Tail gas purification system for high-power diesel engine of inland ship
The system addresses temperature challenges in inland ship exhaust treatment by using temperature-adjusting devices and multiple stages to ensure efficient pollutant removal, enhancing treatment efficiency and reducing emissions.
Patent Information
- Application Number
- CN202422290625.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-19
AI Technical Summary
The exhaust temperature of the high-power diesel engine of inland ships is low during the cold start stage and cannot reach the working temperature of the exhaust gas treatment device, making it difficult to purify pollutants; and when operating at high temperatures, the exhaust temperature exceeds the allowable range of the device, and the purification efficiency decreases, which cannot meet the pollutant emission reduction needs.
A high-power diesel exhaust gas purification system for inland ships was designed, including a series structure of a temperature regulating device and a exhaust gas treatment device. By adjusting the exhaust gas temperature, each treatment device is at a suitable temperature. The exhaust gas temperature is adjusted by electric heating and water cooling mechanisms to ensure the effective progress of the purification reaction.
It improves exhaust gas purification efficiency, reduces atmospheric pollutant emissions, improves coastal environmental quality, extends the service life of catalysts, and achieves efficient purification without increasing ship energy consumption.
Smart Images
Figure CN223104662U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of exhaust gas treatment for inland river ships, in particular to an exhaust gas purification system for high-power diesel engines of inland river ships. Background Technique
[0002] The power of inland river ships mainly comes from high-power diesel engines. During navigation and berthing, high-power diesel engines of inland river ships will emit air pollutants such as nitrogen oxides (NOx), hydrocarbons (HC), carbon monoxide (CO), and particulate matter (PM). The emissions of these pollutants will cause acid rain pollution, photochemical smog, and haze, posing a great threat to the atmospheric environment and human health.
[0003] Although existing inland river ships are equipped with exhaust gas treatment devices to reduce the emissions of exhaust gas pollutants, due to the low exhaust gas temperature during the cold start stage of high-power diesel engines of inland river ships, the temperature required for conversion by the exhaust gas treatment device cannot be reached, resulting in the difficulty of purifying the pollutants in the exhaust gas.
[0004] At the same time, due to the increase in the exhaust gas temperature after the operation of inland river ships, it will exceed the allowable reaction temperature range of the exhaust gas treatment device, resulting in a decrease in the exhaust gas purification efficiency and being unable to meet the requirements for reducing the emissions of exhaust gas pollutants from inland river ships. Summary of the Utility Model
[0005] The purpose of the utility model is to provide an exhaust gas purification system for high-power diesel engines of inland river ships to solve the problems existing in the above-mentioned related technologies. By adjusting the temperature of the exhaust gas of inland river ships, it is ensured that each exhaust gas treatment device is at an appropriate working temperature, and the exhaust gas purification efficiency is improved.
[0006] To achieve the above purpose, the utility model provides the following solutions:
[0007] The utility model provides a tail gas purification system for a high-power diesel engine of an inland river ship, which comprises a first tail gas pipe, a first tail gas treatment device, a filtering device, a second tail gas pipe and a second tail gas treatment device that are connected in sequence. The inlet of the first tail gas pipe is used for introducing the tail gas of the inland river ship. The first tail gas treatment device is used for removing hydrocarbons and carbon monoxide in the tail gas of the inland river ship. The filtering device is used for removing particulate matters in the tail gas of the inland river ship. The second tail gas treatment device is used for removing nitrogen oxides in the tail gas of the inland river ship. The outlet of the second tail gas treatment device is used for discharging the purified tail gas of the inland river ship. The system further comprises a first temperature regulating device and a second temperature regulating device, which are respectively arranged on the first tail gas pipe and the second tail gas pipe. The first temperature regulating device is used for regulating the temperature in the first tail gas pipe so that the tail gas of the inland river ship introduced into the first tail gas treatment device through the first tail gas pipe undergoes a reaction to remove hydrocarbons and carbon monoxide. The second temperature regulating device is used for regulating the temperature in the second tail gas pipe so that the tail gas of the inland river ship introduced into the second tail gas treatment device through the second tail gas pipe undergoes a reaction to remove nitrogen oxides.
[0008] Preferably, the first tail gas treatment device comprises a diesel engine catalytic oxidizer, the inlet of which is connected to the inlet of the first tail gas pipe, and the outlet of which is connected to the inlet of the filtering device.
[0009] Preferably, the filtering device comprises a diesel particulate filter, the inlet of which is connected to the outlet of the diesel engine catalytic oxidizer, and the outlet of which is connected to the inlet of the second tail gas pipe.
[0010] Preferably, the second tail gas treatment device comprises a selective catalytic reduction reactor and a urea tank. The inlet of the selective catalytic reduction reactor is connected to the outlet of the second tail gas pipe, and the outlet of the selective catalytic reduction reactor is used for discharging the purified tail gas of the inland river ship. A nozzle is arranged on the second tail gas pipe. The inlet of the urea tank is used for introducing urea, and the outlet of the urea tank is connected to the nozzle, which can spray the urea into the second tail gas pipe so that the nitrogen oxides in the tail gas of the inland river ship and the urea undergo a selective catalytic reduction reaction in the selective catalytic reduction reactor.
[0011] Preferably, the first temperature regulating device comprises a first electric heating tape, which is arranged on the first tail gas pipe to heat the tail gas of the inland river ship in the first tail gas pipe.
[0012] Preferably, the first temperature control device further includes a first temperature sensor disposed on the first tail gas pipe for detecting the temperature of the inland river ship exhaust gas in the first tail gas pipe.
[0013] Preferably, the second temperature control device includes a second electric heating tape and a water cooling mechanism. The second electric heating tape is disposed on the second tail gas pipe to heat the inland river ship exhaust gas in the second tail gas pipe. The water cooling mechanism includes a sleeve structure sleeved on the second tail gas pipe, with a water storage space formed between the sleeve structure and the second tail gas pipe. The sleeve structure is provided with a water inlet pipe and a water outlet pipe, both of which are communicated with the water storage space, and a water pump is disposed on the water inlet pipe to form a cooling water circulation in the water storage space, thereby cooling the inland river ship exhaust gas in the second tail gas pipe.
[0014] Preferably, the second temperature control device further includes a second temperature sensor disposed on the second tail gas pipe for detecting the temperature of the inland river ship exhaust gas in the second tail gas pipe.
[0015] Preferably, the water pump is a variable frequency water pump.
[0016] Preferably, the inland river ship high-power diesel engine exhaust gas purification system further includes a controller, and the first electric heating tape, the first temperature sensor, the second electric heating tape, the second temperature sensor, and the motor of the variable frequency water pump are all electrically connected to the controller.
[0017] The utility model achieves the following technical effects compared with the related art:
[0018] The exhaust gas purification system for high-power diesel engines of inland river ships provided by the present utility model includes a first tail gas pipe, a first tail gas treatment device, a filtering device, a second tail gas pipe, and a second tail gas treatment device that are connected in sequence. It also includes a first temperature adjustment device and a second temperature adjustment device. During use, this system is installed on an inland river ship, so that the exhaust gas of the inland river ship enters the first tail gas treatment device through the first tail gas pipe to remove hydrocarbons and carbon monoxide, then enters the filtering device to remove particulate matter, and then enters the second tail gas treatment device through the second tail gas pipe to remove nitrogen oxides, thereby realizing the purification of the exhaust gas of the inland river ship. Moreover, during the above exhaust gas purification process, the temperature in the first tail gas pipe is adjusted by the first temperature adjustment device, so that the exhaust gas of the inland river ship introduced into the first tail gas treatment device through the first tail gas pipe can undergo the reaction of removing hydrocarbons and carbon monoxide. At the same time, the temperature in the second tail gas pipe is adjusted by the second temperature adjustment device, so that the exhaust gas of the inland river ship introduced into the second tail gas treatment device through the second tail gas pipe can undergo the reaction of removing nitrogen oxides. That is, the temperature of the exhaust gas of the inland river ship is adjusted by the first temperature adjustment device and the second temperature adjustment device, ensuring that each tail gas treatment device is at an appropriate working temperature, improving the exhaust gas purification efficiency, reducing the emission of air pollutants, and improving the atmospheric environment along the inland river. Description of the Drawings
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or related technologies, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0020] Figure 1 It is a schematic diagram of the exhaust gas purification system for high-power diesel engines of inland river ships provided by the embodiments of the present utility model.
[0021] In the figure: 1 - first tail gas pipe, 2 - diesel engine catalytic oxidizer, 3 - diesel engine particulate filter, 4 - second tail gas pipe, 5 - selective catalytic reduction reactor, 6 - nozzle, 7 - urea tank, 8 - first electric heating tape, 9 - first temperature sensor, 10 - second electric heating tape, 11 - second temperature sensor, 12 - sleeve structure. Detailed Embodiments
[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.
[0023] The purpose of the present utility model is to provide a tail gas purification system for high-power diesel engines of inland river ships, so as to solve the problems existing in the related technologies. By adjusting the temperature of the tail gas of inland river ships, it is ensured that each tail gas treatment device is at an appropriate working temperature, thereby improving the tail gas purification efficiency.
[0024] In order to make the above-mentioned objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0025] As Figure 1 shown, this embodiment provides a tail gas purification system for high-power diesel engines of inland river ships, which includes a first tail gas pipe 1, a diesel engine catalytic oxidizer 2, a diesel engine particulate filter 3, a second tail gas pipe 4, and a selective catalytic reduction reactor 5 that are connected in sequence. The above components are installed in series, and adjacent components are connected by welding. A nozzle 6 is provided on the second tail gas pipe 4 in this embodiment. The nozzle 6 is connected to a urea tank 7, and the nozzle 6 can spray urea into the second tail gas pipe 4.
[0026] During use, this system is installed on an inland river ship, so that the tail gas of the inland river ship enters the diesel engine catalytic oxidizer 2 (DOC) through the first tail gas pipe 1. Hydrocarbons and carbon monoxide in the tail gas of the inland river ship react in the diesel engine catalytic oxidizer 2 to generate carbon dioxide and water. The tail gas of the inland river ship after removing hydrocarbons and carbon monoxide enters the diesel engine particulate filter 3 (cDPF), and the particulate matter in the tail gas of the inland river ship is captured by the diesel engine particulate filter 3, and the catalytic combustion of soot particles is completed. After the tail gas of the inland river ship after removing particulate matter is mixed with urea through the second tail gas pipe 4, it enters the selective catalytic reduction reactor 5 (SCR), and nitrogen oxides in the tail gas of the inland river ship react with the reducing agent urea in the selective catalytic reduction reactor 5 to generate nitrogen and water, thereby realizing the purification of the tail gas of the inland river ship. The purified tail gas of the inland river ship exits through the outlet of the selective catalytic reduction reactor 5.
[0027] Furthermore, the system further includes a first temperature regulating device and a second temperature regulating device. The first temperature regulating device and the second temperature regulating device are respectively arranged on the first tail gas pipe 1 and the second tail gas pipe 4. The first temperature regulating device is used to adjust the temperature in the first tail gas pipe 1 so that the inland river ship tail gas introduced into the diesel engine catalytic oxidizer 2 through the first tail gas pipe 1 undergoes a reaction to remove hydrocarbons and carbon monoxide. The second temperature regulating device is used to adjust the temperature in the second tail gas pipe 4 so that the inland river ship tail gas introduced into the selective catalytic reduction reactor 5 through the second tail gas pipe 4 undergoes a reaction to remove nitrogen oxides. That is, by adjusting the temperature of the inland river ship tail gas through the first temperature regulating device and the second temperature regulating device, it ensures that each tail gas treatment device is at an appropriate working temperature, improves the tail gas purification efficiency, reduces the emission of air pollutants, and improves the atmospheric environment along the inland river.
[0028] In this embodiment, the first temperature regulating device includes a first electric heating tape 8 and a first temperature sensor 9. The first electric heating tape 8 is arranged on the first tail gas pipe 1 to heat the inland river ship tail gas in the first tail gas pipe 1. The first temperature sensor 9 is arranged on the first tail gas pipe 1, and the first temperature sensor 9 is used to detect the temperature of the inland river ship tail gas in the first tail gas pipe 1.
[0029] In this embodiment, the second temperature regulating device includes a second electric heating tape 10, a water cooling mechanism, and a second temperature sensor 11. The second electric heating tape 10 is arranged on the second tail gas pipe 4 to heat the inland river ship tail gas in the second tail gas pipe 4. The water cooling mechanism includes a sleeve structure 12. The sleeve structure 12 is sleeved on the second tail gas pipe 4 and forms a water storage space with the second tail gas pipe 4. And a water inlet pipe and a water outlet pipe are arranged on the sleeve structure 12. Both the water inlet pipe and the water outlet pipe are communicated with the water storage space, and a water pump is arranged on the water inlet pipe. The water pump in this embodiment is preferably a variable frequency water pump to form a cooling water circulation in the water storage space, thereby cooling the inland river ship tail gas in the second tail gas pipe 4. The second temperature sensor 11 is arranged on the second tail gas pipe 4, and the second temperature sensor 11 is used to detect the temperature of the inland river ship tail gas in the second tail gas pipe 4.
[0030] In this embodiment, the inland river ship high-power diesel engine tail gas purification system further includes a controller. The first electric heating tape 8, the first temperature sensor 9, the second electric heating tape 10, the second temperature sensor 11, and the motor of the variable frequency water pump are all electrically connected to the controller. Specifically, the controller in this embodiment is installed in the ship control room and is powered by shore power or the ship's own generator.
[0031] During use, in the cold start stage of the ship, the exhaust gas temperature of inland river ships is relatively low. At this time, the controller heats the first tail gas pipe 1 and the second tail gas pipe 4 through the first electric heating tape 8 and the second electric heating tape 10 respectively, so that the materials in the first tail gas pipe 1 and the second tail gas pipe 4 are quickly heated up to reach the operating temperature of the diesel engine catalytic oxidizer 2 and the selective catalytic reduction reactor 5; during the ship operation stage, the exhaust gas temperature of inland river ships is relatively high. At this time, the controller calculates the difference between the exhaust gas temperature of the inland river ship in the second tail gas pipe 4 and the operating temperature of the selective catalytic reduction reactor 5, determines the amount of river water (i.e., cooling water amount) entering the casing structure 12, and then adjusts the flow rate of the variable frequency water pump to adjust the river water circulation amount in the casing structure 12, so as to reduce the temperature of the exhaust gas of the inland river ship in the second tail gas pipe 4 to the operating temperature of the selective catalytic reduction reactor 5, ensuring the exhaust gas purification efficiency and extending the service life of the catalyst.
[0032] It should be noted that in this embodiment, a catalytic oxidation monolithic catalyst is installed in the diesel engine catalytic oxidizer 2, a particulate matter trapping monolithic catalyst is installed in the diesel particulate filter 3, and a selective catalytic conversion monolithic catalyst is installed in the selective catalytic reduction reactor 5. The activity and service life of each catalyst can meet the requirements of exhaust gas up-to-standard emission.
[0033] In summary, before the ship departs, the system uses shore power or the ship's own generator to generate electricity, making each exhaust gas treatment device reach the ideal operating temperature, reducing the emissions of exhaust gas pollutants during the cold start of the ship. And during the ship operation, the system uses river water to cool the high-temperature exhaust gas through this system to meet the operating temperature of the selective catalytic reduction reactor 5 and extend the service life of the catalyst, so that the purification effects of the diesel engine catalytic oxidizer 2, the diesel particulate filter 3, and the selective catalytic reduction reactor 5 can all reach more than 90%, greatly improving the exhaust gas purification efficiency and reducing the emissions of air pollutants. At the same time, it will not excessively increase the energy consumption of the ship itself.
[0034] In the present utility model, specific examples are used to elaborate the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.
Claims
1. A high-power diesel engine exhaust gas purification system for inland river ships, characterized in that: It includes a first tail gas pipe, a first tail gas treatment device, a filtering device, a second tail gas pipe, and a second tail gas treatment device that are connected in sequence. The inlet of the first tail gas pipe is used to introduce inland river ship tail gas. The first tail gas treatment device is used to remove hydrocarbons and carbon monoxide from the inland river ship tail gas. The filtering device is used to remove particulate matter from the inland river ship tail gas. The second tail gas treatment device is used to remove nitrogen oxides from the inland river ship tail gas. The outlet of the second tail gas treatment device is used to discharge the purified inland river ship tail gas. It further includes a first temperature regulating device and a second temperature regulating device. The first temperature regulating device and the second temperature regulating device are respectively arranged on the first tail gas pipe and the second tail gas pipe. The first temperature regulating device is used to adjust the temperature in the first tail gas pipe so that the inland river ship tail gas introduced into the first tail gas treatment device through the first tail gas pipe undergoes a reaction to remove hydrocarbons and carbon monoxide. The second temperature regulating device is used to adjust the temperature in the second tail gas pipe so that the inland river ship tail gas introduced into the second tail gas treatment device through the second tail gas pipe undergoes a reaction to remove nitrogen oxides.
2. The high-power diesel engine tail gas purification system for inland river vessels according to claim 1, wherein: The first tail gas treatment device includes a diesel oxidation catalyst. The inlet of the diesel oxidation catalyst is connected to the inlet of the first tail gas pipe, and the outlet of the diesel oxidation catalyst is connected to the inlet of the filtering device.
3. The exhaust gas purification system for high-power diesel engines of inland river vessels according to claim 2, wherein: The filtering device includes a diesel particulate filter. The inlet of the diesel particulate filter is connected to the outlet of the diesel oxidation catalyst, and the outlet of the diesel particulate filter is connected to the inlet of the second tail gas pipe.
4. The exhaust gas purification system for high-power diesel engines of inland river vessels according to claim 1, characterized in that: The second tail gas treatment device includes a selective catalytic reduction reactor and a urea tank. The inlet of the selective catalytic reduction reactor is connected to the outlet of the second tail gas pipe, and the outlet of the selective catalytic reduction reactor is used to discharge the purified inland river ship tail gas. A nozzle is arranged on the second tail gas pipe. The inlet of the urea tank is used to introduce urea, and the outlet of the urea tank is connected to the nozzle. The nozzle can spray the urea into the second tail gas pipe so that the nitrogen oxides in the inland river ship tail gas and the urea undergo a selective catalytic reduction reaction in the selective catalytic reduction reactor.
5. The exhaust gas purification system for high-power diesel engines of inland river vessels according to claim 1, wherein: The first temperature regulating device includes a first electric heating tape. The first electric heating tape is arranged on the first tail gas pipe to heat the inland river ship tail gas in the first tail gas pipe.
6. The exhaust gas purification system for high-power diesel engines of inland river vessels according to claim 5, characterized in that: The first temperature regulating device further includes a first temperature sensor. The first temperature sensor is arranged on the first tail gas pipe. The first temperature sensor is used to detect the temperature of the inland river ship tail gas in the first tail gas pipe.
7. The exhaust gas purification system for high-power diesel engines of inland river vessels according to claim 6, characterized in that: The second temperature control device includes a second electric heating tape and a water cooling mechanism. The second electric heating tape is arranged on the second tail gas pipe to heat the inland river ship tail gas in the second tail gas pipe. The water cooling mechanism includes a sleeve structure which is sleeved on the second tail gas pipe and forms a water storage space between the sleeve structure and the second tail gas pipe. An inlet pipe and an outlet pipe are arranged on the sleeve structure. Both the inlet pipe and the outlet pipe are communicated with the water storage space, and a water pump is arranged on the inlet pipe to form a cooling water circulation in the water storage space, so as to cool the inland river ship tail gas in the second tail gas pipe.
8. The high-power diesel engine exhaust gas purification system for inland river vessels according to claim 7, characterized in that: The second temperature control device further includes a second temperature sensor which is arranged on the second tail gas pipe and is used for detecting the temperature of the inland river ship tail gas in the second tail gas pipe.
9. The exhaust gas purification system for high-power diesel engines of inland river vessels according to claim 8, characterized in that: The water pump is a variable frequency water pump.
10. The exhaust gas purification system for high-power diesel engines of inland river vessels according to claim 9, characterized in that: The inland river ship high-power diesel engine tail gas purification system further includes a controller, and the first electric heating tape, the first temperature sensor, the second electric heating tape, the second temperature sensor and the motor of the variable frequency water pump are all electrically connected to the controller.