CN220328554U - Flexible coal blending device for coal-fired power plant - Google Patents

Abstract

The utility model discloses a flexible coal blending device of a coal-fired power plant, which is characterized in that a raw coal bin is divided into at least two coal sub-bins for storing different coal types, a coal blending component for controlling the output flow of coal is arranged at a bottom discharge port of each coal sub-bin, and the coal output by all the coal blending components is transported, blended and transmitted to a coal mill system through a common material conveying channel; each coal blending component is provided with a circularly rotating conveying cabin for accumulating coal falling from the corresponding coal sub-bin, and the output flow of the coal in the corresponding coal sub-bin is controlled by controlling the rotating speed of each coal blending component in combination with the volume of the conveying cabin. According to the coal blending device provided by the utility model, the raw coal bin is divided into the coal bins for storing different coal types, and the independently controlled coal blending components are arranged at the discharge port, so that the mixing of different coal types in any proportion is realized by accurately controlling the output flow of different coal types of each coal blending component corresponding to the coal bins, and the problem that the blending proportion of each coal type cannot be adjusted arbitrarily in the conventional blending technology is solved.

Description

Flexible coal blending device for coal-fired power plant

Technical Field

The utility model belongs to the coal blending direction in a coal-fired power plant, and particularly relates to a flexible coal blending device of the coal-fired power plant.

Background

The flexibility of the coal motor group refers to the capability of the group to adapt to the fluctuation of output greatly and respond to various changes rapidly, the core goal of the flexibility modification is to fully respond to the fluctuation change of a power system, wherein the increase of the peak shaving capability is the most widely and mainly modification target at present, and the peak shaving capability can be adjusted through a coal blending and burning technology. The blending technology mixes different kinds of single coal according to different proportions, realizes the optimization of fuel through the complementation of coal quality, stabilizes the coal quality of the coal fed into the furnace, can improve the efficiency of the boiler, reduce the emission of pollutants, strengthen the adaptability of the boiler to the coal variety, reduce the cost of fuel, and has important significance for the optimized operation of the coal-fired thermal power plant.

Most coal blending and blending burning technologies of coal burning boilers at present adopt an out-of-furnace premixing and blending burning mode or a separate grinding and blending burning mode. The premixed blending mode outside the furnace generally adjusts the speed of the reclaimer according to different blending proportions, and each single coal type is poured onto the same belt conveyor and is mixed through multiple belt conveyor transportation, so that the mixing effect is good, but the requirements on coal storage and coal conveying facilities are high. The separate grinding and mixing burning mode is suitable for a positive pressure direct-fired pulverizing system, different coal to be fed into a factory is corresponding to coal grinding machines of different layers of burners, so that coal is mixed in the combustion process of the furnace, but the coal types suitable for the different layers of burners are confirmed through a combustion test.

The mixing proportion of various coals is basically determined once the coal feeding mode is determined no matter the premixing outside the furnace or the separate grinding and mixing combustion is carried out, unless the mixing proportion is changed through the coal reversing machine, the coal reversing machine has great influence on the main operation parameters, the environment-friendly parameters and the combustion stability of the boiler, the operation is complex, the service life of the coal reversing machine can be reduced, and the deflagration of the coal reversing machine is easy to cause.

Along with the increase of the demands of deep peak regulation and energy-saving efficiency improvement of coal-fired units, once the coal feeding mode of the existing coal blending and burning scheme is determined, the blending proportion of each coal type is basically determined, and the blending proportion of the coal type cannot be adjusted arbitrarily.

Disclosure of Invention

The utility model provides a flexible coal blending device for a coal-fired power plant, which aims to solve the problem that the blending proportion of various coals cannot be adjusted arbitrarily in the existing out-of-furnace premixing blending technology and the separate grinding blending technology.

The utility model provides a flexible coal blending device of a coal-fired power plant, which is characterized in that a raw coal bin is divided into at least two coal sub-bins, the raw coal bins are respectively used for storing different coal types, a coal blending component for controlling the output flow of coal is arranged at a bottom discharge port of each coal sub-bin, and all the coal output by the coal blending component is transported, blended and transmitted to a coal mill system through a common material conveying channel;

each coal blending component is provided with a circulating rotary conveying cabin for accumulating coal falling from the corresponding coal sub-bin, and the output flow of the coal in the corresponding coal sub-bin is controlled by controlling the rotary speed of each coal blending component in combination with the volume of the conveying cabin.

Further, the coal blending assembly comprises a driving chain wheel and a driven chain wheel, a circle of conveying chain is arranged outside the driving chain wheel and the driven chain wheel, and the conveying cabin is arranged on the surface of the conveying chain.

Further, the driving sprocket is coaxial with the driving shaft bearing seat, the driven sprocket is coaxial with the driven shaft bearing seat, and the driving bearing seat and the driven shaft bearing seat are arranged on the mounting bracket fixed on the inner wall of the coal sub-bin, so that the coal blending component is fixed on the inner wall of the corresponding coal sub-bin discharge hole through the mounting bracket.

Further, the coal blending assembly further comprises a motor, the motor is connected with a driving shaft through a coupler, and the driving shaft is coaxially connected with the driving sprocket so as to drive the driving sprocket and the driven sprocket to rotate.

Further, the number of the conveying cabins is multiple, each group of chain links of the conveying chain are welded with a conveying chain plate, two sides of the conveying chain plate are provided with leakage-proof baffles, and the adjacent conveying chain plates form a conveying cabin.

Further, a scraper is provided on the upper surface of the conveying flight so that the volume of each conveying cabin is fixed.

Further, the middle part of the leakage-proof baffle is provided with two folds, so that the width of one end is smaller than that of the other end, the small-width end or the large-width end is arranged on two sides of the conveying chain plate, each leakage-proof baffle is installed on the conveying chain plate towards the same direction, and the leakage-proof baffles on adjacent conveying chain plates are clamped and overlapped at the intersection ends.

Compared with the prior art, the utility model has the following beneficial effects:

the coal blending device provided by the utility model can be used for an original coal bunker system, the original coal bunker is divided into coal bins for storing different coal types, and the independently controlled coal blending components are arranged at the discharge port, and the accurate control of the output flow of each coal blending component corresponding to the different coal types of the coal bins can be realized by controlling the rotation speed of each coal blending component and the volume of the conveying cabin, so that the mixing of different coal types in any proportion can be realized, namely, the blending proportion of each coal type can be flexibly adjusted, the peak regulation capacity can be adjusted, and the requirements of accurate combustion optimization and unit flexible operation can be met.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.

FIG. 1 is a general block diagram of an embodiment of the present utility model;

FIG. 2 is a schematic diagram of the apparatus according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a fixed installation of a coal blending module according to an embodiment of the present utility model;

FIG. 4 is an isometric view of a device according to an embodiment of the utility model;

FIG. 5 is a diagram of a conveyor flight configuration of an embodiment of the present utility model;

reference numerals in the drawings:

2. raw coal bin 21, inferior coal bin 22, high-quality coal bin 23, coal bin guide port 24;

3. a coal blending assembly;

301. rare earth motor, 302, coupling, 303, transport cabin, 304, conveying chain, 305, driving sprocket, 306, driving bearing seat, 307, mounting bracket, 308, driven bearing seat, 309, driven sprocket, 310, conveying chain plate, 311, driving shaft, 312, driven shaft, 313, leak-proof baffle;

4. coal mill system.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order to solve the problem of being capable of adjusting the blending proportion of various coal types in real time, the utility model discloses a flexible coal blending device of a coal-fired power plant, as shown in fig. 1-2, a raw coal bin 2 is divided into at least two coal sub-bins which are respectively used for storing different coal types, a coal blending component 3 for controlling the output flow of coal is arranged at a discharge port at the bottom of each coal sub-bin, and the coal output by all the coal blending components 3 is transported, blended and transmitted to a coal mill system 4 through a common material conveying channel 24; wherein, each coal blending component 3 is provided with a conveying cabin 303 which circularly rotates and is used for accumulating the coal falling from the corresponding coal sub-cabin, and the output flow of the coal in the corresponding coal sub-cabin is controlled by controlling the rotation speed of each coal blending component 3 in combination with the volume of the conveying cabin 303.

The coal blending device provided by the utility model can be used for an original coal bunker system, the original coal bunker is divided into coal bins for storing different coal types, and the independently controlled coal blending components are arranged at the discharge port, and the accurate control of the output flow of each coal blending component corresponding to different coal types of a coal seam can be realized by controlling the rotation speed of each coal blending component and the volume of the conveying cabin, so that the flexible coal blending requirements of the coal burning power plant can be realized by mixing different coal types in any proportion.

The number of specific coal bins can be set according to the requirement, but all coal bins need to be communicated with the same material conveying channel 24, and are conveyed to the coal mill system 4 for downstream use through the same material conveying channel 24, and different coal types are mixed while being conveyed in the material conveying channel 24. Fig. 1 shows an example of dividing an original coal bin into a low-quality coal bin 21 and a high-quality coal bin 22, wherein the coals in the low-quality coal bin 21 and the high-quality coal bin 22 are piled on a coal blending assembly 3 through a coal bin guiding port 23, are conveyed into a conveying channel 24 to be mixed, and are conveyed to a coal mill system 4.

As shown in fig. 3, the coal blending assembly 3 comprises a driving sprocket 305 and a driven sprocket 309, a circle of conveying chain 304 is arranged outside the driving sprocket 305 and the driven sprocket 309, a conveying cabin 303 is arranged on the surface of the conveying chain 304, the conveying chain 304 is adopted to transmit power between the driving sprocket 305 and the driven sprocket 309, and after the conveying cabin 303 receives coal falling from the coal sub-bins, the coal is poured into a lower conveying channel 24 along with the rotation of the conveying chain 304, and different coal types are poured into the conveying channel 24 for blending during transportation.

In this embodiment, the coal blending assembly is driven by a sprocket mechanism composed of a driving sprocket 305 and a driven sprocket 309, so that a large resistance can be overcome. And the instantaneous value of the coal flow can be determined by the product of the linear speed of the chain wheel mechanism and the coal cabin capacity of the conveying cabin 303, thereby realizing the accurate control and real-time adjustment of the coal flow.

In order to fix the coal blending assembly on the inner wall of the coal bunker discharge port, the driving sprocket 305 is coaxial with the driving shaft bearing seat 306, the driven sprocket 309 is coaxial with the driven shaft bearing seat 308, the driving shaft bearing seat 306 and the driven shaft bearing seat 308 are mounted on the mounting bracket 307, and the mounting bracket 307 is fixed on the inner wall of the coal bunker, so that the coal blending assembly 3 is fixed on the inner wall of the corresponding coal bunker discharge port through the mounting bracket 307.

As shown in fig. 4, the coal blending assembly 3 further includes a motor 301, the motor 301 is connected to a driving shaft 311 through a coupling 302, the driving shaft 311 is coaxially connected to a driving sprocket 305 to drive the driving sprocket 305 and a driven sprocket 309 to rotate, and a driven shaft 312 is coaxially connected to the driven sprocket 309. The motor is preferably a rare earth motor, and a high-efficiency large-torque motor is adopted, and a driving shaft 311 is coaxially connected with a driving chain wheel 305 through a key to transmit torque, so that a plurality of follow-up shafts 312 can be driven to rotate.

Further, the number of the conveying cabins 303 is multiple, each group of chain links of the conveying chain 304 is a unit, one conveying chain plate 310 is welded on each group of chain links, two sides of the conveying chain plate 310 are provided with leakage-proof baffles 313, and adjacent conveying chain plates 310 form a conveying cabin 303 for storing and accumulating coal in the corresponding coal sub-cabins.

To further secure the volume of the transport pod 303, a scraper is provided on the upper surface of the transfer flight 310 such that the volume of each transport pod 303 is fixed.

The common leakage-proof baffle is a skirt baffle, but the skirt baffle is suitable for long-distance linear conveying chains, and is in the utility model in a short-distance circulating conveying mode, and the skirt baffle is arranged at an arc section Yi Kamei at the end part of the driving sprocket 305.

As shown in fig. 5, the present utility model provides an improved leakage preventing plate, in which the middle of the leakage preventing plate 313 is bent twice such that one end has a smaller width than the other end and one end having a smaller width or one end having a larger width is disposed at both sides of the conveying flight 310, each leakage preventing plate 313 is mounted on the conveying flight 310 to face the same direction such that the leakage preventing plates 313 on adjacent conveying flights 310 are clamped to overlap at the intersection ends. When two adjacent conveyor flights 310 are operated, the leakage prevention plates 313 overlap each other to prevent coal from flowing out of the gap. As shown in fig. 4 in particular, the leakage preventing plate 313 can be effectively overlapped when being conveyed to the circular arc section, preventing the occurrence of a large gap.

In the working process of the coal blending device, a set of 3D laser scanning detectors (not shown in the figure) is preferably installed above each coal bin for detecting the residual coal amount in each bin in real time. The 3D laser scanning detector can acquire the current volume point cloud data of the coal by emitting laser with a 3D coverage area so as to calculate the current residual coal quantity, and the technology is a common scanning residual coal quantity calculating technology for a coal bunker field person.

The coal blending device can monitor the whole production process by connecting with a control system and combining with a 3D laser scanning detector, and sends out reminding or automatically feeds coal in advance according to the residual coal quantity of the coal sub-bins.

Taking the example of dividing the raw coal bin 2 into two sub-bins, the working process of the flexible coal blending device of the coal-fired power plant is as follows:

firstly, the raw coal bin 2 is equally divided into a low-quality coal bin 21 and a high-quality coal bin 22, and different coal types are conveyed into different bins through a belt. And a 3D laser scanning detector is arranged above each sub bin, and the residual coal quantity is detected and calculated for calculation and analysis by a control system. After the control system receives the blending task, the blending proportion of the inferior coal and the high-quality coal is determined, and then the coal flow output setting is carried out on the coal blending component 3. The motor 301 of each coal blending assembly 3 outputs different rotational speeds through the coupling 302 according to different flow rates, and drives the sprocket mechanism composed of the driving sprocket 305, the driven sprocket 309, the driving shaft 311, the driven shaft 312 and the conveying chain 304 to operate. The sprocket mechanism installed on the mounting bracket 307, the driving bearing seat 306 and the driven bearing seat 308 drives the conveying cabin 303 formed by every 2 groups of conveying chain plates 310 to rotate, and the leakage prevention baffle 313 protects coal leakage and stably outputs constant coal flow to the downstream coal mill system 4, so that the mixing proportion is accurate. The instantaneous value of the coal flow is determined by the product of the linear speed of the sprocket mechanism and the coal cabin capacity of the conveying cabin 303, and the linear speed of the sprocket mechanism is calculated according to the blending proportion because the capacity of the conveying cabin 303 is fixed, so that the linear speeds of different coal blending components can be calculated by huge calculation capacity of the existing computer.

The flexible coal blending device of the coal-fired power plant can be applied to an original coal bunker system, the device is directly driven by a motor with large torque, the chain wheel mechanism is controlled to transport, and the precise control of the coal quantity of coal transportation is realized by stepless speed regulation of a transport mechanism, so that the mixing of different coal types in different coal bins in any proportion is achieved, the peak regulation capacity is increased, and the real-time precise combustion optimization and unit flexible operation requirements are met.

The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements may be made to the present application by those skilled in the art, which modifications and equivalents are also considered to be within the scope of the present application.

Claims (7)

1. A flexible coal blending device for a coal-fired power plant is characterized in that,

the raw coal bin (2) is divided into at least two coal sub-bins which are respectively used for storing different coal types, a coal blending component (3) for controlling the output flow of coal is arranged at the bottom discharge port of each coal sub-bin, and the coal output by all the coal blending components (3) is transported, blended and transmitted to a coal mill system (4) through a common material conveying channel;

each coal blending component (3) is provided with a circulating rotating conveying cabin (303) for accumulating coal falling from the corresponding coal sub-bin, and the output flow of the coal in the corresponding coal sub-bin is controlled by controlling the rotating speed of each coal blending component (3) in combination with the volume of the conveying cabin (303).

2. The flexible coal blending device of the coal-fired power plant according to claim 1, wherein,

the coal blending assembly (3) comprises a driving chain wheel (305) and a driven chain wheel (309), a circle of conveying chain (304) is arranged outside the driving chain wheel (305) and the driven chain wheel (309), and the conveying cabin (303) is arranged on the surface of the conveying chain (304).

3. The flexible coal blending device of the coal-fired power plant according to claim 2, wherein,

the driving chain wheel (305) is coaxial with the driving shaft bearing seat (306), the driven chain wheel (309) is coaxial with the driven shaft bearing seat (308), and the driving shaft bearing seat (306) and the driven shaft bearing seat (308) are arranged on the mounting bracket (307) fixed on the inner wall of the coal sub-bin, so that the coal blending component (3) is fixed on the inner wall of the corresponding coal sub-bin discharge hole through the mounting bracket (307).

4. The flexible coal blending device of the coal-fired power plant according to claim 2, wherein,

the coal blending assembly (3) further comprises a motor (301), the motor (301) is connected with a driving shaft (311) through a coupler (302), and the driving shaft (311) is coaxially connected with the driving sprocket (305) so as to drive the driving sprocket (305) and the driven sprocket (309) to rotate.

5. The flexible coal blending device of the coal-fired power plant according to claim 2, wherein,

the number of the conveying cabins (303) is multiple, each group of chain links of the conveying chain (304) is welded with a conveying chain plate (310), two sides of the conveying chain plate (310) are provided with leakage-proof baffles (313), and the adjacent conveying chain plates (310) form one conveying cabin (303).

6. The flexible coal blending device of a coal-fired power plant according to claim 5, wherein,

the upper surface of the conveying chain plate (310) is provided with a scraper, so that the volume of each conveying cabin (303) is fixed.

7. The flexible coal blending device of a coal-fired power plant according to claim 5, wherein,

the middle part of leak protection baffle (313) has twice to bend for the width of one end is less than the other end, and the one end that the width is little or the one end that the width is big sets up the both sides of conveying link joint (310), every leak protection baffle (313) towards the same install on conveying link joint (310), make on the adjacent conveying link joint (310) leak protection baffle (313) centre gripping overlap at the intersection end.