A boiler combustion coal feeding control device

Abstract

This invention aims to provide a boiler combustion coal feeding control device, including a support frame, an upper mounting platform, a lower mounting platform, a vibrating material distributor, a storage bin, a feed pipe, a proportioning bin mounting platform, and a proportioning bin. The lower part of the support frame has a proportioning bin mounting platform, and the proportioning bin is mounted on the platform. A feed pipe is located at the top of the proportioning bin, and a conveying device is located at the bottom to deliver coal from the proportioning bin to the boiler. The upper and lower mounting platforms are spaced apart on the upper part of the support frame. A storage bin is mounted on the lower mounting platform, and the vibrating material distributor is mounted on the upper mounting platform. A feed pipe is located at the bottom of the vibrating material distributor. The lower ends of each set of feed pipes are connected to the inlet at the top of their corresponding storage bins via flexible hose I. The lower ends of each set of storage bins are connected to the upper ends of the feed pipes via flexible hose II and branch pipes. This invention provides a boiler combustion coal feeding control device. This structure can stably control the particle size of the fed material and effectively prevent empty or overflowing storage bins.

Description

Technical Field

[0001] This invention relates to the field of coal feeding control technology, specifically to a boiler combustion coal feeding control device. Background Technology

[0002] Circulating fluidized bed boilers have effectively solved fundamental problems in thermodynamics, mechanics, and materials science, as well as engineering problems such as expansion, wear, and overheating, making them an advanced technology for the energy utilization of difficult-to-burn solid fuels (such as coal gangue, oil shale, municipal waste, sludge, and other waste materials).

[0003] Currently, circulating fluidized bed boiler combustion coal feeding systems only control the coal feed rate and feeding time. Since the volume of coal input varies, and the combustion area in contact with air also varies with volume, if the volume of input coal is not regulated, stable control of coal combustion cannot be achieved during the combustion process, leading to reduced coal utilization and resource waste. Furthermore, in the process of classifying and controlling the volume of materials, the differences between each batch of coal can easily lead to empty or overflowing storage bins. Therefore, a supercritical circulating fluidized bed boiler combustion coal feeding control device is needed. Summary of the Invention

[0004] This invention provides a boiler combustion coal feeding control device. This structure can control the particle size of the fed material in a relatively stable manner and can better avoid the situation of empty bins and bin overflows.

[0005] The boiler combustion coal feeding control device includes a support frame, an upper mounting platform, a lower mounting platform, a vibrating material distribution screen, a storage bin, a feed pipe, a proportioning bin mounting platform, and a proportioning bin;

[0006] The lower part of the support is provided with a proportioning bin mounting platform, the proportioning bin is installed on the proportioning bin mounting platform, the top of the proportioning bin is provided with a feed pipe, and the bottom of the proportioning bin is provided with a conveying device to send the coal in the proportioning bin to the boiler.

[0007] The bracket is provided with an upper mounting platform and a lower mounting platform at intervals on its upper part;

[0008] The lower mounting platform has one or more empty slots in the middle, and each empty slot has a set of storage bins. The storage bins are equipped with mounting plates above the empty slots. The lower mounting platform is equipped with mounting frames around the empty slots, and springs are provided around the bottom of the mounting plates. The lower ends of each set of springs are connected to the mounting frames and supported by the mounting frames.

[0009] Pressure switches are provided on the top surface of the mounting plate and the lower part of the mounting bracket, respectively. When the mounting plate rises or falls, the corresponding pressure switches will be triggered.

[0010] The vibrating material distribution screen is installed on the upper mounting platform. There is one or more material distribution screens arranged from small to large along the coal conveying direction. Each material distribution screen has a discharge pipe at the bottom corresponding to each group of storage bins. Each group of discharge pipes passes downward through the upper mounting platform and extends to the bottom of the upper mounting platform.

[0011] The lower ends of each set of feed pipes are connected to the inlet at the top of their corresponding storage bins via hose I; the lower ends of each set of storage bins are connected to the upper ends of the feed pipes via hose II and branch pipes.

[0012] The coal bunker is installed on a support frame, which is equipped with a hoist. The coal bunker is connected to a vibrating screen via the hoist.

[0013] The boiler combustion coal feeding control device also includes an intermediate mounting platform, on which a belt conveyor and a coal return port are provided. The coal return port is located at the end point of the belt conveyor and is connected to the top of the coal bunker through a coal return pipe.

[0014] Each set of feeding pipes is equipped with a discharge pipe, and the outlet of each set of discharge pipes is respectively located above the belt conveyor; a sealing mechanism I is provided on the feeding pipe below the discharge pipe.

[0015] The branch pipe is equipped with a sealing mechanism II.

[0016] The sealing mechanism I and sealing mechanism II have the same structure, and respectively include a mounting platform, a mounting frame, a support rod, a hinge seat, a movable block, a guide plate, a drive motor, and a screw.

[0017] The mounting frame is located on both sides of the inner wall of the discharge pipe or branch pipe, and the mounting platform is located on the outer wall of one side of the discharge pipe or branch pipe. The front side of the mounting frame extends out of the discharge pipe or branch pipe and connects to the mounting platform. There are two sets of screws, which are respectively located on both sides of the mounting frame along the direction perpendicular to the discharge pipe or branch pipe. The front end of the screw passes through the outer wall of one side of the discharge pipe or branch pipe and extends to the top of the mounting platform. A driven gear is provided on the front end of the screw. The drive motor is located on the mounting platform. The output shaft of the drive motor is parallel to the screw. A driving gear is provided on the front end of the output shaft of the drive motor. The driving gear and the driven gears on the two sets of screws are connected by a toothed belt.

[0018] Each set of screws is provided with a movable block, which is assembled onto the screw through a screw hole; the lower ends of the guide plate are respectively hinged to a set of movable blocks on both sides; the front ends of the top surface of the mounting platform are respectively provided with hinge seats; there are two sets of support rods, and the middle parts of the two sides of the guide plate are respectively hinged to the upper ends of a set of support rods; the side walls of the discharge pipe or branch pipe located on one side of the mounting platform are respectively provided with support rod slots, and the lower ends of the support rods pass through the support rod slots and are hinged to the hinge seats.

[0019] The guide plate is placed inside the discharge pipe or branch pipe. When it is perpendicular to the discharge pipe or branch pipe, it can seal the discharge pipe or branch pipe.

[0020] Pressure switches are provided at the top surface of the mounting plate and at the four corners of the lower part of the mounting bracket.

[0021] The hoses I and II are corrugated pipes made of rubber material.

[0022] The storage bin and its installation structure and the feed pipe assembly structure are provided in three sets; the vibrating feed screen is provided with two feed screens arranged from small to large along the coal conveying direction, and a feed hopper with an open top is provided after the feed screen. A set of feed pipes is installed at the bottom of the two feed screens and the feed hopper respectively.

[0023] The working process of this invention is as follows:

[0024] During use, the coal in the coal bunker is transferred to the vibrating sorting screen by the hoist. The vibrating sorting screen classifies the material according to its particle size. After classification, the material is sent to different storage bins through the feed pipe. The opening and closing state of the sealing device II in the corresponding branch pipe of the storage bin is controlled so that the material of different particle sizes is stored in the proportion bin according to the ratio. After being transferred from the proportion bin to the boiler for combustion, it can be taken out as needed.

[0025] During the process of materials entering the storage silo after sorting, due to the different volumes of materials in each batch of coal, a storage silo may become empty or full after sorting. A mounting plate installed on the storage silo, under the weight of the materials inside, compresses a spring. If the silo becomes empty, the mounting plate rises under the spring's action, and a pressure switch on it contacts the upper part of the support. The pressure switch transmits a signal to the control system, which activates the corresponding branch pipe's sealing device II to close the branch pipe. Conversely, if the mounting plate lowers the storage silo under the weight of the coal until it presses the pressure switch at the bottom of the mounting frame, the pressure switch transmits a signal to the control system, which activates the corresponding sealing device I to close the discharge pipe. The subsequently sorted materials then flow out through the discharge pipe onto the belt conveyor, which transports the materials to the return coal pipe and back into the coal bunker.

[0026] The present invention has at least the following beneficial effects:

[0027] 1. This invention uses a vibrating material sorting screen in conjunction with multiple storage bins to classify the incoming materials. Then, through a sealing mechanism II and a control system, the opening status of different branch pipes can be controlled, and materials of different particle sizes can be mixed and fed into the mixing bins, so that the combustion coal feeding system can regulate the particle size of the coal fed into the system.

[0028] 2. This invention, through the installation of a mounting bracket, mounting plate, spring, pressure switch, and other structures, allows the pressure switch to be activated by the weight of the material in the storage bin. The pressure opening controls the sealing mechanism I and sealing mechanism II, preventing the storage bin from becoming empty or bursting. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the boiler combustion coal feeding control device in an embodiment.

[0030] Figure 2 for Figure 1 Enlarged structural diagram of section A in the middle;

[0031] Figure 3 This is a schematic diagram of the connection structure of the storage component in an embodiment;

[0032] Figure 4 This is a schematic diagram of the storage assembly in an embodiment;

[0033] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of part B;

[0034] Figure 6 This is a schematic diagram showing the installation positions of the blocking mechanism I and the blocking mechanism II in this embodiment;

[0035] Figure 7 This is an enlarged schematic diagram showing the installation positions of the blocking mechanism I and the blocking mechanism II in this embodiment;

[0036] Figure 8 A schematic diagram of the blocking state of blocking mechanism I and blocking mechanism II in the embodiment;

[0037] Figure 9 This is a schematic diagram of the open states of the blocking mechanism I and the blocking mechanism II in the embodiment;

[0038] The numbers and names in the diagram are as follows:

[0039] 1-Support, 2-Upper mounting platform, 3-Lower mounting platform, 4-Vibrating material separator, 5-Storage bin, 6-Feed pipe, 7-Proportioning bin mounting platform, 8-Proportioning bin, 9-Empty trough, 10-Mounting plate, 11-Mounting frame, 12-Spring, 13-Pressure switch, 14-Discharge pipe, 15-Hose I, 16-Hose II, 17-Branch pipe, 18-Coal bunker, 19-Elevator, 20-Intermediate mounting platform, 21-Belt conveyor Conveyor, 22-Coal return port, 23-Coal return pipe, 24-Discharge pipe, 25-Blocking mechanism II, 26-Mounting platform, 27-Mounting frame, 28-Support rod, 29-Hinge seat, 30-Moving block, 31-Guide plate, 32-Drive motor, 33-Screw, 34-Driving gear, 35-Driven gear, 36-Gear belt, 37-Support rod slot, 38-Distribution screen, 39-Distribution hopper, 40-Blocking mechanism I. Detailed Implementation

[0040] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Example 1

[0041] like Figure 1-9 As shown, the boiler combustion coal feeding control device includes a support 1, an upper mounting platform 2, a lower mounting platform 3, a vibrating material distribution screen 4, a storage bin 5, a feed pipe 6, a proportioning bin mounting platform 7, and a proportioning bin 8; the coal bin 18 is installed on the support 1, and the support 1 is equipped with a hoist 19, and the coal bin 18 is connected to the vibrating material distribution screen 4 through the hoist 19.

[0042] The lower part of the support 1 is provided with a proportioning bin mounting platform 7, and the proportioning bin 8 is installed on the proportioning bin mounting platform 7. The top of the proportioning bin 8 is provided with a feed pipe 6, and the bottom of the proportioning bin 8 is provided with a conveying device to send the coal of the proportioning bin 8 to the boiler.

[0043] The bracket 1 is provided with an upper mounting platform 2 and a lower mounting platform 3 at intervals on its upper part;

[0044] The lower mounting platform 3 has three sets of empty slots 9 in the middle, and three sets of storage bins 5 are set in each empty slot 9. The storage bins 5 are equipped with mounting plates 10 above the empty slots 9. The lower mounting platform 3 is equipped with mounting frames 11 around the empty slots 9. Springs 12 are respectively provided around the bottom surface of the mounting plates 10. The lower ends of each set of springs 12 are connected to the mounting frames 11 and supported by the mounting frames 11.

[0045] Pressure switches 13 are provided at the top surface of the mounting plate 10 and at the four corners of the lower part of the mounting bracket 11. The corresponding pressure switches are triggered when the mounting plate 10 rises or falls.

[0046] The feed pipe 14 is provided in three sets; the vibrating feed screen 4 is provided with two feed screens 38 arranged from small to large along the coal conveying direction, and a feed hopper 39 with an open top is provided after the feed screen 38. A set of feed pipes 14 is installed at the bottom of the two feed screens 38 and the feed hopper 39 respectively. Each set of feed pipes 14 passes downward through the upper mounting platform 2 and extends to the bottom of the upper mounting platform 2.

[0047] The lower ends of each set of feed pipes 14 are connected to the inlet at the top of their corresponding storage bins 5 via hose I 15; the lower ends of each set of storage bins 5 are connected to the upper ends of the feed pipes 6 via hose II 16 and branch pipes 17. Hose I 15 and hose II 16 are corrugated pipes made of rubber.

[0048] The intermediate mounting platform 20 is equipped with a belt conveyor 21 and a coal return port 22. The coal return port 22 is located at the end point of the belt conveyor 21 and is connected to the top of the coal bunker 18 through a coal return pipe 23.

[0049] Each set of feed pipes 14 is equipped with a discharge pipe 24, and the outlet of each set of discharge pipes 24 is respectively located above the belt conveyor 21; a sealing mechanism I 40 is provided on the feed pipe 14 below the discharge pipe 24. A sealing mechanism II 25 is provided on the branch pipe 17.

[0050] The sealing mechanism I and sealing mechanism II 25 have the same structure, and respectively include a mounting platform 26, a mounting frame 27, a support rod 28, a hinge seat 29, a movable block 30, a guide plate 31, a drive motor 32, and a screw 33;

[0051] The mounting frame 27 is located on both sides of the inner wall of the discharge pipe 24 or branch pipe 17, and the mounting platform 26 is located on the outer wall of one side of the discharge pipe 24 or branch pipe 17. The front side of the mounting frame 27 extends out of the discharge pipe 24 or branch pipe 17 and connects to the mounting platform 26. Two sets of screws 33 are provided, respectively located on both sides of the mounting frame 27 in a direction perpendicular to the discharge pipe 24 or branch pipe 17. The front end of the screw 33 passes through the outer wall of one side of the discharge pipe 24 or branch pipe 17 and extends above the mounting platform 26. A driven gear 35 is provided on the front end of the screw 33. The drive motor 32 is located on the mounting platform 26. The output shaft of the drive motor 32 is parallel to the screw 33. A drive gear 34 is provided on the front end of the output shaft of the drive motor 32. The drive gear 34 and the driven gears 35 on the two sets of screws 33 are connected by a toothed belt 36.

[0052] Each set of screws 33 is provided with a movable block 30, which is assembled onto the screw 33 through screw holes; the lower ends of the guide plate 31 are respectively hinged to a set of movable blocks 30 on both sides; the front ends of the top surface of the mounting platform 26 are respectively provided with hinge seats 29; there are two sets of support rods 28, and the middle parts of the two sides of the guide plate 31 are respectively hinged to the upper ends of a set of support rods 28; the side walls of the discharge pipe 24 or branch pipe 17 located on one side of the mounting platform 26 are respectively provided with support rod slots 37, and the lower ends of the support rods 28 pass through the support rod slots 37 and are hinged to the hinge seats 29.

[0053] The guide plate 31 is placed inside the discharge pipe 24 or branch pipe 17. When it is perpendicular to the discharge pipe 24 or branch pipe 17, it can seal the discharge pipe 24 or branch pipe 17.

Claims

1. A boiler combustion coal feeding control device, comprising a support frame (1), an upper mounting platform (2), a lower mounting platform (3), a vibrating material distribution screen (4), a storage bin (5), a feed pipe (6), a proportioning bin mounting platform (7), and a proportioning bin (8), characterized in that: The lower part of the bracket (1) is provided with a proportioning bin mounting platform (7), and the proportioning bin (8) is installed on the proportioning bin mounting platform (7). The top of the proportioning bin (8) is provided with a feed pipe (6), and the bottom of the proportioning bin (8) is provided with a conveying device to send the coal in the proportioning bin (8) to the boiler. The bracket (1) is provided with an upper mounting platform (2) and a lower mounting platform (3) at intervals on its upper part; The lower mounting platform (3) is provided with one or more empty slots (9) in the middle. Each empty slot (9) is provided with a storage bin (5). The storage bin (5) is provided with a mounting plate (10) above the empty slot (9). The lower mounting platform (3) is provided with a mounting frame (11) around the empty slot (9). The bottom surface of the mounting plate (10) is provided with springs (12) around its perimeter. The lower ends of each set of springs (12) are connected to the mounting frame (11) and supported by the mounting frame (11). Pressure switches (13) are provided on the top surface of the mounting plate (10) and the lower part of the mounting bracket (11), respectively. When the mounting plate (10) rises or falls, the corresponding pressure switches will be triggered. The vibrating material distribution screen (4) is installed on the upper mounting platform (2). There is one or more material distribution screens (38) in the vibrating material distribution screen (4) arranged from small to large along the coal conveying direction. Each material distribution screen (38) has a discharge pipe (14) at the bottom corresponding to each group of storage bins (5). Each group of discharge pipes (14) passes downward through the upper mounting platform (2) and extends to the bottom of the upper mounting platform (2). The lower ends of each group of feed pipes (14) are connected to the inlet at the top of their corresponding storage bins (5) via hose I (15); the lower ends of each group of storage bins (5) are connected to the upper ends of feed pipes (6) via hose II (16) and branch pipes (17). It also includes an intermediate mounting platform (20), on which a belt conveyor (21) and a coal return port (22) are provided. The coal return port (22) is located at the end point of the belt conveyor (21) and is connected to the top of the coal bunker (18) through a coal return pipe (23). Each set of feeding pipes (14) is provided with a discharge pipe (24), and the outlet of each set of discharge pipes (24) is respectively located above the belt conveyor (21); a sealing mechanism I (40) is provided on the feeding pipe (14) below the discharge pipe (24). The branch pipe (17) is equipped with a sealing mechanism II (25); By installing the mounting plate (10) on the storage bin (5), the spring is compressed by the weight of the material in the storage bin (5). Once the storage bin (5) is empty, the mounting plate (10) is raised by the spring (12), and the pressure switch (13) on it contacts the upper part of the bracket (1). The pressure switch (13) transmits a signal to the control system, which controls the corresponding branch pipe (17) sealing mechanism II (25) to start closing the branch pipe (17). Once the mounting plate (10) causes the storage bin (5) to drop under the influence of the weight of the coal until it presses the pressure switch (13) at the bottom of the mounting frame (11), the pressure switch (13) transmits a signal to the control system, which controls the corresponding sealing mechanism I (40) to start closing the discharge pipe. The subsequently sorted material flows out through the discharge pipe to the belt conveyor (21). The belt conveyor (21) transports the material to the return coal pipe (23) and sends it back to the coal bunker.

2. The control device for coal feeding of a boiler according to claim 1, wherein: The coal bunker (18) is installed on the support (1), and the support (1) is equipped with a hoist (19). The coal bunker (18) is connected to the vibrating screen (4) through the hoist (19).

3. The boiler combustion coal feeding control device as described in claim 1, characterized in that: The sealing mechanism I and sealing mechanism II (25) have the same structure, including a mounting platform (26), a mounting frame (27), a support rod (28), a hinge seat (29), a movable block (30), a guide plate (31), a drive motor (32), and a screw (33), respectively. The mounting frame (27) is located on both sides of the inner wall of the discharge pipe (24) or branch pipe (17), and the mounting platform (26) is located on the outer wall of one side of the discharge pipe (24) or branch pipe (17). The front side of the mounting frame (27) extends out of the discharge pipe (24) or branch pipe (17) and connects to the mounting platform (26). The screws (33) are provided in two sets, respectively located on both sides of the mounting frame (27) in a direction perpendicular to the discharge pipe (24) or branch pipe (17). The front end of the screws (33) passes through... The screw (33) extends beyond the outer wall of the discharge pipe (24) or branch pipe (17) to the top of the mounting platform (26). A driven gear (35) is provided on the front end of the screw (33). The drive motor (32) is located on the mounting platform (26). The output shaft of the drive motor (32) is parallel to the screw (33). A drive gear (34) is provided on the front end of the output shaft of the drive motor (32). The drive gear (34) and the driven gears (35) on the two sets of screws (33) are connected by a toothed belt (36). Each set of screws (33) is provided with a movable block (30), and the movable block (30) is assembled on the screw (33) through a screw hole; the lower ends of the guide plate (31) are respectively hinged to a set of movable blocks (30); the front ends of the top surface of the mounting platform (26) are respectively provided with hinge seats (29); the support rod (28) is provided in two sets, and the middle parts of the two sides of the guide plate (31) are respectively hinged to the upper ends of a set of support rods (28). The side walls of the discharge pipe (24) or branch pipe (17) located on one side of the mounting platform (26) are respectively provided with support rod slots (37), and the lower ends of the support rods (28) pass through the support rod slots (37) and are hinged to the hinge seats (29); The guide plate (31) is placed inside the discharge pipe (24) or branch pipe (17). When it is perpendicular to the discharge pipe (24) or branch pipe (17), it can seal the discharge pipe (24) or branch pipe (17).

4. The control apparatus for coal feeding of a boiler as set forth in claim 1, wherein: Pressure switches (13) are provided at the top surface of the mounting plate (10) and at the four corners of the lower part of the mounting bracket (11).

5. The control apparatus for coal feeding of a boiler as set forth in claim 1, wherein: The hoses I (15) and II (16) are corrugated pipes made of rubber material.

6. The boiler combustion coal feeding control device as described in claim 1, characterized in that: The storage bin (5) and its installation structure and discharge pipe (14) combination structure are provided in three sets; the vibrating material distribution screen (4) is provided with two material distribution screens (38) in order of increasing size along the coal conveying direction, and a material distribution hopper (39) with an open top is provided after the material distribution screen (38). A set of discharge pipes (14) is installed at the bottom of the two material distribution screens (38) and the material distribution hopper (39).

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