Coal blending system and thermal power generating unit

Abstract

The invention relates to a coal blending system and a thermal power generating unit, the coal blending system comprises a coal blending device and a plurality of coal blending devices, each coal blending device comprises a conveying belt, a plurality of baffles, a plurality of second discharging pipes and a plurality of third discharging pipes, and the number of the baffles, the number of the second discharging pipes, the number of the third discharging pipes, the number of raw coal bins and the number of coal feeders are the same; an inlet of each second discharging pipe is communicated with the interior of the corresponding raw coal bunker, each second discharging pipe is provided with a second coal gate, an outlet of each third discharging pipe is communicated with a second inlet of the corresponding coal feeder, and outlets of the second discharging pipes are arranged above an inlet of the corresponding third discharging pipe at intervals. A baffle capable of rotating is arranged between an outlet of each second discharging pipe and an inlet of the corresponding third discharging pipe, a conveying belt is arranged between every two adjacent baffles, the conveying belt can convey coal briquettes on one baffle of every two adjacent baffles towards the other baffle, and the baffles have the horizontal state and the vertical state.

Description

Technical Field

[0001] The present disclosure relates to the technical field of thermal power generation equipment, and in particular to a coal blending system and a thermal power unit. Background Art

[0002] Coal blending is an important means for thermal power plants to improve operational flexibility and economy. Usually, different types of coal (such as high calorific value coal, general coal, low calorific value coal, etc.) are stored in different raw coal bunkers, and coal is supplied to the furnace from different raw coal bunkers to achieve the purpose of optimizing combustion effect, reducing pollutant emissions, and improving economic benefits. However, with the increasing requirements of the power grid for deep peak-shaving capabilities, thermal power units are required to have stronger load regulation capabilities.

[0003] In the prior art, in order to improve the load regulation capability of thermal power units, it is usually necessary to replace the coal in the raw coal bunker so that multiple raw coal bunkers can simultaneously supply high calorific value coal to the furnace to increase the supply of high calorific value coal. Replacing the coal in the raw coal bunker is time-consuming, resulting in a slow load regulation speed of the thermal power unit. Moreover, the raw coal bunker cannot supply coal to the furnace during the replacement process, which will cause the total coal supply to decrease for a period of time, thereby affecting the maintenance of high-load operation of the thermal power unit. Summary of the invention

[0004] The purpose of the present disclosure is to provide a coal blending system and a thermal power unit to solve the above technical problems.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present disclosure, a coal blending system for a thermal power unit is provided, comprising a coal adjusting device and a plurality of coal blending devices; Each of the coal blending devices comprises a raw coal bin, a first discharge pipe, a coal feeder and a coal mill, wherein the raw coal bin is used to contain coal lumps, the inlet of each first discharge pipe is connected to the interior of the corresponding raw coal bin, the outlet of each first discharge pipe is connected to the first inlet of the corresponding coal feeder, the outlet of each coal feeder is connected to the inlet of the corresponding coal mill, and each of the first discharge pipes is provided with a first coal gate; The coal adjusting device comprises a conveyor belt, a plurality of baffles, a plurality of second discharge pipes and a plurality of third discharge pipes, the number of the baffles, the second discharge pipes, the third discharge pipes, the raw coal bin and the coal feeder are the same, the inlet of each second discharge pipe is communicated with the interior of the corresponding raw coal bin, each second discharge pipe is provided with a second coal gate, the outlet of each third discharge pipe is communicated with the second inlet of the corresponding coal feeder, the outlet of each second discharge pipe is arranged above the inlet of the corresponding third discharge pipe, and a rotatable baffle is provided between the outlet of each second discharge pipe and the inlet of the corresponding third discharge pipe, the conveyor belt is provided between two adjacent baffles, and the conveyor belt can convey the coal blocks on one of the two adjacent baffles toward the other baffle; In which, the baffle has a horizontal state and a vertical state. In the horizontal state, the baffle blocks the entrance of the third discharge pipe so that the baffle can receive the coal blocks falling from the outlet of the second discharge pipe; in the vertical state, the baffle exposes the entrance of the third discharge pipe so that the coal blocks falling from the outlet of the second discharge pipe or the coal blocks on the conveyor belt can enter the third discharge pipe.

[0006] Optionally, the coal regulating device further comprises a shell and a plurality of driving members, a plurality of coal inlets are formed at the top of the shell, a plurality of coal outlets are formed at the bottom of the shell, the plurality of coal inlets are arranged in one-to-one correspondence with the plurality of second discharge pipes, the outlet of each second discharge pipe is connected to the corresponding coal inlet, the plurality of coal outlets are arranged in one-to-one correspondence with the plurality of third discharge pipes, and the outlet of each third discharge pipe is connected to the corresponding coal outlet; The baffle and the conveyor belt are both arranged in the shell, and the baffle is located between the coal inlet and the coal outlet and is rotatably connected to the shell; The plurality of driving members are arranged in one-to-one correspondence with the plurality of baffles, each of the driving members is mounted on the housing and connected to the corresponding baffle, and the driving member is used to drive the baffle to rotate.

[0007] Optionally, the plurality of raw coal bins and the plurality of coal feeders are arranged at intervals in the horizontal direction, and the shell extends in the horizontal direction.

[0008] Optionally, the coal regulating device further comprises an air guide pipe, one end of which is used to communicate with a primary air system of the boiler, and a second end of which is connected with the interior of the shell.

[0009] Optionally, the coal regulating device further comprises a rotating scraper blockage clearing device, and the rotating scraper blockage clearing device is arranged on the second discharge pipe.

[0010] Optionally, the second discharge pipe comprises an inclined section and a vertical section, the vertical section extends in a vertical direction, the inclined section extends obliquely, and an obtuse angle is formed between the inclined section and the vertical section; The inlet of the inclined section is connected to the side of the raw coal bin, the outlet of the inclined section is connected to the inlet of the vertical section, the outlet of the vertical section is located above the inlet of the third discharge pipe, and the rotating scraper clearing device is arranged on the vertical section.

[0011] Optionally, the second coal gate is arranged at the connection between the vertical section and the inclined section.

[0012] Optionally, the angle between the axial direction of the inclined section and the horizontal direction is 30°~50°.

[0013] Optionally, the coal adjusting device further includes a third coal gate, and the third coal gate is arranged on the third discharge pipe.

[0014] According to a second aspect of the present disclosure, a thermal power unit is provided, comprising a boiler and the above-mentioned coal blending system.

[0015] According to the above technical solution, since the inlet of each second discharge pipe is connected to the interior of the corresponding raw coal bin, and the outlet of each second discharge pipe is arranged above the inlet of the corresponding third discharge pipe, when the second coal gate on the second discharge pipe is in the open state, under the action of gravity, the coal blocks in the corresponding raw coal bin can also fall from the outlet of the second discharge pipe to the upper part of the outlet of the third discharge pipe. Since the outlet of each second discharge pipe is arranged above the inlet of the corresponding third discharge pipe, and a rotatable baffle is arranged between the outlet of each second discharge pipe and the inlet of the corresponding third discharge pipe, and a conveyor belt is arranged between two adjacent baffles, the coal blocks falling from the outlet of the second discharge pipe can be accumulated on the horizontal baffle, and can be conveyed to another baffle by the adjacent conveyor belt until it is conveyed to the vertical baffle, and the coal blocks can fall into the inlet of the third discharge pipe below the baffle, and enter the coal feeder through the third discharge pipe, thereby realizing the coal supply from the raw coal bin of one coal blending device to the coal mill of another coal blending device.

[0016] Therefore, when the thermal power generating unit needs to increase the load, the first coal gate and the second coal gate corresponding to the raw coal bin containing low calorific value coal can be closed, and the corresponding baffles can be adjusted to a vertical state, and the first coal gate and the second coal gate corresponding to the raw coal bin containing high calorific value coal can be opened, and the corresponding baffles can be adjusted to a horizontal state, so that the raw coal bin storing low calorific value coal stops supplying low calorific value coal, and the raw coal bin storing high calorific value coal can not only supply high calorific value coal to the corresponding coal mill, but also supply high calorific value coal to the coal mill corresponding to the raw coal bin storing low calorific value coal through the coal regulating device, thereby increasing the total amount of high calorific value coal supplied to the furnace, which is beneficial to increase the maximum load of the thermal power unit. In addition, the process does not require replacement of the raw coal bin, which is beneficial to improving the load adjustment speed of the thermal power unit, and the total amount of coal supply will not be reduced for a period of time due to the replacement of the coal in the raw coal bin, which is beneficial to maintaining the high load operation of the thermal power unit.

[0017] When the thermal power generating unit needs to reduce the load, the above-mentioned means can be used to switch the first coal gate and the second coal gate accordingly, so that the raw coal bin storing high calorific value coal stops supplying high calorific value coal, and the raw coal bin storing low calorific value coal supplies low calorific value coal to the coal mill corresponding to itself and the coal mill corresponding to the raw coal bin storing high calorific value coal at the same time, thereby saving the use of high calorific value coal and further helping to reduce the operating cost of the thermal power generating unit.

[0018] Moreover, through the coordination between multiple baffles and conveyor belts, coal adjustment between three or more coal blending devices can be achieved. For example, in an embodiment where there are three coal blending devices, the baffle corresponding to the coal blending device that needs to be adjusted can be adjusted to a vertical state, and the other baffles can be adjusted to a horizontal state, and then the conveyor belt can be controlled to convey to the conveyor belt, so that the raw coal bins of other coal blending devices all supply coal to the coal feeder of this coal blending device.

[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 It is a schematic diagram of the three-dimensional structure of a coal blending system provided in one embodiment of the present disclosure.

[0021] Figure 2 It is a front view of a coal regulating device provided in one embodiment of the present disclosure, wherein the internal structure of the shell is schematically shown.

[0022] Description of Reference Numerals 1000-coal blending system; 100-coal adjusting device; 10-conveyor belt; 20-baffle; 21-driving member; 30-second discharge pipe; 31-inclined section; 32-vertical section; 40-third discharge pipe; 50-shell; 51-coal inlet; 52-coal outlet; 60-air duct; 70-rotating scraper clearing device; 91-first coal gate; 92-second coal gate; 93-third coal gate; 200-coal blending device; 210-raw coal bin; 220-first discharge pipe; 230-coal feeder; 231-first entrance; 232-second entrance; 240-coal mill. DETAILED DESCRIPTION

[0023] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0024] In the present disclosure, unless otherwise stated, the directional words used, such as "upper, lower, top, and bottom", are generally defined by the upper, lower, top, and bottom of the coal blending system under normal use (for details, please refer to Figure 2 ), is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, a specific orientation structure and operation, and therefore cannot be understood as limiting the present disclosure. "Inside and outside" refer to the inside and outside of the corresponding component outline. In addition, the terms "first", "second", etc. used are to distinguish one element from another, and do not have order and importance.

[0025] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0026] like Figure 1 and Figure 2As shown, according to the first aspect of the present disclosure, a coal blending system 1000 of a thermal power unit is provided, comprising a coal adjusting device 100 and a plurality of coal blending devices 200, each of the coal blending devices 200 comprising a raw coal bin 210, a first discharge pipe 220, a coal feeder 230 and a coal mill 240, the raw coal bin 210 is used to contain coal blocks, the inlet of each first discharge pipe 220 is connected to the interior of the corresponding raw coal bin 210, and the outlet of each first discharge pipe 220 is connected to the first outlet of the corresponding coal feeder 230. The inlet 231 of each coal feeder 230 is connected to the inlet of the corresponding coal mill 240, and each first discharge pipe 220 is provided with a first coal gate 91. The coal adjustment device 100 includes a conveyor belt 10, a plurality of baffles 20, a plurality of second discharge pipes 30 and a plurality of third discharge pipes 40. The number of baffles 20, the second discharge pipes 30, the third discharge pipes 40, the raw coal bin 210 and the coal feeder 230 is the same. The inlet of each second discharge pipe 30 is connected to the inlet of the corresponding raw coal bin 210. The second discharge pipe 30 is connected to the inside, and a second coal gate 92 is provided on each second discharge pipe 30. The outlet of each third discharge pipe 40 is connected to the second inlet 232 of the corresponding coal feeder 230. The outlet of each second discharge pipe 30 is arranged above the inlet of the corresponding third discharge pipe 40, and a rotatable baffle 20 is provided between the outlet of each second discharge pipe 30 and the inlet of the corresponding third discharge pipe 40. A conveyor belt 10 is provided between two adjacent baffles 20, and the conveyor belt 10 can transfer the coal to the feeder 230. The coal blocks on one of the two adjacent baffles 20 are transferred toward the other baffle 20, wherein the baffle 20 has a horizontal state and a vertical state. In the horizontal state, the baffle 20 blocks the entrance of the third discharge pipe 40 so that the baffle 20 can receive the coal blocks dropped from the outlet of the second discharge pipe 30. In the vertical state, the baffle 20 exposes the entrance of the third discharge pipe 40 so that the coal blocks dropped from the outlet of the second discharge pipe 30 or the coal blocks on the conveyor belt 10 can enter the third discharge pipe 40.

[0027] The working process of any of the above-mentioned coal blending devices 200 can be: when the first coal gate 91 on the first discharge pipe 220 is in an open state, under the action of gravity, the coal blocks in the raw coal bin 210 can enter the coal feeder 230 through the first discharge pipe 220, and be transported to the coal mill 240 through the coal feeder 230, and ground into coal powder by the coal mill 240, and the coal powder can be transported to the furnace of the thermal power unit for combustion.

[0028] Through the above technical solution, since the inlet of each second discharge pipe 30 is connected to the interior of the corresponding raw coal bin 210, and the outlet of each second discharge pipe 30 is spaced above the inlet of the corresponding third discharge pipe 40, when the second coal gate 92 on the second discharge pipe 30 is in an open state, under the action of gravity, the coal blocks in the corresponding raw coal bin 210 can also fall through the outlet of the second discharge pipe 30 to above the outlet of the third discharge pipe 40. Since the outlet of each second discharge pipe 30 is arranged above the inlet of the corresponding third discharge pipe 40, and a rotatable baffle 20 is arranged between the outlet of each second discharge pipe 30 and the inlet of the corresponding third discharge pipe 40, and a conveyor belt 10 is arranged between two adjacent baffles 20, the coal blocks falling from the outlet of the second discharge pipe 30 can be accumulated on the horizontal baffle 20, and can be conveyed to another baffle 20 by the adjacent conveyor belt 10 until being conveyed to the vertical baffle 20, and the coal blocks can fall into the inlet of the third discharge pipe 40 below the baffle 20, and enter the coal feeder 230 through the third discharge pipe 40, thereby realizing the coal supply from the raw coal bin 210 of one coal blending device 200 to the coal pulverizer 240 of another coal blending device 200.

[0029] Therefore, when the thermal power generating unit needs to increase its load, the first coal gate 91 and the second coal gate 92 corresponding to the raw coal bin 210 containing low calorific value coal can be closed, and the corresponding baffle 20 can be adjusted to a vertical state, and the first coal gate 91 and the second coal gate 92 corresponding to the raw coal bin 210 containing high calorific value coal can be opened, and the corresponding baffle 20 can be adjusted to a horizontal state, so that the raw coal bin 210 storing low calorific value coal stops supplying low calorific value coal, and the raw coal bin 210 storing high calorific value coal can not only supply high calorific value coal to the corresponding pulverizer 240 itself, but also supply high calorific value coal to the pulverizer 240 corresponding to the raw coal bin 210 storing low calorific value coal through the coal adjusting device 100, thereby increasing the total amount of high calorific value coal supplied to the furnace, which is beneficial to increase the maximum load of the thermal power unit. Moreover, this process does not require replacement of the raw coal bin 210, which is beneficial to improving the load regulation speed of the thermal power unit, and will not cause the total coal supply to be reduced for a period of time due to replacement of the coal in the raw coal bin 210, which is beneficial to maintaining the high-load operation of the thermal power unit.

[0030] When the thermal power generating set needs to reduce the load, the above-mentioned means can be used to switch the first coal gate 91 and the second coal gate 92 accordingly, so that the raw coal bin 210 storing high calorific value coal stops supplying high calorific value coal, and the raw coal bin 210 storing low calorific value coal supplies low calorific value coal to the coal mill 240 corresponding to itself and the coal mill 240 corresponding to the raw coal bin 210 storing high calorific value coal at the same time, thereby saving the use of high calorific value coal, and further helping to reduce the operating cost of the thermal power generating set.

[0031] Moreover, through the coordination between multiple baffles 20 and the conveyor belt 10, coal adjustment between three or more coal blending devices 200 can be achieved. For example, in an embodiment in which there are three coal blending devices 200, the corresponding baffle 20 of the coal blending device 200 that needs to be adjusted can be adjusted to a vertical state, and the other baffles 20 can be adjusted to a horizontal state, and then the conveyor belt 10 is controlled to convey to the conveyor belt 10, so that the raw coal bins 210 of other coal blending devices 200 all supply coal to the coal feeder 230 of the coal blending device 200.

[0032] In addition, by respectively adjusting the direction of multiple conveyor belts 10 and the status of multiple baffles 20, it is also possible to realize the supply of coal from multiple raw coal bins 210 to the same coal mill 240, or to realize the supply of coal from multiple raw coal bins 210 to multiple coal mills 240 respectively, which is not repeated in this disclosure.

[0033] It is understandable that, under the action of gravity, the coal blocks on the horizontal baffle 20 can be accumulated on the baffle 20 in a cone shape with a continuously increasing volume, and as the conveyor belt 10 runs, the coal blocks accumulated on the adjacent conveyor belt 10 can be conveyed away, so that the adjacent conveyor belt 10 can convey the coal blocks on the baffle 20. When the coal adjusting device 100 is not in use, all the baffles 20 can be adjusted to a vertical state, and the operation of the conveyor belt 10 can be coordinated to empty the accumulated coal in the coal adjusting device 100 to ensure the safety of the equipment.

[0034] Alternatively, if Figure 2 As shown, the coal adjusting device 100 also includes a shell 50 and a plurality of driving members 21. A plurality of coal inlets 51 are formed at the top of the shell 50, and a plurality of coal outlets 52 are formed at the bottom of the shell 50. The plurality of coal inlets 51 are arranged in one-to-one correspondence with the plurality of second discharge pipes 30, and the outlet of each second discharge pipe 30 is connected to the corresponding coal inlet 51. The plurality of coal outlets 52 are arranged in one-to-one correspondence with the plurality of third discharge pipes 40, and the outlet of each third discharge pipe 40 is connected to the corresponding coal outlet 52. The baffle 20 and the conveyor belt 10 are both arranged in the shell 50, and the baffle 20 is located between the coal inlet 51 and the coal outlet 52 and is rotatably connected to the shell 50. The plurality of driving members 21 are arranged in one-to-one correspondence with the plurality of baffles 20, and each driving member 21 is installed on the shell 50 and connected to the corresponding baffle 20. The driving member 21 is used to drive the baffle 20 to rotate.

[0035] Since the outlet of the second discharge pipe 30 is connected to the corresponding coal inlet 51, the outlet of each third discharge pipe 40 is connected to the corresponding coal outlet 52, and the baffle 20 and the conveyor belt 10 are both arranged in the shell 50, the coal blocks are located in the shell 50 after falling from the outlet of the third discharge pipe 40 and before entering the inlet of the third discharge pipe 40, so that the entire coal adjustment work can be carried out in a relatively closed space of the shell 50, which is beneficial to prevent coal blocks from falling out of the coal adjustment device 100 and to prevent coal powder from floating out of the coal adjustment device 100. On the one hand, it is beneficial to reduce coal waste, and on the other hand, it is beneficial to reduce pollution to the environment.

[0036] Furthermore, since the staff can drive the baffle 20 to rotate through the driving member 21 without having to directly operate the baffle 20, the staff can be isolated from direct contact with the coal, which is beneficial to protecting the safety of the staff on the one hand, and improving the cleanliness of the working environment of the staff on the other hand.

[0037] Here, the driving member 21 can be an electric driving member 21, that is, the baffle 20 can be driven to rotate by a motor, or it can be a manual driving member 21, that is, the baffle 20 can be driven to rotate by a rotating shaft connected to the baffle 20 and extending outside the shell 50.

[0038] In the present disclosure, the coal blending system 1000 can be arranged in any suitable layout according to actual conditions, and the present disclosure does not limit this. As an implementation method, Figure 1 As shown, multiple raw coal bins 210 and multiple coal feeders 230 are arranged at intervals in the horizontal direction, and the housing 50 extends in the horizontal direction. Such an arrangement can make the multiple raw coal bins 210, multiple coal feeders 230 and the housing 50 arranged more compactly, thereby saving the length of the second discharge pipe 30 and the third discharge pipe 40, which is not only conducive to reducing the cost of the coal blending system 1000, but also conducive to reducing the occupied space of the coal blending system 1000.

[0039] Alternatively, if Figure 2 As shown, the coal adjusting device 100 further includes an air guide pipe 60, one end of which is used to communicate with the primary air system of the boiler, and the second end of the air guide pipe 60 is communicated with the interior of the shell 50. One end of the air guide pipe 60 can be connected with the primary air system of the boiler, and air is supplied to the interior of the shell 50 through the primary air system via the air guide pipe 60, so that a positive pressure is generated inside the shell 50, which is beneficial to prevent hot air in the downstream equipment of the coal adjusting device 100 (such as the coal mill 240) from entering the shell 50 to induce combustion of coal blocks, thereby improving the safety of the coal blending system 1000.

[0040] In order to improve the fluidity of the coal block in the second discharge pipe 30, as an implementation method, Figure 1 and Figure 2As shown, the coal adjustment device 100 further includes a rotary scraper clearing device 70, which is disposed on the second discharge pipe 30. Since the rotary scraper clearing device 70 can continuously scrape the coal blocks near the pipe wall of the second discharge pipe 30, the fluidity of the coal blocks in the second discharge pipe 30 can be improved under the action of the rotary scraper clearing device 70, thereby facilitating the prevention of coal blocks from being blocked in the second discharge pipe 30 and preventing coal from being cut off in the second discharge pipe 30, thereby facilitating the improvement of the reliability of the coal blending system 1000.

[0041] The present disclosure does not limit the structure of the second discharge pipe 30. As an implementation method, Figure 1 As shown, the second discharge pipe 30 includes an inclined section 31 and a vertical section 32. The vertical section 32 extends in the vertical direction. The inclined section 31 extends obliquely, and an obtuse angle is formed between the inclined section 31 and the vertical section 32. The inlet of the inclined section 31 is connected to the side of the raw coal bin 210, and the outlet of the inclined section 31 is connected to the inlet of the vertical section 32. The outlet of the vertical section 32 is located above the inlet of the third discharge pipe 40, and the rotating scraper clearing device 70 is arranged on the vertical section 32.

[0042] By configuring the second discharge pipe 30 to include an inclined section 31 and a vertical section 32, and connecting the inlet of the inclined section 31 to the side of the raw coal bin 210, it is possible to prevent the coal adjustment device 100 from interfering with the first discharge pipe 220 and related equipment (such as the coal feeder 230) when the raw coal bin 210 supplies coal to the coal adjustment device 100. In addition, since the structure of the second discharge pipe 30 does not affect the layout of the traditional coal adjustment device 200, it is convenient for the coal adjustment system 1000 provided by the present disclosure to be modified on the basis of the original coal adjustment system.

[0043] Alternatively, if Figure 1 and Figure 2 As shown, the second coal gate 92 can be arranged at the connection between the vertical section 32 and the inclined section 31. That is, the second coal gate 92 can be arranged at the end of the vertical section 32, so that the interior of the vertical section 32 has more continuous space, which is conducive to the scraper of the rotating scraper clearing device 70 covering a larger space inside the vertical section 32, and further conducive to further improving the fluidity of the coal block in the vertical section 32 under the action of the rotating scraper clearing device 70.

[0044] Moreover, since this arrangement can ensure good fluidity in the vertical section 32, the vertical section 32 can also serve as a buffer bin, that is, when the coal blocks in the inclined section 31 or the raw coal bin 210 are not flowing smoothly or are blocked, the coal blocks in the vertical section 32 can still maintain a supply of coal blocks for a period of time, thereby reserving more emergency processing time for the workers, for example, the inclined section 31 can be unblocked by knocking on it.

[0045] In the present disclosure, the angle between the axial direction and the horizontal direction of the inclined section 31 can be set to any appropriate angle according to actual conditions, and the present disclosure does not limit this. As an embodiment, the angle between the axial direction and the horizontal direction of the inclined section 31 can be 30°~50°, including 30° and 50°. Such a setting can make the inclined section 31 have a steeper inclination while avoiding interference between the coal adjustment device 100 and the coal blending device 200. On the one hand, it is conducive to reducing the space occupied by the coal blending system 1000 in the horizontal direction, and on the other hand, it is also conducive to reducing the resistance of the coal block to flow in the inclined section 31, thereby facilitating the improvement of the fluidity of the coal block in the time period.

[0046] Alternatively, if Figure 1 and Figure 2 As shown, the coal adjusting device 100 may further include a third coal gate 93, which is disposed on the third discharge pipe 40. By opening or closing the third coal gate 93, the coal adjusting device 100 and the coal feeder 230 may be connected or disconnected. Therefore, the third gate may be closed when the coal adjusting device 100 is inspected, maintained, or the coal adjusting device 100 is exited. When the coal blocks in the coal feeder 230 or the coal mill 240 spontaneously combust, the impact of the combustion on the safety of the coal adjusting equipment and the maintenance personnel is reduced.

[0047] According to a second aspect of the present disclosure, a thermal power unit is provided, comprising a boiler and the above-mentioned coal blending system 1000.

[0048] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0049] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0050] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A coal blending system for a thermal power unit, characterized in that: It includes a coal adjustment device and multiple coal blending devices; Each of the coal blending devices comprises a raw coal bin, a first discharge pipe, a coal feeder and a coal mill, wherein the raw coal bin is used to contain coal lumps, the inlet of each first discharge pipe is connected to the interior of the corresponding raw coal bin, the outlet of each first discharge pipe is connected to the first inlet of the corresponding coal feeder, the outlet of each coal feeder is connected to the inlet of the corresponding coal mill, and each of the first discharge pipes is provided with a first coal gate; The coal adjusting device comprises a conveyor belt, a plurality of baffles, a plurality of second discharge pipes and a plurality of third discharge pipes, the number of the baffles, the second discharge pipes, the third discharge pipes, the raw coal bin and the coal feeder are the same, the inlet of each second discharge pipe is communicated with the interior of the corresponding raw coal bin, each second discharge pipe is provided with a second coal gate, the outlet of each third discharge pipe is communicated with the second inlet of the corresponding coal feeder, the outlet of each second discharge pipe is arranged above the inlet of the corresponding third discharge pipe, and a rotatable baffle is provided between the outlet of each second discharge pipe and the inlet of the corresponding third discharge pipe, the conveyor belt is provided between two adjacent baffles, and the conveyor belt can convey the coal blocks on one of the two adjacent baffles toward the other baffle; In which, the baffle has a horizontal state and a vertical state. In the horizontal state, the baffle blocks the entrance of the third discharge pipe so that the baffle can receive the coal blocks falling from the outlet of the second discharge pipe; in the vertical state, the baffle exposes the entrance of the third discharge pipe so that the coal blocks falling from the outlet of the second discharge pipe or the coal blocks on the conveyor belt can enter the third discharge pipe.

2. The coal blending system according to claim 1, characterized in that: The coal adjusting device further comprises a shell and a plurality of driving members, a plurality of coal inlets are formed at the top of the shell, a plurality of coal outlets are formed at the bottom of the shell, the plurality of coal inlets are arranged in one-to-one correspondence with the plurality of second discharge pipes, the outlet of each second discharge pipe is connected to the corresponding coal inlet, the plurality of coal outlets are arranged in one-to-one correspondence with the plurality of third discharge pipes, and the outlet of each third discharge pipe is connected to the corresponding coal outlet; The baffle and the conveyor belt are both arranged in the shell, and the baffle is located between the coal inlet and the coal outlet and is rotatably connected to the shell; The plurality of driving members are arranged in one-to-one correspondence with the plurality of baffles, each of the driving members is mounted on the housing and connected to the corresponding baffle, and the driving member is used to drive the baffle to rotate.

3. The coal blending system according to claim 2, characterized in that: The plurality of raw coal bins and the plurality of coal feeders are arranged at intervals in the horizontal direction, and the shell extends in the horizontal direction.

4. The coal blending system according to claim 2, characterized in that: The coal regulating device further comprises an air guide pipe, one end of which is used to communicate with the primary air system of the boiler, and a second end of which is communicated with the interior of the shell.

5. The coal blending system according to claim 1, characterized in that: The coal regulating device further comprises a rotary scraper blockage clearing device, and the rotary scraper blockage clearing device is arranged on the second discharge pipe.

6. The coal blending system according to claim 5, characterized in that: The second discharge pipe comprises an inclined section and a vertical section, the vertical section extends in a vertical direction, the inclined section extends obliquely, and an obtuse angle is formed between the inclined section and the vertical section; The inlet of the inclined section is connected to the side of the raw coal bin, the outlet of the inclined section is connected to the inlet of the vertical section, the outlet of the vertical section is located above the inlet of the third discharge pipe, and the rotating scraper clearing device is arranged on the vertical section.

7. The coal blending system according to claim 6, characterized in that: The second coal gate is arranged at the connection between the vertical section and the inclined section.

8. The coal blending system according to claim 6 or 7, characterized in that: The angle between the axial direction of the inclined section and the horizontal direction is 30° to 50°.

9. The coal blending system according to any one of claims 1 to 6, characterized in that: The coal adjusting device also includes a third coal gate, and the third coal gate is arranged on the third discharge pipe.

10. A thermal power unit, characterized in that: The invention comprises a boiler and a coal blending system as described in any one of claims 1 to 9.

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