CN217663656U

CN217663656U - Plugging structure of pre-buried weldable steel sheet of wear-resisting rotating ring of coal pulverizer

Info

Publication number: CN217663656U
Application number: CN202220056520.4U
Authority: CN
Inventors: 张永亮; 孙志强; 付福军; 马建兵; 臧利永; 陈志军; 范国强; 崔斌
Original assignee: Beijing Lad Electric Technology Co ltd; Inner Mongolia Jingning Thermal Power Co ltd; Beijing Jingneng Power Co Ltd
Current assignee: Beijing Lad Electric Technology Co ltd; Inner Mongolia Jingning Thermal Power Co ltd; Beijing Jingneng Power Co Ltd
Priority date: 2022-01-11
Filing date: 2022-01-11
Publication date: 2022-10-28
Anticipated expiration: 2032-01-11

Abstract

The utility model relates to a pre-buried block structure who welds steel sheet of wear-resisting rotating ring of coal pulverizer, it includes: a moving ring air channel is formed between two adjacent blades on the moving ring of the coal mill. The inner sides of the two adjacent blades are respectively provided with an embedded steel plate; and the plugging steel plates are welded with the embedded steel plates respectively, no gap exists between the steel plates, so that the moving ring air passage is plugged completely, and the whole air volume is adjusted by adjusting the total flow area of the moving ring air passage. The utility model discloses can improve the speed of flow in coal pulverizer rotating ring exit through the regulation of rotating ring air flue total area, improve once wind and send whitewashed efficiency to improve the adaptability of coal pulverizer to different coal types and operating mode. The primary air outlet area is changed at any time according to the change of the working condition of the coal pulverizing system, the primary air adjusting range is expanded, the purposes of improving the output, the current and the inlet-outlet differential pressure of the coal mill under different working conditions can be realized, the primary air efficiency is improved, the power consumption of an auxiliary machine is reduced, and the maintenance cost is reduced.

Description

Plugging structure of pre-buried weldable steel sheet of wear-resisting rotating ring of coal pulverizer

Technical Field

The utility model relates to the field of machinary, especially indicate a coal pulverizer wear-resisting rotating ring is pre-buried to weld the block structure of steel sheet.

Background

The medium speed vertical coal mill is one of the main equipments of coal-fired power plant. The coal mill provides pulverized coal fuel for the boiler, and has a series of functions of grinding, drying, screening, primary separation, conveying pulverized coal and the like. The main working process is as follows: raw coal falls into the center of the rotary grinding disc from the coal dropping pipe; the coal powder enters a grinding track of the grinding roller and the grinding disc under the action of centrifugal force and is rolled and ground into coal powder; the coal dust is dried by primary hot air sprayed from the driven ring and spirally rises clockwise to be sent into a separator for separation and screening; feeding the pulverized coal with smaller fineness into a hearth, and returning the pulverized coal with thicker fineness to a grinding area; the pebble coal which is difficult to grind falls into the primary air chamber through the throat of the movable ring, is carried into the slag discharging box by the scraper plate and is finally discharged through the slag discharging door.

It follows that the primary air plays a crucial role in the powdering operation. In order to reasonably organize primary air, a moving ring (also called an air ring, an impeller, a nozzle and the like) is arranged outside a grinding disc of the coal mill. As shown in the attached figure 1, a rotating ring air channel 3 'is formed between two adjacent blades 2' on a rotating ring 1', and primary air enters a coal mill through the rotating ring air channel 3'. The primary wind speed after passing through the moving ring is increased, and the circumferential and radial sub-speeds are obtained at the same time, and the obtained mixture is fully mixed with the pulverized coal and then enters a powder feeding pipeline through a separator.

However, the primary air system currently has the following problems: the outlet of the moving ring air passage of the coal mill is greatly abraded by primary air and coal powder, and after the wear-resistant material of high-chromium alloy is adopted, although the abrasion problem is relieved, the high-chromium alloy can not be further processed by heat. And the domestic coal pulverizing system has complex and changeable working conditions, such as the change of coal types, the change of loads and the like. The requirement of the pulverizing system for primary air volume can be greatly changed, but the area of the outlet of the movable ring air channel of the coal mill is invariable. If the primary air volume is reduced too much, the primary air speed at the outlet of the rotating ring is necessarily reduced, so that a series of problems of reduction of the coal dust lifting capacity of the primary air, increase of the circulating multiplying power of the pulverized coal in the mill, reduction of the screening capacity of pebble coal and the like are caused.

Disclosure of Invention

An object of the utility model is to overcome prior art not enough and provide a pre-buried block structure who welds steel sheet of wear-resisting rotating ring of coal pulverizer, it is one kind and organizes the part of optimizing to wind, and adaptable coal quality for burning changes, load change under the condition that does not influence the wind outlet wind speed of rotating ring, increases the adjustment range of wind. The utility model discloses easy maintenance adjusts simply, has improved equipment operating efficiency, reduces the equipment energy consumption, reduces the maintenance cost.

The technical scheme of the utility model is that:

the utility model provides a pre-buried block structure who welds steel sheet of wear-resisting rotating ring of coal pulverizer, includes that the steel sheet is used in pre-buried steel sheet and shutoff on wear-resisting rotating ring of coal pulverizer, the wear-resisting rotating ring of coal pulverizer, its characterized in that: the movable ring rotates along with the grinding disc, and primary air can be organized to enter an internal flow field of the coal mill; a weldable steel plate is pre-embedded on the wear-resistant movable ring; part of the outlet of the moving ring air passage can be selectively plugged according to the change of the operation working conditions such as unit load, coal type and the like; or the blocked air duct opening is cut, and the primary air quantity is adjusted under the condition of meeting the requirement of the primary air outlet air speed.

The utility model provides a pre-buried block structure who welds steel sheet of wear-resisting rotating ring of coal pulverizer, it includes: a moving ring air passage is formed between two adjacent blades on a moving ring of the coal mill, and the moving ring air passage is characterized in that; the inner sides of the two adjacent blades are respectively provided with an embedded steel plate; the plugging steel plates are respectively welded with the embedded steel plates, no gap is left between the steel plates, and the moving-ring air passage is completely plugged; the whole air quantity can be adjusted by adjusting the total flow area of the movable ring air passage.

Selecting whether to block the moving-ring air passage according to actual conditions; or the blocked moving ring air passage is cut into an opening, so that the ventilation area of the moving ring air passage meets the requirement of equipment operation.

According to the requirement of the plugging area, part of the steel plates can be plugged.

And cutting an opening on the plugging steel plate according to the plugging area requirement.

According to the requirement of the plugging area, the opening area is adjusted by cutting the plugging steel plate, and the plugging quantity and the plugging area can be adjusted according to the change of the operating condition.

The number of the moving ring air passages embedded with the embedded steel plates can be set according to design requirements.

The proportion of the moving ring air passage of the embedded steel plate in the total moving ring is 30%, and the flow speed adjusting range of the moving ring outlet can be controlled to be 0-42%.

The movable ring of the coal mill is made of wear-resistant high-chromium alloy.

The movable ring of the coal mill and the embedded steel plate on the movable ring are fused and cast into a whole. The number of the moving ring air passages additionally provided with the plugging structures can be set according to the requirement when the actual working condition changes. Firstly, according to the requirement of reducing air volume, scientifically calculating and determining the shielding area. And then the number and the plugging area of the plugs are determined according to the number and the area of the actual air passages, so that the whole circle is uniformly distributed.

Can change a wind outlet area through adjustment shutoff quantity and shutoff area according to the change of powder process system load, coal type information, the wind channel quantity of pre-buried weldable steel sheet accounts for 30% of total wind channel quantity, and the adjustment range is 0% to 30% of area of flow promptly, and the outlet velocity of flow of rotating ring control range is 0% to 42%.

The utility model has the advantages of: the utility model discloses can improve the speed of flow in coal pulverizer rotating ring exit through the regulation of rotating ring air flue total area, improve once and send whitewashed efficiency to improve the adaptability of coal pulverizer to different coal types and operating mode. The primary air outlet area is changed at any time according to the working condition change of the coal pulverizing system, the primary air adjusting range is expanded, the purposes of improving the output, the current and the inlet-outlet differential pressure of the coal mill under different working conditions are finally achieved, the primary air efficiency is improved, the power consumption of auxiliary machines is reduced, and the maintenance cost is reduced. The utility model discloses can effectively prolong the life of coal pulverizer rotating ring, can solve the unable problem along with load, the real-time automatic adjustment of coal volume change of the once air volume control of powder process system. The utility model discloses simple structure, the installation and the regulation of being convenient for can stop to grind the regulation at any time. The utility model discloses implement the easy operation of adjusting work, later maintenance is convenient.

Drawings

FIG. 1 is a schematic structural view of a moving ring part of a prior art coal grinding machine.

Fig. 2 is the schematic structural diagram of the non-plugging state of the pre-buried weldable steel plate of the moving ring of the coal mill of the utility model.

Fig. 3 is the schematic diagram of the plugging state of the moving ring of the coal mill of the present invention.

Fig. 4 is a schematic top view of the non-blocking state of the moving ring of the coal mill of the present invention.

Fig. 5 is a schematic plan view of the plugging state of the movable ring of the coal mill according to the present invention.

Fig. 6 is a schematic plan view of the plugging state of the dynamic ring part of the coal mill of the present invention.

The reference numbers indicate:

a movable ring 1, 1'; moving ring blades 2, 2'; moving-ring air passages 3, 3'; pre-burying steel plates 4 and 4'; and (5) plugging the steel plate.

Detailed Description

The invention is further described with reference to the drawings and examples.

As shown in fig. 3, the utility model relates to a blocking structure of the pre-buried steel sheet that can weld of wear-resisting rotating ring of coal pulverizer, it includes: a moving ring air flue 3 is formed between two adjacent blades 2 and 2' on a moving ring 1 of the coal mill, and is characterized in that; the inner sides of the two adjacent blades 2 and 2 'are respectively provided with an embedded steel plate 4 and an embedded steel plate 4'; and the plugging steel plate 5 is respectively welded with the pre-buried steel plates 4 and 4' together, no gap is left between the steel plates, and the moving ring air flue 3 is completely plugged so as to adjust the whole air volume by adjusting the total flow area of the moving ring air flue 3.

As shown in fig. 2 and 4, the occluding structure of the present invention is in an unblocked state.

The structure shown in fig. 3 and 5 is in a blocking state, that is, the blocking steel plate 5 is welded with the pre-buried steel plates 4 and 4' to completely block the moving ring air passage 3.

As shown in fig. 6, the plugging structure of the present invention is in a partially plugged state. According to the requirement of the plugging area, plugging part of the steel plate 5; or an opening is cut on the plugging steel plate, so that the adjustment is more precise.

Claims

1. The utility model provides a shutoff structure of pre-buried steel sheet that welds of wear-resisting rotating ring of coal pulverizer, includes pre-buried steel sheet and the shutoff steel sheet that welds on wear-resisting rotating ring of coal pulverizer, the wear-resisting rotating ring of coal pulverizer, its characterized in that: the movable ring rotates along with the grinding disc, and primary air can be organized to enter an internal flow field of the coal mill; a weldable pre-buried steel plate is arranged on the wear-resistant movable ring; part of the outlet of the moving ring air passage can be selectively plugged according to the change of the unit load and the operation condition of the coal; or the blocked air duct opening can be cut off, and the primary air quantity is adjusted under the condition of meeting the requirement of the primary air outlet air speed.

2. The utility model provides a pre-buried block structure who welds steel sheet of wear-resisting rotating ring of coal pulverizer, it includes: a moving ring air passage is formed between two adjacent blades on a moving ring of the coal mill, and the moving ring air passage is characterized in that; the inner sides of the two adjacent blades are respectively provided with an embedded steel plate; and the plugging steel plates are respectively welded with the embedded steel plates together, no gap is left between the steel plates, and the moving ring air passage is completely plugged.

3. The plugging structure of the pre-buried weldable steel plate of the wear-resisting movable ring of the coal mill as claimed in claim 1 or 2, is characterized in that: according to the requirement of the plugging area, part of the steel plates can be plugged.

4. The plugging structure of the pre-buried weldable steel plate of the wear-resisting movable ring of the coal mill as claimed in claim 1 or 2, is characterized in that: and cutting an opening on the plugging steel plate according to the plugging area requirement.

5. The plugging structure of the pre-buried weldable steel plate of the wear-resisting movable ring of the coal mill as claimed in claim 1 or 2, is characterized in that: the embedded steel plate is provided with air passages, and the number of the air passages can be set according to design requirements.

6. The plugging structure of the pre-buried weldable steel sheet of the wear-resisting movable ring of the coal mill as claimed in claim 5, is characterized in that: the air passage of the embedded steel plate accounts for 30% of the total moving ring, and the flow speed adjusting range of the moving ring outlet can be controlled to be 0% -42%.

7. The plugging structure of the pre-buried weldable steel plate of the wear-resisting moving ring of the coal mill as claimed in claim 1 or 2, characterized in that: the movable ring of the coal mill is made of wear-resistant high-chromium alloy.

8. The plugging structure of the pre-buried weldable steel plate of the wear-resisting movable ring of the coal mill as claimed in claim 1 or 2, is characterized in that: the movable ring of the coal mill and the embedded steel plate on the movable ring are fused and cast into a whole.