CN211668294U - Seven grades of preheating systems of cement kiln tail - Google Patents
Seven grades of preheating systems of cement kiln tail Download PDFInfo
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- CN211668294U CN211668294U CN202020173847.0U CN202020173847U CN211668294U CN 211668294 U CN211668294 U CN 211668294U CN 202020173847 U CN202020173847 U CN 202020173847U CN 211668294 U CN211668294 U CN 211668294U
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Abstract
The utility model relates to a cement firing equipment field, concretely relates to seven grades of systems of preheating of cement kiln tail. The system comprises a C1-C7 seven-level cyclone, an air pipe, a discharging pipe and a decomposing furnace which are arranged from top to bottom; the top of each cyclone is provided with an air outlet, the side part of each cyclone is provided with an air inlet, and in all the adjacent cyclones, the air inlet of the upper stage cyclone is connected with the air outlet of the lower stage cyclone through an air pipe; all the discharge ports are connected with discharge pipes; the feeding pipe of any one of the C1-C5 cyclones is communicated with the air pipe between the two stages of cyclones behind the cyclone; the decomposing furnace is arranged below all the cyclones; a smoke chamber communicated with the rotary kiln is also arranged below the decomposing furnace; also comprises a high-temperature fan and a raw material feeding pipe. The system can reduce the temperature of the waste gas of the uppermost stage preheater to 220-240 ℃, greatly reduces the heat taken away by the waste gas, and accordingly reduces the heat consumption of a firing system.
Description
Technical Field
The utility model relates to a cement firing equipment field, concretely relates to seven grades of systems of preheating of cement kiln tail.
Background
In the last two decades, the novel dry cement production technology represented by the pre-decomposition technology is widely applied in China. To date, cement predecomposition technology is both a relatively mature and evolving technology. The kiln tail preheating system is key equipment for determining heat consumption of a cement production line, and the domestic technology is mainly a five-stage preheater system at present in the stage number of preheaters. Generally, the temperature of the exhaust gas of the uppermost stage preheater discharged from the firing kiln tail five-stage preheater system is mostly 310 to 350 ℃. Under the conditions that a waste heat power generation system is not available, the raw materials are vertically ground, and the comprehensive moisture is not high, a certain amount of water is needed to be sprayed for cooling, so that the drying requirement of the raw material system is met. Therefore, a large amount of enthalpy of the kiln tail waste gas is not effectively utilized, and water resources are wasted. The temperature of the exhaust gas of the uppermost stage preheater discharged by the six-stage preheater system at the tail of the firing kiln is mostly 250-280 ℃, and certain energy waste also exists.
In order to further reduce the heat consumption of the system and improve the technical and economic indexes, on the basis of optimizing the heat exchange effect of the preheater system, reducing the resistance loss of the preheater system, improving the adaptability of the decomposing furnace system and the like, on the basis of successfully applying the five-stage preheater and the six-stage preheater at the tail of the firing kiln, a seven-stage preheater system is required to be configured to further reduce the energy consumption.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a cement kiln tail seven-level preheating system aiming at the technical problems in the prior art; the system can reduce the temperature of the waste gas of the uppermost stage preheater to 220-240 ℃, greatly reduces the heat taken away by the waste gas, and accordingly reduces the heat consumption of a firing system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a cement kiln tail seven-level preheating system comprises a C1-C7 weak vortex low-resistance cyclone cylinder, an air pipe, a discharging pipe and a decomposing furnace, wherein the cyclone cylinder, the air pipe, the discharging pipe and the decomposing furnace are arranged from top to bottom; the top of each cyclone is provided with an air outlet, the side part of each cyclone is provided with an air inlet, and the bottom of each cyclone is provided with a feed opening; in all the adjacent cyclones, the air inlet of the upper stage cyclone is connected with the air outlet of the lower stage cyclone through an air pipe; all the discharge ports are connected with discharge pipes; the blanking pipes are provided with air locking valves; the feeding pipe of any one of the C1-C5 cyclones is communicated with the air pipe between the two stages of cyclones behind the cyclone;
the decomposing furnace is arranged below all the cyclones; the decomposing furnace is provided with two feeding holes corresponding to different temperature decomposing areas; a discharging pipe of the C6 cyclone is communicated with the feeding hole;
a smoke chamber communicated with the rotary kiln is also arranged below the decomposing furnace, and a discharging pipe of the C7 cyclone cylinder is communicated with the smoke chamber;
the C2-C1 air pipe between the C1 and C2 cyclones is communicated with a raw material feeding pipe;
the high-temperature fan is arranged on the ground; the high-temperature fan is connected with an air outlet at the top of the C1 cyclone cylinder through a pipeline.
Furthermore, a material distributing valve for distributing two C6 material discharging pipes is arranged below the airlock valve of the C6 cyclone.
Furthermore, the cyclone cylinders are divided into top-level cyclone cylinders and non-top-level cyclone cylinders according to the positions arranged on the preheater; the top-level cyclone cylinder is arranged at the top of the preheater system, and the non-top-level cyclone cylinder is arranged below the top-level cyclone cylinder; all the cyclones comprise inlet air pipes, volute bodies, inner cylinders, upper cones and lower cones;
the inlet air pipe is arranged at the inlet of the volute body; the inlet air pipe is provided with an airflow inlet;
the inner cylinder is a cylindrical cylinder body, and the inner cylinder and the airflow outlet are welded into a whole and are sleeved and welded in the volute body;
the volute body is a three-center equal-height angle-variable volute structure formed by welding three arcs with different radiuses; the top of the volute body is provided with a top cover; an airflow outlet is formed in the center of the top cover;
the cylinder is a cylindrical hollow shell, and the upper vertebral body and the lower vertebral body are sequentially connected below the cylinder; the lower vertebral body outlet is a feed opening.
Furthermore, the volute body is composed of an R2 arc section with O2 as a center, one end of the R2 arc section is welded with an R1 arc section with O1 as a center, and the other end of the R2 arc section is welded with an R3 arc section with O3 as a center; the sum of the angles of the three arc sections with different radiuses is 270 degrees, and the three arc sections are connected with the column body in an equal-height angle-changing mode.
Further, for the non-top-level weak vortex cyclone, the width-to-height ratio b/a of the airflow inlet is 0.3-0.6, the ratio Fi/F of the vertical sectional area Fi of the airflow inlet to the sectional area F of the cylinder is 0.2-0.5, and the distance between the position, close to the inner cylinder, of the inlet air pipe and the inner cylinder is larger than 150 mm.
Further, the eccentricity e1/Di of the R2 arc segment is 0.06-0.09, and the eccentricity e2/Di of the R3 arc segment is 0-0.4.
Further, for a top-level weak vortex cyclone: the width-to-height ratio b/a of the airflow inlet is 0.3-0.6, the ratio Fi/F of the vertical sectional area Fi of the airflow inlet to the sectional area F of the cylinder is 0.15-0.25, and the distance between the position, close to the inner cylinder, of the inlet air pipe and the inner cylinder is larger than 500 mm.
Further, the eccentricity e1/Di of the R2 arc segment is 0.1-0.2, and the eccentricity e2/Di of the R3 arc segment is 0.
Furthermore, the inlet air pipe is opposite to the airflow inlet and adopts an inclined wall to guide airflow to enter the volute body; the inclined wall is composed of two sections, the included angle alpha between the upper inclined wall and the horizontal direction is 15-20 degrees and/or the included angle beta between the lower inclined wall and the horizontal direction is 60-70 degrees.
The utility model has the advantages and positive effects that:
the utility model discloses a seven grades of pre-heater systems of high-efficient low resistance has strengthened the heat exchange efficiency of material with gas, has reduced pre-heater exit temperature, reduces the heat that kiln tail waste gas was taken away, will effectively reduce C1 whirlwind section of thick bamboo exhaust gas temperature to 220 ~ 240 ℃, thereby reduce and burn till the heat consumption of system. Under the condition that unit power consumption is not increased, compared with a five-stage preheater, the outlet temperature of the C1 cyclone cylinder can be reduced by 60-120 ℃, the unit heat consumption of clinker can be reduced by 200-300 kJ/kg, and compared with a six-stage preheater, the outlet temperature of the C1 cyclone cylinder can be reduced by 30-60 ℃. The unit heat consumption of clinker can be reduced by 70-150 kJ/kg, and the energy consumption is greatly reduced.
Description of the drawings:
FIG. 1 is a front view of a seven stage preheat system in a preferred embodiment of the present invention;
FIG. 2 is a front view of the cyclone cartridge;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a left side view of the inlet air duct of the present invention;
FIG. 5 is a schematic view of the flow direction of the air flow in the cyclone according to the present invention; wherein the solid lines are inlet flows and the dashed lines are outlet flows.
Wherein: 1. c1 cyclone; 2. c2 cyclone; 3. c3 cyclone; 4. c4 cyclone; 5. c5 cyclone; 6. c6 cyclone; 7. c7 cyclone; 8. a decomposing furnace; 9. a smoking chamber; 10. a raw material feeding pipe; 11. C2-C1 air pipe; 12. c1 discharge pipe; 13. C3-C2 air pipe; 14. c2 discharge pipe; 15. C4-C3 air pipe; 16. c3 discharge pipe; 17. C5-C4 air pipe; 18. c4 discharge pipe; 19. C6-C5 air pipe; 20. c5 discharge pipe; 21. C7-C6 air pipe; 22. c6 discharge pipe; 23. a material distributing valve; 24. c7 discharge pipe; 25. a high temperature fan; 26. an inlet air duct; 26a, an airflow inlet; 26b, an outer side wall; 26c, an inclined wall; 27. a volute housing; 27a, a top cover; 27b, an airflow outlet; 28. an inner barrel; 29. a cylinder; 30. an upper cone; 31. a lower cone; 31a and a feed opening;
Detailed Description
For further understanding of the contents, features and functions of the present invention, the following embodiments will be exemplified in conjunction with the accompanying drawings as follows:
as shown in figure 1, the utility model discloses a cement kiln tail seven-stage preheating system, which comprises a seven-stage cyclone, an air pipe, a blanking pipe and a decomposing furnace 8; the seven-stage cyclone comprises a C1 cyclone 1, a C2 cyclone 2, a C3 cyclone 3, a C4 cyclone 4, a C5 cyclone 5, a C6 cyclone 6 and a C7 cyclone 7 which are arranged from top to bottom; the top of each cyclone is provided with an air outlet, the side part of each cyclone is provided with an air inlet, and the bottom of each cyclone is provided with a feed opening; in all the adjacent cyclones, the air inlet of the upper stage cyclone is connected with the air outlet of the lower stage cyclone through an air pipe; all the discharge ports are connected with discharge pipes; the blanking pipe is provided with an air locking valve; the discharge pipe on any one of the five-stage cyclones from C1 to C5 is communicated with the air pipe between the two stages of cyclones behind the cyclone.
The decomposing furnace 8 is arranged below all the cyclones; the decomposing furnace 8 is provided with a feeding hole; the feed pipe of the C6 cyclone 6 is communicated with the feed inlet.
A smoke chamber 9 communicated with the rotary kiln is further arranged below the decomposing furnace 8, and a discharging pipe of the C7 cyclone cylinder 7 is communicated with the smoke chamber 9.
A C2-C1 air duct 11 between the C1 and the C2 cyclone cylinders 2 is communicated with a raw material feeding pipe 10.
Also comprises a high temperature fan 25 arranged on the ground; the high-temperature fan 25 is connected with an air outlet at the top of the C1 cyclone cylinder 1 through a pipeline, and the high-temperature fan 25 provides air for the whole system.
When the device works, raw materials enter the C2-C1 air duct 11 through the raw material feeding pipe 10, hot air flow pulled by the high-temperature fan 25 is introduced into all air ducts, so that the raw materials heated by rising hot air flow enter the C1 cyclone 1 along with the air flow to carry out gas-solid separation, the separated raw materials enter the C3-C2 air duct 13 from the C1 feeding pipe 12, the raw materials also enter the C2 cyclone 2 to carry out gas-solid separation after being heated, the separated raw materials enter the C4-C8 air duct 68615 from the C2 feeding pipe 14, the separated raw materials enter the C3 cyclone 3 to carry out gas-solid separation after being heated, the separated raw materials enter the C5-C4 air duct 16 from the C3 feeding pipe, the separated raw materials enter the C4 cyclone 6864 to carry out gas-solid separation after being heated, the separated raw materials enter the C6-C5 air duct 19 from the C4 feeding pipe 18, the C5 cyclone 5 to carry out gas-solid separation, the separated raw material feeding pipe 20-C6 air duct from the C5857321, the heated raw materials enter a C6 cyclone 6 for gas-solid separation, the separated raw materials are divided from a C6 blanking pipe 22 and then enter a decomposing furnace 8, the raw materials are carried into a C7 cyclone 7 by hot airflow for gas-solid separation after being decomposed in the decomposing furnace 8, and the separated raw materials enter a smoke chamber 9 from a C7 blanking pipe 24 and finally enter a rotary kiln for calcination.
Since the decomposing furnace 8 is provided with two different feed inlets corresponding to decomposing areas with different temperatures, the C6 cyclone 6 is provided with two C6 blanking pipes 22 communicated with the feed inlets, and a material distributing valve 23 is arranged below the airlock valve of the C6 cyclone 6 so as to distribute materials for the two C6 blanking pipes 22.
Specifically, all the cyclones comprise inlet air pipes 26, volute bodies 27, inner cylinders 28, cylinders 29, upper cones 30 and lower cones 31; the last cyclone cylinder is provided with a flat-nozzle air cannon, so that the skinning blockage caused by reduction atmosphere or high-temperature material stickiness is reduced.
The inlet air pipe 26 is arranged at the inlet of the volute body 27; the inlet air pipe 26 is provided with an airflow inlet 26 a;
the inner cylinder 28 is a cylindrical cylinder, and the inner cylinder 28 and the airflow outlet 27b are welded into a whole and sleeved in the volute body 27;
the volute body 27 is a three-center equal-height angle-variable big volute structure formed by welding three arcs with different radiuses; the top of the worm casing 27 is provided with a top cover 27 a; the center of the top cover 27a is provided with an airflow outlet 27 b; specifically, the volute body 27 is formed by welding an R1 arc segment with O1 as a center at one end of an R2 arc segment with O2 as a center, and welding an R3 arc segment with O3 as a center at the other end; the sum of the angles of the three arc sections with different radiuses is 270 degrees, and the three arc sections are connected with the lower column 29 in an equal-height angle-changing mode; the three arcs with different radiuses are connected more smoothly, so that airflow can be stably led into the cyclone, and materials reach the wall of the cyclone under the action of inertia force and centrifugal force, thereby being beneficial to improving the material separation efficiency and reducing the resistance of the cyclone; the spiral line of the volute adopts an equal-height variable-angle structure, and the included angle between the outer side wall 26b of the volute 27 connected with the cylinder 29 and the horizontal direction is gamma; the included angle gamma is 50 degrees at the air inlet and gradually increases to 90 degrees along the spiral line of the volute. Therefore, the slope material accumulation can be effectively prevented, and the interference of collapsed materials on the airflow in the cyclone barrel is reduced; the volute inlet adopts the large volute spiral structure, so that most of the inlet area and the volute are enlarged, the inlet area is larger, the wind speed is lower, the eddy resistance in the inlet area is reduced, and the resistance loss is lower;
the column 29 is a cylindrical hollow shell, and the upper vertebral body and the lower vertebral body are sequentially connected below the column 29; the outlet of the crooked cone body is a feed opening 31 a. The upper cone body is a straight cone body with the diameter reduced from top to bottom, and the lower cone body is a tilted cone body with the diameter reduced from top to bottom; the minimum included angle between the axis of the askew cone and the horizontal plane is 60 degrees, so that the air flow is convenient to return while the blanking is not hindered.
Preferably, a smooth and stable inclined wall 26c is adopted at a position, facing the airflow inlet 26a, of the inlet air duct 26 to guide airflow to enter the volute body 27, specifically, the inclined wall 26c is composed of two sections, and an included angle α between the upper inclined wall 26c and the horizontal direction is 15-20 °; the included angle beta between the lower inclined wall 26c and the horizontal direction is 60-70 degrees; the structure form that the angle of the inclined wall 26c is gradually increased from top to bottom not only plays a role of airflow guiding, but also can ensure that airflow at the inlet of the cyclone cylinder is stable, reduce vortex and reduce resistance.
Preferably, for a class C2-C7 weak vortex cyclone: the width-to-height ratio b/a of the airflow inlet 26a is 0.3-0.6, the ratio Fi/F of the vertical sectional area Fi of the airflow inlet 26a to the sectional area F of the cylinder 29 is 0.2-0.5, and the ratio s/a of the insertion depth s of the inner cylinder in the volute to the height a of the airflow inlet is 0.3-0.6; the distance between the position of the inlet air pipe 26 close to the inner cylinder and the inner cylinder is more than 150 mm; the speed of the inlet airflow and the rotating speed of the airflow in the inner cylinder 28 can be effectively controlled, the collision of the inlet airflow and the backflow is reduced or avoided, and the separation efficiency is improved; preferably, if the inner diameter of the inner cylinder is d and the effective inner diameter of the cylinder is Di, the ratio of the inner diameter d of the inner cylinder to the inner diameter Di of the cylinder is d/Di of 0.4-0.6; the spiral lines of the volute body are sequentially tangent, the eccentricity e1/Di of the R2 arc section is 0.06-0.09, the eccentricity e2/Di of the R3 arc section is 0-0.4, and when e2 is 0, the center point of the R3 arc section and the center point of the R1 arc section are superposed and fall at the center of a cylinder;
for a C1 class weak vortex cyclone: the width-to-height ratio b/a of the airflow inlet 26a is 0.3-0.6, the ratio Fi/F of the vertical sectional area Fi of the airflow inlet 26a to the sectional area F of the cylinder 29 is 0.15-0.25, and the ratio s/a of the insertion depth s of the inner cylinder in the volute to the height a of the airflow inlet is 1.5-2.5; the distance between the position of the inlet air pipe 26 close to the inner cylinder and the inner cylinder is more than 500 mm; preferably, the ratio of the inner diameter d of the inner cylinder to the inner diameter Di of the cylinder is d/Di of 0.3-0.5, the spiral lines of the volute bodies are sequentially tangent, the eccentricity e1/Di of the R2 arc section is 0.1-0.2, the eccentricity e2/Di of the R3 arc section is 0, and the eccentricity e2 is 0, wherein the center point of the R3 arc section is coincident with the center point of the R1 arc section and falls at the center of the cylinder. Preferably, the top-level cyclone is composed of two symmetrically arranged cyclone monomers, and inlet air pipes of the cyclone monomers are arranged adjacently.
Experimental research and engineering practice show that the inlet wind speed v of the airflow inletIntoThe influence on the resistance and the efficiency is large, and v is desirable from the viewpoint of resistance reductionIntoLower level; v from the viewpoint of improving the air volume and efficiencyIntoHigher, better; single vIntoBeyond a certain limit, the resistance increases dramatically, and the efficiency increases only slightly. The optimum inlet wind speed is different due to the structure of the cyclone preheater and the different temperature of the processing gas, the utility model discloses get VInto12-18 m/s; air flow velocity V of air flow outletGo out13-19 m/s. The air speed of the cylinder is 2-8m/s, and the air speed of an inlet air pipe of the volute is 16-24 m/s; the utility model discloses the resistance of well single cyclone can be controlled at 300Pa, considers that the non-top cyclone separation efficiency of resistance balance pre-heater reaches about 90%, and top cyclone separation efficiency control is more than 95%.
The utility model discloses a seven grades of pre-heater systems of high-efficient low resistance has strengthened the heat exchange efficiency of material with gas, has reduced pre-heater exit temperature, reduces the heat that kiln tail waste gas was taken away, will effectively reduce C1 whirlwind section of thick bamboo exhaust gas temperature to 220 ~ 240 ℃, thereby reduce and burn till the heat consumption of system. Under the condition that unit power consumption is not increased, the temperature of the outlet of the C1 preheater is 220-240 ℃, compared with a five-stage preheater, the outlet temperature can be reduced by 60-120 ℃, the unit heat consumption of clinker can be reduced by 200-300 kJ/kg, compared with a six-stage preheater, the outlet temperature of the C1 cyclone cylinder can be reduced by 30-60 ℃, and the unit heat consumption of clinker can be reduced by 70-150 kJ/kg. The standard coal consumption is less than or equal to 90kgce/t.cl, the value is lower than that of any conventional multi-stage preheater, and the energy consumption is greatly reduced.
The significance of the seven-stage preheater lies in that the heat exchange efficiency is increased by adding the two-stage preheater, and if the two-stage preheater is not optimized, the resistance of the preheater system can also be greatly increased, so that the power consumption of the high-temperature fan 25 is increased, the cyclone cylinder adopts a weak vortex low-resistance cyclone cylinder, the resistance of the cyclone cylinder is reduced while the higher separation efficiency is kept, and under the same yield and the specification of the preheater system, the outlet pressure of the C1 cyclone cylinder of the seven-stage preheater can be as low as 5000-5500 pa, which is only equivalent to the pressure of a general five-stage preheater system.
The increase of pre-heater progression can lead to the rising of pylon height usually, and the civil engineering cost can increase substantially, the utility model discloses seven grades of pre-heaters can adopt low pylon design, reduce the pylon height, make it more have economic practicality.
The embodiments of the present invention have been described in detail, but the above description is only for the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (9)
1. The utility model provides a seven grades of preheating systems of cement kiln tail which characterized in that: the system comprises a C1-C7 weak vortex low-resistance cyclone cylinder, an air pipe, a discharging pipe and a decomposing furnace which are arranged from top to bottom; the top of each cyclone is provided with an air outlet, the side part of each cyclone is provided with an air inlet, and the bottom of each cyclone is provided with a feed opening; in all the adjacent cyclones, the air inlet of the upper stage cyclone is connected with the air outlet of the lower stage cyclone through an air pipe; all the discharge ports are connected with discharge pipes; the blanking pipes are provided with air locking valves; the feeding pipe of any one of the C1-C5 cyclones is communicated with the air pipe between the two stages of cyclones behind the cyclone;
the decomposing furnace is arranged below all the cyclones; the decomposing furnace is provided with two feeding holes corresponding to different temperature decomposing areas; a discharging pipe of the C6 cyclone is communicated with the feeding hole;
a smoke chamber communicated with the rotary kiln is also arranged below the decomposing furnace, and a discharging pipe of the C7 cyclone cylinder is communicated with the smoke chamber;
the C2-C1 air pipe between the C1 and C2 cyclones is communicated with a raw material feeding pipe;
the high-temperature fan is arranged on the ground; the high-temperature fan is connected with an air outlet at the top of the C1 cyclone cylinder through a pipeline.
2. The cement kiln tail seven-stage preheating system of claim 1, wherein: a material distributing valve for distributing two C6 material discharging pipes is arranged below the airlock valve of the C6 cyclone cylinder.
3. The cement kiln tail seven-stage preheating system of claim 1, wherein: the C1-C7 cyclone cylinders respectively comprise an inlet air pipe, a volute body, an inner cylinder, a cylinder, an upper cone and a lower cone;
the inlet air pipe is arranged at the inlet of the volute body; the inlet air pipe is provided with an airflow inlet;
the inner cylinder is a cylindrical cylinder body, and the inner cylinder and the airflow outlet are welded into a whole and are sleeved and welded in the volute body;
the volute body is a three-center equal-height angle-variable volute structure formed by welding three arcs with different radiuses; the top of the volute body is provided with a top cover; an airflow outlet is formed in the center of the top cover;
the cylinder is a cylindrical hollow shell, and the upper cone and the lower cone are sequentially connected below the cylinder; the outlet of the lower cone is a feed opening.
4. The cement kiln tail seven-stage preheating system of claim 3, wherein: the volute body is composed of an R2 circular arc section with O2 as a center, one end of the R2 circular arc section is welded with an R1 circular arc section with O1 as a center, and the other end of the R2 circular arc section is welded with an R3 circular arc section with O3 as a center; the three arc sections are connected with the column body in an equal-height variable-angle mode.
5. The cement kiln tail seven-stage preheating system of claim 4, wherein: for the non-top-level weak vortex cyclone, the width-to-height ratio b/a of the airflow inlet is 0.3-0.6; and/or the ratio Fi/F of the vertical sectional area Fi of the airflow inlet to the sectional area F of the cylinder is 0.2-0.5; and/or the distance between the position of the inlet air pipe close to the inner cylinder and the inner cylinder is more than 150 mm.
6. The cement kiln tail seven-stage preheating system of claim 4, wherein: the eccentricity e1/Di of the R2 circular arc segment is 0.06-0.09, and the eccentricity e2/Di of the R3 circular arc segment is 0-0.4.
7. The cement kiln tail seven-stage preheating system of claim 4, wherein: for a top-level weak vortex cyclone: the width-to-height ratio b/a of the airflow inlet is 0.3-0.6, the ratio Fi/F of the vertical sectional area Fi of the airflow inlet to the sectional area F of the cylinder is 0.15-0.25, and the distance between the position, close to the inner cylinder, of the inlet air pipe and the inner cylinder is larger than 500 mm.
8. The cement kiln tail seven-stage preheating system of claim 7, wherein: the eccentricity e1/Di of the R2 circular arc segment is 0.1-0.2, and the eccentricity e2/Di of the R3 circular arc segment is 0.
9. The cement kiln tail seven-stage preheating system of claim 3, wherein: the inlet air pipe is opposite to the airflow inlet and guides airflow into the volute casing by adopting an inclined wall; the inclined wall is composed of two sections, the included angle alpha between the upper inclined wall and the horizontal direction is 15-20 degrees and/or the included angle beta between the lower inclined wall and the horizontal direction is 60-70 degrees.
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