for intermediate smoke chamber pipeline, 2581 - valve plate rotating shaft, 2582 - fixed sleeve, 2583 - rocker, 2584 - set screw, 2585 - screw slot, 2600 - protection branch flue gas pipeline, 2710 - main pipeline electric valve, 2720 - branch pipeline electric valve, 2730 - flue gas temperature sensor, 2740 - pipeline pressure sensor, 2810 - first main flue gas pipeline, 2820 - second main flue gas pipeline. Specific Embodiments

[0034] To make the technical objectives, technical solutions, and beneficial effects of the present invention clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] A specific embodiment of a coal gangue ceramsite production line, as Figures 1 to 6As shown in the figure, it includes a rotary kiln 1000 and a dust removal system 2000 for treating the flue gas discharged from the tail of the rotary kiln 1000. The dust removal system 2000 includes a bag filter 2100, a cyclone dust collector 2200 provided on the first main flue gas pipe 2810 between the bag filter 2100 and the rotary kiln 1000, a scrubbing tower 2400 provided on the second main flue gas pipe 2820 between the bag filter 2100 and the chimney 2300, and an adjustable smoke chamber 2500 provided at the tail of the rotary kiln 1000.

[0036] The dust removal system 2000 further includes a protective branch flue gas pipe 2600 arranged in parallel with the bag filter 2100. The front end of the protective branch flue gas pipe 2600 is connected to the main flue gas pipe between the bag filter 2100 and the cyclone dust collector 2200, and the rear end of the protective branch flue gas pipe 2600 is connected to the main flue gas pipe between the bag filter 2100 and the scrubbing tower 2400. A main pipe electric valve 2710 is provided on the main flue gas pipe between the front end of the protective branch flue gas pipe 2600 and the bag filter 2100, a branch pipe electric valve 2720 is provided on the protective branch flue gas pipe 2600, and a flue gas temperature sensor 2730 and a pipe pressure sensor 2740 are provided on the main flue gas pipe between the bag filter 2100 and the rotary kiln 1000.

[0037] The flue gas temperature sensor 2730 and the pipe pressure sensor 2740 are respectively connected to the control system of the coal gangue ceramsite production line by signals, and the main pipe electric valve 2710 and the branch pipe electric valve 2720 are respectively connected to the control system of the coal gangue ceramsite production line for control.

[0038] The adjustable smoke chamber 2500 includes a smoke chamber frame 2510 and two smoke chambers 2520 arranged side by side left and right. There is a smoke chamber communication port 2521 for the flue gas to pass through between the two smoke chambers 2520. A dust baffle 2530 is provided above the smoke chamber communication port 2521. Smoke chamber ash hoppers 2540 are respectively arranged at the bottoms of the smoke chambers 2520. A smoke chamber valve plate 2550 is rotatably arranged in the smoke chamber communication port 2521 for adjusting the opening degree of the smoke chamber communication port 2521. When the smoke chamber valve plate 2550 is in the vertical state, the smoke chamber communication port 2521 is closed. When the smoke chamber valve plate 2550 is in the horizontal state, the smoke chamber communication port 2521 is fully opened.

[0039] Each smoke chamber 2520 is respectively connected to the main flue gas pipe between the bag filter 2100 and the rotary kiln 1000 through a smoke chamber intermediate pipe 2560, and a butterfly valve 2570 for controlling the opening and closing of the channel is respectively provided on each smoke chamber intermediate pipe 2560.

[0040] During use, the rotation angle of the smoke chamber valve plate 2550 is controlled by a valve plate rotation control structure. The valve plate rotation control structure includes a valve plate rotating shaft 2581 with a rotation axis extending in the front-rear direction. The valve plate rotating shaft 2581 is fixedly connected to the smoke chamber valve plate 2550. On the smoke chamber frame 2510, there are two fixed sleeves 2582 for inserting the valve plate rotating shaft 2581. The two fixed sleeves 2582 are arranged at intervals in the front-rear direction. The two ends of the valve plate rotating shaft 2581 are respectively inserted into the corresponding fixed sleeves 2582. The rear end of the valve plate rotating shaft 2581 extends out of the rear fixed sleeve 2582 and is connected to a rocker 2583. A set screw 2584 is provided on the side wall of the rear fixed sleeve 2582, and a screw slot 2585 for the end of the set screw 2584 to be driven into is provided on the valve plate rotating shaft 2581. During use, the valve plate rotating shaft 2581 is rotated by the rocker 2583. After the smoke chamber valve plate 2550 rotates in place, the set screw 2584 is tightened to press the valve plate rotating shaft 2581.

[0041] During operation, according to the flue gas temperature measured by a flue gas temperature sensor (not shown in the figure) at the tail of the rotary kiln, the rotation angle of the smoke chamber valve plate 2550 is controlled to change the volume of the adjustable smoke chamber 2500, adjust the flue gas flow rate, and further control the flue gas temperature (in this field, the flow rate of the flue gas is positively correlated with the temperature of the flue gas at the rear side of the pipeline, that is, the slower the flue gas flow rate, the lower the temperature of the flue gas when it reaches the rear end). When the flue gas temperature at the tail of the kiln is relatively high (such as higher than 400 °C), the smoke chamber valve plate 2550 is rotated by a certain angle to increase the volume of the smoke chamber 2500, reduce the flue gas flow rate, and reduce the temperature of the flue gas reaching the bag filter 2100. When the flue gas temperature at the tail of the kiln is relatively low (such as lower than 150 °C), the smoke chamber valve plate 2550 is rotated by a certain angle to reduce the volume of the adjustable smoke chamber 2500, reduce the flue gas flow rate, and quickly discharge the humid low-temperature flue gas.

[0042] For the flue gas about to reach the bag filter 2100, when the flue gas temperature sensor 2730 detects that the flue gas temperature exceeds the set value (such as 250 °C) or is lower than the set value (such as 120 °C), the control system of the coal gangue ceramsite production line controls the main pipeline electric valve 2710 to close and the branch pipeline electric valve 2720 to open, so that the high-temperature flue gas does not pass through the bag filter 2100 to avoid the situation of burning or clogging the bags. Usually, after being adjusted by the adjustable smoke chamber 2500, the flue gas temperature can basically be within the range suitable for the operation of the bag filter 2100. Therefore, the situation where the flue gas bypasses the bag filter 2100 through the protection branch flue gas pipeline 2600 is very rare. In this case, only the cyclone dust collector 2200 and the scrubbing tower 2400 are used to treat the flue gas.

[0043] During normal work, the adjustable smoke chamber 2500 is linked with the protection branch, effectively solving the problems of bag burning or bag sticking in the existing bag filter, overcoming the problem of high oxygen content in the tail gas caused by traditional air injection and poor tail gas treatment effect, and making the entire production system work more smoothly.

[0044] Embodiment 2. The difference between Embodiment 2 and Embodiment 1 is that the valve plate rotating shaft in this embodiment is driven by an electric driving device such as a stepping motor, and the stepping motor is controlled and connected to the control system of the coal gangue ceramsite production line. During work, the rotation angle of the smoke chamber valve plate is automatically controlled according to the temperature measured by the temperature sensor at the kiln tail to increase or decrease the volume of the overall smoke chamber.

[0045] Embodiment 3. The difference between Embodiment 3 and Embodiment 1 is that the scrubber and / or cyclone dust collector can be replaced with other structural forms or types of dust removal devices. For example, the cyclone dust collector can be replaced with an inertial dust collector, and the scrubber can be replaced with a gravity spray dust collector, etc.

[0046] Embodiment 4. The difference between Embodiment 4 and Embodiment 1 is that the adjustable smoke chamber includes three or more smoke chambers, and smoke chamber communication ports, smoke chamber valve plates, valve plate rotation control structures, etc. are provided between adjacent smoke chambers.

[0047] The embodiments of the rotary kiln tail gas dust removal system of the present invention have the same structure as the dust removal system in any of the above embodiments of the coal gangue ceramsite production line, so no repeated description will be given.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Any equivalent replacement of the present invention and any modification or partial replacement that does not deviate from the spirit and scope of the present invention shall be covered by the scope of protection of the claims of the present invention.

Claims

1. Rotary kiln tail gas dust removal system, including a bag filter, characterized in that: The rotary kiln tail gas dust removal system further includes an adjustable smoke chamber arranged at the tail of the rotary kiln. The adjustable smoke chamber includes two or more smoke chambers arranged in parallel. A smoke chamber communication port for the flue gas to pass through is provided between adjacent smoke chambers. The adjustable smoke chamber further includes a smoke chamber valve plate rotatably arranged in the smoke chamber communication port for adjusting the opening degree of the smoke chamber communication port. Each smoke chamber is respectively connected to the main flue gas pipeline between the bag filter and the rotary kiln through a middle smoke chamber pipeline. The adjustable smoke chamber further includes a valve plate rotation control structure for controlling the rotation of the smoke chamber valve plate. Butterfly valves for the middle smoke chamber pipelines are respectively arranged on each middle smoke chamber pipeline. The valve plate rotation control structure includes a valve plate rotating shaft with a rotation axis extending in the front-back direction. The valve plate rotating shaft is fixedly connected to the smoke chamber valve plate. The valve plate rotation control structure further includes a valve plate rotating shaft driving device for driving the valve plate rotating shaft to rotate by a certain angle. One end of the valve plate rotating shaft extends out of the adjustable smoke chamber and is connected to the valve plate rotating shaft driving device. The valve plate rotation control structure further includes fixed sleeves arranged on the smoke chamber frame for inserting the valve plate rotating shaft. There are two fixed sleeves, and the two fixed sleeves are arranged at intervals in the front-back direction. The two ends of the valve plate rotating shaft are respectively inserted into the corresponding fixed sleeves. One end of the valve plate rotating shaft extends out of the corresponding fixed sleeve and is connected to a rocker. A set screw for fixing the position of the valve plate rotating shaft after the smoke chamber valve plate rotates in place is provided on the side wall of one of the fixed sleeves.

2. The rotary kiln tail gas dust removal system according to claim 1, wherein: A dust baffle is provided above the corresponding smoke chamber communication port between adjacent smoke chambers. A smoke chamber ash hopper for discharging the dust in the smoke chamber is respectively arranged at the bottom of each smoke chamber.

3. The rotary kiln tail gas dust removal system according to claim 1, characterized in that: The adjustable smoke chamber further includes a tail gas temperature sensor for detecting the temperature of the flue gas at the tail of the rotary kiln. The tail gas temperature sensor is used for signal connection with the control system of the coal gangue ceramsite production line. The valve plate rotation control structure is used for control connection with the control system of the coal gangue ceramsite production line.

4. The rotary kiln tail gas dust removal system according to claim 1, characterized in that: Each smoke chamber is arranged side by side left and right. A channel port for connecting the middle smoke chamber channel is provided on the front side wall of each smoke chamber.

5. The rotary kiln tail gas dust removal system according to claim 3, characterized in that: The adjustable smoke chamber further includes a smoke chamber frame for supporting each smoke chamber.

6. The rotary kiln tail gas dust removal system according to any one of claims 1-5, characterized in that: A pre-dust removal device is arranged on the main flue gas pipeline between the bag filter and the rotary kiln and / or a post-dust removal device is arranged on the main flue gas pipeline between the bag filter and the chimney. The rotary kiln tail gas dust removal system further includes a protection branch flue gas pipeline arranged in parallel with the bag filter. The front end of the protection branch flue gas pipeline is connected to the main flue gas pipeline between the bag filter and the pre-dust removal device. The rear end of the protection branch flue gas pipeline is connected to the main flue gas pipeline between the bag filter and the post-dust removal device. A main pipeline electric valve is arranged on the main flue gas pipeline between the front end of the protection branch flue gas pipeline and the bag filter. A branch pipeline electric valve is arranged on the protection branch flue gas pipeline. A flue gas temperature sensor is arranged on the main flue gas pipeline between the bag filter and the rotary kiln. The flue gas temperature sensor is used for signal connection with the control system of the coal gangue ceramsite production line. The main pipeline electric valve and the branch pipeline electric valve are respectively used for control connection with the control system of the coal gangue ceramsite production line.

7. The rotary kiln tail gas dust removal system according to claim 6, characterized in that: The pre-dust removal device includes a cyclone dust collector for treating the flue gas before entering the bag filter.

8. The rotary kiln tail gas dust removal system according to claim 6, characterized in that: The post-dust removal device includes a scrubbing tower for treating the flue gas treated by the bag filter.

9. Coal gangue ceramsite production line, including a rotary kiln and a dust removal system for treating the flue gas discharged from the tail of the rotary kiln, characterized in that: The dust removal system is the rotary kiln tail gas dust removal system described in any one of the above claims 1-8.

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