A land-based full-scale diesel engine exhaust injection test system

Abstract

The application discloses a land full-scale diesel engine exhaust spraying test system, which comprises a flue gas generating device, an exhaust pipe, a spraying cooling system, a side simulation structure, a sailing wind simulation device, a waste water collecting pool and a monitoring mechanism; the flue gas generating device comprises a same type diesel engine as actually used by a ship; the exhaust pipe is arranged according to the actual exhaust pipeline of the ship; the exhaust spraying device of the spraying cooling system is arranged on the straight pipe of the exhaust pipe; the side simulation structure is arranged at the exhaust port of the exhaust pipe; the sailing wind simulation device is arranged at the side of the exhaust port of the exhaust pipe; the waste water collecting pool is arranged below the exhaust port of the exhaust pipe; the data control box of the monitoring mechanism receives the data of temperature sensors, pressure sensors and flow meters and transmits the data to an upper computer; and according to the received data, the spraying cooling system is controlled to work. The application can accurately simulate the exhaust working condition of the diesel engine of the ship and obtain accurate exhaust spraying effect data.

Description

Technical Field

[0001] This invention relates to a testing apparatus, specifically to a land-based full-scale diesel engine exhaust spray testing system. Background Technology

[0002] Diesel engine exhaust temperatures are generally quite high, sometimes exceeding 500℃, and are accompanied by black smoke, which significantly impacts the working environment on ships. Therefore, exhaust spray systems are needed at the end of the exhaust pipes to reduce exhaust temperature and black smoke concentration, thereby improving the living and working conditions for crew members. The cooling and black smoke collection processes of exhaust spray systems involve complex physical processes such as mixing, phase change, and aggregation of high-temperature steam, water, and particles. Experimental research is required to analyze the impact of various parameters on the effectiveness of the exhaust spray system and to verify its effectiveness.

[0003] Currently, most related tests are scaled-down model tests, which cannot realistically simulate the high-temperature multiphase heat transfer and liquid-solid phase interaction at full scale, and cannot accurately evaluate the cooling and soot removal performance of exhaust spray devices. Furthermore, for side exhaust, the exhaust port is generally located on the side near the waterline. After being discharged from the exhaust port, the exhaust impacts the sea surface, which has a significant impact on the exhaust wake; current test devices do not consider this factor. The inclination angle of the side plating affects the direction of the exhaust wake, and the navigation wind also affects the development of the exhaust wake and its infrared characteristics, but corresponding test systems are currently lacking. Summary of the Invention

[0004] The purpose of this invention is to provide a land-based full-scale diesel engine exhaust spray test system. This system can accurately simulate the exhaust conditions of a ship's diesel engine, ensure the consistency between the test system and the actual ship, meet the requirements of diesel engine exhaust spray test, and obtain accurate exhaust spray effect data.

[0005] The technical solution adopted in this invention is:

[0006] A land-based full-scale diesel engine exhaust spray test system includes a flue gas generator, an exhaust pipe, a spray cooling system, a side-side simulation structure, a navigation wind simulation device, a wastewater collection pool, and a monitoring mechanism.

[0007] The flue gas generating device includes a diesel engine of the same type as that actually used on ships;

[0008] The exhaust pipe is arranged according to the actual exhaust pipe layout of the ship, and the material and diameter of the exhaust pipe are consistent with those of the actual ship; the outer surface of the exhaust pipe is covered with heat insulation material similar to that of the actual ship; the air inlet end of the exhaust pipe is connected to the flue gas generating device.

[0009] The exhaust spray device of the spray cooling system is placed next to the straight pipe of the exhaust pipe.

[0010] The simulated side structure is located at the exhaust port of the exhaust pipe. The simulated side structure is made of steel plate with the same thickness as the actual ship, coated with hull paint on the surface, and covered with heat insulation material on the back.

[0011] The navigation wind simulation device is placed on the side of the exhaust port of the exhaust pipe. It adopts a combined fan, and the wind speed is adjusted according to the flight speed.

[0012] The wastewater collection tank is located below the exhaust port of the exhaust pipe;

[0013] The monitoring system includes a first temperature sensor, a pressure sensor, a second temperature sensor, a flow meter, a data control box, and a host computer. Two sets of the first and second temperature sensors are installed upstream and downstream of the exhaust spray device, respectively. The second temperature sensor is installed at the exhaust port of the exhaust pipe. The flow meter is installed on the cooling water supply pipeline of the spray cooling system. The data control box receives data from the temperature sensor, pressure sensor, second temperature sensor, and flow meter, and transmits this data to the host computer or mobile terminal. Based on the received data, the data control box controls the operation of the spray cooling system (the data control box collects and converts analog data, transmitting it to the host computer system or mobile terminal via a set Ethernet interface; the data control box also controls the inlet regulating valve on the spray water pipeline).

[0014] According to the above scheme, the size of the simulated structure on the side is no less than three times the diameter of the exhaust pipe, so as to more realistically simulate the hull plate at the exhaust port and make the test results more accurate.

[0015] According to the above scheme, the size of the air outlet of the navigation wind simulation device is more than four times the diameter of the exhaust port in order to make the test results more accurate.

[0016] According to the above scheme, the navigation wind simulation device includes two sets of wind turbines arranged in parallel, each set of wind turbines including two wind turbines in parallel, so as to simulate navigation wind more realistically.

[0017] According to the above scheme, the straight pipe section of the exhaust pipe is a number of exhaust pipe sections with the same length as the exhaust spray device and the same flange interface, so as to more realistically simulate spray cooling and make the test results closer to reality.

[0018] According to the above scheme, there are multiple second temperature sensors, which are respectively installed at the center and around the exhaust port of the exhaust pipe to ensure accurate measurement.

[0019] According to the above scheme, the spray cooling system includes a water supply tank, a spray pump, and an exhaust spray device; water from the water supply tank is pumped into the exhaust spray device through the spray pump to achieve spray cooling of the exhaust pipe; the data control box controls the operation of the spray pump and the exhaust spray device.

[0020] According to the above scheme, the flue gas generating device, exhaust pipe, spray cooling system, side simulation structure, navigation wind simulation device, and wastewater collection pool are placed on the test bench.

[0021] According to the above scheme, the size of the wastewater collection pool shall be no less than 8 times the diameter of the exhaust port.

[0022] The beneficial effects of this invention are as follows:

[0023] By setting up a flue gas generator, exhaust pipe, spray cooling system, side simulated structure, navigation wind simulated device, and wastewater collection pool, the exhaust conditions of the ship's diesel engine are accurately simulated to ensure the consistency between the test system and the actual ship, thereby ensuring the accuracy of the test data and providing a basis for subsequent improvements.

[0024] It can realistically simulate the complex process of diesel engine exhaust spray cooling under real-scale conditions, meeting the needs of diesel engine exhaust spray performance improvement and verification.

[0025] The exhaust pipes are installed according to the actual course to form an exhaust system. A side-mounted simulation structure, a wastewater collection pool, a navigation wind simulation device, and a monitoring system are set up to ensure the consistency between the test system and the actual ship and to meet the requirements of the diesel engine exhaust spray test.

[0026] The exhaust gas generator is supplied by the exhaust gas from the same type of diesel engine actually used on the ship, ensuring that parameters such as exhaust temperature, flow rate, and exhaust gas composition are consistent with those of the actual ship.

[0027] The exhaust pipes are arranged according to the actual exhaust pipe layout of the ship. The material and diameter of the exhaust pipes are consistent with the actual ship. The outer surface of the exhaust pipes is covered with heat insulation material similar to that of the actual ship to ensure that the thermal boundary conditions are consistent with reality and reduce the error in the assessment of cooling effect.

[0028] The hull-side simulation structure is used to simulate the hull plating at the exhaust port of an actual diesel engine.

[0029] It can achieve 1:1 prototype testing and verification, and ensure that the exhaust temperature, flow rate, composition, etc. are consistent with the actual ship;

[0030] By setting up a simulated structure on the hull side, the interaction between exhaust gas and sea level, hull plating, etc., can be taken into account, making the test results more accurate. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0032] Figure 1 This is a simplified schematic diagram of a land-based full-scale diesel engine exhaust spray test system;

[0033] Figure 2This is a schematic diagram of the installation of a land-based full-scale diesel engine exhaust spray test system on a test bench;

[0034] Figure 3 This is a side view of the land-based full-scale diesel engine exhaust spray test system on the test bench.

[0035] Figure 4 This is a schematic diagram of the navigation wind simulation device;

[0036] Figure 5 It is a diagram illustrating the monitoring principles of a monitoring agency;

[0037] Figure 6 This is a schematic diagram of the installation of the second temperature sensor;

[0038] Figure 7 yes Figure 2 Enlarged view of A in the image;

[0039] In the diagram: 1. Smoke generator, 2. Exhaust pipe, 3. Spray cooling system, 3.1. Water supply tank, 3.2. Spray pump, 3.3. Exhaust spray device, 4. Side simulation structure, 5. Navigation wind simulation device, 6. Wastewater collection pool, 7. Monitoring mechanism, 7.1. Second temperature sensor, 7.2. Data control box, 7.3. Host computer, 8. Test bench. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0041] See Figures 1-7 A land-based full-scale diesel engine exhaust spray test system includes a flue gas generating device 1, an exhaust pipe 2, a spray cooling system 3, a side-side simulation structure 4, a navigation wind simulation device 5, a wastewater collection pool 6, and a monitoring mechanism 7. The flue gas generating device 1, exhaust pipe 2, spray cooling system 3, side-side simulation structure 4, navigation wind simulation device 5, and wastewater collection pool 6 are placed on a test bench 8.

[0042] The flue gas generating device 1 includes a diesel engine of the same type as that actually used on the ship, to ensure that the working medium (flue gas) used in the test is consistent with the actual one, and to ensure that its thermal characteristics and soot composition meet the test requirements.

[0043] Exhaust pipe 2 is arranged according to the actual exhaust pipeline of the ship, and the material and diameter of the exhaust pipe are consistent with the actual ship; the outer surface of exhaust pipe 2 is covered with heat insulation material similar to that of the actual ship; the air inlet end of exhaust pipe 2 is connected to the flue gas generating device 1, ensuring that the pipeline and operating boundary are consistent with the actual ship. The straight pipe section of exhaust pipe 2 consists of several exhaust pipe sections with the same length and flange interface as the exhaust spray device 3.3 of the spray cooling system 3, which facilitates changing the installation position of the exhaust spray device 3 and enables the analysis of the impact of different installation positions.

[0044] The spray cooling system 3 includes a water supply tank 3.1, a spray pump 3.2, and an exhaust spray device 3.3. Water from the water supply tank 3.1 is pumped into the exhaust spray device 3.2 by the spray pump 3.2 to achieve spray cooling of the exhaust pipe 2.

[0045] The hull-side simulation structure 4 is used to simulate the hull plating background at the exhaust port of an actual diesel engine. It is located at the exhaust port of the exhaust pipe 2. The hull-side simulation structure 4 is made of steel plate with the same thickness as the actual ship, coated with hull paint, and covered with heat insulation material on the back. In order to more realistically simulate the hull plating at the exhaust port, the size of the hull-side simulation structure 4 is no less than 3 times the diameter of the exhaust pipe 2.

[0046] The navigation wind simulation device 5 is located on the side of the exhaust port of the exhaust pipe 2. It includes two sets of fan groups arranged in parallel, each set consisting of two fans arranged in parallel. The size of the air outlet of the navigation wind simulation device 5 is more than four times the diameter of the exhaust port, and the wind speed is adjusted according to the ship's speed to more realistically simulate navigation wind. The navigation wind simulation device 5 simulates the effect of navigation wind on exhaust.

[0047] Wastewater collection tank 6 is located below the exhaust port of exhaust pipe 2, and its size is not less than 8 times the diameter of the exhaust port. Wastewater collection tank 6 is used for wastewater collection and also serves as a simulated water surface.

[0048] The monitoring unit 7 includes a first temperature sensor, a pressure sensor, a second temperature sensor 7.1, a flow meter, a data control box 7.2, and a host computer 7.3. There are two sets of first temperature and pressure sensors, installed upstream and downstream of the exhaust spray device 3.3, respectively. Multiple second temperature sensors 7.1 are installed at the center and around the exhaust port of the exhaust pipe 2. The flow meter is installed on the cooling water supply pipeline (main pipe and branch pipes) of the spray cooling system. The data control box 7.2 receives data from the temperature sensors, pressure sensors, second temperature sensors 7.1, and flow meters, and transmits this data to the host computer 7.3 or a mobile terminal. Based on the received data, the data control box 7.1 controls the operation of the spray cooling system (e.g., controlling the inlet regulating valve on the spray water pipeline). The exhaust spray device 3.3 of the spray cooling system 3 is located next to the straight pipe of the exhaust pipe 2.

[0049] The experimental implementation steps are as follows:

[0050] (1) Start the flue gas generator 1, adjust the diesel engine load according to the operating condition table, and wait for the exhaust parameters to stabilize;

[0051] (2) According to the working condition table, turn on the exhaust spray device 3.3 at different installation locations, adjust the water supply parameters, and start recording the exhaust temperature results after the status has stabilized for a period of time.

[0052] (3) Infrared thermal images of the exhaust port and the simulated side structure were recorded at different azimuth angles;

[0053] (4) Turn on the navigation wind simulation device 5 and repeat steps (2) and (3);

[0054] (5) Turn off the navigation wind simulation device 5, the exhaust spray device 3.3, and finally turn off the flue gas generator 1. The test ends.

[0055] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A land-based full-scale diesel engine exhaust spray test system, characterized in that: This includes a flue gas generator, exhaust pipe, spray cooling system, side-mounted simulation structure, navigation wind simulation device, wastewater collection pool, and monitoring mechanism; The flue gas generating device includes a diesel engine of the same type as that actually used on ships; The exhaust pipe is arranged according to the actual exhaust pipe layout of the ship, and the material and diameter of the exhaust pipe are consistent with those of the actual ship; the outer surface of the exhaust pipe is covered with heat insulation material similar to that of the actual ship; the air inlet end of the exhaust pipe is connected to the flue gas generating device. The exhaust spray device of the spray cooling system is placed next to the straight pipe of the exhaust pipe. The simulated side structure is located at the exhaust port of the exhaust pipe. The simulated side structure is made of steel plate with the same thickness as the actual ship, coated with hull paint on the surface, and covered with heat insulation material on the back. The navigation wind simulation device is placed on the side of the exhaust port of the exhaust pipe. It adopts a combined fan, and the wind speed is adjusted according to the flight speed. The wastewater collection tank is located below the exhaust port of the exhaust pipe. The wastewater collection tank is used for wastewater collection and also serves as a simulated water surface. The monitoring system includes a first temperature sensor, a pressure sensor, a second temperature sensor, a flow meter, a data control box, and a host computer. There are two sets of the first temperature sensor and pressure sensor, installed upstream and downstream of the exhaust spray device, respectively. The second temperature sensor is installed at the exhaust port of the exhaust pipe. The flow meter is installed on the cooling water supply pipeline of the spray cooling system. The data control box receives data from the temperature sensor, pressure sensor, second temperature sensor, and flow meter, and transmits this data to the host computer. Based on the received data, the data control box controls the operation of the spray cooling system.

2. The land-based full-scale diesel engine exhaust spray test system according to claim 1, characterized in that: The size of the simulated structure on the side of the ship is no less than three times the diameter of the exhaust pipe.

3. The land-based full-scale diesel engine exhaust spray test system according to claim 1, characterized in that: The size of the air outlet of the navigation wind simulation device is more than four times the diameter of the exhaust port.

4. The land-based full-scale diesel engine exhaust spray test system according to claim 1 or 3, characterized in that: The navigation wind simulation device includes two sets of wind turbines arranged in parallel, each set of wind turbines including two wind turbines arranged in parallel.

5. The land-based full-scale diesel engine exhaust spray test system according to claim 1, characterized in that, The straight pipe section of the exhaust pipe consists of several exhaust pipe sections with the same length as the exhaust spray device and the same flange interface.

6. The land-based full-scale diesel engine exhaust spray test system according to claim 1, characterized in that: There are multiple second temperature sensors, which are respectively installed at the center and around the exhaust port of the exhaust pipe.

7. The land-based full-scale diesel engine exhaust spray test system according to claim 1, characterized in that: The spray cooling system includes a water supply tank, a spray pump, and an exhaust spray device; water from the water supply tank is pumped into the exhaust spray device by the spray pump to achieve spray cooling of the exhaust pipe; the data control box controls the operation of the spray pump and the exhaust spray device.

8. The land-based full-scale diesel engine exhaust spray test system according to claim 1, characterized in that: The flue gas generator, exhaust pipe, spray cooling system, side-mounted simulation structure, navigation wind simulation device, and wastewater collection pool are placed on the test bench.

9. The land-based full-scale diesel engine exhaust spray test system according to claim 1, characterized in that: The size of the wastewater collection tank shall be no less than 8 times the diameter of the exhaust port.

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