Coal mill for boiler of thermal power plant
By using motor-driven rotary rings and rollers in coal mills for thermal power plants, and using a toner filter to separate slag and constant temperature air exchange to prevent hydrocondensation, the slag pollution and toner storage problems in coal mills are solved. Improves power generation efficiency and environmental safety.
Patent Information
- Application Number
- CN202420750805.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-12
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-12
AI Technical Summary
In thermal power plants, coal mills have problems such as doping slag into coal powder causes environmental pollution and reduced power generation efficiency, as well as the problem that coal powder is prone to combine with the hydrocondensation gas in the air during storage.
A coal mill for boiler of thermal power plant was designed, using motor-driven gear to drive the rotating ring and roller for multiple crushing, and the slag was separated by the toner filter in the collection box, and combined with a constant temperature air exchange on the coal storage silo to prevent carbon. The powder combines with hydrocondensation gas.
Effectively separate the carbon powder and slag, improve the power generation efficiency, and prevent the carbon powder from being combined with hydrocondensed gas during storage, solving the problems of environmental pollution and reduced power generation efficiency.
Smart Images
Figure CN222152251U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of mechanical coal grinding, in particular to a coal grinding machine for a boiler in a thermal power plant. Background Art
[0002] The function of the coal mill is to grind the original coal blocks into fine powder particles suitable for combustion through a process of abrasion and crushing, so as to improve the combustion efficiency and calorific value of coal. The coal mill in a thermal power plant plays a vital role in the fuel preparation system of a thermal power plant and is one of the key equipment to ensure the normal operation and power generation efficiency of a thermal power plant.
[0003] Coal mills are high-energy-consuming equipment in all coal-fired power plants. The ground carbon powder is often mixed with slag brought in by the coal. Coal powder often leaks from the coal mill, causing environmental pollution. At the same time, during the storage process, coal powder is easily combined with hydrocondensable gas in the air to form lumps, affecting the power generation efficiency. Utility Model Content
[0004] In order to make up for the above shortcomings, the utility model provides a coal mill for a thermal power plant boiler, aiming to improve the problem that the ground carbon powder is often mixed with slag brought in by coal, the coal powder will pollute the environment, and the coal powder is easily combined with hydrocondensable gas in the air to form blocks during storage.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coal mill for a boiler in a thermal power plant, comprising a coal mill body, a feed inlet is provided on the top of the coal mill body, a material guide funnel is placed below the feed inlet, a plurality of fixed rods are fixedly connected around the bottom of the inner wall of the coal mill body, a plurality of fixed rods are connected to the tops of the fixed rods, a first drive motor is fixedly connected to the top of the fixed ring, a gear is fixedly connected to the driving end of the first drive motor, a rotating ring is slidably connected to the inner side of the fixed ring, matching grooves and guide rails are provided on the contact surfaces between the fixed ring and the rotating ring, teeth are provided on the outer side of the rotating ring, the gear is meshingly connected to the outer side of the rotating ring, a tripod is fixedly connected to the inner side of the rotating ring, and a plurality of rollers are fixedly connected to the bottom of the tripod.
[0006] Preferably, a plurality of electric telescopic rods are fixedly connected to the bottom of the inner wall of the coal mill body, a grinding disc is fixedly connected to the transmission sections of the plurality of electric telescopic rods, and a through hole is opened in the middle of the grinding disc.
[0007] Preferably, a second drive motor is fixedly connected to the bottom of the inner wall of the coal mill body, a rotating rod is fixedly connected to the transmission end of the second drive motor, a material guide cone is fixedly connected to the top of the rotating rod, the material guide cone and the roller are in the same plane, and the roller is above the grinding disc.
[0008] Preferably, a collecting box is provided in the middle of the rotating rod, a coal powder filter is fixedly connected to the middle of the inner wall of the collecting box, a cross paddle is provided above the coal powder filter, and the center of the cross paddle is fixedly connected to the middle of the rotating rod.
[0009] Preferably, a slag pipe is fixedly connected to the upper part of the inner wall of the collecting box, the slag pipe passes through the coal mill body, and one end of the slag pipe is fixedly connected to a slag collecting tank.
[0010] Preferably, a discharge pipe is fixedly connected to the lower portion of the inner wall of the collecting box, the discharge pipe passes through the coal mill body, and a suction fan is installed inside the discharge pipe.
[0011] Preferably, one end of the discharge pipe is fixedly connected to the coal storage bin.
[0012] Preferably, a constant temperature air exchanger is fixedly connected to the top of the coal storage bin.
[0013] The utility model has the following beneficial effects:
[0014] 1. In the utility model, the motor drives the gear to drive the rotating ring to rotate, and the rotating ring drives the roller to rotate above the grinding disc, so that the coal is crushed multiple times, making the coal easier to handle.
[0015] 2. In the utility model, the ground carbon powder and useless slag are separated by the carbon powder filter in the collection box, thereby improving the power generation efficiency.
[0016] 3. In the utility model, the safety of stored carbon powder is ensured by a constant temperature air exchanger installed on the coal storage bunker, solving the problem that carbon powder is easily combined with hydrocondensable gas to form a mass. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 A three-dimensional diagram of a coal mill for a thermal power plant boiler proposed by the utility model;
[0018] Figure 2 This is a roller structure diagram of a coal mill for a thermal power plant boiler proposed by the utility model;
[0019] Figure 3 This is a structural diagram of a collection box of a coal mill in a thermal power plant boiler proposed by the utility model;
[0020] Figure 4 This is a structural diagram of a rotating ring of a coal mill for a thermal power plant boiler proposed by the utility model;
[0021] Figure 5 The utility model is a structural diagram of a discharge pipe of a coal mill of a thermal power plant boiler.
[0022] Legend:
[0023] 1. Coal mill body; 2. Feed inlet; 3. Coal storage bin; 4. Constant temperature air exchanger; 5. Slag collection tank; 6. Discharge pipe; 7. Slag pipe; 8. Material guide funnel; 9. Material guide cone; 10. Roller; 11. Fixed rod; 12. Fixed ring; 13. Rotating ring; 14. First drive motor; 15. Electric telescopic rod; 16. Grinding disc; 17. Second drive motor; 18. Rotating rod; 19. Collection box; 20. Coal powder filter; 21. Cross paddle; 22. Gear; 23. Suction fan; 24. Tripod. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the utility model.
[0025] Reference Figure 1-Figure 4 The utility model provides an embodiment: a coal mill for a boiler in a thermal power plant, comprising a coal mill body 1, a feed inlet 2 is provided on the top of the coal mill body 1, a material guide funnel 8 is placed below the feed inlet 2, a plurality of fixed rods 11 are fixedly connected around the bottom of the inner wall of the coal mill body 1, a fixed ring 12 is connected to the top of the plurality of fixed rods 11, a first drive motor 14 is fixedly connected to the top of the fixed ring 12, a gear 22 is fixedly connected to the driving end of the first drive motor 14, a rotating ring 13 is slidably connected to the inner side of the fixed ring 12, matching grooves and guide rails are provided on the contact surfaces of the fixed ring 12 and the rotating ring 13, teeth are provided on the outer side of the rotating ring 13, the gear 22 is meshingly connected to the outer side of the rotating ring 13, a tripod 24 is fixedly connected to the inner side of the rotating ring 13, and a plurality of rollers 10 are fixedly connected to the bottom of the tripod 24.
[0026] Coal enters the coal mill body from the feed port 2 and falls into the designated position under the guidance of the guide funnel 8. A plurality of fixing rods 11 fix the fixing ring 12. The first driving motor 14 above the fixing ring 12 drives the gear 22 to drive the rotating ring 13 to rotate on the track of the fixing ring 12, and at the same time drives the tripod 24 and the roller 10 thereon to rotate.
[0027] A plurality of electric telescopic rods 15 are fixedly connected to the bottom of the inner wall of the coal mill body 1 , a grinding disc 16 is fixedly connected to the transmission sections of the plurality of electric telescopic rods 15 , and a through hole is opened in the middle of the grinding disc 16 .
[0028] The electric telescopic rod 15 lifts the grinding disc 16 to a specified position, at which time the coal thrown into the grinding disc 16 falls on the grinding disc 16 , and the electric telescopic rod 15 drops the grinding disc 16 , and the ground coal falls from the through hole in the middle of the grinding disc 16 .
[0029] A second drive motor 17 is fixedly connected to the bottom of the inner wall of the coal mill body 1, a rotating rod 18 is fixedly connected to the transmission end of the second drive motor 17, a material guide cone 9 is fixedly connected to the top of the rotating rod 18, the material guide cone 9 and the roller 10 are in the same plane, and the roller 10 is above the grinding disc 16.
[0030] The second driving motor 17 can rotate the rotating rod 18. Since the material guiding cone 9 is above the grinding disc 16, when the grinding disc 16 rises to the specified position, the bottom of the material guiding cone 9 can cover the middle through hole of the grinding disc 16.
[0031] A collecting box 19 is provided in the middle of the rotating rod 18 , a pulverized coal filter 20 is fixedly connected to the middle of the inner wall of the collecting box 19 , a cross paddle 21 is provided above the pulverized coal filter 20 , and the center of the cross paddle 21 is fixedly connected to the middle of the rotating rod 18 .
[0032] The collecting box 19 receives the ground coal, and after being filtered through the coal filter 20, the slag remains above the coal filter 20, and the carbon powder falls into the bottom of the collecting box 19. The second driving motor 17 drives the rotating rod 18 to rotate, and at the same time rotates the cross paddle 21.
[0033] A slag pipe 7 is fixedly connected to the upper part of the inner wall of the collecting box 19 . The slag pipe 7 passes through the coal mill body 1 . One end of the slag pipe 7 is fixedly connected to a slag collecting tank 5 .
[0034] The second driving motor 17 indirectly drives the cross paddle 21 to rotate, so that the slag remaining on the coal powder filter 20 is pushed into the slag pipe 7. The slag pipe 7 is placed obliquely, and the slag falls into the slag collection tank 5 under the action of gravity.
[0035] A discharge pipe 6 is fixedly connected to the lower part of the inner wall of the collecting box 19 . The discharge pipe 6 passes through the coal mill body 1 . A suction fan 23 is installed inside the discharge pipe 6 .
[0036] The filtered carbon powder at the bottom of the collecting box 19 can be sucked out by the suction fan 23 in the discharge pipe 6 .
[0037] One end of the discharge pipe 6 is fixedly connected to the coal storage bin 3 .
[0038] The carbon powder obtained after a series of crushing and separation is stored in the coal storage bin 3 through the discharge pipe 6.
[0039] A constant temperature air exchanger 4 is fixedly connected to the top of the coal storage bin 3.
[0040] The constant temperature air exchanger 4 installed on the coal storage bin 3 monitors the temperature and humidity inside the coal storage bin 3 to solve the problem that the carbon powder is easy to combine with the hydrocondensate gas to form a block
[0041] Working principle: First, the electric telescopic rod 15 raises the grinding disc 16 to the specified position, and the coal enters the coal mill body from the feed port 2 and falls under the guidance of the guide funnel 8. The bottom of the guide cone 9 can cover the middle through hole of the grinding disc 16. At this time, the input coal falls on the grinding disc 16. Multiple fixed rods 11 fix and support the fixed ring 12. The first drive motor 14 above the fixed ring 12 drives the gear 22 to drive the rotating ring 13 to rotate on the track of the fixed ring 12, and at the same time, it can drive the tripod 24 and the roller 10 thereon to rotate to grind the input coal. When the electric telescopic rod 15 drops the grinding disc 16, the ground coal falls from the grinding disc 16. The middle through hole falls down, and the collecting box 19 catches the ground coal. After being filtered through the coal filter 20, the slag remains above the coal powder filter 20, and the carbon powder falls into the bottom of the collecting box 19. At this time, the second driving motor 17 drives the rotating rod 18 to rotate, and at the same time rotates the cross paddle 21, so that the slag remaining above the coal powder filter 20 is pushed into the slag pipe 7. The slag pipe 7 is tilted, and the slag falls into the slag collecting tank 5 under the action of gravity. The suction fan 23 in the discharge pipe 6 can suck out the filtered carbon powder at the bottom of the collecting box 19. The carbon powder obtained after a series of crushing and separation is stored in the coal storage bin 3 through the discharge pipe 6.
[0042] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A coal mill for a boiler in a thermal power plant, comprising a coal mill body (1), characterized in that: The coal mill body (1) is provided with a feed inlet (2) at the top, and a material guide funnel (8) is placed below the feed inlet (2). A plurality of fixed rods (11) are fixedly connected around the bottom of the inner wall of the coal mill body (1), and the tops of the plurality of fixed rods (11) are connected to a fixed ring (12). A first drive motor (14) is fixedly connected to the top of the fixed ring (12), and a gear (22) is fixedly connected to the driving end of the first drive motor (14). A rotating ring (13) is slidably connected to the inner side of the fixed ring (12), and matching grooves and guide rails are provided on the contact surfaces of the fixed ring (12) and the rotating ring (13). Teeth are provided on the outer side of the rotating ring (13), and the gear (22) is meshedly connected to the outer side of the rotating ring (13). A tripod (24) is fixedly connected to the inner side of the rotating ring (13), and a plurality of rollers (10) are fixedly connected to the bottom of the tripod (24).
2. A coal mill for a thermal power plant boiler according to claim 1, characterized in that: A plurality of electric telescopic rods (15) are fixedly connected to the bottom of the inner wall of the coal mill body (1), a grinding disc (16) is fixedly connected to the transmission sections of the plurality of electric telescopic rods (15), and a through hole is opened in the middle of the grinding disc (16).
3. A coal mill for a thermal power plant boiler according to claim 2, characterized in that: A second drive motor (17) is fixedly connected to the bottom of the inner wall of the coal mill body (1); a rotating rod (18) is fixedly connected to the transmission end of the second drive motor (17); a material guide cone (9) is fixedly connected to the top of the rotating rod (18); the material guide cone (9) and the roller (10) are in the same plane; and the roller (10) is above the grinding disc (16).
4. A coal mill for a thermal power plant boiler according to claim 3, characterized in that: A collecting box (19) is arranged in the middle of the rotating rod (18), a coal powder filter (20) is fixedly connected to the middle of the inner wall of the collecting box (19), a cross paddle (21) is arranged above the coal powder filter (20), and the center of the cross paddle (21) is fixedly connected to the middle of the rotating rod (18).
5. A coal mill for a thermal power plant boiler according to claim 4, characterized in that: A slag pipe (7) is fixedly connected to the upper part of the inner wall of the collection box (19); the slag pipe (7) passes through the coal mill body (1); and one end of the slag pipe (7) is fixedly connected to a slag collection tank (5).
6. A coal mill for a thermal power plant boiler according to claim 5, characterized in that: A discharge pipe (6) is fixedly connected to the lower part of the inner wall of the collection box (19), the discharge pipe (6) passes through the coal mill body (1), and a suction fan (23) is installed inside the discharge pipe (6).
7. A coal mill for a thermal power plant boiler according to claim 6, characterized in that: One end of the discharge pipe (6) is fixedly connected to the coal storage bin (3).
8. A coal mill for a thermal power plant boiler according to claim 7, characterized in that: The top of the coal storage bin (3) is fixedly connected with a constant temperature air exchanger (4).