CN210105952U - Tail gas purification device for railway engineering machinery engine - Google Patents
Tail gas purification device for railway engineering machinery engine Download PDFInfo
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- CN210105952U CN210105952U CN201920549020.2U CN201920549020U CN210105952U CN 210105952 U CN210105952 U CN 210105952U CN 201920549020 U CN201920549020 U CN 201920549020U CN 210105952 U CN210105952 U CN 210105952U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The utility model discloses a railway engineering machinery engine tail gas cleanup unit, include: a tail gas inlet pipe; the mixer is used for mixing the ammonia gas and the tail gas entering the system; a selective catalytic reduction reactor (SCR) for catalyzing the reaction of nitrogen oxides and ammonia; a catalytic oxidation converter (DOC) for completely oxidizing incompletely combusted hydrocarbons and carbon monoxide of the engine; a catalyzed particle trap (POC) for trapping larger particulate contaminants; a PLC controller; the tail gas inlet pipe, the mixer, the selective catalytic reduction reactor, the catalytic oxidation converter and the catalytic particle catcher are connected through flanges. The utility model has the advantages that: by adopting the SCR + DOC + POC triple tail gas post-treatment device, the emission of nitrogen oxides, hydrocarbons, carbon monoxide and particulate pollutants of the railway engineering machinery engine can be effectively reduced, and the tail gas emission performance is improved.
Description
Technical Field
The utility model relates to a railway engineering machinery engine tail gas cleanup unit particularly, relates to one kind and can carry out purification treatment's device to railway diesel engine exhaust after starting under true operating mode.
Background
Diesel engines have high thermal efficiency and fuel economy, but diffusion combustion of diesel has a problem of non-uniform concentration of mixed gas, black char is easily produced, and high-temperature and oxygen-rich combustion conditions also increase the NOx emission concentration of diesel engines (guo, xu-lim, zhuojun, automobile exhaust gas purification processing technology [ M ]. beijing: mechanical industry press, 2018: 4). In addition, a portion of the CO and hydrocarbons may be emitted. How to solve the tailpipe emission problem of NOx, CO, hydrocarbons and particulate matters of diesel vehicles with emphasis on ensuring economy has become the leading work of diesel emission control technology in recent years.
Selective catalytic oxidation (CR) has the advantages of simple device, high removal efficiency, and the like, and is the mainstream method for removing NOx from diesel engine exhaust at present. The SCR process uses ammonia (NH 3) as a reductant to convert NOx into harmless nitrogen and water through a catalytic process. The SCR catalyst is typically made of titanium dioxide (TiO)2) As carrier, vanadium (V) oxide2O5) Is a main active component, and is added with an auxiliary agent such as WO3 or MoO3 and the like.
An Oxidation-type catalytic converter (DOC) is formed by coating a noble metal Catalyst (Pt, Pd, etc.) on a honeycomb ceramic carrier or a honeycomb metal carrier to reduce the chemical reaction activation energy of hydrocarbons, CO, and soluble organic matters in particulate matters in Diesel engine exhaust, and reacting with oxygen to convert the hydrocarbons, CO, and soluble organic matters into carbon dioxide and water.
A catalytic Particle trap (POC) is formed by coating a precious metal Catalyst (Pt, Pb, Rh and the like) on a Diesel Particle trap (DPF) carrier, can effectively reduce the ignition temperature of Particulate Matters (PM), and can realize the catalytic regeneration of the Particle trap (strong potential difference, strong peak, far-end calamity, and the like) within the exhaust temperature range of 250-500 ℃ when a Diesel engine normally works [ J ] the influence of DOC + CDPF on the emission characteristics of biodiesel combustion particles [ J ] Chinese environmental science 2015, 35(10): 2978-. The most successful diesel particulate trap at present is the wall-flow trap, and POC is one of the most effective methods recognized for purifying diesel particulate emissions.
The existing tail gas purification SCR + DOC + POC device is mature installed and applied on a diesel engine vehicle. However, the tail gas purification treatment device for the large diesel engine of the railway has various problems, and when the device is operated in closed spaces such as a tunnel and the like, the emission of the tail gas can seriously affect the operation environment and harm the health of workers.
The existing tail gas treatment device for the large railway engine and diesel engine mainly has the following problems:
(1) only the oxidation-type catalytic converter and the particulate matter trap are installed. The oxidation type catalytic converter and the particulate matter trap only have certain capability of eliminating hydrocarbon, CO, particulate matters and black smoke in the tail gas. Since no selective catalytic oxidation-reduction device is installed, nitrogen oxides in the exhaust gas cannot be eliminated.
(2) And a tail gas heating system is not provided. The temperature required by the SCR catalyst is 250-400 ℃, and the temperature required by the DOC + POC catalyst is more than 300 ℃. The temperature required by the catalyst is difficult to meet due to the lower temperature of the tail gas of the large railway engine. The heating system utilizes the ignition device to burn fuel oil, so that the temperature of tail gas is rapidly increased to reach the temperature required by the catalyst of the whole device.
(3) Without a monitoring system. The activity and the backpressure of the catalyst of the device can not be effectively monitored in time, and the performance of the large-scale railway engine is seriously influenced.
Disclosure of Invention
The utility model aims at providing a railway engineering machinery engine tail gas cleanup unit can overcome prior art's weak point, carries out purification treatment to the big quick-witted tail gas of railway diesel under true operating mode.
The utility model discloses a railway engineering machinery engine tail gas cleanup unit, a serial communication port, include:
a tail gas inlet pipe;
the mixer is used for mixing the ammonia gas and the tail gas entering the system;
the selective catalytic reduction reactor (SCR) is used for catalyzing the reaction of nitrogen oxides and ammonia gas and improving the reaction efficiency;
a catalytic oxidation converter (DOC) for completely oxidizing incompletely combusted hydrocarbons and carbon monoxide of a combustion engine;
a catalyzed particle trap (POC) for trapping larger particulate contaminants;
a PLC controller;
the tail gas inlet pipe, the mixer, the selective catalytic reduction reactor, the catalytic oxidation converter and the catalytic particle catcher are connected through flanges.
Preferably, the apparatus further comprises an exhaust gas heating system comprising: oil tank, oil pump and ignition ware, tail gas heating system and tail gas intake-tube connection for the compensation of tail gas temperature.
Preferably, the apparatus further comprises a urea spraying system comprising: the device comprises a urea solution tank, a urea solution pneumatic pump and a urea solution nozzle, wherein the urea solution spraying system is connected with a mixer and used for providing ammonia gas required by the tail gas treatment process.
Further preferably, the apparatus further comprises a control and monitoring system comprising:
the temperature sensors are respectively arranged on the tail gas inlet pipe, the selective catalytic reduction reactor and the catalytic filter trap and are used for detecting the temperature;
at least one pressure sensor arranged on the catalytic oxidation converter;
the NOx sensors are respectively arranged on the tail gas inlet pipe and the selective catalytic reduction reactor;
a data display;
the control monitoring system is connected with the PLC, and the PLC acquires data of the temperature sensor, the pressure sensor and the NOx sensor and displays the data on the data display on line.
Preferably, the selective catalytic reduction reactor is a cylindrical barrel made of a stainless steel material, and a honeycomb-shaped vanadium-based catalyst is filled therein.
Further preferably, the temperature of the tail gas inlet pipe is 100-400 ℃.
Compared with the prior art, the utility model discloses a big quick-witted tail gas cleanup unit of railway diesel oil has following apparent advantage:
adopting a three-stage purification treatment technology: the first stage is a selective catalytic reduction technology, which effectively removes NO in tail gasxA contaminant; the second stage is a catalytic oxidation combustion technology which effectively oxidizes hydrocarbon, CO and partial particles; the third level is a catalytic particle filtering and trapping technology, and particulate matters are effectively filtered and removed.
The front and the rear parts of each section of reaction tube are provided with sensors connected to an online analysis system (PLC) for online analysis of nitrogen oxide concentration, real-time tail gas temperature and backpressure value.
PLC controller passing NOxThe sensors and the temperature sensors feed back signals to accurately adjust the spraying amount of the urea solution and effectively remove nitrogen oxides.
The remote monitoring system is arranged, so that data and debugging parameter values can be remotely checked in real time.
Drawings
Fig. 1 is a schematic structural diagram of the tail gas purification device of the railway engineering machinery engine of the present invention.
In the figure: 1-tail gas inlet pipe; 2-a mixer; 3-a selective catalytic reduction reactor; 4-a catalytic oxidation converter; 5-catalytic filter trap; 6-a chimney; 7-a PLC controller; 8-a data display; 9-an oil tank; 10-an oil pump; 11-ureaA solution tank; 12-urea solution pneumatic pump; 13a, 13b, 13 c-temperature sensors; 14a, 14b-NOxA sensor; 15-an igniter; a 16-urea solution nozzle; 17-a pressure sensor; 18-flange.
Fig. 2 is a schematic flow chart of a tail gas purification control system of an engine of a railway engineering machine provided by an embodiment of the utility model.
Detailed Description
Fig. 1 is a schematic structural diagram of a tail gas purification device of an engine of a railway engineering machine provided by an embodiment of the utility model.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are only some embodiments, not all embodiments, of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
The utility model discloses a railway engineering machinery engine tail gas cleanup unit, include:
an exhaust gas inlet pipe 1;
the mixer 2 is used for mixing ammonia gas and tail gas entering the system;
the selective catalytic reduction reactor 3 is used for catalyzing the reaction of nitrogen oxides and ammonia gas and improving the reaction efficiency;
a catalytic oxidation converter 4 for completely oxidizing hydrocarbons and carbon monoxide that are not completely combusted by the combustion engine;
the catalytic particle trap 5 is wall-flow type filtering and trapping ceramic rich in catalyst, and has the structure with the function of filtering and trapping larger particle pollutants;
a PLC controller 7;
the tail gas inlet pipe 1, the mixer 2, the selective catalytic reduction reactor 3, the catalytic oxidation converter 4 and the catalytic type particle catcher 5 are connected through flanges 18, but the front and rear sequence of the tail gas inlet pipe is not specifically limited.
The device still includes the tail gas heating system, including oil tank 9, oil pump 10 and ignition ware 15, the tail gas heating system is connected with tail gas intake pipe 1 for the compensation of tail gas temperature. When the temperature of the tail gas does not reach the temperature set value required by the system, the temperature is heated in a fuel ignition oxidation combustion mode, in the specific application, the fuel in the oil tank 9 is pumped by the oil pump 10 and then is ignited by the igniter 15 for full combustion so as to reach the temperature required by catalytic reaction, and the problem that the pollutant removing effect of the catalyst is influenced by low temperature in the prior art can be effectively solved.
In the catalytic reaction process, the temperature of the exhaust gas inlet pipe 1 is between 100 and 400 ℃ so as to meet the reaction temperature of the subsequent selective catalytic reduction reactor 3 and the catalytic oxidation converter 4, but in order to meet the better catalytic effect, the temperature in the exhaust gas inlet pipe 1 is preferably 180-300 ℃ so as to remove nitrogen oxides, hydrocarbons and CO in the exhaust gas to the greatest extent.
The device also comprises a urea spraying system, wherein the urea spraying system comprises a urea solution tank 11, a urea solution pneumatic pump 12 and a urea solution nozzle 16, and the urea solution spraying system is connected with the mixer 2 and is used for providing ammonia gas required by the tail gas treatment process. In a specific application, the urea solution in the urea solution tank 11 is pumped by the urea solution pneumatic pump 12 and then sprayed into the mixer 2 in a mist form through the urea solution nozzle 16. The urea solution is heated and decomposed in the mixer 2 to generate ammonia and water, which can effectively supply reactants required by the selective catalytic reduction reactor 3 for removing NOx pollutants.
The apparatus further comprises a control and monitoring system comprising:
at least three temperature sensors (13 a, 13b, 13 c) respectively arranged on the tail gas inlet pipe 1, the selective catalytic reduction reactor 3 and the catalytic type filter catcher 5 and used for detecting the temperature;
at least one pressure sensor 17, arranged on the catalytic oxidation converter 4, for detecting the pressure of the exhaust gas;
at least two NOx sensors (14 a, 14 b) respectively arranged on the tail gas inlet pipe 1 and the selective catalytic reduction reactor 3;
a data display 8;
the control monitoring system is connected with the PLC 7, and the PLC 7 obtains data of the temperature sensors (13 a, 13b and 13 c), the pressure sensor 17 and the NOx sensors (14 a and 14 b) for controlling the tail gas heating system and the urea spraying system and displaying the data on a data display on line.
The selective catalytic reduction reactor 3 is a cylindrical barrel made of stainless steel material, and a honeycomb-shaped vanadium-based catalyst is filled in the cylindrical barrel and used for catalyzing the reaction of nitrogen oxides and ammonia gas, so that the reaction efficiency is improved.
After the tail gas enters the device, NO in the tail gasxAnd NH in which the urea solution is decomposed by heating3After the mixture is fully mixed, nitrogen and water are generated through reaction in the selective catalytic reduction reactor 3, and the tail gas enters the catalytic oxidation converter 4 and the catalytic type particle catcher 5 again, wherein hydrocarbon, carbon monoxide and particulate matters which are not completely combusted are combusted, oxidized, filtered and caught.
The embodiment of the utility model provides an in, 70% -90% NOx in the tail gas can be got rid of to selective catalytic reduction reactor 3 under normal operating mode, 80% HC and CO, 10-40% soluble organic matter component of particulate matter can be got rid of to catalytic oxidation converter 4 under normal operating mode, and catalytic type filter trap 5 is arranged in filtering the particulate matter in the entrapment waste gas under normal operating mode, eliminates black cigarette. Finally, the tail gas is discharged out of the system through a chimney 6.
Fig. 2 is the embodiment of the utility model provides a railway engineering machinery engine tail gas clean-up control system flow diagram mainly includes following steps:
at step 209, the PLC controller 7 sends a shutdown signal to the heating system.
To sum up, the embodiment of the utility model provides a railway engineering machinery engine exhaust purification device, the device have solved among the prior art in railway bridge, culvert, tunnel, road bed, track work progress, along with hydrocarbon, CO, particulate matter, black cigarette and nitrogen oxide accumulation, seriously influence operation environment and harm staff health problem.
Claims (6)
1. A tail gas purification device of an engine of railway engineering machinery is characterized by comprising:
a tail gas inlet pipe;
the mixer is used for mixing the ammonia gas and the tail gas entering the system;
the selective catalytic reduction reactor (SCR) is used for catalyzing the reaction of nitrogen oxides and ammonia gas and improving the reaction efficiency;
a catalytic oxidation converter (DOC) for completely oxidizing incompletely combusted hydrocarbons and carbon monoxide of a combustion engine;
a catalyzed particle trap (POC) for trapping larger particulate contaminants;
a PLC controller;
the tail gas inlet pipe, the mixer, the selective catalytic reduction reactor, the catalytic oxidation converter and the catalytic particle catcher are connected through flanges.
2. The engine exhaust gas purification device according to claim 1, further comprising an exhaust gas heating system comprising: oil tank, oil pump and ignition ware, tail gas heating system and tail gas intake-tube connection for the compensation of tail gas temperature.
3. The engine exhaust gas purification device according to claim 1, further comprising a urea spraying system comprising: the device comprises a urea solution tank, a urea solution pneumatic pump and a urea solution nozzle, wherein the urea solution spraying system is connected with a mixer and used for providing ammonia gas required by the tail gas treatment process.
4. The engine exhaust gas purification device according to claim 1, further comprising a control monitoring system including:
the temperature sensors are respectively arranged on the tail gas inlet pipe, the selective catalytic reduction reactor and the catalytic filter trap and are used for detecting the temperature;
at least one pressure sensor disposed on the catalytic oxidation converter;
at least two NOxThe sensors are respectively arranged on the tail gas inlet pipe and the selective catalytic reduction reactor;
a data display;
the control monitoring system is connected with the PLC, and the PLC acquires data of the temperature sensor, the pressure sensor and the NOx sensor and displays the data on the data display on line.
5. The engine exhaust gas purification apparatus according to claim 1, wherein the selective catalytic reduction reactor is a cylindrical cylinder made of a stainless material and filled with a honeycomb-shaped vanadium-based catalyst.
6. The engine exhaust gas purification device according to claim 1, wherein the temperature of the exhaust gas inlet pipe is 100 to 400 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920549020.2U CN210105952U (en) | 2019-04-22 | 2019-04-22 | Tail gas purification device for railway engineering machinery engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920549020.2U CN210105952U (en) | 2019-04-22 | 2019-04-22 | Tail gas purification device for railway engineering machinery engine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112664298A (en) * | 2020-06-16 | 2021-04-16 | 长城汽车股份有限公司 | Exhaust gas purification system for vehicle and exhaust gas purification method for vehicle |
| CN113250788A (en) * | 2021-04-22 | 2021-08-13 | 南京朗森自动化设备有限公司 | Tail gas dual-drop treatment system for in-use vehicle |
| CN113294224A (en) * | 2021-04-22 | 2021-08-24 | 南京朗森自动化设备有限公司 | Tail gas double-reduction treatment method for on-vehicle |
| CN115577963A (en) * | 2022-10-31 | 2023-01-06 | 临沂市政集团有限公司 | Method for early warning carbon emission and reducing energy and carbon in engineering construction process and special system |
-
2019
- 2019-04-22 CN CN201920549020.2U patent/CN210105952U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112664298A (en) * | 2020-06-16 | 2021-04-16 | 长城汽车股份有限公司 | Exhaust gas purification system for vehicle and exhaust gas purification method for vehicle |
| CN113250788A (en) * | 2021-04-22 | 2021-08-13 | 南京朗森自动化设备有限公司 | Tail gas dual-drop treatment system for in-use vehicle |
| CN113294224A (en) * | 2021-04-22 | 2021-08-24 | 南京朗森自动化设备有限公司 | Tail gas double-reduction treatment method for on-vehicle |
| CN115577963A (en) * | 2022-10-31 | 2023-01-06 | 临沂市政集团有限公司 | Method for early warning carbon emission and reducing energy and carbon in engineering construction process and special system |
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