Circulating fluidized bed coal feeder coal drop pipe monitoring device and method and design method

Abstract

The invention relates to a circulating fluidized bed coal feeder coal drop pipe monitoring device and method and a design method.The circulating fluidized bed coal feeder coal drop pipe monitoring device comprises a straight pipe section, an inclined pipe section, a fixing piece, a coal feeder and a hearth of a coal drop pipe, the coal feeder is arranged at the top of the straight pipe section, the hearth is arranged at the bottom of the inclined pipe section, and the bottom of the straight pipe section is connected to the top of the inclined pipe section; inspection holes are formed in the straight pipe section, the inclined pipe section and the joint of the straight pipe section and the inclined pipe section of the coal drop pipe respectively, and one end of each fixing piece is arranged in the corresponding inspection hole. Through the mechanism, the problem of coal blockage of the coal drop pipe of the circulating fluidized bed boiler when the proportion of coal slime in fire coal is increased and the total water content is large is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring the coal drop pipe of a coal feeder, and in particular to a monitoring device, method and design method for the coal drop pipe of a circulating fluidized bed coal feeder. Background Art

[0002] Circulating fluidized bed boilers have the characteristics of wide fuel adaptability, high combustion efficiency, and low nitrogen oxide emissions. In particular, their adaptability to inferior fuels has made them increasingly popular and widely used in thermal power plants and cogeneration companies.

[0003] During operation, circulating fluidized bed boilers often experience coal blockage in the coal drop pipe, resulting in boiler load fluctuations. In serious cases, the boiler is forced to reduce load, operate at reduced fire, or even extinguish the fire and stop the boiler, which seriously affects the economic operation of the boiler.

[0004] Especially in winter and summer when the rainy season comes, if the proportion of coal slime in the fuel coal increases and the total water content is large, it is easy to cause blockage of the circulating fluidized bed coal drop pipe. The initial blockage of the circulating fluidized bed coal drop pipe is difficult to judge from the pressure and local sound. If you are not careful, it will cause large-scale blockage of the coal drop pipe, posing a danger to the safe and environmentally friendly operation of the circulating fluidized bed boiler. There are also safety risks for maintenance personnel during the dredging process, which causes great difficulties for the maintenance work. Summary of the invention

[0005] The present invention provides a method for monitoring a coal drop pipe of a circulating fluidized bed coal feeder, which solves the problem of coal blockage in the coal drop pipe of a circulating fluidized bed boiler when the proportion of coal slime in the coal increases and the total water content is high.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] The coal dropping pipe comprises a straight pipe section and an inclined pipe section, a fixing part, a coal feeder and a furnace. A coal feeder is arranged on the top of the straight pipe section, a furnace is arranged on the bottom of the inclined pipe section, the bottom of the straight pipe section is connected to the top of the inclined pipe section, and inspection holes are respectively opened in the straight pipe section, the inclined pipe section and the connection between the straight pipe section and the inclined pipe section of the coal dropping pipe, and one end of the fixing part is arranged in the inspection hole.

[0008] The beneficial effect of adopting the above further scheme is that by opening multiple inspection holes in each section of the coal drop pipe for regular safety monitoring, the blockage of the circulating fluidized bed boiler coal drop pipe can be discovered in advance, reducing the frequency of blockage of the circulating fluidized bed boiler coal drop pipe. At the same time, this monitoring method has low cost and low installation difficulty, and the effect of preventing coal blockage in the coal drop pipe is significant.

[0009] Furthermore, a connecting piece is fixedly provided on the outer wall of the inspection hole, and the connecting piece has a through hole, and the diameter of the through hole is equal to that of the inspection hole.

[0010] The beneficial effect of adopting the above further scheme is that the through hole opened on the connecting piece is equal to the diameter of the inspection hole, so that when the fixing piece is inserted into the through hole and the inspection hole, no extra gap will be generated in the through hole or the inspection hole, thereby preventing coal ash from entering the through hole or the inspection hole and preventing the edge of the through hole or the inspection hole from being blocked.

[0011] Furthermore, the through hole has an internal thread, the fixing piece has an external thread, the fixing piece is threaded into the through hole, and one end of the fixing piece passes through the connecting piece and is inserted into the inspection hole.

[0012] The beneficial effect of adopting the above further solution is that the through hole has an internal thread, the fixing piece has an external thread, and the fixing piece and the connecting piece are detachably mounted, and can be disassembled, installed, and replaced at any time. At the same time, one end of the fixing piece is inserted into the inspection hole to prevent the coal ash in the coal drop pipe from clogging the inspection hole.

[0013] Furthermore, the inspection hole has an internal thread, the fixing piece has an external thread, and the fixing piece is screwed into the inspection hole.

[0014] The beneficial effect of adopting the above further solution is that the fixing piece has an external thread, and the fixing piece and the inspection hole are detachably mounted, and can be disassembled, installed, and replaced at any time. At the same time, one end of the fixing piece is inserted into the inspection hole to prevent the coal ash in the coal drop pipe from clogging the inspection hole.

[0015] Furthermore, one end of the fixing piece inserted into the inspection hole does not extend beyond the inner wall of the inspection hole.

[0016] The beneficial effect of adopting the above further solution is that the end of the fixing piece inserted into the inspection hole does not exceed the inner wall of the inspection hole, does not affect the smoothness of the inner wall of the coal drop pipe, and ensures smooth coal drop into the coal drop pipe.

[0017] Furthermore, a plurality of inspection holes are provided, and at least one inspection hole is provided in the straight pipe section, the inclined pipe section, and the connection between the straight pipe section and the inclined pipe section of the coal drop pipe.

[0018] The beneficial effect of adopting the above further scheme is that at least one inspection hole is opened in the straight pipe section, the inclined pipe section, and the connection between the straight pipe section and the inclined pipe section of the coal drop pipe to monitor the coal drop situation in each section of the coal drop pipe, so as to detect the location of coal drop blockage in advance.

[0019] Furthermore, the straight pipe section is provided with a plurality of the inspection holes at intervals, the inclined pipe section is provided with a plurality of the inspection holes at intervals, and a plurality of the inspection holes are circumferentially opened at the connection between the straight pipe section and the inclined pipe section.

[0020] The beneficial effect of adopting the above further scheme is that a plurality of inspection holes are intermittently provided in the straight pipe section of the coal dropping pipe, a plurality of inspection holes are intermittently provided in the inclined pipe section of the coal dropping pipe, and a plurality of inspection holes are circumferentially provided at the connection between the straight pipe section and the inclined pipe section of the coal dropping pipe, which are used to monitor the coal dropping situation of the straight pipe section of the coal dropping pipe, detect the position of the coal dropping blockage, and make a corresponding coal unblocking plan according to the monitoring results.

[0021] Further, check the moisture content of the coal slime of the blended coal. When the moisture content of the coal slime is less than the design value: the coal feeder operates normally, insert one end of the fixing part into the connecting part and the inspection hole, and connect it with the connecting part, and the end of the fixing part inserted into the inspection hole does not exceed the inner wall of the inspection hole.

[0022] The beneficial effect of adopting the above further scheme is that when the coal feeder operates normally, the end of the fixing piece inserted into the inspection hole does not exceed the inner wall of the inspection hole, does not affect the smoothness of the inner wall of the coal drop pipe, and ensures smooth coal falling into the coal drop pipe.

[0023] Furthermore, the moisture content of the coal slime of the blended coal is checked. When the moisture content of the coal slime is greater than the design value:

[0024] S1: coal feeder stopped;

[0025] S2: Unscrew multiple fixings;

[0026] S3: Use identification tools to reach into multiple inspection holes to determine the coal leakage on the wall of the coal pipe;

[0027] S4: When the identification tool has resistance when inserted into the inspection hole and the inspection hole leaks air, there is evidence of coal loosening on the wall of the coal drop pipe;

[0028] S5: Use tools to remove the loose coal from the inner wall of the coal drop pipe;

[0029] S6: When the identification tool has resistance when inserted into the inspection hole, and the inspection hole does not leak air, there is a sign of coal blocking on the wall of the coal drop pipe;

[0030] S7: Use a tool to reach into the coal drop pipe and remove the coal blocking the inner wall of the coal drop pipe;

[0031] S8: When the identification tool is inserted into the inspection hole without resistance and the inspection hole leaks air, there is no sign of loose coal on the wall of the coal drop pipe;

[0032] S9: Insert the fixing part into the connecting part and the inspection hole again, and connect it with the connecting part.

[0033] The beneficial effect of adopting the above further scheme is that by opening a plurality of inspection holes in each section of the coal drop pipe, the coal swelling condition of the pipe wall inside the coal drop pipe can be judged through the inspection holes using identification tools, and corresponding measures can be taken according to the judged conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a coal drop pipe monitoring device for a circulating fluidized bed coal feeder of the present invention;

[0035] Figure 2 It is a flow chart of a method for monitoring a coal drop pipe of a circulating fluidized bed coal feeder according to the present invention;

[0036] Figure 3 It is a data record of coal detection in a method for monitoring a coal drop pipe of a circulating fluidized bed coal feeder of the present invention;

[0037] Figure 4 The present invention discloses a method for monitoring a coal chute of a circulating fluidized bed coal feeder using a standard for fuel oil (GB252-2011).

[0038] In the attached drawings, the parts represented by the various reference numerals are listed as follows: 1. straight pipe section; 2. inclined pipe section; 3. inspection hole; 4. connecting piece; 5. fixing piece; 6. coal feeder; 7. furnace. DETAILED DESCRIPTION

[0039] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0040] Example 1

[0041] like Figure 1 As shown, the straight pipe section 1 and the inclined pipe section 2, the fixing part 5, the coal feeder 6 and the furnace 7 of the coal dropping pipe, the coal feeder 6 is arranged on the top of the straight pipe section 1, the furnace 7 is arranged on the bottom of the inclined pipe section 2, the bottom of the straight pipe section 1 is connected to the top of the inclined pipe section 2, and the straight pipe section 1, the inclined pipe section 2 and the connection between the straight pipe section 1 and the inclined pipe section 2 of the coal dropping pipe are respectively provided with inspection holes 3, and one end of the fixing part 5 is arranged in the inspection hole 3.

[0042] Specifically, by opening multiple inspection holes in each section of the coal drop pipe for regular safety monitoring, blockage of the circulating fluidized bed boiler coal drop pipe can be discovered in advance, reducing the frequency of blockage of the circulating fluidized bed boiler coal drop pipe. At the same time, this monitoring method has low cost and low installation difficulty, and is effective in preventing coal drop pipe blockage.

[0043] like Figure 1 As shown, a connecting member 4 is fixedly provided on the outer wall of the inspection hole 3 , and the connecting member 4 has a through hole, and the diameter of the through hole is equal to that of the inspection hole 3 .

[0044] Specifically, the through hole formed on the connecting member 4 is equal to the diameter of the inspection hole 3, so that the fixing member 5 can be inserted into the through hole and the inspection hole 3, and no extra gap will be generated in the through hole or the inspection hole 3, thereby preventing coal ash from entering the through hole or the inspection hole 3 and preventing the edge of the through hole or the inspection hole 3 from being blocked.

[0045] like Figure 1 As shown, the through hole has an internal thread, the fixing member 5 has an external thread, the fixing member 5 is screwed into the through hole, and one end of the fixing member 5 passes through the connecting member 4 and is inserted into the inspection hole 3.

[0046] Specifically, the through hole has an internal thread, and the fixing member 5 has an external thread. The fixing member 5 and the connecting member are detachably mounted and can be disassembled, installed, and replaced at any time. At the same time, one end of the fixing member is inserted into the inspection hole to prevent the coal ash in the coal drop pipe from clogging the inspection hole.

[0047] Furthermore, one end of the fixing piece inserted into the inspection hole does not extend beyond the inner wall of the inspection hole.

[0048] Specifically, one end of the fixing piece inserted into the inspection hole does not extend beyond the inner wall of the inspection hole, does not affect the smoothness of the inner wall of the coal drop pipe, and ensures smooth coal drop into the coal drop pipe.

[0049] Furthermore, a plurality of inspection holes (3) are provided, and at least one inspection hole (3) is provided in the straight pipe section (1), the inclined pipe section (2) and the connection between the straight pipe section (1) and the inclined pipe section (2) of the coal drop pipe.

[0050] Specifically, at least one inspection hole is provided in the straight pipe section, the inclined pipe section, and the connection between the straight pipe section and the inclined pipe section of the coal drop pipe for monitoring the coal drop conditions of each section of the coal drop pipe, so as to detect the location of coal drop blockage in advance.

[0051] Furthermore, the straight pipe section (1) is provided with a plurality of the inspection holes (3) at intervals, the inclined pipe section (2) is provided with a plurality of the inspection holes (3) at intervals, and a plurality of the inspection holes (3) are provided circumferentially at the connection between the straight pipe section (1) and the inclined pipe section (2).

[0052] Specifically, a plurality of inspection holes are intermittently provided in the straight pipe section of the coal dropping pipe, a plurality of inspection holes are intermittently provided in the inclined pipe section of the coal dropping pipe, and a plurality of inspection holes are circumferentially opened at the connection between the straight pipe section and the inclined pipe section of the coal dropping pipe, which are used to monitor the coal dropping situation of the straight pipe section of the coal dropping pipe, detect the position of the coal dropping blockage, and make corresponding coal unblocking plan according to the monitoring results.

[0053] The beneficial effect of this embodiment is that by opening a plurality of inspection holes 3 in each section of the coal drop pipe for regular safety monitoring, the blockage of the coal drop pipe of the circulating fluidized bed boiler can be discovered in advance, thereby reducing the frequency of blockage of the coal drop pipe of the circulating fluidized bed boiler. At the same time, this monitoring method has low cost and low installation difficulty, and has a significant effect in preventing the coal drop pipe from being blocked.

[0054] The working process of this embodiment is: when it is detected that the received basis moisture content of the coal slime is higher than 10%, the coal feeder 6 is stopped and the fixing part 5 is unscrewed, and a stylus or a steel bar similar to a stylus is inserted into the inspection hole 3 to determine the coal swelling condition of the coal drop pipe wall.

[0055] When there is resistance when inserting a stylus or a steel bar into the inspection hole 3, and the inspection hole 3 leaks air, there is a sign of loose coal on the wall of the coal drop pipe. Select some coal types with more gangue particles, and grind off the loose coal on the inner wall of the coal drop pipe with coal particles in the raw coal bin corresponding to the coal drop pipe, or knock on the wall of the coal drop pipe to knock off the loose coal on the inner wall of the coal drop pipe, or use the coal particles of the gangue to grind off the loose coal on the inner wall of the coal drop pipe and knock on the wall of the coal drop pipe to knock off the loose coal on the inner wall of the coal drop pipe.

[0056] When the listening needle or the steel bar has resistance when inserted into the inspection hole 3, and the inspection hole 3 does not leak air, there is a sign of coal blockage on the wall of the coal drop pipe. Use a tool to reach into the coal drop pipe to remove the coal blockage on the inner wall of the coal drop pipe.

[0057] When the identification tool is inserted into the inspection hole 3 without resistance and the inspection hole 3 leaks air, there is no sign of loose coal on the wall of the coal drop pipe. The fixing part 5 is inserted into the connecting part 4 and the inspection hole 3 again and connected to the connecting part 4, and the coal feeder is started to continue running.

[0058] Example 2

[0059] The difference from Example 1 is that:

[0060] like Figure 1 As shown, the inspection hole 3 has an internal thread, the fixing member 5 has an external thread, and the fixing member 5 is screwed into the inspection hole 3 .

[0061] Specifically, the length of the fixing member 5 is selected to be the same as the wall thickness of the coal drop pipe, and the fixing member 5 is threadedly connected to the inspection hole 3 .

[0062] The beneficial effect of this embodiment is that the fixing member 5 has an external thread, and the fixing member 5 and the inspection hole 3 are detachably mounted, and can be disassembled, installed, and replaced at any time. At the same time, one end of the fixing member is inserted into the inspection hole to prevent the coal ash in the coal drop pipe from clogging the inspection hole.

[0063] Example 3

[0064] like Figure 1-4 As shown, based on Example 1 or Example 2,

[0065] Check the moisture content of the coal slime of the blended coal. When the moisture content of the coal slime is less than the design value: the coal feeder operates normally, one end of the fixing part 5 is inserted into the connecting part 4 and the inspection hole 3, and connected to the connecting part 4, and the end of the fixing part 5 inserted into the inspection hole 3 does not exceed the inner wall of the inspection hole 3.

[0066] In this embodiment, the design value of coal slime moisture is Figure 3 , Figure 4 For example, when Figure 3 The received basis moisture content is lower than 10%, the coal slime moisture content is lower than the design value, and the coal feeder operates normally.

[0067] The beneficial effect of adopting the above scheme is that when the coal feeder 6 operates normally, the end of the fixing member 5 inserted into the inspection hole 3 does not exceed the inner wall of the inspection hole 3, does not affect the smoothness of the inner wall of the coal drop pipe, and ensures smooth coal drop into the coal drop pipe.

[0068] The working process of this embodiment is as follows: the coal feeder 6 operates normally, and one end of the fixing member 5 is inserted into the connecting member 4 and the inspection hole 3, and the fixing member 5 is connected to the connecting member 4 and the inspection hole 3. Alternatively, one end of the fixing member 5 is directly inserted into the inspection hole 3, and the fixing member 5 is connected to the inspection hole 3. And the end of the fixing member 5 inserted into the inspection hole 3 does not exceed the inner wall of the inspection hole 3.

[0069] Example 4

[0070] like Figure 1-4 As shown, based on Example 1 or Example 2,

[0071] Check the moisture content of the coal slime used for blending. When the moisture content of the coal slime is greater than the design value:

[0072] S1: coal feeder stopped;

[0073] S2: Unscrew the plurality of fixing members 5;

[0074] S3: Use a distinguishing tool to reach into the multiple inspection holes 3 to distinguish the coal on the wall of the coal drop pipe;

[0075] S4: When the identification tool has resistance when inserted into the inspection hole 3, and the inspection hole 3 leaks air, there is evidence of loose coal on the wall of the coal drop pipe;

[0076] S5: Use tools to remove the loose coal from the inner wall of the coal drop pipe;

[0077] S6: When the identification tool has resistance when inserted into the inspection hole 3, and the inspection hole 3 does not leak air, there is a sign of coal blocking on the wall of the coal drop pipe;

[0078] S7: Use a tool to reach into the coal drop pipe and remove the coal blocking the inner wall of the coal drop pipe;

[0079] S8: When the identification tool is inserted into the inspection hole 3 without resistance and the inspection hole 3 leaks air, there is no sign of loose coal on the wall of the coal drop pipe;

[0080] S9: insert the fixing member 5 into the connecting member 4 and the inspection hole 3 again, and connect the fixing member 5 with the connecting member 4.

[0081] In this embodiment, the design value of coal slime moisture is Figure 3 , Figure 4 For example, when Figure 3 The received basic moisture content is higher than 10%, which means the moisture content of the coal slime is greater than the design value. The moisture content of the coal slime exceeds the standard and the coal feeder needs to be stopped.

[0082] The beneficial effect of adopting the above scheme is that by opening a plurality of inspection holes 3 in each section of the coal drop pipe for regular safety monitoring, the blockage of the circulating fluidized bed boiler coal drop pipe can be discovered in advance, thereby reducing the frequency of blockage of the circulating fluidized bed boiler coal drop pipe. At the same time, this monitoring method has low cost and low installation difficulty, and has a significant effect in preventing coal blockage in the coal drop pipe.

[0083] The working process of this embodiment is: when it is detected that the received basis moisture content of the coal slime is higher than 10%, the coal feeder 6 is stopped and the fixing part 5 is unscrewed, and a stylus or a steel bar similar to a stylus is inserted into the inspection hole 3 to determine the coal swelling condition of the coal drop pipe wall.

[0084] When there is resistance when inserting a stylus or a steel bar into the inspection hole 3, and the inspection hole 3 leaks air, there is a sign of loose coal on the wall of the coal drop pipe. Select some coal types with more gangue particles, and grind off the loose coal on the inner wall of the coal drop pipe with coal particles in the raw coal bin corresponding to the coal drop pipe, or knock on the wall of the coal drop pipe to knock off the loose coal on the inner wall of the coal drop pipe, or use the coal particles of the gangue to grind off the loose coal on the inner wall of the coal drop pipe and knock on the wall of the coal drop pipe to knock off the loose coal on the inner wall of the coal drop pipe.

[0085] When the listening needle or the steel bar has resistance when inserted into the inspection hole 3, and the inspection hole 3 does not leak air, there is a sign of coal blockage on the wall of the coal drop pipe. Use a tool to reach into the coal drop pipe to remove the coal blockage on the inner wall of the coal drop pipe.

[0086] When the identification tool is inserted into the inspection hole 3 without resistance and the inspection hole 3 leaks air, there is no sign of loose coal on the wall of the coal drop pipe. The fixing part 5 is inserted into the connecting part 4 and the inspection hole 3 again and connected to the connecting part 4, and the coal feeder is started to continue running.

[0087] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0088] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0089] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0090] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0092] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A circulating fluidized bed coal feeder coal drop pipe monitoring device, characterized in that: The invention comprises a straight pipe section (1) and an inclined pipe section (2) of a coal drop pipe, a fixing part (5), a coal feeder (6) and a furnace (7); the top of the straight pipe section (1) is provided with a coal feeder (6); the bottom of the inclined pipe section (2) is provided with a furnace (7); the bottom of the straight pipe section (1) is connected to the top of the inclined pipe section (2); inspection holes (3) are respectively provided in the straight pipe section (1), the inclined pipe section (2) and the connection between the straight pipe section (1) and the inclined pipe section (2); one end of the fixing part (5) is provided in the inspection hole (3).

2. A circulating fluidized bed coal feeder coal drop pipe monitoring device according to claim 1, characterized in that: A connecting piece (4) is fixedly arranged on the outer wall of the inspection hole (3), and the connecting piece (4) has a through hole, and the diameter of the through hole is equal to that of the inspection hole (3).

3. A circulating fluidized bed coal feeder coal drop pipe monitoring device according to claim 2, characterized in that: The through hole has an internal thread, the fixing member (5) has an external thread, the fixing member (5) is screwed into the through hole, and one end of the fixing member (5) passes through the connecting member (4) and is inserted into the inspection hole (3).

4. The monitoring device for the coal drop pipe of a circulating fluidized bed coal feeder according to claim 1, characterized in that: The inspection hole (3) has an internal thread, the fixing member (5) has an external thread, and the fixing member (5) is screwed into the inspection hole (3).

5. A circulating fluidized bed coal feeder coal drop pipe monitoring device according to claim 3 or 4, characterized in that: One end of the fixing member (5) inserted into the inspection hole (3) does not extend beyond the inner wall of the inspection hole (3).

6. A design method for a monitoring device for a coal drop pipe of a circulating fluidized bed coal feeder, characterized in that: A circulating fluidized bed coal feeder coal chute monitoring device is designed as described in any one of claims 1 to 5, wherein a plurality of inspection holes (3) are provided, and at least one inspection hole (3) is provided in the straight pipe section (1), the inclined pipe section (2) and the connection between the straight pipe section (1) and the inclined pipe section (2) of the coal chute.

7. The design method of a monitoring device for a coal drop pipe of a circulating fluidized bed coal feeder according to claim 6 is characterized in that: The straight pipe section (1) is provided with a plurality of inspection holes (3) at intervals, the inclined pipe section (2) is provided with a plurality of inspection holes (3) at intervals, and a plurality of inspection holes (3) are provided circumferentially at the connection between the straight pipe section (1) and the inclined pipe section (2).

8. A method for monitoring the coal drop pipe of a circulating fluidized bed coal feeder, characterized in that: Based on the coal drop pipe monitoring device for a circulating fluidized bed coal feeder according to any one of claims 1 to 5, Check the moisture content of the coal slime used for blending. When the moisture content of the coal slime is less than the design value: The coal feeder operates normally, one end of the fixing member (5) is inserted into the connecting member (4) and the inspection hole (3), and connected to the connecting member (4), and the end of the fixing member (5) inserted into the inspection hole (3) does not extend beyond the inner wall of the inspection hole (3).

9. A method for monitoring a coal drop pipe of a circulating fluidized bed coal feeder, characterized in that: Based on the coal drop pipe monitoring device for a circulating fluidized bed coal feeder according to any one of claims 1 to 5, Check the moisture content of the coal slime used for blending. When the moisture content of the coal slime is greater than the design value: S1: coal feeder stopped; S2: Unscrewing a plurality of fixing parts (5); S3: Using a distinguishing tool, insert it into the multiple inspection holes (3) to distinguish the coal piled up on the wall of the coal drop pipe; S4: When the identification tool has resistance when inserted into the inspection hole (3), and the inspection hole (3) leaks air, there is evidence of loose coal on the wall of the coal drop pipe; S5: Use tools to remove the loose coal from the inner wall of the coal drop pipe; S6: When the identification tool has resistance when inserted into the inspection hole (3), and the inspection hole (3) does not leak air, there is a sign of coal blocking on the wall of the coal drop pipe; S7: Use a tool to reach into the coal drop pipe and remove the coal blocking the inner wall of the coal drop pipe; S8: When the identification tool is inserted into the inspection hole (3) without resistance and the inspection hole (3) leaks air, there is no sign of loose coal on the wall of the coal drop pipe; S9: Insert the fixing member (5) into the connecting member (4) and the inspection hole (3) again, and connect the fixing member (5) with the connecting member (4).

Images