Tail gas after-treatment device for fuel locomotive

Abstract

The utility model provides a tail gas after-treatment device for a fuel locomotive, which relates to the technical field of tail gas treatment of fuel locomotives and comprises a first gas inlet device, a first CDPF tank and a second CDPF tank, the first gas inlet device is used for leading in tail gas, and cordierite CDPF carriers are packaged in the first CDPF tank and the second CDPF tank. The first air inlet device is positioned between the first CDPF box body and the second CDPF box body; and the first CDPF box body and the second CDPF box body are respectively communicated with the first air inlet device. According to the tail gas aftertreatment device for the fuel locomotive, the problem that the PM treatment efficiency cannot be improved and energy consumption cannot be reduced at the same time in the prior art can be solved, and PM in tail gas of the fuel locomotive can be removed at a low exhaust temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust gas treatment for fuel locomotives, in particular to an exhaust gas post-treatment device for fuel locomotives. Background Art

[0002] When a fuel locomotive is in operation, its engine will produce exhaust gas, which contains many harmful substances, including carbon monoxide CO, nitrogen oxides NOx, hydrocarbons HC and particulate matter PM.

[0003] To this end, Chinese patent application No. 202211422303.3 discloses a post-treatment system for rail locomotives, including an air intake assembly and an exhaust gas treatment assembly; an exhaust gas treatment unit is arranged in the exhaust gas treatment assembly, including a box body arranged on one side of the air intake assembly, a drainage hood installed on the side wall of the box body and connected to two drainage pipes, two flow equalizing plates installed in the drainage hood and opposite to the drainage pipes, a DOC catalytic structure installed in the box body and opposite to the flow equalizing plate, and a POC catalytic structure installed on a support frame; it introduces the exhaust gas into the intake pipe through the air intake assembly, and then introduces it into the exhaust gas treatment unit through the drainage pipe connected to the intake pipe, and oxidizes the exhaust gas through the DOC catalytic structure and the POC catalytic structure in the exhaust gas treatment device to remove CO, HC and PM in the exhaust gas.

[0004] The Chinese patent application number 202111562221.4 discloses a new exhaust gas purification device system for a fuel train, which is provided with a main purification unit and an auxiliary purification unit; the DOC carrier unit and the POC carrier unit are sequentially encapsulated in the main purification unit along the exhaust gas flow direction; the DPF carrier unit is encapsulated in the auxiliary purification unit; the main purification unit and the auxiliary purification unit jointly realize the cleaning of the exhaust gas.

[0005] However, the DOC carrier and POC carrier used in the existing technology cannot effectively remove PM in the exhaust gas of fuel locomotives, while the use of DPF carrier to treat PM in the exhaust gas of fuel locomotives requires a lot of energy to increase the temperature of the DPF carrier, and it is impossible to strike a balance between effectively improving the PM treatment efficiency and energy consumption. Utility Model Content

[0006] In response to the above-mentioned problems, the utility model provides an exhaust gas after-treatment device for a fuel locomotive, which can solve the problem that the prior art cannot simultaneously improve PM treatment efficiency and reduce energy consumption, and achieve the removal of PM in the exhaust gas of a fuel locomotive at a lower exhaust temperature.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] The utility model provides an exhaust gas after-treatment device for a fuel locomotive, comprising a first air intake device for introducing exhaust gas, a first CDPF box encapsulating a cordierite CDPF carrier, and a second CDPF box; the first air intake device is located between the first CDPF box and the second CDPF box; the first CDPF box and the second CDPF box are respectively connected to the first air intake device.

[0009] The exhaust gas after-treatment device for a fuel locomotive provided by the utility model preferably further comprises a second air intake device and a third CDPF box;

[0010] The second air intake device is placed in parallel with the first air intake device; the third CDPF box is placed in parallel with the second CDPF box; the second air intake device is connected to the first CDPF box and the third CDPF box.

[0011] The exhaust gas after-treatment device for a fuel locomotive provided by the utility model, preferably, the first air intake device and the second air intake device each include an air intake port connected to the engine exhaust port, a bypass valve for manual exhaust and two air vents;

[0012] The bypass valve is located at the top of the first air intake device and the second air intake device; the air intake is located at the bottom of the first air intake device and the second air intake device; the air vent is located at both sides of the first air intake device and the second air intake device;

[0013] The vent on one side of the first air intake device is connected to the first CDPF case through a bellows; the vent on the other side of the first air intake device is connected to the second CDPF case through a bellows; the vent on one side of the second air intake device is connected to the first CDPF case through a bellows; the vent on the other side of the second air intake device is connected to the third CDPF case through a bellows.

[0014] The utility model provides an exhaust gas after-treatment device for a fuel locomotive, preferably, a first chimney for ensuring exhaust is arranged above the bypass valve; two first chimneys are respectively fixed to the tops of the first air intake device and the second air intake device; a first rain cap for preventing rainwater from flowing back is arranged around the first chimney; the first rain cap is fixed to the first chimney; the bypass valve is connected to the first chimney; the first rain cap is located below the first chimney.

[0015] The exhaust gas after-treatment device for a fuel locomotive provided by the utility model is preferably provided with a plurality of cleaning ports for cleaning PM ash on the first CDPF box, the second CDPF box and the third CDPF box.

[0016] The exhaust gas after-treatment device for a fuel locomotive provided by the utility model is preferably provided with a pressure difference sensor for detecting the filtering efficiency on the first CDPF box, the second CDPF box and the third CDPF box.

[0017] The exhaust gas after-treatment device for a fuel locomotive provided by the utility model is preferably provided with a fixed bracket between the second CDPF box and the third CDPF box; the fixed bracket is fixed to the second CDPF box; the fixed bracket is fixed to the third CDPF box.

[0018] The utility model provides an exhaust gas after-treatment device for a fuel locomotive, preferably, the tops of the first CDPF box, the second CDPF box and the third CDPF box are all provided with a detachable exhaust end cone assembly for replacing the cordierite CDPF carrier inside the box.

[0019] The utility model provides an exhaust gas after-treatment device for a fuel locomotive, preferably, a second chimney is arranged above the detachable exhaust end cone assembly; the second chimney is fixed to the top of the detachable exhaust end cone assembly; the second chimney is connected to the exhaust port of the detachable exhaust end cone assembly; a second rain cap is fixed around the second chimney; the second rain cap is located below the second chimney.

[0020] The above technical solution has the following advantages or beneficial effects:

[0021] The utility model provides an exhaust gas post-treatment device for a fuel locomotive, comprising a first air intake device for introducing exhaust gas, a first CDPF box body and a second CDPF box body encapsulating a cordierite CDPF carrier; the first air intake device is located between the first CDPF box body and the second CDPF box body; the first CDPF box body and the second CDPF box body are respectively connected to the first air intake device. When the exhaust gas generated during the operation of the locomotive engine enters from the first air intake device, the PM in the exhaust gas is cleaned simultaneously by the first CDPF box body and the second CDPF box body on the left and right sides of the first air intake device, thereby improving the treatment efficiency of the PM in the exhaust gas; at the same time, the use of the cordierite CDPF carrier can ignite the PM in the carrier at a lower exhaust temperature, which reduces the required additional energy consumption compared to the use of the DPF carrier, and can more effectively reduce the PM content of the fuel locomotive after exhaust gas treatment compared to the prior art of using the DOC carrier and the POC carrier to treat the PM generated by the fuel locomotive. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the exhaust gas after-treatment device for fuel locomotives provided in Example 1 of the utility model.

[0024] Figure 2 It is a schematic diagram of the top view of the exhaust gas after-treatment device for fuel locomotives provided in Example 1 of the utility model.

[0025] Figure 3 It is a structural schematic diagram of a detachable exhaust end cone assembly of an exhaust gas after-treatment device for a fuel locomotive provided in Example 1 of the utility model.

[0026] Figure 4 It is a side structural schematic diagram of an exhaust gas after-treatment device for a fuel locomotive provided in Example 1 of the utility model. DETAILED DESCRIPTION

[0027] 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.

[0028] Embodiment 1:

[0029] like Figures 1 to 4 As shown, an exhaust gas after-treatment device for a fuel locomotive provided in Example 1 of the utility model includes a first air intake device 11 for introducing exhaust gas, a first CDPF box 21 and a second CDPF box 22 encapsulating a cordierite CDPF carrier; the first air intake device 11 is located between the first CDPF box 21 and the second CDPF box 22; the first CDPF box 21 and the second CDPF box 22 are respectively connected to the first air intake device 11.

[0030] When the exhaust gas after-treatment device for a fuel locomotive provided in Example 1 of the utility model is used, the exhaust port of the fuel locomotive engine is connected to the first air intake device 11; when the engine of the fuel locomotive is started, the exhaust gas generated by it is discharged from the exhaust port of the engine and enters the first air intake device 11, and the exhaust gas is then discharged from the first air intake device 11 to the first CDPF box 21 and the second CDPF box 22 on both sides of the first air intake device 11. The PM in the exhaust gas passes through the first CDPF box 21 and the second CDPF box 22 encapsulated with cordierite CDPF carriers, and the cordierite CDPF carriers in the first CDPF box 21 and the second CDPF box 22 remove the PM in the exhaust gas.

[0031] The exhaust gas after-treatment device for a fuel locomotive provided in Example 1 of the utility model comprises a first air intake device 11 for introducing exhaust gas, a first CDPF box 21 and a second CDPF box 22 encapsulating a cordierite CDPF carrier; the first air intake device 11 is located between the first CDPF box 21 and the second CDPF box 22; the first CDPF box 21 and the second CDPF box 22 are respectively connected to the first air intake device 11; after the exhaust gas of the fuel locomotive enters through the first air intake device 11, the first CDPF box 21 and the second CDPF box 22 connected to the first air intake device 11 process the PM in the exhaust gas, thereby realizing PM treatment of the exhaust gas generated by the fuel locomotive engine; the first CDPF box 21 and the second CDPF box 22 are both encapsulated with a cordierite CDPF carrier, and the cordierite CDPF carrier is relatively The DPF carrier commonly used in the prior art has the ability to reduce the combustion conditions of PM, so that it has the advantage of reducing the energy consumption required to burn PM. Compared with the prior art that uses DOC carriers and POC carriers to treat PM, the cordierite CDPF carrier has a better treatment effect on PM, achieving both improved PM treatment efficiency and reduced energy consumption; the first CDPF box 21 and the second CDPF box 22 are distributed on both sides of the first air intake device 11. When the exhaust gas emitted by the fuel locomotive engine enters the first CDPF box 21 and the second CDPF box 22 from the first air intake device 11, the exhaust gas flows from the first air intake device 11 to the left and right sides of the first air intake device 11 respectively, and the cordierite CDPF carriers in the first CDPF box 21 and the second CDPF box 22 simultaneously treat the exhaust gas, thereby improving the exhaust gas treatment efficiency.

[0032] The exhaust gas post-treatment device for a fuel locomotive provided in Example 1 of the utility model preferably further includes a second air intake device 12 and a third CDPF box 23;

[0033] The second air intake device 12 is placed in parallel with the first air intake device 11; the third CDPF box 23 is placed in parallel with the second CDPF box 22; the second air intake device 12 is connected to the first CDPF box 21 and the third CDPF box;

[0034] When the exhaust gas enters the CDPF box through the first air intake device 11 and the second air intake device 12, the exhaust gas moves from the first air intake device 11 to the first CDPF box 21 and the second CDPF box 22 respectively, and at the same time, part of the exhaust gas moves from the second air intake device 12 to the first CDPF box 21 and the third CDPF box 23 respectively, so that the exhaust gas can be processed at multiple locations at the same time, thereby improving the exhaust gas processing efficiency.

[0035] The exhaust gas after-treatment device for a fuel locomotive provided in Example 1 of the utility model, preferably, the first air intake device 11 and the second air intake device 12 each include an air intake port 101 for connecting to the exhaust port of the engine, a bypass valve 102 for manual exhaust and two vents;

[0036] The bypass valve 102 is located at the top of the first air intake device 11 and the second air intake device 12; the air intake port 101 is located at the bottom of the first air intake device 11 and the second air intake device 12; the air vents are located at both sides of the first air intake device 11 and the second air intake device 12;

[0037] The vent on one side of the first air intake device 11 is connected to the first CDPF box 21 through a bellows; the vent on the other side of the first air intake device 11 is connected to the second CDPF box 22 through a bellows; the vent on one side of the second air intake device 12 is connected to the first CDPF box 21 through a bellows; the vent on the other side of the second air intake device 12 is connected to the third CDPF box 23 through a bellows;

[0038] The air inlets 101 of the first air inlet device 11 and the second air inlet device 12 are respectively connected to the two exhaust ports of the fuel locomotive engine. The exhaust gas generated by the fuel locomotive engine enters the first air inlet device 11 and the second air inlet device 12 from the air inlet 101 respectively. Since the temperature of the exhaust gas discharged by the fuel locomotive engine is relatively high, the exhaust gas enters from the bottom of the first air inlet device 11 and the second air inlet device 12, and the exhaust gas will move to the top of the first air inlet device 11 and the second air inlet device 12; when the fuel locomotive engine continuously discharges the exhaust gas, the air inlet device will produce pressure buildup, and a bypass valve 102 is set at the top of the first air inlet device 11 and the second air inlet device 12. Manually opening the bypass valves 102 of the two air inlet devices can allow the exhaust gas to be partially discharged from the bypass valve 102; using a bellows to connect the CDPF box and the air inlet device can balance the processing error. The bellows can balance and eliminate most of the vibrations and stresses caused by the operation of the fuel locomotive engine, thereby extending the service and maintenance cycle of the exhaust gas after-treatment device.

[0039] The exhaust gas after-treatment device for a fuel locomotive provided in Example 1 of the utility model is preferably provided with a first chimney 1021 for ensuring exhaust gas above the bypass valve 102; the two first chimneys 1021 are respectively fixed to the tops of the first air intake device 11 and the second air intake device 12; a first rain cap 1022 for preventing rainwater from flowing back is provided around the first chimney 1021; the first rain cap 1022 is fixed to the first chimney 1021; the bypass valve 102 is connected to the first chimney 1021; the first rain cap 1022 is located below the first chimney 1021;

[0040] When the bypass valve 102 is opened, in order to ensure that the exhaust gas can be smoothly discharged from the first air intake device 11 and the second air intake device 12, a first chimney 1021 is placed on the bypass valve 102, and the exhaust gas is discharged into the atmosphere from the first chimney 1021; a first rain cap 1022 is arranged around the first chimney 1021, and the first rain cap 1022 can protect the air intake device from working safely when the bypass valve 102 is in the open state, and prevent rainwater from entering the first air intake device 11 and the second air intake device 12 from the bypass valve 102.

[0041] The exhaust gas after-treatment device for a fuel locomotive provided in Example 1 of the utility model is preferably provided with a plurality of cleaning ports 201 for cleaning PM ash on the first CDPF box 21, the second CDPF box 22 and the third CDPF box 23; the cleaning ports 201 facilitate the maintenance of the cordierite CDPF carrier in the CDPF box, remove the dust in the cordierite CDPF carrier, and observe the use of the cordierite CDPF carrier in the CDPF box.

[0042] The exhaust gas after-treatment device for a fuel locomotive provided in Example 1 of the utility model is preferably provided with a pressure difference sensor 202 for detecting the filtering efficiency on the first CDPF box 21, the second CDPF box 22 and the third CDPF box 23; the pressure difference sensor 202 is used to monitor the efficiency of filtering exhaust gas by the cordierite CDPF carrier in the CDPF box.

[0043] The exhaust gas after-treatment device for a fuel locomotive provided in Example 1 of the utility model is preferably provided with a fixing bracket 203 between the second CDPF box 22 and the third CDPF box 23; the fixing bracket 203 is fixed to the second CDPF box 22; the fixing bracket 203 is fixed to the third CDPF box 23; the fixing bracket 203 is provided between the second CDPF box 22 and the third CDPF box 23, so that a pulling force is formed between the second CDPF box 22 and the third CDPF box 23 to prevent the parallel second CDPF box 22 or the third CDPF box 23 from falling off during the operation of the fuel locomotive, thereby affecting the exhaust gas treatment efficiency.

[0044] The exhaust gas after-treatment device for fuel locomotives provided in Example 1 of the utility model is preferably provided with a detachable exhaust end cone assembly 204 for replacing the cordierite CDPF carrier inside the box on the top of the first CDPF box 21, the second CDPF box 22 and the third CDPF box 23; the detachable exhaust end cone assembly 204 arranged on the top of the first CDPF box 21, the second CDPF box 22 and the third CDPF box 23 can discharge the filtered exhaust gas in the CDPF box, and at the same time, the cordierite CDPF carrier can be replaced separately after the end of its service life, thereby extending the service life of the exhaust gas after-treatment device of the fuel locomotive.

[0045] The exhaust gas after-treatment device for a fuel locomotive provided in Example 1 of the utility model is preferably provided with a second chimney 205 above the detachable exhaust end cone assembly 204; the second chimney 205 is fixed to the top of the detachable exhaust end cone assembly 204; the second chimney 205 is connected to the exhaust port of the detachable exhaust end cone assembly 204; a second rain cap 206 is fixed around the second chimney 205; the second rain cap 206 is located below the second chimney 205;

[0046] After the exhaust gas is treated by the first CDPF box 21, the second CDPF box 22 and the third CDPF box 23, the treated exhaust gas is discharged from the detachable exhaust end cone assembly 204 on the top of the CDPF box. A second chimney 205 is set above the detachable exhaust end cone assembly 204 on the top of the CDPF box, so that the treated exhaust gas is discharged into the atmosphere from the second chimney 205, thereby reducing the back pressure in the CDPF box; the second rain cap 206 can prevent rainwater from entering the box 21 from the air outlet of the detachable exhaust end cone assembly 204 above the CDPF box, thereby reducing the impact of rainwater on the exhaust gas treatment inside the CDPF box.

[0047] In summary, the exhaust gas after-treatment device for fuel locomotives provided by the utility model can solve the problem that the prior art cannot simultaneously improve PM treatment efficiency and reduce energy consumption, and achieve the removal of PM in the exhaust gas of fuel locomotives at a lower exhaust temperature.

[0048] 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.

[0049] 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 exhaust gas post-treatment device for a fuel locomotive, characterized in that: It includes a first air intake device for introducing exhaust gas, a first CDPF box encapsulating a cordierite CDPF carrier, and a second CDPF box; the first air intake device is located between the first CDPF box and the second CDPF box; the first CDPF box and the second CDPF box are respectively connected to the first air intake device.

2. The exhaust gas post-treatment device for a fuel locomotive according to claim 1, characterized in that: Also includes a second air intake device and a third CDPF box; The second air intake device is placed in parallel with the first air intake device; the third CDPF box is placed in parallel with the second CDPF box; the second air intake device is connected to the first CDPF box and the third CDPF box.

3. The exhaust gas post-treatment device for a fuel locomotive according to claim 2, characterized in that: The first air intake device and the second air intake device each include an air intake port for connecting to an exhaust port of an engine, a bypass valve for manual exhaust, and two air vents; The bypass valve is located at the top of the first air intake device and the second air intake device; the air intake is located at the bottom of the first air intake device and the second air intake device; the air vent is located at both sides of the first air intake device and the second air intake device; The vent on one side of the first air intake device is connected to the first CDPF case through a bellows; the vent on the other side of the first air intake device is connected to the second CDPF case through a bellows; the vent on one side of the second air intake device is connected to the first CDPF case through a bellows; the vent on the other side of the second air intake device is connected to the third CDPF case through a bellows.

4. The exhaust gas post-treatment device for a fuel locomotive as claimed in claim 3, characterized in that: A first chimney for ensuring exhaust is arranged above the bypass valve; two first chimneys are respectively fixed on the top of the first air intake device and the second air intake device; a first rain cap for preventing rainwater from flowing back is arranged around the first chimney; the first rain cap is fixed to the first chimney; the bypass valve is connected to the first chimney; the first rain cap is located below the first chimney.

5. The exhaust gas post-treatment device for a fuel locomotive as claimed in claim 2, characterized in that: The first CDPF box, the second CDPF box and the third CDPF box are all provided with a plurality of cleaning ports for cleaning PM ash.

6. The exhaust gas post-treatment device for a fuel locomotive as claimed in claim 2, characterized in that: The first CDPF housing, the second CDPF housing and the third CDPF housing are all provided with a differential pressure sensor for detecting filtering efficiency.

7. The exhaust gas post-treatment device for a fuel locomotive as claimed in claim 2, characterized in that: A fixing bracket is provided between the second CDPF box and the third CDPF box; the fixing bracket is fixed to the second CDPF box; and the fixing bracket is fixed to the third CDPF box.

8. The exhaust gas post-treatment device for a fuel locomotive as claimed in claim 2, characterized in that: The tops of the first CDPF housing, the second CDPF housing and the third CDPF housing are all provided with a detachable exhaust end cone assembly for replacing the cordierite CDPF carrier inside the housing.

9. The exhaust gas post-treatment device for a fuel locomotive according to claim 8, characterized in that: A second chimney is arranged above the detachable exhaust end cone assembly; the second chimney is fixed to the top of the detachable exhaust end cone assembly; the second chimney is connected to the exhaust port of the detachable exhaust end cone assembly; a second rain cap is fixed around the second chimney; the second rain cap is located below the second chimney.

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