Flue gas denitration nitrogen oxide measuring device

Abstract

The utility model discloses a flue gas denitration nitrogen oxide measuring device, which comprises a measuring device body, a sampling tube and a sampling assembly, a measuring head is arranged above the measuring device body, the measuring head is arranged on the sampling assembly, the sampling assembly moves upwards relative to the sampling tube to drive the measuring head to move upwards relative to the sampling tube, the measuring head enters the sampling tube, and the sampling tube is connected with the sampling assembly. The sampling assembly is tightly attached to the lower edge of the sampling pipe, the sampling assembly and the sampling pipe are closed to form a closed cavity, and the measuring head is located in the closed cavity. According to the utility model, the sampling assembly and the sampling tube are closed to form the closed chamber to block external flowing flue gas, so that the impact of turbulence and pressure fluctuation on the sensor of the measuring head is avoided, the NOx concentration measurement error is reduced, the gas in the closed chamber can reach pressure balance after standing for one second, and the stable working condition of the spectrum or electrochemical sensor is ensured; and signal drift is reduced.

Description

Technical Field

[0001] This utility model relates to a flue gas denitrification nitrogen oxide measuring device. Background Technology

[0002] Flue gas denitrification of nitrogen oxides (NOx) x The measuring device is a device used to monitor the concentration of nitrogen oxides (NO, NO2, etc.) in industrial flue gas. It is mainly used in coal-fired power plants, chemical plants, steel plants, and other plants that require denitrification (NO2 removal). x In the field of emission reduction, its core function is to detect NO in flue gas in real time. x The content provides data feedback for denitrification systems (such as SCR and SNCR) to ensure that denitrification efficiency meets standards and environmental emission standards.

[0003] A SCR denitrification device disclosed in Chinese Utility Model Patent Application Publication CN114950124A includes an SCR reactor, an inlet flue, and an outlet flue. The inlet flue is located on one side of the SCR reactor and connected to the top inlet of the SCR reactor via an inlet elbow. The outlet flue is connected to the bottom outlet of the SCR reactor. Both the SCR reactor and the inlet flue are supported by a steel frame. The inlet flue is arranged vertically and has a vertically downward flue gas inlet with an inlet expansion joint arranged vertically inside. The outlet flue is also arranged vertically and has a vertically downward flue gas outlet with an outlet expansion joint arranged vertically inside. The projections of the inlet and outlet flues onto the horizontal plane are both located inside the projection of the outer contour of the steel frame onto the horizontal plane. During operation, the pipe force caused by the negative pressure of the expansion joint is vertically downward and the force application point is located within the outer contour of the steel frame, without generating horizontal pipe force and bending moment, thus improving the structural strength and stability of the supporting steel frame.

[0004] The above-mentioned utility model has the following disadvantages:

[0005] 1. Flue gas continuously flows through the measurement chamber at an unsteady velocity, causing sensor signal drift due to gas turbulence and pressure fluctuations, especially under variable operating conditions at the outlet of the SCR denitrification system. x The error increases significantly when the concentration changes transiently, resulting in a large deviation in the measurement results.

[0006] 2. The sampling probe has difficulty removing sticky particles (such as ammonium bisulfate crystals), and the residual contamination will interfere with subsequent detection.

[0007] In order to solve the above problems, this utility model is hereby proposed. Utility Model Content

[0008] The purpose of this invention is to provide a flue gas denitrification nitrogen oxide measuring device.

[0009] The objective of this utility model can be achieved through the following technical solutions:

[0010] A flue gas denitrification nitrogen oxide measuring device includes a measuring device body, a sampling tube, and a sampling assembly. A measuring head is provided above the measuring device body and is mounted on the sampling assembly. The sampling assembly moves upward relative to the sampling tube, causing the measuring head to move upward relative to the sampling tube. The measuring head enters the sampling tube. The sampling assembly is close to the lower edge of the sampling tube. After the sampling assembly and the sampling tube are closed, a closed chamber is formed, and the measuring head is located in the closed chamber.

[0011] Furthermore, the sampling assembly includes a measuring head mounting plate, with a hole-like structure in the middle of the measuring head mounting plate, and the measuring head is installed inside the hole-like structure.

[0012] Preferably, a sealing ring is provided above the measuring head mounting plate, and an annular groove is provided on the upper side of the sealing ring; a plug ring is connected to the bottom end of the sampling tube; the plug ring of the sampling assembly is inserted into the interior of the annular groove.

[0013] Furthermore, an outer cylinder is rotatably connected above the measuring head mounting plate. An internally threaded rod is provided inside the outer cylinder. The upper part of the internally threaded rod is connected to the sampling tube. The rotation of the outer cylinder drives the internally threaded rod to move downwards, thereby driving the sampling tube to move closer to the measuring device body.

[0014] Preferably, the sampling tube is further provided with a cleaning component; the cleaning component includes a fixing ring; a circular hole is provided at the top of the sampling tube, the circular hole is provided with an internal thread, the fixing ring is provided with an external thread, a threaded adjusting rod is provided in the middle of the fixing ring, a connecting rod is provided on the side of the threaded adjusting rod, a sliding rod is provided below the connecting rod, an insertion hole is provided on the upper surface of the fixing ring, the sliding rod is inserted into the insertion hole, and a cleaning cotton tube is provided below the fixing ring.

[0015] Furthermore, a connecting sleeve is provided below the fixing ring, an inner cavity is provided on the lower surface of the connecting sleeve, a slot is provided on the side of the inner cavity, an insert is provided on the side of the cleaning cotton tube, the upper part of the cleaning cotton tube is placed in the inner cavity of the connecting sleeve, and the insert is snapped into the slot to form a stable connection between the cleaning cotton tube and the connecting sleeve.

[0016] Preferably, the bottom end of the cleaning cotton tube is provided with a groove, which matches the shape of the measuring head.

[0017] Beneficial technical effects:

[0018] 1. This utility model, by setting up a sampling component and sampling tube to form a closed chamber after closure, blocks external flowing flue gas, avoiding the impact of turbulence and pressure fluctuations on the sensor of the measuring head, thus preventing NO... x Concentration measurement error is reduced, and the gas in the sealed chamber can reach pressure equilibrium after standing still for a few seconds, ensuring stable working conditions for spectral or electrochemical sensors and reducing signal drift.

[0019] 2. This utility model uses a threaded adjusting rod to drive a cleaning cotton tube to perform full-wrap friction cleaning of the outer wall of the measuring head, removing residual dust, sulfate crystals, and other contaminants, avoiding "memory effect" interference, and ensuring NO... x The concentration measurement error is reduced because the bottom of the cleaning cotton tube is equipped with a groove that perfectly matches the shape of the measuring head, reducing cleaning dead spots. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of the flue gas denitrification nitrogen oxide measuring device of this utility model.

[0022] Figure 2 This is a schematic diagram of the sampling tube, sampling component, and cleaning component of this utility model.

[0023] Figure 3 This is an exploded view of the sampling tube, sampling components, and some cleaning components of this utility model.

[0024] Figure 4 This is an exploded view of the cleaning component of this utility model.

[0025] The markings in the diagram are: 1. Measuring device body; 2. Sampling tube; 3. Round hole; 4. Measuring head mounting plate; 5. Sampling assembly; 6. Cleaning assembly; 61. Fixing ring; 62. Connecting rod; 63. Threaded adjusting rod; 64. Slide rod; 65. Connecting sleeve; 66. Slot; 67. Cleaning cotton tube; 68. Insert; 7. Measuring head. Detailed Implementation

[0026] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0027] like Figure 1-4As shown, a flue gas denitrification nitrogen oxide measuring device includes a measuring device body 1, a sampling tube 2, and a sampling assembly 5. A measuring head 7 is disposed on the top of the measuring device body 1. The measuring device body 1 measures the concentration of denitrification nitrogen oxides in the flue gas through the measuring head 7. The measuring head 7 is mounted on the sampling assembly 5. The upward movement of the sampling assembly 5 relative to the sampling tube 2 causes the measuring head 7 to move upward relative to the sampling tube 2, and the measuring head 7 enters the sampling tube 2. The sampling assembly 5 is close to the lower edge of the sampling tube 2. After the sampling assembly 5 and the sampling tube 2 are closed, a closed chamber is formed. The measuring head 7 is located in the closed chamber. The closed chamber blocks the external flow of flue gas, avoiding the impact of turbulence and pressure fluctuations on the sensor of the measuring head 7, so that the NO... x The concentration measurement error is reduced. The gas in the sealed chamber can reach pressure balance after standing still for a few seconds, ensuring stable working conditions for the spectral or electrochemical sensor and reducing signal drift. The sealed chamber can also prevent particulate matter from entering the measuring head 7, reducing contamination of the measuring head 7 and extending the filter replacement cycle.

[0028] The sampling assembly 5 includes a measuring head mounting plate 4, which has a hole-like structure in the middle, and the measuring head 7 is installed in the hole-like structure.

[0029] A sealing ring 51 is provided above the measuring head mounting plate 4, and an annular groove 52 is provided on the upper side of the sealing ring 51. A plug ring 55 is connected to the bottom end of the sampling tube 2; the plug ring 55 of the sampling assembly 5 is inserted into the interior of the annular groove 52.

[0030] An outer cylinder 53 is rotatably connected to the top of the measuring head mounting plate 4. An internal threaded rod 54 is provided inside the outer cylinder 53. The upper part of the internal threaded rod 54 is connected to the sampling tube 2. The rotation of the outer cylinder 53 drives the internal threaded rod 54 to move downwards from the outer cylinder 53, which in turn drives the sampling tube 2 to move closer to the measuring device body 1. Finally, the insertion ring 55 connected to the bottom end of the sampling tube 2 will be inserted into the interior of the annular groove 52.

[0031] The sampling tube 2 is also equipped with a cleaning component 6. The cleaning component 6 includes a retaining ring 61.

[0032] A circular hole 3 is provided above the sampling tube 2, and the circular hole 3 is provided with an internal thread. The fixing ring 61 is provided with an external thread. A threaded adjusting rod 63 is provided in the middle of the fixing ring 61. A connecting rod 62 is provided on the side of the threaded adjusting rod 63. A sliding rod 64 is provided below the connecting rod 62. An insertion hole is provided on the upper surface of the fixing ring 61. The sliding rod 64 is inserted into the insertion hole. Thus, when the threaded adjusting rod 63 rotates, it drives the fixing ring 61 to rotate. The fixing ring 61 rotates along the internal thread of the circular hole 3. A cleaning cotton tube 67 is provided below the fixing ring 61.

[0033] A connecting sleeve 65 is provided below the fixing ring 61. The lower surface of the connecting sleeve 65 is provided with an inner cavity. The side of the inner cavity is provided with a slot 66. The side of the cleaning cotton tube 67 is provided with an insert 68. The upper part of the cleaning cotton tube 67 is placed in the inner cavity of the connecting sleeve 65. The insert 68 is snapped into the slot 66 to form a stable connection between the cleaning cotton tube 67 and the connecting sleeve 65.

[0034] The circular hole 3, the threaded adjusting rod 63, and the outer cylinder 53 are all controlled by an external controller. During measurement, the external controller drives the outer cylinder 53 to rotate. The outer cylinder 53 rotates clockwise, causing the internal threaded rod 54 to move downwards from the outer cylinder 53, which in turn moves the sampling tube 2 closer to the measuring device body 1. Finally, the insertion ring 55 connected to the bottom of the sampling tube 2 is inserted into the annular groove 52, creating a closed space at the top of the measuring head 7. During the movement, the inside of the sampling tube 2 is filled with flue gas. After the sampling tube 2 is closed to the top of the measuring head 7 by the sampling assembly 5, the external controller controls the measuring head 7 and the measuring device body 1 to measure the denitrified ammonia oxides in the flue gas. This method of measuring the denitrified ammonia oxides in the flue gas avoids the influence of flowing flue gas on the measurement results. After the measurement, the external controller controls the outer cylinder 53 to rotate counterclockwise, pushing the internal threaded rod 54 to move the sampling tube 2 away from the measuring device body 1, allowing the flue gas to flow back into the sampling tube 2.

[0035] The external controller refers to the advanced control center host, the automated control center. The utility model allows the operation of the control device directly through the control center in the embodiment. The threaded adjusting rod 63 rotates and moves downward. The threaded adjusting rod 63 rotates spirally while the outer shell remains stationary. The threaded adjusting rod 63 drives the fixed ring 61 to move up and down inside the round hole 3. At the same time, the threaded adjusting rod 63 can be connected to an external groove. The groove is provided with an internal spiral pattern. The outer surface of the threaded adjusting rod 63 is provided with a spiral pattern. The threaded adjusting rod 63 moves up and down inside the groove.

[0036] This invention uses a threaded adjusting rod 63 to drive a cleaning cotton tube 67 to perform full-wrap friction cleaning of the outer wall of the measuring head 7, removing residual dust, sulfate crystals, and other contaminants, avoiding "memory effect" interference, and ensuring NO... x The concentration measurement error is reduced because the bottom of the cleaning cotton tube 67 is provided with a groove that perfectly matches the shape of the measuring head 7, thus reducing cleaning dead angles.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flue gas denitration nitrogen oxide measuring device characterized by comprising: The device includes a measuring device body, a sampling tube, and a sampling assembly. A measuring head is located on the top of the measuring device body. The measuring head is mounted on the sampling assembly. The sampling assembly moves upward relative to the sampling tube, causing the measuring head to move upward relative to the sampling tube. The measuring head enters the sampling tube. The sampling assembly is close to the lower edge of the sampling tube. After the sampling assembly and the sampling tube are closed, a closed chamber is formed, and the measuring head is located in the closed chamber.

2. The flue gas denitration nitrogen oxide measuring device according to claim 1, characterized by: The sampling assembly includes a measuring head mounting plate with a hole-like structure in the middle, and the measuring head is installed inside the hole-like structure.

3. The flue gas denitration nitrogen oxide measuring device according to claim 2, characterized by: A sealing ring is provided above the measuring head mounting plate, and an annular groove is provided on the upper side of the sealing ring; a plug ring is connected to the bottom end of the sampling tube; the upper plug ring of the sampling assembly is inserted into the interior of the annular groove.

4. The flue gas denitration nitrogen oxide measuring apparatus according to claim 3, characterized by: An outer cylinder is rotatably connected above the measuring head mounting plate. An internally threaded rod is provided inside the outer cylinder. The upper part of the internally threaded rod is connected to the sampling tube. The rotation of the outer cylinder drives the internally threaded rod to move downwards, thereby moving the sampling tube closer to the measuring device body.

5. The flue gas denitration nitrogen oxide measuring device according to claim 1, wherein: The sampling tube is also equipped with a cleaning component; the cleaning component includes a fixing ring; a circular hole is provided on the top of the sampling tube, the circular hole is provided with an internal thread, the fixing ring is provided with an external thread, a threaded adjusting rod is provided in the middle of the fixing ring, a connecting rod is provided on the side of the threaded adjusting rod, a sliding rod is provided below the connecting rod, an insertion hole is provided on the upper surface of the fixing ring, the sliding rod is inserted into the insertion hole, and a cleaning cotton tube is provided below the fixing ring.

6. The flue gas denitration nitrogen oxide measuring apparatus according to claim 5, wherein: A connecting sleeve is provided below the fixing ring. An inner cavity is provided on the lower surface of the connecting sleeve. A slot is provided on the side of the inner cavity. An insert is provided on the side of the cleaning cotton tube. The upper part of the cleaning cotton tube is placed in the inner cavity of the connecting sleeve. The insert is snapped into the slot to form a stable connection between the cleaning cotton tube and the connecting sleeve.

7. The flue gas denitration nitrogen oxide measuring apparatus according to claim 6, characterized by: The bottom of the cleaning cotton tube is provided with a groove, which matches the shape of the measuring head.

Images