CN215901944U

CN215901944U - Air ring air duct structure of coal mill

Info

Publication number: CN215901944U
Application number: CN202121402583.2U
Authority: CN
Inventors: 朱安钰; 李洪涛; 李延怀; 夏洲; 李小健
Original assignee: Huaneng Chaohu Power Generation Co Ltd
Current assignee: Huaneng Chaohu Power Generation Co Ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-02-25
Anticipated expiration: 2031-06-23

Abstract

The utility model discloses a coal mill wind ring air duct structure, which is characterized in that an original straight plate type wind ring is transformed into a tapered throttling wind ring, the wind speed of an outlet of the wind ring is improved, the pebble coal quantity of a coal mill can be effectively reduced, the tapered throttling wind ring can accord with hydrodynamics, the resistance of the wind ring can be reduced, wind beams passing through the wind ring enter a roller grinding chamber at an angle of 45 degrees to the horizontal plane, and primary wind airflow generates shear and the airflow of the shear, so that hot wind forms spiral ascending airflow in the coal mill; the tapered air duct improves the primary air speed and improves the carrying capacity of air-powder mixing, thereby reducing the discharge capacity of pebble coal. Through the improvements, a pulverized coal airflow field is effectively improved, the wind speed of an air ring outlet in the coal mill is improved, the primary wind powder carrying capacity is improved, the end part rotational flow of the blade is effectively eliminated, and the pebble coal emission is reduced; meanwhile, the abrasion of each component of the wind ring is reduced, the maintenance time is shortened, and the maintenance cost is reduced.

Description

Air ring air duct structure of coal mill

Technical Field

The utility model relates to the technical field of coal mill components, in particular to an air ring air duct structure of a coal mill.

Background

The coal mill is a machine for crushing and grinding coal briquettes into coal powder, is an important auxiliary device of a coal powder furnace, and has models such as a vertical mill, a high-pressure suspension roller mill, a medium-speed micro-mill, an overpressure trapezoidal mill, a Raymond mill and the like; the coal mill is a key device for crushing after the material is crushed; the coal mill is widely applied to the production industries of cement, silicate products, novel building materials, refractory materials, chemical fertilizers, black and non-ferrous metal ore dressing, glass ceramics and the like, and is used for dry or wet grinding of various ores and other grindable materials.

At present, in the industry, the blade at the air duct outlet of the coal mill is usually designed to be a straight plate type blade, and the blade easily forms a small rotational flow at the outlet end part to increase the airflow resistance.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model aims to provide a wind ring air duct structure of a coal mill, which is characterized in that an original straight plate type blade is transformed into a tapered blade, the wind speed of a wind ring outlet is improved, the quantity of pebbles and coals of the coal mill can be effectively reduced, and the tapered throttling wind ring can accord with hydrodynamics and reduce the resistance of the wind ring.

The purpose of the utility model can be realized by the following technical scheme:

a coal mill air ring air duct structure comprises a coal mill, wherein a throttling air ring is arranged in the coal mill, and the throttling air ring is a tapered throttling air ring arranged at equal intervals;

an air ring outlet area is formed between the gradually-reduced throttling air rings; the tapered throttling air ring comprises an initial end, a terminal end and a guide end, and a first air supply end is formed between the initial end and the terminal end;

an included angle alpha between the starting end and the terminal end is 27 degrees; a top end is formed between the end point end and the guide end, and an included angle beta between the end point end and the guide end is 0 degree;

and a second air supply end is formed between the starting end and the guide end, and the starting end and the guide end are in an arc shape.

Furthermore, wind beams flow into the wind ring outlet area and enter the grinding roller chamber along the first wind supply end and the second wind supply end at an angle of 45 degrees on the horizontal plane.

Further, the radian of the second air supply end is 7 rad.

Further, the length between the end point end and the leading end is Ncm, and N is a real number equal to or greater than 1.

Furthermore, an inner cavity is arranged in the tapered throttling air ring.

Further, the inner cavity is triangular.

The utility model has the beneficial effects that:

the original straight plate type air ring is transformed into a tapered throttling air ring, the air speed at the outlet of the air ring is increased, the quantity of pebble coal of the coal mill can be effectively reduced, the tapered throttling air ring can accord with hydromechanics, the resistance of the air ring can be reduced, and air beams passing through the air ring enter a grinding roller chamber at an angle of 45 degrees to the horizontal plane, so that hot air forms spiral ascending air flow in the coal mill; the tapered air duct improves the primary air speed and improves the carrying capacity of air-powder mixing, thereby reducing the discharge capacity of pebble coal. The wind ring wear-resisting plate is made of wear-resisting materials with higher strength, so that the wear is reduced, and the service life is longer. Through the improvements, the internal airflow field of the pulverized coal is effectively improved, the powder carrying capacity of primary air in the coal mill is improved, and the output of the coal mill is improved. The design effectively eliminates the rotational flow at the end part of the blade, reduces the local resistance, improves the wind speed and reduces the discharge of pebble coal; meanwhile, the wear-resistant material reduces the wear of each component of the wind ring, reduces the maintenance time and reduces the maintenance cost.

Drawings

The utility model will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic view of the tapered throttle ring structure of the present invention.

In the figure: 1. a starting end; 2. a terminal end; 3. a leading end; 4. an inner cavity; 5. a first air supply end; 6. a second air supply end; 7. a top end; 8. a tapered throttling air ring; 9. a cylindrical mounting post; 10. a deformation spring; 11. a flexible jacket.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention relates to an air duct structure of an air ring of a coal mill, which comprises a coal mill, wherein a throttling air ring is arranged in the coal mill, and the throttling air ring is a tapered throttling air ring 8 arranged at equal intervals;

an air ring outlet area is formed between the gradually-reduced throttling air rings 8;

the tapered throttling air ring 8 comprises an initial end 1, a terminal end 2 and a guide end 3, a first air supply end 5 is formed between the initial end 1 and the terminal end 2, and an included angle alpha between the initial end 1 and the terminal end 2 is 27 degrees; a top end 7 is formed between the end point end 2 and the leading end 3, and an included angle beta between the end point end 2 and the leading end 3 is 0 degree; a second air supply end 6 is formed between the starting end 1 and the leading end 3, and the starting end 1 and the leading end 3 are in an arc shape.

Wind beams flow into the wind ring outlet area and enter the roller chamber along the first wind supply end 5 and the second wind supply end 6 at an angle of 45 degrees on the horizontal plane.

The radian of the second air supply end 6 is 7 rad.

An inner cavity 4 is arranged in the tapered throttling wind ring 8.

The inner cavity 4 is triangular.

Be equipped with cylindrical erection column 9 between first air supply end 5 and the top 7, cylindrical erection column 9 is seted up in one side of top 7, is equipped with deformation spring 10 on the cylindrical erection column 9, and embedded chamber has been seted up to one side of first air supply end 5, and the one end of deformation spring 10 is cup jointed on cylindrical erection column 9, and the other end embedding of deformation spring 10 is at embedded intracavity.

The cylindrical mounting post 9 is wrapped with a flexible jacket 11.

The working principle is as follows:

the problems existing in the throttling air ring of the HP1003 type coal mill directly affect the performance of the coal mill, and the coal consumption of a unit is increased. Combining the coal pulverizer actual operation condition, this transformation utilizes unit overhaul and level and examine at ordinary times, changes original straight plate formula throttle wind ring into gradual reduction formula throttle wind ring 8, improves the wind ring wind speed through reducing the through-flow area to reduce the discharge capacity of pebble coal, after the transformation, new gradual reduction formula throttle wind ring 8 compares with original straight plate formula throttle wind ring, and the through-flow area reduces, and the air volume of coal pulverizer does not change, so the wind speed through gradual reduction formula throttle wind ring 8 has just improved. The wing-shaped wind ring adopts streamline wing-shaped blades, and can effectively eliminate the rotational flow at the end parts of the blades. The wind beams passing through the wind ring enter the roller grinding chamber at an angle of 45 degrees with the horizontal plane, the primary wind airflow generates shear and shearing airflow, and the high-speed primary wind beam speed is added, so that the hot wind forms spiral ascending airflow inside the coal grinding mill, and the hot wind is fully mixed and dried with coal powder and coal falling from a coal dropping pipe in a grinding area at the center of the coal grinding mill, thereby improving the carrying capacity of wind-powder mixing and the separation capacity of the coal powder. The wind ring wear-resisting plate is made of wear-resisting materials with higher strength, so that the wear is reduced, and the service life is longer. Through the improvements, the coal powder, pebble coal and separation effect is effectively improved, the primary air carrying capacity of the mixing efficiency of air and powder of an upper shell in the coal mill is improved, the output of a uniform coal mill for coal powder is improved, the rotational flow at the end part of a blade is effectively eliminated, the local resistance is reduced, the air speed is improved, the discharge of pebble coal is reduced, the rotational flow at the end part of the blade is effectively eliminated, and the discharge of pebble coal is reduced; meanwhile, the abrasion of each component of the wind ring is reduced, the maintenance time is shortened, and the maintenance cost is reduced.

The foregoing is merely exemplary and illustrative of the present invention, and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the scope of the utility model as defined in the accompanying claims.

Claims

1. A coal mill air ring air duct structure comprises a coal mill and is characterized in that a throttling air ring is arranged in the coal mill, and the throttling air ring is a tapered throttling air ring (8) arranged at equal intervals;

an air ring outlet area is formed between the gradually-reduced throttling air rings (8); the tapered throttling air ring (8) comprises an initial end (1), a terminal end (2) and a guide end (3), and a first air supply end (5) is formed between the initial end (1) and the terminal end (2);

an included angle alpha between the starting end (1) and the terminal end (2) is 27 degrees; a top end (7) is formed between the end point end (2) and the guide end (3), and an included angle beta between the end point end (2) and the guide end (3) is 0 degree;

a second air supply end (6) is formed between the starting end (1) and the guide end (3), and an arc shape is formed between the starting end (1) and the guide end (3).

2. The coal mill wind ring duct structure according to claim 1, characterized in that the wind ring exit area is provided with wind beams entering the mill roller chamber at 45 ° to the horizontal plane along the first (5) and second (6) wind supply ends.

3. The coal mill wind ring channel structure according to any one of claims 1 to 2, characterized in that the radian of the second wind delivery end (6) is 7 rad.

4. The structure of the coal mill air ring channel according to claim 1, characterized in that the length between the end point end (2) and the leading end (3) is Ncm, and N is a real number greater than or equal to 1.

5. The air duct structure of the coal mill air ring according to claim 1, characterized in that an inner cavity (4) is arranged in the tapered throttling air ring (8).

6. The structure of the air ring duct of the coal mill as claimed in claim 5, characterized in that the inner cavity (4) is triangular.