CN111111940B - Transformation method for reducing resistance of preheater and preheating system - Google Patents
Transformation method for reducing resistance of preheater and preheating system Download PDFInfo
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- CN111111940B CN111111940B CN202010091439.5A CN202010091439A CN111111940B CN 111111940 B CN111111940 B CN 111111940B CN 202010091439 A CN202010091439 A CN 202010091439A CN 111111940 B CN111111940 B CN 111111940B
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- 230000004048 modification Effects 0.000 claims description 13
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- 238000003466 welding Methods 0.000 claims description 7
- 230000007480 spreading Effects 0.000 claims description 5
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- 239000000463 material Substances 0.000 abstract description 20
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- 239000004568 cement Substances 0.000 abstract description 6
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
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Abstract
The invention belongs to the technical field of cement industrial production, and particularly relates to a transformation method and a preheating system for reducing the resistance of a preheater, wherein the transformation method comprises the following steps: s1, acquiring operation data of a preheating system and structural data of a preheater, calculating the air speed in an air inlet, an air outlet and a connecting air pipe of the preheater, and carrying out the resistance increase amplitude after the primary calculation system is provided by using a regression formula; s2, under the condition that a kiln tail frame is not changed, the structures of a volute body and an inner barrel of the non-top cyclone are modified; s3, for the top-level C1 cyclone, the cylinder and the volute body are integrally transformed into a low-resistance high-efficiency cyclone; s4, reforming the connecting air pipe; s5, the transformation material scattering box is positioned at 1.0-2.0m at the bottom of the connecting air pipe. The cyclone cylinder in the pre-decomposition system of the cement production line can still greatly reduce the resistance on the premise of ensuring the separation efficiency, thereby meeting the aims of improving the yield, reducing the consumption and optimizing the upgrading.
Description
Technical Field
The invention belongs to the technical field of cement industrial production, and particularly relates to a transformation method for reducing resistance of a preheater and a preheating system.
Background
Along with the importance of the national control of productivity and environmental protection, energy conservation and consumption reduction are important targets pursued in the technical field of novel dry cement production. The system resistance of the kiln tail preheater is reduced, the running load of the high-temperature fan is reduced, the power consumption of the high-temperature fan can be effectively reduced, and meanwhile, the ventilation and the capacity of the system are facilitated. The kiln tail preheater resistance mainly comes from the cyclone, so that the resistance of the cyclone at each level is reduced, and the resistance reduction and energy saving can be realized by matching with the local transformation of the decomposing furnace and the smoke chamber.
In the existing cement production line technology, commonly adopted resistance reducing measures comprise further enlarging the inlet area, adding a guide plate, designing the top surface of a volute into an inclined plane, arranging an eccentric inner cylinder, enlarging the inner cylinder or shortening the insertion depth of the inner cylinder, or changing the spiral cylinder into a large-specification spiral cylinder, wherein the principle is that the rotation speed of the air flow in the cylinder is reduced, the invalid stroke of the air flow in the cylinder is shortened, the collision between the inlet air flow and the backflow is reduced or avoided, and unnecessary air disturbance is reduced, but the development of the modern preheater technology is seen at the cost of basically reducing the resistance, the visual appearance is that the separation efficiency is reduced, the heat consumption is increased, the investment cost is increased, the parts are easy to wear, the service life of the spiral cylinder is shortened, and a series of resistance reducing sequelae are generated.
Disclosure of Invention
The invention provides a modification method and a preheating system for reducing the resistance of a preheater for solving the technical problems in the prior art, so that the resistance of a cyclone cylinder in a pre-decomposition system of a cement production line can be greatly reduced on the premise of ensuring the separation efficiency, and the invention particularly aims at meeting the purposes of improving the yield and reducing the consumption of the existing production line under the condition of not changing a kiln tail frame.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A modification method for reducing the resistance of a preheater mainly comprises the following steps:
S1, acquiring operation data of a preheating system and structural data of a preheater, calculating the air speed of an air inlet, an air outlet and a connecting air pipe of the preheater, and carrying out the resistance increase amplitude after the primary calculation system is provided by using a regression formula;
The regression formula is:
ΔF Resistance resistor ＝(V After being changed /V before changing )^1.5*F Damage to
Wherein Δf Resistance resistor —resistance increase amplitude after modification;
v After being changed -air inlet speed after being transformed by connecting an air pipe or a volute;
V before changing -air inlet speed before modification of the connecting air pipe or the volute body;
F Damage to -original resistance loss of the system, namely the resistance difference between the air inlet and the air outlet;
The regression formula is applicable to both the volute body and the air pipe;
S2, under the condition of not changing a kiln tail frame, changing the structures and the sizes of the volute body and the inner barrel, integrally reforming the cylinder body and the volute body into a low-resistance non-top cyclone cylinder, so that the inlet wind speed of the volute body is reduced to 13-17 m/S as much as possible, and the wind speed of a connecting wind pipe is 18-24 m/S;
s3, for the top-level C1 cyclone, the top of the cyclone is less limited by a frame, and the original civil engineering open holes can be utilized to not reform the part below the floor, including changing the structures, the sizes and the relative positions of the volute body and the inner barrel; the whole body of the column body and the volute body is transformed into a low-resistance top-level cyclone cylinder;
s4, modifying the connecting air pipe, wherein the modification comprises the steps of expanding the sectional area of the connecting air pipe, changing the shape of the connecting air pipe, and increasing the shrinkage opening in the middle of the connecting air pipe to enable the air speed of the connecting air pipe to be 16-24m/S;
S5, the transformation material scattering box is positioned at 1.0-2.0m at the bottom of the connecting air pipe.
Further, the preheating system obtained by the transformation method comprises a low-resistance non-top cyclone and a low-resistance top cyclone; the top-level cyclone is arranged at the top of the preheater system, and the non-top-level cyclone is arranged below the top-level cyclone;
All the cyclones comprise a connecting air pipe, a volute body, an inner cylinder, a cylinder body, an upper cone and a lower cone;
The connecting air pipe is connected to the inlet of the volute body; the connecting air pipe is provided with an air flow inlet;
The inner cylinder is a cylindrical cylinder body and is connected with the airflow outlet into a whole and fixed in the volute;
The volute body is changed into a three-center equal-height angle-changing volute structure formed by welding three circular arcs with different radiuses; a top cover is arranged at the top of the volute body; an air flow outlet is formed in the center of the top cover;
the column body is a cylindrical hollow shell, and the upper cone and the lower cone are sequentially connected below the column body; the lower cone outlet is a feed opening.
Further, the volute body is formed by welding an R2 arc section taking O2 as a circle center, one end of the R2 arc section is welded with an R1 arc section taking O1 as a circle center, and the other end is welded with an R3 arc section taking O3 as a circle center; the three arc sections are connected with the column body in a mode of equal-height variable angle.
Further, for the non-top-level weak vortex cyclone, the aspect ratio b/a=0.3-0.6 of the airflow inlet, and the ratio Fi/f=0.2-0.5 of the vertical sectional area Fi of the airflow inlet to the sectional area F of the column; the ratio s/a of the insertion depth s of the inner cylinder in the volute body to the air inlet height a=0.3-0.6. The ratio of the eccentricity e1 of the R2 circular arc section to the internal diameter Di of the cylinder is e 1/Di=0.06-0.09, and the eccentricity e 2/Di=0-0.4 of the R3 circular arc section.
Further, for the top-stage weak vortex cyclone, the aspect 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 column is=0.1-0.3, and the ratio s/a of the insertion depth s of the inner cylinder in the volute body to the height a of the airflow inlet is=1.5-2.5. The ratio of the height H of the cyclone to the inner diameter Di of the inner cylinder is H/di=2-5. The eccentricity e 1/Di=0.1-0.2 of the R2 arc segment, and the eccentricity e 2/Di=0 of the R3 arc segment.
Furthermore, the connecting air pipe is opposite to the air inlet and adopts an inclined wall to guide air flow into the volute body; the inclined wall consists of two sections, and the included angle alpha between the inclined wall above and the horizontal direction is 15-20 degrees; the included angle beta between the lower inclined wall and the horizontal direction is 60-70 degrees.
Furthermore, a spreading box is arranged on the connecting air pipe and is positioned at the 1.0-2.0m position at the bottom of the connecting air pipe.
The invention has the advantages and positive effects that:
The invention can predict the resistance increase amplitude after the yield change according to the existing situation; a proper resistance reduction scheme can be formulated according to the existing tower structure; the key factors of material separation efficiency and cyclone resistance reduction are found, and electricity and coal can be saved at the same time. Specific:
the spiral casing body adopts a spiral structure of a large spiral casing with equal height and variable angle and three centers of 270 degrees, and the connection of three circular arcs with different radiuses is smoother, so that air flow can be smoothly introduced into the cyclone, materials reach the wall of the cylinder under the action of inertia force and centrifugal force, and the improvement of material separation efficiency and the reduction of resistance of the cyclone are facilitated;
the spiral line of the spiral case adopts an equal-height angle-changing structure, and the included angle between the outer side wall of the spiral case body connected with the column body 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 spiral case, so that the occurrence of slope accumulation can be effectively prevented, and the interference of collapse material on the air flow in the cyclone can be reduced;
The spiral case body adopts a large spiral case spiral structure, so that the inlet area is larger, the wind speed is lower, the vortex resistance of an inlet area is reduced, and the resistance loss is lower;
The size design of the connecting air pipe is more reasonable, the inlet aspect ratio is between 0.4 and 0.6, and the ratio of the vertical sectional area F of the air flow inlet to the sectional area Fi of the column body is between 0.2 and 0.4; the inlet airflow speed and the rotation speed of airflow in the inner cylinder can be effectively controlled, collision between the inlet airflow and the backflow is reduced or avoided, the air inlet resistance is reduced, and the separation efficiency is improved;
The connecting air pipe is opposite to the air inlet and adopts a smooth and steady inclined wall to guide air flow to enter the volute, and the inclined wall angle gradually increases from top to bottom, so that the structure form not only plays a role in guiding air flow, but also can ensure the air flow stability of the inlet of the cyclone, reduce vortex and reduce resistance.
The cyclone tube is connected with the air tube in a tangential mode, airflow is smoothly transited, separation efficiency is not negatively affected, the change work is small, the cyclone tube is suitable for the limitation of the existing frame, and the effect is considerable.
The transformation of the air pipe and the material scattering box increases the contact area of materials and air flow, provides proper heat exchange air speed, improves the heat exchange effect of the whole preheater, increases the recovery of heat and reduces the energy consumption of the system; the heat exchange effect is better when the position of the material scattering box is closer to the bottom of the connecting air pipe, but the material scattering box is too close to the bottom of the connecting air pipe, so that materials easily fall into the bottom of the connecting air pipe of the next stage, and the material scattering box is improved to be positioned at 1.0-2.0m of the bottom of the connecting air pipe.
Description of the drawings:
FIG. 1 is a front view of a non-top cyclone of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a front view of a top cyclone of the present invention;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic diagram of the gas flow in a cyclone;
FIG. 6 is a left side view of the connecting duct;
fig. 7 is a schematic view of the position of the spreading box on the connecting air duct.
Wherein: 1. connecting an air pipe; 11. an air flow inlet; 12. an outer sidewall; 13. an inclined wall; 14. a material scattering box; 2. a volute casing; 21. a top cover; 22. an air flow outlet; 3. an inner cylinder; 31. a conical cylinder; 4. a column; 5. an upper cone; 6. a lower cone; 61. a feed opening; 7. a floor.
Detailed Description
The drawings in the embodiments of the present invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only a few embodiments of the present invention; but not all embodiments. Based on the embodiments in the present invention; all other embodiments obtained by those skilled in the art without undue burden; all falling within the scope of the present invention.
The invention provides a modification method for reducing the resistance of a preheater, which mainly comprises the following steps:
S1, acquiring operation data of a preheating system and structural data of a preheater, calculating the air speed of an air inlet, an air outlet and a connecting air pipe of the preheater, and carrying out the resistance increase amplitude after the primary calculation system is provided by using a regression formula;
S2, under the condition of not changing a kiln tail frame, modifying the structures of a volute body and an inner barrel of the non-top cyclone, wherein the method comprises the steps of changing the structures and the sizes of the volute body and the inner barrel, so that the inlet wind speed of the volute body is reduced to 13-17 m/S as much as possible, and the wind speed of a connecting wind pipe is 18-24 m/S;
s3, for the top-level C1 cyclone, the top of the cyclone is less limited by a frame, and the original civil engineering open holes can be utilized to not reform the part below the floor, including changing the structures, the sizes and the relative positions of the volute body and the inner barrel; the whole body of the column body and the volute body is transformed into a low-resistance top-level cyclone cylinder;
s4, modifying the connecting air pipe, wherein the modification comprises the steps of expanding the sectional area of the connecting air pipe, changing the shape of the connecting air pipe, and increasing the shrinkage opening in the middle of the connecting air pipe to enable the air speed of the connecting air pipe to be 16-24m/S;
s5, the modified spreading box 14 is positioned at the bottom of the connecting air pipe by 1.0-2.0m.
Wherein, the regression formula in S1 is:
ΔF Resistance resistor ＝(V After being changed /V before changing )^1.5*F Damage to
Wherein Δf Resistance resistor —resistance increase amplitude after modification;
v After being changed -air inlet speed after being transformed by connecting an air pipe or a volute;
V before changing -air inlet speed before modification of the connecting air pipe or the volute body;
F Damage to -the original drag loss of the system, namely the drag difference between the airflow inlet and the airflow outlet.
The regression formula is applicable to both the volute body and the air pipe.
It should be noted that the resistance modification of the whole preheating system comprises modification of the volute body and the connecting air pipe; the resistance of the preheater mainly generates a spinning air cylinder, the volute structure of the spinning air cylinder is a main factor influencing the resistance, the influence of the volute structure on the resistance of the whole system is about 60%, and the air pipe is about 40%.
As shown in fig. 1 to 6, according to the positions provided on the preheater, the cyclone is divided into a top cyclone and a non-top cyclone; the top-level cyclone is arranged at the top of the preheater system, and the non-top-level cyclone is arranged below the top-level cyclone; all the whirlwind cylinders comprise a connecting air pipe 1, a volute body 2, an inner cylinder 3, a cylinder body 4, an upper cone 5 and a lower cone 6; the last cyclone in the non-top cyclone is additionally provided with a flat nozzle air gun, so that the skinning blockage caused by the reducing atmosphere or the stickiness of high-temperature materials is reduced.
The connecting air pipe 1 is arranged at the inlet of the volute body 2; the connecting air pipe 1 is provided with an air inlet 11; the inner cylinder 3 is a cylindrical cylinder body, and the inner cylinder 3 and the airflow outlet 22 are welded into a whole and sleeved in the volute body 2;
The volute body 2 is of a three-center equal-height variable-angle large volute structure formed by welding three circular arcs with different radiuses; the top of the volute 2 is provided with a top cover 21; an air flow outlet 22 is formed in the center of the top cover 21; the connection between the air outlets of the next stage and the air inlets of the previous stage is realized through a connecting air pipe between the adjacent air cylinders;
Specifically, the volute body 2 is formed by welding an R1 arc section taking O1 as a circle center at one end of an R2 arc section taking O2 as a circle center and welding an R3 arc section taking O3 as a circle center at the other end of the R2 arc section; 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 body 4 in an equal-height angle-changing mode; the circular arc connection of the three different radiuses is smoother, so that air flow can be smoothly introduced into the cyclone, materials can reach the wall of the cyclone under the action of inertia force and centrifugal force, and the improvement of material separation efficiency and the reduction of cyclone resistance are facilitated; the spiral line of the spiral case adopts an equal-height angle-changing structure, and the included angle between the outer side wall 12 connected with the spiral case body 2 and the column body 4 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 spiral case. Thus, the occurrence of slope accumulated materials can be effectively prevented, and the interference of collapsed materials to the air flow in the cyclone cylinder is reduced; the large spiral structure is adopted for the volute inlet, so that most of inlet areas and the volute are enlarged, the inlet area is larger, the wind speed is lower, the vortex resistance of the inlet area is reduced, and the resistance loss is lower;
The column body 4 is a cylindrical hollow shell, and the upper cone and the lower cone are sequentially connected below the column body 4; the outlet of the lower cone is a feed opening 61; the upper cone is a straight cone with a reduced diameter from top to bottom, the lower cone is a straight cone or a skewed cone with a reduced diameter from top to bottom, and the included angle between the axis of the skewed cone and the horizontal plane is at least 60 degrees, so that the air flow can be folded conveniently while blanking is not hindered.
Preferably, the air inlet 11 is opposite to the connecting air pipe 1, and a smooth and steady inclined wall 13 is adopted to guide the air flow into the volute 2, specifically, the inclined wall 13 consists of two sections, and the included angle alpha between the upper inclined wall 13 and the horizontal direction is 15-20 degrees; the included angle beta between the lower inclined wall 13 and the horizontal direction is 60-70 degrees; the structure of the inclined wall 13 gradually increases from top to bottom not only plays a role in guiding air flow, but also can ensure stable air flow at the inlet of the cyclone, reduce vortex and reduce resistance.
Preferably, for non-top weak vortex cyclone: the aspect ratio b/a of the air flow inlet 11 is=0.3-0.6, and the ratio Fi/F of the vertical sectional area Fi of the air flow inlet 11 to the sectional area F of the column 4 is=0.2-0.5; the ratio s/a of the insertion depth s of the inner cylinder in the volute body to the air inlet height a=0.3-0.6; the distance A between the position of the connecting air pipe 1 close to the inner cylinder and the inner cylinder is more than 150mm; the inlet airflow speed and the rotation speed of airflow in the inner cylinder 3 can be effectively controlled, collision between the inlet airflow and the backflow is reduced or avoided, the air inlet resistance is reduced, and the separation efficiency is improved; preferably, the inner diameter of the inner cylinder is d, and the effective inner diameter of the cylinder is Di, so that the ratio of the inner diameter d of the inner cylinder to the inner diameter Di of the cylinder is d/Di=0.4-0.60; spiral lines of the spiral cases are sequentially tangent, the eccentricity e1/Di of the R2 circular arc section=0.06-0.09, the eccentricity e2/Di of the R3 circular arc section=0-0.4, and when e2=0, the center point of the R3 circular arc section coincides with the center point of the R1 circular arc section and falls at the center of the cylinder.
For top weak vortex cyclone: the aspect ratio b/a of the airflow inlet 11 is=0.3-0.6, the ratio Fi/F of the vertical sectional area Fi of the airflow inlet 11 to the sectional area F of the column 4 is=0.1-0.3, and the ratio s/a of the insertion depth s of the inner cylinder in the volute body to the height a of the airflow inlet is=1.5-2.5; the distance A between the position of the connecting air pipe 1 close to the inner cylinder and the inner cylinder is more than 500mm; preferably, the ratio of the inner cylinder diameter d to the cylinder diameter Di is d/di=0.3-0.5; the ratio of the height H of the cyclone cylinder to the inner diameter Di of the inner cylinder is H/Di=2-5; preferably, if the inner diameter of the inner cylinder is larger, the conical cylinder 31 can be connected to the air outlet at the bottom of the inner cylinder, so that the inner diameter d1 of the air outlet at the bottom of the conical cylinder meets the range of d 1/di=0.3-0.5, and the conveying rate of the gas and the material can be controlled conveniently. Spiral lines of the spiral case body are sequentially tangent, the eccentricity e1/Di of the R2 circular arc section is=0.1-0.2, the eccentricity e2/Di of the R3 circular arc section is=0, e2=0, and at the moment, the center point of the R3 circular arc section coincides with the center point of the R1 circular arc section and falls at the center of the cylinder.
The top cyclone cylinder consists of two cyclone cylinder monomers which are symmetrically arranged, and the connecting air pipes of the cyclone cylinder monomers are adjacently arranged; the modified top cyclone cylinder is connected with the modified connecting air pipe in a tangential mode, and the air flow carrying dust smoothly transits from the air pipe to enter the cyclone cylinder.
The invention also discloses a working method of the cyclone, which comprises the following steps:
the airflow with the material enters the cyclone cylinder from the airflow inlet 11 connected with the air pipe 1 in a relatively stable manner, and flows downwards along the wall surface of the volute body 2 in a rotating way, and the raw material sequentially enters the blanking port 61 along the wall surfaces of the cylinder 4, the upper cone 5 and the lower cone 6, so that the raw material is discharged out of the cyclone cylinder; the gas is turned back under the action of the upper cone 5 and the lower cone 6, and is discharged out of the cyclone cylinder through the inner cylinder 3 by the airflow outlet 22; realizing the gas-solid separation of dust-containing gas flow.
For a series of multiple preheater stages, gas will enter the gas flow inlet of the next stage preheater from gas flow outlet 22.
Practice shows that the inlet wind speed V Into (I) of the cyclone airflow inlet has great influence on resistance and efficiency, and from the aspect of resistance reduction, V Into (I) is expected to be lower; from the viewpoint of improving the air quantity and efficiency, V Into (I) is higher; when the single V Into (I) exceeds a certain limit, the resistance increases sharply, and the efficiency increases little. The optimal inlet wind speed is different according to the structure of the cyclone preheater and the temperature of the treated gas, and the invention takes V Into (I) = 12-18 m/s; the air flow outlet wind speed V Out of = 13-19m/s. The air speed of the column body is 2-8m/s, and the air speed of the air inlet pipe of the volute is 16-24 m/s; the resistance of a single cyclone can be controlled at 300Pa, the separation efficiency of the non-top cyclone of the resistance balance preheater is considered to reach about 90%, and the separation efficiency of the top cyclone is controlled to be more than 95%.
In the embodiment, two 2500t/d production lines are taken as an example, the resistance of the original five-stage cyclone is higher, the kiln tail preheater is used for reducing the resistance through cyclone modification, the yield of the whole system is improved by 700t/d, the pressure at the outlet of the preheater is reduced by 900Pa, the power consumption of the firing system is reduced by 2.4kWh/t.cl, the ash return amount at the outlet of the preheater is obviously reduced, and a good energy-saving and emission-reducing effect is obtained, and the data are shown in the following table:
Table 1 comparison of effects of preheater before and after resistance reduction and transformation
The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and is not to be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (6)
1. The modification method for reducing the resistance of the preheater is characterized by mainly comprising the following steps of:
S1, acquiring operation data of a preheating system and structural data of a preheater, calculating the air speed of an air inlet, an air outlet and a connecting air pipe of the preheater, and carrying out the resistance increase amplitude after the primary calculation system is provided by using a regression formula;
The regression formula is:
ΔF Resistance resistor ＝(V After being changed /V before changing )^1.5*F Damage to
Wherein Δf Resistance resistor —resistance increase amplitude after modification;
v After being changed -air inlet speed after being transformed by connecting an air pipe or a volute;
V before changing -air inlet speed before modification of the connecting air pipe or the volute body;
F Damage to -original resistance loss of the system, namely the resistance difference between the air inlet and the air outlet;
The regression formula is applicable to both the volute body and the air pipe;
S2, under the condition of not changing a kiln tail frame, changing the structures and the sizes of the volute body and the inner barrel, integrally reforming the cylinder body and the volute body into a low-resistance non-top cyclone cylinder, so that the inlet wind speed of the volute body is reduced to 13-17 m/S as much as possible, and the wind speed of a connecting wind pipe is 18-24 m/S;
S3, for the top-level C1 cyclone, the top of the cyclone is less limited by a frame, and the original civil engineering open holes can be utilized to not modify the parts below the floor, including changing the structures and the sizes of the volute body and the inner barrel; the whole body of the column body and the volute body is transformed into a low-resistance top-level cyclone cylinder;
s4, modifying the connecting air pipe, wherein the modification comprises the steps of expanding the sectional area of the connecting air pipe, changing the shape of the connecting air pipe, and increasing the shrinkage opening in the middle of the connecting air pipe to enable the air speed of the connecting air pipe to be 16-24m/S;
S5, the modified spreading box is positioned at 1.0-2.0m at the bottom of the connecting air pipe;
The preheating system obtained by the transformation method comprises a low-resistance non-top cyclone and a low-resistance top cyclone; the top-level cyclone is arranged at the top of the preheater system, and the non-top-level cyclone is arranged below the top-level cyclone;
All the cyclones comprise a connecting air pipe, a volute body, an inner cylinder, a cylinder body, an upper cone and a lower cone;
The connecting air pipe is connected to the inlet of the volute body; the connecting air pipe is provided with an air flow inlet;
The inner cylinder is a cylindrical cylinder body and is connected with the airflow outlet into a whole and fixed in the volute;
the volute body is changed into a three-center equal-height angle-changing volute structure formed by welding three circular arcs with different radiuses; the three circle centers of the volute body are on the same straight line; a top cover is arranged at the top of the volute body; an air flow outlet is formed in the center of the top cover;
the column body is a cylindrical hollow shell, and the upper cone and the lower cone are sequentially connected below the column body; the lower cone outlet is a feed opening;
For a non-top-level weak vortex cyclone, the aspect ratio b/a of the airflow inlet is=0.3-0.6, and the ratio Fi/F of the vertical sectional area Fi of the airflow inlet to the sectional area F of the column is=0.2-0.5; the ratio s/a of the insertion depth s of the inner cylinder in the volute body to the air inlet height a=0.3-0.6;
For the top-stage weak vortex cyclone, the aspect 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 column is=0.1-0.3, and the ratio s/a of the insertion depth s of the inner cylinder in the volute body to the height a of the airflow inlet is=1.5-2.5;
the connecting air pipe is opposite to the air inlet and adopts an inclined wall to guide air flow into the volute body; the inclined wall consists of two sections, and the included angle alpha between the inclined wall above and the horizontal direction is 15-20 degrees; the included angle beta between the lower inclined wall and the horizontal direction is 60-70 degrees.
2. A method of modifying a preheater with reduced drag as set forth in claim 1, wherein: the volute body is formed by welding an R2 arc section taking O2 as a circle center, wherein one end of the R2 arc section is welded with an R1 arc section taking O1 as a circle center, and the other end of the R2 arc section is welded with an R3 arc section taking O3 as a circle center; the three arc sections are connected with the column body in a mode of equal-height variable angle.
3. A method of modifying a preheater with reduced drag as set forth in claim 2, wherein: the ratio of the eccentricity e1 of the R2 circular arc section to the internal diameter Di of the cylinder is e 1/Di=0.06-0.09, and the eccentricity e 2/Di=0-0.4 of the R3 circular arc section.
4. A method of modifying a preheater with reduced drag as set forth in claim 3, wherein: the ratio of the height H of the cyclone to the inner diameter Di of the inner cylinder is H/di=2-5.
5. A method of modifying a preheater with reduced drag as set forth in claim 3, wherein: the eccentricity e 1/Di=0.1-0.2 of the R2 arc segment, and the eccentricity e 2/Di=0 of the R3 arc segment.
6. A method of modifying a preheater with reduced drag as set forth in claim 1, wherein: the connecting air pipe is provided with a spreading box which is positioned at the 1.0-2.0m position at the bottom of the connecting air pipe.
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