CN113175822B - Cement clinker pneumatic grading rotary cooling machine - Google Patents
Cement clinker pneumatic grading rotary cooling machine Download PDFInfo
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- CN113175822B CN113175822B CN202110479625.0A CN202110479625A CN113175822B CN 113175822 B CN113175822 B CN 113175822B CN 202110479625 A CN202110479625 A CN 202110479625A CN 113175822 B CN113175822 B CN 113175822B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0286—Cooling in a vertical, e.g. annular, shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0286—Cooling in a vertical, e.g. annular, shaft
- F27D2015/0293—Cooling in a vertical, e.g. annular, shaft including rotating parts
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
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Abstract
A cement clinker pneumatic grading rotary cooling machine belongs to the technical field of cement production equipment. The cement clinker pneumatic grading rotary cooler comprises: the cooling bed cover, the inner rotary bed body, the outer annular wall, the middle annular wall and the cooling air supply device; the cooling bed cover is arranged above the inner rotary bed body and the outer annular wall and is connected with the kiln head cover, and a pneumatic grading device is arranged on the cooling bed cover; the outer annular wall is connected with the cooling bed cover, the inner rotary bed body is arranged on the inner side of the outer annular wall, the middle annular wall is fixedly connected with the outer edge of the inner rotary bed body to form an inner rotary cooling bed, and an outer rotary cooling bed is formed between the middle annular wall and the outer annular wall; discharging devices are correspondingly arranged below the inner rotary cooling bed and the outer rotary cooling bed; the cooling air supply device inputs cold air into the inner rotary cooling bed and the outer rotary cooling bed through pipelines to cool clinker. The invention can carry out pneumatic classification on the cement clinker, reduces the cooling air quantity required by unit clinker through countercurrent heat exchange of solid and gas, improves the heat efficiency and realizes zero emission.
Description
Technical Field
The invention relates to a technology in the field of cement production equipment, in particular to a cement clinker pneumatic grading rotary cooler.
Background
The cement clinker cooler is an important device in cement clinker production, and is used for carrying out rapid cooling on high-temperature clinker of a rotary kiln, recovering a large amount of heat contained in the high-temperature clinker, and improving various performances of the clinker. The secondary air temperature and the tertiary air temperature are improved, the sintering heat consumption of clinker is reduced, the pollution of dust to the environment is prevented, the production cost of enterprises is reduced, and a cooler is needed for the work such as transportation and storage of the clinker.
The existing equipment for cooling cement clinker is mainly a grate cooler and a rotary cylinder cooler.
The grate cooler is characterized in that cooling air passes through the piled high-temperature clinker layers upwards from the bottom of the grate plate, solid-gas contact heat exchange is performed,realizes the quenching of the high-temperature clinker, provides secondary air and tertiary air, the air temperature can reach 900-1000 ℃, and the temperature of the clinker discharged from the cooler does not exceed the ambient temperature of +65℃. Because the cooling air flows from bottom to top and the cement clinker flows horizontally, no countercurrent heat exchange is truly formed, and the requirement is more than 1.9N.m 3 The cooling air quantity per kg.cl can reach the ambient temperature +65℃. Due to randomness of clinker particles and fluctuation of operation of process equipment, the actual cooling air quantity is more than 2.1 N.m 3 And (3) per kg/cl, a large amount of waste flue gas is required to be discharged, the thermal efficiency is reduced, the actual average thermal efficiency is 60% -70%, the quenching effect is poor, the average clinker temperature is cooled from 1400 ℃ to 900 ℃, about 4-6 minutes are required, and the time is long.
The grate cooler cooling bed has large resistance, the thickness of the material layer is usually controlled within 0.8m, the cooling efficiency is low, and the phenomena of snow stacking people and red river exist for a long time, so that the smooth operation of the kiln is influenced.
The present invention has been made to solve the above-mentioned problems occurring in the prior art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a cement clinker pneumatic grading rotary cooler which can carry out pneumatic grading on cement clinker, cool the clinker through solid-gas countercurrent heat exchange, and the temperature of secondary air and tertiary air can reach over 1150 ℃, thereby greatly reducing the cooling air quantity required by unit clinker, improving the thermal efficiency and realizing zero emission; meanwhile, the material layer resistance is reduced, the material thickness is increased, and the cooling efficiency is improved.
The invention relates to a cement clinker pneumatic grading rotary cooler which comprises a kiln hood, a cooling bed cover, a rotary cooling bed and a cooling air supply device, wherein the kiln hood and the cooling bed cover are fixed into a whole.
The cooling bed cover is arranged above the inner rotary bed body and the outer annular wall and is fixedly connected with the kiln head cover; a pneumatic grading device is arranged below the joint of the kiln head cover and the rotary kiln and used for blowing clinker falling from the kiln mouth of the rotary kiln, so that the clinker is graded according to the particle size in the rotary cooling bed and the temperature of the clinker is reduced when the clinker enters the rotary cooling bed; the classification according to the particle size means that clinker with larger particle size falls on the rotating cooling bed near the near end of one side of the pneumatic classifying device, clinker with smaller particle size falls on the rotating cooling bed far away from the far end of one side of the pneumatic classifying device, and the particle size distribution of the clinker is in a trend of decreasing from the near end to the far end. By rotating the rotating cooling bed, the particles are uniformly distributed in the same annular region.
The pneumatic classifying device comprises air injection pipes, and the air injection pipes can be provided with a plurality of rows and a plurality of rows within the width range of a material curtain of clinker descending. Accordingly, the clinker is pushed away from the lower part of the kiln mouth by utilizing the kinetic energy of air injection, and the clinker with different particle sizes is driven to fall and be distributed to different areas. By adjusting the injection angle, the injection speed and the injection air quantity of the air injection pipe, the clinker classification effect and the stacking thickness can be optimized.
Along the radial direction, the rotary cooling bed is divided into an inner rotary cooling bed and an outer rotary cooling bed, the inner rotary cooling bed and the outer rotary cooling bed are coaxially and synchronously arranged in 360 degrees in a rotating way, the bed surfaces of the inner rotary cooling bed and the outer rotary cooling bed are annular, in particular circular, and meanwhile, the outer rotary cooling bed can be divided into an upper layer and a lower layer.
The inner rotary cooling bed comprises an inner rotary bed body and an intermediate ring wall arranged along the outer edge of the inner rotary bed body; the inner rotary cooling bed can be divided into a plurality of polygonal cooling bins through radial and/or annular partition plates, the bin bottoms of the polygonal cooling bins are connected with an inner discharging device, and the cooling air supply device is communicated with the inner discharging device so as to be filled with cooling air to cool clinker. Preferably, the inner rotary bed body comprises a plurality of annular grids coaxially arranged, the annular grid positioned at the innermost side is connected with the outer edge of an inner annular wall cover, and the inner annular wall cover is used for blocking clinker; a material dropping groove is arranged between two adjacent annular grids and is communicated with the inner discharging device.
The outer rotary cooling bed comprises an outer annular wall which is coaxially arranged with the middle annular wall, the outer annular wall is used as the outer wall of the outer rotary cooling bed, and the middle annular wall is used as the inner wall of the outer rotary cooling bed; the outer annular wall is arranged corresponding to the outer edge of the cooling bed cover, and gaps are reserved between the outer edge of the cooling bed cover and the outer annular wall in the up-down direction and are sealed through the sliding blocks. The upper layer of the outer rotary cooling bed can be divided into a plurality of polygonal cooling bins through radial partition plates, the polygonal cooling bins take grids and roller crusher rollers as bin bottoms, and the grids are preferably obliquely arranged towards the roller direction; the lower layer of the outer rotary cooling bed comprises a pair of grid plate cooling walls which are oppositely arranged and provided with intervals; and corresponding to the grid plate cooling wall, the lower layer of the rotary cooling bed is communicated with the cooling air supply device so as to be filled with cooling air to cool clinker at the lower layer and the upper layer of the outer rotary cooling bed. The lower layer of the outer rotary cooling bed is communicated with an outer discharging device at the bottom.
For the cooling air supply device, a plurality of groups of rotary air supply pipelines are preferably arranged according to the particle size of clinker in the annular region after the classification of the clinker; the rotary air supply pipeline is arranged at the bottom of the inner rotary bed body and rotates along with the inner rotary bed body; the cooling air quantity in different groups of rotary air supply pipelines is different, so that the classified clinker and the thickness of the clinker layer are respectively cooled according to the requirements; the cooling air supply device is provided with a fixed pipeline, and the rotary air supply pipeline is in butt joint with the fixed pipeline through a fixed pipeline interface; the fixed pipeline and the rotary air supply pipeline are sealed by liquid, so that air introduced by the fixed pipeline is prevented from flowing out through an assembly gap between the rotary air supply pipeline and the fixed pipeline, and further, clinker in the outer rotary cooling bed and the inner rotary cooling bed cannot obtain enough cooling air quantity. It is further preferred that a set of rotary air supply ducts is provided for the outer rotary cooling bed and at least one set of rotary air supply ducts is provided for the inner rotary cooling bed.
Technical effects
Compared with the prior art, the invention has the following technical effects:
1) The clinker classification is realized by high-speed air rushing into the high-temperature clinker curtain just coming out of the kiln, and the design of the inner rotary cooling bed and the outer rotary cooling bed is combined, so that the clinker in the same annular region has similar particle size, the porosity is increased, the air resistance is reduced, and the cooling efficiency is improved;
2) The pneumatic grading device realizes the grading of the clinker, and simultaneously takes away a part of heat of the clinker by the sprayed cooling air, so that part of fused clinker is quickly solidified, the phenomenon that the clinker is piled on a cooling bed by snowman is eliminated, and a series of losses caused by the failure of a cooling machine are avoided;
3) The clinker vertical flow and the material gas countercurrent cooling mode are adopted, the secondary air temperature and the tertiary air temperature are improved on the basis of clinker classification, the temperature can reach more than 1150 ℃, the thermal efficiency is more than 92%, and the energy can be saved by 8-10%;
4) Greatly reduces the cooling air quantity of unit clinker, and the cooling air quantity required for cooling each kilogram of clinker is less than 0.9N.m 3 Zero emission can be realized.
Drawings
FIG. 1 is a schematic cross-sectional structure of embodiment 1;
FIG. 2 is a cross-sectional view of an upper outer cooling gallery and a lower outer cooling gallery in the direction A-A of FIG. 1;
FIG. 3 is an enlarged view of the portion I of FIG. 1;
FIG. 4 is a schematic view of the B-B direction in FIG. 3;
in the figure:
a cooling bed cover 10;
an inner annular wall cover 21; middle annular wall 22, clearance hole 221; an outer annular wall 23; an annular rail 241, a connection shaft 242; side grids 251, top plate 252; a slider 26; an inner first cooling bin 271, an inner second cooling bin 272, an inner discharge hopper 273, a discharge chute 274, an air chute 275; an upper outer cooling bin 291, a grille 292, a roller crusher roller 293, a lower outer cooling bin 294, a grid plate cooling wall 295, an outer discharge hopper 296, an air guide slit 297, an air guide hole 298 and a blanking baffle 299;
a kiln head hood 30; a top baffle 301, a bottom baffle 302, and side baffles 303;
a tertiary air duct 40;
a rotary kiln 50;
a pneumatic classifier 60, an air jet pipe 61;
a lock air discharge valve 70;
an outer rotary air supply duct 811, an inner first rotary air supply duct 813, and an inner second rotary air supply duct 814; the tubing 82 is secured and the fluid is sealed 84.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Example 1
This example illustrates a cement clinker production line with a capacity of 5000t/d, which uses a cement clinker pneumatic classifying rotary cooler for cooling treatment. The cement clinker pneumatic grading rotary cooler in the embodiment comprises: the cooling bed cover 10, the inner annular wall cover 21, the middle annular wall 22, the outer annular wall 23, and the cooling air supply device are shown in fig. 1 and 2.
The cooling bed cover 10 is arranged above the inner annular wall cover 21 and the outer annular wall 23, and the kiln head cover 30 is arranged above the cooling bed cover 10 and fixedly connected with the cooling bed cover 10; a tertiary air pipe 40 is arranged on the kiln head cover 30 above the joint of the kiln head cover 30 and the rotary kiln 50; the cooling bed cover 10 is provided with a pneumatic grading device 60 below the joint of the kiln head cover 30 and the rotary kiln 50, the pneumatic grading device 60 is used for blowing clinker falling from the kiln mouth of the rotary kiln, the clinker has different particle sizes and different weights, and under the blowing of air flow, the clinker with large particle size falls close, and the clinker with small particle size is pushed far away, so that the clinker is graded according to the particle size.
The use of the pneumatic classification device may cause the small-particle-size clinker to float and not be easy to collect, for this purpose, a top baffle 301 and a bottom baffle 302 are arranged on the kiln hood on the opposite side of the pneumatic classification device 60, and a side baffle 303 is fixed between the top baffle 301 and the bottom baffle 302, so as to form a material blocking and guiding structure, and the scattered small-particle-size clinker can gather and slide downwards.
The air classifier 60 comprises air injection pipes 61, which can be arranged in a plurality of rows and a plurality of rows within the width of the material curtain downstream of the kiln clinker. In this embodiment, preferably, two rows of 5 are provided, and 10 are provided; the nozzle of the air jet pipe is flat, and the cross section area is 2000-4000 mm 2 The jet of the air jet pipe is aligned with the rotation axis of the inner annular wall cover, the jet angle is 45 DEG elevation angle, the jet speed is 80-130 m/s, the jet air quantity is 3-6% of the clinker cooling air quantity, and the total quantity of the 10 air jet pipes placed into the jet air is 0.027-0.054N.m 3 /kg.cl。
The high-speed air sprayed from the air spraying pipe is sprayed into the material curtain, the cooling air is contacted with the high-temperature clinker with high dispersion temperature above 1400 ℃, the average temperature difference of heat exchange is not less than 750 ℃, the huge temperature difference can instantly heat the air to not less than 1200 ℃, meanwhile, the sprayed air accounting for 3% -6% of the clinker cooling air quantity takes away part of heat of the clinker, the average temperature of the clinker can be reduced by 30-60 ℃, and the rapid cooling effect of the clinker is realized. In the process, the clinker with small particle size has larger cooling amplitude which can reach more than 100 ℃, and the cooling amplitude of the clinker with large particle size is small; the cooling can enable part of clinker in a molten state to be immediately solidified, and the possibility of 'snow stacking people' phenomenon after the clinker falls is eliminated.
The outer annular wall 23 and the middle annular wall 22 are driven by a driving device to rotate along two concentric annular tracks 241, the rotation speed is controlled to be 0.5-1.5 revolutions per minute, and the distribution uniformity of blanking and stacking is ensured; as a preferred mode, a combination of rollers and a track rotating device is adopted, the outer annular wall 23 and the middle annular wall 22 are provided with rollers, a driving device is fixed on the outer annular wall and is in transmission connection with the rollers, and the rollers of the outer annular wall 23 and the middle annular wall 22 are connected through a connecting shaft 242; a horizontal seam of 30-50 mm is reserved between the outer annular wall 23 and the kiln head cover 30 as well as between the outer annular wall and the cooling bed cover 10, and the horizontal seam is connected in a sealing way by adopting a sliding block 26, so that stable rotation is ensured, and meanwhile, the horizontal seam has good sealing performance.
The inner annular wall cover 21 is arranged on the inner side of the outer annular wall, and a plurality of annular grids 292 are arranged between the inner annular wall cover 21 and the middle annular wall 22 to form an inner rotary bed body serving as an inner rotary cooling bed; a material dropping groove is arranged between adjacent annular grids 292 on the inner rotary cooling bed; the inner annular wall cover 21 is convex and protrudes towards one side of the cooling bed cover and is used for blocking clinker, so that the clinker is ensured not to fly around and be in a preset area; the inner rotary cooling bed is provided with a radial partition plate, and is divided into a plurality of inner cooling bins; in this embodiment, the clinker particle size on the internal rotating cooling bed may be divided into one stage, two stages or three stages, taking two stages as an example, by providing a circumferential partition plate, the internal cooling bin is radially divided into an internal first cooling bin 271 and an internal second cooling bin 272, preferably, further by providing a radial partition plate, so that the number of the internal first cooling bin and the number of the internal second cooling bin are 10; the inner first cooling bin and the inner second cooling bin are provided with an inner discharge hopper 273 at the bottom; the inner discharging hopper is internally provided with a discharging groove 274 and an air groove 275, the discharging groove is used as the center, the air groove is arranged at the upper part of the inner discharging hopper and surrounds the discharging groove, the side wall of the inner discharging hopper is provided with an air guide slit 297 for guiding cooling air into the air groove, and the cooling air guided by the air guide slit 297 is conveyed to all parts of the air groove 275 through an air guide hole 298; as shown in fig. 3 and 4; the bottom of the inner discharging hopper is provided with a locking air discharging valve 70, which adjusts the cooling temperature of the clinker and controls the clinker discharging flow.
An outer rotary cooling bed is formed between the middle annular wall 22 and the outer annular wall 23, 10 radial partition plates are arranged in the outer rotary cooling bed, and the outer rotary cooling bed is divided into 10 upper layer outer cooling bins 291; a grid 292 and a roller crusher roller 293 are arranged in the upper layer outer cooling bin 291, and the roller crusher roller adopts a pair of rollers; on one hand, the thickness of the material layer in the upper layer outer cooling bin causes pressure on the machine roller, and the rotation of the machine roller is influenced; on the other hand, the hardness of clinker particles and the wedge force caused by the material layer on the machine roller influence the rotation of the machine roller; the pair of rollers are arranged at a certain included angle with the horizontal plane, namely, a plane formed by two axes of the pair of rollers forms a certain included angle with the horizontal plane; if the included angle is set to be 60 degrees, the wedge force at the moment is 20-40% of that of the non-included angle, and the power required by the running of the roller crusher is greatly reduced.
The outer rotary cooling bed is provided with a lower outer cooling bin 294 at the bottom of the upper outer cooling bin 291, and clinker in the upper outer cooling bin 291 falls into the lower outer cooling bin 294 after being crushed by a roller crusher roller; two grid plate cooling walls 295 are arranged in the lower outer cooling bin 294, and the wall surface is ventilated and is not leaked; an air cavity is arranged between the two grid plate cooling walls 295, the air cavity comprises two side grid plates 251 and a top plate 252 fixed at the tops of the two side grid plates, the top plate is used for preventing clinker from falling into the air cavity, the air cavity is used for cooling air provided by the air supply device to flow in so as to cool the clinker in the lower outer cooling bin sufficiently in time, and then the cooling air can enter the upper outer cooling bin to cool the clinker; the area of the grid plate cooling wall 295 is generally not smaller than 40% of the bottom area of the lower layer external cooling bin 294, and the thickness is set to be about 0.3 m; the grid plates in the grid plate cooling wall 295 incline inwards and form an included angle of 45-60 degrees with the horizontal plane, and the width of the grid plates is 1.2-1.5 times of the interval; the clinker between the two grid plate cooling walls is crushed by a roller crusher, the grain diameter is not more than 25mm, the thickness of the material layer is consistent, the porosity change is small, the wind speed is uniform, and the further cooling of the clinker is facilitated. The clinker is cooled from 300-350 ℃ to the ambient temperature +65 ℃ and the required time is only 4-6 minutes.
The lower external cooling bin 294 is fixedly provided with a blanking baffle 299 at the bottom of the grid plate cooling wall 295, so that the clinker in the lower external cooling bin can conveniently flow downwards and the clinker falling from the grid 292 of the upper external cooling bin 291 can conveniently flow downwards along with the clinker in the lower external cooling bin 294, the contact area between the grid plate cooling wall 295 and cooling air is prevented from being reduced due to accumulation of the clinker in the lower external cooling bin 294, and the heat exchange capacity of the clinker and the cooling air is reduced; the bottom of the lower outer cooling bin 294 is connected with an outer discharge hopper 296, and the bottom of the outer discharge hopper 296 is provided with a locking air discharge valve 70 for adjusting the cooling temperature of clinker and controlling the clinker discharge flow.
The clinker classification enables the particle sizes of the clinker in the same annular region to be similar, and the stacking porosity is increased, so that the material layer resistance is reduced. Tests show that under the condition that the grain diameter of clinker is larger than 20mm, the material layer resistance is only 1/8-1/6 of the grain diameter clinker of 5-10 mm. The allowable thickness of the coarse-grain clinker layer is greatly increased under the same wind pressure. Therefore, when the average thickness of the material layer in the inner rotary cooling bed is controlled to be about 0.8m, the embodiment can control the average thickness of the material layer in the outer rotary cooling bed to be about 2m, and finally the weight of the clinker discharged through the outer rotary cooling bed is controlled to be about 50% of the total weight of the clinker.
Clinker falling from the kiln mouth of the rotary kiln sometimes clamps large clinker and kiln shells, and the diameter can reach 1m at maximum, so that the maximum radial width of the external rotary cooling bed is more than 1m, preferably about 1.1 m. Meanwhile, in order to solve the problem that the large kiln slabs are difficult to crush, barrier removing holes 221 are formed in the outer annular wall 23 at the position 300-400 mm above the top of the grid, and when the large kiln slabs are encountered, equipment such as rock drilling and the like can send a drill tool and the like into an outer rotary cooling bed through the barrier removing holes to crush the large kiln slabs, so that smooth operation of the roller crusher is ensured.
The cooling air supply device adopts a low-pressure fan, the provided full air pressure is about 12000Pa, and the air cavity in the lower layer outer cooling bin 294 and the air groove 275 in the inner unloading device are respectively communicated through pipelines and used for supplying air to the classified clinker for cooling.
For the cooling air supply device, a plurality of groups of rotary air supply pipelines are preferably arranged according to the particle size of clinker in the annular region after the clinker is classified, and the rotary air supply pipelines are fixedly connected with the middle annular wall through a spoke wheel type bracket and rotate along with the middle annular wall; the cooling air quantity in different groups of rotary air supply pipelines is different, so that the classified clinker is cooled respectively according to the requirement; the cooling air supply device is provided with a fixed pipeline 82, and the rotary air supply pipeline is in butt joint with the fixed pipeline 82 through a fixed pipeline interface; the liquid seal 84 prevents the air introduced by the fixed duct from flowing out through the assembly gap between the rotary air supply duct and the fixed duct interface, thereby resulting in insufficient cooling air volume for clinker in the outer rotary cooling bed and the inner rotary cooling bed. Further preferably, a set of external rotary air supply pipes 811 are provided for the external rotary cooling bed, the external rotary air supply pipes being in butt joint with the air chamber; for the inner rotating cooling bed, at least one set of inner rotating air supply ducts is provided, and in this embodiment, a set of inner first rotating air supply ducts 813 and a set of inner second rotating air supply ducts 814 are provided in the inner rotating cooling bed.
When the embodiment works, through setting working parameters of the pneumatic classifier, clinker with the particle size of below 25mm can fall into the inner rotary cooling bed, and clinker with the particle size of above 20mm can fall into the outer rotary cooling bed;
when the average thickness of the material layer in the inner rotary cooling bed is about 0.8m and the average thickness of the material layer in the outer rotary cooling bed is about 2m, opening a roller crusher and a locking air discharge valve, crushing large clinker in the outer rotary cooling bed by the roller crusher, controlling clinker in the outer rotary cooling bed and the inner rotary cooling bed to be discharged by the locking air discharge valve, and controlling the discharging amount in the outer rotary cooling bed and the inner rotary cooling bed to be balanced with the discharging amount in a corresponding area, so that the system resistance is in an optimal state, and the cooling efficiency is improved;
in the process, cooling air is continuously input through a cooling air supply device according to the air quantity required by a kiln firing system, and the total air pressure is controlled to be about 12000 Pa; cooling air a and b enters corresponding through fixed pipelinesIn the rotary air supply pipeline, cooling air a enters an outer cooling bin of the lower layer to cool clinker, and the cooling air a cools clinker in an outer rotary cooling bed until the temperature of the clinker at a roller of the roller crusher is below 350 ℃, preferably 300 ℃, so that the roller of the roller crusher works at a lower temperature, and the service life of the roller crusher is ensured; cooling air b is divided into cooling air b1 and cooling air b2, and the cooling air b enters an inner first cooling bin and an inner second cooling bin respectively to cool clinker; after cooling and heat exchanging, the air escapes from the top of the material layer, the air temperature of the secondary air can reach over 1150 ℃, and the required cooling air quantity is less than 0.9N.m 3 /kg.cl。
The thermal efficiency of the embodiment is more than 92%, the daily cooling clinker quantity of each square meter of cooling bed can reach 60-80 t, the cooling waste gas can be completely fed into the kiln, zero emission is realized, energy can be saved by 8-10%, and the emission of carbon dioxide is greatly reduced.
The above embodiments are merely preferred embodiments of the present invention, and the present invention is not limited in any way, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A cement clinker pneumatic classifying rotary cooler, comprising: the cooling bed cover, the inner rotary bed body, the outer annular wall, the middle annular wall and the cooling air supply device;
the cooling bed cover is arranged above the inner rotary bed body and the outer annular wall and is fixedly connected with the kiln head cover; the cooling bed cover is provided with a pneumatic grading device below the joint of the kiln head cover and the rotary kiln, the pneumatic grading device is used for blowing clinker falling from the kiln mouth of the rotary kiln so as to grade the clinker according to the particle size, and the pneumatic grading device comprises air injection pipes which are arranged in a plurality of rows within the width range of a material curtain of the clinker at the kiln mouth;
horizontal slits are reserved between the outer annular wall and the kiln head cover as well as between the outer annular wall and the cooling bed cover, the inner rotary bed body is arranged on the inner side of the outer annular wall by adopting sliding blocks for sealing connection, and the middle annular wall is fixedly connected with the outer edge of the inner rotary bed body to form an inner rotary cooling bed; the bottom of the inner rotary bed body is provided with a plurality of inner discharging devices along the radial direction;
a grid is arranged between the middle annular wall and the outer annular wall along the circumferential direction, the outer annular wall and the middle annular wall rotate along two concentric annular tracks and are coaxially and rotatably arranged to form an outer rotary cooling bed; the outer rotary cooling bed is internally provided with a roller crusher roller, and the bottom of the outer rotary cooling bed is provided with an outer discharging device; the outer rotary cooling bed is divided into a plurality of upper outer cooling bins, a lower outer cooling bin is arranged at the bottom of the upper outer cooling bin, and clinker in the upper outer cooling bin falls into the lower outer cooling bin after being crushed by a roller of a roller crusher; two grid plate cooling walls which are oppositely arranged are arranged in the lower layer outer cooling bin, an air cavity is arranged between the grid plate cooling walls, and the air cavity comprises grid plates at two sides and a top plate fixed at the tops of the grid plates at two sides;
the cooling air supply device inputs cold air into the inner rotary cooling bed and the outer rotary cooling bed through pipelines to cool clinker, wherein the lower layer of the outer rotary cooling bed is communicated with the cooling air supply device to be introduced with cooling air to cool clinker on the lower layer and the upper layer of the outer rotary cooling bed.
2. The cement clinker pneumatic classifying rotary cooler according to claim 1, wherein the air injection pipe has an injection angle of less than 50 ° and an injection speed of less than 150m/s, and the injection air quantity is not more than 10% of the clinker cooling air quantity.
3. The cement clinker pneumatic classifying rotary cooler according to claim 1, wherein a top baffle and a bottom baffle are arranged on the kiln head cover at the opposite side of the pneumatic classifying device, and two side baffles are fixed between the top baffle and the bottom baffle.
4. The cement clinker pneumatic classifying rotary cooler according to claim 1, wherein the inner rotary bed body comprises a plurality of annular gratings which are coaxially arranged, the annular grating positioned at the innermost side is connected with the outer edge of an inner annular wall cover, and the inner annular wall cover is used for blocking clinker; a material dropping groove is arranged between two adjacent annular grids and is communicated with the inner discharging device.
5. The cement clinker pneumatic classification rotary cooler according to claim 1, wherein a plurality of partition plates are arranged on the internal rotary cooling bed to divide the internal rotary cooling bed into a plurality of internal cooling bins; the inner cooling bin is communicated with the inner discharging device.
6. The cement clinker pneumatic classifying rotary cooler of claim 5, wherein the partition comprises a radial partition and/or a circumferential partition.
7. The cement clinker pneumatic classifying rotary cooler according to claim 5, wherein the inner discharging means is provided with a discharging groove and an air groove, the air groove being provided around the discharging groove at an upper portion of the inner discharging hopper with the discharging groove as a center.
8. The cement clinker pneumatic classifying rotary cooler according to claim 1, wherein the upper layer outer cooling bin is provided with a grid and a roller crusher roller, and the roller crusher roller adopts a pair of rollers.
9. The cement clinker pneumatic classifying rotary cooler according to claim 8, wherein the planes formed by the two axes of the pair of rollers are arranged at an angle to the horizontal plane.
10. The cement clinker pneumatic grading rotary cooler according to claim 1, wherein the cooling air supply device comprises a fixed pipeline, a fixed pipeline interface and a plurality of groups of rotary air supply pipelines, the rotary air supply pipelines are arranged at the bottom of the inner rotary bed body and rotate along with the inner rotary bed body, and the rotary air supply pipelines are in butt joint with the fixed pipeline through the interfaces on the fixed pipeline; the fixed pipeline and the rotary air supply pipeline are sealed by liquid; a group of rotary air supply pipelines are arranged for the outer rotary cooling bed and are in butt joint with the lower outer cooling bin; at least one group of rotary air supply pipelines are arranged for the internal rotary cooling bed and are in butt joint with the internal cooling bin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110479625.0A CN113175822B (en) | 2021-04-30 | 2021-04-30 | Cement clinker pneumatic grading rotary cooling machine |
Applications Claiming Priority (1)
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