CN212237517U - Coal pulverizer with wind powder homogenization function - Google Patents

Abstract

The utility model discloses a coal pulverizer with wind powder homogenization function, coal pulverizer utilize the buggy pipeline to link to each other with the boiler, include: the coal pulverizer comprises a coal pulverizer shell, wherein the top of the coal pulverizer shell is connected with a pulverized coal pipeline, and a primary air pipe is also arranged on the side wall of the bottom of the coal pulverizer shell; the material powder conveying assembly is communicated with the coal mill shell; the material powder grinding assembly is rotatably connected to the bottom of the coal mill shell; the powder homogenizing assembly comprises a driving mechanism and a homogenizing rotor, the driving mechanism drives the homogenizing rotor to rotatably sleeve the powder conveying assembly, and an air inlet and an air outlet are formed in the bottom and the side wall of the homogenizing rotor respectively; and one end of the central air inlet assembly is communicated with the primary air pipe, and the other end of the central air inlet assembly is inserted into the shell of the coal mill and communicated with the material powder conveying assembly. This coal pulverizer structural design is reasonable, and the wind powder homogenization is effectual, has effectively reduced the wind powder deviation in the buggy pipeline, has improved the combustion efficiency and the security of boiler.

Description

Coal pulverizer with wind powder homogenization function

Technical Field

The utility model relates to a powder process technical field that mills, specific saying so relates to a coal pulverizer with wind powder homogenization function.

Background

The existing coal mill and a plurality of coal powder pipelines connected with the existing coal mill form a powder making system which is responsible for grinding raw coal into coal powder with qualified fineness and conveying the coal powder to a boiler for combustion. The primary air and the raw coal enter the coal mill simultaneously, the primary air carries the ground coal powder in the coal mill and enters the coal powder separator, and after coarse and fine powder separation, the primary air continues to carry the coal powder to enter the coal powder pipeline until the coal powder enters the boiler. In order to improve the combustion efficiency of the boiler and the operation safety of the boiler, the fineness of the pulverized coal in each pulverized coal pipeline, the concentration of the pulverized coal and the flow rate of the pulverized coal are required to be consistent as much as possible.

However, a large amount of actual measurement data shows that the deviation of air and powder in a coal powder pipeline of the existing pulverizing system is large, wherein the deviation of coal powder quantity, the deviation of coal powder fineness and the deviation of coal powder concentration are large, the deviation is more than +/-30 percent and is common, and some deviation even exceeds +/-50 percent. Boiler coking, pipe explosion, uneven temperature field, high fly ash carbon content, large NOx generation amount and the like are directly related to air-powder deviation, so that air-powder homogenization of a powder preparation system is of great importance to improving the economical efficiency and safety of boiler operation.

The working principle of the HP coal mill is as follows: raw coal enters the coal mill from the coal dropping pipe, falls on the rotating grinding bowl, and is gradually diffused to the edge of the grinding bowl under the action of centrifugal force. 3 grinding rollers are uniformly arranged on the grinding bowl along the circumferential direction, and when raw coal is diffused to the grinding roller area, the grinding rollers grind the raw coal. The raw coal continuously diffuses to the edge of the grinding bowl, after overflowing from the edge of the grinding bowl, meets primary air blown from the air ring, the primary air blows large-particle raw coal back to the grinding bowl for grinding again, and the residual coal powder is carried to the region of the separator. The separator is used for separating coarse coal powder from fine coal powder, unqualified coarse coal powder is returned to the grinding bowl for grinding again, and primary air carrying the qualified coal powder enters the coal powder outlet pipe and is conveyed to the boiler.

Analysis shows that the uneven wind powder in the coal mill mainly has several reasons:

1) uneven primary air inlet grinding

The coal mill is provided with only one primary air inlet which is positioned at one side of the primary air chamber, and primary air horizontally enters the primary air chamber and then vertically upwards enters the coal mill through the movable air ring. The movable air ring has the function of enabling primary air to enter the mill uniformly along the edge of the milling bowl, but due to the inertia effect, the wind speed entering the mill close to the primary air inlet is far smaller than the wind speed opposite to the primary air inlet. The larger the wind speed is, the stronger the capability of carrying pulverized coal is, and the uneven grinding of primary wind causes uneven fineness and concentration of the pulverized coal carried along the circumference of the grinding bowl.

2) Uneven overflow of raw coal from grinding bowl

The grinding bowl is provided with three grinding rollers which are uniformly distributed, the grinding bowl rotates clockwise, when raw coal reaches the front area of the roller along with the rotation of the grinding bowl, the thickness of the pulverized coal in the front area of the roller is increased due to the blocking of the grinding rollers, and meanwhile, the thickness of the pulverized coal in the rear area of the roller is reduced due to the rolling action of the grinding rollers, so that the raw coal is overflowed in the front areas of the three rollers in a concentrated mode, and the raw coal is not overflowed uniformly along the edge of. Therefore, three areas in the wind ring area have high coal dust concentration, and three areas have low coal dust concentration and are distributed at intervals. Even if the area with high coal powder concentration and the area with low coal powder concentration are fused together due to diffusion in the process of conveying coal powder to the coal powder outlet of the coal mill, the phenomenon of uneven coal powder concentration corresponding to the lower condition still exists at the coal powder outlet of the coal mill.

3) The homogenization effect of the flow field in the mill on the pulverized coal is not good

The distance from the air ring area of the coal mill to the pulverized coal outlet is short, and the through-flow section is simple, so that the mixing and homogenization of air and powder are not facilitated. Taking an HP1003 coal mill as an example, the distance from the wind ring area to the coal powder outlet is less than 4.3m, the speed of primary wind in the vertical direction in the mill is about 10m/s, and the coal powder is conveyed to the coal powder outlet from the wind ring in the time of less than 0.5 s. On the other hand, the conventional dynamic separator uses a bottom-sealed rotor, and the air-powder mixture must enter the rotor from the outside of the rotor, and an annular region between the rotor and the separator housing is located upstream of the rotor, so that the rotation of the rotor does not disturb the region, i.e., homogenize the air-powder mixture in the region.

The analysis shows that when the primary air carries the coal powder to move in the coal mill, the retention time in the coal mill is short, the movement path is simple, and therefore the air powder cannot be fully mixed. The air-powder mixture has a large deviation in the fineness and concentration of the pulverized coal, which still exists when entering the pulverized coal outlet pipe.

Therefore, it is an urgent need to solve the problem of the technical staff in the art to provide a coal mill with a wind powder homogenizing function, which has a reasonable structural design and a good wind powder homogenizing effect.

Disclosure of Invention

In view of this, go into to grind inhomogeneous, raw coal from the grinding bowl and spill over inhomogeneous and grind the interior flow field and lead to the inside wind powder homogenization effect subalternation technical problem of coal pulverizer poor to the homogenization effect of buggy in order to solve among the prior art coal pulverizer inside because of once wind, the utility model provides a structural design is reasonable, the effectual coal pulverizer that has wind powder homogenization function of wind powder homogenization.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a coal pulverizer with air-powder homogenizing function, which is connected with a boiler by a pulverized coal pipeline, comprising:

the coal pulverizer comprises a coal pulverizer shell, wherein a discharge hole is formed in the top of the coal pulverizer shell, one end of a pulverized coal pipeline is communicated with the discharge hole, and a primary air pipe communicated with the coal pulverizer shell is further arranged on the side wall of the bottom of the coal pulverizer shell;

the material powder conveying assembly penetrates through the center of the top of the coal mill shell, is inserted into the coal mill shell and is communicated with the coal mill shell;

the powder grinding assembly is rotatably connected to the bottom of the coal mill shell and is arranged opposite to the powder conveying assembly;

the material powder homogenizing assembly comprises a driving mechanism and a homogenizing rotor, the driving mechanism is arranged at the top of the coal mill shell, the homogenizing rotor is arranged in the coal mill shell and is opposite to the material powder grinding assembly, the driving mechanism drives the homogenizing rotor to be rotatably sleeved on the material powder conveying assembly, and an air inlet and an air outlet are formed in the bottom and the side wall of the homogenizing rotor respectively;

and one end of the central air inlet assembly is communicated with the primary air pipe, and the other end of the central air inlet assembly is an air outlet end which is bent and inserted into the coal mill shell and communicated with the material powder conveying assembly.

According to the technical scheme, compared with the prior art, the utility model discloses a coal mill with wind powder homogenization function, through utilizing the material powder grinding component arranged opposite to the material powder conveying component, the material powder can be fully ground, and the particle size of the material powder is reduced; part of primary air can directly enter the material powder conveying assembly by utilizing the central air inlet assembly, and part of the primary air is blown to the center of the material powder grinding assembly through the material powder conveying assembly, so that the condition of uneven grinding of the primary air is improved, and the problem of uneven wind powder caused by uneven grinding of the primary air is weakened; the air-powder mixture in the shell of the coal mill can be homogenized by the homogenizing rotor, and the homogenized air-powder mixture enters an annular area between the homogenizing rotor and the shell of the coal mill, so that the air-powder mixture is further homogenized, and the air-powder mixture achieves the effect of fully mixing and homogenizing. The utility model discloses a coal pulverizer structural design with wind powder homogenization function is reasonable, when carrying out thickness separation to the buggy, can also carry out homogenization treatment to the wind powder mixture, and wind powder homogenization is effectual, has effectively reduced the wind powder deviation in the buggy pipeline, has improved the combustion efficiency of boiler and the security of operation, has good application prospect.

Furthermore, the powder conveying component is a coal dropping pipe, the number of the discharge holes is multiple, and the discharge holes are uniformly distributed on the periphery of the coal dropping pipe.

The beneficial effects that adopt above-mentioned technical scheme to produce are for this coal pulverizer compact structure nature is strong, is convenient for make the wind powder mixture after the homogenization get into the boiler through a plurality of discharge gates and pulverized coal pipeline, improves the combustion efficiency and the operation security of boiler.

Furthermore, the central air inlet assembly comprises an air inlet pipe, an air sleeve and a regulating valve, wherein one end of the air inlet pipe is communicated with the primary air pipe, and the other end of the air inlet pipe is communicated with the side wall of the air sleeve to form a whole; the air sleeve and one end of the air inlet pipe are bent and inserted into the shell of the coal mill, and the air sleeve is sleeved and fixed at the lower end of the coal dropping pipe; the regulating valve is arranged on the air inlet pipe.

The beneficial effects that adopt above-mentioned technical scheme to produce are that, utilize the air-supply line to make partly once wind directly get into the coal pulverizer center, blow partly once wind to the material powder grinding assembly center through the wind cover, improved once wind and gone into the inhomogeneous situation of grinding, weakened because once wind goes into the inhomogeneous wind powder uneven problem that causes of grinding, utilize the governing valve can be according to actual operation condition, adjust the air volume.

Furthermore, the central air inlet assembly further comprises a wear-resistant guard plate, the section of the wear-resistant guard plate is semicircular, the wear-resistant guard plate is fixed to the bottom of the other end of the air inlet pipe and corresponds to the position of the air flowing direction in the shell of the coal mill.

The air inlet pipe has the beneficial effects that the air flow formed when the air-powder mixture moves from bottom to top erodes and wears the bottom of the air inlet pipe seriously, and the wear-resistant guard plate can play a role in protecting the air inlet pipe.

Further, the wear-resistant guard plate is made of wear-resistant materials, such as wear-resistant steel plates.

Further, the thickness of the wear-resistant guard plate is more than 20 mm.

The beneficial effect that adopts above-mentioned technical scheme to produce is, can effectively protect the air-supply line other end, extension air-supply line life.

Further, the powder grinding assembly comprises a grinding disc mechanism, a grinding roller mechanism and a spring loading mechanism, the grinding disc mechanism is rotatably connected to the bottom of the coal grinding machine shell and is arranged opposite to the homogenizing rotor, one end of the grinding roller mechanism is fixed to the side wall of the coal grinding machine shell through a limiting rod, the other end of the grinding roller mechanism is abutted to the top of the grinding disc mechanism, and one end of the spring loading mechanism is inserted into the side wall of the coal grinding machine shell and is abutted to the side wall of the coal grinding machine shell.

The coal mill has the advantages that the whole structure is reasonable in design, the connecting structure between the grinding roller mechanism and the grinding disc mechanism can be used for fully grinding the material powder, and the particle size of the material powder is reduced.

Furthermore, the grinding roller mechanisms and the spring loading mechanisms are three, the three grinding roller mechanisms are uniformly arranged at the top of the grinding disc mechanism, and the three spring loading mechanisms are respectively abutted against the corresponding three grinding roller mechanisms.

The coal pulverizer has the beneficial effects that the pulverized coal grinding efficiency can be further improved.

Further, the homogenizing rotor comprises a central pipe, a cone, blades, a bottom ring and a choke block, and the driving mechanism drives the central pipe to be rotatably sleeved on the coal dropping pipe; the cone comprises an upper plate and a lower plate, the upper plate is a circular table top with a hole in the middle, the lower plate is an inverted circular table top with a hole in the middle, the opposite side edges of the upper plate and the lower plate are fixedly connected, and the upper plate and the lower plate are fixedly sleeved on the outer side of the central tube; the air inlet is arranged in the middle of the bottom ring, a plurality of air outlets are formed between the plurality of blades and the lower plate and between the plurality of blades and the bottom ring, and the air blocking block is fixed at the air outlet and used for changing the air outlet wind direction and the air outlet area of the air outlets.

Further, the number of the blades is 16-36.

Adopt the beneficial effect that above-mentioned technical scheme produced, when the homogenization rotor is at the uniform velocity rotatory, thereby the wind-powder mixture can be driven by the homogenization rotor and is inhaled in the little cavity that a plurality of blades formed via the air intake of bottom, along with the rotation of loculus, simultaneously the wind-powder mixture still can be from bottom to top, from inside to outside motion, and discharge via the air outlet of side, the exit structure and the size of air outlet can further be changed in the setting of choke block, the motion state diverse when making the wind-powder mixture discharge from the loculus, reach the effect of intensive mixing homogenization.

Furthermore, the choke blocks are fixedly filled at the upper ends of the inner sides of the air outlets at intervals and are fixedly connected with the lower plate and the blades on the two sides, and the area difference between any two adjacent air outlets is 10% -25%.

Adopt the beneficial effect that above-mentioned technical scheme produced to be, can adjust the air outlet size through setting up the choke block, make the air-out area change of adjacent air outlet to make the motion state diverse when the wind-powder mixture discharges from the loculus, reach the effect of intensive mixing homogenization.

Furthermore, the air outlets are 4-6 groups, each group of air outlets comprises a plurality of adjacent air outlets, the air outlets are sequentially and fixedly filled with the wind blocking blocks at the upper ends of the inner sides, the wind blocking blocks are fixedly connected with the lower plate and the blades at the two sides, the height of each group of air outlets is gradually increased, and the area difference between any two adjacent air outlets is 10% -25%.

In particular, the amount of the solvent to be used,

the beneficial effect who adopts above-mentioned technical scheme to produce is, through regular carrying out structural adjustment to the homogenization rotor, has guaranteed the stability of the rotatory operation of homogenization rotor, and the setting that the air outlet height progressively increases progressively makes the air-out area of every air outlet in every group air outlet all inequality, but the total area of air-out between group and the group is the same to can form the relative more stable wind-dust mixing district that circles round, make the wind-powder mixture reach the effect of intensive mixing homogenization better.

Furthermore, the wind blocking block comprises a block A, a block B and a block C, the block C is a vertically arranged triangular prism, the top of the block C is fixed on the lower plate, the bottom of the block C is fixed on the bottom ring so as to change the wind outlet direction and the wind outlet area of the air outlet, one vertical edge of the block C faces the wind outlet channel, and the side face corresponding to the vertical edge facing the wind outlet channel is arc-shaped; the A block is a vertically arranged triangular prism, the top of the A block is fixed on the lower plate, the bottom of the A block is fixed on the bottom ring so as to change the air outlet wind direction and the air outlet area of the air outlet, and one side face of the A block is fixedly connected with the blades; the B block and the A block are arranged in a mirror image mode, the C block, the A block and the B block are sequentially arranged in sequence, and one or more air outlets are arranged between the C block, the A block and the B block at intervals.

Adopt the beneficial effect that above-mentioned technical scheme produced, the C piece both can the effectual area that changes the air outlet, and make the air-out wind direction change along the side of triangular prism, make it mix the wind-powder, improve the homogenization effect, because A piece, B piece and C piece set up in the different positions of loculus, and A piece, B piece and C piece width also are different each other, thereby can produce the different effect of damming to the loculus, and then make the motion state diverse when wind-powder mixture discharges from the loculus, reach the effect of intensive mixing homogenization.

Specifically, can select exclusive use C piece, A piece, B piece in-service use, also can make up the use with C piece, A piece, B piece, its aim at can change the exit structure and the area of air outlet, the motion state diverse when making the wind-powder mixture discharge from air-out passageway reaches the effect of intensive mixing homogenization.

Furthermore, the area of the side edges of the C block, the A block and the B block facing the air outlet is 10% -25% of the area of the air outlet.

Further, the homogenizing rotor also comprises a plurality of blades, and the blades are fixed on the outer side of the wind resistance block in an asymmetrical and non-identical circumference mode.

Furthermore, the leaf fin is made of a wear-resistant material with the thickness of 50-80 mm, the length of 150-250 mm and the height of 100-180 mm.

The beneficial effect that adopts above-mentioned technical scheme to produce is that the blade wing can be to the further vortex of forming the annular airflow region between air outlet outside homogenization rotor and the coal pulverizer housing to further improve the interior wind powder homogenization effect of annular region.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a coal mill with a function of homogenizing coal dust according to the present invention;

FIG. 2 is a diagram illustrating the flow path of the air flow inside the coal mill with the function of homogenizing the air and the pulverized coal;

FIG. 3 is a schematic diagram of a pulverizing system of a coal pulverizer with a function of homogenizing air and pulverized coal provided by the present invention;

FIG. 4 is a schematic structural diagram of a central air intake assembly of a coal pulverizer with a function of homogenizing coal dust according to the present invention;

FIG. 5 is a sectional view of a homogenizing rotor of a coal mill with a wind power homogenizing function, wherein wind resistance blocks and blade wings of the homogenizing rotor are removed;

FIG. 6 is a front view of a homogenizing rotor in a first structural form of a coal pulverizer with a wind powder homogenizing function according to the present invention;

FIG. 7 is a perspective view of the view of FIG. 6;

FIG. 8 is a bottom view of the FIG. 6 drawing;

FIG. 9 is a front view of a homogenizing rotor in a second configuration for a coal pulverizer with a function of homogenizing coal dust according to the present invention;

FIG. 10 is a perspective view of the view of FIG. 9;

FIG. 11 is a bottom view of the drawing of FIG. 9;

FIG. 12 is a front view of a homogenizing rotor in a third configuration for a coal pulverizer with a function of homogenizing coal dust according to the present invention;

FIG. 13 is a perspective view of the view of FIG. 12;

FIG. 14 is a bottom view of the drawing of FIG. 12;

wherein: 100-coal mill shell, 101-discharge port, 200-primary air pipe, 300-powder conveying component, 400-powder grinding component, 401-grinding disc mechanism, 402-grinding roller mechanism, 403-spring loading mechanism, 500-powder homogenizing component, 600-driving mechanism, 700-homogenizing rotor, 701-air inlet, 702-air outlet, 703-central pipe, 704-cone, 7041-upper plate, 7042-lower plate, blade, 706-bottom ring, 707-wind blocking block, 7071-A block, 7072-B block, 7073-C block, 708-blade fin, 800-central air inlet component, 801-air inlet pipe, 802-air sleeve, 803-regulating valve, 804-wear-resistant guard plate, 1000-coal mill, 2000-coal powder pipeline, 3000-boiler.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The utility model discloses a coal pulverizer with wind powder homogenization function, coal pulverizer 1000 utilize buggy pipeline 2000 to link to each other with boiler 3000, include:

the coal mill comprises a coal mill shell 100, wherein a discharge hole 101 is formed in the top of the coal mill shell 100, one end of a pulverized coal pipeline 2000 is communicated with the discharge hole 101, and a primary air pipe 200 communicated with the coal mill shell 100 is further arranged on the side wall of the bottom of the coal mill shell 100;

the powder conveying assembly 300 is inserted into the coal mill housing 100 through the center of the top of the coal mill housing 100, and is communicated with the coal mill housing 100;

the powder grinding assembly 400 is rotatably connected to the bottom of the coal mill housing 100, and is opposite to the powder conveying assembly 300;

the material powder homogenizing assembly 500, the material powder homogenizing assembly 500 comprises a driving mechanism 600 and a homogenizing rotor 700, the driving mechanism 600 is arranged at the top of the coal mill shell 100, the homogenizing rotor 700 is arranged in the coal mill shell 100 and is arranged opposite to the material powder grinding assembly 400, the driving mechanism 600 drives the homogenizing rotor 700 to rotate and sleeve on the material powder conveying assembly 300, and an air inlet 701 and an air outlet 702 are respectively formed on the bottom and the side wall of the homogenizing rotor 700;

and a central air inlet assembly 800, one end of the central air inlet assembly 800 is communicated with the primary air pipe 200, and the other end is an air outlet end which is bent and inserted into the coal mill shell 100 and communicated with the material powder conveying assembly 300.

According to the utility model discloses an optional embodiment, material powder conveying component 300 is the coal breakage pipe, and discharge gate 101 is a plurality ofly, and a plurality of discharge gates 101 are evenly arranged in coal breakage pipe week side to make this coal pulverizer compact structure nature strong, be convenient for make the wind-powder mixture after the homogenization get into the boiler via a plurality of discharge gates and coal dust pipeline, improve the combustion efficiency and the operation security of boiler.

As shown in fig. 1, 2 and 4, according to an alternative embodiment of the present invention, the central air intake assembly 800 includes an air intake pipe 801, an air jacket 802 and a regulating valve 803, wherein one end of the air intake pipe 801 is communicated with the primary air pipe 200, and the other end is communicated with the side wall of the air jacket 802 to form a whole; the air sleeve 802 and one end of the air inlet pipe 801 are bent and inserted into the coal mill shell 100, and the air sleeve 802 is sleeved and fixed at the lower end of the coal dropping pipe; the adjusting valve 803 is arranged on the air inlet pipe 801, a part of primary air can directly enter the center of the coal mill by utilizing the air inlet pipe, and a part of primary air is blown to the center of the material powder grinding assembly through the air sleeve, so that the condition that the primary air is not uniformly ground is improved, the problem of non-uniform air powder caused by non-uniform grinding of the primary air is weakened, and the ventilation volume can be adjusted by utilizing the adjusting valve according to the actual operation condition.

As shown in fig. 4, according to an optional embodiment of the present invention, the central air intake assembly 800 further includes a wear-resistant guard plate 804, the cross section of the wear-resistant guard plate 804 is semicircular, and the wear-resistant guard plate 804 is fixed to the bottom of the other end of the air inlet pipe 401 and corresponds to the position of the air flowing direction in the coal mill casing 100, the air flow formed when the air-powder mixture moves from bottom to top is more serious in erosion and abrasion to the bottom of the air inlet pipe, and the wear-resistant guard plate can play a role in protecting the air inlet pipe.

According to the utility model discloses an optional embodiment, wear-resisting backplate 804 adopts wear-resisting steel sheet to make, and wear-resisting backplate 804's thickness is 25mm to can effectively protect the air-supply line other end, extension air-supply line life.

As shown in fig. 1 and 2, according to an optional embodiment of the present invention, the powder grinding assembly 400 includes a grinding disc mechanism 401, a grinding roller mechanism 402 and a spring loading mechanism 403, the grinding disc mechanism 401 is rotatably connected to the bottom of the coal mill housing 100 and is arranged opposite to the coal chute outlet and the homogenizing rotor 700, one end of the grinding roller mechanism 402 is fixed on the sidewall of the coal mill housing 100 by a limiting rod, the other end is abutted against the top of the grinding disc mechanism 401, one end of the spring loading mechanism 403 is inserted into the sidewall of the coal mill housing 100 and is abutted against the grinding roller mechanism 402, so that the whole structure of the coal mill is reasonable in design, the connection structure between the grinding roller mechanism and the grinding disc mechanism can be used to fully grind the powder, and the particle size of the powder is reduced.

According to the utility model discloses an optional embodiment, grinding roller mechanism 402 and spring-loaded mechanism 403 are three, and three grinding roller mechanism 402 evenly arranges at mill 401 top, and three spring-loaded mechanism 403 butt respectively on corresponding three grinding roller mechanism 402 to can further improve the grinding efficiency of this coal pulverizer to the buggy.

As shown in fig. 5-14, according to an alternative embodiment of the present invention, the homogenizing rotor 700 comprises a central tube 703, a cone 704, blades 705, a bottom ring 706 and a choke block 707, and the driving mechanism 600 drives the central tube 703 to rotatably sleeve on the coal dropping pipe; the cone 704 comprises an upper plate 7041 and a lower plate 7042, the upper plate 7041 is a circular table with a hole in the middle, the lower plate 7042 is a rounded table with a hole in the middle, opposite side edges of the upper plate 7041 and the lower plate 7042 are fixedly connected, and the upper plate 7041 and the lower plate 7042 are fixedly sleeved outside the central tube 703; the number of the blades 705 is multiple, the blades 705 are uniformly arranged on the same circumferential surface along the side wall of the central tube 703, the tops of the blades 705 are fixedly connected to the bottom end surface of the lower plate 7042, the bottom ring 706 is fixed to the outer side of the lower ends of the blades 705, the middle of the bottom ring 706 is provided with an air inlet 701, a plurality of air outlets 702 are formed among the blades 705, the lower plate 7042 and the bottom ring 706, and a wind blocking block 707 is fixed at the air outlet 702 and used for changing the air outlet direction and the air outlet area of the air outlet 702; specifically, the number of vanes 705 is 36; when the homogenizing rotor is at the uniform velocity rotatory, thereby the wind-powder mixture can be driven by the homogenizing rotor and inhaled in the little cavity that a plurality of blades formed via the air intake of bottom, along with the little cavity is together rotatory, simultaneously the wind-powder mixture still can be from bottom to top, from inside to outside motion to discharge via the air outlet of side, the setting of choke block can further change the outlet structure and the size of air outlet, the motion state diverse when making the wind-powder mixture discharge from the little cavity reaches the effect of intensive mixing homogenization.

As shown in fig. 6-8, according to the utility model discloses an optional embodiment, block 707 interval is fixed to be filled in the inboard upper end of air outlet 702, and with hypoplastron 7042 and both sides blade 705 fixed connection, the area difference between two arbitrary adjacent air outlets 702 is 10% ~ 25%, can adjust the air outlet size through setting up the block, makes the air-out area change of adjacent air outlet to the motion state diverse when making the wind-powder mixture discharge from the loculus, reaches the effect of intensive mixing homogenization.

As shown in fig. 9-11, according to an alternative embodiment of the present invention, the air outlets 702 are 4-6 groups, each group of air outlets 702 comprises a plurality of adjacent air outlets 702, and each group of air outlets 702 is sequentially and fixedly filled with a choke block 707 at the upper end of the inner side, the choke block 707 is fixedly connected with the lower plate 7042 and the blades 705 at the two sides, the height of each group of air outlets 702 is gradually increased, the area difference between any two adjacent air outlets 702 is 10-25%, the homogenization rotor is regularly adjusted in structure, the stability of the rotation operation of the homogenization rotor is ensured, the air outlet area of each air outlet in each air outlet group is different due to the arrangement that the heights of the air outlets are gradually increased, but the total air outlet area between the groups is the same, therefore, a relatively stable air-dust mixing and swirling area can be formed, and the air-powder mixture can achieve better effect of fully mixing and homogenizing.

As shown in fig. 12-14, according to an optional embodiment of the present invention, the wind blocking block 707 includes a block a 7071, a block B7072, and a block C7073, the block C7073 is a vertically disposed triangular prism, the top of the block is fixed to the lower plate 7042, the bottom of the block C is fixed to the bottom ring 706 to change the wind direction and the wind outlet area of the wind outlet 702, one of the vertical edges of the block C7073 faces the wind outlet channel, and the side corresponding to the vertical edge facing the wind outlet channel is arc-shaped; the a block 7071 is a vertically arranged triangular prism, the top of which is fixed to the lower plate 7042, and the bottom of which is fixed to the bottom ring 706 to change the wind outlet direction and the wind outlet area of the wind outlet 702, and one side surface of the a block 7071 is fixedly connected to the blade 705; the B block 7072 and the A block 7071 are arranged in a mirror image manner, the C block 7073, the A block 7071 and the B block 7072 are sequentially arranged, and one or more air outlets 702 are arranged among each group of the C block 7073, the A block 7071 and the B block 7072 at intervals; specifically, the side areas of the C block 7073, the a block 7071 and the B block 7072 facing the air outlet 702 are 10% -25% of the area of the air outlet 702, and the a block, the B block and the C block are arranged at different positions of the small chamber, and the a block, the B block and the C block have different widths from each other, so that different closure effects can be generated on the small chamber, and further, the movement states of the air-powder mixture discharged from the small chamber are different from each other, and the effect of full mixing and homogenization is achieved.

As shown in fig. 6-14, according to an alternative embodiment of the present invention, the homogenizing rotor 700 further comprises a plurality of fins 708, the plurality of fins 708 are asymmetric and fixed on the outer side of the wind blocking block 707 on the non-uniform circumference; specifically, the blade fin 708 is nodular cast iron or wear-resisting steel with the thickness of 50-80 mm, the length of 150-250 mm and the height of 100-180 mm, and the blade fin can further disturb an annular airflow area formed between the homogenizing rotor at the outer side of the air outlet and the shell of the coal mill, so that the air powder homogenizing effect in the annular area is further improved.

The utility model discloses a coal pulverizer with wind powder homogenization function, through utilizing the material powder grinding assembly that sets up with material powder conveying assembly relatively, can realize fully grinding the material powder, reduce the material powder granularity; part of primary air can directly enter the material powder conveying assembly by utilizing the central air inlet assembly, and part of the primary air is blown to the center of the material powder grinding assembly through the material powder conveying assembly, so that the condition of uneven grinding of the primary air is improved, and the problem of uneven wind powder caused by uneven grinding of the primary air is weakened; the air-powder mixture in the shell of the coal mill can be homogenized by the homogenizing rotor, and the homogenized air-powder mixture enters an annular area between the homogenizing rotor and the shell of the coal mill, so that the air-powder mixture is further homogenized, and the air-powder mixture achieves the effect of fully mixing and homogenizing. This coal pulverizer structural design is reasonable, when carrying out the thickness separation to the buggy, can also carry out homogenization treatment to the wind powder mixture, and wind powder homogenization is effectual, has effectively reduced the wind powder deviation in the buggy pipeline, has improved the combustion efficiency of boiler and the security of operation, has good application prospect.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A coal mill with air-powder homogenizing function, the coal mill (1000) is connected with a boiler (3000) by a coal powder pipeline (2000), characterized by comprising:

the coal mill comprises a coal mill shell (100), wherein a discharge hole (101) is formed in the top of the coal mill shell (100), one end of a pulverized coal pipeline (2000) is communicated with the discharge hole (101), and a primary air pipe (200) communicated with the coal mill shell (100) is arranged on the bottom side wall of the coal mill shell (100);

the powder conveying assembly (300) penetrates through the center of the top of the coal mill shell (100), is inserted into the coal mill shell (100), and is communicated with the coal mill shell (100);

the powder grinding assembly (400), the powder grinding assembly (400) is rotatably connected to the bottom of the coal mill housing (100) and is opposite to the powder conveying assembly (300);

the material powder homogenizing assembly (500), the material powder homogenizing assembly (500) comprises a driving mechanism (600) and a homogenizing rotor (700), the driving mechanism (600) is arranged at the top of the coal mill shell (100), the homogenizing rotor (700) is arranged in the coal mill shell (100) and is arranged opposite to the material powder grinding assembly (400), the driving mechanism (600) drives the homogenizing rotor (700) to be rotatably sleeved on the material powder conveying assembly (300), and an air inlet (701) and an air outlet (702) are formed in the bottom and the side wall of the homogenizing rotor (700) respectively;

and the central air inlet assembly (800), one end of the central air inlet assembly (800) is communicated with the primary air pipe (200), the other end of the central air inlet assembly is an air outlet end, and the central air inlet assembly is inserted into the coal mill shell (100) in a bending mode and is communicated with the material powder conveying assembly (300).

2. The coal pulverizer with the air-powder homogenizing function according to claim 1, wherein the powder conveying assembly (300) is a coal dropping pipe, the discharge ports (101) are multiple, and the multiple discharge ports (101) are uniformly arranged on the periphery of the coal dropping pipe.

3. The coal mill with the air powder homogenizing function as claimed in claim 2, characterized in that the central air intake assembly (800) comprises an air intake pipe (801), an air jacket (802) and a regulating valve (803), wherein one end of the air intake pipe (801) is communicated with the primary air pipe (200), and the other end of the air intake pipe (801) is communicated with the side wall of the air jacket (802) to form a whole; the air sleeve (802) and one end of the air inlet pipe (801) are bent and inserted into the coal mill shell (100), and the air sleeve (802) is fixedly sleeved at the lower end of the coal dropping pipe; the adjusting valve (803) is arranged on the air inlet pipe (801).

4. The coal mill with the air and powder homogenizing function as claimed in claim 3, characterized in that the central air intake assembly (800) further comprises a wear-resistant guard plate (804), the cross section of the wear-resistant guard plate (804) is semicircular, and the wear-resistant guard plate (804) is fixed at the bottom of the other end of the air inlet pipe (801) and corresponds to the position of the air flowing direction in the coal mill casing (100).

5. The coal mill with the air-powder homogenizing function according to claim 2, characterized in that the material-powder grinding assembly (400) comprises a grinding disc mechanism (401), a grinding roller mechanism (402) and a spring loading mechanism (403), wherein the grinding disc mechanism (401) is rotatably connected to the bottom of the coal mill casing (100) and is arranged opposite to the coal dropping pipe outlet and the homogenizing rotor (700), one end of the grinding roller mechanism (402) is fixed on the side wall of the coal mill casing (100) by a limiting rod, the other end of the grinding roller mechanism abuts against the top of the grinding disc mechanism (401), and one end of the spring loading mechanism (403) is inserted into the side wall of the coal mill casing (100) and abuts against the grinding roller mechanism (402).

6. The coal mill with the air-powder homogenizing function according to claim 2, wherein the homogenizing rotor (700) comprises a central pipe (703), a cone (704), blades (705), a bottom ring (706) and a choke block (707), and the driving mechanism (600) drives the central pipe (703) to be rotatably sleeved on the coal dropping pipe; the cone (704) comprises an upper plate (7041) and a lower plate (7042), the upper plate (7041) is a circular table top with an opening in the middle, the lower plate (7042) is a rounded table top with an opening in the middle, the upper plate (7041) and one opposite side edge of the lower plate (7042) are fixedly connected, and the upper plate (7041) and the lower plate (7042) are fixedly sleeved on the outer side of the central tube (703); the air-out structure is characterized in that the number of the blades (705) is multiple, the blades (705) are uniformly arranged on the same circumferential surface along the side wall of the central pipe (703), the tops of the blades (705) are fixedly connected to the bottom end surface of the lower plate (7042), the bottom ring (706) is fixed to the outer side of the lower ends of the blades (705), the air inlet (701) is arranged in the middle of the bottom ring (706), the air outlets (702) are formed among the blades (705), the lower plate (7042) and the bottom ring (706), and the air blocking block (707) is fixed to the air outlet (702) and used for changing the air outlet direction and the air outlet area of the air outlet (702).

7. The coal mill with the air powder homogenizing function according to claim 6, wherein the wind blocking blocks (707) are fixedly filled at the upper end of the inner side of the air outlet (702) at intervals and are fixedly connected with the lower plate (7042) and the blades (705) on two sides, and the area difference between any two adjacent air outlets (702) is 10% -25%.

8. The coal mill with the air powder homogenizing function according to claim 6, wherein the number of the air outlets (702) is 4-6, each air outlet (702) comprises a plurality of adjacent air outlets (702), each air outlet (702) is sequentially and fixedly filled with the air blocking block (707) at the upper end of the inner side, the air blocking block (707) is fixedly connected with the lower plate (7042) and the blades (705) at the two sides, the height of each air outlet (702) is gradually increased, and the area difference between any two adjacent air outlets (702) is 10% -25%.

9. The coal mill with the air and powder homogenizing function according to claim 6, wherein the wind blocking block (707) comprises an A block (7071), a B block (7072) and a C block (7073), the C block (7073) is a vertically arranged triangular prism, the top of the C block is fixed on the lower plate (7042), the bottom of the C block is fixed on the bottom ring (706) to change the air outlet wind direction and the air outlet area of the air outlet (702), one vertical edge of the C block (7073) faces the air outlet channel, and the side face corresponding to the vertical edge facing the air outlet channel is in an arc shape; the A block (7071) is a vertically arranged triangular prism, the top of the A block is fixed on the lower plate (7042), the bottom of the A block is fixed on the bottom ring (706) so as to change the air outlet wind direction and the air outlet area of the air outlet (702), and one side face of the A block (7071) is fixedly connected with the blade (705); the B block (7072) and the A block (7071) are arranged in a mirror image mode, the C block (7073), the A block (7071) and the B block (7072) are sequentially arranged, and one or more air outlets (702) are arranged among the C block (7073), the A block (7071) and the B block (7072) at intervals in each group.

10. The coal mill with the wind powder homogenizing function according to any one of claims 7 to 9, characterized in that the homogenizing rotor (700) further comprises a plurality of vanes (708), and the vanes (708) are fixed outside the wind blocking block (707) in an asymmetric and non-uniform circumferential manner.

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