CN211801694U - Preheating system for reducing resistance of preheater - Google Patents
Preheating system for reducing resistance of preheater Download PDFInfo
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- CN211801694U CN211801694U CN202020168258.3U CN202020168258U CN211801694U CN 211801694 U CN211801694 U CN 211801694U CN 202020168258 U CN202020168258 U CN 202020168258U CN 211801694 U CN211801694 U CN 211801694U
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Abstract
The utility model belongs to the technical field of cement industry production, in particular to reduce preheating system of pre-heater resistance. Comprises a low-resistance non-top cyclone cylinder and a low-resistance top cyclone cylinder; all the cyclones comprise connecting air pipes, volute bodies, inner cylinders, upper cones and lower cones; the connecting air pipe is connected to the inlet of the volute; the connecting 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 connected into a whole and fixed in the volute body; after the volute body is improved, a three-center equal-height variable-angle volute structure formed by welding three arcs with different radiuses is adopted; 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 an upper cone body and a lower cone body are sequentially connected below the cylinder; the outlet of the lower vertebral body is a feed opening. The cyclone cylinder in the pre-decomposition system of the cement production line can still greatly reduce the resistance of the cyclone cylinder on the premise of ensuring the separation efficiency, and the purposes of increasing the yield, reducing the consumption and optimizing the upgrade are met.
Description
Technical Field
The utility model belongs to the technical field of cement industry production, in particular to reduce preheating system of pre-heater resistance.
Background
With the national emphasis on capacity control 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 a high-temperature fan is reduced, the power consumption of the high-temperature fan can be effectively reduced, and meanwhile, the ventilation of the system and the potential digging of the capacity are facilitated. The resistance of the kiln tail preheater mainly comes from the cyclone, so that the resistance of each stage of cyclone is reduced, and resistance reduction and energy saving can be realized by matching with local transformation of the decomposing furnace and the smoke chamber.
In the existing cement production line technology, the commonly adopted resistance reduction measures include 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, increasing the inner cylinder or shortening the insertion depth of the inner cylinder, or changing the volute into a large-size cyclone cylinder, and the principles of the technology are to reduce the airflow rotation speed in the cylinder, shorten the invalid stroke of the airflow in the cylinder, reduce or avoid the collision of the inlet airflow and backflow and reduce unnecessary gas disturbance.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve the technical problem that exists among the well-known technology and provide a transformation method and preheating system that reduces pre-heater resistance, make among the cement manufacture line predecomposition system cyclone still can reduce its resistance by a wide margin under the prerequisite of guaranteeing separation efficiency, satisfy the purpose of carrying out production and reducing consumption under the condition that does not change kiln tail frame to current production line very much.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a preheating system for reducing the resistance of a preheater comprises a low-resistance non-top cyclone and a low-resistance top cyclone; 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 connecting air pipes, volute bodies, inner cylinders, upper cones and lower cones;
the connecting air pipe is connected to the inlet of the volute body; the connecting 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 connected into a whole and fixed in the volute body;
the improved volute body is a three-center equal-height variable-angle 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 three arc sections are connected with the column body in an equal-height variable-angle 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, and 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; the ratio s/a of the depth s of the inner cylinder inserted into the volute body to the height a of the airflow inlet is 0.3-0.6.
Furthermore, the ratio of the eccentricity e1 of the R2 circular arc section to the inner diameter Di of the cylinder is 0.06-0.09 of e1/Di, and the eccentricity e2/Di of the R3 circular arc section is 0-0.4 of e 2/Di.
Further, for the 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 0.1-0.3, 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.
Further, the ratio of the height H of the cyclone cylinder to the inner diameter Di of the inner cylinder is H/Di 2-5.
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 connecting air pipe is opposite to the air inlet and adopts an inclined wall to guide the air flow to enter the volute body; the inclined wall consists of two sections, and the included angle alpha between the upper inclined wall and the horizontal direction is 15-20 degrees; the angle beta between the lower inclined wall and the horizontal direction is 60-70 degrees.
Furthermore, a material scattering box is arranged on the connecting air pipe and is positioned at the position of 1.0-2.0m at the bottom of the connecting air pipe.
The utility model has the advantages and positive effects that:
the utility model can pre-judge the resistance increasing range after the output changes according to the existing condition; a proper resistance reduction scheme can be made according to the existing tower structure; the key factors of material separation efficiency and cyclone resistance reduction are found, and both electricity and coal saving can be realized. Specifically, the method comprises the following steps:
the volute body of the utility model adopts an equal-height variable-angle three-center 270-degree large volute spiral structure, the circular arcs with three different radiuses are connected more smoothly, the airflow can be led into the cyclone cylinder stably, the material reaches the cylinder wall under the action of inertia force and centrifugal force, and the improvement of the material separation efficiency and the reduction of the resistance of the cyclone cylinder are facilitated;
the spiral line of the volute adopts an equal-height variable-angle structure, and the included angle between the outer side wall of the volute connected with the cylinder 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, so that the occurrence of slope material accumulation can be effectively prevented, and the interference of collapsed materials on the air flow in the cyclone barrel is reduced;
the volute body adopts a large volute spiral structure, so that the inlet area is larger, the wind speed is lower, the eddy resistance in an inlet area is reduced, and the resistance loss is lower;
the size design of the connecting air pipe is more reasonable, the width-height ratio of the inlet is 0.4-0.6, and the ratio of the vertical sectional area F of the airflow inlet to the sectional area Fi of the cylinder is 0.2-0.4; the speed of the inlet airflow and the rotating speed of the airflow in the inner cylinder can be effectively controlled, the collision of the inlet airflow and backflow is reduced or avoided, the air inlet resistance is reduced, and the separation efficiency is improved;
the connecting air pipe is just opposite to the airflow inlet, and the smooth and stable inclined wall is adopted to guide the airflow to enter the volute body, and the structural form that the angle of the inclined wall is gradually increased from top to bottom not only plays a role in guiding the airflow, but also can ensure that the airflow at the cyclone inlet is stable, reduce the vortex and reduce the resistance.
The technical content is used for reforming the existing production line, the cyclone cylinder and the air pipe are connected in a tangent mode, the air flow is in smooth transition, negative effects on separation efficiency are not generated, the change work is small, the limitation of the existing frame is adapted, and the achieved effect is considerable.
The improvement 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 heat recovery and reduces the energy consumption of the system; the position of the material scattering box is closer to the bottom of the connecting air pipe, the heat exchange effect is better, but the material scattering box is too close to the bottom of the connecting air pipe, so that the material is easy to fall into the bottom of the next-stage connecting air pipe, and the material scattering box is improved to be located at the bottom of the connecting air pipe by 1.0-2.0 m.
Description of the drawings:
FIG. 1 is a front view of a mid-range non-top cyclone of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a front view of the mid-top cyclone of the present invention;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic view of the gas flow direction in the cyclone;
FIG. 6 is a left side view of the connecting duct;
fig. 7 is a schematic view of the position of the hopper on the connecting duct.
Wherein: 1. connecting an air pipe; 11. an airflow inlet; 12. an outer sidewall; 13. a sloped wall; 14. a material scattering box; 2. a volute housing; 21. a top cover; 22. an airflow outlet; 3. an inner barrel; 31. a tapered barrel; 4. a cylinder; 5. an upper cone; 6. a lower cone; 61. a feeding port; 7. and (4) building surfaces.
Detailed Description
The drawings in the embodiments of the present invention will be combined; the technical scheme in the embodiment of the utility model is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the present invention; rather than all embodiments. Based on the embodiment of the utility model; all other embodiments obtained by a person skilled in the art without making any inventive step; all belong to the protection scope of the utility model.
The utility model provides a reduce transformation method of pre-heater resistance mainly includes following step:
s1, collecting operation data of the preheating system and structural data of the preheater, calculating the air speeds of an air inlet, an air outlet and a connecting air pipe of the preheater, and performing initial calculation on the resistance increase amplitude after the system is improved 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 cylinder of the non-top cyclone cylinder are improved, the structures and the sizes of the volute body and the inner cylinder are changed, the wind speed at the inlet of the volute body is reduced to 13-17 m/S as far as possible, and the wind speed of a connecting air pipe is 18-24 m/S;
s3, for the top C1 cyclone, because the top of the cyclone is less limited by the frame, the original civil open hole can be used to reform the part under the floor, including changing the structure, size and relative position of the volute and the inner cylinder; the cylinder and the volute are integrally transformed into a low-resistance top cyclone;
s4, reforming the connecting air pipe, wherein the reforming comprises the steps of expanding the sectional area of the connecting air pipe, changing the shape of the connecting air pipe and increasing a necking in the middle of the connecting air pipe so as to enable the air speed of the connecting air pipe to be 16-24 m/S;
s5, the modified sprinkling box 14 is positioned at the bottom of the connecting air pipe by 1.0-2.0 m.
Wherein the regression formula in S1 is:
ΔFresistance device＝(VAfter the change/VBefore transformation)^1.5*FDecrease in the thickness of the steel
Wherein, Δ FResistance device-the increase in resistance after modification;
Vafter the changeThe inlet air speed after the modification of the connecting air pipe or the volute body;
Vbefore transformationThe air inlet speed before the modification of the connecting air pipe or the volute body;
Fdecrease in the thickness of the steelThe original resistance loss of the system, namely the difference between the resistance of the airflow inlet and the resistance of the airflow outlet.
The above regression formula is applicable to both the volute and the duct.
It should be noted that the resistance modification of the whole preheating system of the utility model includes modification of the volute body and the connecting air pipe; the resistance of the preheater mainly generates a spinning wind cylinder, the volute structure of the spinning wind cylinder is the main factor influencing the resistance, the resistance of the volute structure on the whole system accounts for about 60%, and the wind pipe accounts for about 40%.
As shown in fig. 1 to 6, the cyclones are classified into top-level cyclones and non-top-level cyclones according to positions set 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 connecting air pipes 1, volute bodies 2, inner cylinders 3, cylinders 4, upper cones 5 and lower cones 6; the last cyclone in the non-top cyclone is additionally provided with a flat-nozzle air cannon, so that the skinning blockage caused by reduction atmosphere or high-temperature material stickiness 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 airflow inlet 11; the inner cylinder 3 is a cylindrical cylinder, 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 a three-center equal-height angle-variable big volute structure formed by welding three arcs with different radiuses; the top of the volute body 2 is provided with a top cover 21; the center of the top cover 21 is provided with an airflow outlet 22; the connection between the next stage airflow outlet and the previous stage airflow inlet is realized through the connecting air pipe between the adjacent cyclones;
specifically, the volute body 2 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 body 4 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 12 connected with the cylinder 4 and the horizontal direction of the volute body 2 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 cylinder 4 is a cylindrical hollow shell, and the upper vertebral body and the lower vertebral body are sequentially connected below the cylinder 4; the outlet of the lower vertebral body is a feed opening 61; the upper cone body is a straight cone body with the diameter reduced from top to bottom, the lower cone body is a straight cone body or a skew cone body with the diameter reduced from top to bottom, the included angle between the axis of the skew cone body and the horizontal plane is 60 degrees at least, and therefore the air flow is convenient to return when the blanking is not hindered.
Preferably, a smooth and stable inclined wall 13 is adopted at the position, facing the airflow inlet 11, of the connecting air pipe 1 to guide airflow to enter the volute body 2, specifically, the inclined wall 13 consists of two sections, and an included angle alpha between the upper inclined wall 13 and the horizontal direction is 15-20 degrees; the angle beta between the lower inclined wall 13 and the horizontal direction is 60-70 degrees; the structure form that the angle of the inclined wall 13 is gradually increased from top to bottom not only plays a role of airflow guiding, but also can ensure that the airflow at the inlet of the cyclone is stable, reduce the vortex and reduce the resistance.
Preferably, for a non-top-level weak vortex cyclone: the width-to-height ratio b/a of the airflow inlet 11 is 0.3-0.6, and 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 0.2-0.5; 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 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 150 mm; the speed of the inlet airflow and the rotating speed of the airflow in the inner cylinder 3 can be effectively controlled, the collision of the inlet airflow and the backflow is reduced or avoided, the air inlet resistance is reduced, 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 0.4-0.60; 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 top-level weak vortex cyclone: the width-to-height 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 cylinder 4 is 0.1-0.3, 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 A between the position of the connecting air pipe 1 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 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 cylinder has a larger inner diameter, 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 d1/Di 0.3-0.5, and the conveying rate of the gas and the material is convenient to control. The spiral lines of the volute body 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, at the moment, the center point of the R3 arc section coincides with the center point of the R1 arc section, and the center point of the R1 arc section is located at the center of a cylinder.
The top cyclone is composed of two symmetrically arranged cyclone single bodies, and the connecting air pipes of the cyclone single bodies are arranged adjacently; the modified top cyclone cylinder and the modified connecting air pipe are connected in a tangent mode, and air flow carrying dust enters the cyclone cylinder from the air pipe in a smooth transition mode.
The utility model also discloses an operating method of above-mentioned whirlwind section of thick bamboo, its step is as follows:
the charged airflow enters the cyclone cylinder from the airflow inlet 11 of the connecting air pipe 1 in a relatively stable mode, rotates to flow downwards along the wall surface of the volute body 2, and the raw materials enter the feed opening 61 along the wall surfaces of the cylinder 4, the upper cone 5 and the lower cone 6 in sequence so as to be discharged out of the cyclone cylinder; the gas is folded back under the action of the upper cone 5 and the lower cone 6 and is discharged out of the cyclone cylinder from the airflow outlet 22 through the inner cylinder 3; the gas-solid separation of the dusty gas flow is realized.
For a series of multi-stage preheaters, the gas will enter the gas stream inlet of the next stage preheater from gas stream outlet 22.
Practice shows that the inlet wind speed V of the airflow inlet of the cyclone cylinderIntoThe influence on the resistance and the efficiency is large, and V is desirable from the viewpoint of resistance reductionIntoLower level; from the viewpoint of improving the air volume and efficiency, VIntoHigher, 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%.
In the embodiment, two 2500t/d production lines are taken as an example, the resistance of an original five-stage cyclone is high, a kiln tail preheater is subjected to resistance reduction through cyclone transformation, the transformation of a decomposing furnace is combined, the yield of the whole system is improved by 700t/d, the outlet pressure of the preheater is reduced by 900Pa, the power consumption of a firing system is reduced by 2.4kWh/t.cl, the ash return amount of an outlet of the preheater is obviously reduced, a good energy-saving and emission-reduction effect is received, and the data are shown in the following table:
TABLE 1 Pre-heater resistance reduction before and after reconstruction effect contrast
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. A preheating system for reducing resistance of a preheater is characterized in that: comprises a low-resistance non-top cyclone cylinder and a low-resistance top cyclone cylinder; 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 connecting air pipes, volute bodies, inner cylinders, upper cones and lower cones;
the connecting air pipe is connected to the inlet of the volute body; the connecting 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 connected into a whole and fixed in the volute body;
the improved volute body is a three-center equal-height variable-angle 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.
2. The preheating system of claim 1, 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.
3. The preheating system of claim 2, 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 the ratio Fi/F of the vertical sectional area Fi of the airflow inlet to the cross-sectional area F of the cylinder is 0.2-0.5; the ratio s/a of the depth s of the inner cylinder inserted into the volute body to the height a of the airflow inlet is 0.3-0.6.
4. The preheating system of claim 3, wherein: the ratio of the eccentricity e1 of the R2 circular arc section to the inner diameter Di of the cylinder is 0.06-0.09 of e1/Di, and the eccentricity e2/Di of the R3 circular arc section is 0-0.4 of e 2/Di.
5. The preheating system of claim 2, wherein: for the 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 cross sectional area F of the cylinder 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.
6. The preheating system of claim 5, wherein: the ratio of the height H of the cyclone cylinder to the inner diameter Di of the inner cylinder is 2-5.
7. The preheating system of claim 5, 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.
8. The preheating system of claim 1, wherein: the connecting air pipe is opposite to the air inlet and guides air flow into the volute casing by adopting an inclined wall; the inclined wall consists of two sections, and the included angle alpha between the upper inclined wall and the horizontal direction is 15-20 degrees; the angle beta between the lower inclined wall and the horizontal direction is 60-70 degrees.
9. The preheating system of claim 1, wherein: the connecting air pipe is provided with a material scattering box which is positioned at the position of 1.0-2.0m at the bottom of the connecting air pipe.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111111940A (en) * | 2020-02-13 | 2020-05-08 | 天津水泥工业设计研究院有限公司 | Transformation method for reducing resistance of preheater and preheating system |
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| CN111111940A (en) * | 2020-02-13 | 2020-05-08 | 天津水泥工业设计研究院有限公司 | Transformation method for reducing resistance of preheater and preheating system |
| CN111111940B (en) * | 2020-02-13 | 2024-04-30 | 天津水泥工业设计研究院有限公司 | Transformation method for reducing resistance of preheater and preheating system |
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