Denitration flue gas continuous sampling device for coal-fired power plant

Abstract

The utility model discloses a coal-fired power plant denitration flue gas continuous sampling device, which comprises a sampling pipe, two ends of the sampling pipe are not sealed, a fixed rod is fixedly connected in the sampling pipe, a detector is fixedly connected on the outer side of the fixed rod, a filter screen is arranged in the sampling pipe, and the filter screen is fixedly connected with the fixed rod. A double-shaft motor is fixedly connected to the inner side of the filter screen, rotating plates are fixedly connected to the outer sides of two output shafts of the double-shaft motor, the side walls of the rotating plates are slidably sleeved with square rods, the square rods penetrate through the rotating plates, and contact plates are fixedly connected to the sides, close to the filter screen, of the square rods. The control panel is driven by the double-shaft motor, the rotating plate, the square rod and the contact plate to rotate, and then the control panel can move back and forth in the rotating process under the action of the contact rod and the circular plate, so that the side wall of the filter screen is simply cleaned, the cleanliness of the filter screen is ensured, and the normal working effect of the filter screen is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of coal-fired power plants, in particular to a continuous sampling device for denitrification flue gas in coal-fired power plants. Background Art

[0002] After searching, a Chinese patent with the authorization publication number CN220188143U discloses a continuous sampling device for denitrification flue gas in a coal-fired power plant, including a flue pipe, two groups of sampling guns are connected to the outside of the flue pipe, a filter element is arranged inside the upper end of the sampling gun, a connecting pipe is connected to the outer side of the upper end of the sampling gun, a connecting pipe is arranged at the upper end of the connecting pipe, a flow pipe is also arranged on the upper part of the connecting pipe, and the flow pipe is located at the lower side of the electronic valve, and a closer is arranged at the connection between the connecting pipe and the flow pipe. The continuous sampling device for denitrification flue gas in a coal-fired power plant realizes automatic switching of the sampling filter element by setting two groups of sampling guns and using purge gas to realize continuous sampling during the purge period, thereby avoiding the monitoring time blind spot of the CEMS caused by periodic purge.

[0003] However, in the actual working process, only periodic purging is used for treatment, and the dust in the filtered flue gas will still accumulate on the outside of the filter, thereby affecting the normal filtering effect of the filter, and finally resulting in a time measurement blind spot, and the effect of timely detection is not achieved. Therefore, a continuous sampling device for denitrification flue gas in a coal-fired power plant is provided. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art, such as: only using a periodic purging method for treatment, the dust in the filtered flue gas will still accumulate on the outside of the filter, thereby affecting the normal filtering effect of the filter, and finally resulting in a time measurement blind spot, and failing to achieve the effect of timely detection, and a continuous sampling device for denitrification flue gas in a coal-fired power plant is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A continuous sampling device for denitrification flue gas in a coal-fired power plant comprises a sampling tube, both ends of the sampling tube are unsealed, a fixed rod is fixedly connected inside the sampling tube, a detector is fixedly connected to the outside of the fixed rod, a filter is installed in the sampling tube, a double-axis motor is fixedly connected to the inside of the filter, a rotating plate is fixedly connected to the outside of two output shafts of the double-axis motor, a side wall sliding sleeve of the rotating plate is provided with a square rod, the square rod penetrates the rotating plate, a contact plate is fixedly connected to the side of the square rod close to the filter, the contact plate is connected to the rotating plate through a first spring, an arc groove is provided on the side of the contact plate close to the filter, an arc rod is fixedly connected in the arc groove, a slider is provided on the outer sliding sleeve of the arc rod, the slider is connected to the inner wall of the arc groove through a second spring, and the slider is slidably connected to the inner wall of the arc groove, a control plate is fixedly connected to the side of the slider away from the contact plate, a plurality of control rods are fixedly connected to the side of the control plate close to the filter, and the plurality of control rods are arranged relative to the filter.

[0007] Preferably, a contact rod is fixedly connected to one side of the square rod away from the filter screen, and a plurality of circular plates are fixedly connected to the inner wall of the sampling tube in the circumferential direction, and the contact rod and the circular plates abut against each other.

[0008] Preferably, the outer fixed sleeve of the rotating plate is provided with a rotating ring, and the rotating ring is rotatably connected to the inner side of the sampling tube.

[0009] Preferably, a fixed box is fixedly connected to the lower side of the sampling tube, and the fixed box is communicated with the sampling tube through two through grooves, the two through grooves are located between the rotating ring and the filter screen, a switch plate is slidably connected in the two through grooves, a connecting rod is fixedly connected to the upper side of the switch plate, a top plate is fixedly connected to the upper side of the connecting rod, the top plate and the contact plate are arranged opposite to each other, two gear rods are symmetrically fixedly connected in the two through grooves, the two gear rods are located on the upper side of the switch plate and abut against the switch plate, and a limiting plate is fixedly connected to the lower side of the switch plate.

[0010] Preferably, the limit plate is fixedly connected with a pull rod on both sides, the outer side of the pull rod is slidably sleeved with a fixed cylinder, the fixed cylinder is fixedly connected to the outer side of the sampling tube, and the pull rod is connected to the bottom of the fixed cylinder through a third spring.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. First, the dual-axis motor, rotating plate, square rod and contact plate drive the control plate to rotate. Then, under the action of the contact rod and circular plate, the control plate will move back and forth during the rotation process, thereby completing a simple cleaning operation on the side wall of the filter screen to ensure the cleanliness of the filter screen and thus ensure the normal working effect of the filter screen;

[0013] 2. Under the action of the control rod, when the control panel moves and rotates, the control rod is driven to move and rotate accordingly, thereby completing the dredging operation of the filter, reducing the possibility of filter clogging, and thus ensuring the normal working effect of the filter;

[0014] 3. During the rotation of the contact plate, when the contact plate and the top plate are against each other, the top plate will be driven to move downward, and finally the switch plate will be driven to move downward, so that the through slot is opened, and the particulate matter inside the sampling tube can enter the fixed box from the sampling tube, further ensuring the filtering effect of the filter and reducing the impact on subsequent detection operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a continuous sampling device for denitrification flue gas in a coal-fired power plant proposed by the utility model;

[0016] Figure 2 This is a schematic diagram of the internal connection of a sampling tube in a continuous sampling device for denitrification flue gas in a coal-fired power plant proposed by the utility model;

[0017] Figure 3 This is a cross-sectional connection diagram of a rotating ring in a continuous sampling device for denitrification flue gas in a coal-fired power plant proposed by the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of a contact plate in a continuous sampling device for denitrification flue gas in a coal-fired power plant proposed by the utility model;

[0019] Figure 5 This is a schematic diagram of the connection between the top plate and the through slot in a continuous sampling device for denitrification flue gas in a coal-fired power plant proposed by the utility model;

[0020] Figure 6 The utility model provides a cross-sectional connection diagram of a through slot in a continuous sampling device for denitrification flue gas in a coal-fired power plant.

[0021] In the figure: 1 sampling tube, 2 fixed box, 3 round plate, 4 rotating ring, 5 detector, 6 fixed rod, 7 filter, 8 double-axis motor, 9 rotating plate, 10 square rod, 11 contact rod, 12 first spring, 13 contact plate, 14 control plate, 15 control rod, 16 arc groove, 17 arc rod, 18 slider, 19 second spring, 20 top plate, 21 through groove, 22 connecting rod, 23 gear lever, 24 switch plate, 25 limit plate, 26 pull rod, 27 third spring, 28 fixed cylinder. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] Reference Figure 1-Figure 6 A continuous sampling device for denitrification flue gas in a coal-fired power plant comprises a sampling tube 1, both ends of the sampling tube 1 are not sealed, a fixed rod 6 is fixedly connected inside the sampling tube 1, a detector 5 is fixedly connected to the outside of the fixed rod 6, a filter screen 7 is installed inside the sampling tube 1, a double-axis motor 8 is fixedly connected to the inside of the filter screen 7, a rotating plate 9 is fixedly connected to the outside of two output shafts of the double-axis motor 8, a side wall sliding sleeve of the rotating plate 9 is provided with a square rod 10, the square rod 10 is arranged to penetrate the rotating plate 9, a side of the square rod 10 close to the filter screen 7 is fixedly connected to a contact plate 13, and a contact plate 13 is fixedly connected to the side of the square rod 10 close to the filter screen 7. The plate 13 is connected to the rotating plate 9 through the first spring 12, and an arc groove 16 is provided on the side of the contact plate 13 close to the filter screen 7, and an arc rod 17 is fixedly connected in the arc groove 16, and a slider 18 is provided on the outer sliding sleeve of the arc rod 17, and the slider 18 is connected to the inner wall of the arc groove 16 through the second spring 19, and the slider 18 is slidably connected to the inner wall of the arc groove 16, and the slider 18 is fixedly connected to the control plate 14 on the side away from the contact plate 13, and a plurality of control rods 15 are fixedly connected to the side of the control plate 14 close to the filter screen 7, and the plurality of control rods 15 are arranged relative to the filter screen 7;

[0024] A contact rod 11 is fixedly connected to one side of the square rod 10 away from the filter screen 7, and a plurality of circular plates 3 are fixedly connected to the inner wall of the sampling tube 1 in the circumferential direction. The contact rod 11 and the circular plates 3 are against each other. When the dual-axis motor 8 is working, the rotating plate 9 rotates, and the rotating plate 9 drives the contact rod 11 to move through the square rod 10. During the rotation of the contact rod 11, with the assistance of the first spring 12, since the contact rod 11 is always against the side wall of the circular plate 3, the contact rod 11 will also move back and forth relative to the sampling tube 1 during the rotation process.

[0025] The outer fixed sleeve of the rotating plate 9 is provided with a rotating ring 4, and the rotating ring 4 is rotatably connected to the inner side of the sampling tube 1. Under the action of the rotating ring 4, the rotating plate 9 can only rotate relative to the sampling tube 1, thereby completing the operation of limiting the movement trajectory of the rotating plate 9;

[0026] A fixed box 2 is fixedly connected to the lower side of the sampling tube 1, and the fixed box 2 is communicated with the sampling tube 1 through two through grooves 21. The two through grooves 21 are arranged between the rotating ring 4 and the filter screen 7. A switch plate 24 is slidably connected in the two through grooves 21. A connecting rod 22 is fixedly connected to the upper side of the switch plate 24. A top plate 20 is fixedly connected to the upper side of the connecting rod 22. The top plate 20 and the contact plate 13 are arranged opposite to each other. Two shift rods 23 are symmetrically fixedly connected in the two through grooves 21. The two shift rods 23 are located on the upper side of the switch plate 24 and abut against the switch plate 24. A limiting plate 25 is fixedly connected to the lower side of the switch plate 24. First, under the action of the shift rod 23, a simple limiting operation on the position of the switch plate 24 is completed. Then, when the switch plate 24 is located in the through groove 21, the switch plate 24 and the through groove 21 are clearance-matched, and the through groove 21 can be sealed.

[0027] Pull rods 26 are fixedly connected to the left and right sides of the limit plate 25. A fixed cylinder 28 is slidably sleeved on the outer side of the pull rod 26. The fixed cylinder 28 is fixedly connected to the outer side of the sampling tube 1. The pull rod 26 is connected to the bottom of the fixed cylinder 28 through a third spring 27. Under the action of the third spring 27, the switch plate 24 is always in the through groove 21, and the closing operation of the through groove 21 is completed without the influence of other mechanisms.

[0028] In the present invention, when sampling operation is needed, the specific operation is as follows: the sampling tube 1 is installed at the discharge port of the denitrification flue gas, the detector 5 is started, and the detection operation of the gas to be measured in the flue gas is started. The above are all existing technologies and no unnecessary details are given. In the process of gas detection, the dual-axis motor 8 is started, and the dual-axis motor 8 drives the rotating plate 9 to rotate. The rotating plate 9 rotates through the first spring 12 and the contact plate 13. The contact plate 13 drives the control plate 14 to rotate through the arc rod 17 and the slider 18. The control plate 14 and the filter screen 7 are against each other, thereby completing the wiping and cleaning operation of the filter screen 7. In this process, under the auxiliary action of the first spring 12, the contact rod 11 is always against the circular plate 3. Therefore, the contact rod 11 will continue to move back and forth relative to the sampling tube 1 during the rotation process. The contact rod 11 drives the arc rod 17 to move back and forth through the square rod 10 and the contact plate 13. The arc rod 17 drives the slider 18 The control plate 14 and the control rod 15 move, and the control rod 15 enters the filter screen 7 to complete a simple unblocking operation on the filter screen 7. When the control rod 15 enters the filter screen 7, the control rod 15 will not rotate relative to the contact plate 13, and the control rod 15 drives the slider 18 to rotate, compressing or stretching the corresponding second spring 19. When the control rod 15 moves out of the filter screen 7, under the action of the second spring 19, the control rod 15 and the control plate 14 return to their original positions relative to the contact plate 13, which is convenient for the next unblocking operation on the filter screen 7. During the rotation of the contact plate 13, the contact plate 13 and the top plate 20 abut against each other, which will drive the connecting rod 22 and the switch plate 24 to move downward, and the switch plate 24 drives the limit plate 25 and the pull rod 26 to move downward, and the pull rod 26 stretches the third spring 27, and the switch plate 24 moves out of the through groove 21, and the particles inside the sampling tube 1 enter the fixed box 2 from the through groove 21, thereby reducing the adverse effects on normal gas detection.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A continuous sampling device for denitrification flue gas in a coal-fired power plant, comprising a sampling tube (1), characterized in that: Both ends of the sampling tube (1) are not sealed. A fixing rod (6) is fixedly connected inside the sampling tube (1). A detector (5) is fixedly connected to the outside of the fixing rod (6). A filter screen (7) is installed inside the sampling tube (1). A dual-axis motor (8) is fixedly connected to the inside of the filter screen (7). A rotating plate (9) is fixedly connected to the outside of two output shafts of the dual-axis motor (8). A square rod (10) is provided on the side wall sliding sleeve of the rotating plate (9). The square rod (10) penetrates the rotating plate (9). A contact plate (13) is fixedly connected to the side of the square rod (10) close to the filter screen (7). The contact plate (13) is supported by a first spring (12) and a second spring (13). The contact plate (13) is connected to a rotating plate (9), a side of the contact plate (13) close to the filter screen (7) is provided with an arc groove (16), an arc rod (17) is fixedly connected in the arc groove (16), a sliding block (18) is provided on the outer sliding sleeve of the arc rod (17), the sliding block (18) is connected to the inner wall of the arc groove (16) through a second spring (19), and the sliding block (18) is slidably connected to the inner wall of the arc groove (16), a side of the sliding block (18) away from the contact plate (13) is fixedly connected to a control plate (14), a side of the control plate (14) close to the filter screen (7) is fixedly connected to a plurality of control rods (15), and the plurality of control rods (15) and the filter screen (7) are arranged relative to each other.

2. A continuous sampling device for denitrification flue gas in a coal-fired power plant according to claim 1, characterized in that: A contact rod (11) is fixedly connected to the side of the square rod (10) away from the filter screen (7), and a plurality of circular plates (3) are fixedly connected to the inner wall of the sampling tube (1) in the circumferential direction, and the contact rod (11) and the circular plates (3) are in contact with each other.

3. A continuous sampling device for denitrification flue gas in a coal-fired power plant according to claim 1, characterized in that: The outer fixed sleeve of the rotating plate (9) is provided with a rotating ring (4), and the rotating ring (4) is rotatably connected to the inner side of the sampling tube (1).

4. A continuous sampling device for denitrification flue gas in a coal-fired power plant according to claim 3, characterized in that: A fixing box (2) is fixedly connected to the lower side of the sampling tube (1), and the fixing box (2) is connected to the sampling tube (1) via two through grooves (21). The two through grooves (21) are arranged between the rotating ring (4) and the filter screen (7). A switch plate (24) is slidably connected in the two through grooves (21). A connecting rod (22) is fixedly connected to the upper side of the switch plate (24). A top plate (20) is fixedly connected to the upper side of the connecting rod (22). The top plate (20) and the contact plate (13) are arranged opposite to each other. Two shift rods (23) are symmetrically fixedly connected in the two through grooves (21). The two shift rods (23) are located on the upper side of the switch plate (24) and abut against the switch plate (24). A limit plate (25) is fixedly connected to the lower side of the switch plate (24).

5. A continuous sampling device for denitrification flue gas in a coal-fired power plant according to claim 4, characterized in that: The limit plate (25) is fixedly connected to a pull rod (26) on both the left and right sides. A fixed cylinder (28) is slidably sleeved up and down on the outer side of the pull rod (26). The fixed cylinder (28) is fixedly connected to the outer side of the sampling tube (1). The pull rod (26) is connected to the bottom of the fixed cylinder (28) via a third spring (27).

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