Flue gas sampling device of circulating fluidized bed unit

Abstract

The invention discloses a flue gas sampling device of a circulating fluidized bed unit, which comprises a flue gas pipe provided with a sampling port; the sealing and opening mechanism comprises an inner cavity piece arranged in the sampling opening, a sealing piece fixedly arranged in the inner cavity piece, and a moving piece arranged in the inner cavity piece in a sliding manner; the sampling mechanism comprises a stretching-in head and an extension pipe connected with the stretching-in head; and when the moving part enters the inner side of the sealing part, the moving part and the sealing part are sealed. The sampling port is located at the position, close to the second connecting end, of the flue gas pipe, a flue gas sample is extracted from the flue gas pipe, NOx concentration detection is conducted through a CEMS instrument, the influence of a urea solution in a unit on a detection result can be avoided, and therefore accurate detection data are obtained.

Description

Technical Field

[0001] The invention relates to the technical field of forest stand growth models, and in particular to a flue gas sampling device for a circulating fluidized bed unit. Background Art

[0002] The circulating fluidized bed unit is a device that uses fluidized bed technology to generate heat and power. The unit burns solid particles (such as coal, biomass, etc.) with air in a fluidized state to produce high-temperature and high-pressure combustion products and heat energy.

[0003] In order to understand the emission of circulating fluidized bed units, it is necessary to monitor the NO content of flue gas emitted by circulating fluidized bed units. x However, in the existing circulating fluidized bed unit, there is no relevant flue gas sampling device to monitor the original NO x The concentration at the economizer outlet in the prior art will be affected by the urea solution in the unit. Summary of the invention

[0004] In view of the problem of inaccurate monitoring in the existing flue gas sampling device of the circulating fluidized bed unit, the present invention is proposed.

[0005] Therefore, an object of the present invention is to provide a flue gas sampling device for a circulating fluidized bed unit.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a flue gas sampling device for a circulating fluidized bed unit, comprising a flue gas pipe, wherein the flue gas pipe is provided with a sampling port; a sealing mechanism, comprising an inner cavity member arranged inside the sampling port, a closing member fixedly arranged inside the inner cavity member, and a moving member slidably arranged inside the inner cavity member; and a sampling mechanism, comprising an insertion head, and an extension tube connected to the insertion head; when the moving member enters the inner side of the closing member, the moving member and the closing member complete the sealing.

[0007] As a preferred embodiment of the flue gas sampling device for the circulating fluidized bed unit of the present invention, the inner cavity member has an upper opening and a lower opening, the upper opening is located at the end of the inner cavity member close to the flue gas pipe, and the lower opening is located at the end of the inner cavity member away from the flue gas pipe; the closing member has a closed cavity, and a protruding opening is provided at the end of the closed cavity adjacent to the lower opening; a protruding end is provided at one end of the movable member adjacent to the through opening, and a connecting opening is provided on the radial outer wall of the protruding end.

[0008] As a preferred solution of the flue gas sampling device for the circulating fluidized bed unit of the present invention, the moving part has a contact end, and a first elastic part is arranged inside the inner cavity part; the contact end contacts with the first elastic part.

[0009] As a preferred solution of the flue gas sampling device of the circulating fluidized bed unit described in the present invention, it also includes a positioning mechanism; it includes a fixed ring, which is fixed to the inside of the sampling port; a rotating buckle, which is rotatably installed on the fixed ring; a pushing member, which is in contact with the rotating buckle; a limiting ring is fixed inside the sampling port, a second elastic member is arranged between the limiting ring and the inner cavity member, and a bottom buckle is fixed to the inner cavity member; the bottom buckle is in contact with the rotating buckle.

[0010] As a preferred solution of the flue gas sampling device of the circulating fluidized bed unit described in the present invention, wherein: a groove is opened on the fixed ring, and an inner column is installed inside the groove of the fixed ring; one end of the rotating buckle is a buckling end, and the other end of the rotating buckle is a force-bearing end.

[0011] As a preferred solution of the flue gas sampling device of the circulating fluidized bed unit described in the present invention, a through groove is provided on the rotating buckle; the pushing member includes a through column passing through the through groove, and a third elastic member is arranged on the through column, and the third elastic member is in contact with the force-bearing end of the rotating buckle.

[0012] As a preferred solution of the flue gas sampling device of the circulating fluidized bed unit described in the present invention, it also includes a locking mechanism; it also includes a fourth elastic member, which is arranged on the inner side of the sampling port; a clamping block, which is in contact with the fourth elastic member; a locking groove is provided on the rotating buckle, and when the clamping block can be inserted into the inner side of the locking groove, the rotating buckle cannot rotate.

[0013] As a preferred solution of the flue gas sampling device for the circulating fluidized bed unit of the present invention, the bottom buckle has a corresponding head corresponding to the position of the card block, and the bottom buckle also has a fitting side that abuts against the rotating buckle.

[0014] As a preferred solution of the flue gas sampling device for the circulating fluidized bed unit of the present invention, the sampling mechanism also includes a pushing shell arranged on the insertion head, the sampling mechanism enters the inner side of the sampling port, and the pushing shell can push the inner cavity.

[0015] As a preferred solution of the flue gas sampling device for the circulating fluidized bed unit of the present invention, wherein: the pushing shell is fixed with a limiting column, a swivel is rotatably installed on the insertion head, and a through hole is opened on the swivel.

[0016] The beneficial effects of the present invention are as follows: the sampling port is located on the smoke pipe near the second connection end, and smoke samples are drawn from the smoke pipe, and NO is measured by the CEMS instrument. x The concentration detection can avoid the influence of urea solution in the unit on the test results, thus obtaining accurate test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0018] Figure 1 It is a schematic diagram of the overall structure of the flue gas sampling device of the circulating fluidized bed unit of the present invention.

[0019] Figure 2 It is a schematic diagram of the sampling port structure described in the present invention.

[0020] Figure 3 It is a schematic diagram of the sealing and opening mechanism structure described in the present invention.

[0021] Figure 4 It is a schematic diagram of the positioning mechanism structure described in the present invention.

[0022] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle.

[0023] Figure 6 It is a schematic diagram of the sampling mechanism and sampling port structure in the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the sampling mechanism described in the present invention. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0029] Example 1

[0030] Reference Figures 1 to 4 , provides a flue gas sampling device for a circulating fluidized bed unit, including a flue gas pipe 100, the flue gas pipe 100 is provided with a sampling port 101; the flue gas pipe 100 has two connecting ends, namely a first connecting end and a second connecting end, the first connecting end is connected to a position 1.5 to 2 m upstream of a separator inlet spray gun, and the second connecting end is connected to an economizer outlet position, the flue gas pipe 100 is made of high temperature resistant stainless steel material, the sampling port 101 is located on the flue gas pipe 100 near the second connecting end, a flue gas sample is extracted from the flue gas pipe 100, and NO is measured by a CEMS instrument x The concentration detection can avoid the influence of urea solution in the unit on the test results, so as to obtain accurate test data.

[0031] The flue gas sampling device of the circulating fluidized bed unit includes a sealing mechanism 200, including an inner cavity part 201 arranged inside the sampling port 101, a closing part 202 fixedly arranged inside the inner cavity part 201, and a moving part 203 slidably arranged inside the inner cavity part 201; and, in a natural state, the moving part 203 is located on the inner side of the closing part 202, and when the moving part 203 enters the inner side of the closing part 202, the moving part 203 and the closing part 202 complete the sealing, so in a natural state, the moving part 203 and the closing part 202 complete the sealing of the sampling port 101, so that the flue gas inside the flue pipe 100 cannot leak out from the sampling port 101, thereby improving the sealing performance of the entire flue pipe 100.

[0032] The flue gas sampling device of the circulating fluidized bed unit includes a sampling mechanism 300, including an insertion head 301, and an extension tube 302 connected to the insertion head 301; the insertion head 301 of the sampling mechanism 300 can be inserted into the inner side of the inner cavity 201, and the insertion head 301 can push the moving part 203 and the closing part 202 to separate. At this time, the closing part 202 and the moving part 203 are no longer in a closed state, and the flue gas inside the flue pipe 100 can enter the interior of the extension tube 302 through the insertion head 301, thereby completing the sampling work.

[0033] Specifically, the inner cavity part 201 has an upper opening 201a and a lower opening 201b, the upper opening 201a is located at the end of the inner cavity part 201 close to the smoke pipe 100, and the lower opening 201b is located at the end of the inner cavity part 201 away from the smoke pipe 100; when the closing part 202 and the moving part 203 are in a closed state, the smoke cannot pass through the upper opening 201a to reach the lower opening 201b, and when the closing part 202 and the moving part 203 are in an open state, the smoke can enter the upper opening 201a through the smoke pipe 100 and reach the lower opening 201b.

[0034] The closing member 202 has a closing cavity 202a, and a protruding opening 202b is provided at the end of the closing cavity 202a adjacent to the lower opening 201b; the moving member 203 is provided with a protruding end 203a at one end adjacent to the through opening, and a connecting opening 203b is provided on the radial outer wall of the protruding end 203a.

[0035] The closed cavity 202a is cylindrical, and the protruding end 203a of the moving part 203 is also cylindrical. When the moving part 203 enters the inner side of the closed cavity 202a, the radial outer wall of the protruding end 203a of the moving part 203 fits with the radial inner wall of the closed cavity 202a, and the end of the protruding end 203a of the moving part 203 closes the protruding opening 202b, so that the moving part 203 and the closing part 202 are in a closed state, so that the smoke cannot be discharged from the sampling port 101. When the insertion head 301 enters the inner side of the inner cavity part 201, it can push the moving part 203, so that the moving part 203 and the closed cavity 202a are separated. At this time, the connecting opening 203b of the moving part 203 is no longer blocked by the closing part 202. At this time, the smoke inside the smoke pipe 100 can enter the inner side of the insertion head 301 through the connecting opening 203b, and the sampling work can be completed.

[0036] Furthermore, the moving member 203 has a contact end 203 c , and a first elastic member 204 is disposed inside the inner cavity member 201 ; the contact end 203 c contacts the first elastic member 204 .

[0037] When the insertion head 301 is taken out, the insertion head 301 no longer pushes the moving member 203 , and the first elastic member 204 pushes the moving member 203 to re-enter the inner side of the closed cavity 202 a , so that the sampling port 101 is re-closed.

[0038] Example 2

[0039] Reference Figures 3 to 5This embodiment is different from the first embodiment in that: the flue gas sampling device of the circulating fluidized bed unit also includes a positioning mechanism 400; it includes a fixed ring 401, which is fixed to the inside of the sampling port 101; a rotating buckle 402, which is rotatably installed on the fixed ring 401; a pushing member 403, which conflicts with the rotating buckle 402; a limiting ring 207 is fixed inside the sampling port 101, a second elastic member 205 is provided between the limiting ring 207 and the inner cavity member 201, and a bottom buckle 206 is fixed to the inner cavity member 201; the bottom buckle 206 conflicts with the rotating buckle 402.

[0040] During the sampling process, the insertion head 301 can be positioned by the positioning mechanism 400 , so that during the sampling process, the insertion head 301 can be stably located inside the sampling port 101 .

[0041] When the insertion head 301 enters the inner side of the sampling port 101, the insertion head 301 can push the inner cavity part 201. After being compressed, the inner cavity part 201 will press the second elastic part 205, causing the second elastic part 205 to deform. At this time, the inner cavity part 201 moves upward, which can drive the bottom buckle 206 to move upward, thereby causing the bottom buckle 206 and the rotating buckle 402 to disengage. In this case, the pushing member 403 can push the rotating buckle 402 to rotate, and the rotation of the rotating buckle 402 will buckle the insertion head 301, so that the insertion head 301 can be stably located on the inner side of the sampling port 101.

[0042] Specifically, a groove 401a is formed on the fixing ring 401, and an inner column 401b is installed inside the groove 401a of the fixing ring 401; one end of the rotating buckle 402 is a buckling end 402a, and the other end of the rotating buckle 402 is a force-bearing end 402b.

[0043] The buckling end 402 a has a certain curvature, which can effectively buckle the insertion head 301 , and the force-bearing end 402 b is used to contact with the pushing member 403 .

[0044] Furthermore, a through slot 402 c is formed on the rotating buckle 402 ; the pushing member 403 includes a through column 403 a passing through the through slot 402 c , and a third elastic member 403 b is disposed on the through column 403 a , and the third elastic member 403 b abuts against the force-bearing end 402 b of the rotating buckle 402 .

[0045] At the end of the through column 403a, a convex ring is provided, and a third elastic member 403b is provided between the convex ring and the rotating buckle 402. The force end 402b and the third elastic member 403b are in conflict with each other. In a natural state, the bottom buckle 206 is in conflict with the force end 402b, so that the rotating buckle 402 cannot rotate. When the inner cavity part 201 is pushed, the bottom buckle 206 and the force end 402b are separated. In this case, the third elastic member 403b pushes the rotating buckle 402 to rotate, thereby completing the buckle connection of the insertion head 301, so that the insertion head 301 can be stably located on the inner side of the sampling port 101. In this case, the smoke inside the smoke pipe 100 can enter the inner side of the insertion head 301 through the sampling port 101, thereby completing the sampling work.

[0046] The rest of the structure is the same as that of Example 1.

[0047] Example 3

[0048] Reference Figures 2 to 6 This embodiment is different from the above embodiments in that: the flue gas sampling device of the circulating fluidized bed unit also includes a locking mechanism 500; it also includes a fourth elastic member 501, which is arranged on the inner side of the sampling port 101; a clamping block 502, which is in conflict with the fourth elastic member 501; a locking groove 402d is provided on the rotating buckle 402, and when the clamping block 502 can be inserted into the inner side of the locking groove 402d, the rotating buckle 402 cannot rotate.

[0049] When the insertion head 301 enters the inner side of the sampling port 101, it can push the inner cavity part 201 to move. During this process, the moving part 203 drives the bottom buckle 206 to move upward, and the bottom buckle 206 and the rotating buckle 402 are separated. In the absence of the limitation of the bottom buckle 206, the third elastic part 403b pushes the force-bearing end 402b to make the buckling end 402a rotate. During the rotation of the rotating buckle 402, the force-bearing end 402b and the block 502 collide, so that the block 502 squeezes the fourth elastic part 501. When the position of the block 502 corresponds to the position of the locking groove 402d, the fourth elastic part 501 can push the block 502 to enter the inner side of the locking groove 402d, thereby completing the positioning of the rotating buckle 402, so that the rotating buckle 402 can stably buckle the insertion head 301 to prevent the insertion head 301 from separating from the sampling port 101.

[0050] Specifically, the bottom buckle 206 has a corresponding head 206a corresponding to the position of the block 502, and the bottom buckle 206 also has a fitting side 206b that abuts against the rotating buckle 402. The fitting side 206b of the bottom buckle 206 can fit the rotating buckle 402, and the rotating buckle 402 contacts the fitting side 206b, which can prevent the third elastic member 403b from pushing the rotating buckle 402.

[0051] The function of the corresponding head 206a is to unlock. When the inner cavity part 201 moves downward, the inner cavity part 201 can drive the bottom buckle 206 to move downward. During this process, the corresponding head 206a will contact and push the column of the side wall of the block 502, so that the block 502 disengages from the locking groove 402d, and then the bottom buckle 206 continues to move downward to push and push the rotating buckle 402. The rotating buckle 402 is pushed back to its original position by the bottom buckle 206, so that the fitting side 206b of the bottom buckle 206 contacts the rotating buckle 402 again.

[0052] The rest of the structure is the same as that of Example 2.

[0053] Example 4

[0054] Reference Figures 4 to 7 This embodiment is different from the above embodiments in that the sampling mechanism 300 also includes a pushing shell 303 arranged on the insertion head 301 , and the sampling mechanism 300 enters the inner side of the sampling port 101 , and the pushing shell 303 can push the inner cavity 201 .

[0055] In this embodiment, the function of the pushing shell 303 is to push the inner cavity part 201, and the insertion head 301 can enter the inner side of the inner cavity part 201 through the protruding opening 202b, and the moving part 203 is pushed by the insertion head 301, so that the moving part 203 and the closing part 202 are separated, so that the smoke inside the smoke pipe 100 can enter the inner side of the insertion head 301 through the upper opening 201a.

[0056] When the insertion head 301 continues to move, the pushing shell 303 will contact and push the inner cavity part 201. The inner cavity part 201 moves upward, which will drive the bottom buckle 206 to move upward, thereby unlocking the rotating buckle 402, so that the rotating buckle 402 rotates and buckles the insertion head 301. During this process, the second elastic part 205 is compressed.

[0057] When the rotating buckle 402 is pushed by the third elastic member 403b, the force-bearing end 402b is in an inclined state. When the bottom buckle 206 moves downward, it presses the force-bearing end 402b, so that the force-bearing end 402b drives the rotating buckle 402 to rotate and reset.

[0058] Furthermore, a limiting column 304 is fixed on the pushing shell 303 , and a rotating ring 305 is rotatably installed on the insertion head 301 , and a through hole 306 is opened on the rotating ring 305 .

[0059] After the sampling is completed, in order to complete the unlocking of the insertion head 301 by the unlocking mechanism, the rotating ring 305 is rotated. During the rotation of the rotating ring 305, the position of the through hole 306 corresponds to the position of the limiting column 304, and the compressed second elastic member 205 can push the inner cavity member 201 to move, and the inner cavity member 201 moves downward. During this process, the bottom buckle 206 will press the force-bearing end 402b, so that the rotating buckle 402 rotates and resets until the fitting side 206b of the bottom buckle 206 contacts the force-bearing end 402b again, thereby completing the unlocking and resetting.

[0060] The rest of the structure is the same as that of Example 3.

[0061] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0062] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0063] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0064] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A flue gas sampling device for a circulating fluidized bed unit, characterized in that: include, A flue gas pipe (100), wherein the flue gas pipe (100) is provided with a sampling port (101); The sealing and opening mechanism (200) comprises an inner cavity part (201) arranged inside the sampling port (101), a sealing part (202) fixedly arranged inside the inner cavity part (201), and a moving part (203) slidably arranged inside the inner cavity part (201); and, A sampling mechanism (300) comprises an insertion head (301) and an extension tube (302) connected to the insertion head (301); When the moving member (203) enters the inner side of the closing member (202), the moving member (203) and the closing member (202) complete the closing.

2. The flue gas sampling device for a circulating fluidized bed unit according to claim 1, characterized in that: The inner cavity member (201) has an upper opening (201a) and a lower opening (201b), wherein the upper opening (201a) is located at an end of the inner cavity member (201) close to the smoke pipe (100), and the lower opening (201b) is located at an end of the inner cavity member (201) far from the smoke pipe (100); The closing member (202) has a closing cavity (202a), and a protruding opening (202b) is provided at the end of the closing cavity (202a) adjacent to the lower opening (201b); The moving member (203) is provided with a protruding end (203a) at one end adjacent to the through opening, and a communicating opening (203b) is provided on a radial outer wall of the protruding end (203a).

3. The flue gas sampling device for a circulating fluidized bed unit according to claim 2, characterized in that: The moving part (203) has a contact end (203c), and a first elastic part (204) is provided inside the inner cavity part (201); The abutting end (203c) abuts against the first elastic member (204).

4. The flue gas sampling device for a circulating fluidized bed unit according to claim 2 or 3, characterized in that: Also included is a positioning mechanism (400); which includes, A fixing ring (401) fixed inside the sampling port (101); A rotating buckle (402) rotatably mounted on the fixing ring (401); A pushing member (403) which abuts against the rotating buckle (402); A limiting ring (207) is fixed inside the sampling port (101), a second elastic member (205) is provided between the limiting ring (207) and the inner cavity member (201), and a bottom buckle (206) is fixed to the inner cavity member (201); The bottom buckle (206) is in conflict with the rotating buckle (402).

5. The flue gas sampling device for a circulating fluidized bed unit according to claim 4, characterized in that: The fixing ring (401) is provided with a groove (401a), and the fixing ring (401) is provided with an inner column (401b) inside the groove (401a); One end of the rotating buckle (402) is a buckling end (402a), and the other end of the rotating buckle (402) is a force-bearing end (402b).

6. The flue gas sampling device for a circulating fluidized bed unit according to claim 5, characterized in that: The rotating buckle (402) is provided with a through slot (402c); The pushing member (403) comprises a through column (403a) passing through the through slot (402c), and a third elastic member (403b) is arranged on the through column (403a), and the third elastic member (403b) contacts the force-bearing end (402b) of the rotating buckle (402).

7. The flue gas sampling device for a circulating fluidized bed unit according to claim 5 or 6, characterized in that: Also includes a locking mechanism (500); it also includes, A fourth elastic member (501) is disposed on the inner side of the sampling port (101); A block (502) which abuts against the fourth elastic member (501); The rotating buckle (402) is provided with a locking groove (402d), and when the clamping block (502) can be inserted into the inner side of the locking groove (402d), the rotating buckle (402) cannot rotate.

8. The flue gas sampling device for a circulating fluidized bed unit according to claim 7, characterized in that: The bottom buckle (206) has a corresponding head (206a) corresponding to the position of the clamping block (502), and the bottom buckle (206) also has a fitting side (206b) that abuts against the rotating buckle (402).

9. The flue gas sampling device for a circulating fluidized bed unit according to claim 8, characterized in that: The sampling mechanism (300) further comprises a pushing shell (303) arranged on the insertion head (301); the sampling mechanism (300) enters the inner side of the sampling port (101); and the pushing shell (303) is capable of pushing the inner cavity (201).

10. The flue gas sampling device for a circulating fluidized bed unit according to claim 9, characterized in that: The pushing shell (303) is fixed with a limiting column (304), and a rotating ring (305) is rotatably mounted on the insertion head (301), and a through hole (306) is provided on the rotating ring (305).

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