Waste gas treatment device for marine diesel engine
By using silicon carbide filter elements to filter particulate matter in marine diesel engine exhaust gas treatment devices, slowing down flow rates with spiral pipes, and increasing the contact area of desulfurization mechanisms, the problem of low treatment efficiency of existing devices under temperature influence has been solved, achieving efficient removal of sulfur oxides and nitrogen oxides, and improving the practicality and emission quality of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING ZEZHIYI TECHNOLOGY DEVELOPMENT CO LTD
- Filing Date
- 2025-09-17
- Publication Date
- 2026-05-12
AI Technical Summary
Existing marine diesel engine exhaust treatment devices are affected by temperature when treating nitrogen oxides, and particulate matter affects treatment efficiency, making it difficult to effectively reduce emissions of sulfur oxides and nitrogen oxides simultaneously.
The system uses silicon carbide filter elements to filter particulate matter, combined with spiral pipes to slow down the exhaust gas flow rate and spray pipes to increase the contact area of detergents. A desulfurization mechanism is designed to remove sulfides. The silicon carbide filter elements filter particulate matter, the spiral pipes enhance the treatment of nitrogen oxides, and the desulfurization mechanism increases the contact area to remove sulfides.
It effectively filters particulate matter, reduces heat loss, prevents nitrogen oxide treatment from being affected, enhances nitrogen oxide treatment effect, ensures that sulfide removal meets emission standards, and improves the practicality of the equipment and emission quality.
Smart Images
Figure CN224228745U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of waste gas treatment technology, specifically a waste gas treatment device for marine diesel engines. Background Technology
[0002] Marine diesel engine exhaust is one of the main sources of air pollutants generated during ship operation. Its composition is complex and its emissions are large, which not only has a significant impact on the marine ecological environment and air quality, but is also subject to strict control by the International Maritime Organization (IMO) and environmental regulations of various countries. Marine diesel engines use heavy oil (such as marine residual fuel oil HFO) and light diesel oil (MGO) as the main fuels. The exhaust gas produced after combustion can be divided into two categories: harmful pollutants and conventional gases. The main pollutants are sulfur oxides, nitrogen oxides and particulate matter.
[0003] Existing exhaust gas treatment devices for marine diesel engines mainly reduce the emissions of harmful substances such as sulfur oxides (SOx), nitrogen oxides (NOx), and particulate matter (PM). The treatment of nitrogen oxides is affected by temperature and often requires the installation of heating devices. At the same time, particulate matter also affects the treatment efficiency of nitrogen oxides. Therefore, an exhaust gas treatment device for marine diesel engines is proposed to address the above problems. Utility Model Content
[0004] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model proposes an exhaust gas treatment device for marine diesel engines.
[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: The exhaust gas treatment device for marine diesel engines of this utility model includes an exhaust gas inlet, a nitrogen oxide treatment mechanism and a desulfurization mechanism. A silicon carbide filter element is installed inside the exhaust gas inlet. The silicon carbide filter element is used to filter particles in the exhaust gas. The output end of the exhaust gas inlet is connected to the lower end of the outer wall of the nitrogen oxide treatment mechanism. A liquid storage tank is connected to the top axis of the nitrogen oxide treatment mechanism. A solenoid valve is installed at the bottom axis of the liquid storage tank and between the top axis of the nitrogen oxide treatment mechanism and the bottom axis of the nitrogen oxide treatment mechanism. The output end of the nitrogen oxide treatment mechanism is connected to the input end of the desulfurization mechanism.
[0006] The nitrogen oxide treatment mechanism includes a housing, a nozzle is provided at the axis of the housing, and a spiral pipe is provided on the inner wall of the housing and on the outer wall of the nozzle.
[0007] The desulfurization mechanism includes a tank, a spray pipe is installed at the center of the tank, a water inlet pipe is installed at the input end of the spray pipe, and the spray pipe is cross-shaped.
[0008] Preferably, a plurality of atomizing nozzles are provided inside the spiral pipe and on the outer wall of the nozzle, and the input end of the spiral pipe is connected to the output end pipe of the exhaust gas inlet.
[0009] Preferably, an atomizing nozzle 2 is provided at the bottom of the spray pipe, and a demisting baffle is provided inside the tank and at the top of the spray pipe.
[0010] Preferably, the output end of the spiral pipe is connected to an air outlet, and the output end of the liquid storage tank is connected to the input end of the nozzle.
[0011] Preferably, a packing layer is provided inside the tank and at the bottom of the spray pipe, and a wastewater pool is provided at the bottom of the inner wall of the tank and at the bottom of the packing layer.
[0012] Preferably, the upper end of the outer wall of the nitrogen oxide treatment mechanism is provided with an air outlet, the output end of the air outlet is connected to a connecting pipe, the output end of the connecting pipe is connected to an air inlet, the output end of the air inlet is connected to the lower end of the outer wall of the desulfurization mechanism, an exhaust port is fixedly connected to the top axis of the desulfurization mechanism, and the air inlet is installed in the lower part of the packing layer and located in the upper part of the wastewater pool.
[0013] The beneficial effects of this utility model are:
[0014] 1. This utility model provides an exhaust gas treatment device for marine diesel engines. Through the installation of a silicon carbide filter element, particulate matter in the exhaust gas is effectively filtered with less heat loss, preventing it from affecting the normal operation of the nitrogen oxide treatment mechanism. The desulfurization mechanism can remove the remaining sulfides in the exhaust gas to meet emission standards, thus improving the practicality of the device.
[0015] 2. This utility model provides an exhaust gas treatment device for marine diesel engines. Through the installation of a spiral pipe, the flow rate of the exhaust gas is effectively slowed down, allowing the exhaust gas to fully contact the detergent, preventing residual nitrogen oxides in the exhaust gas from affecting the operation of the desulfurization mechanism, enhancing the treatment of nitrogen oxides, and making the discharged exhaust gas cleaner.
[0016] 3. This utility model provides a waste gas treatment device for marine diesel engines. Through the desulfurization mechanism, it effectively removes sulfides from the waste gas. The specially shaped spray pipe effectively increases the spray area and the contact area between the detergent and the sulfides in the waste gas, thus fully removing the sulfides from the waste gas to meet emission requirements. Attached Figure Description
[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:
[0018] Figure 1 This is a perspective view of the present invention;
[0019] Figure 2 This is a perspective view of the nitrogen oxide treatment mechanism in this utility model.
[0020] Figure 3 This is a three-dimensional cross-sectional view of the desulfurization mechanism in this utility model.
[0021] Legend:
[0022] 1. Exhaust gas inlet; 11. Silicon carbide filter element; 2. Nitrogen oxide treatment mechanism; 21. Outer shell; 22. Spiral pipe; 23. Atomizing nozzle one; 24. Spray pipe; 25. Gas outlet; 3. Liquid storage tank; 31. Solenoid valve; 4. Connecting pipe; 5. Desulfurization mechanism; 51. Tank body; 52. Air inlet; 53. Water inlet pipe; 54. Spray pipe; 55. Atomizing nozzle two; 56. Demisting baffle; 57. Packing layer; 58. Wastewater pool; 59. Exhaust outlet. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0024] Specific implementation examples are given below.
[0025] Please see Figure 1 - Figure 3 As shown, this utility model provides an exhaust gas treatment device for marine diesel engines, including an exhaust gas inlet 1, a nitrogen oxide treatment mechanism 2, and a desulfurization mechanism 5. A silicon carbide filter element 11 is installed inside the exhaust gas inlet 1 to filter particles in the exhaust gas. The output end of the exhaust gas inlet 1 is connected to the lower end of the outer wall of the nitrogen oxide treatment mechanism 2. A liquid storage tank 3 is connected to the top axis of the nitrogen oxide treatment mechanism 2. A solenoid valve 31 is installed at the bottom axis of the liquid storage tank 3 and between the top axis of the nitrogen oxide treatment mechanism 2 and the bottom axis of the nitrogen oxide treatment mechanism 2. The output end of the nitrogen oxide treatment mechanism 2 is connected to the input end of the desulfurization mechanism 5.
[0026] The upper end of the outer wall of the nitrogen oxide treatment unit 2 is provided with an outlet 25. The outlet 25 is connected to a connecting pipe 4. The outlet 4 is connected to an inlet 52. The outlet 52 is connected to the lower end of the outer wall of the desulfurization unit 5. An exhaust port 59 is fixedly connected to the top axis of the desulfurization unit 5. The inlet 52 is installed in the lower part of the packing layer 57 and located in the upper part of the wastewater pool 58.
[0027] During operation, exhaust gas is introduced into exhaust gas inlet 1. Particulate matter is removed by the silicon carbide filter element 11 in exhaust gas inlet 1. The exhaust gas with particulate matter removed then enters the nitrogen oxide treatment unit 2 to remove nitrogen oxides from the exhaust gas. It then enters the connecting pipe 4 through the outlet 25, and from the connecting pipe 4, it enters the desulfurization unit 5 through the inlet 52 to desulfurize the exhaust gas. Finally, it is discharged through the exhaust port 59. The silicon carbide filter element 11 effectively filters particulate matter in the exhaust gas with minimal heat loss, preventing it from affecting the normal operation of the nitrogen oxide treatment unit 2. The desulfurization unit 5 removes residual sulfides from the exhaust gas, meeting emission standards and improving the practicality of the device.
[0028] like Figure 2 As shown, the nitrogen oxide treatment mechanism 2 includes a housing 21, a nozzle 24 is provided at the axis of the housing 21, a spiral pipe 22 is provided on the inner wall of the housing 21 and on the outer wall of the nozzle 24, the output end of the spiral pipe 22 is connected to an outlet 25, and the output end of the liquid storage tank 3 is connected to the input end of the nozzle 24.
[0029] During operation, the exhaust gas for removing particulate matter enters the spiral pipe 22 and spirals upward. The solenoid valve 31 is activated, and the detergent in the storage tank 3 enters the spray pipe 24, causing the atomizing nozzle 23 on the spray pipe 24 to spray out the detergent, removing nitrogen oxides from the exhaust gas in the spiral pipe 22. The detergent then enters the connecting pipe 4 through the outlet 25. The spiral pipe 22 effectively slows down the flow rate of the exhaust gas, allowing the exhaust gas to fully contact the detergent, preventing residual nitrogen oxides in the exhaust gas from affecting the operation of the desulfurization unit 5, enhancing the treatment of nitrogen oxides, and making the discharged exhaust gas cleaner.
[0030] like Figure 3 As shown, the desulfurization mechanism 5 includes a tank 51. A spray pipe 54 is installed at the center of the tank 51. A water inlet pipe 53 is installed at the extension of the input end of the spray pipe 54. The spray pipe 54 is cross-shaped. An atomizing nozzle 55 is installed at the bottom of the spray pipe 54. A demisting baffle 56 is installed inside the tank 51 and at the top of the spray pipe 54. A packing layer 57 is installed inside the tank 51 and at the bottom of the spray pipe 54. A wastewater pool 58 is installed at the bottom of the inner wall of the tank 51 and at the bottom of the packing layer 57.
[0031] During operation, the remaining exhaust gas enters the inlet 52 through the connecting pipe 4, and then enters the tank 51 through the inlet 52. Detergent is introduced into the water inlet pipe 53, and the detergent in the water inlet pipe 53 fills the spray pipe 54, so that the atomizing nozzles 2 55 on the spray pipe 54 spray the detergent evenly downwards. When the exhaust gas is discharged upwards, it comes into full contact with the detergent sprayed by the atomizing nozzles 2 55 above in the packing layer 57, removing sulfur oxides from the exhaust gas. The waste liquid will fall into the wastewater pool 58. The exhaust gas after the sulfur oxides are removed passes through the demisting baffle 56, which effectively removes the atomized detergent from the gas. Finally, it is discharged through the exhaust port 59. The specially shaped spray pipe 54 effectively increases the spraying area and the contact area between the detergent and the sulfur oxides in the exhaust gas, so as to fully remove the sulfur oxides in the exhaust gas and meet the emission requirements.
[0032] Working principle: When the device is running, firstly, the exhaust gas from the marine diesel engine is introduced into the exhaust gas inlet 1, and the particulate matter is effectively removed by the silicon carbide filter element 11 in the exhaust gas inlet 1.
[0033] Secondly, the exhaust gas with particulate matter removed enters the spiral pipe 22 and spirals upward. The solenoid valve 31 is activated, and the detergent in the storage tank 3 enters the spray pipe 24, causing the atomizing nozzle 23 on the spray pipe 24 to spray out the detergent, removing nitrogen oxides from the exhaust gas in the spiral pipe 22, and entering the connecting pipe 4 through the outlet 25.
[0034] Finally, the remaining exhaust gas enters the inlet 52 through the connecting pipe 4, and then enters the tank 51 through the inlet 52. Detergent is introduced into the water inlet pipe 53, and the detergent in the water inlet pipe 53 fills the spray pipe 54, so that the atomizing nozzles 2 55 on the spray pipe 54 spray the detergent evenly downwards. When the exhaust gas is discharged upwards, it comes into full contact with the detergent sprayed by the atomizing nozzles 2 55 above in the packing layer 57, removing sulfur oxides from the exhaust gas. The waste liquid will fall into the wastewater pool 58. The exhaust gas after removing sulfur oxides passes through the demisting baffle 56, which effectively removes the atomized detergent from the gas, and finally discharges through the exhaust port 59.
[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. A marine diesel engine exhaust gas treatment device, comprising an exhaust gas inlet (1), a nitrogen oxide treatment mechanism (2), and a desulfurization mechanism (5), characterized in that: The exhaust gas inlet (1) is equipped with a silicon carbide filter element (11) for filtering particles in the exhaust gas. The output end of the exhaust gas inlet (1) is connected to the lower end of the outer wall of the nitrogen oxide treatment mechanism (2). The top axis of the nitrogen oxide treatment mechanism (2) is connected to a liquid storage tank (3). The bottom axis of the liquid storage tank (3) is located between the top axis of the nitrogen oxide treatment mechanism (2) and the bottom axis of the nitrogen oxide treatment mechanism (2). The output end of the nitrogen oxide treatment mechanism (2) is connected to the input end of the desulfurization mechanism (5). The nitrogen oxide treatment mechanism (2) includes a housing (21), a nozzle (24) is provided at the axis of the housing (21), and a spiral pipe (22) is provided on the inner wall of the housing (21) and on the outer wall of the nozzle (24). The desulfurization mechanism (5) includes a tank (51), a spray pipe (54) is provided at the center of the tank (51), a water inlet pipe (53) is provided at the extension of the input end of the spray pipe (54), and the spray pipe (54) is cross-shaped.
2. The exhaust gas treatment device for marine diesel engines according to claim 1, characterized in that: A plurality of atomizing nozzles (23) are provided inside the spiral pipe (22) and on the outer wall of the nozzle (24). The input end of the spiral pipe (22) is connected to the output end of the exhaust gas inlet (1).
3. The exhaust gas treatment device for marine diesel engines according to claim 1, characterized in that: The bottom of the spray pipe (54) is provided with an atomizing nozzle (55), and the inside of the tank (51) and the top of the spray pipe (54) is provided with a demisting baffle (56).
4. The exhaust gas treatment device for marine diesel engines according to claim 2, characterized in that: The output end of the spiral pipe (22) is connected to an air outlet (25), and the output end of the liquid storage tank (3) is connected to the input end of the nozzle (24).
5. The exhaust gas treatment device for marine diesel engines according to claim 3, characterized in that: A packing layer (57) is provided inside the tank (51) and at the bottom of the spray pipe (54), and a wastewater pool (58) is provided at the bottom of the inner wall of the tank (51) and at the bottom of the packing layer (57).
6. The exhaust gas treatment device for marine diesel engines according to claim 1, characterized in that: The upper end of the outer wall of the nitrogen oxide treatment mechanism (2) is provided with an air outlet (25). The output end of the air outlet (25) is connected to a connecting pipe (4). The output end of the connecting pipe (4) is connected to an air inlet (52). The output end of the air inlet (52) is connected to the lower end of the outer wall of the desulfurization mechanism (5). An exhaust port (59) is fixedly connected to the top axis of the desulfurization mechanism (5). The air inlet (52) is installed in the lower part of the packing layer (57) and located in the upper part of the wastewater pool (58).