System and method for detecting exhaust emission of power plant

Abstract

The invention relates to the technical field of waste gas detection, in particular to a power plant waste gas emission detection system and method.The power plant waste gas emission detection system comprises a supporting cylinder, an air inlet pipe is arranged at the bottom of the supporting cylinder, an air outlet is formed in the upper end of the supporting cylinder, a driving shaft rotationally penetrates through the supporting cylinder, and a sliding cylinder in threaded connection with the driving shaft is slidably arranged in the supporting cylinder; the filter disc intercepts and collects particulate matters in waste gas, gas penetrates through the filter disc and enters the sliding cylinder, the collecting frame is rotationally connected with the interior of the supporting cylinder and rotates in the supporting cylinder, and a scraping plate arranged on the collecting frame scrapes off the particulate matters intercepted on the filter disc; and the particulate matters fall into the collection frame. The moving stroke of the sliding cylinder is the same every time, which means that the amount of waste gas sucked into the supporting cylinder every time is relatively the same, the design ensures that the amount of the waste gas sampled and detected every time is consistent, and the stability and the reliability of a detection result are improved.

Description

Technical Field

[0001] The present application relates to the technical field of exhaust gas detection, and in particular to a system and method for detecting exhaust gas emissions from power plants. Background Art

[0002] As the main energy supply facility, the impact of exhaust gas emitted by power plants on the atmospheric environment and human health has attracted increasing attention. Power plants, especially coal-fired and oil-fired power plants, produce a large amount of pollutants during the production process. These pollutants not only cause environmental problems such as acid rain and photochemical smog, but also cause health problems such as respiratory diseases and cardiovascular diseases.

[0003] The detection of waste gas emissions from power plants is an important means to ensure environmental quality and public health. Through advanced online monitoring technology, analysis technology and data management technology, power plants can monitor the concentration of pollutants in waste gas in real time and continuously to ensure that emissions meet environmental standards. For example, the waste gas emission compliance detection device with publication number CN110940775B, which involves the field of waste gas emission technology, includes a shell; a side cover is fixed on the outside of the shell by bolts; a sensor mounting hole is provided to provide the detection device with the function of installing sensors, and the device used can be flexibly changed according to different waste gas components for real-time detection. Real-time detection can ensure the uniformity of sampling. At the same time, the detection device is set as a branch, and the passage can be closed when not in use. At the same time, an acceleration device is set in the main pipeline to assist in accelerating the movement speed of the waste gas for detection.

[0004] However, the above existing technologies still have some defects when detecting exhaust gas from power plants:

[0005] The above-mentioned prior art can intercept and adsorb substances in the exhaust gas by setting a filter, and then the sampling tube can be connected to the water pipe to flush the filter for sampling. However, due to the continuous accumulation of particulate matter on the filter, the total amount of exhaust gas passing through the filter and the concentration of particulate matter will change with time, which results in the particulate matter sample obtained during sampling can only reflect the instantaneous concentration at a certain moment, and cannot represent the average concentration of the entire monitoring period. This deviation makes the sampling results can only be used for qualitative analysis (such as judging whether there are harmful substances), but cannot be used for accurate quantitative analysis (such as determining the concentration of harmful substances), so that the sampling results lack the basis for quantitative analysis.

[0006] At the same time, the exhaust gas may also contain a variety of gaseous harmful substances, which the filter cannot collect. This limitation not only affects the accuracy and reliability of the test results, but also limits the efficiency and applicability of the device in practical applications.

[0007] Based on this, and in accordance with the above-mentioned viewpoints, there is still room for improvement in the existing technology for detecting exhaust gas from power plants. Summary of the invention

[0008] In order to solve the above technical problems, the present application provides a power plant exhaust emission detection system and method, which adopts the following technical solutions:

[0009] In a first aspect, a power plant exhaust emission detection system comprises a support tube, an air inlet pipe is arranged at the bottom of the support tube, an air outlet is opened at the upper end of the support tube, a drive shaft is rotatably penetrated in the support tube, a sliding tube threadedly connected with the drive shaft is slidably arranged in the support tube, a check valve is arranged at the upper end of the sliding tube, and a sampling detector is arranged in the sliding tube;

[0010] The sampling detector comprises a filter disc arranged at the lower end of the sliding cylinder, the filter disc is slidably connected to the driving shaft, a transmission shaft is rotatably arranged at the lower end of the driving shaft, and the lower end of the transmission shaft rotatably penetrates the supporting cylinder.

[0011] Preferably, the sampling detector includes a transmission slot on the transmission shaft, a driving slot corresponding to the transmission slot is provided on the driving shaft, a pin block corresponding to the driving slot is slidably arranged in the transmission slot, and a return spring is arranged between the lower end of the pin block and the transmission slot.

[0012] Preferably, a rotating ring corresponding to the pin block is rotatably provided at the lower end of the filter disc.

[0013] Preferably, the transmission shaft is provided with a collection frame rotatably connected to the support tube, a rotating screw is rotatably penetrated in the collection frame, and the rotating screw is provided with a spiral blade located in the collection frame.

[0014] Preferably, a scraper is provided on the collection frame.

[0015] Preferably, a driving gear is provided at one end of the rotating screw, and a gear ring meshing with the driving gear is provided on the inner side of the supporting tube.

[0016] Preferably, a discharge hole is provided on one side of the collection frame, and a conveying hole connected to the discharge hole is provided on the transmission shaft.

[0017] Preferably, a condensation collector is provided in the sliding cylinder;

[0018] The condensation collector comprises a partition plate arranged in the sliding cylinder, a condensation plate located below the partition plate is arranged in the sliding cylinder, and a condensation chamber is formed between the condensation plate and the partition plate;

[0019] A heat insulation plate is arranged in the sliding cylinder and is located below the condensation plate, and a cooling chamber is formed between the heat insulation plate and the condensation plate.

[0020] Preferably, a connecting pipe is provided between the condensing plate and the heat insulating plate, and a bending section communicating with the condensing chamber is provided at the upper end of the connecting pipe.

[0021] In a second aspect, a method for detecting exhaust gas emissions from a power plant is provided, and the method of using the method comprises the following steps:

[0022] S1: Exhaust gas inhalation. When detecting the exhaust gas of a power plant, the driving shaft is first rotated, and the rotating driving shaft drives the sliding cylinder to move up and down in the supporting cylinder;

[0023] S2: Exhaust gas discharge. When the sliding cylinder moves upward, the exhaust gas is sucked into the lower part of the sliding cylinder in the support cylinder through the air inlet pipe. The one-way valve prevents the exhaust gas from flowing back. Therefore, the gas passes through the check valve from the sliding cylinder and enters the upper part of the sliding cylinder, and then is discharged from the air outlet opened at the upper end of the support cylinder.

[0024] S3: Filtration sampling. When the sliding cylinder moves downward, the exhaust gas entering the support cylinder first passes through the filter plate. The filter plate intercepts and collects the particulate matter in the exhaust gas, while the gas passes through the filter plate into the sliding cylinder and then passes through the check valve and is discharged from the outlet.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. The filter disc of the present invention intercepts and collects the particles in the exhaust gas, and the gas will pass through the filter disc into the sliding cylinder. The collection frame rotates in the support cylinder by connecting with the support cylinder. The scraper provided on the collection frame will scrape the intercepted particles on the filter disc and make the particles fall into the collection frame. The movement stroke of the sliding cylinder is the same each time, which means that the amount of exhaust gas sucked into the support cylinder each time is relatively the same. This design ensures that the amount of exhaust gas sampled and tested each time is consistent, and improves the stability and reliability of the test results.

[0027] 2. In the present invention, the exhaust gas filtered by the filter plate will come into contact with the condensation plate, and the moisture in the exhaust gas will condense and support the moisture. Since the condensation plate is inclined toward the drainage hole opened on one side of the sliding cylinder, the moisture will pass through the drainage hole and enter into the connecting pipe corresponding to the drainage hole connected to the supporting cylinder. The connecting pipe is connected to the detection equipment, and the moisture will be detected by the detection equipment and sampled. Since the moving stroke of the sliding cylinder is fixed, the amount of exhaust gas inhaled each time is consistent, and the amount of particulate matter intercepted by the filter plate is proportional to the content of particulate matter in the exhaust gas. It is connected to the existing detection equipment through the conveying hole, and the collected particulate matter is quantitatively analyzed to obtain the content of particulate matter in the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Figure 2 It is a structural schematic diagram of the support tube of the present invention.

[0030] Figure 3 It is a schematic diagram of the structure of the sampling detector of the present invention.

[0031] Figure 4 It is a cross-sectional view of the sliding cylinder and the sampling detector of the present invention

[0032] Figure 5 It is a structural schematic diagram of the acquisition frame of the present invention.

[0033] Figure 6 The present invention Figure 5 A partial enlarged view of point A in the middle.

[0034] Figure 7 The present invention Figure 5 A partial enlarged view of point B in the middle.

[0035] Figure 8 It is a schematic diagram of the structure between the discharge hole and the delivery hole of the present invention.

[0036] Fig. 9 The present invention Figure 8 A partial enlarged view of point C in the middle.

[0037] Fig.10 It is a structural schematic diagram of the condensation collector of the present invention.

[0038] Fig.11 It is a cross-sectional view of the condensation collector of the present invention.

[0039] Fig.12 It is a schematic diagram of the structure between the sliding cylinder and the condensation collector of the present invention.

[0040] Fig.13 It is a cross-sectional view of a water storage tank of the present invention.

[0041] Fig.14 The present invention Fig.13 A partial enlarged view of point D in the middle.

[0042] Description of reference numerals: 1, support cylinder; 11, air outlet; 2, air inlet pipe; 3, drive shaft; 4, sliding cylinder; 41, check valve; 5, sampling detector; 51, filter plate; 52, transmission shaft; 53, transmission slide; 54, driving slide; 55, pin block; 56, return spring; 57, rotating ring; 6, collection frame; 61, rotating screw rod; 611, spiral blade; 62, driving gear; 63, gear ring; 64 , discharge hole; 65, conveying hole; 66, scraper; 7, condensation collector; 71, partition plate; 72, condensation plate; 73, condensation chamber; 74, insulation plate; 75, cooling chamber; 76, connecting pipe; 77, bending section; 78, exhaust hole; 8, water storage tank; 81, sliding plate; 82, upper chamber; 83, lower chamber; 84, connecting rod; 85, water inlet hole; 86, water outlet hole; 87, drainage hole; 88, connecting pipe. DETAILED DESCRIPTION

[0043] The following is combined with Figures 1 to 14 This application is described in further detail.

[0044] The embodiment of the present application discloses a system and method for detecting waste gas emissions from a power plant, which achieves quantitative detection by inhaling a certain amount of waste gas each time, intercepting and sampling particulate matter in the waste gas, and then condensing the particulate matter to condense the moisture in the waste gas.

[0045] Embodiment 1:

[0046] Reference Figure 1 , Figure 2 and Figure 3 As shown, a power plant exhaust emission detection system includes a support tube 1, a driving shaft 3 is rotatably penetrated in the support tube 1, and a sliding tube 4 threadedly connected to the driving shaft 3 is slidably arranged in the support tube 1.

[0047] When detecting the exhaust gas from a power plant, the air inlet pipe 2 arranged at the bottom of the support tube 1 is connected to the exhaust chimney, and then the drive shaft 3 is driven to rotate through the existing driving technology. The rotating drive shaft 3 will drive the sliding tube 4 to move up and down reciprocatingly in the support tube 1 through a threaded connection.

[0048] During the reciprocating movement of the sliding cylinder 4, when the sliding cylinder 4 moves upward, the check valve 41 arranged at the upper end of the sliding cylinder 4 will close the sliding cylinder 4, thereby forming a negative pressure in the support cylinder 1, and the exhaust gas discharged from the power plant is sucked into the support cylinder 1 below the sliding cylinder 4 through the air inlet pipe 2. At the same time, a one-way valve (not shown in the figure here) is arranged in the air inlet pipe. When the sliding cylinder 4 moves downward, the check valve 41 opens, and the one-way valve prevents the exhaust gas from flowing back, so the gas will pass through the check valve 41 from the sliding cylinder 4, thereby entering the top of the sliding cylinder 4, and then be discharged from the outlet 11 opened at the upper end of the support cylinder 1.

[0049] When the exhaust gas passes through the sliding cylinder 4 , the sampling detector 5 disposed in the sliding cylinder 4 will collect particulate matter in the exhaust gas and perform sampling detection on the collected particulate matter.

[0050] Reference Figure 4 , Figure 4 and Figure 5 As shown, specifically, the sampling detector 5 includes a filter disc 51 arranged at the lower end of the sliding cylinder 4, the filter disc 51 is slidably connected to the driving shaft 3, a transmission shaft 52 is rotatably arranged at the lower end of the driving shaft 3, the lower end of the transmission shaft 52 rotates and penetrates the supporting cylinder 1, and the transmission shaft 52 is connected to the bottom of the supporting cylinder 1 through a volute spring (not shown in the figure).

[0051] When the drive shaft 3 rotates and drives the sliding cylinder 4 to move downward, the exhaust gas entering the support cylinder 1 will first pass through the filter disc 51, and the filter disc 51 will intercept and collect particulate matter in the exhaust gas, while the gas will pass through the filter disc 51 into the sliding cylinder 4, and then pass through the check valve 41 and be discharged from the outlet 11.

[0052] Reference Figure 5 , Figure 6 and Figure 7 As shown, the sampling detector 5 includes a transmission slot 53 provided on the transmission shaft 52, a driving slot 54 corresponding to the transmission slot 53 is provided on the driving shaft 3, a pin block 55 corresponding to the driving slot 54 is slidably provided in the transmission slot 53, and a return spring 56 is provided between the lower end of the pin block 55 and the transmission slot 53.

[0053] The return spring 56 will press against the pin block 55, so that the pin block 55 is always pinned into the driving slide groove 54. When the driving shaft 3 rotates to drive the sliding cylinder 4 to move downward, the driving shaft 3 will drive the transmission shaft 52 to rotate together through the pin block 55, and the rotating transmission shaft 52 drives the volute spring to tighten.

[0054] When the filter disc 51 moves downward with the sliding cylinder 4, the filter disc 51 will drive the rotating ring 57 corresponding to the pin block 55 at its lower end to rotate and move together. When the sliding cylinder 4 moves to the lower side of the supporting cylinder 1, the driving shaft 3 stops rotating. At this time, when the rotating ring 57 contacts the pin block 55, the rotating ring 57 will push the pin block 55 to move toward the pin so that the pin block 55 exits the driving slide groove 54.

[0055] The tightened volute spring will then diverge, and the divergent volute spring will drive the transmission shaft 52 to rotate, and the transmission shaft 52 will drive the collection frame 6 set thereon, so that the collection frame 6 rotates in the support tube 1 through a rotation connection with the support tube 1, and the scraper 66 set on the collection frame 6 will scrape off the intercepted particles on the filter disc 51, so that the particles fall into the collection frame 6.

[0056] At the same time, the rotating screw rod 61 that rotates and passes through the collection frame 6 will rotate together with the collection frame 6. The rotating rotating screw rod will drive the driving gear 62 set at one end. Through the gear ring 63 set on the inner side of the support tube 1 and meshing with the driving gear 62, the driving gear 62 drives the rotating screw rod 61 to rotate. The rotating screw rod 61 will drive the spiral blade 611 set thereon. The spiral blade 611 is located in the collection frame 6 to transport the particles falling into the collection frame 6 to the discharge hole 64 opened on one side of the collection frame 6.

[0057] Reference Figure 8 and Fig. 9 As shown, since the transmission shaft 52 is provided with a conveying hole 65 connected to the discharge hole 64, the particles passing through the discharge hole 64 will enter the conveying hole 65, and be connected to the existing detection equipment through the conveying hole 65 to detect the collected particles.

[0058] When the sliding cylinder 4 moves upward, the rotating ring 57 is separated from the pin block 55, and the compressed return spring 56 pushes the pin block 55 to be pinned into the driving slide groove 54, so that the transmission shaft 52 and the driving shaft 3 rotate together to tighten the spiral spring again.

[0059] The movement stroke of the sliding cylinder 4 is the same each time, which means that the amount of exhaust gas sucked into the supporting cylinder 1 each time is relatively the same. This design ensures that the amount of exhaust gas sampled and tested each time is consistent, thereby improving the stability and reliability of the test results.

[0060] Since the moving stroke of the sliding cylinder 4 is fixed, the amount of exhaust gas inhaled each time is consistent, and the amount of particulate matter intercepted by the filter disc 51 is proportional to the particulate matter content in the exhaust gas. It is connected to the existing detection equipment through the delivery hole 65 to perform quantitative analysis on the collected particulate matter to obtain the particulate matter content in the exhaust gas.

[0061] Embodiment 2:

[0062] Reference Fig.10 , Fig.11 , Fig.12 , Fig.13 and Fig.14 As shown, on the basis of the first embodiment, a condensation collector 7 is provided in the sliding cylinder 4, and the condensation collector 7 processes the filtered exhaust gas and collects the moisture in the exhaust gas for sampling and detection.

[0063] Specifically, the condensation collector 7 includes a partition plate 71 arranged in the sliding cylinder 4, a condensation plate 72 located below the partition plate 71 is arranged in the sliding cylinder 4, a condensation chamber 73 is formed between the condensation plate 72 and the partition plate 71, a heat insulation plate 74 is arranged below the condensation plate 72 in the sliding cylinder 4, a connecting pipe 76 is passed through the partition plate 71, the condensation plate 72 and the heat insulation plate 74, and a bending section 77 connected to the condensation chamber 73 is arranged at the upper end of the connecting pipe 76.

[0064] A cooling chamber 75 is formed between the heat insulation plate 74 and the condensation plate 72 . A coolant is injected into the cooling chamber 75 . The coolant cools the condensation plate 72 , so that the condensation plate 72 is kept at a low temperature.

[0065] When the sliding cylinder 4 moves downward, the exhaust gas passes through the filter plate and the particulate matter in the exhaust gas is intercepted, and then the exhaust gas enters the connecting pipe 76, and then passes through the bending section 77 to enter the condensation chamber 73, and then is discharged from a plurality of exhaust holes 78 opened on the partition plate 71, and then passes through the check valve 41 and is discharged from the outlet 11.

[0066] During this process, the exhaust gas filtered by the filter plate will come into contact with the condensation plate 72, and the moisture in the exhaust gas will condense into water. Since the condensation plate 72 is inclined toward the drainage hole 87 opened on one side of the sliding cylinder 4, the moisture will gather towards the drainage hole 87.

[0067] When the sliding cylinder 4 moves to the bottom of the supporting cylinder 1, the connecting tube 88 connected on the supporting cylinder 1 will be connected to each other by corresponding to the drainage hole 87. At this time, moisture will pass through the drainage hole 87 and enter the connecting tube 88 connected on the supporting cylinder 1 corresponding to the drainage hole 87. The connecting tube 88 is connected to the existing detection equipment, and the moisture will be detected by the detection equipment and sampled.

[0068] Among them, a water tank 8 is arranged at the upper end of the support tube 1, and coolant is injected into the water tank 8. A sliding plate 81 is slidably arranged in the water tank 8, and the sliding plate 81 separates the narrative release into an upper chamber 82 and a lower chamber 83. A connecting rod 84 is arranged on the sliding plate 81, and the lower end of the connecting rod passes through the cooling chamber 75 and is connected to the condensation plate 72. A water inlet hole 85 connecting the cooling chamber 75 and the upper chamber 82 is opened on the connecting rod 84, and a water outlet hole 86 connecting the cooling chamber 75 and the lower chamber 83 is opened on the connecting rod 84.

[0069] During the repeated movement of the sliding cylinder 4, the connecting rod 84 will be driven to move together, and the connecting rod 84 will drive the sliding plate to move together. When the sliding plate 81 moves upward, the space of the upper chamber 82 is compressed and the space of the lower chamber 83 is expanded accordingly. At this time, the coolant in the upper chamber 82 will pass through the water inlet hole 85 into the cooling chamber 75, and the coolant in the cooling chamber 75 will pass through the water outlet hole 86 into the lower chamber 83; conversely, when the sliding plate 81 moves downward, the space of the lower chamber 83 is compressed and the space of the upper chamber 82 is expanded accordingly. At this time, the coolant in the lower chamber 83 will pass through the water outlet hole 86 into the cooling chamber 75, and the coolant in the cooling chamber 75 will pass through the water inlet hole 85 into the upper chamber 82, thereby circulating.

[0070] During the circulation process, the cooling liquid in the water storage tank 8 is cooled by the cooling equipment to ensure that the cooling liquid in the cooling chamber 75 is always in a low temperature state, so as to achieve cooling of the condensation plate 72 .

[0071] Finally, the present invention also provides a method for detecting exhaust gas emissions from a power plant, and the method for using the method comprises the following steps:

[0072] S1: Exhaust gas inhalation. When detecting the exhaust gas of a power plant, the driving shaft 3 is first rotated, and the rotating driving shaft 3 drives the sliding cylinder 4 to move up and down in the supporting cylinder 1.

[0073] S2: Exhaust gas is discharged. When the sliding cylinder 4 moves upward, the exhaust gas is sucked into the lower part of the sliding cylinder 4 in the supporting cylinder 1 through the air inlet pipe 2, and the one-way valve will prevent the exhaust gas from flowing back, so the gas will pass through the check valve 41 from the sliding cylinder, thereby entering the upper part of the sliding cylinder 4, and then discharged from the air outlet 11 opened at the upper end of the supporting cylinder 1.

[0074] S3: Filtration sampling. When the sliding cylinder 4 moves downward, the exhaust gas entering the supporting cylinder 1 will first pass through the filter disc 51. The filter disc 51 intercepts and collects the particulate matter in the exhaust gas, while the gas will pass through the filter disc 51 into the sliding cylinder 4, and then pass through the check valve 41 and be discharged from the air outlet 11.

[0075] S4: Coaxial linkage, the moving shaft will drive the transmission shaft 52 to rotate together through the pin block 55, and the rotating transmission shaft 52 drives the scroll spring to tighten. When the sliding cylinder 4 moves to the lower side of the supporting cylinder 1, the driving shaft 3 stops rotating. At this time, when the rotating ring 57 contacts the pin block 55, the rotating ring 57 will push the pin block 55 to move toward the pin so that the pin block 55 exits the driving slide groove 54.

[0076] S5: Condensation sampling, then the tightened scroll spring will diverge, the diverging scroll spring will drive the transmission shaft 52 to rotate, the transmission shaft 52 will drive the collection frame 6 set thereon, so that the collection frame 6 can rotate in the support tube 1 through the rotation connection with the support tube 1, and the scraper 66 set on the collection frame 6 will scrape the intercepted particles on the filter disc 51, so that the particles fall into the collection frame 6.

[0077] S6: synchronous sampling, the exhaust gas filtered by the filter plate will contact the condensation plate 72, and the moisture in the exhaust gas will condense into water. Since the condensation plate 72 is inclined toward the drainage hole 87 opened on one side of the sliding cylinder 4, the moisture will gather towards the drainage hole 87.

[0078] When the sliding cylinder 4 moves to the bottom of the supporting cylinder 1, the connecting tube 88 connected on the supporting cylinder 1 will be connected to each other by corresponding to the drainage hole 87. At this time, moisture will pass through the drainage hole 87 and enter the connecting tube 88 connected on the supporting cylinder 1 corresponding to the drainage hole 87. The connecting tube 88 is connected to the existing detection equipment, and the moisture will be detected by the detection equipment and sampled.

[0079] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power plant exhaust emission detection system, comprising a support tube (1), wherein an air inlet pipe (2) is arranged at the bottom of the support tube (1), and an air outlet (11) is opened at the upper end of the support tube (1), characterized in that: A driving shaft (3) is rotatably inserted into the support cylinder (1), a sliding cylinder (4) threadedly connected to the driving shaft (3) is slidably arranged in the support cylinder (1), a check valve (41) is arranged at the upper end of the sliding cylinder (4), and a sampling detector (5) is arranged in the sliding cylinder (4); The sampling detector (5) comprises a filter disc (51) arranged at the lower end of the sliding cylinder (4), the filter disc (51) being slidably connected to the driving shaft (3), a transmission shaft (52) being rotatably arranged at the lower end of the driving shaft (3), and the lower end of the transmission shaft (52) rotatably penetrates the supporting cylinder (1).

2. A power plant exhaust emission detection system according to claim 1, characterized in that: The sampling detector (5) comprises a transmission slide groove (53) provided on a transmission shaft (52), a driving slide groove (54) corresponding to the transmission slide groove (53) provided on the driving shaft (3), a pin block (55) corresponding to the driving slide groove (54) slidably provided in the transmission slide groove (53), and a return spring (56) is provided between the lower end of the pin block (55) and the transmission slide groove (53).

3. A power plant exhaust emission detection system according to claim 1, characterized in that: A rotating ring (57) corresponding to the pin block (55) is rotatably provided at the lower end of the filter disc (51).

4. A power plant exhaust emission detection system according to claim 2, characterized in that: The transmission shaft (52) is provided with a collection frame (6) rotatably connected to the support tube (1), a rotating screw (61) is rotatably passed through the collection frame (6), and a spiral blade (611) located in the collection frame (6) is provided on the rotating screw (61).

5. A power plant exhaust emission detection system according to claim 4, characterized in that: The collection frame (6) is provided with a scraper (66).

6. A power plant exhaust emission detection system according to claim 4, characterized in that: A driving gear (62) is disposed at one end of the rotating screw rod (61), and a gear ring (63) meshing with the driving gear (62) is disposed inside the supporting cylinder (1).

7. A power plant exhaust emission detection system according to claim 4, characterized in that: A discharge hole (64) is provided on one side of the collection frame (6), and a conveying hole (65) communicating with the discharge hole (64) is provided on the transmission shaft (52).

8. A power plant exhaust emission detection system according to claim 1, characterized in that: A condensation collector (7) is arranged in the sliding cylinder (4); The condensation collector (7) comprises a partition plate (71) arranged in the sliding cylinder (4), a condensation plate (72) located below the partition plate (71) is arranged in the sliding cylinder (4), and a condensation chamber (73) is formed between the condensation plate (72) and the partition plate (71); The sliding cylinder (4) is provided with a heat insulation plate (74) located below the condensation plate (72), and a cooling chamber (75) is formed between the heat insulation plate (74) and the condensation plate (72).

9. A power plant exhaust emission detection system according to claim 8, characterized in that: A connecting pipe (76) is provided between the condensation plate (72) and the heat insulation plate (74), and a bending section (77) communicating with the condensation chamber (73) is provided at the upper end of the connecting pipe (76).

10. A method for detecting exhaust gas emissions from a power plant, using a system for detecting exhaust gas emissions from a power plant as claimed in any one of claims 1 to 9, characterized in that: The method of use includes the following steps: S1: exhaust gas inhalation. When detecting the exhaust gas of a power plant, the driving shaft (3) is first rotated, and the rotating driving shaft (3) drives the sliding cylinder (4) to move up and down in the supporting cylinder (1); S2: Exhaust gas discharge. When the sliding cylinder (4) moves upward, the exhaust gas is sucked into the lower part of the sliding cylinder (4) in the supporting cylinder (1) through the air inlet pipe (2). The one-way valve prevents the exhaust gas from flowing back. Therefore, the gas passes through the check valve (41) from the sliding cylinder and enters the upper part of the sliding cylinder (4), and then is discharged from the gas outlet (11) opened at the upper end of the supporting cylinder (1); S3: Filtration sampling. When the sliding cylinder (4) moves downward, the exhaust gas entering the supporting cylinder (1) first passes through the filter disc (51). The filter disc (51) intercepts and collects the particulate matter in the exhaust gas, while the gas passes through the filter disc (51) into the sliding cylinder (4), and then passes through the check valve (41) and is discharged from the gas outlet (11).

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