An ammonia slip on-line laser detection system for ammonia dual fuel engines

Abstract

The utility model discloses a kind of ammonia dual-fuel engine ammonia escape online laser detection systems in ammonia dual-fuel technical field for ship, including connecting pipe, gas chamber being located on connecting pipe, laser detection equipment being located in gas chamber, and fan equipment being communicated with one end of gas chamber through gas outlet pipeline, the other end of gas chamber is equipped with air inlet pipe one;The laser detection system further includes: protection mechanism, the protection mechanism includes heat preservation shell, heat conduction inner shell being located in heat preservation shell, spiral channel being opened in the wall thickness of heat conduction inner shell, and the communication shell of one end communication heat conduction inner shell inner chamber, the other end extends to the inner cavity of connecting pipe, the fan equipment of the first end communication of the spiral channel, the tail end is equipped with air inlet pipe two, the communication shell is located on the outer wall in connecting pipe and is equipped with air inlet. The utility model heats gas chamber and air inlet pipe one by waste gas, ensures that system reaches suitable temperature, reduces the risk that condensation and adsorption occur in sampling pipeline and gas chamber by waste gas.

Description

Technical Field

[0001] This utility model relates to the field of marine ammonia dual-fuel engines, specifically to an online laser detection system for ammonia escape in ammonia dual-fuel engines. Background Technology

[0002] Ammonia dual-fuel engines are widely used in the marine industry. In the application of ammonia dual-fuel engines, ammonia slip is a key issue affecting emission control and combustion efficiency. Real-time and accurate detection of ammonia slip concentration is crucial for optimizing engine operation and meeting environmental protection requirements.

[0003] Currently, common ammonia slip detection methods mostly employ extraction-type laser gas analysis systems. This involves drawing a portion of the exhaust gas from the exhaust end of an ammonia dual-fuel engine into a gas chamber via a sampling tube, and then analyzing the ammonia concentration in the exhaust gas using a laser detection device within the gas chamber. However, this method has the following drawbacks: during cold starts or when the ambient temperature is low, the extracted exhaust gas is prone to condensation and adsorption in the sampling tube and gas chamber, affecting the accuracy of the measurement results. Traditional systems mostly rely on external electricity for heating and insulation throughout the process, which is energy-efficient but increases operating costs. Therefore, we propose an online laser detection system for ammonia slip in ammonia dual-fuel engines. Utility Model Content

[0004] The purpose of this invention is to provide an online laser detection system for ammonia escape in a dual-fuel ammonia engine. This system solves the technical problem that in existing systems, during cold start-up or when the ambient temperature is low, the extracted exhaust gas is prone to condensation and adsorption in the sampling pipeline and gas chamber, which affects the accuracy of the measurement results.

[0005] This utility model achieves the above objectives through the following technical solutions: An online laser detection system for ammonia escape in a dual-fuel ammonia engine includes a connecting pipe connected to the exhaust end of the dual-fuel ammonia engine, a gas chamber disposed on the connecting pipe, a laser detection device disposed in the gas chamber for detecting ammonia data, and a fan device connected to one end of the gas chamber through an exhaust pipe, wherein the other end of the gas chamber is provided with an intake pipe. The laser detection system also includes a protective mechanism, which includes an insulated outer shell on the connecting pipe, a heat-conducting inner shell inside the insulated outer shell and fitted outside the air chamber, a spiral channel opened within the wall thickness of the heat-conducting inner shell, and a connecting shell with one end connected to the inner cavity of the heat-conducting inner shell and the other end extending to the inner cavity of the connecting pipe. The first end of the spiral channel is connected to a fan device through an air outlet pipe two, and its tail end is provided with an air inlet pipe two. Both the second air inlet pipe and the first air inlet pipe penetrate one side of the connecting shell and extend into the connecting shell. The connecting shell has an air inlet on its outer wall inside the connecting pipe.

[0006] A further improvement is that a friction ring is fitted on the outer wall of the heat-conducting inner shell and located inside the heat-insulating outer shell. A gear is engaged on the outer side of the friction ring. The gear is located between the friction ring and the heat-insulating outer shell and is fitted on one end of the shaft of the impeller. The other end of the shaft of the impeller extends into the connecting pipe and is driven to rotate by the exhaust gas flowing in the connecting pipe.

[0007] A further improvement is that the connecting pipe is equipped with a temperature detection sensor for detecting the temperature data of the exhaust gas inside the connecting pipe; The insulation shell has a cavity for the impeller to pass through. The outer wall of the impeller shaft is connected to a movable magnetic ring that can move along the axis of the impeller shaft via an elastic connector. The movable magnetic ring is located in the cavity. An electromagnetic ring that attracts the movable magnetic ring is fixed on one side of the inner wall of the cavity. The electromagnetic ring and the temperature detection sensor are electrically connected to an external controller.

[0008] A further improvement is that a second temperature sensor is provided inside the heat-conducting inner shell, and a solenoid valve is provided in both the first and second air outlet pipes. The second temperature sensor, the solenoid valve, and the fan are all electrically connected to an external controller.

[0009] A further improvement is that the vertical cross-section of the connecting shell is L-shaped, the air inlet is located at the bottom of the outer wall of the transverse section of the connecting shell, and a filter screen is provided inside the air inlet.

[0010] A further improvement is that an air storage shell is provided on one side of the heat insulation shell, and a matching piston is movably installed inside the air storage shell. One side of the piston is connected to the inner wall of the air storage shell through an elastic element. The outer wall of the air storage shell and the position below the piston are connected to the output end of the ventilation equipment through a one-way pipe. An air jet pipe is connected to the bottom of the air storage shell, and one end of the air jet pipe passes through the connecting pipe and the connecting shell and corresponds to the filter screen. The laser detection system also includes a sealing mechanism for sealing the connecting shell and opening the jet pipe, or opening the connecting shell and sealing the jet pipe.

[0011] A further improvement is that the sealing mechanism includes a sealing plate one, one end of which is movably inserted into the connecting shell and located inside the filter screen. The other end of the sealing plate one movably passes through the connecting pipe and is connected to one end of a telescopic device provided on the connecting pipe. The telescopic device is used to drive the sealing plate one to move downward to close the connecting shell or to move upward to open the connecting shell. A matching sealing plate two is rotatably provided inside the air jet pipe via a rotating shaft. One end of the rotating shaft passes through the side wall of the air jet pipe and is fitted with a gear two. The outer wall of the sealing plate one is provided with a rack that meshes with the gear two. The rack is used to drive the sealing plate two to rotate and open the air jet pipe when the sealing plate one moves downward to close the connecting shell, or to drive the sealing plate two to rotate and close the air jet pipe when the sealing plate one moves upward to open the connecting shell.

[0012] A further improvement is that an exhaust pipe is connected to the outer wall of the gas storage shell and below the piston, the other end of the exhaust pipe is connected to a connecting pipe, and a one-way valve and a pressure control valve are provided inside the exhaust pipe.

[0013] A further improvement is that both ends of the connecting pipe are provided with mounting flanges.

[0014] The beneficial effects of this utility model are as follows: This invention features a connecting pipe that communicates with the engine exhaust, a chamber with a built-in laser detection device, and an insulating outer shell and a heat-conducting inner shell surrounding the chamber. A fan draws exhaust gas into a spiral channel within the heat-conducting inner shell, heating the chamber and intake pipe to ensure the system reaches a suitable temperature before testing. The fan then draws the exhaust gas flowing through the connecting pipe into the chamber for laser detection. This effectively utilizes the exhaust gas's own heat energy to maintain the system's operating temperature, reducing the risk of condensation and adsorption of the exhaust gas in the sampling pipe and chamber. This significantly improves the accuracy, stability, and reliability of the test results, while also reducing energy consumption and operating costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the laser detection system of this utility model; Figure 2 This utility model Figure 1 Another perspective structural diagram; Figure 3 This utility model Figure 1 Partial structural sectional view; Figure 4 This utility model Figure 3 Enlarged view of structure A in the image; Figure 5 This utility model Figure 3 Enlarged view of structure B in the image.

[0016] In the diagram: 1. Connecting pipe; 2. Gas chamber; 3. Laser detection equipment; 4. Protective mechanism; 41. Insulated outer shell; 42. Heat-conducting inner shell; 43. Connecting shell; 44. Filter screen; 45. Fan equipment; 46. Exhaust pipe; 47. Spiral channel; 48. Friction ring; 49. Impeller; 410. Gear one; 411. Movable magnetic ring; 412. Electromagnetic ring; 413. Gas storage shell; 414. Elastic element; 415. Piston; 416. Telescopic device; 417. Sealing plate one; 418. Rack; 419. Gear two; 420. Jet pipe; 421. Sealing plate two; 422. Temperature detection sensor one; 423. Temperature detection sensor two. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0018] Example 1 Please see the appendix Figure 1-3 An online laser detection system for ammonia escape in a dual-fuel ammonia engine includes a connecting pipe 1 connected to the exhaust end of the dual-fuel ammonia engine, a gas chamber 2 (a sealed container that allows exhaust gas to pass through) on the connecting pipe 1, a laser detection device 3 for detecting ammonia data in the gas chamber 2, and a fan device 45 connected to one end of the gas chamber 2 through an exhaust pipe. The other end of the gas chamber 2 is provided with an intake pipe. Optionally, both ends of the connecting pipe 1 in this embodiment are provided with mounting flanges to facilitate the connection of the connecting pipe 1 to the exhaust end of the ammonia dual-fuel engine and the external exhaust gas treatment pipeline. Optionally, the air chamber 2 in this embodiment can be made of a metal thermally conductive material (such as stainless steel). Optionally, the laser detection device 3 in this embodiment includes a laser emitter, a laser receiver, and an ammonia concentration analyzer electrically connected to the laser receiver. The laser emitter and laser receiver are symmetrically embedded in the inner walls on both sides of the gas chamber 2. The ammonia concentration analyzer and the laser receiver can be connected wirelessly. The laser emitter generates a laser of a specific wavelength and directs it toward the gas to be tested. The laser detection end receives the laser signal after it passes through the gas and converts it into an electrical signal. The ammonia concentration analyzer calculates and outputs the ammonia concentration value in the gas in real time based on the signal using a built-in algorithm. This method is existing technology and will not be described in detail here. In some embodiments, the laser detection device 3 may also include a sampling probe and an ammonia escape analysis cabinet, wherein the detection end of the sampling probe is located inside the gas chamber 2, the sampling probe detects the ammonia content in the gas, and the data after detection is displayed in the ammonia escape analysis cabinet; of course, the laser detection device 3 is not limited to the above types, and will not be described in detail here. The laser detection system also includes: a protective mechanism 4, which includes an insulating shell 41 on the connecting pipe 1, a heat-conducting inner shell 42 inside the insulating shell 41 and sleeved on the outside of the air chamber 2, a spiral channel 47 opened in the wall thickness of the heat-conducting inner shell 42, and a connecting shell 43 with one end connected to the inner cavity of the heat-conducting inner shell 42 and the other end extending to the inner cavity of the connecting pipe 1. The connecting pipe 1 has an opening for the connecting shell 43 to pass through. A sealing element (such as a sealing ring) is provided at the connection between the connecting shell 43 and the opening. The first end of the spiral channel 47 is connected to a fan device 45 through an air outlet pipe 2, and its tail end is provided with an air inlet pipe 2. Both the second air inlet pipe and the first air inlet pipe pass through one side of the connecting shell 43 and extend into the connecting shell 43. An air inlet is opened on the outer wall of the connecting shell 43 located inside the connecting pipe 1.

[0019] Optionally, the heat-insulating shell 41 in this embodiment is made of heat-insulating material, such as including a metal outer layer and a rock wool layer disposed on the inner wall of the metal outer layer, but it is not limited to this one. The heat-insulating shell 41 is closed at the top and bottom, and it can be connected to the outer wall of the connecting pipe 1 by a bracket. Optionally, the heat-conducting inner shell 42 in this embodiment is made of copper-based powder metallurgy material, and its upper and lower ends are hollow. The outer diameter of the heat-conducting inner shell 42 is smaller than the inner diameter of the heat-insulating outer shell 41. Optionally, the connecting shell 43 in this embodiment can be made of a high-temperature and corrosion-resistant metal material, such as stainless steel, to ensure that it can work stably for a long time in a high-temperature and highly corrosive flue gas environment and effectively resist the chemical corrosion of media such as ammonia and water vapor. The blower device 45 is a conventional device in this field and will not be described in detail here. Both the first and second exhaust pipes can be connected to the input end of the blower device 45 through pipe connectors. By turning on the blower device 45, the exhaust gas flowing in the connecting pipe 1 can be actively drawn into the gas chamber 2 for ammonia detection, or it can be guided into the spiral channel 47 to surround and heat the first intake pipe and the gas chamber 2, thereby maintaining a suitable and stable temperature for the first intake pipe and the gas chamber 2 as a whole. This effectively prevents the exhaust gas to be tested from condensing or adsorbing due to temperature drop, ensuring the accuracy and reliability of the detection process.

[0020] Please see the appendix Figure 3-4 Preferably, in this embodiment, a friction ring 48 is fitted on the outer wall of the heat-conducting inner shell 42 and located inside the heat-insulating outer shell 41. The friction ring 48 is made of metal material, and a gear 410 meshes on the outer side of the friction ring 48. In this embodiment, the bottom of the circumferential outer wall of the friction ring 48 is provided with a number of tooth grooves in a ring array to mesh with the gear 410. The gear 410 is located between the friction ring 48 and the heat-insulating outer shell 41 and is fitted on one end of the shaft of the impeller component 49. The impeller component 49 includes a shaft and an impeller fitted on one end of the shaft. The other end of the shaft of the impeller component 49 extends into the connecting pipe 1 and is driven to rotate by the exhaust gas flowing in the connecting pipe 1. Specifically, the impeller in the impeller component 49 is located inside the connecting pipe 1. With the above settings, during the initial start-up phase of the ammonia dual-fuel engine when the exhaust gas temperature is low, the exhaust gas flow can be used to drive the impeller 49 to rotate, which in turn drives the friction ring 48 to rotate relative to the heat-conducting inner shell 42 via gear 410, generating frictional heat. This achieves active preheating of the air chamber 2 and the intake pipe, ensuring that they quickly reach the appropriate operating temperature and avoiding exhaust gas adsorption or condensation caused by low temperature.

[0021] Please see the appendix Figure 1-3 Preferably, the connecting pipe 1 in this embodiment is provided with a temperature detection sensor 422 for detecting the temperature data of the exhaust gas inside the connecting pipe 1. The temperature detection sensor 422 is a conventional electrical device in the art, and its model can be BCC034A, but it is not limited to this one. The heat-insulating outer shell 41 has a cavity inside its wall for the impeller 49 to pass through. The outer wall of the shaft of the impeller 49 is connected to a movable magnetic ring 411 that can move along the axis of the shaft of the impeller 49 via an elastic connector. The movable magnetic ring 411 is located in the cavity. Optionally, the elastic connector includes an elastic telescopic rod and a protrusion fixedly sleeved on the outer wall of the shaft of the impeller 49 and connected to one end of the elastic telescopic rod. An electromagnetic ring 412 that is electrically attracted to the movable magnetic ring 411 is fixedly provided on one side of the inner wall of the cavity. The electromagnetic ring 412 and the temperature detection sensor 422 are both electrically connected to an external controller. When the ammonia dual-fuel engine starts, as the exhaust gas temperature gradually rises, the temperature detection sensor 422 monitors the exhaust gas temperature in the connecting pipe 1 in real time. When the temperature reaches the preset threshold, it sends a signal to the external controller. The controller then controls the electromagnetic ring 412 to be energized to generate magnetic force to attract the movable magnetic ring 411. In turn, under the synergistic effect of the elastic connector, the shaft of the impeller 49 is fixed so that it will not rotate under the drive of the exhaust gas. This realizes the automatic start and stop of the friction heat generation preheating function according to the exhaust gas temperature, ensuring that the system operates efficiently and stably within the appropriate temperature range. Optionally, in this embodiment, when ammonia escape detection is not performed, the temperature detection sensor 422 is in the off state and the electromagnetic ring 412 is in the energized state.

[0022] Preferably, the inner heat-conducting shell 42 of this embodiment is provided with a second temperature detection sensor 423, which can be of the same model as the first temperature detection sensor 422, and will not be described in detail here. The second temperature detection sensor 423 is used to detect the temperature inside the inner heat-conducting shell 42. Both the first and second air outlet pipes are provided with solenoid valves, which are conventional electrical components in the art. During ammonia escape detection, temperature sensor 423 monitors the temperature inside the heat-conducting inner shell 42 in real time. If the detected temperature is lower than the preset threshold, a signal is sent to the external controller. The controller then closes the solenoid valve in the first outlet pipe and disconnects the power supply to the solenoid ring 412. At the same time, it opens the solenoid valve in the second outlet pipe and starts the fan 45. The fan 45 draws the exhaust gas in the connecting pipe 1 into the spiral channel 47 through the inlet and the second inlet pipe to heat the gas chamber 2 before discharging it. Meanwhile, the impeller 49 rotates under the drive of the exhaust gas and drives the friction ring 48 to move relative to the heat-conducting inner shell 42 through the gear, generating frictional heat. (In this state, if temperature sensor 422 has detected that the exhaust gas temperature in the connecting pipe 1 has reached the preset threshold, the controller only opens the solenoid valve in the second outlet pipe and does not close the solenoid ring 412, only using the heat of the exhaust gas for heating.) When the temperature of the inner cavity of the heat-conducting inner shell 42 reaches the preset threshold, the temperature detection sensor 423 sends a control signal to the external controller. At this time, the external controller controls the solenoid valve in the second outlet pipe to close, and the solenoid valve and solenoid ring 412 in the first outlet pipe to open. As a result, the friction ring 48 and the heat-conducting inner shell 42 no longer rotate relative to each other to generate frictional heat, and the exhaust gas no longer enters the spiral channel 47. The exhaust gas in the connecting pipe 1 is made to enter the air chamber 2 through the first inlet pipe by the fan equipment 45 for detection and then discharged. Throughout the process, temperature sensor 423, solenoid valve, and fan 45 are all electrically connected to the external controller.

[0023] Example 2 Please see the appendix Figure 3 and Figure 5 Based on Example 1, the vertical cross-section of the connecting shell 43 in this example is L-shaped. The air inlet is located at the bottom of the outer wall of the transverse section of the connecting shell 43, and a filter screen 44 (which can be a metal filter screen) is provided inside the air inlet to filter the intake exhaust gas, effectively blocking large particulate pollutants from entering the detection system, thereby reducing the burden on the subsequent air path and detection unit, and improving the overall working stability and service life.

[0024] Preferably, in this embodiment, the heat insulation shell 41 is provided with a gas storage shell 413 on one side, and a matching piston 415 is movably provided inside the gas storage shell 413. It should be noted that in order to ensure that the piston 415 can move under the drive of the incoming exhaust gas, a vent is provided at the top of the gas storage shell 413. One side of the piston 415 is connected to the inner wall of the gas storage shell 413 through an elastic member 414. The elastic member 414 can be a spring. In this embodiment, one end of the elastic member 414 is connected to the bottom of the piston 415, and the other end is connected to the top inner wall of the gas storage shell 413. The outer wall of the gas storage shell 413 and the position below the piston 415 are connected to the output end of the ventilation equipment 45 through a one-way pipe. In this embodiment, the one-way pipe is a pipe with a one-way valve inside, that is, the exhaust gas entering the gas storage shell 413 will not be discharged from the one-way pipe. The bottom of the gas storage shell 413 is connected to a jet pipe 420, and one end of the jet pipe 420 passes through the connecting pipe 1 and the connecting shell 43 and corresponds to the filter screen 44. The laser detection system also includes a sealing mechanism for sealing the connecting shell 43 and opening the jet pipe 420, or opening the connecting shell 43 and sealing the jet pipe 420.

[0025] In use, the connecting shell 43 is opened through the closed structure, and the jet pipe 420 is closed. At this time, the fan equipment 45 can normally draw the waste gas flowing in the connecting pipe 1 into the gas chamber 2 for ammonia escape detection or guide it into the spiral channel 47 for system heating. Subsequently, the waste gas is discharged through the fan equipment 45 and enters the gas storage shell 413. Since the jet pipe 420 is closed, the waste gas entering the gas storage shell 413 drives the piston 415 to move and squeeze the elastic element 414. After the ammonia escape detection, the connecting shell 43 is closed through the closed structure, and the jet pipe 420 is opened. At this time, the piston 415 moves in the opposite direction under the restoring force of the elastic element 414, compressing the waste gas stored in the gas storage shell 413 and causing it to be ejected at high speed through the jet pipe 420, forming a reverse airflow to flush the filter screen 44, thereby achieving automatic cleaning of the filter screen 44.

[0026] It should be noted that the backflush exhaust gas ejected through the jet pipe 420, after completing the cleaning of the filter screen 44, re-enters the main airflow in the connecting pipe 1 and flows into the external exhaust gas treatment pipeline for centralized purification treatment, thereby avoiding secondary pollution and meeting emission environmental protection requirements.

[0027] Please see the appendix Figure 3 and Figure 5Preferably, the sealing mechanism of this embodiment includes a sealing plate 417, one end of which is movably inserted into the connecting shell 43 and located inside the filter screen 44. The other end of the sealing plate 417 movably passes through the connecting pipe 1 and is connected to one end of a telescopic device 416 (which may be an electric telescopic rod) provided on the connecting pipe 1. Both the connecting shell 43 and the connecting pipe 1 have movable openings that cooperate with the sealing plate 417. A sealing element is embedded in the inner wall of the movable opening to ensure the sealing performance at the connection between the sealing plate 417 and the connecting shell 43 or the connecting pipe 1. The width of the sealing plate 417 is greater than the inner diameter of the connecting shell 43 and smaller than the outer diameter of the connecting shell 43. The vertical cross-section of the sealing plate 417 is L-shaped. The telescopic device 416 The sealing plate 417 is used to drive the sealing plate 417 to move downward to close the connecting shell 43 or to move upward to open the connecting shell 43. The jet pipe 420 is equipped with a matching sealing plate 421 that rotates through a rotating shaft. The sealing plate 421 is disc-shaped and its diameter is matched with the inner diameter of the jet pipe 420. An elastic sealing ring can be embedded in the outer circumference of the sealing plate 421 to enhance the sealing effect (of course, a sealing strip can also be set on the side wall of the sealing plate 417 located in the connecting shell 43 to enhance the sealing effect, which will not be described in detail here). One end of the rotating shaft passes through the side wall of the jet pipe 420 and is fitted with a gear 419. The outer wall of the sealing plate 417 is provided with a rack 418 that meshes with the gear 419. The rack 418 is used to drive the gear 419 to rotate when the sealing plate 417 moves downward to close the connecting shell 43, thereby driving the sealing plate 421 to rotate and open the jet pipe 420, or to drive the gear 419 to reverse and drive the sealing plate 421 to rotate and close the jet pipe 420 when the sealing plate 417 moves upward to open the connecting shell 43, thereby realizing the linkage control of the opening and closing of the connecting shell 43 and the jet pipe 420. Therefore, when performing ammonia escape detection, the telescopic device 416 is controlled to drive the sealing plate 417 to move upward to the preset position, and after the ammonia escape detection, the telescopic device 416 is controlled to drive the sealing plate 417 to reset downward. It should be noted that regardless of whether the sealing plate 417 closes or opens the connecting shell 43, the rack 418 and the gear are always in a meshing state, thereby ensuring the stability of the sealing plate 421 when it is opened or closed, and effectively resisting the influence of exhaust gas pressure.

[0028] Please see the appendix Figure 1-3 Preferably, in this embodiment, an exhaust pipe 46 is connected to the outer wall of the gas storage shell 413 and below the piston 415. The other end of the exhaust pipe 46 is connected to the connecting pipe 1. The exhaust pipe 46 is equipped with a one-way valve and a pressure control valve. The one-way valve is used to prevent the exhaust gas in the connecting pipe 1 from flowing back into the gas storage shell 413 through the exhaust pipe 46. The pressure control valve is a conventional electrical device in the art. When the exhaust gas pressure in the gas storage shell 413 exceeds a preset value, it can guide the excess exhaust gas back to the connecting pipe 1 through the exhaust pipe 46, thereby achieving safe and controllable pressure in the gas storage shell 413 and avoiding excessive pressure from affecting the movement of the piston 415 or causing sealing failure.

[0029] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. An online laser detection system for ammonia slip in a dual-fuel ammonia engine, characterized in that: It includes a connecting pipe (1) connected to the exhaust end of the ammonia dual-fuel engine, a gas chamber (2) provided on the connecting pipe (1), a laser detection device (3) provided in the gas chamber (2) for detecting ammonia data, and a fan device (45) connected to one end of the gas chamber (2) through an exhaust pipe. The other end of the gas chamber (2) is provided with an intake pipe. The laser detection system also includes: a protective mechanism (4), which includes an insulating shell (41) on the connecting pipe (1), a heat-conducting inner shell (42) inside the insulating shell (41) and sleeved on the outside of the air chamber (2), a spiral channel (47) opened in the wall thickness of the heat-conducting inner shell (42), and a connecting shell (43) with one end connected to the inner cavity of the heat-conducting inner shell (42) and the other end extending to the inner cavity of the connecting pipe (1). The first end of the spiral channel (47) is connected to a fan device (45) through an air outlet pipe two, and its tail end is provided with an air inlet pipe two. Both the air inlet pipe two and the air inlet pipe one pass through one side of the connecting shell (43) and extend into the connecting shell (43). The connecting shell (43) is provided with an air inlet on the outer wall inside the connecting pipe (1).

2. The laser detection system according to claim 1, characterized in that, A friction ring (48) is fitted on the outer wall of the heat-conducting inner shell (42) and inside the heat-insulating outer shell (41). A gear (410) meshes with the outer side of the friction ring (48). The gear (410) is located between the friction ring (48) and the heat-insulating outer shell (41) and is fitted on one end of the shaft of the impeller (49). The other end of the shaft of the impeller (49) extends into the connecting pipe (1) and is driven to rotate by the exhaust gas flowing in the connecting pipe (1).

3. The laser detection system according to claim 2, characterized in that, The connecting pipe (1) is equipped with a temperature detection sensor (422) for detecting the temperature data of the exhaust gas inside the connecting pipe (1); The heat-insulating shell (41) has a cavity inside its wall for the impeller (49) to pass through. The outer wall of the shaft of the impeller (49) is connected to a movable magnetic ring (411) that can move along the axis of the shaft of the impeller (49) by an elastic connector. The movable magnetic ring (411) is located in the cavity. An electromagnetic ring (412) that is electrically attracted to the movable magnetic ring (411) is fixed on one side of the inner wall of the cavity. The electromagnetic ring (412) and the temperature detection sensor (422) are both electrically connected to an external controller.

4. The laser detection system according to claim 3, characterized in that, The heat-conducting inner shell (42) is equipped with a second temperature detection sensor (423), and both the first and second air outlet pipes are equipped with solenoid valves. The second temperature detection sensor (423), the solenoid valves and the fan equipment (45) are all electrically connected to an external controller.

5. The laser detection system according to claim 1, characterized in that, The vertical cross section of the connecting shell (43) is L-shaped, and the air inlet is located at the bottom of the outer wall of the transverse section of the connecting shell (43), and a filter screen (44) is provided inside the air inlet.

6. The laser detection system according to claim 5, characterized in that, The heat-insulating shell (41) has a gas storage shell (413) on one side. A matching piston (415) is movably installed inside the gas storage shell (413). One side of the piston (415) is connected to the inner wall of the gas storage shell (413) through an elastic element (414). The outer wall of the gas storage shell (413) and the position below the piston (415) are connected to the output end of the ventilation equipment (45) through a one-way pipe. The bottom of the gas storage shell (413) is connected to a jet pipe (420), and one end of the jet pipe (420) passes through the connecting pipe (1) and the connecting shell (43) and corresponds to the filter screen (44). The laser detection system also includes a sealing mechanism for sealing the connecting shell (43) and opening the jet pipe (420) or opening the connecting shell (43) and sealing the jet pipe (420).

7. The laser detection system according to claim 6, characterized in that, The sealing mechanism includes a sealing plate (417) with one end movably inserted into the connecting shell (43) and located inside the filter screen (44). The other end of the sealing plate (417) movably passes through the connecting pipe (1) and is connected to one end of a telescopic device (416) provided on the connecting pipe (1). The telescopic device (416) is used to drive the sealing plate (417) to move downward to close the connecting shell (43) or to move upward to open the connecting shell (43). A matching sealing plate (417) is rotatably provided inside the jet pipe (420) via a rotating shaft. 21) One end of the rotating shaft passes through the side wall of the jet pipe (420) and is fitted with a gear two (419). The outer wall of the sealing plate one (417) is provided with a rack (418) that meshes with the gear two (419). The rack (418) is used to drive the sealing plate two (421) to rotate and open the jet pipe (420) when the sealing plate one (417) moves downward to close the connecting shell (43), or to drive the sealing plate two (421) to rotate and close the jet pipe (420) when the sealing plate one (417) moves upward to open the connecting shell (43).

8. The laser detection system according to claim 7, characterized in that, An exhaust pipe (46) is connected to the outer wall of the gas storage shell (413) and located below the piston (415). The other end of the exhaust pipe (46) is connected to the connecting pipe (1). A one-way valve and a pressure control valve are provided inside the exhaust pipe (46).

9. The laser detection system according to claim 1, characterized in that, Both ends of the connecting pipe (1) are provided with mounting flanges.

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