A coal mill air ring device suitable for discharging dirt such as mud and sand from applicable coal

Abstract

The application discloses a coal mill air ring device suitable for discharging mud, sand and other sundries in applicable coal, which comprises a coal mill cylinder, a static ring fixedly arranged in the coal mill cylinder, a polishing cylinder arranged in the static ring, a dynamic ring arranged on the outer side of the polishing cylinder, a wind baffle arranged on the outer side of the dynamic ring, self-adjusting axial sealing baffles arranged at the bottom between the wind baffle and the static ring, a mud and sand discharging channel arranged in the middle between the wind baffle and the static ring, and self-adjusting axial sealing baffles each comprising a plurality of blades and a limiting piece, wherein the middle of the limiting piece is fixedly connected with one end of the blade, and the limiting piece comprises two limiting shaft seats and an adjusting shaft. The application designs the structure of the coal mill air ring, increases the sundry discharging device for automatically discharging mud and sand, improves the sealing performance of the coal mill air ring, reduces the air leakage of the coal mill air ring, and finally realizes the stable operation of the coal mill and improves the output of the coal mill.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mills, in particular to a wind ring device for a coal mill suitable for discharging mud, sand and other impurities in the coal. BACKGROUND

[0002] The working principle of a medium-speed coal mill is that the hot air flowing in opposite directions at the throat of the wind ring collides with the falling stone coal, thereby holding or blowing up a large amount of coal with small density, and separating and blowing up the fine coal powder, which is then further separated by a separator and enters a coal powder pipeline.

[0003] When the wind ring of the coal mill is normally working, the stone coal and other impurities that are not ground are thrown to the throat of the wind ring, and when the hot air from below is not enough to prevent them from falling, the stone coal falls to the stone coal box through the wind ring.

[0004] However, the traditional coal mill has the following disadvantages:

[0005] At present, due to large changes in coal quality and an increase in the amount of mud and sand in the coal, the hot air from below blows up part of the mud and sand, the suspended sand layer affects the separation efficiency of the coal powder, and the output of the coal mill is insufficient; in order to solve the problem of sand suspension, the pressure difference must be changed, and the mill needs to be shaken multiple times a day, otherwise the mill will be blocked, directly affecting the safe and stable operation of the boiler. SUMMARY

[0006] The purpose of the present application is to provide a wind ring device for a coal mill suitable for discharging mud, sand and other impurities in the coal, to solve the problem of insufficient output of the coal mill caused by the hot air from below blowing up part of the mud and sand, the suspended sand layer affecting the separation efficiency of the coal powder, and the mill being blocked due to the change in pressure difference and the need to shake the mill multiple times a day, which directly affects the safe and stable operation of the boiler.

[0007] To achieve the above purpose, the present application provides the following technical scheme: a wind ring device for a coal mill suitable for discharging mud, sand and other impurities in the coal, comprising a coal mill cylinder, a static ring fixedly installed inside the coal mill cylinder, a dynamic ring provided inside the static ring, a wind ring installed on the outside of the dynamic ring, a self-adjusting axial sealing baffle installed at the bottom between the wind ring and the static ring, a mud and sand discharge channel provided in the middle between the wind ring and the static ring, each of the two self-adjusting axial sealing baffles comprising a plurality of blades and a limiting piece, the middle of the limiting piece being fixedly connected to one end of the blade, and the limiting piece comprising two limiting shaft seats and an adjusting shaft, the opposite ends of the two limiting shaft seats being fixedly connected to the two ends of the adjusting shaft.

[0008] As a preferred technical scheme of the present application, the middle part of the adjusting shaft is fixedly connected with the blade, the top end of the limiting shaft seat is fixedly connected with the side of the static ring opposite to the side of the static ring facing the wind ring, and the self-adjusting axial sealing baffle is installed on the static ring through the limiting shaft seat.

[0009] As a preferred technical scheme of the present application, the blade is located below the static ring, and the side of the top end of the blade is in contact with the side of the wind ring opposite to the side of the wind ring facing the static ring.

[0010] When the weight of the accumulated silt is greater than the lifting pressure generated by the hot air blown from bottom to top, the blade in the self-adjusting axial sealing baffle is angularly deflected relative to the wind ring, so as to open the self-adjusting axial sealing baffle, and the silt falls out. After the silt falls out, the lifting pressure of the hot air blown from bottom to top is greater than the weight of the blade in the self-adjusting axial sealing baffle, so as to lift the blade to reset and close the self-adjusting axial sealing baffle.

[0011] Compared with the prior art, the present application has the following beneficial effects:

[0012] The structure of the wind ring of the coal mill is designed, the device for automatically discharging silt and sand is added, the sealing performance of the wind ring of the coal mill is improved, the air leakage of the wind ring of the coal mill is reduced, and finally the stable operation of the coal mill and the output of the coal mill are improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 Fig. 1 is a schematic view of the inside of the coal mill cylinder of the present application;

[0014] Figure 2 Fig. 3 is a sectional view of the coal mill cylinder of the present application;

[0015] Figure 3 Fig. 6 is an enlarged schematic view of the position A of the present application;

[0016] Figure 4 Fig. 9 is a partial schematic view of the present application;

[0017] Figure 5 Fig. 11 is a side view of the self-adjusting axial sealing baffle of the present application;

[0018] In the figure: 1, coal mill cylinder; 2, self-adjusting axial sealing baffle; 3, moving ring; 4, static ring; 5, silt discharge channel; 6, wind ring; 7, limiting shaft seat; 8, adjusting shaft; 9, blade; 11, limiting member. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application.

[0020] Please refer to Figures 1-5 The present application provides a coal mill air ring device suitable for discharging mud, sand and other impurities in applicable coal, comprising a coal mill cylinder 1, a static ring 4 fixedly installed inside the coal mill cylinder 1, a dynamic ring 3 arranged inside the static ring 4, a wind baffle 6 installed on the outside of the dynamic ring 3, a self-adjusting axial sealing baffle 2 installed at the bottom between the wind baffle 6 and the static ring 4, a mud and sand discharge channel 5 arranged in the middle between the wind baffle 6 and the static ring 4, and two self-adjusting axial sealing baffles 2 each comprising a plurality of blades 9 and a limiting piece 11, the middle of the limiting piece 11 being fixedly connected with one end of the blade 9, the limiting piece 11 comprising two limiting shaft seats 7 and an adjusting shaft 8, and the opposite ends of the two limiting shaft seats 7 being fixedly connected with the two ends of the adjusting shaft 8.

[0021] The middle of the adjusting shaft 8 is fixedly connected with the blade 9, and the top end of the limiting shaft seat 7 is fixedly connected with the side of the static ring 4 opposite to the side facing the wind baffle 6, and the self-adjusting axial sealing baffle 2 is installed on the static ring 4 through the limiting shaft seat 7.

[0022] The blade 9 is located below the static ring 4, and the side of the top end of the blade 9 is in contact with the side of the wind baffle 6 opposite to the side facing the static ring 4. When the weight of the accumulated mud and sand is greater than the lifting pressure generated by the hot air blown from bottom to top, the blade in the self-adjusting axial sealing baffle is angularly deflected relative to the wind baffle, thereby opening the self-adjusting axial sealing baffle, and the mud and sand fall off. After the mud and sand fall off, the lifting pressure of the hot air blown from bottom to top is greater than the weight of the blade of the self-adjusting axial sealing baffle, thereby lifting the blade to reset and close the self-adjusting axial sealing baffle.

[0023] In the application, a circle of wind baffle 6 is newly added outside the blade 9 of the wind ring moving ring 3, a certain gap is left between the wind baffle 6 and the wind ring static ring 4 as the discharge channel of mud, sand and other impurities, the interval is 6-9mm, the circumferential sealing is realized, the self-adjusting axial sealing baffle 2 is newly designed and installed at the inner side of the static ring 4, when the coal mill starts to run, due to the wind pressure of the inlet air chamber at the bottom of the coal mill, the gap self-adjusting axial sealing baffle 2 is in the closed state, the axial interval between the self-adjusting axial sealing baffle 2 and the inlet edge of the wind ring moving baffle 6 is 2-3mm, the axial sealing is realized, the flow of the primary air which directly enters the grinding area and mixes with the coal powder without adjustment through the wind ring device can be reduced, when the grinding disc rotates during the work of the coal mill, the mud, sand and other impurities are blown to the outer edge of the wind ring moving ring by the centrifugal force and enter the gap, the mud, sand and other impurities are guided to the gap by the baffle of the static ring 4, the mud, sand and other impurities enter the gap by gravity, start to deposit, when the deposited weight of the mud, sand and other impurities is greater than the inlet wind lifting pressure of the gap axial sealing baffle at the bottom of the coal mill, the sealing baffle opens downward, the mud, sand and other impurities are discharged from the gap channel and directly enter the bottom air chamber of the coal mill and are discharged from the coal mill through the stone coal system, the mud, sand and other impurities in the coal mill are discharged timely and quickly, the problem of the suspension of the mud, sand and other impurities in the coal mill is solved, the safe and stable operation of the coal mill is realized, after the mud, sand and other impurities are discharged timely and quickly, the self-adjusting axial sealing baffle 2 is lifted and closed under the action of the inlet wind lifting pressure of the bottom air chamber, the periodic discharge of the mud, sand and other impurities in the coal mill is realized, the problem that the mud, sand and other impurities can be removed only when the coal mill stops running is solved, the continuous and efficient operation of the coal mill is ensured, the mud, sand and other impurities can slide down along the gap discharge channel and accumulate in the gap discharge channel with the self-adjusting axial sealing baffle 2 as the bottom support, the self-adjusting gap sealing baffle adjusting axial sealing baffle is provided with a limiting device, including a limiting shaft seat 7 and an adjusting shaft 8, the opening angle of the self-adjusting axial sealing baffle 2 is 0°-60°, the self-adjusting axial sealing baffle 2 is composed of 12-36 blades 9, each blade 9 is matched with a corresponding limiting device, the limiting part 11 is composed of the limiting shaft seat 7 with a groove and the adjusting shaft 8 with an end block, when the blade 9 is turned over, the groove of the limiting shaft seat 7 limits the rotation angle of the block of the adjusting shaft 8, so as to control the opening degree of the baffle, the self-adjusting axial sealing baffle 2 realizes the opening and closing of the baffle according to the weight difference of the mud and sand and the inlet wind lifting pressure, when the weight of the mud and sand is greater than the inlet wind lifting pressure, the baffle is opened; when the weight of the mud and sand is less than the inlet wind lifting pressure, the baffle is closed, when the self-adjusting axial sealing baffle 2 is in the closed state, the self-adjusting axial sealing baffle 2 returns to the horizontal position, the limiting cooperation between the self-adjusting axial sealing baffle 2 and the static ring 4 and the limiting shaft seat 7 can ensure the cooperation gap between the self-adjusting axial sealing baffle 2 and the moving ring 3, so as to prevent the scraping between the self-adjusting axial sealing baffle 2 and the moving ring 3 during the operation, the flow of the primary air after adjustment through the wind ring device is improved, and the coal mill discharge efficiency is improved.

[0024] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A coal mill air ring device suitable for discharging mud, sand and other impurities from coal, comprising a coal mill barrel (1), characterized in that: The inside of the coal mill barrel (1) is fixedly provided with a static ring (4), the inside of the static ring (4) is provided with a dynamic ring (3), the outside of the dynamic ring (3) is provided with a wind baffle ring (6), the bottom between the wind baffle ring (6) and the static ring (4) is provided with a self-adjusting axial sealing baffle (2), the middle between the wind baffle ring (6) and the static ring (4) is provided with a mud and sand discharging channel (5), the self-adjusting axial sealing baffle (2) comprises a plurality of blades (9) and limiting members (11), the limiting member (11) comprises two limiting shaft seats (7) with grooves and an adjusting shaft (8) with an end baffle, the opposite ends of the two limiting shaft seats (7) are fixedly connected with the two ends of the adjusting shaft (8) respectively, the middle of the adjusting shaft (8) is fixedly connected with the blade (9), when the blade (9) is turned over, the groove of the limiting shaft seat (7) limits the rotation angle of the adjusting shaft baffle, thereby controlling the opening of the baffle.

2. A wind ring device for a coal mill suitable for discharging the mud and sand impurities in the coal according to claim 1, characterized in that: The top end of the limiting shaft seat (7) is fixedly connected with the side of the static ring (4) opposite to the side facing.

3. A wind ring device for a coal mill for discharging the mud and sand impurities in the coal according to claim 1, characterized in that: The blade (9) is located below the static ring (4), and the side of the top end of the blade (9) opposite to the side facing the wind baffle ring (6) is in contact with the side of the wind baffle ring (6) opposite to the side facing.

Images