CN211755546U

CN211755546U - Micro-scale stone-discharging dynamic and static ring device for improving output of medium-speed coal mill

Info

Publication number: CN211755546U
Application number: CN201821311318.1U
Authority: CN
Inventors: 刘庆彬
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-08-06
Filing date: 2018-08-06
Publication date: 2020-10-27
Anticipated expiration: 2028-08-06

Abstract

The device 'improves the micro-scale stone-discharging dynamic and static ring device of the medium-speed coal mill' and belongs to the technical field of power station boiler coal mills, and is a dynamic ring and static ring technology applied to HP and RP series coal mills. The design enables the discharge amount of pebble coal of the boiler coal mill per hour to reach the discharge amount of kilogram from the conventional hundred-kilogram level, and meanwhile, the output of the coal mill is greatly improved. The device is characterized in that: the clearance between the moving ring and the static ring of the coal mill is of an upper structure and a lower structure which are adjacent, the static ring is arranged on the upper part of the moving ring, and the moving ring and the grinding bowl of the coal mill are connected up and down.

Description

Micro-scale stone-discharging dynamic and static ring device for improving output of medium-speed coal mill

Technical Field

This device "improve the stone of arranging that medium speed pulverizer exerted force and move quiet ring device" is the utility model discloses a technique of coal pulverizer that can improve the coal pulverizer and exert force belongs to power plant boiler coal pulverizer technical field.

Background

In the existing HP863 and RP903 type coal mill, a dynamic clearance and a static clearance are clearances between a coal mill air ring and a coal mill lining plate, the clearances are vertical, the design value is generally 10mm, the air ring of the coal mill is arranged on the lateral upper part of a grinding bowl, and the upper part of the air ring has a certain distance with the top of the grinding bowl.

This structure has a great problem: 1) because the sound clearance is the vertical direction, the wind that comes out from the clearance is parallel with the wind of wind ring nozzle export, and adjustment sound clearance can only change the wind speed of wind ring export, and indirect influence stone coal stone discharging rate because influence effect is limited, so many enterprises have all reformed transform the wind ring for many years, but the effect is limited, can reduce after the transformation 50% just can not play very much, can't realize or be close to reducing to the unit number, if: huaneng Dalian power plant (power plant 2011, 7 th), and Datang Tashan power plant (2017, 33 th).

2) The change with time and the increase of abrasion, and the discharge amount of the pebble coal is increased. When the abrasion is increased, the stone discharge amount is increased, and the raw coal content in the stone discharge is increased.

3) Because the wind ring rotating ring is arranged at the middle upper part of the side surface of the grinding bowl, all stone coal or particle coal entering the wind ring is difficult to be blown into the grinding bowl again, and the transformation effect can be greatly reduced even if the rotating ring is added and the moving and static gaps are changed into an upper and lower structure.

4) The grinding bowl height of the coal mills of the HP863 and RP903 types is not the optimal height, and the modification space is provided.

SUMMERY OF THE UTILITY MODEL

The key technical scheme of the micro-scale stone-discharging dynamic and static ring device for improving the output of the medium-speed coal mill comprises the following steps: the dynamic and static gaps of the coal mill are of an adjacent upper and lower structure, and the static ring is arranged at the upper part of the dynamic ring; the movable ring and the grinding bowl are connected into an upper structure and a lower structure which are arranged on the upper part of the grinding bowl, the upper part of the grinding bowl is connected, installed and welded and reinforced through bolts, and the installation position of the wind ring is flush with the topmost part of the grinding bowl; the static ring of the coal mill is higher than the grinding bowl and is positioned at the upper part of the grinding bowl; the grinding bowl extends for 20 mm-50 mm.

The design has the characteristics that: 1) the original adjacent vertical structure of the dynamic and static gaps of the coal mill is changed into an adjacent upper and lower structure. The horizontal blowing device has the advantages that the wind from the driven static gap horizontally blows the movable ring of the wind ring, and provides a horizontal thrust force for the pebble coal entering the wind ring, so that most of the pebble coal with smaller gravity is sent into the grinding bowl of the coal mill again, and the stone discharge amount is greatly reduced.

2) The dynamic clearance can be increased along with the aggravation of abrasion, the air leakage quantity can be increased, the horizontal thrust of the air ring can be increased through the dynamic and static clearance air, and therefore the aggravation of the change abrasion along with the time of the design can not obviously increase the stone discharge quantity of the coal mill.

3) The platform has been increased in the design of wind ring rotating ring, the equidistant bolt hole of having arranged on it, the bolt hole generally is phi 32mm, and the hole pitch is the same with the extension ring hole pitch of the coal pulverizer of the same type, changes the mounted position of wind ring into than the grinding bowl height 20 ~ 50mm by being less than, and the advantage of this design can directly sweep the wind ring. The wind level coming out from the dynamic and static gaps sweeps the dynamic ring of the wind ring, and the horizontal thrust is given to the pebble coal entering the wind ring, so that most of the pebble coal with smaller gravity is sent into the grinding bowl of the coal mill again, the stone discharge amount is greatly reduced, and the output of the coal mill is improved.

Drawings

FIG. 1 is a schematic view of a mounting structure of a wind ring of a coal mill according to the design. Wherein 1 is a shell of the coal mill, 2 is a lateral lining plate, 3 is a wind ring static ring, 4 is a wind ring dynamic ring, 5 is a connecting bolt, 6 is a grinding bowl

Fig. 2 is a schematic top view of a stationary ring of the wind ring, and fig. 3 is a schematic front view of the stationary ring of the wind ring. FIG. 4 is a schematic diagram of a top view and a front view of the wind ring moving ring, wherein 7 is a shape table, 8 is a wind ring moving ring nozzle, 9 is a bolt hole

Detailed Description

Installing a static ring at the inner side part of the coal mill by combining the attached drawing, and installing the static ring of the coal mill at the upper part of a movable ring of a wind ring, wherein a dynamic gap and a static gap are of adjacent upper and lower structures; the connection between the movable ring and the grinding bowl is changed into the connection between the movable ring and the grinding bowl, the movable ring and the grinding bowl are arranged on the upper part of the grinding bowl in an up-and-down mode, and the installation position of the reinforcing air ring is flush with the topmost part of the grinding bowl in a connecting mode through bolts on the upper part of the grinding bowl; the grinding bowl can properly extend for 20 mm-50 mm.

The device mainly comprises a movable ring and a stationary ring. The movable ring is divided into a plurality of wear-resistant steel plates with the thickness larger than 20mm and is welded and connected, the movable ring is welded and installed on the shell in a whole circle along the lining plate of the coal mill, an upper structure and a lower structure are arranged between the movable ring and the movable ring, and gaps are reserved between the movable ring and the upper part and the lower part of the movable ring; the movable ring adopts a universal 6-section structure, the nozzles are generally formed by 54 or 48 nozzles, the gap of the nozzles needs to be finely adjusted according to the actual size of each power plant, the nozzles are made of wear-resistant steel materials, the nozzles are connected with a grinding bowl through bolts, welded and reinforced, the bolts utilize original bolts on the extension ring of the grinding bowl, screw holes of built-in nuts are reserved on a wind ring, so that the abrasion of the bolts is reduced, and welded protective sleeves are additionally arranged on the nuts for the convenience of batch processing without the screw holes of the built-in nuts.

Claims

1. The utility model provides an improve middle speed pulverizer and exert oneself trace stone discharge sound ring device, characterized in that:

the gap between the moving ring and the static ring of the coal mill is an adjacent up-down structure, the static ring is arranged on the upper part of the moving ring, the moving ring is arranged on the upper part of the grinding bowl, the grinding bowl is 20 mm-50 mm higher, and the moving ring is arranged on the upper part of the grinding bowl and is directly connected with the grinding bowl.