A power plant exhaust emission detection system and method

Abstract

The application relates to the technical field of waste gas detection, in particular to a power plant waste gas emission detection system and method, which comprises a supporting cylinder, the bottom of the supporting cylinder is provided with an air inlet pipe, the upper end of the supporting cylinder is provided with an air outlet, a driving shaft is rotatably arranged in the supporting cylinder, a sliding cylinder is slidably arranged in the supporting cylinder and is threadedly connected with the driving shaft, a sampling detector is arranged in the sliding cylinder, the filter disc intercepts and collects particulate matters in waste gas, the gas passes through the filter disc and enters the sliding cylinder, the collecting frame is rotatably arranged in the supporting cylinder in a rotationally connected mode, the scraping plate arranged on the collecting frame can scrape off the intercepted particulate matters on the filter disc, and the particulate matters fall into the collecting frame. The moving stroke of the sliding cylinder is the same each time, which means that the amount of waste gas sucked into the supporting cylinder is relatively the same each time, the design ensures that the amount of waste gas for sampling and detection is consistent each time, and the stability and reliability of the detection result are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas detection, in particular to a power plant waste gas emission detection system and method. BACKGROUND

[0002] As a major energy supply facility, the impact of the waste gas emitted by power plants on the atmospheric environment and human health is increasingly concerned. Power plants, especially coal-fired and oil-fired power plants, produce a large amount of pollutants in the production process, which not only cause environmental problems such as acid rain and photochemical smog, but also cause health problems such as respiratory system diseases and cardiovascular diseases.

[0003] Power plant waste gas emission detection is an important means to protect environmental quality and public health. Through advanced online monitoring technology, analysis technology and data management technology, power plants can monitor the pollutant concentration in waste gas in real time and continuously, to ensure that the emission meets environmental protection standards. For example, the waste gas emission compliance detection device with publication number CN110940775B relates to the technical field of waste gas emission, which includes a shell, a side cover fixed on the outside of the shell by bolts, a sensor mounting hole for providing the detection device with the function of installing sensors, and devices that can be flexibly selected and used according to different waste gas components for real-time detection. Real-time detection can ensure the uniformity of sampling, and the detection device is provided with branches that can be closed when not in use, and an acceleration device is arranged in the main pipeline to assist the movement of waste gas for detection.

[0004] However, the above-mentioned prior art still has some defects when detecting the waste gas of power plants.

[0005] The above-mentioned prior art can intercept and adsorb the substances in the waste gas by setting a filter screen, and then the sampling pipe can be connected to the water pipe to flush the filter screen for sampling. However, due to the continuous accumulation of particulate matter on the filter screen, the total amount of waste gas passing through the filter screen and the concentration of particulate matter will change over time, which results in that 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 result only suitable for qualitative analysis (such as judging whether harmful substances exist), but cannot be used for accurate quantitative analysis (such as determining the concentration of harmful substances), so that the sampling result lacks the basis for quantitative analysis.

[0006] At the same time, the waste gas may also contain various gaseous harmful substances, and the filter screen cannot collect these gaseous harmful substances. This limitation not only affects the accuracy and reliability of the detection result, but also limits the efficiency and applicability of the device in actual application.

[0007] Therefore, based on the above-mentioned points, the existing technology for detecting the waste gas of power plants still has room for improvement. SUMMARY

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

[0009] In a first aspect, a power plant waste gas emission detection system includes a support cylinder, the bottom of the support cylinder is provided with an air inlet pipe, the upper end of the support cylinder is provided with an air outlet, a drive shaft is rotatably arranged in the support cylinder, a sliding cylinder is slidably arranged in the support cylinder and is threadedly connected with the drive shaft, a non-return valve is arranged at the upper end of the sliding cylinder, and a sampling detector is arranged in the sliding cylinder.

[0010] The sampling detector includes a filter disc arranged at the lower end of the sliding cylinder, the filter disc is slidably connected with the drive shaft, a transmission shaft is rotatably arranged at the lower end of the drive shaft, and the lower end of the transmission shaft penetrates the support cylinder.

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

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

[0013] Preferably, a collection frame is arranged on the transmission shaft and is rotatably connected with the support cylinder, a rotating lead screw is rotatably arranged in the collection frame, and a spiral blade located in the collection frame is arranged on the rotating lead screw.

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

[0015] Preferably, a drive gear is arranged at one end of the rotating lead screw, and a gear ring meshing with the drive gear is arranged on the inner side of the support cylinder.

[0016] Preferably, a discharge hole is arranged on one side of the collection frame, and a conveying hole communicating with the discharge hole is arranged on the transmission shaft.

[0017] Preferably, a condensation collector is arranged in the sliding cylinder.

[0018] The condensation collector includes 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 cavity is formed between the condensation plate and the partition plate.

[0019] A heat insulation plate located below the condensation plate is arranged in the sliding cylinder, and a cooling cavity 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 insulation plate, and a bending section is arranged at the upper end of the connecting pipe and communicates with the condensing cavity.

[0021] In a second aspect, a method for detecting exhaust gas of a power plant comprises the following steps:

[0022] S1: exhaust gas suction, when detecting the exhaust gas of the power plant, first drive the driving shaft to rotate, 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 supporting cylinder through the air inlet pipe, and the one-way valve prevents the exhaust gas from flowing back, so the gas passes through the check valve from the sliding cylinder, enters the upper part of the sliding cylinder, and is discharged from the gas outlet arranged at the upper end of the supporting cylinder;

[0024] S3: filtering and sampling, when the sliding cylinder moves downward, the exhaust gas entering the supporting cylinder first passes through the filter disc, the filter disc intercepts and collects the particulate matters in the exhaust gas, and the gas passes through the filter disc into the sliding cylinder and then is discharged from the gas outlet through the check valve.

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

[0026] 1. The filter disc of the present application intercepts and collects the particulate matters in the exhaust gas, and the gas passes through the filter disc into the sliding cylinder, the collecting frame rotates in the supporting cylinder through the rotating connection with the supporting cylinder, and the scraper arranged on the collecting frame scrapes the intercepted particulate matters on the filter disc, so that the particulate matters fall into the collecting frame. The moving stroke of the sliding cylinder is the same each time, which means that the amount of exhaust gas sucked into the supporting cylinder is relatively the same each time. This design ensures that the amount of exhaust gas for sampling and detection is consistent each time, and improves the stability and reliability of the detection result.

[0027] 2. The exhaust gas filtered by the filter plate contacts the condensing plate, and the moisture in the exhaust gas condenses and is drained. Since the drainage hole arranged on the upper side of the condensing plate is inclined, the moisture passes through the drainage hole into the communication pipe connected to the supporting cylinder, and the communication pipe is connected to the detection equipment. The moisture is detected and sampled by the detection equipment. Since the moving stroke of the sliding cylinder is fixed, the amount of exhaust gas sucked each time is consistent, and the amount of particulate matters intercepted by the filter disc is proportional to the content of particulate matters in the exhaust gas. The collected particulate matters are quantitatively analyzed through the conveying hole connected to the existing detection equipment, and the content of particulate matters in the exhaust gas is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic view of the present application.

[0029] Figure 2 is a structural schematic view of the supporting cylinder of the present application.

[0030] Figure 3 is the structural diagram of the sampling detector of the present application.

[0031] Figure 4 is the sectional view of the sliding cylinder and the sampling detector of the present application

[0032] Figure 5 is the structural diagram of the sampling detector of the present application.

[0033] Figure 6 is the structural diagram of the sampling detector of the present application Figure 5 is the partial enlarged view at A in the present application.

[0034] Figure 7 is the structural diagram of the sampling detector of the present application Figure 5 is the partial enlarged view at B in the present application.

[0035] Figure 8 is the structural diagram of the sampling detector of the present application is the structural diagram of the sampling detector of the present application

[0036] is the partial enlarged view at C in the present application. Figure 9 Figure 8 is the structural diagram of the sampling detector of the present application

[0037] Figure 10 is the structural diagram of the sampling detector of the present application

[0038] Figure 11 is the sectional view of the condensing collector of the present application.

[0039] Figure 12 is the structural diagram of the sampling detector of the present application

[0040] Figure 13 is the sectional view of the condensing collector of the present application.

[0041] Figure 14 Figure 13 is the sectional view of the condensing collector of the present application.

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

[0043] The following will be described in detail with reference to the accompanying drawings. Figures 1 to 14 The present application will be further described in detail.

[0044] The embodiments of the present application disclose a power plant waste gas emission detection system and method, which realizes quantitative detection by intercepting and sampling particulate matters in waste gas through inhaling a certain amount of waste gas each time, and then condensing the waste gas to condense water in the waste gas.

[0045] Embodiment I:

[0046] Referring to Figs. 1-8, Figure 1 Figure 2 and Figure 3 , a power plant waste gas emission detection system includes a support cylinder 1, a drive shaft 3 is rotatably arranged in the support cylinder 1, and a sliding cylinder 4 is slidably arranged in the support cylinder 1 and threadedly connected with the drive shaft 3.

[0047] When detecting the waste gas of the power plant, the air inlet pipe 2 arranged at the bottom of the support cylinder 1 is connected to the chimney for emission, and then the existing driving technology is used to drive the drive shaft 3 to rotate, and the rotating drive shaft 3 drives the sliding cylinder 4 to move up and down in the support cylinder 1 through thread 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 closes the sliding cylinder 4, so that a negative pressure is formed in the support cylinder 1, the waste gas emitted by the power plant is sucked into the lower part of the sliding cylinder 4 in the support cylinder 1 through the air inlet pipe 2, and a one-way valve (not shown in the figure) is arranged in the air inlet pipe, when the sliding cylinder 4 moves downward, the check valve 41 is opened, and the one-way valve prevents the waste gas from flowing back, so the gas passes through the check valve 41 in the sliding cylinder 4, enters the upper part of the sliding cylinder 4, and is discharged from the air outlet 11 arranged at the upper end of the support cylinder 1.

[0049] ​In the process of the exhaust gas passing through the sliding cylinder 4, the sampling detector 5 arranged in the sliding cylinder 4 can collect the particulate matters in the exhaust gas and perform sampling detection on the collected particulate matters.

[0050] Referring to Figure 4 , Figure 4 and Figure 5 , 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 in sliding connection with the driving shaft 3, the lower end of the driving shaft 3 is rotationally arranged with a transmission shaft 52, the lower end of the transmission shaft 52 rotationally penetrates the support cylinder 1, and the transmission shaft 52 is connected with the bottom of the support cylinder 1 through a volute spring (not shown in the figure).

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

[0052] Referring to Figure 5 , Figure 6 and Figure 7 , wherein the sampling detector 5 includes a transmission sliding groove 53 opened on the transmission shaft 52, the driving shaft 3 is opened with a driving sliding groove 54 corresponding to the transmission sliding groove 53, the transmission sliding groove 53 is slidably arranged with a pin block 55 corresponding to the driving sliding groove 54, and the lower end of the pin block 55 is arranged with a reset spring 56 between the transmission sliding groove 53.

[0053] The reset spring 56 abuts against the pin block 55, so that the pin block 55 is always pinned into the driving sliding groove 54, and 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] In the process of the filter disc 51 moving downward with the sliding cylinder 4, the filter disc 51 drives the rotation ring 57 corresponding to the pin block 55 arranged at the lower end of the filter disc 51 to move together, when the sliding cylinder 4 moves to the lower side of the support cylinder 1, the driving shaft 3 stops rotating, at this time, when the rotation ring 57 abuts against the pin block 55, the rotation ring 57 will push the pin block 55 to move to the pin to make the pin block 55 exit the driving sliding groove 54.

[0055] Subsequently, the tightened volute spring will diverge, the diverging volute spring will drive the transmission shaft 52 to rotate, the transmission shaft 52 will drive the collection frame 6 arranged thereon to rotate in the support cylinder 1 through the rotation connection with the support cylinder 1, and the scraper 66 arranged on the collection frame 6 will scrape the intercepted particulate matters on the filter disc 51, so that the particulate matters fall into the collection frame 6.

[0056] At the same time, the rotating lead screw 61 rotatingly arranged in the collecting frame 6 rotates together with the collecting frame 6, and the rotating lead screw 61 drives the driving gear 62 arranged at one end to rotate, and the driving gear 62 drives the rotating lead screw 61 to rotate through the gear ring 63 arranged on the inner side of the supporting cylinder 1 and engaged with the driving gear 62, so that the rotating lead screw 61 drives the spiral blade 611 arranged thereon to rotate, and the spiral blade 611 is arranged in the collecting frame 6 to convey the particulate matter falling into the collecting frame 6 to the discharge hole 64 arranged on one side of the collecting frame 6.

[0057] Referring to Figure 8 and Figure 9 , the transmission shaft 52 is provided with the conveying hole 65 connected with the discharge hole 64, and the particulate matter passing through the discharge hole 64 enters the conveying hole 65, and the conveying hole 65 is connected with the existing detection equipment to detect the collected particulate matter.

[0058] When the sliding cylinder 4 moves upward, the rotating ring 57 is separated from the pin block 55, and the compressed reset spring 56 pushes the pin block 55 into the driving sliding groove 54, so that the transmission shaft 52 rotates together with the driving shaft 3 to make the volute spring tight again.

[0059] The moving 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 is relatively the same each time. This design ensures that the amount of exhaust gas for sampling and detection is consistent each time, thereby improving the stability and reliability of the detection result.

[0060] Since the moving stroke of the sliding cylinder 4 is fixed and the amount of exhaust gas sucked each time is consistent, the amount of particulate matter intercepted by the filter disc 51 is proportional to the content of particulate matter in the exhaust gas. The conveying hole 65 is connected with the existing detection equipment to quantitatively analyze the collected particulate matter and obtain the content of particulate matter in the exhaust gas.

[0061] Example Two

[0062] Referring to Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 , on the basis of example one, the sliding cylinder 4 is provided with a condensation collector 7, which processes the filtered exhaust gas and collects the moisture in the exhaust gas for sampling and detection.

[0063] Specifically, the condensation collector 7 comprises a partition plate 71 arranged in the sliding cylinder 4, a condensation plate 72 arranged below the partition plate 71 in the sliding cylinder 4, a condensation cavity 73 formed between the partition plate 71 and the condensation plate 72, a heat insulation plate 74 arranged below the condensation plate 72 in the sliding cylinder 4, and a connecting pipe 76 penetrating through the partition plate 71, the condensation plate 72 and the heat insulation plate 74, wherein the upper end of the connecting pipe 76 is provided with a bent section 77 communicated with the condensation cavity 73.

[0064] The heat insulation plate 74 and the condensing plate 72 form a cooling cavity 75, and the cooling cavity 75 is filled with cooling liquid, which cools the condensing plate 72 and keeps the condensing plate 72 in a low temperature state.

[0065] When the sliding cylinder 4 moves downward, the exhaust gas passes through the filter plate to intercept the particulate matters in the exhaust gas, enters the connecting pipe 76, passes through the bending section 77 to enter the condensing cavity 73, is discharged from the exhaust holes 78 formed in the partition plate 71, and is discharged from the exhaust port 11 after passing through the check valve 41.

[0066] In this process, the exhaust gas filtered by the filter plate contacts the condensing plate 72, and the moisture in the exhaust gas condenses into water. Since the drainage hole 87 is inclined to one side of the sliding cylinder 4, the water is gathered to the drainage hole 87.

[0067] When the sliding cylinder 4 moves to the lower side of the support cylinder 1, the communication pipe 88 connected to the support cylinder 1 communicates with the drainage hole 87. At this time, the water enters the communication pipe 88 connected to the drainage hole 87 of the support cylinder 1, and the communication pipe 88 is connected to the existing detection equipment. The water is detected and sampled by the detection equipment.

[0068] The upper end of the support cylinder 1 is provided with a water storage tank 8, the water storage tank 8 is filled with cooling liquid, a sliding plate 81 is slidably arranged in the water storage tank 8, the sliding plate 81 divides the water storage tank 8 into an upper cavity 82 and a lower cavity 83, a connecting rod 84 is arranged on the sliding plate 81, the lower end of the connecting rod 84 penetrates into the cooling cavity 75 and is connected to the condensing plate 72, a water inlet hole 85 connecting the cooling cavity 75 and the upper cavity 82 is formed in the connecting rod 84, and a water outlet hole 86 connecting the cooling cavity 75 and the lower cavity 83 is formed in the connecting rod 84.

[0069] During the repeated movement of the sliding cylinder 4, the connecting rod 84 moves together, and the connecting rod 84 drives the sliding plate to move together. When the sliding plate 81 moves upward, the space of the upper cavity 82 is compressed and the space of the lower cavity 83 is expanded. At this time, the cooling liquid in the upper cavity 82 enters the cooling cavity 75 through the water inlet hole 85, and the cooling liquid in the cooling cavity 75 enters the lower cavity 83 through the water outlet hole 86. Conversely, when the sliding plate 81 moves downward, the space of the lower cavity 83 is compressed and the space of the upper cavity 82 is expanded. At this time, the cooling liquid in the lower cavity 83 enters the cooling cavity 75 through the water outlet hole 86, and the cooling liquid in the cooling cavity 75 enters the upper cavity 82 through the water inlet hole 85, thereby circulating.

[0070] In the process of circulation, the cooling liquid in the water storage tank 8 is cooled by the cooling device to ensure that the cooling liquid in the cooling cavity 75 is always in a low temperature state to cool the condensing plate 72.

[0071] Finally, the application also provides a power plant waste gas emission detection method, the use method comprising the following steps:

[0072] S1: waste gas suction, when detecting the waste gas of the power plant, first drive the driving shaft 3 to rotate, and the rotating driving shaft 3 drives the sliding cylinder 4 to move up and down in the support cylinder 1.

[0073] S2: exhaust gas discharge, when the sliding cylinder 4 moves upward, the exhaust gas is sucked into the lower side of the sliding cylinder 4 in the support cylinder 1 through the air inlet pipe 2, and the one-way valve prevents backflow of the exhaust gas, so the gas passes through the non-return valve 41 from the sliding cylinder to the upper side of the sliding cylinder 4, and is discharged from the gas outlet 11 opened at the upper end of the support cylinder 1.

[0074] S3: filtering and sampling, when the sliding cylinder 4 moves downward, the exhaust gas entering the support cylinder 1 first passes through the filter disc 51, the filter disc 51 intercepts and collects particulate matters in the exhaust gas, and the gas passes through the filter disc 51 into the sliding cylinder 4, and then passes through the non-return valve 41 to be discharged from the gas outlet 11.

[0075] S4: coaxial linkage, the driving shaft 3 drives the transmission shaft 52 to rotate together through the pin block 55, the rotating transmission shaft 52 drives the spiral spring to tighten, when the sliding cylinder 4 moves to the lower side of the support cylinder 1, the driving shaft 3 stops rotating, at this time, when the rotating ring 57 abuts against the pin block 55, the rotating ring 57 pushes the pin block 55 to move to the pin, so that the pin block 55 exits the driving sliding groove 54.

[0076] S5: condensation sampling, then the tightened spiral spring expands, the expanding spiral spring drives the transmission shaft 52 to rotate, the transmission shaft 52 drives the collection frame 6 arranged thereon to rotate in the support cylinder 1, the scraper 66 arranged on the collection frame 6 scrapes the intercepted particulate matters on the filter disc 51, so that the particulate matters fall into the collection frame 6.

[0077] S6: synchronous sampling, the filtered exhaust gas contacts the condensing plate 72, and the moisture in the exhaust gas condenses into water, and because the condensing plate 72 is inclined to the water outlet hole 87 on the upper side of the sliding cylinder 4, the water gathers to the water outlet hole 87.

[0078] When the sliding cylinder 4 moves to the lower part of the supporting cylinder 1, the communicating pipes 88 connected to the supporting cylinder 1 are communicated with each other through the corresponding drain holes 87, at this time, the moisture can pass through the drain holes 87 into the communicating pipes 88 connected to the supporting cylinder 1 and corresponding to the drain holes 87, the communicating pipes 88 are connected with the existing detection equipment, and the moisture can be detected by the detection equipment.

[0079] The embodiments of the present application are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A power plant exhaust gas emission detection system, comprising a support cylinder (1), an air inlet pipe (2) at the bottom of the support cylinder (1), and an air outlet (11) at the upper end of the support cylinder (1), characterized in that: A drive shaft (3) is rotatably inserted inside the support cylinder (1), and a sliding cylinder (4) threadedly connected to the drive shaft (3) is slidably installed inside the support cylinder (1). A check valve (41) is installed at the upper end of the sliding cylinder (4), and a sampling detector (5) is installed inside the sliding cylinder (4). The sampling detector (5) includes a filter plate (51) provided at the lower end of the sliding cylinder (4). The filter plate (51) is slidably connected to the drive shaft (3). The lower end of the drive shaft (3) is rotatably provided with a transmission shaft (52). The lower end of the transmission shaft (52) rotatably passes through the support cylinder (1). The drive shaft (52) is connected to the bottom of the support cylinder (1) by a spiral spring; The sampling detector (5) includes a transmission groove (53) on the transmission shaft (52), a drive groove (54) corresponding to the transmission groove (53) on the drive shaft (3), a pin (55) corresponding to the drive groove (54) is slidably arranged in the transmission groove (53), and a return spring (56) is arranged between the lower end of the pin (55) and the transmission groove (53). The lower end of the filter disc (51) is rotatably equipped with a rotating ring (57) corresponding to the pin block (55); A collection frame (6) is provided on the drive shaft (52) and rotatably connected to the support cylinder (1). A rotating screw (61) is rotatably passed through the collection frame (6). A spiral blade (611) located inside the collection frame (6) is provided on the rotating screw (61). A scraper (66) is provided on the collection frame (6); A drive gear (62) is provided at one end of the rotating screw (61), and a gear ring (63) that meshes with the drive gear (62) is provided on the inner side of the support cylinder (1); 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 drive shaft (52).

2. A power plant exhaust gas emission detection system according to claim 1, characterized in that: A condensation collector (7) is provided inside the sliding cylinder (4); the condensation collector (7) includes a partition plate (71) provided inside the sliding cylinder (4), a condensation plate (72) located below the partition plate (71) is provided inside the sliding cylinder (4), and a condensation cavity (73) is formed between the condensation plate (72) and the partition plate (71); a heat insulation plate (74) located below the condensation plate (72) is provided inside the sliding cylinder (4), and a cooling cavity (75) is formed between the heat insulation plate (74) and the condensation plate (72); A connecting pipe (76) is provided between the partition plate (71), the condenser plate (72) and the heat insulation plate (74), and the upper end of the connecting pipe (76) is provided with a bent section (77) that communicates with the condenser cavity (73).

3. A method for detecting exhaust gas emissions from power plants, employing a power plant exhaust gas emission detection system as described in any one of claims 1-2, characterized in that, Its usage includes the following steps: S1: Exhaust gas intake. When detecting the exhaust gas of the power plant, the drive shaft (3) is first rotated. The rotating drive shaft (3) drives the sliding cylinder (4) to move up and down in the support cylinder (1). S2: Exhaust gas is discharged. When the sliding cylinder (4) moves upward, the exhaust gas is drawn into the support cylinder (1) below the sliding cylinder (4) through the air inlet pipe (2). The one-way valve prevents the exhaust gas from flowing back, so the gas passes through the check valve (41) from inside the sliding cylinder and enters the upper part of the sliding cylinder (4), and is discharged from the outlet (11) opened at the upper end of the support cylinder (1). S3: Filter sampling. When the sliding cylinder (4) moves downward, the exhaust gas entering the support cylinder (1) first passes through the filter plate (51). The filter plate (51) intercepts and collects the particulate matter in the exhaust gas, while the gas passes through the filter plate (51) into the sliding cylinder (4), and then passes through the check valve (41) and is discharged from the outlet (11).

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