Rotary kiln improved structure capable of reducing kiln tail pollutant emission

Abstract

The invention relates to the technical field of rotary kiln tail gas treatment, and discloses a rotary kiln improved structure capable of reducing kiln tail pollutant emission, the rotary kiln improved structure comprises a rotary kiln body, the right side of the rotary kiln body is sequentially provided with a combustion chamber, a first purification chamber and a second purification chamber, the inner wall of the combustion chamber is of a double-layer structure, and an outer coil pipe is arranged between the double-layer inner wall; an inner coil pipe is arranged in the combustion chamber; a circulating box is arranged at the bottom of the combustion chamber; a sprayer is rotationally arranged at the top of the inner side of the first purification chamber, a driving assembly is arranged on the sprayer, and a material collector is arranged below the sprayer; a dust collection bag is arranged at the bottom of the inner side of the second purification chamber, a gas collection tower is arranged above the dust collection bag, exhaust holes are formed in the gas collection tower, and activated carbon balls are arranged on the periphery of the gas collection tower. The waste gas treatment and energy utilization are innovated in multiple aspects, heat is collected and utilized, the contact rate between spraying liquid and gas is increased, the denitration rate is increased, the utilization rate of reaction liquid is increased, and the impurity removal efficiency is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kiln tail gas treatment, and in particular to an improved structure of a rotary kiln for reducing kiln tail pollutant emissions. Background Art

[0002] A rotary kiln refers to a rotating calcining kiln (commonly known as a rotary kiln), which belongs to the category of building materials equipment. Rotary kilns can be divided into cement kilns, metallurgical chemical kilns and lime kilns according to the different materials they process. Cement kilns are mainly used to calcine cement clinker, and are divided into two categories: dry-process cement kilns and wet-process cement kilns. Metallurgical chemical kilns are mainly used in the metallurgical industry for magnetization roasting of lean iron ore in steel plants; oxidation roasting of chromium and nickel iron ores; roasting of high-alumina vanadium ore in refractory plants and roasting of clinker and aluminum hydroxide in aluminum plants; and roasting of chromium ore sand and chromium ore powder and other minerals in chemical plants. Lime kilns (i.e. active lime kilns) are used to roast active lime and light-burned dolomite for use in steel plants and ferroalloy plants.

[0003] The existing application publication number CN210689244U discloses a new device for collecting tail gas emissions from a rotary kiln, wherein a pressure pipe is welded to the upper surface of the box, a second air supply pipe is welded behind the pressure pipe, a gas storage tank is welded to the rear of the second air supply pipe, a filter plate is arranged on the upper side of the inside of the box, the filter plate is snap-connected to the box, a carbon plate is arranged at the bottom of the filter plate, the carbon plate is snap-connected to the box, a buckle plate is arranged at the bottom of the box, and the buckle plate is snap-fitted to the box. The setting of the rotary drum in the utility model ensures that the unburned carbon monoxide can be fully burned, and the filter plate arranged inside the purification box can ensure that large dust particles will not fall into the pipe, while small dust particles will be adsorbed on the activated carbon plate, and the activated carbon plate can also be disassembled and replaced regularly, which ensures the processing efficiency of the machine and also ensures that the tail gas treatment meets the standards.

[0004] However, this solution still has some shortcomings. During the combustion of fuel, the generation of nitrogen oxides is part of the combustion reaction: the nitrogen oxides generated by combustion are mainly NO and NO 2 , collectively referred to as NO X NO in the atmosphere X When dissolved in water, it will generate nitric acid rain, which will cause widespread harm to the environment and cause huge economic losses. However, this device lacks the necessary process to remove nitrogen oxides and directly emits them into the air, which will cause air pollution.

[0005] Therefore, it is necessary to provide an improved rotary kiln structure that reduces pollutant emissions from the kiln tail to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an improved structure of a rotary kiln for reducing the emission of pollutants at the kiln tail.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an improved structure of a rotary kiln for reducing pollutant emissions at the kiln tail, comprising a rotary kiln body, a combustion chamber, a first purification chamber and a second purification chamber are sequentially arranged on the right side of the rotary kiln body, the inner wall of the combustion chamber is a double-layer structure, and an outer coil is arranged between the double-layer inner walls, an inner coil is arranged inside the combustion chamber, both ends of the outer coil and the inner coil extend out of the combustion chamber and are connected to a water tank, and a circulation box is arranged at the bottom of the combustion chamber;

[0008] A sprayer is rotatably provided on the inner top of the first purification chamber, a driving assembly is provided on the sprayer, a material collector is provided below the sprayer, a liquid storage tank is provided outside the first purification chamber, the liquid storage tank is connected to the bottom of the first purification chamber through a liquid storage recovery pipe, and a liquid circulation pump is provided on the liquid storage recovery pipe;

[0009] A dust bag is provided at the inner bottom of the second purification chamber, a gas collecting hood is provided at the bottom of the dust bag, a gas collecting tower is provided above the dust bag, an exhaust hole is opened on the gas collecting tower, and activated carbon balls are provided around the gas collecting tower.

[0010] Preferably, the upper end of the sprayer is connected to a sprayer connecting pipe, the liquid storage tank and the sprayer connecting pipe are connected through a liquid adding pipe, the liquid adding pipe and the sprayer connecting pipe are inserted and rotatably connected, and a sealing ring is provided at the connection between the liquid adding pipe and the sprayer connecting pipe, a pipe sleeve is provided around the sealing ring, and a bearing is provided between the sprayer connecting pipe and the pipe sleeve.

[0011] Preferably, the driving assembly includes a second driving motor arranged on the top of the first purification chamber, the output end of the second driving motor is connected to a driving gear, the sprinkler connecting pipe is sleeved with a driven gear, and the driving gear and the driven gear are meshed with each other.

[0012] Preferably, the combustion chamber and the circulation box are interconnected, a fan is provided inside the circulation box, a first drive motor is connected to the bottom of the circulation box via a first drive motor bracket, and an output end of the first drive motor is connected to the fan.

[0013] Preferably, the rotary kiln body is connected to the combustion chamber through an air inlet pipe, the right end of the air inlet pipe is connected to the bottom of the combustion chamber, a water circulation pump is provided at the connection between the outer coil and the inner coil and the water tank, a temperature meter is provided on the outside of the water tank, and a water inlet pipe and a water outlet pipe are provided on the water tank.

[0014] Preferably, the front cross-section of the material collector is a triangular structure, and one side surface of the material collector is connected to the inner wall of the first clean room.

[0015] Preferably, the combustion chamber is connected to the first purification chamber via a first gas connecting pipe, the first purification chamber is connected to the second purification chamber via a second gas connecting pipe, and an exhaust pipe is provided at the top of the second purification chamber.

[0016] Preferably, a filter is provided at the bottom of the first purification chamber, the left side of the first gas connecting pipe is connected to the top of the combustion chamber, the connection between the first gas connecting pipe and the first purification chamber is located between the filter and the collector, the connection between the second gas connecting pipe and the first purification chamber is located above the sprayer, and the connection between the second gas connecting pipe and the second purification chamber is located below the gas collecting hood.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, the gas enters the combustion chamber through the air inlet pipe for secondary combustion, ensuring that the unburned monoxide can be fully burned, and at the same time, heat is transferred to the inner coil. The water circulation pump transports the cold water inside the water tank to the inner coil, which is heated inside the inner coil, and then the hot water is returned to the water tank, and is monitored by a thermometer to collect and utilize the heat. The inner wall of the combustion chamber adopts a double-layer structure to improve the internal insulation effect. The outer coil is in direct contact with the inner wall of the combustion chamber, and the inner coil is in contact with the gas, thereby increasing the thermal energy utilization rate.

[0019] 2. In the present invention, ammonia liquid is added to the liquid storage tank, a water pump is provided on the liquid adding pipe, and the ammonia liquid is transported to the sprayer through the liquid adding pipe for denitrification treatment. At the same time, large particles fall into the filter net after contacting water, and the liquid is collected at the bottom of the first purification chamber and recycled to the liquid storage tank through the liquid storage recovery pipe, thereby improving the utilization rate of the reaction liquid.

[0020] 3. In the present invention, by starting the second driving motor, the second driving motor drives the driving gear to rotate, the driving gear and the driven gear are meshed with each other, and then the driven gear drives the sprayer connecting pipe to rotate, and the sprayer connecting pipe and the sprayer are fixedly connected, thereby realizing the rotation spraying of the sprayer, improving the contact rate between the spraying liquid and the gas, and improving the denitrification rate.

[0021] 4. In the present invention, by starting the first drive motor, the first drive motor drives the fan to rotate, so that the combustion of the gas to be burned inside the combustion chamber is accelerated, and at the same time the internal gas fluidity is improved, so that the heat of the gas is quickly transferred to the outer coil and the inner coil, thereby enhancing the heat recovery utilization rate; when the subsequent gas is transferred to the first purification chamber, the fan rotation can quickly transfer the gas.

[0022] 5. In the present invention, the two inclined structures of the collector, the lower inclined surface ensures that the gas is gathered, which is convenient for contact with the sprinkler on the top, thereby improving the denitrification effect; at the same time, the liquid after the reaction can quickly slide down to the first purification chamber through the upper inclined surface structure.

[0023] 6. In the present invention, the second purification chamber can perform secondary dust removal on the gas, and at the same time, the gas is gathered through the gas collection tower, discharged centrally through the exhaust holes of the gas collection tower, and contacted with the activated carbon balls to further adsorb and remove impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 A cross-sectional view of the internal structure of the combustion chamber of the present invention;

[0026] Figure 3 is a cross-sectional view of the internal structure of the first purification chamber of the present invention;

[0027] Figure 4 is a cross-sectional view of the internal structure of the second purification chamber of the present invention;

[0028] Figure 5 This is a schematic diagram of the internal structure of the circulation box of the present invention;

[0029] Figure 6 This is a schematic diagram of the internal structure of the pipe sleeve of the present invention;

[0030] Figure 7 for Figure 3 A magnified view of the structure in the middle.

[0031] In the figure: 1-rotary kiln body; 2-combustion chamber; 21-outer coil; 22-inner coil; 3-first purification chamber; 31-sprinkler; 32-collector; 33-filter; 34-pipe sleeve; 35-sealing ring; 36-bearing; 37-sprinkler connecting pipe; 38-second drive motor; 381-driving gear; 382-driven gear; 4-second purification chamber; 41-dust bag; 42-gas collecting hood; 43-gas collecting tower; 44-activated carbon ball; 5-water tank; 6-circulation box; 61-fan; 62-first drive motor; 63-first drive motor bracket; 7-liquid storage tank; 8-intake pipe; 9-first gas connecting pipe; 10-liquid storage recovery pipe; 11-liquid adding pipe; 12-second gas connecting pipe; 13-exhaust pipe. DETAILED DESCRIPTION

[0032] The present invention is described clearly below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description herein is only used to explain the present invention, but is not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] See also Figure 1-Figure 7 The present invention provides an embodiment: an improved structure of a rotary kiln for reducing pollutant emissions at the kiln tail, comprising a rotary kiln body 1, a combustion chamber 2, a first purification chamber 3 and a second purification chamber 4 are sequentially arranged on the right side of the rotary kiln body 1, the inner wall of the combustion chamber 2 is a double-layer structure, and an outer coil 21 is arranged between the double-layer inner walls, an inner coil 22 is arranged inside the combustion chamber 2, both ends of the outer coil 21 and the inner coil 22 extend out of the combustion chamber 2 and are connected to a water tank 5, a circulation box 6 is arranged at the bottom of the combustion chamber 2, the rotary kiln body 1 and the combustion chamber 2 are connected through an air intake pipe 8, the right end of the air intake pipe 8 is connected to the bottom of the combustion chamber 2, a water circulation pump is arranged at the connection between the outer coil 21 and the inner coil 22 and the water tank 5, a temperature meter is arranged on the outside of the water tank 5, and a water inlet pipe and a water outlet pipe are arranged on the water tank 5.

[0036] The gas enters the combustion chamber 2 through the air intake pipe 8 for secondary combustion, ensuring that the unburned monoxide can be fully burned. At the same time, heat is transferred to the inner coil 22. The water circulation pump transports the cold water inside the water tank 5 to the inner coil 22, which is heated inside the inner coil 22, and then the hot water flows back to the water tank 5. It is monitored by a thermometer and the heat is collected and utilized. The inner wall of the combustion chamber 2 adopts a double-layer structure to improve the internal insulation effect. The outer coil 21 is in direct contact with the inner wall of the combustion chamber 2, and the inner coil 22 is in contact with the gas, thereby increasing the thermal energy utilization rate.

[0037] A sprayer 31 is rotatably provided at the inner top of the first purification chamber 3, a driving assembly is provided on the sprayer 31, a collector 32 is provided below the sprayer 31, a liquid storage tank 7 is provided outside the first purification chamber 3, the liquid storage tank 7 is connected to the bottom of the first purification chamber 3 through a liquid storage recovery pipe 10, and a liquid circulation pump is provided on the liquid storage recovery pipe 10, the combustion chamber 2 and the first purification chamber 3 are connected through a first gas connecting pipe 9, a filter screen 33 is provided at the bottom of the first purification chamber 3, the left side of the first gas connecting pipe 9 is connected to the top of the combustion chamber 2, and the connection between the first gas connecting pipe 9 and the first purification chamber 3 is located between the filter screen 33 and the collector 32.

[0038] By adding ammonia liquid into the liquid storage tank 7, a water pump is provided on the liquid adding pipe 11, and the ammonia liquid is transported to the sprayer 31 through the liquid adding pipe 11 for denitrification treatment. At the same time, large particles fall into the filter net 33 after contacting water, and the liquid is collected at the bottom of the first purification chamber 3 and recovered to the liquid storage tank 7 through the liquid storage recovery pipe 10 for recycling.

[0039] A dust bag 41 is provided at the inner bottom of the second purification chamber 4, a gas collecting hood 42 is provided at the bottom of the dust bag 41, a gas collecting tower 43 is provided above the dust bag 41, an exhaust hole is opened on the gas collecting tower 43, and activated carbon balls 44 are provided around the gas collecting tower 43. The first purification chamber 3 and the second purification chamber 4 are connected through the second gas connecting pipe 12. The connection between the second gas connecting pipe 12 and the first purification chamber 3 is located above the sprayer 31, and the connection between the second gas connecting pipe 12 and the second purification chamber 4 is located below the gas collecting hood 42. An exhaust pipe 13 is provided at the top of the second purification chamber 4.

[0040] The second purification chamber 4 can perform secondary dust removal on the gas, and at the same time gather the gas through the gas collecting tower 43, discharge it centrally through the exhaust holes of the gas collecting tower 43, and contact with the activated carbon balls 44 to further adsorb and remove impurities.

[0041] Furthermore, the upper end of the sprayer 31 is connected with a sprayer connecting pipe 37, the liquid storage tank 7 is connected with the sprayer connecting pipe 37 through the liquid adding pipe 11, the liquid adding pipe 11 is inserted and rotatably connected with the sprayer connecting pipe 37, and a sealing ring 35 is provided at the connection between the liquid adding pipe 11 and the sprayer connecting pipe 37, a pipe sleeve 34 is provided around the sealing ring 35, and a bearing 36 is provided between the sprayer connecting pipe 37 and the pipe sleeve 34. The driving assembly includes a second driving motor 38 arranged at the top of the first purification chamber 3, and the output end of the second driving motor 38 is connected to a driving gear 381, and a driven gear 382 is sleeved on the sprayer connecting pipe 37, and the driving gear 381 and the driven gear 382 are meshed with each other.

[0042] The liquid adding pipe 11 is fixedly connected to the first purification chamber 3, and the pipe sleeve 34 is fixedly connected to the liquid adding pipe 11; by starting the second driving motor 38, the second driving motor 38 drives the driving gear 381 to rotate, the driving gear 381 and the driven gear 382 are meshed with each other, and then the driven gear 382 drives the sprayer connecting pipe 37 to rotate, and the sprayer connecting pipe 37 is fixedly connected to the sprayer 31, thereby realizing the rotation spraying of the sprayer 31, improving the contact rate between the spraying liquid and the gas, and improving the denitrification rate.

[0043] Furthermore, the combustion chamber 2 and the circulation box 6 are interconnected, a fan 61 is provided inside the circulation box 6, a first drive motor 62 is connected to the bottom of the circulation box 6 via a first drive motor bracket 63, and an output end of the first drive motor 62 is connected to the fan 61.

[0044] By starting the first drive motor 62, the first drive motor 62 drives the fan 61 to rotate, so that the combustion of the gas to be burned inside the combustion chamber 2 is accelerated, and at the same time the internal gas fluidity is improved, so that the heat of the gas is quickly transferred to the outer coil 21 and the inner coil 22, thereby enhancing the heat recovery utilization rate; when the subsequent gas is transferred to the first purification chamber 3, the rotation of the fan 61 can quickly transfer the gas.

[0045] Furthermore, the front cross-section of the material collector 32 is a triangular structure, and one side surface of the material collector 32 is connected to the inner wall of the first clean room 3 .

[0046] The two inclined structures of the collector 32, the lower inclined surface ensures that the gas is gathered to facilitate contact with the sprinkler 31 on the top, thereby improving the denitrification effect; at the same time, the reacted liquid can quickly slide down to the first purification chamber 3 through the upper inclined surface structure.

[0047] Working principle of the present invention:

[0048] (1) The gas enters the combustion chamber 2 through the air inlet pipe 8 for secondary combustion, ensuring that the unburned monoxide can be fully burned. At the same time, heat is transferred to the inner coil 22. The water circulation pump delivers cold water from the water tank 5 to the inner coil 22, which is heated and then returns hot water to the water tank 5. The hot water is monitored by a temperature detector and the heat is collected and utilized.

[0049] (2) Start the first drive motor 62, which drives the fan 61 to rotate, so that the combustion of the gas to be burned in the combustion chamber 2 is accelerated, and the internal gas fluidity is improved, so that the heat of the gas is quickly transferred to the outer coil 21 and the inner coil 22, thereby enhancing the heat recovery rate; when the gas is subsequently transferred to the first purification chamber 3, the fan 61 rotates to quickly transfer the gas;

[0050] (3) Ammonia liquid is added to the liquid storage tank 7. A water pump is provided on the liquid adding pipe 11. The ammonia liquid is transported to the sprayer 31 through the liquid adding pipe 11 for denitration treatment. At the same time, large particles fall into the filter 33 after contacting the water. The liquid is collected at the bottom of the first purification chamber 3 and is recycled to the liquid storage tank 7 through the liquid storage recovery pipe 10. The collector 32 ensures that the gas is gathered.

[0051] (4) The second drive motor 38 is started, and the second drive motor 38 drives the driving gear 381 to rotate. The driving gear 381 and the driven gear 382 are meshed with each other, and then the driven gear 382 drives the sprayer connecting pipe 37 to rotate. The sprayer connecting pipe 37 is fixedly connected to the sprayer 31, so that the sprayer 31 can be rotated and sprayed, thereby improving the contact rate between the spraying liquid and the gas and improving the denitrification rate.

[0052] (5) The gas then flows into the second purification chamber 4, which can perform secondary dust removal on the gas. At the same time, the gas is gathered through the gas collecting tower 43, discharged through the exhaust holes of the gas collecting tower 43, and contacts with the activated carbon balls 44 to further adsorb and remove impurities.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An improved structure of a rotary kiln for reducing pollutant emissions at the kiln tail, comprising a rotary kiln body (1), characterized in that: A combustion chamber (2), a first purification chamber (3) and a second purification chamber (4) are sequentially arranged on the right side of the rotary kiln body (1); the inner wall of the combustion chamber (2) is a double-layer structure, and an outer coil (21) is arranged between the double-layer inner walls; an inner coil (22) is arranged inside the combustion chamber (2); both ends of the outer coil (21) and the inner coil (22) extend out of the combustion chamber (2) and are connected to a water tank (5); a circulation box (6) is arranged at the bottom of the combustion chamber (2); A sprayer (31) is rotatably provided at the top of the inner side of the first purification chamber (3), a driving assembly is provided on the sprayer (31), a material collector (32) is provided below the sprayer (31), a liquid storage tank (7) is provided outside the first purification chamber (3), the liquid storage tank (7) is connected to the bottom of the first purification chamber (3) through a liquid storage recovery pipe (10), and a liquid circulation pump is provided on the liquid storage recovery pipe (10); A dust removal bag (41) is provided at the inner bottom of the second purification chamber (4), a gas collecting hood (42) is provided at the bottom of the dust removal bag (41), a gas collecting tower (43) is provided above the dust removal bag (41), an exhaust hole is provided on the gas collecting tower (43), and activated carbon balls (44) are provided around the gas collecting tower (43).

2. The improved structure of a rotary kiln for reducing pollutant emissions at the kiln tail according to claim 1, characterized in that: The upper end of the sprayer (31) is connected to a sprayer connecting pipe (37), the liquid storage tank (7) and the sprayer connecting pipe (37) are connected via a liquid adding pipe (11), the liquid adding pipe (11) and the sprayer connecting pipe (37) are plug-in rotatably connected, and a sealing ring (35) is provided at the connection between the liquid adding pipe (11) and the sprayer connecting pipe (37), a pipe sleeve (34) is provided around the sealing ring (35), and a bearing (36) is provided between the sprayer connecting pipe (37) and the pipe sleeve (34).

3. The improved structure of a rotary kiln for reducing pollutant emissions at the kiln tail according to claim 2, characterized in that: The driving assembly comprises a second driving motor (38) arranged at the top of the first purification chamber (3); the output end of the second driving motor (38) is connected to a driving gear (381); a driven gear (382) is sleeved on the sprayer connecting pipe (37); the driving gear (381) and the driven gear (382) are meshed with each other.

4. The improved structure of a rotary kiln for reducing pollutant emissions at the kiln tail according to claim 1, characterized in that: The combustion chamber (2) and the circulation box (6) are interconnected, a fan (61) is provided inside the circulation box (6), a first drive motor (62) is connected to the bottom of the circulation box (6) via a first drive motor bracket (63), and an output end of the first drive motor (62) is connected to the fan (61).

5. The improved structure of a rotary kiln for reducing pollutant emissions at the kiln tail according to claim 1, characterized in that: The rotary kiln body (1) is connected to the combustion chamber (2) via an air intake pipe (8), the right end of the air intake pipe (8) is connected to the bottom of the combustion chamber (2), a water circulation pump is provided at the connection between the outer coil (21) and the inner coil (22) and the water tank (5), a temperature measuring device is provided on the outside of the water tank (5), and a water inlet pipe and a water outlet pipe are provided on the water tank (5).

6. The improved structure of a rotary kiln for reducing pollutant emissions at the kiln tail according to claim 1, characterized in that: The front cross-section of the material collector (32) is a triangular structure, and one side surface of the material collector (32) is connected to the inner wall of the first purification chamber (3).

7. The improved structure of a rotary kiln for reducing pollutant emissions at the kiln tail according to claim 1, characterized in that: The combustion chamber (2) and the first purification chamber (3) are connected via a first gas connecting pipe (9), the first purification chamber (3) and the second purification chamber (4) are connected via a second gas connecting pipe (12), and an exhaust pipe (13) is provided at the top of the second purification chamber (4).

8. The improved structure of a rotary kiln for reducing pollutant emissions at the kiln tail according to claim 7, characterized in that: A filter screen (33) is provided at the bottom of the first purification chamber (3); the left side of the first gas connecting pipe (9) is connected to the top of the combustion chamber (2); the connection between the first gas connecting pipe (9) and the first purification chamber (3) is located between the filter screen (33) and the collector (32); the connection between the second gas connecting pipe (12) and the first purification chamber (3) is located above the sprayer (31); and the connection between the second gas connecting pipe (12) and the second purification chamber (4) is located below the gas collecting hood (42).

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