Multi-bunker intercommunication mechanism for raw coal bunker of fluidized bed boiler

Abstract

The utility model relates to a multi-bunker intercommunication mechanism for raw coal bunkers of a fluidized bed boiler, which comprises four raw coal bunkers arranged along the linear direction, a belt conveyor connected with the raw coal bunkers, a rotary unblocking device and a coal feeder, the lower part of each raw coal bunker is divided into two blanking hoppers, and each blanking hopper is provided with a split gate valve; a belt conveyor is arranged below the split gate valve, a rotary unblocking machine is installed at a coal outlet below the belt conveyor, a coal feeder is correspondingly arranged under each coal outlet, the two ends of the belt conveyor extend into the two discharging hoppers respectively, and each belt conveyor can move in a reciprocating mode and is used for mutual conveying of coal in the two bins. Different types of coal are stored in the two adjacent raw coal bunkers, intercommunication and interconnection of coal quality between the coal bunkers, accurate coal blending and flexible adjustment can be achieved through the belt conveyors, the problem that the type of coal entering a boiler is difficult to switch is solved, and cost is further reduced and efficiency is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a coal feeding technical field, concretely relates to a fluidized bed boiler raw coal bunker multi-bunker intercommunication mechanism. BACKGROUND

[0002] At present, circulating fluidized bed boilers mostly adopt coal blending and blending combustion to improve power generation efficiency and reduce fuel cost. However, in most of the raw coal bunkers, only a single coal type is stored, and when the coal type is switched, the raw coal in the bunker needs to be consumed before the coal is added again. When the coal supply changes or the unit load fluctuates, it cannot respond in time, and it cannot realize high-precision control of the blending ratio of different calorific value coals. The quality of the coal into the furnace is limited, and the peak capacity of the boiler and the consumption capacity of the poor quality coal are not strong.

[0003] Therefore, a safe, convenient and efficient coal blending modification scheme is needed to realize accurate real-time rapid switching of coal types without affecting the safety of the raw coal bunker structure, and to solve the coal burning demand of the unit under different load conditions. UTILITY MODEL CONTENT

[0004] In order to overcome the shortcomings in the prior art, the utility model provides a fluidized bed boiler raw coal bunker multi-bunker intercommunication mechanism, which connects adjacent raw coal bunkers by using a belt conveyor, adjusts the opening and closing amplitude of each bunker gate valve according to different loads and depth peak regulation needs, constructs a multi-level coal blending network, realizes multi-bunker intercommunication and interconnection, and provides coal types that are suitable for loads to the coal feeder in real time, so as to meet the requirement of rapid load change of the unit throughout the day.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of a fluidized bed boiler raw coal bunker multi-bunker intercommunication mechanism, characterized by comprising four raw coal bunkers arranged in a straight line, a belt conveyor connecting the raw coal bunkers, a rotating unblocking device and a coal feeder.

[0006] Among them, the raw coal bunker A, the raw coal bunker B, the raw coal bunker C and the raw coal bunker D are arranged in sequence, the raw coal bunker A is located at the starting end of one end, and the raw coal bunker D is located at the ending end of the other end, and each raw coal bunker is divided into two discharge hoppers.

[0007] Among them, for the raw coal bunker A and the raw coal bunker D, only the opposite gate valves are arranged in the inner side discharge hoppers, and one opposite gate valve is arranged in each discharge hopper of the raw coal bunker B and the raw coal bunker C, a belt conveyor is arranged below the opposite gate valve, and a rotating unblocking machine is installed at the coal outlet below the belt conveyor. A coal feeder is arranged below each coal outlet.

[0008] Among them, the two ends of the belt conveyor respectively extend into the two discharge hoppers, and each belt conveyor can reciprocate, which is used for mutual transmission of coal in two bunkers.

[0009] The installation position of the split gate valve is at a diameter of 2 m of the lower hopper, the coal flow passage area of the split gate valve is 2 times of that before the transformation, the split gate valve comprises two inclined gate doors, the opening and closing directions of the two inclined gate doors are arranged at an angle of 20 degrees with the running direction of the belt conveyor, and the split gate valve is controlled to open and close by using an electro-hydraulic driving device.

[0010] The raw coal bin further comprises a bin partition plate, the bin partition plate is vertically fixed below the split gate valve and is arranged in parallel with the running direction of the belt conveyor.

[0011] The bin partition plate divides the lower hopper into two spaces, and the proportion of the space on the side where the belt conveyor is located in the overall space of the lower hopper is 60%.

[0012] The belt conveyor is sealingly connected with the lower hopper of the raw coal bin, the belt conveyor has a bidirectional conveying function, and is provided with a quick-opening maintenance door, an observation port and a cleaning port.

[0013] The two adjacent raw coal bins connected with the belt conveyor store different types of coal, when the split gate valve of the right lower hopper of the raw coal bin A is opened and the split gate valve of the left lower hopper of the raw coal bin B is closed, part of the coal in the raw coal bin A directly enters the lower coal feeder through the coal outlet, and part of the coal falls on the belt conveyor and is conveyed to the raw coal bin B, so that the two raw coal bins convey the same type of coal.

[0014] The rotation speed of the belt conveyor is matched with the rotation speed of the coal feeder, and the maximum coal conveying capacity of the belt conveyor meets the maximum output of the coal mill.

[0015] The infrared camera and the high-precision material level monitoring device are installed below the belt conveyor, and the infrared camera and the high-precision material level monitoring device are electrically connected with the split gate valve and the belt conveyor, so that the control system can automatically adjust the coal conveying flow.

[0016] By adopting the above technical scheme, the utility model has the following beneficial effects:

[0017] The utility model discloses a fluidized bed boiler raw coal bunker multi-bunker intercommunication mechanism builds the flexible coal blending network of many ways of coal conveying system through belt conveyor, can freely combine different coal bunkers under different load operation conditions and carries out blending or is each other as standby, gives full play to the characteristics and advantage of each coal bunker coal kind, and the control system realizes the high accuracy control of the blending ratio of different calorific value coal kind through the regulation of the opening range of the gate valve and the accurate control of the coal supply of belt conveyor, effectively avoids the coal shortage or excess problem caused by human judgment failure or operation delay, and the operation reliability and stability of coal conveying system are improved greatly, and the manual intervention cost and labor intensity are reduced simultaneously.

[0018] The utility model will be described in detail below with the accompanying drawings. DRAWINGS

[0019] Figure 1 It is the structure schematic diagram of a fluidized bed boiler raw coal bunker multi-bunker intercommunication mechanism of the utility model.

[0020] Figure 2 It is the side view of a fluidized bed boiler raw coal bunker multi-bunker intercommunication mechanism of the utility model.

[0021] In the drawing: 1 - raw coal bunker A, 2 - raw coal bunker B, 3 - raw coal bunker C, 4 - raw coal bunker D, 5 - lower hopper, 6 - split gate valve, 7 - belt conveyor, 8 - rotary unblocking machine, 9 - coal feeder, 10 - warehouse partition. PREFERRED EMBODIMENT

[0022] In order to make the above-mentioned purpose, features and advantages of the utility model more apparent, easy to understand, the implementation scheme of the utility model is described in detail below with the accompanying drawings.

[0023] As Figure 1 shown, a fluidized bed boiler raw coal bunker multi-bunker intercommunication mechanism is characterized in that it comprises four raw coal bunkers arranged along the linear direction, a belt conveyor connected with each raw coal bunker, a rotary unblocking device and a coal feeder, raw coal bunker A1, raw coal bunker B2, raw coal bunker C3 and raw coal bunker D4 are sequentially arranged, raw coal bunker A1 is located at the starting end, raw coal bunker D4 is located at the terminal end, and each raw coal bunker is divided into two lower hoppers 5.

[0024] As Figure 1 and Figure 2As shown, for the raw coal bunker A1 and the raw coal bunker D4, only the opposed gate valve 6 is arranged at the inner side of the lower hopper 5, and one opposed gate valve 6 is arranged at each lower hopper 5 of the raw coal bunker B2 and the raw coal bunker C3, a belt conveyor 7 is arranged below the opposed gate valve 6, and a rotary unblocker 8 is installed at the coal outlet below the belt conveyor 7, one coal feeder 9 is arranged below each coal outlet, and the two ends of the belt conveyor 7 extend into the two lower hoppers 5 respectively, and each belt conveyor 7 can reciprocate to transmit the coal in the two bunkers.

[0025] In an embodiment of the utility model, the installation position of the opposed gate valve 6 is at the diameter 2m of the lower hopper 5, the coal flow area at the opposed gate valve 6 is 2 times of that before the transformation, to guarantee the smooth coal falling, the opposed gate valve 6 includes two inclined gate doors, the opening and closing direction of which is arranged at an angle of 20 degrees with the running direction of the belt conveyor 7, and the opening and closing of the opposed gate valve 6 is controlled by an electro-hydraulic driving device, and the opening range can be accurately controlled.

[0026] In an embodiment of the utility model, the raw coal bunker further includes a bunker partition plate 10, which is vertically fixed below the opposed gate valve 6 and is arranged in parallel with the running direction of the belt conveyor 7.

[0027] In an embodiment of the utility model, the bunker partition plate 10 divides the lower hopper 5 into two spaces, and the proportion of the space on the side of the belt conveyor 7 to the whole space of the lower hopper 5 is 60%, to ensure the smooth coal falling on the side of the belt conveyor 7, and the coal can also be normally fallen when the gate door on one side of the belt conveyor 7 is closed and the gate door on the other side is opened alone, to facilitate the normal operation of the unit during equipment maintenance and repair.

[0028] In an embodiment of the utility model, the belt conveyor 7 is sealingly connected with the raw coal bunker lower hopper 5, the belt conveyor 7 has a bidirectional conveying function, and a quick-opening maintenance door, an observation port and a cleaning port are arranged.

[0029] In an embodiment of the utility model, the two adjacent raw coal bunkers connected by the belt conveyor 7 store different types of coal, when the opposed gate valve 6 of the right lower hopper 5 of the raw coal bunker A1 is opened and the opposed gate valve 6 of the left lower hopper 5 of the raw coal bunker B2 is closed, part of the coal in the raw coal bunker A1 directly enters the coal feeder 9 below through the coal outlet, and part of the coal falls on the belt conveyor 7 and is conveyed to the raw coal bunker B2, to realize the conveying of the same coal type in the two raw coal bunkers, when the coal needs to be proportionally mixed and burned, different gate doors are opened according to the proportion, and the precise coal mixing is realized through the mutual conveying of the belt conveyors 7.

[0030] In an embodiment of the utility model, the belt conveyor 7 rotation speed and coal feeder rotation speed match, the maximum coal conveying capacity of belt conveyor 7 satisfies the maximum output of coal mill.

[0031] In an embodiment of the utility model, infrared camera and high-precision material level monitoring equipment are installed below the belt conveyor 7, the infrared camera and high-precision material level monitoring equipment are electrically connected with the opposed gate valve 6 and the belt conveyor 7, and the automatic adjustment of coal conveying flow of the control system can be realized.

[0032] To sum up, the multi-bin intercommunication mechanism of the fluidized bed boiler raw coal bunker has the following advantages: the multi-bin intercommunication mechanism of the fluidized bed boiler raw coal bunker is transformed by using the existing raw coal bunker of the unit, so that the coal conveying system can freely combine different coal bins for blending or standby under different load operation conditions, the characteristics and advantages of each coal bin are fully utilized, and a flexible and accurate coal blending network is constructed. The multi-bin intercommunication mechanism of the fluidized bed boiler raw coal bunker links the gate valve, the belt conveyor, the material level meter and the infrared camera, dynamically adjusts the coal conveying flow, can significantly improve the energy utilization efficiency, reduces the fuel cost, and provides a solid guarantee for the long-term stable operation of the unit.

[0033] The specific embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of ordinary skilled persons in the art without departing from the purpose of the utility model.

Claims

1. A multi-bin intercommunication mechanism of a fluidized bed boiler raw coal bin, characterized in that The coal preparation plant comprises four raw coal bins arranged in a straight line, belt conveyors connecting the raw coal bins, a rotating unblocking device and a coal feeder. The raw coal bin A (1), the raw coal bin B (2), the raw coal bin C (3) and the raw coal bin D (4) are sequentially arranged, the raw coal bin A (1) is located at the starting end, and the raw coal bin D (4) is located at the ending end. The opposite swing gate valve (6) is arranged below the inner side of the raw coal bin A (1) and the raw coal bin D (4), one opposite swing gate valve (6) is arranged below each of the raw coal bin B (2) and the raw coal bin C (3), a belt conveyor (7) is arranged below the opposite swing gate valve (6), a rotating unblocking machine (8) is arranged at the coal outlet below the belt conveyor (7), and a coal feeder (9) is arranged below each coal outlet. The two ends of the belt conveyor (7) are respectively inserted into the two hoppers (5), and each belt conveyor (7) can reciprocate to transfer coal between the two bins.

2. The multi-bin intercommunication mechanism of a fluidized bed boiler raw coal bunker according to claim 1, characterized in that The opposite swing gate valve (6) is installed at a position 2 m away from the diameter of the hopper (5), the coal flow area at the opposite swing gate valve (6) is 2 times that before the transformation, the opposite swing gate valve (6) comprises two inclined gate doors, the opening and closing direction of the two inclined gate doors is arranged at an angle of 20 degrees with the running direction of the belt conveyor (7), and the opposite swing gate valve (6) is controlled to open and close by an electro-hydraulic driving device.

3. The multi-bin intercommunication mechanism of a fluidized bed boiler raw coal bunker according to claim 1, characterized in that The raw coal bin further comprises a bin partition plate (10) which is vertically fixed below the opposite swing gate valve (6) and arranged parallel to the running direction of the belt conveyor (7).

4. The multi-bin intercommunication mechanism of a fluidized bed boiler raw coal bunker according to claim 3, characterized in that The bin partition plate (10) divides the hopper (5) into two spaces, and the space on the side of the belt conveyor (7) accounts for 60% of the overall space of the hopper (5).

5. The multi-bin intercommunication mechanism of a fluidized bed boiler raw coal bunker according to claim 1, characterized in that The belt conveyor (7) is sealingly connected with the raw coal bin hopper (5), the belt conveyor (7) has a bidirectional conveying function, and is provided with a quick-opening maintenance door, an observation port and a cleaning port.

6. The multi-bin intercommunication mechanism of a fluidized bed boiler raw coal bin according to claim 5, characterized in that The two adjacent raw coal bins connected by the belt conveyor (7) store different types of coal, when the opposite swing gate valve (6) of the right side hopper (5) of the raw coal bin A (1) is opened and the opposite swing gate valve (6) of the left side hopper (5) of the raw coal bin B (2) is closed, part of the coal in the raw coal bin A (1) directly enters the coal feeder (9) below through the coal outlet, and part of the coal falls on the belt conveyor (7) and is conveyed to the raw coal bin B (2), thereby realizing the conveying of the same coal type in the two raw coal bins.

7. The multi-bin intercommunication mechanism of a fluidized bed boiler raw coal bin according to claim 1, characterized in that The rotation speed of the belt conveyor (7) matches the rotation speed of the coal feeder, and the maximum coal conveying capacity of the belt conveyor (7) meets the maximum output of the coal mill.

8. The multi-bin intercommunication mechanism of a fluidized bed boiler raw coal bin according to claim 1, characterized in that An infrared camera and a high-precision material level monitoring device are arranged below the belt conveyor (7), and the infrared camera and the high-precision material level monitoring device are electrically connected with the opposite swing gate valve (6) and the belt conveyor (7), so that the control system can automatically adjust the coal conveying flow.

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