CN211725991U

CN211725991U - Wind sweeping coal mill

Info

Publication number: CN211725991U
Application number: CN201922194656.2U
Authority: CN
Inventors: 方钢
Original assignee: Sichuan Mianzhu Aodong Cement Co ltd
Current assignee: Sichuan Mianzhu Aodong Cement Co ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-10-23
Anticipated expiration: 2029-12-09

Abstract

The utility model relates to a cement manufacture equipment field discloses a coal mill is swept to wind, including the mill barrel, mill barrel both ends are provided with feed arrangement and discharging device respectively, be provided with welt mechanism on the inner wall of mill barrel, welt mechanism is put from the feeding and is held to discharging device and include big wave form welt, the hierarchical welt of toper and little wave form welt in proper order, the intussuseption of mill barrel is filled with the different steel ball of a plurality of diameter. The utility model discloses can improve the grinding effect of raw coal, increase the coal mill platform and produce, reduction in production cost improves economic benefits.

Description

Wind sweeping coal mill

Technical Field

The utility model relates to a cement manufacture equipment field particularly, relates to a coal mill is swept to wind.

Background

The air swept coal mill is a main device of a cement production line, is used for drying and grinding pulverized coal, mainly comprises a feeding device, a main bearing, a rotary part, a transmission device, a discharging device, a high-pressure starting device and a lubricating system, and is an ideal device for preparing the pulverized coal. Raw coal enters a feeding device of a mill from feeding equipment, hot air with the temperature of about 300 ℃ also enters the feeding device through an air inlet pipe, the coal and the hot air exchange heat in the mill along with the rotation of a mill cylinder in the process of milling materials, the coal is crushed and ground in the mill, and fine powder is taken out of the mill through the hot air in the mill through a discharging device while the coal is ground.

However, as the price of raw coal is greatly increased in recent years, in order to reduce the cost of clinker, on the premise of basically unchanging heat value, cheaper coal blending is used, in order to meet the requirement of environmental protection in the processes of shovel loading and transportation, excessive water is sprayed into the raw coal entering grinding, so that the moisture of the raw coal entering grinding is higher and even reaches 10-12%, the drying capacity of the coal grinding in production is insufficient, the coal grinding partition board is blocked for many times, the wet coal at the head of a drying bin is looped, the moisture of coal powder is out of control, the fineness of the coal powder is thicker and difficult to control, the yield is reduced and other adverse effects are caused. In order to keep the requirements of continuous operation of the coal mill and coal consumption of a kiln system, the coal mill has less downtime and less regular inspection time, thereby seriously restricting production and reducing the quality of coal powder.

The intrinsic feed arrangement rear end of current mill generally all is provided with the stoving storehouse, is equipped with the lifting blade in the stoving storehouse and raises the raw coal for the raw coal carries out the heat exchange here and obtains drying, and the coal cinder after the stoving gets into the grinding storehouse through the compartment board that is equipped with the lifting blade and smashes, discovers through the experience of inventor many years: the drying bin and the partition board occupy a larger grinding space of the mill, so that the grinding efficiency is reduced, and the yield of a coal mill table is reduced; and because the setting of partition panel makes mill internal resistance increase, mill internal ventilation effect reduces, causes very big influence to the crushing and the stoving of the material in the grinding storehouse, and then makes to obtain that the mill temperature reduces, and buggy moisture is not up to standard.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a coal mill is swept to wind, its grinding effect that can improve the raw coal increases the coal and grinds the platform and produce, reduction in production cost, improvement economic benefits.

The embodiment of the utility model is realized like this:

the utility model provides a coal mill is swept to wind, includes the mill barrel, mill barrel both ends are provided with feed arrangement and discharging device respectively, be provided with welt mechanism on the inner wall of mill barrel, welt mechanism is put from the feeding and is held to discharging device end and include big wave form welt, the hierarchical welt of toper and little wave form welt in proper order, the intussuseption of mill barrel is filled with the different steel ball of a plurality of diameter.

Further, the diameters of the steel balls include 20mm, 30mm, 40mm, 50mm, and 60 mm.

Further, the proportion of the steel balls with different diameters is 20 mm: 30 mm: 40 mm: 50 mm: 60 mm-4: 5: 5: 3: 3.

furthermore, the surface hardness of the steel ball is not lower than 59HRC, and the core hardness is not lower than 57 HRC.

Further, the filling rate of the steel balls is 15-20%.

Further, the height of the small corrugated lining plate is 1/3-1/2 of the height of the large corrugated lining plate.

Further, the length of the conical grading liner plate section accounts for 30% -50% of the length of the mill cylinder.

Furthermore, a first spiral sheet is arranged at a coal inlet of the feeding device, a second spiral sheet is arranged at a coal outlet of the discharging device, and the rotating directions of the first spiral sheet and the second spiral sheet are opposite. The louver type structure with oblique air inlet and oblique feeding is adopted, so that the feeding is smoother, the heat exchange capacity of the mill is enhanced, and the phenomenon of material blockage at the inlet of the coal mill is effectively prevented.

Furthermore, the included angle formed by the first spiral sheet and the second spiral sheet and the horizontal line is 45-60 degrees.

The utility model has the advantages that:

1. the coal mill of the utility model removes the lifting plate and the partition plate of the drying bin of the coal mill, and lays the large corrugated lining plate on the inner wall, thereby increasing the length of the grinding bin of the coal mill, increasing the grinding space, further increasing the platform yield of the coal mill by more than 10 percent, and improving the economic benefit; meanwhile, after the partition plate is removed, the internal resistance of the mill is reduced, the ventilation effect in the mill is enhanced, the drying effect of coal in the mill can be ensured, the mill-out temperature of the pulverized coal is increased, the moisture content of the pulverized coal is reduced, the fineness is easier to control, the quality of pulverized coal products is improved, the energy consumption is reduced by more than 20%, the equipment operation rate is increased, and the investment of production cost is greatly reduced.

2. The utility model discloses lay big wave form welt, toper hierarchical welt and little wave form welt in proper order in the coal mill, in the process of grinding, make big, the rolling of minor diameter steel ball respectively to feed end and discharge end, undertake the effect of breakage and grinding respectively, make grinding efficiency promote by a wide margin, guarantee that buggy output and fineness reach standard, thereby can reduce the steel ball dress ball volume, practice thrift the cost; in addition, along with the great reduction of the loading capacity, the consumption of the steel balls can be reduced in the daily operation process, the estimated reduction by more than 10% is compared with that before modification, and finally, the operation load of the coal mill is reduced, so that the operation safety of equipment is guaranteed, and the maintenance and repair work of the equipment is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of a coal mill provided by an embodiment of the present invention;

FIG. 2 is a side view of the large corrugated liner of FIG. 1 at A in accordance with the present invention;

FIG. 3 is a side view of the tapered graded lining plate of FIG. 1 at B according to the present invention;

figure 4 is a side view of the small corrugated liner plate of figure 1 at C in accordance with the present invention.

Icon: 1-feeding device, 11-first spiral plate, 2-mill barrel, 3-large corrugated lining plate, 4-conical grading lining plate, 5-small corrugated lining plate, 6-discharging device, 61-second spiral plate and 7-steel ball.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

Referring to fig. 1, the present embodiment provides an air swept coal mill, which includes a mill barrel 2, a feeding device 1 and a discharging device 6 are respectively disposed at two ends of the mill barrel 2, a lining plate mechanism is disposed on an inner wall of the mill barrel 2, the lining plate mechanism sequentially includes a large waveform lining plate 3, a tapered grading lining plate 4 and a small waveform lining plate 5 from a feeding end to a discharging device 6 end, and a plurality of steel balls 7 with different diameters are filled in the mill barrel 2.

The working principle is as follows: the utility model discloses coal device and air-blast device are connected into to coal mill's feed arrangement 1, it can be auger delivery ware to advance the coal device, auger delivery ware is connected with feed arrangement 1, carry raw coal in to mill barrel 2, the air-blast device is to carrying hot-blast in mill barrel 2 simultaneously, along with mill barrel 2's rotation, the coal exchanges heat with hot-blast in mill barrel 2, steel ball 7 in mill barrel 2 collides with the coal simultaneously and is smashed, grind to the buggy, when the coal is ground, the fine powder is taken out mill barrel 2 via discharging device 6 by hot-blast in passing through mill barrel 2. In the process that the steel balls 7 collide with coal to be crushed and ground into pulverized coal, the working surface of the conical grading lining plate 4 is in a plough shape, the difference of the rolling properties of the large-diameter steel balls 7 and the small-diameter steel balls 7 is utilized, a spherical surface height difference is formed in the front and the back, so that the large-diameter steel balls 7 can be pushed to the feeding end in the rotation process of the mill cylinder 2, grading is realized, the large-diameter steel balls 7 and the small-diameter steel balls 7 roll to the feeding end and the discharging end respectively, large coal at the feeding end can be crushed firstly by the large-diameter steel balls 7, the small-diameter steel balls 7 can play a grinding role in the rotary conveying process of the coal, the large-diameter steel balls 7 and the small-diameter steel balls 7 are distributed more reasonably in the mill cylinder 2, the crushing and grinding roles are respectively borne, the grinding efficiency is greatly improved, the yield and the standard fineness of; meanwhile, the corrugated lining plate can protect the inner wall of the mill cylinder body 2 and prolong the experimental life of the mill cylinder body 2.

In the present embodiment, the diameters of the steel balls 7 include 20mm, 30mm, 40mm, 50mm, and 60 mm.

In this embodiment, the steel balls 7 with different diameters are 20 mm: 30 mm: 40 mm: 50 mm: 60 mm-4: 5: 5: 3: 3. by arranging the steel balls 7 with different diameter ranges and crushing and grinding according to a reasonable ratio, the grinding time and the grinding fineness of the coal briquettes can be remarkably improved, meanwhile, the loading capacity of the steel balls 7 in the mill cylinder 2 can be reduced, the load of the mill cylinder 2 is reduced, and the grinding effect and the economic benefit are improved.

In order to ensure the stability of the mixture ratio of the steel balls 7 with different diameters, in this embodiment, the surface hardness of the steel balls 7 is not lower than 59HRC, and the core hardness is not lower than 57 HRC.

In order to maintain a proper filling rate of the steel balls 7 in the mill cylinder 2, achieve a better grinding effect and improve the yield, in the embodiment, the filling rate of the steel balls 7 is 15-20%.

In this embodiment, the height of the small corrugated liner 5 is 1/3-1/2 of the height of the large corrugated liner 3. Thereby being more matched with the sized steel balls 7 after being classified.

In the embodiment, the length of the conical grading lining plate 4 section accounts for 30-50% of the length of the mill cylinder body 2.

In this embodiment, a first spiral blade 11 is disposed in the feeding device 1, a second spiral blade 61 is disposed in the discharging device 6, the spiral directions of the first spiral blade 11 and the second spiral blade 61 are opposite, and an included angle formed by the first spiral blade 11 and the second spiral blade 61 and a horizontal line is 45-60 °. The feeding device 1 adopts a mode of oblique air inlet and oblique feeding, so that the feeding is smoother, the heat exchange capability of the mill cylinder 2 is enhanced, and the phenomenon of material blockage at the inlet end can be effectively prevented; by adopting the second spiral sheet 61 with the opposite rotation direction to the first spiral sheet 11 in the feeding device 1, when the pulverized coal is discharged from the discharging device 6, the coarse particles can return to the mill cylinder 2 for being ground again through the second spiral sheet 61 of the discharging device 6.

To sum up, the coal mill of the utility model removes the lifting blade and the partition plate of the drying bin of the coal mill, and lays the large corrugated lining plate on the inner wall, thereby increasing the length of the grinding bin of the coal mill, increasing the grinding space, further increasing the bench yield of the coal mill by more than 10 percent, and improving the economic benefit; meanwhile, after the partition plate is removed, the internal resistance of the mill is reduced, the ventilation effect in the mill is enhanced, the drying effect of coal in the mill can be ensured, the milling temperature of the pulverized coal is improved by more than 5 ℃ compared with that before modification, the moisture of milled pulverized coal is reduced to within 3%, the fineness is reduced to within 3%, the control is easier, the quality of pulverized coal products is improved, the energy consumption is reduced by more than 20%, and the equipment operation rate is improved. The large corrugated lining plate, the conical grading lining plate and the small corrugated lining plate are sequentially paved, so that the large-diameter steel balls and the small-diameter steel balls respectively roll towards the feeding end and the discharging end in the grinding process and respectively play roles in crushing and grinding, the grinding efficiency is greatly improved, the yield and the fineness of the pulverized coal are ensured to reach the standard, the ball loading amount of the steel balls can be reduced, and the cost is saved; in addition, along with the great reduction of the loading capacity, the consumption of the steel balls can be reduced in the daily operation process, compared with the prediction before modification, the consumption is reduced by more than 10%, the operation load of the coal mill is finally reduced, the power consumption is reduced by more than 24%, and the method is favorable for guaranteeing the operation safety of equipment and reducing the maintenance and repair work of the equipment.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a coal mill is swept to wind, includes mill barrel (2), mill barrel (2) both ends are provided with feed arrangement (1) and discharging device (6) respectively, a serial communication port, be provided with welt mechanism on the inner wall of mill barrel (2), welt mechanism is put from the feeding and is held to discharging device (6) and include big wave form welt (3), the hierarchical welt of toper (4) and little wave form welt (5) in proper order, the intussuseption of mill barrel (2) is filled with steel ball (7) that a plurality of diameter is different.

2. An air swept coal mill as claimed in claim 1, characterized in that the steel balls (7) have a diameter comprising 20mm, 30mm, 40mm, 50mm and 60 mm.

3. An air swept coal mill according to claim 2, characterized in that the mix ratio of the steel balls (7) of different diameters is 20 mm: 30 mm: 40 mm: 50 mm: 60 mm-4: 5: 5: 3: 3.

4. an air swept coal mill as claimed in claim 2, characterized in that the steel balls (7) have a surface hardness not lower than 59HRC and a core hardness not lower than 57 HRC.

5. An air swept coal mill according to any of claims 1-3, characterized in that the steel ball (7) filling rate is 15-20%.

6. An air swept coal mill as claimed in claim 1, wherein the small corrugated liner (5) is 1/3-1/2 high with respect to the large corrugated liner (3).

7. An air swept coal mill as claimed in claim 1, characterised in that the length of the conical graded lining plate (4) section is 30-50% of the length of the mill barrel (2).

8. An air swept coal mill according to claim 1, characterized in that a first spiral blade (11) is arranged in the feeding device (1) and a second spiral blade (61) is arranged in the discharging device (6), and the rotation directions of the first spiral blade (11) and the second spiral blade (61) are opposite.

9. An air swept coal mill as claimed in claim 8, wherein the first and second flights (11, 61) are angled at 45-60 ° to the horizontal.