CN208255158U - Low-temperature SCR catalyst test device in diesel engine - Google Patents
Low-temperature SCR catalyst test device in diesel engine Download PDFInfo
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- CN208255158U CN208255158U CN201820413162.1U CN201820413162U CN208255158U CN 208255158 U CN208255158 U CN 208255158U CN 201820413162 U CN201820413162 U CN 201820413162U CN 208255158 U CN208255158 U CN 208255158U
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Abstract
Low-temperature SCR catalyst test device and test method in a kind of diesel engine of technical field of internal combustion engines, including electric dynamometer, diesel engine, flow control valve, NOx sensor, temperature sensor, bypass test exhaust pipe, heat exchanger, data acquisition control system, urea injection apparatus, mixing arrangement, heating device, exhaust flow-meter, test SCR catalyst etc., this novel SCR catalyst test device is reequiped on the basis of engine pedestal, by controlling the flow control valve being mounted on two-way exhaust pipe, heat exchanger, heating device, temperature sensor, exhaust flow-meter, it can be in a wide range to the temperature of tail gas, flow, the parameters such as NOx concentration carry out stable regulation.The utility model is designed reasonably, structure is simple, and cryogenic property is tested suitable for diesel SCR catalytic agent.
Description
Technical field
The utility model relates to a kind of SCR of technical field of internal combustion engines post-processing test device and test method, tools
Body is related to testing the test device and test method of cryogenic property in diesel SCR catalytic agent.
Background technique
Nitrogen oxides (NOx) is that emission of diesel engine mainly stains object, according to statistics, NOx in urban atmosphere there are about
1/4 comes from diesel emission.NOx is to form one of principal element of photochemical fog, and the research of control environmental pollution is hot
Point.As diesel engine for automobile quantity is continuously increased in recent years, national governments are increasingly strict to the emission control of diesel engine for automobile, only
It is extremely difficult to following emission regulation demands by emission controls by improving combustion, thus needs to increase additional discharge device.Selective catalysis is also
Former (Selective Catalytic Reduction.SCR) technology with high security, fuel economy it is good, to sulphur in fuel oil
The advantages such as sensitivity is low, it is considered to be one kind can effectively purify NOx, to reach diesel engine for automobile future emission requirement
Method.In terms of engine of boat and ship emission control, according to relevant laws and regulations (such as the Tier III of International Maritime Organization (IMO) and state
Chinese Ministry of Environmental Protection of family is by " engine of boat and ship tailpipe emission limit value and the measurement method (the first and second stage) " of publication) require NOx
Discharge amount reduces by 80% compared to I stage of Tier.Therefore, in order to meet emission regulation demands, ship must take effective means to drop
The discharge of low self-pollution object.
The core of SCR after-treatment device is the catalyst of inside reactor load, but catalyst can go out in the process of running
Existing heat ageing, abrasion, poisoning, cracking etc., cause after-treatment device efficiency to gradually decrease, therefore, the survey of catalyst transformation efficiency
It tries particularly important.Row's temperature, NOx concentration and the air speed of the transformation efficiency of catalyst and engine etc. are closely related, currently commercially
Using more extensive catalyst Applicable temperature at 300~450 DEG C, and middle low-temperature SCR refers to the scope of application of catalyst 150
~300 DEG C.Increasingly strict with emission regulation, the middle low-temperature characteristics research of diesel SCR catalytic agent is increasingly becoming hot spot, especially
It is small for marine low speed diesel engine air speed, the low feature of temperature.But the current domestic performance for middle low-temperature SCR catalyst
Research relies primarily on software and carries out analog simulation, lacks the test platform of good middle low-temperature SCR catalyst, particularly with peculiar to vessel
The test device of low speed machine SCR is very deficient, has seriously affected the flow of research of China's marine low-speed machine SCR after-treatment device.
Summary of the invention
The utility model in view of the above shortcomings of the prior art, provides low-temperature SCR catalyst test in a kind of diesel engine
Device and test method, using two-way gas exhaust piping, i.e. main exhaust and bypass test exhaust pipe, to control test SCR device
Delivery temperature and flow；It, can be in a wide range to the temperature of tail gas, stream by the data acquisition control system of independent research
The parameters such as amount, NOx concentration carry out stable regulation.Device research and development are at low cost, the period is short, accelerate grinding for SCR after-treatment device
Send out speed.
The utility model is achieved through the following technical solutions, and the utility model includes electric dynamometer, diesel oil hair
Motivation, intercooler, air filter, inlet air flow meter, turbocharger, main exhaust, air inlet pipe, the first NOx sensor, former vehicle
SCR device, main flow control valve, water cooling heat exchanger, the first temperature sensor, heat exchange control valve, straight-through control valve, second temperature
Sensor, third temperature sensor, urea injection apparatus, urea pump, heating device, mixing chamber, the 4th temperature sensor, the 5th
Temperature sensor, the second NOx sensor, exhaust flow-meter, SCR test device, bypass testing tube, SCR catalyst, data acquisition
Control system, pipe straight branch, heat exchange branch pipe, electric dynamometer are connected with engine, the gas outlet of air inlet pipe and turbocharger
Air inlet be connected, the air inlet of main exhaust is connected with the gas outlet of turbocharger, and air filter, inlet air flow meter are successively pacified
In air inlet pipe, intercooler is mounted on the pipeline between diesel engine, turbocharger, the first NOx sensor, former vehicle
SCR device, main flow control valve are sequentially arranged on main exhaust, the air inlet and turbocharger of pipe straight branch, former vehicle SCR
Main exhaust between device is connected, and the gas outlet of pipe straight branch is connected with the air inlet of mixing chamber, leads directly to control valve peace
In pipe straight branch, the both ends for the branch pipe that exchanges heat are connected with the pipe straight branch at straight-through control valve both ends respectively, heat exchange control valve,
First temperature sensor, water cooling heat exchanger, second temperature sensor be sequentially arranged at heat exchange branch pipe on, the gas outlet of mixing chamber with
The air inlet of bypass testing tube is connected, and third temperature sensor and urea injection apparatus are sequentially arranged at mixing chamber front end, urine
Element pump is connected with urea injection apparatus, and SCR test device, exhaust flow-meter are sequentially arranged on bypass testing tube, heating device
It is sequentially arranged at SCR test device entrance with the 4th temperature sensor, the 5th temperature sensor and the second NOx sensor are successively
It is mounted on SCR test device exit, SCR catalyst is arranged in SCR test device；Data acquisition control system passes through line
Beam respectively with the first NOx sensor, main flow control valve, the first temperature sensor, heat exchange control valve, straight-through control valve, second
Temperature sensor, third temperature sensor, urea pump, heating device, the 4th temperature sensor, the 5th temperature sensor, second
NOx sensor is connected.
Further, in the present invention, the minimum temperature of the adjustable test branch side of water cooling heat exchanger is
100℃。
Further, in the present invention, the asbestos yarn that heat-insulation and heat-preservation is housed on testing tube, and heating device are bypassed
Maximum heating temperature be 400 DEG C.
Further, in the present invention, the caliber of mixing chamber is to bypass 2 times of testing tube caliber, and mixing chamber
Contain mixing arrangement in inside.
Further, in the present invention, the installation site distance SCR test device entrance of urea injection apparatus
2m。
Further, in the present invention, data acquisition control system uses 20 circuit-switched data channels, including five tunnels
Temperature channel, road Jet control channel all the way, urea pump motor control channel all the way, air solenoid valve control channel all the way, three
Road flow valve control channel, three road flow valve position feedback channels, all the way aqueous solution of urea pressure measurement channel, all the way urea-
Air mixing chamber sprays pressure Measurement channel, and aqueous solution of urea purges pressure release control channel all the way, and the measurement of two tunnel NOx concentrations is logical
Road, all the way exhaust flow-meter Measurement channel etc..
Further, in the present invention, SCR test device can be designed according to the shape size of test catalyst
Change.
Further, in the present invention, the SCR data acquisition control system of independent research can efficiently control
Heat exchanger, heating device and flow control valve, and fed back by exhaust flow-meter and temperature sensor, it is catalyzed its SCR
The temperature of agent is adjusted at 100~400 DEG C.
Compared with prior art, the utility model has the advantages that are as follows: the utility model is designed reasonably, research and development week
Phase is short, is the test device and test method of low-temperature SCR catalyst in one reliable；The SCR data acquisition control of independent research
System can efficiently control heat exchanger, heating device and flow control valve, and by exhaust flow-meter and temperature sensor into
Row feedback can carry out stable regulation to parameters such as the temperature of tail gas, flow, NOx concentrations in a wide range, be particularly suitable for
The performance evaluation of low-temperature SCR catalyst.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Wherein: 1, electric dynamometer, 2, diesel engine, 3, intercooler, 4, air filter, 5, inlet air flow meter, 6,
Booster, the 7, first NOx sensor, 8, former vehicle SCR device, 9, main exhaust, 10, main flow control valve, 11, water cooling heat exchange
Device, the 12, first temperature sensor, 13, heat exchange control valve, 14, straight-through control valve, 15, second temperature sensor, 16, third temperature
Degree sensor, 17, urea injection apparatus, 18, urea pump, 19, heating device, 20, mixing chamber, the 21, the 4th temperature sensor,
22, the 5th temperature sensor, the 23, second NOx sensor, 24, exhaust flow-meter, 25, SCR test device, 26, bypass test
Pipe, 27, SCR catalyst, 28, data acquisition control system, 29, air inlet pipe, 30, pipe straight branch, 31, heat exchange branch pipe.
Specific embodiment
It elaborates with reference to the accompanying drawing to the embodiments of the present invention, the present embodiment is with the utility model technical side
Premised on case, the detailed implementation method and specific operation process are given, but the protection scope of the utility model is not limited to down
The embodiment stated.
Case study on implementation
As shown in Figure 1, the utility model includes electric dynamometer 1, diesel engine 2, intercooler 3, air filter 4, air inlet
Flowmeter 5, turbocharger 6, main exhaust 9, air inlet pipe 29, the first NOx sensor 7, original vehicle SCR device 8, main flow control
Valve 10 processed, water cooling heat exchanger 11, the first temperature sensor 12, heat exchange control valve 13, straight-through control valve 14, second temperature sensor
15, third temperature sensor 16, urea injection apparatus 17, urea pump 18, heating device 19, mixing chamber 20, the 4th temperature sensing
Device 21, the 5th temperature sensor 22, the second NOx sensor 23, exhaust flow-meter 24, SCR test device 25, bypass testing tube
26, SCR catalyst 27, data acquisition control system 28, pipe straight branch 30, heat exchange branch pipe 31, electric dynamometer 1 and engine 2
It is connected, the gas outlet of air inlet pipe 29 is connected with the air inlet of turbocharger 6, the air inlet and turbocharger 6 of main exhaust 9
Gas outlet be connected, air filter 4, inlet air flow meter 5 are sequentially arranged in air inlet pipe 29, and intercooler 3 is mounted on diesel engine
2, on the pipeline between turbocharger 6, the first NOx sensor 7, former vehicle SCR device 8, main flow control valve 10 are successively installed
On main exhaust 9, air inlet and 9 phase of main exhaust between turbocharger 6, former vehicle SCR device 8 of pipe straight branch 30
Connection, the gas outlet of pipe straight branch 30 are connected with the air inlet of mixing chamber 20, and straight-through control valve 14 is mounted on pipe straight branch 30
On, the both ends of heat exchange branch pipe 31 are connected with the pipe straight branch 30 at straight-through 14 both ends of control valve respectively, and exchange heat control valve 13, first
Temperature sensor 12, water cooling heat exchanger 11, second temperature sensor 15 are sequentially arranged on heat exchange branch pipe 31, and mixing chamber 20 goes out
Port is connected with the air inlet of bypass testing tube 26, and third temperature sensor 16 and urea injection apparatus 17 are sequentially arranged at
20 front end of mixing chamber, urea pump 18 are connected with urea injection apparatus 17, and SCR test device 25, exhaust flow-meter 24 are successively installed
On bypass testing tube 26, heating device 19 and the 4th temperature sensor 21 are sequentially arranged at 25 entrance of SCR test device, the
Five temperature sensors 22 and the second NOx sensor 23 are sequentially arranged at 25 exit of SCR test device, and SCR catalyst 27 is arranged
In SCR test device 25；Data acquisition control system 28 by harness respectively with the first NOx sensor 7, main flow control valve
10, the first temperature sensor 12, heat exchange control valve 13, straight-through control valve 14, second temperature sensor 15, third temperature sensing
Device 16, urea pump 18, heating device 19, the 4th temperature sensor 21, the 5th temperature sensor 22,23 phase of the second NOx sensor
Connection；The caliber of mixing chamber 20 is 2 times of bypass 26 caliber of testing tube, and contains mixing arrangement inside mixing chamber 20；Urea spray
The 25 entrance 2m of installation site distance SCR test device of injection device 17.
In the course of work of the utility model, using two-way exhaust pipe: main exhaust 9 and bypass test exhaust pipe 26,
The flow and temperature of test branch side are controlled, it by adjusting the different operating point of engine, can be effectively in wide scope
It is interior that stable regulation is carried out to parameters such as the temperature of tail gas, flow, NOx concentrations.Pass through main flow control valve 10, heat exchange control in device
Valve 13 processed, straight-through control valve 14 carry out the flow and temperature of controlling brancher, and the unlatching size of valve passes through the first temperature sensor 12, the
Two temperature sensors 15, third temperature sensor 16, the 4th temperature sensor 21, the 5th temperature sensor 22 and it is mounted on branch
The exhaust flow-meter 24 of side is fed back.First NOx sensor 7, the second NOx sensor 23 are to monitor catalyst to NOx
Transformation efficiency, wherein the first NOx sensor 7 is mounted on exhaust main front end, for monitoring the NOx concentration before conversion；Second
After NOx sensor 23 is mounted on catalyst converter, for monitor conversion after NOx concentration.
In order to realize the accurate control to aqueous solution of urea flow, a set of SCR data of independent research in the utility model
Acquisition control system 28 can be realized extraction flow adjusting, temperature is adjusted and NOx concentration is adjusted.Data acquisition control system 28
Using 20 circuit-switched data channels, including five tunnel temperature channels, road Jet control channel all the way, urea pump motor control is logical all the way
Road, all the way air solenoid valve control channel, No. three flow valve control channels, three road flow valve position feedback channels, all the way urea
Aqueous solution pressure measurement channel, urea-air mixing chamber sprays pressure Measurement channel all the way, and aqueous solution of urea purges pressure release all the way
Control channel, two tunnel NOx concentration Measurement channels, all the way exhaust flow-meter Measurement channel.
Air enters 6 import of engine supercharger by air filter 4, inlet air flow meter 5, then passes through intercooler 3
Into engine 2, the different operating points of engine 2 can be adjusted by electric dynamometer 1.
The tail gas that engine 2 generates is flowed through all the way after exhaust manifold comes out with former rack SCR device 8 and main flow
The exhaust main 9 of valve 10 is flowed through all the way equipped with heat exchanger 11, mixing chamber 20, heating device 19, SCR test device 25 and exhaust
The bypass testing tube 26 of flowmeter 24.
After determining test point, the operating condition by adjusting engine reaches the NOx concentration set before conversion, by the first NOx
Sensor 7 is fed back；By adjusting the unlatching size of three flow valves, adjusts and arrive required temperature and air speed.To NOx concentration, temperature
After degree and air speed determine, according to the urea injection cycle and injection pulse width demarcated in advance, driving circuit drives metering valve events,
Aqueous solution of urea is mixed with atomizing air enters exhaust pipe through nozzle.In order to preferably by the aqueous solution of urea and tail gas after injection
It is mixed, has installed the heavy caliber mixing chamber 20 for having static mixer in the utility model additional.The urea in exhaust pipe
Aqueous solution partly or entirely resolves into ammonia (NH3) and water after evaporation, pyrolysis and a series of physical-chemical reaction of hydrolysis
(H20) and with exhaust it is sufficiently mixed, subsequently into SCR test device 25.Under the catalytic action of SCR catalyst 27, ammonia with
NOx, which reacts rapidly, generates nitrogen (N2) and water (H20), is discharged into atmosphere by the exhaust pipe equipped with exhaust flow-meter 24 with exhaust.
Therefore, the utility model is suitable for the various test experiments with low-temperature SCR catalyst diesel engine, more particularly to
It is tested in performance test, the quick aging of marine low speed diesel engine SCR catalyst.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are also included in the patent protection scope of the utility model.
Claims (7)
1. low-temperature SCR catalyst test device in a kind of diesel engine, including electric dynamometer (1), diesel engine (2), in it is cold
Device (3), air filter (4), inlet air flow meter (5), turbocharger (6), main exhaust (9), air inlet pipe (29), electric dynamometer
(1) it is connected with engine (2), the gas outlet of air inlet pipe (29) is connected with the air inlet of turbocharger (6), main exhaust (9)
Air inlet be connected with the gas outlet of turbocharger (6), air filter (4), inlet air flow meter (5) are sequentially arranged at air inlet pipe
(29) on, intercooler (3) is mounted on the pipeline between diesel engine (2), turbocharger (6), which is characterized in that is also wrapped
Include the first NOx sensor (7), former vehicle SCR device (8), main flow control valve (10), water cooling heat exchanger (11), the first temperature biography
Sensor (12), heat exchange control valve (13), straight-through control valve (14), second temperature sensor (15), third temperature sensor (16),
Urea injection apparatus (17), urea pump (18), heating device (19), mixing chamber (20), the 4th temperature sensor (21), the 5th temperature
Spend sensor (22), the second NOx sensor (23), exhaust flow-meter (24), SCR test device (25), bypass testing tube (26),
SCR catalyst (27), data acquisition control system (28), pipe straight branch (30), heat exchange branch pipe (31), the first NOx sensor
(7), former vehicle SCR device (8), main flow control valve (10) are sequentially arranged on main exhaust (9), the air inlet of pipe straight branch (30)
Main exhaust (9) between mouth and turbocharger (6), former vehicle SCR device (8) is connected, the gas outlet of pipe straight branch (30)
It is connected with the air inlet of mixing chamber (20), straight-through control valve (14) are mounted on pipe straight branch (30), heat exchange branch pipe (31)
Both ends are connected with the pipe straight branch (30) at straight-through control valve (14) both ends respectively, and exchange heat control valve (13), the first temperature sensing
Device (12), water cooling heat exchanger (11), second temperature sensor (15) are sequentially arranged in heat exchange branch pipe (31), mixing chamber (20)
Gas outlet is connected with the air inlet of bypass testing tube (26), and third temperature sensor (16) and urea injection apparatus (17) are successively
It is mounted on mixing chamber (20) front end, urea pump (18) is connected with urea injection apparatus (17), SCR test device (25), exhaust stream
Meter (24) is sequentially arranged in bypass testing tube (26), and heating device (19) and the 4th temperature sensor (21) are sequentially arranged at
SCR test device (25) entrance, the 5th temperature sensor (22) and the second NOx sensor (23) are sequentially arranged at SCR test
Device (25) exit, SCR catalyst (27) are arranged in SCR test device (25)；Data acquisition control system (28) passes through
Harness respectively with the first NOx sensor (7), main flow control valve (10), the first temperature sensor (12), heat exchange control valve
(13), control valve (14), second temperature sensor (15), third temperature sensor (16), urea pump (18), heating device are led directly to
(19), the 4th temperature sensor (21), the 5th temperature sensor (22), the second NOx sensor (23) are connected.
2. low-temperature SCR catalyst test device in diesel engine according to claim 1, which is characterized in that water cooling heat exchanger
(11) minimum temperature of adjustable test branch side is 100 DEG C.
3. low-temperature SCR catalyst test device in diesel engine according to claim 2, which is characterized in that bypass testing tube
(26) asbestos yarn of heat-insulation and heat-preservation is housed, and the maximum heating temperature of heating device (19) is 400 DEG C on.
4. low-temperature SCR catalyst test device in diesel engine according to claim 3, which is characterized in that mixing chamber (20)
Caliber be to bypass 2 times of testing tube (26) caliber, and contain mixing arrangement inside mixing chamber (20).
5. low-temperature SCR catalyst test device in diesel engine according to claim 4, which is characterized in that urea injection dress
Set installation site distance SCR test device (25) the entrance 2m of (17).
6. low-temperature SCR catalyst test device in diesel engine according to claim 5, which is characterized in that data acquisition control
System (28) processed uses 20 circuit-switched data channels, including five tunnel temperature channels, all the way road Jet control channel, all the way urea pump horse
Up to control channel, air solenoid valve control channel all the way, No. three flow valve control channels, three road flow valve position feedback channels,
Aqueous solution of urea pressure measurement channel all the way, urea-air mixing chamber sprays pressure Measurement channel all the way, all the way aqueous solution of urea
Purge pressure release control channel, two tunnel NOx concentration Measurement channels, all the way exhaust flow-meter Measurement channel.
7. low-temperature SCR catalyst test device in diesel engine according to claim 6, which is characterized in that SCR test device
(25) can be changed according to the shape size of test catalyst to design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820413162.1U CN208255158U (en) | 2018-03-26 | 2018-03-26 | Low-temperature SCR catalyst test device in diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820413162.1U CN208255158U (en) | 2018-03-26 | 2018-03-26 | Low-temperature SCR catalyst test device in diesel engine |
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| Publication Number | Publication Date |
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| CN208255158U true CN208255158U (en) | 2018-12-18 |
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| CN201820413162.1U Active CN208255158U (en) | 2018-03-26 | 2018-03-26 | Low-temperature SCR catalyst test device in diesel engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153503A (en) * | 2021-04-27 | 2021-07-23 | 河南柴油机重工有限责任公司 | SCR catalyst degradation test device and test method |
-
2018
- 2018-03-26 CN CN201820413162.1U patent/CN208255158U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153503A (en) * | 2021-04-27 | 2021-07-23 | 河南柴油机重工有限责任公司 | SCR catalyst degradation test device and test method |
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