SCR injection system of railway internal combustion engine

Abstract

The utility model provides an SCR (Selective Catalytic Reduction) injection system of a railway internal combustion engine, which relates to the technical field of tail gas treatment and comprises a first high-pressure spray gun for spraying atomized urea solution and a first tail gas channel for treating an exhaust port of the engine, the first high-pressure spray gun is arranged in the first tail gas channel; the device is characterized by further comprising a high-pressure gas source supply module used for supplying external high-pressure gas; and the high-pressure air source supply module is communicated with the first high-pressure spray gun through a pipeline. According to the SCR injection system of the railway internal combustion engine, the problem that in the prior art, due to the fact that urea solution injected through a single-path spray gun is poor in atomization effect, the catalytic reaction efficiency of tail gas passing through an SCR carrier is low can be solved, the double-exhaust-channel air-assisted SCR injection system is adopted for an exhaust port of the internal combustion engine of a railway locomotive, and the tail gas treatment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of train exhaust treatment, in particular to an SCR injection system of a railway internal combustion engine. Background Art

[0002] In the railway locomotive industry, fuel trains often produce more NOx, CO / HC and PM substances during railway transportation. If these substances are allowed to be discharged into the air, they will pollute the air. Therefore, the Chinese patent application number 202111455587.1 discloses an exhaust gas purification system for fuel trains, including an intake unit, a catalytic oxidation filter unit, a urea mixing chamber, a catalytic reduction unit and an exhaust unit; its intake unit is directly connected to the exhaust port of the engine, and the exhaust gas discharged from the exhaust port of the engine passes through the intake unit, the catalytic oxidation filter unit, the urea mixing chamber and the catalytic reduction unit in turn, and is finally discharged from the exhaust port. The catalytic oxidation filter unit includes a DOC carrier (diesel catalytic oxidizer) and a DPF carrier (diesel particulate filter), and the catalytic reduction unit includes an SCR carrier (selective catalytic reduction unit); it sets an SCR carrier in the catalytic reduction unit, so that NOx and other nitrogen oxide pollutants emitted from the fuel train can achieve an effective cleaning effect.

[0003] However, the prior art uses a single-channel spray gun to spray a large amount of urea solution into the exhaust gas. When the exhaust gas mixed with the urea solution enters the catalytic reduction unit, the conversion efficiency of NOx in the exhaust gas by the SCR carrier is low due to the poor atomization effect of the urea solution. Utility Model Content

[0004] In view of the above-mentioned problems, the utility model provides an SCR injection system for a railway internal combustion engine, which can solve the problem that the urea solution sprayed by a single-channel spray gun in the prior art has poor atomization effect, thereby causing low efficiency of the catalytic reaction of exhaust gas through the SCR carrier, and realizes the use of a dual exhaust channel air-assisted SCR injection system for the exhaust port of the railway locomotive internal combustion engine, thereby improving the exhaust gas treatment efficiency.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The utility model provides an SCR injection system for a railway internal combustion engine, comprising a first high-pressure spray gun for spraying atomized urea solution and a first exhaust gas channel for treating an engine exhaust port; the first high-pressure spray gun is arranged inside the first exhaust gas channel; and a high-pressure gas source supply module for supplying external high-pressure gas is also included;

[0007] The high-pressure gas source supply module is connected to the first high-pressure spray gun through a pipeline.

[0008] The SCR injection system of the railway internal combustion engine provided by the utility model preferably further comprises a second high-pressure spray gun and a second exhaust gas channel;

[0009] The second high-pressure spray gun is arranged inside the second exhaust gas channel; the high-pressure gas source supply module is connected to the second high-pressure spray gun through a pipeline.

[0010] The SCR injection system of the railway internal combustion engine provided by the utility model preferably further comprises a urea tank, a urea supply module and a urea metering module for controlling the injection of urea solution;

[0011] The urea tank is connected to the urea supply module through a pipeline; the urea supply module is connected to the urea metering module through a pipeline; the urea metering module is connected to the first high-pressure spray gun through a pipeline; the urea metering module is connected to the second high-pressure spray gun through a pipeline.

[0012] The SCR injection system of the railway internal combustion engine provided by the utility model preferably further comprises a urea purge cleaning module for cleaning pipelines and high-pressure spray guns;

[0013] The urea purge cleaning module is connected to the high-pressure air source supply module through a pipeline.

[0014] The SCR injection system of the railway internal combustion engine provided by the utility model, preferably, the first exhaust gas channel and the second exhaust gas channel both include an exhaust pipe, a DPF carrier and an SCR carrier;

[0015] The exhaust gas discharge direction in the exhaust pipe is taken as the direction from front to rear of the exhaust pipe; the DPF carrier and the SCR carrier are placed in the exhaust pipe; the DPF carrier is located in front of the SCR carrier; the first high-pressure spray gun is located between the DPF carrier and the SCR carrier in the first exhaust gas channel; the second high-pressure spray gun is located between the DPF carrier and the SCR carrier in the second exhaust gas channel.

[0016] The SCR injection system of the railway internal combustion engine provided by the utility model preferably further includes a sensor module for collecting data;

[0017] The sensor module includes several temperature sensors, differential pressure sensors and NOx sensors;

[0018] All of the temperature sensors are distributed in the exhaust pipe; all of the temperature sensors are located in front of the DPF carrier; all of the differential pressure sensors are distributed in the pipeline between the urea supply module and the urea metering module; all of the NOx sensors are distributed in the exhaust pipe; all of the NOx sensors are respectively located on the front and rear sides of the SCR carrier.

[0019] The SCR injection system of the railway internal combustion engine provided by the utility model preferably further includes a controller and a locomotive ECU;

[0020] The controller is electrically connected to the urea supply module, the urea metering module, the high-pressure gas source supply module, the urea purge cleaning module and the sensor module;

[0021] The locomotive ECU is electrically connected to the controller.

[0022] The SCR injection system of the railway internal combustion engine provided by the utility model preferably further includes a power module;

[0023] The power module is electrically connected to the controller, the urea supply module, the urea metering module, the high-pressure air source supply module, the urea purge cleaning module, the locomotive ECU and the sensor module.

[0024] The above technical solution has the following advantages or beneficial effects:

[0025] The utility model provides an SCR injection system for a railway internal combustion engine, comprising a first high-pressure spray gun, a first exhaust gas channel and a high-pressure gas source supply module; the urea supply module is controlled by a controller to extract a urea solution from a urea tank, the urea metering module is controlled by the controller to open a metering valve to deliver the urea solution to the first high-pressure spray gun, and at the same time, the controller controls the high-pressure gas source supply module to supply high-pressure gas to the first high-pressure spray gun to assist in atomizing the urea solution in the first high-pressure spray gun, and the atomized urea solution is sprayed by the first high-pressure spray gun in the first exhaust gas channel, so that the urea solution, the exhaust gas and the SCR carrier have a good reaction, and when two exhaust gas channels are used, a dual exhaust channel air-assisted SCR injection system can be used for the exhaust port of a railway locomotive internal combustion engine to improve the exhaust gas treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, but the emphasis is on illustrating the subject matter of the present invention.

[0027] Figure 1 It is a structural schematic diagram of the SCR injection system of the railway internal combustion engine provided in Example 1 of the utility model.

[0028] Figure 2 This is a wireframe diagram of electrical connections of an SCR injection system for a railway internal combustion engine provided in Example 1 of the utility model. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0030] Embodiment 1:

[0031] like Figures 1-2 As shown, an SCR injection system for a railway internal combustion engine provided by Example 1 of the utility model comprises a first high-pressure spray gun 1 for spraying atomized urea solution and a first exhaust gas channel 2 for treating an exhaust port of an engine; the first high-pressure spray gun 1 is arranged inside the first exhaust gas channel 2; and further comprises a high-pressure gas source supply module 3 for supplying external high-pressure gas;

[0032] The high-pressure gas source supply module 3 is connected to the first high-pressure spray gun 1 through a pipeline.

[0033] In the SCR injection system of the railway internal combustion engine provided in Example 1 of the utility model, the urea solution is delivered to the first high-pressure spray gun 1, and at the same time, the high-pressure gas source supply module 3 supplies high-pressure gas to the first high-pressure spray gun 1 to assist in atomizing the urea solution in the first high-pressure spray gun 1. The atomized urea solution is sprayed by the first high-pressure spray gun 1 in the first exhaust gas channel 2, so that the urea solution, the exhaust gas and the catalytic reaction carrier react.

[0034] The SCR injection system of a railway internal combustion engine provided in Example 1 of the utility model comprises a first high-pressure spray gun 1, a first exhaust gas channel 2 and a high-pressure gas source supply module 3; the high-pressure gas source supply module 3 supplies high-pressure gas to the first high-pressure spray gun 1, and the high-pressure gas can assist in atomizing the urea solution in the first high-pressure spray gun 1, so that the first high-pressure spray gun 1 in the first exhaust gas channel 2 sprays the atomized urea solution, and the atomized urea solution can be in good contact with the exhaust gas, and then the catalytic reaction carrier performs a catalytic reaction on it, which can achieve a better improvement in the exhaust gas treatment efficiency.

[0035] The SCR injection system of the railway internal combustion engine provided in Example 1 of the utility model preferably further comprises a second high-pressure spray gun 4 and a second exhaust gas channel 5;

[0036] The second high-pressure spray gun 4 is arranged inside the second exhaust gas channel 5; the high-pressure gas source supply module 3 is connected to the second high-pressure spray gun 4 through a pipeline;

[0037] When exhaust gas is discharged from the fuel locomotive engine, the first exhaust gas channel 2 and the second exhaust gas channel 5 are provided so that the exhaust gas is divided into two paths for simultaneous treatment, thereby improving the efficiency of exhaust gas treatment.

[0038] The SCR injection system for a railway internal combustion engine provided in Example 1 of the utility model preferably further comprises a urea tank 11, a urea supply module 12 and a urea metering module 13 for controlling the injection of a urea solution;

[0039] The urea tank 11 is connected to the urea supply module 12 through a pipeline; the urea supply module 12 is connected to the urea metering module 13 through a pipeline; the urea metering module 13 is connected to the first high-pressure spray gun 1 through a pipeline; the urea metering module 13 is connected to the second high-pressure spray gun 4 through a pipeline;

[0040] The urea supply module 12 extracts urea solution from the urea tank 11 and supplies it to the urea metering module 13 to provide a reducing agent for the catalytic reduction reaction in the exhaust gas treatment.

[0041] The SCR injection system of the railway internal combustion engine provided in Example 1 of the utility model preferably further comprises a urea purge cleaning module 31 for cleaning pipelines and high-pressure spray guns;

[0042] The urea purge cleaning module 31 is connected to the high-pressure gas source supply module 3 through a pipeline; the urea purge cleaning module 31 removes the residual urea solution in the pipeline and the first high-pressure spray gun 1 through high-pressure gas to prevent the residual urea solution from crystallizing and clogging the pipeline and the first high-pressure spray gun 1.

[0043] The SCR injection system of the railway internal combustion engine provided in Example 1 of the utility model, preferably, the first exhaust gas channel 2 and the second exhaust gas channel 5 both include an exhaust pipe 21, a DPF carrier 22 and an SCR carrier 23;

[0044] The exhaust gas discharge direction in the exhaust pipe 21 is taken as the direction from front to rear of the exhaust pipe 21; the DPF carrier 22 and the SCR carrier 23 are placed in the exhaust pipe 21; the DPF carrier 22 is located in front of the SCR carrier 23; the first high-pressure spray gun 1 is located between the DPF carrier 22 and the SCR carrier 23 of the first exhaust gas channel 2; the second high-pressure spray gun 4 is located between the DPF carrier 22 and the SCR carrier 23 of the second exhaust gas channel 5;

[0045] A DPF carrier 22 and an SCR carrier 23 are arranged in the exhaust pipe 21. The DPF carrier 22 reduces the emission of particulate matter in the exhaust gas, and the SCR carrier 23 and the atomized urea solution perform a catalytic reduction reaction on the exhaust gas.

[0046] The SCR injection system of the railway internal combustion engine provided in Example 1 of the utility model preferably further includes a sensor module 6 for collecting data;

[0047] The sensor module 6 includes a plurality of temperature sensors 61, a differential pressure sensor 62 and a NOx sensor 63;

[0048] All temperature sensors 61 are distributed in the exhaust pipe 21; all temperature sensors 61 are located in front of the DPF carrier 22; all differential pressure sensors 62 are distributed in the pipeline between the urea supply module 12 and the urea metering module 13; all NOx sensors 63 are distributed in the exhaust pipe 21; all NOx sensors 63 are respectively located on the front and rear sides of the SCR carrier 23;

[0049] The temperature sensor 61 is used to detect the temperature in the exhaust pipe 21 to prepare for the pressure buildup of the urea pump in the urea supply module 12; the differential pressure sensor 62 is used to detect the differential pressure value in the pipeline to determine whether there is urea solution crystallization in the pipeline; the NOx sensor 63 is placed on the front and rear sides of the SCR carrier 23 to detect the reaction effect of the exhaust gas.

[0050] The SCR injection system of the railway internal combustion engine provided in Embodiment 1 of the present utility model preferably further comprises a controller 7 and a locomotive ECU 8;

[0051] The controller 7 is electrically connected to the urea supply module 12, the urea metering module 13, the high-pressure gas source supply module 3, the urea purge cleaning module 31 and the sensor module 6; the controller 7 controls the operation of the urea supply module 12, the urea metering module 13, the high-pressure gas source supply module 3 and the urea purge cleaning module 31; the sensor module 6 provides data support for the controller 7;

[0052] The locomotive ECU 8 is electrically connected to the controller 7 ; the locomotive ECU 7 can determine whether the locomotive engine is in the starting state. When it is determined that the locomotive engine is in the starting state, the controller 7 controls the urea supply module 21 to start.

[0053] The SCR injection system of the railway internal combustion engine provided in Example 1 of the utility model preferably further includes a power module 9;

[0054] The power module 9 is electrically connected to the controller 7, the urea supply module 12, the urea metering module 13, the high-pressure air source supply module 3, the urea purge cleaning module 31, the locomotive ECU 8 and the sensor module 6; the power module 9 supplies energy to the controller 7, the urea supply module 12, the urea metering module 13, the high-pressure air source supply module 3, the urea purge cleaning module 31, the locomotive ECU 8 and the sensor module 6.

[0055] In summary, the SCR injection system for railway internal combustion engines provided by the utility model can solve the problem that the urea solution sprayed by a single-channel spray gun in the prior art has poor atomization effect, thereby causing low efficiency of the catalytic reaction of exhaust gas through the SCR carrier, and realize the use of a dual exhaust channel air-assisted SCR injection system for the exhaust port of the railway locomotive internal combustion engine, thereby improving the exhaust gas treatment efficiency.

[0056] Those skilled in the art should understand that those skilled in the art can implement the above-mentioned variations by combining the prior art and the above-mentioned embodiments, which will not be described in detail here. Such variations do not affect the essential content of the present utility model, and will not be described in detail here.

[0057] The above describes the preferred embodiments of the utility model. It should be understood that the utility model is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the utility model, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. An SCR injection system for a railway internal combustion engine, comprising a first high-pressure spray gun for spraying atomized urea solution and a first exhaust gas channel for treating an engine exhaust port; the first high-pressure spray gun is arranged inside the first exhaust gas channel; characterized in that, Also included is a high-pressure gas source supply module for supplying external high-pressure gas; The high-pressure gas source supply module is connected to the first high-pressure spray gun through a pipeline.

2. The SCR injection system for a railway internal combustion engine according to claim 1, characterized in that: Also included is a second high pressure spray gun and a second exhaust passage; The second high-pressure spray gun is arranged inside the second exhaust gas channel; the high-pressure gas source supply module is connected to the second high-pressure spray gun through a pipeline.

3. The SCR injection system for a railway internal combustion engine according to claim 2, characterized in that: It also includes a urea tank, a urea supply module and a urea metering module for controlling the injection of urea solution; The urea tank is connected to the urea supply module through a pipeline; the urea supply module is connected to the urea metering module through a pipeline; the urea metering module is connected to the first high-pressure spray gun through a pipeline; the urea metering module is connected to the second high-pressure spray gun through a pipeline.

4. The SCR injection system for a railway internal combustion engine according to claim 3, characterized in that: Also included is a urea purge cleaning module for cleaning lines and high-pressure spray guns; The urea purge cleaning module is connected to the high-pressure air source supply module through a pipeline.

5. The SCR injection system for a railway internal combustion engine according to claim 4, characterized in that: The first exhaust gas channel and the second exhaust gas channel both include an exhaust pipe, a DPF substrate and an SCR substrate; The exhaust gas discharge direction in the exhaust pipe is taken as the direction from front to rear of the exhaust pipe; the DPF carrier and the SCR carrier are placed in the exhaust pipe; the DPF carrier is located in front of the SCR carrier; the first high-pressure spray gun is located between the DPF carrier and the SCR carrier in the first exhaust gas channel; the second high-pressure spray gun is located between the DPF carrier and the SCR carrier in the second exhaust gas channel.

6. The SCR injection system for a railway internal combustion engine according to claim 5, characterized in that: Also included is a sensor module for collecting data; The sensor module includes several temperature sensors, differential pressure sensors and NOx sensors; All of the temperature sensors are distributed in the exhaust pipe; all of the temperature sensors are located in front of the DPF carrier; all of the differential pressure sensors are distributed in the pipeline between the urea supply module and the urea metering module; all of the NOx sensors are distributed in the exhaust pipe; all of the NOx sensors are respectively located on the front and rear sides of the SCR carrier.

7. The SCR injection system for a railway internal combustion engine according to claim 6, characterized in that: It also includes controllers and locomotive ECUs; The controller is electrically connected to the urea supply module, the urea metering module, the high-pressure gas source supply module, the urea purge cleaning module and the sensor module; The locomotive ECU is electrically connected to the controller.

8. The SCR injection system for a railway internal combustion engine according to claim 7, characterized in that: Also includes a power module; The power module is electrically connected to the controller, the urea supply module, the urea metering module, the high-pressure air source supply module, the urea purge cleaning module, the locomotive ECU and the sensor module.

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