A hot air duct structure for a coal mill stone coal chamber
By setting up high-temperature insulation cotton, side plates and top plates in the hot air duct structure of the gravel coal chamber of the coal mill, the problem of accumulation of gravel coal in the hot air duct is solved, the risk of spontaneous combustion is reduced, and the safety and economicality of the equipment are improved.
Patent Information
- Application Number
- CN202420809144.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-04-18
AI Technical Summary
The accumulation of gravel coal in the coal mill in the hot air duct, resulting in a decrease in the hot air traffic area and may cause spontaneous combustion or fire, affecting the safety and economics of the equipment.
A hot air duct structure of a coal grinder gravel chamber is designed. By setting up high-temperature insulation cotton, side plates and top plates at the hot air outlet, the top plate is higher than the scraper and extends inclinedly, covering the end of the scraper, reducing the probability of gravel coal entering the hot air duct, and driving the gravel coal to roll back into the gravel coal chamber through the hot air action.
Effectively block the gravel coal that bounces during the scraper cleaning process, reduces the accumulation of gravel coal at the hot air outlet, reduces the risk of spontaneous combustion, and improves the safety and operational economy of the equipment.
Smart Images
Figure CN222694892U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of coal mill structures, and in particular relates to a hot air duct structure of a stone coal chamber of a coal mill. Background Art
[0002] During the operation of the coal mill, the debris in the coal that is difficult to break, such as iron blocks and stone coal, cannot be carried away by the airflow. They fall into the stone coal chamber at the bottom of the grinding bowl through the impeller device. Four scrapers are symmetrically installed at the bottom of the grinding bowl to scrape the debris in the stone coal chamber into the stone coal box for storage and regular discharge. The lower surface of the inlet hot air duct currently used in the stone coal chamber of the coal mill is designed to be highly flush with the upper surface of the stone coal scraper. Under the cleaning of the stone coal scraper and the action of centrifugal force, some of the stone coal is "thrown" into the inlet hot air duct and accumulated. In the long run, the stone coal accumulated in the hot air duct not only reduces the effective passage area of the hot air, but also the stone coal accumulated in the hot air duct is very easy to spontaneously combust under long-term high temperature environment. In severe cases, it may cause the coal mill to explode or burn through the bottom plate of the hot air duct to form a fire, affecting the safety of equipment operation and the economy of unit operation. Utility Model Content
[0003] Aiming at the technical problem of pebble coal accumulation in the existing hot air duct structure of the pebble coal chamber of the coal mill, the utility model provides a hot air duct structure of the pebble coal chamber of the coal mill, which can effectively block the pebble coal bouncing during the scraper cleaning process.
[0004] The utility model provides a hot air duct structure of a stone coal chamber of a coal mill, comprising a stone coal chamber, a grinding bowl shaft, a scraper and a hot air pipe, the grinding bowl shaft is located in the stone coal chamber, the scraper is connected to the outer circumference of the grinding bowl shaft, the bottom surface of the scraper abuts against the bottom surface of the stone coal chamber, the bottom of the stone coal chamber is provided with a slag outlet, the side wall of the stone coal chamber is provided with a hot air outlet, the hot air pipe is connected to the hot air outlet, and high-temperature resistant heat-insulating cotton, side plates and top plates are provided at the hot air outlet, the side plates are vertically arranged on the inner sides of the side walls of the stone coal chamber, the top plate is located on the top of the side plates, the top plate is higher than the scraper, and the top plate extends obliquely downward from the hot air pipe to the stone coal chamber, the top plate at least partially extends out of the top of the side plates and covers the top of the end of the scraper, and the high-temperature resistant heat-insulating cotton is filled between the bottom surface of the hot air pipe, the side plates and the top plate.
[0005] Furthermore, there are multiple scrapers, and the multiple scrapers are arranged at intervals on the outer circumference of the grinding bowl shaft.
[0006] Furthermore, a slag discharge pipe is connected below the slag discharge port.
[0007] The hot air duct structure of the pebble coal chamber of the coal mill is provided with high-temperature resistant heat-insulating cotton, side panels and top panels at the position of the hot air outlet; the top panel is supported by the side panels so that the top panel is higher than the scraper, thereby reducing the probability of pebble coal entering the hot air pipe due to the scraper action; the high-temperature resistant heat-insulating cotton can improve the impact resistance of the side panels; at the same time, the top panel is at least partially extended out of the top of the side panel and covers the top of the scraper end, thereby further reducing the bouncing problem of pebble coal at the hot air outlet caused by the cleaning action of the scraper end; the top panel is inclined, so even if pebble coal falls onto the top panel, it is beneficial for the hot air to drive the pebble coal to roll back into the pebble coal chamber. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0009] Figure 1 The present invention is a structural schematic diagram of a hot air duct structure of a coal mill pebble coal chamber. DETAILED DESCRIPTION
[0010] The utility model discloses a hot air duct structure of a coal mill stone coal chamber. The hot air duct structure of the coal mill stone coal chamber can effectively block the stone coal bouncing during the cleaning process of a scraper.
[0011] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, what is described is only a part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0012] See also Figure 1As shown, the utility model discloses a hot air duct structure of a coal mill stone coal chamber, including a stone coal chamber 2, a grinding bowl shaft 1, a scraper 7 and a hot air pipe 8, the grinding bowl shaft 1 is located in the stone coal chamber 2, the scraper 7 is connected to the outer periphery of the grinding bowl shaft 1, the bottom surface of the scraper 7 abuts against the bottom surface of the stone coal chamber 2, the bottom of the stone coal chamber 2 is provided with a slag outlet 9, the side wall of the stone coal chamber 2 is provided with a hot air outlet 3, the hot air pipe 8 is connected to the hot air outlet 3, and the hot air outlet 3 is provided High temperature resistant heat preservation cotton 5, side panels 6 and top panels 4 are provided. The side panels 6 are vertically arranged on the inner side of the side wall of the stone coal chamber 2. The top panel 4 is located on the top of the side panels 6. The top panel 4 is higher than the scraper 7. The top panel 4 extends obliquely downward from the hot air pipe 8 to the stone coal chamber 2. The top panel 4 at least partially extends out of the top of the side panel 6 and covers the top of the end of the scraper 7. The high temperature resistant heat preservation cotton 5 is filled between the bottom surface of the hot air pipe 8, the side panels 6 and the top panel 4.
[0013] There are multiple scrapers 7 , and the multiple scrapers 7 are arranged at intervals on the outer circumference of the grinding bowl shaft 1 .
[0014] A slag discharge pipe 10 is connected below the slag discharge port 9 .
[0015] The hot air duct structure of the pebble coal chamber of the coal mill is provided with high-temperature resistant heat-insulating cotton 5, side panels 6 and top panel 4 at the position of the hot air outlet 3. The top panel 4 is supported by the side panels 6 so that the position of the top panel 4 is higher than the scraper 7, thereby reducing the probability of the pebble coal entering the hot air pipe 8 due to the action of the scraper 7. The high-temperature resistant heat-insulating cotton 5 can improve the impact resistance of the side panels 6. At the same time, the top panel 4 is at least partially extended out of the top of the side panels 6 and covers the top of the end of the scraper 7, thereby further reducing the bouncing problem of the pebble coal at the hot air outlet 3 caused by the cleaning action of the end of the scraper 7. The top panel 4 is inclined, so even if the pebble coal falls on the top panel 4, it is also conducive to driving the pebble coal to roll back to the pebble coal chamber 2 through the action of the hot air.
[0016] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A hot air duct structure of a coal mill stone coal chamber, characterized in that: The invention comprises a stone coal chamber, a grinding bowl shaft, a scraper and a hot air pipe, wherein the grinding bowl shaft is located in the stone coal chamber, the scraper is connected to the outer circumference of the grinding bowl shaft, the bottom surface of the scraper abuts against the bottom surface of the stone coal chamber, the bottom of the stone coal chamber is provided with a slag outlet, the side wall of the stone coal chamber is provided with a hot air outlet, the hot air pipe is connected to the hot air outlet, and high-temperature resistant heat-insulating cotton, side panels and top panels are provided at the hot air outlet, the side panels are vertically arranged on the inner side of the side walls of the stone coal chamber, the top panel is located on the top of the side panels, the top panel is higher than the scraper, and the top panel extends obliquely downward from the hot air pipe to the stone coal chamber, the top panel at least partially extends out of the top of the side panel and covers the top of the end of the scraper, and the high-temperature resistant heat-insulating cotton is filled between the bottom surface of the hot air pipe, the side panels and the top panel.
2. A coal mill stone coal chamber hot air duct structure according to claim 1, characterized in that: There are multiple scrapers, and the multiple scrapers are arranged at intervals on the outer circumference of the grinding bowl rotating shaft.
3. A coal mill stone coal chamber hot air duct structure according to claim 1, characterized in that: A slag discharge pipe is connected below the slag discharge port.