CN220750164U

CN220750164U - Double-inlet double-outlet coal mill suitable for mixing and burning lean coal and bituminous coal

Info

Publication number: CN220750164U
Application number: CN202322471104.8U
Authority: CN
Inventors: 崔建国; 王新阁; 高波; 程瑞声; 高宏光
Original assignee: Shandong Hongqiao New Material Co Ltd
Current assignee: Shandong Hongqiao New Material Co Ltd
Priority date: 2023-09-12
Filing date: 2023-09-12
Publication date: 2024-04-09
Anticipated expiration: 2033-09-12

Abstract

The utility model relates to the technical field of coal mills, in particular to a double-inlet double-outlet coal mill suitable for mixing and burning lean coal and bituminous coal, which comprises a cylinder body and a hot primary air pipe, wherein two ends of the cylinder body are connected with a spiral conveyer; by arranging the cold air pipe, the utility model can reduce the temperature of the bypass air pipe in the process of blowing, not only can improve the coal powder conveying speed, but also can avoid the bituminous coal explosion caused by the overhigh bypass air temperature.

Description

Double-inlet double-outlet coal mill suitable for mixing and burning lean coal and bituminous coal

Technical Field

The utility model relates to the technical field of coal mills, in particular to a double-inlet double-outlet coal mill suitable for blending combustion of lean coal and bituminous coal.

Background

The lean coal boiler is influenced by the characteristics of high sulfur content, large granularity and the like of the coal, the abrasion problems of a pulverizing system and four pipes are very prominent, and the water-cooled wall is severely corroded at high temperature, so that the unit has low load capacity, high auxiliary machine failure rate, large four pipe replacement amount and high production and operation cost. And the market quotation of coal affects, and the lean coal purchase is difficult, has further increased running cost and production pressure.

The lean coal is blended with the bituminous coal with the coal burning index of about 37 percent of volatile matters; the system abrasion can be effectively reduced, the workload of four-pipe replacement and auxiliary machine overhaul is reduced, the running reliability of equipment is improved, and the regional power supply and heat supply stability are effectively ensured. Meanwhile, the bituminous coal has high volatile matter and low sulfur content, is easy to catch fire, and the indexes of nitrogen oxides, sulfur dioxide, fly ash combustibles and the like at the outlet of the boiler after the mixed combustion are obviously reduced, thereby being beneficial to environmental protection parameter control and reducing the standard coal consumption of 2-4 g/KWh of power supply.

The patent with the authorized bulletin number of CN100387349C discloses a double-inlet and double-outlet steel ball coal mill, which has the defects that bypass air is hot air, the air temperature is about 300 ℃, and the bypass air can not be directly opened to improve the coal powder conveying speed due to the characteristics of high volatile matter of bituminous coal, inflammability, explosiveness and the like when the bituminous coal is mixed and burned; however, if the bypass air is not opened, the coal powder conveying speed is too low, the coal powder in the coal dropping pipe is easy to deposit, and the long-time deposited coal powder is easy to oxidize and spontaneous combustion to explode.

Disclosure of Invention

The utility model mainly aims to provide a double-inlet double-outlet coal mill suitable for mixing and burning lean coal and bituminous coal, so as to solve the problem that bypass air cannot be directly opened to improve the coal powder conveying speed when the double-inlet double-outlet steel ball coal mill mixes and burns bituminous coal in the prior art; however, if the bypass air is not opened, the coal powder conveying speed is too low, the coal powder in the coal dropping pipe is easy to deposit, and the long-time deposited coal powder is easy to oxidize and spontaneous combustion to explode.

In order to achieve the aim, the utility model provides a double-inlet double-outlet coal mill suitable for mixing and burning lean coal and bituminous coal, which comprises a cylinder body and a hot primary air pipe, wherein screw conveyors are connected to two ends of the cylinder body, a hot air box is arranged at one end, far away from the cylinder body, of the screw conveyors, the hot primary air pipe is connected with a bypass air pipe and a capacity air pipe, the capacity air pipe is connected with the hot air box, the bypass air pipe is connected with a mixing box, the bottom of the mixing box is connected with a coal dropping pipe, the coal dropping pipe is connected with the bottom of the screw conveyors, the top of the screw conveyors is connected with a separator through a pipeline, and the bypass air pipe is connected with a sealing air pipe through a cold air pipe; the air temperature in the sealed air duct is 30-40 ℃, and the bypass air is reduced to about 100 ℃ by introducing the air in the sealed air duct into the bypass air duct to be mixed with the bypass air, so that the coal powder conveying speed can be improved, and the bituminous coal explosion caused by the overhigh temperature of the bypass air is avoided.

Further, an explosion door is arranged at the top of the hot air box; the pressure of the hot air box position in the coal mill is highest, and an explosion door is additionally arranged at the position, so that people are prevented from being hurt by explosion.

Further, a coal return pipe is connected between the separator and the coal drop pipe.

Further, a raw coal feeder for feeding the mixing box is arranged above the mixing box.

By arranging the cold air pipe, the utility model can reduce the temperature of the bypass air pipe in the process of blowing, not only can improve the coal powder conveying speed, but also can avoid the bituminous coal explosion caused by the overhigh bypass air temperature.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

FIG. 1 is a schematic diagram of an embodiment;

in the figure: 1. a cylinder; 2. a screw conveyor; 3. a hot air box; 4. a hot primary air duct; 5. a bypass air duct; 6. a capacity air duct; 7. a mixing box; 8. a coal dropping pipe; 9. a separator; 10. a cold air pipe; 11. an explosion door; 12. a coal return pipe; 13. raw coal feeder.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 1, according to the embodiment of the utility model, a double-inlet double-outlet coal mill suitable for blending burning of lean coal and bituminous coal is provided, and comprises a barrel 1 and a hot primary air pipe 4, wherein both ends of the barrel 1 are connected with a spiral conveyer 2, one end of the spiral conveyer 2 far away from the barrel 1 is provided with a hot air box 3, the hot primary air pipe 4 is connected with a bypass air pipe 5 and a capacity air pipe 6, the capacity air pipe 6 is connected with the hot air box 3, the bypass air pipe 5 is connected with a mixing box 7, the bottom of the mixing box 7 is connected with a coal dropping pipe 8, the coal dropping pipe 8 is connected with the bottom of the spiral conveyer 2, the top of the spiral conveyer 2 is connected with a separator 9 through a pipeline, a coal returning pipe 12 is connected between the separator 9 and the coal dropping pipe 8, and the bypass air pipe 5 is connected with a sealing air box through a cold air pipe 10; the air temperature in the sealed air duct is 30-40 ℃, and the bypass air is reduced to about 100 ℃ by introducing the air in the sealed air duct into the bypass air duct to be mixed with the bypass air, so that the coal powder conveying speed can be improved, and the bituminous coal explosion caused by the overhigh temperature of the bypass air is avoided.

The explosion-proof door 11 is installed at the top of hot-blast box 3, and the pressure of hot-blast box 3 position is the highest in the coal pulverizer, adds explosion-proof door 11 here, prevents here to explode and hurt the people.

A raw coal feeder 13 for feeding the mixing box 7 is arranged above the mixing box 7.

Before the embodiment is used, the double-inlet and double-outlet coal mill is adopted to conduct the blending combustion of the lean coal and the soft coal, so that the explosion risk is greatly reduced, and the safety of equipment and personnel is ensured.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The utility model provides a two play coal pulverizer of double-inlet suitable lean coal bituminous coal blending, includes barrel (1), hot tuber pipe (4), and the both ends of barrel (1) are connected with screw conveyer (2), and the one end that barrel (1) was kept away from to screw conveyer (2) is equipped with hot-blast box (3), a serial communication port, hot tuber pipe (4) are connected with bypass tuber pipe (5) and capacity tuber pipe (6), hot-blast box (3) are connected in capacity tuber pipe (6), bypass tuber pipe (5) are connected with mixing box (7), the bottom of mixing box (7) is connected with coal dropping pipe (8), the bottom of screw conveyer (2) is connected to coal dropping pipe (8), the top of screw conveyer (2) is through pipe connection separator (9), bypass tuber pipe (5) are through cold wind pipe (10) connection seal wind parent pipe.

2. The double-inlet double-outlet coal mill suitable for blending combustion of lean coal and bituminous coal according to claim 1, wherein the top of the hot air box (3) is provided with an explosion door (11).

3. The double-inlet double-outlet coal mill suitable for blending combustion of lean bituminous coal according to claim 1, wherein a coal return pipe (12) is connected between the separator (9) and the coal drop pipe (8).

4. The double-inlet double-outlet coal mill suitable for blending combustion of lean bituminous coal according to claim 1, wherein a raw coal feeder (13) for feeding the mixing box (7) is arranged above the mixing box (7).