CN112746885A - Tail gas purification system and purification method for oil-fired train - Google Patents
Tail gas purification system and purification method for oil-fired train Download PDFInfo
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- CN112746885A CN112746885A CN202110047586.7A CN202110047586A CN112746885A CN 112746885 A CN112746885 A CN 112746885A CN 202110047586 A CN202110047586 A CN 202110047586A CN 112746885 A CN112746885 A CN 112746885A
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- 238000000746 purification Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000007800 oxidant agent Substances 0.000 claims abstract description 36
- 239000013618 particulate matter Substances 0.000 claims abstract description 31
- 230000003197 catalytic effect Effects 0.000 claims abstract description 19
- 239000000295 fuel oil Substances 0.000 claims abstract description 17
- 238000004806 packaging method and process Methods 0.000 claims description 21
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 16
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 66
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 12
- 229910002091 carbon monoxide Inorganic materials 0.000 description 12
- 229930195733 hydrocarbon Natural products 0.000 description 10
- 150000002430 hydrocarbons Chemical class 0.000 description 10
- 239000004215 Carbon black (E152) Substances 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical group [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention relates to the field of fuel train parts, in particular to a tail gas purification system and a purification method for a fuel train, which comprises an exhaust inlet and an exhaust outlet; a main passage, a first bypass and a second bypass are arranged between the exhaust inlet and the exhaust outlet in parallel; wherein, a diesel catalytic oxidizer and a particulate matter oxidizer are arranged in the main passage in sequence; a diesel particulate filter is arranged in the first bypass; the second bypass is a straight-through bypass; and valves are respectively arranged at the inlet end of the main passage, the inlet end of the first bypass and the inlet end of the second bypass. The tail gas purification system for the fuel oil train can be switched among three lines according to the operation condition of the engine, and high-concentration particulate matter tail gas generated when the engine is started is independently treated through the first bypass, so that the period that a main channel is possibly blocked is prolonged, and the overhaul period of the tail gas purification system can be effectively prolonged. The second bypass can better ensure the normal operation of the engine.
Description
Technical Field
The invention relates to the technical field of fuel train parts, in particular to a tail gas purification system and a tail gas purification method for a fuel train.
Background
The oil-fired train is usually driven by a diesel engine, the exhaust emission is large, and particularly when the engine of the oil-fired train is just started, because the optimal combustion condition is not achieved, the fuel is not sufficiently combusted, and the concentration of Particulate Matters (PM) in the exhaust is high.
Tail gas clean system for fuel train among the prior art is the single channel usually, is provided with the purification unit who is used for purifying tail gas in the passageway, and the purification channel of tail gas clean system for fuel train of this kind of structure is blocked up by particulate matter in the tail gas very easily, and the maintenance cycle of tail gas clean system for fuel train is shorter.
Disclosure of Invention
Tail gas clean system for fuel train among the prior art is the single channel usually, is provided with the purification unit who is used for purifying tail gas in the passageway, and the purification channel of tail gas clean system for fuel train of this kind of structure is blocked up by particulate matter in the tail gas very easily, and the maintenance cycle of tail gas clean system for fuel train is shorter. Aiming at the technical problems, the technical scheme provided by the invention is as follows:
the invention provides a tail gas purification system for a fuel oil train, which comprises an exhaust inlet and an exhaust outlet; a main passage, a first bypass and a second bypass are arranged between the exhaust inlet and the exhaust outlet, and the main passage, the first bypass and the second bypass are arranged in parallel; wherein, a diesel catalytic oxidizer and a particulate matter oxidizer are arranged in the main passage in sequence; a diesel particulate filter is arranged in the first bypass; the second bypass is a pass-through bypass; the inlet end of the main passage is provided with a main passage valve; the inlet end of the first bypass is provided with a first bypass valve; and a second bypass valve is arranged at the inlet end of the second bypass.
Further, the main passage valve, the first bypass valve and the second bypass valve are all electrically controlled valves.
Further, the main passage valve, the first bypass valve and the second bypass valve are all electric control butterfly valves.
Further, the main passage comprises an inlet end enclosure, a packaging shell and an outlet end enclosure; the packaging shell is in a hollow cuboid shape; the diesel catalytic oxidizer and the particulate matter oxidizer are both arranged in the inner cavity of the packaging shell; the small opening end of the seal head is communicated with the exhaust inlet, and the large opening end of the seal head is communicated with the packaging shell; the small opening end of the outlet end enclosure is communicated with the exhaust outlet, and the large opening end of the inlet end enclosure is communicated with the packaging shell.
Further, the packaging shell comprises a shell body with an opening at one end and a packaging cover plate; the packaging cover plate can detachably seal the opening of the shell body; the packaging cover plate is provided with a handle, and the handle is located outside the packaging shell.
Furthermore, a reinforcing rib is further arranged on the surface of the packaging cover plate.
Further, the first bypass and the second bypass are respectively positioned at two sides of the main passage; the first bypass and the second bypass form a rectangular structure; the main passage, the first bypass and the second bypass are arranged side by side; the rectangular structure is parallel to the package cover plate.
Further, the first bypass comprises a first bypass main branch, a first bypass branch and a second bypass main branch, wherein the first bypass main branch, the first bypass branch and the second bypass main branch are sequentially communicated; the diesel particulate filter is arranged in each first bypass branch.
The invention also provides a tail gas purification method for the fuel oil train, and the tail gas purification system for the fuel oil train comprises the following steps:
the engine starting mode is as follows: the first bypass valve is opened, the main passage valve is closed, and the second bypass valve is closed;
and (3) normal operation mode of the engine: the main passage valve is opened, the first bypass valve is closed, and the second bypass valve is closed;
an emergency mode: the second bypass valve is opened, the first bypass valve is closed, and the main passage valve is opened or closed.
The invention has the advantages or beneficial effects that:
the tail gas purification system for the fuel oil train can be switched among three lines according to the operation condition of the engine, and high-concentration particulate matter tail gas generated when the engine is started is independently treated through the first bypass, so that the period that a main channel is possibly blocked is greatly prolonged, and the overhaul period of the tail gas purification system for the fuel oil train can be effectively prolonged. Through setting up the second bypass, prevent that the engine exhaust that leads to because of the main access blocks up and is obstructed unable normal operating and unexpected safety problem, can better guarantee the normal operating of engine.
Drawings
The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
Fig. 1 is a schematic top view of an exhaust gas purification system for a fuel-fired train according to embodiment 1;
fig. 2 is a schematic front view of an exhaust gas purification system for a fuel-fired train according to embodiment 1;
fig. 3 is a schematic perspective view of an exhaust gas purification system for a fuel-fired train according to embodiment 1.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As used herein, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the positional or orientational relationship illustrated in the figures to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.
The appearances of the terms first, second, and third, if any, are used for descriptive purposes only and are not intended to be limiting or imply relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical solutions in the embodiments of the present invention are described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without making creative efforts, belong to the protection scope of the invention.
Example 1
Tail gas clean system for fuel train among the prior art is the single channel usually, is provided with the purification unit who is used for purifying tail gas in the passageway, and the purification channel of tail gas clean system for fuel train of this kind of structure is blocked up by particulate matter in the tail gas very easily, and the maintenance cycle of tail gas clean system for fuel train is shorter.
In view of the above technical problems, embodiment 1 provides an exhaust gas purification system 01 for a fuel-fired train, as shown in fig. 1 to 3, including an exhaust inlet 1 and an exhaust outlet 2; a main passage 3, a first bypass 4 and a second bypass 5 are arranged between the exhaust inlet 1 and the exhaust outlet 2, and the main passage 3, the first bypass 4 and the second bypass 5 are arranged in parallel; wherein, a diesel catalytic oxidizer (DOC)30 and a particulate matter oxidizer (POC)31 are arranged in the main passage 3 in sequence; a Diesel Particulate Filter (DPF)40 is arranged in the first bypass 4; the second bypass 5 is a straight-through bypass; the inlet end of the main passage 3 is provided with a main passage valve 001; the inlet end of the first bypass 4 is provided with a first bypass valve 002; the inlet end of the second bypass 5 is provided with a second bypass valve 003.
The particulate matter oxidizer (POC)31 may be replaced by a Diesel Particulate Filter (DPF) and a partial flow particulate trap (PDPF), and a combination of two or more of the particulate matter oxidizer (POC), the Diesel Particulate Filter (DPF), and the partial flow particulate trap (PDPF) may be used.
Note that the main passage valve 001, the first bypass valve 002, and the second bypass valve 003 may be electrically controlled valves or manually controlled valves. The exhaust gas purification system 01 for the fuel oil train provided in embodiment 1 is provided with three channels, and can control the opening and closing states of the main passage valve 001, the first bypass valve 002 and the second bypass valve 003 according to the operation condition of the engine. Specifically, the method comprises the following steps:
engine start mode (within 5-15 s of engine start): the first bypass valve 002 is open, the main passage valve 001 is closed, and the second bypass valve 003 is closed. At this time, the first bypass passage 4 is communicated, and the main passage 3 and the second bypass passage 5 are closed. The tail gas of high-concentration Particulate Matters (PM) directly passes through the first bypass 4 when the fuel train engine is just started, the Particulate Matters (PM) in the tail gas are filtered and captured under the action of the diesel particulate matter filter (DPF)40, the Particulate Matters (PM) in the tail gas can be remarkably reduced, and the filtering effect of the diesel particulate matter filter (DPF)40 can reach more than 85 percent generally. Because the engine starting mode lasts for a short time, the total exhaust emission is small, and main pollutant Particulate Matters (PM) in the exhaust are filtered out, the exhaust emission in the engine starting mode basically cannot cause remarkable air pollution.
And (3) normal operation mode of the engine: the main passage valve 001 is opened, the first bypass valve 002 is closed, and the second bypass valve 003 is closed; at this time, the main passage 3 is communicated, and the first bypass passage 4 and the second bypass passage 5 are closed. When the oil-fired train engine normally operates, the tail gas sequentially flows through a diesel catalytic oxidizer (DOC)30 and a particulate matter oxidizer (POC)31 in the main passage 3, and Hydrocarbon (HC), carbon monoxide (CO) and Particulate Matter (PM) in the tail gas are purified. The exhaust gas is treated by a diesel catalytic oxidizer (DOC)30 and a Particulate Oxidizer (POC)31 in the main passage 3, and the exhaust gas can achieve a good purification effect.
The diesel catalytic oxidizer (DOC)30 generally uses metal or ceramic as a catalyst carrier, and the main active components in the coating are precious metals and rare metals such as platinum group, palladium group, etc. When the exhaust gas passes through the diesel catalytic oxidizer (DOC)30, Hydrocarbons (HC), carbon monoxide (CO), and the like can rapidly chemically react with oxygen in the exhaust gas at a relatively low temperature to generate pollution-free water (H)2O) and carbon dioxide (CO)2) So as to achieve the purpose of purifying HC and CO in the tail gas.
The operating principle of the particulate matter oxidizer (POC)31 is to collect particulate matter and catalytically oxidize the Particulate Matter (PM) at a high temperature (250 ℃ to 500 ℃) of the exhaust gas to achieve the purpose of reducing the Particulate Matter (PM).
Emergency mode (when the main channel 3 is partially or totally blocked): the second bypass valve 003 is opened, the first bypass valve 002 is closed, and the main passage valve 001 is selectively opened or closed. At this time, the second bypass 5 is communicated, the first bypass 4 is closed, and the main passage 3 is communicated or closed. In the emergency mode, the exhaust emission can be realized through the second bypass 5, and the problems of abnormal operation and unexpected safety caused by the obstruction of the engine exhaust due to the blockage of the main channel 3 are prevented. When the main passage 3 is partially or completely blocked, the normal operation of the engine can be ensured through the emergency mode.
The embodiment 1 provides a tail gas clean system 01 for fuel oil train can switch between three circuits according to engine operation condition, and the high concentration particulate matter tail gas that produces when the engine starts carries out the independent processing through first bypass 4 to 3 periods that probably take place to block up of main entrance have been prolonged greatly, and then can effectively prolong the maintenance cycle of tail gas clean system 01 for fuel oil train. By arranging the second bypass 5, the problem that the engine cannot normally operate and is unexpectedly safe due to the fact that exhaust of the engine is blocked due to the blockage of the main passage 3 is solved, and the normal operation of the engine can be better guaranteed.
To facilitate the automatic control of the main passage valve, the first bypass valve and the second bypass valve, as shown in fig. 1 to 3, the main passage valve 001, the first bypass valve 002 and the second bypass valve 003 are all electrically controlled valves. The setting of the electric control valve can realize the automatic control and the remote control of the main passage valve 001, the first bypass valve 002 and the second bypass valve 003 through a driving circuit.
Further, as shown in fig. 1-3, the main passage valve 001, the first bypass valve 002, and the second bypass valve 003 are electrically controlled butterfly valves. The electric control butterfly valve has the advantages of convenience in opening and closing, small fluid resistance, simple structure, small size, light weight and the like, and is suitable for being used as a main passage valve 001, a first bypass valve 002 and a second bypass valve 003 of the tail gas purification system 01 for the fuel oil train.
Further, as shown in fig. 1-3, the main passage 3 includes an inlet seal head 320, a package housing 321, and an outlet seal head 322; the package case 321 is a hollow rectangular parallelepiped; a diesel catalytic oxidizer (DOC)30 and a particulate matter oxidizer (POC)31 are both disposed in the inner cavity of the encapsulating housing 321; the small-mouth end of the inlet end enclosure 320 is communicated with the exhaust inlet 1, and the large-mouth end of the inlet end enclosure 320 is communicated with the packaging shell 321; the small end of the outlet end enclosure 322 is communicated with the exhaust outlet 2, and the large end of the inlet end enclosure 320 is communicated with the packaging shell 321. The installation space of the diesel catalytic oxidizer (DOC)30 and the particulate matter oxidizer (POC)31 is ensured by the encapsulation shell 321, the transition between the encapsulation shell 321 and the exhaust inlet 1 is realized by the inlet end enclosure 320, and the transition between the encapsulation shell 321 and the exhaust outlet 2 is realized by the outlet end enclosure 322.
Further, as shown in fig. 1 to 3, the package housing 321 includes a housing body 3210 with an open end and a package cover 3211; the package cover plate 3211 detachably seals an opening of the housing body 3210; the package cover 3211 is provided with a handle 32110, and a handle 32110 is located outside the package housing 321. The handle 32110 can facilitate the opening and closing operation of the sealing cover 3211, so as to facilitate the placement of the diesel catalytic oxidizer (DOC)30 and the particulate matter oxidizer (POC)31 in the inner cavity of the sealing shell 321, or the removal of the diesel catalytic oxidizer (DOC)30 and the particulate matter oxidizer (POC)31 from the inner cavity of the sealing shell 321.
In order to increase the mechanical strength of the package cover plate, as shown in fig. 1 to 3, a plate surface of the package cover plate 3211 is further provided with a reinforcing rib 32111.
In order to optimize the spatial layout of the exhaust gas purification system for the oil-fired train, further, as shown in fig. 1 to 3, a first bypass 4 and a second bypass 5 are respectively located at both sides of the main passage 3; the first bypass 4 and the second bypass 5 form a rectangular structure; the main passage 3, the first bypass 4 and the second bypass 5 are arranged side by side; the rectangular structure is parallel to the package cover 3211. Through the structure layout, the space integration of the tail gas purification system 01 for the fuel oil train is realized, and the occupied space of the tail gas purification system 01 for the fuel oil train is saved. The package cover plate 3211 is parallel to the rectangular structure, which facilitates the opening and closing operation of the package cover plate 3211.
In order to increase the exhaust gas treatment flux of the first bypass on the premise of not significantly increasing the occupied space of the exhaust gas purification system for the oil-fired train, further, as shown in fig. 1 to 3, the first bypass 4 includes a first bypass main path first 41, two first bypass branch paths 42 and a first bypass main path second 43, which are connected in parallel and are sequentially communicated; a Diesel Particulate Filter (DPF)40 is disposed in each first bypass branch 42. Through the structure, utilize two parallelly connected two way first bypass branch road 42, the multiplication of Diesel Particulate Filter (DPF)40 treatment flux has been realized, first bypass main road 41 simultaneously, first bypass main road two 43, respectively with exhaust inlet 1, exhaust outlet 2 intercommunication, consequently optimized the spatial layout of first bypass 4, under the prerequisite that does not show the occupation space that increases tail gas clean system 01 for the fuel oil train, increase the tail gas treatment flux of first bypass 4, be favorable to prolonging the first bypass 4 maintenance cycle of tail gas clean system 01 for the fuel oil train.
It should be noted that the first bypass 4 may also be composed of a plurality of parallel pipelines, and the plurality of parallel pipelines may be distributed on both sides of the main channel 3, or may be distributed on the same side of the main channel 3. The above scheme belongs to the equivalent structural transformation made by the content of the description and the attached drawings of the invention.
Example 2
the engine starting mode is as follows: the first bypass valve 002 is opened, the main passage valve 001 is closed, and the second bypass valve 003 is closed;
and (3) normal operation mode of the engine: the main passage valve 001 is opened, the first bypass valve 002 is closed, and the second bypass valve 003 is closed;
an emergency mode: the second bypass valve 003 is opened, the first bypass valve 002 is closed, and the main passage valve 001 is opened or closed.
The exhaust gas purification system 01 for the fuel oil train provided in embodiment 1 is provided with three channels, and can control the opening and closing states of the main passage valve 001, the first bypass valve 002 and the second bypass valve 003 according to the operation condition of the engine. Specifically, the method comprises the following steps:
engine start mode (within 5-15 s of engine start): the first bypass valve 002 is open, the main passage valve 001 is closed, and the second bypass valve 003 is closed. At this time, the first bypass passage 4 is communicated, and the main passage 3 and the second bypass passage 5 are closed. The tail gas of high-concentration Particulate Matters (PM) directly passes through the first bypass 4 when the fuel train engine is just started, the Particulate Matters (PM) in the tail gas are filtered and captured under the action of the diesel particulate matter filter (DPF)40, the Particulate Matters (PM) in the tail gas can be remarkably reduced, and the filtering effect of the diesel particulate matter filter (DPF)40 can reach more than 85 percent generally. Because the engine starting mode lasts for a short time, the total exhaust emission is small, and main pollutant Particulate Matters (PM) in the exhaust are filtered out, the exhaust emission in the engine starting mode basically cannot cause remarkable air pollution.
And (3) normal operation mode of the engine: the main passage valve 001 is opened, the first bypass valve 002 is closed, and the second bypass valve 003 is closed; at this time, the main passage 3 is communicated, and the first bypass passage 4 and the second bypass passage 5 are closed. When the oil-fired train engine normally operates, the tail gas sequentially flows through a diesel catalytic oxidizer (DOC)30 and a particulate matter oxidizer (POC)31 in the main passage 3, and Hydrocarbon (HC), carbon monoxide (CO) and Particulate Matter (PM) in the tail gas are purified. The exhaust gas is treated by a diesel catalytic oxidizer (DOC)30 and a Particulate Oxidizer (POC)31 in the main passage 3, and the exhaust gas can achieve a good purification effect.
The diesel catalytic oxidizer (DOC)30 generally uses metal or ceramic as a catalyst carrier, and the main active components in the coating are precious metals and rare metals such as platinum group, palladium group, etc. When the exhaust gas passes through the diesel catalytic oxidizer (DOC)30, Hydrocarbons (HC), carbon monoxide (CO), and the like can rapidly chemically react with oxygen in the exhaust gas at a relatively low temperature to generate pollution-free water (H)2O) and carbon dioxide (CO)2) So as to achieve the purpose of purifying HC and CO in the tail gas.
The particulate matter oxidizer (POC)31 works on the principle that particulate matters are collected and then are treated by high-temperature (250-500 ℃) catalytic oxidation of tail gas, so that the purpose of reducing the Particulate Matters (PM) is achieved.
Emergency mode (when the main channel 3 is partially or totally blocked): the second bypass valve 003 is opened, the first bypass valve 002 is closed, and the main passage valve 001 is selectively opened or closed. At this time, the second bypass 5 is communicated, the first bypass 4 is closed, and the main passage 3 is communicated or closed. In the emergency mode, the exhaust emission can be realized through the second bypass 5, and the problems of abnormal operation and unexpected safety caused by the obstruction of the engine exhaust due to the blockage of the main channel 3 are prevented. When the main passage 3 is partially or completely blocked, the normal operation of the engine can be ensured through the emergency mode.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The tail gas purification system for the oil-fired train is characterized by comprising an exhaust inlet and an exhaust outlet;
a main passage, a first bypass and a second bypass are arranged between the exhaust inlet and the exhaust outlet, and the main passage, the first bypass and the second bypass are arranged in parallel;
wherein, a diesel catalytic oxidizer and a particulate matter oxidizer are arranged in the main passage in sequence;
a diesel particulate filter is arranged in the first bypass;
the second bypass is a pass-through bypass;
the inlet end of the main passage is provided with a main passage valve; the inlet end of the first bypass is provided with a first bypass valve; and a second bypass valve is arranged at the inlet end of the second bypass.
2. The exhaust gas purification system for a fuel-fired train as set forth in claim 1, wherein the main passage valve, the first bypass valve and the second bypass valve are electrically controlled valves.
3. The exhaust gas purification system for a fuel-fired train as set forth in claim 2, wherein the main passage valve, the first bypass valve and the second bypass valve are electrically controlled butterfly valves.
4. The exhaust gas purification system for the oil-fired train as set forth in any one of claims 1 to 3, wherein the main passage includes an inlet head, a packing case and an outlet head;
the packaging shell is in a hollow cuboid shape; the diesel catalytic oxidizer and the particulate matter oxidizer are both arranged in the inner cavity of the packaging shell;
the small opening end of the seal head is communicated with the exhaust inlet, and the large opening end of the seal head is communicated with the packaging shell;
the small opening end of the outlet end enclosure is communicated with the exhaust outlet, and the large opening end of the inlet end enclosure is communicated with the packaging shell.
5. The exhaust gas purification system for the oil-fired train as set forth in claim 4, wherein the package housing includes a housing body having an open end and a package cover plate;
the packaging cover plate can detachably seal the opening of the shell body; the packaging cover plate is provided with a handle, and the handle is located outside the packaging shell.
6. The tail gas purification system for the oil-fired train as claimed in claim 5, wherein a reinforcing rib is further arranged on the plate surface of the packaging cover plate.
7. The exhaust gas purification system for a fuel-fired train as set forth in claim 5, wherein the first bypass and the second bypass are respectively located on both sides of the main passage; the first bypass and the second bypass form a rectangular structure; the main passage, the first bypass and the second bypass are arranged side by side;
the rectangular structure is parallel to the package cover plate.
8. The tail gas purification system for the oil-fired train as claimed in claim 1, wherein the first bypass comprises a first bypass main path I, two first bypass branches and a second bypass main path II which are arranged in parallel and are communicated in sequence;
the diesel particulate filter is arranged in each first bypass branch.
9. A method for purifying exhaust gas for a fuel-oil train, characterized by using the exhaust gas purification system for a fuel-oil train according to any one of claims 1 to 8, comprising:
the engine starting mode is as follows:
the first bypass valve is opened, the main passage valve is closed, and the second bypass valve is closed;
and (3) normal operation mode of the engine:
the main passage valve is opened, the first bypass valve is closed, and the second bypass valve is closed;
an emergency mode:
the second bypass valve is opened, the first bypass valve is closed, and the main passage valve is opened or closed.
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