CN109707488A - A kind of compact emission-control equipment and method for large-scale diesel engine - Google Patents
A kind of compact emission-control equipment and method for large-scale diesel engine Download PDFInfo
- Publication number
- CN109707488A CN109707488A CN201811390687.9A CN201811390687A CN109707488A CN 109707488 A CN109707488 A CN 109707488A CN 201811390687 A CN201811390687 A CN 201811390687A CN 109707488 A CN109707488 A CN 109707488A
- Authority
- CN
- China
- Prior art keywords
- encapsulation
- air inlet
- inlet pipe
- staving
- urea
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Abstract
The invention discloses a kind of compact emission-control equipments and method for large-scale diesel engine, purification device includes encapsulation staving, drive end bearing bracket and rear end cap are respectively equipped with before and after encapsulation staving, air inlet pipe and encapsulation staving are in 90 °, inject the inside of encapsulation staving, the top of air inlet pipe is equipped with urea nozzle seat, and urea nozzle seat is connect with the nozzle being arranged in inside air inlet pipe, and the top of nozzle is equipped with prime cyclone mixer；The lower part of air inlet pipe is equipped with rear class mixer；The rear portion of air inlet pipe is successively arranged cowling panel, SCR encapsulation unit and acoustical panel in encapsulation staving；Rear end cap is connect with escape pipe.Prime cyclone mixer is devised before nozzle, devises rear class mixer in nozzle rear end appropriate location.Prime cyclone mixer forms swirling eddy, mixes urea and exhaust gas, promotes the fast endothermic of urea droplets to decompose, and urea droplets are not directly contacted with prime cyclone mixer, avoids urea droplets and adheres to bring crystallization risk on prime cyclone mixer.
Description
Technical field
The present invention relates to large-scale diesel engine exhaust gas purification processing technology fields more particularly to a kind of for large-scale diesel engine
Compact emission-control equipment and method.
Background technique
Selective catalytic reduction (SCR) can be while guaranteeing engine power performance and economy, effectively solution NOXRow
The problem of putting meets the requirement of environmental regulation, which is widely used in diesel engine for automobile state IV, state V stage.
The basic functional principle of SCR is that reducing agent, reducing agent are sprayed into Diesel Engine Exhaust Pipe by urea injection apparatus
Under the effect of the catalyst with NOXIt reacts, by NOXEmission control is within regulation limit value.Whole system by urea spray and
Control device, urea mixing device and catalytic unit composition, general principles are as shown in Figure 1.
According to engine operating condition, the moment calculates the urea injecting quantity currently needed for urea injection and control device, realizes spray
The accurate control for the amount of penetrating, and guarantee to obtain ideal spray characteristics after urea sprays；Urea is in exhaust pipe in mixing arrangement
Effect is lower quickly to be mixed with high-temp waste gas, makes urea endothermic decomposition at NH3(reaction 1)；Last NH3Under the effect of the catalyst with
NOXIt reacts, reaches and eliminate NOXThe purpose (reaction 2,3) of discharge.
(NH2)2CO+H2O→CO2+2NH3 (1)
4NO+4NH3+O2→4N2+6H2O (2)
NO+NO2+2NH3→2N2+3H2O (3)
SCR technology is in diesel engine for automobile field relative maturity, but diesel engine for automobile power is smaller, and maximum is no more than
400kW.With the continuous upgrading of environmental regulation, the non-rice habitats large-scale diesel engine of 400kW or more is also required to matching SCR technology ability
Meet the requirement of emission regulation, the SCR system of diesel engine for automobile, which is limited to following factor, cannot be directly used to large-scale diesel engine
Matching.
(1) urea injecting quantity that large-scale diesel engine needs is larger, current urea for vehicle injection apparatus, usual maximum injection
Ability is not able to satisfy the demand of high-power diesel engine the amount of injection in 7.0L/h or so；
(2) it under big urea injecting quantity, realizes the quick mixed decomposition of urea and exhaust gas, prevents urea crystals, guarantees catalysis
Efficiency needs specially to design efficient urea mixing device；
(3) application for adapting to large-scale diesel engine needs to match bigger catalyst volume, and existing catalyst converter structure cannot
It is applicable in the encapsulation of more volume catalyst.
Summary of the invention
The purpose of the present invention is to solve the above-mentioned problems, and it is net to provide a kind of compact exhaust for large-scale diesel engine
Change device and method, air inlet pipe is inserted into catalyst converter, the flowing side of air current flow direction and catalyst converter interior air-flow in air inlet pipe
To substantially vertical, the high-temp waste gas in catalyst converter plays good insulation effect to air inlet pipe, encounters after avoiding urea from spraying cold
Wall surface bring crystallizes risk；And close coupling design more compact structure, it is easy mounting arrangements.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of compact emission-control equipment for large-scale diesel engine, including staving is encapsulated, before the encapsulation staving
After be respectively equipped with drive end bearing bracket and rear end cap, the inside of the encapsulation staving, the air-flow stream in air inlet pipe are injected in the lower part of air inlet pipe
Dynamic direction and the flow direction of catalyst converter interior air-flow are substantially vertical, extend air-flow flow path, there is urea and exhaust gas more
Sufficient incorporation time, the top of the air inlet pipe are equipped with urea nozzle seat, urea nozzle seat and are arranged in inside air inlet pipe
The top of nozzle connection, the nozzle is equipped with prime cyclone mixer；The lower part of the air inlet pipe is equipped with rear class mixer；
The rear portion of air inlet pipe is successively arranged cowling panel, catalytic module and acoustical panel in the encapsulation staving；
The rear end cap is connect with escape pipe.
The drive end bearing bracket and rear end cap are all fixed together with the encapsulation staving respectively, formed sealing space, realize with
The sealing of outside air.
The air inlet pipe and encapsulation staving are in 90 °, and the air inlet pipe is equipped with inlet flange, and escape pipe is equipped with outlet method
It is blue.
The air inlet pipe is equipped with block temperature sensor, is used to mounting temperature sensor and measures delivery temperature, as urea
The input signal of injection control；Escape pipe is equipped with NOXSensor holder, for installing NOXSensor, as control system NOXIt is super
The input of mark diagnosis or closed-loop control.
The bottom of the air inlet pipe is fixed together by several support frames and encapsulation staving, is strengthened mechanical structure, is kept away
Exempt from mechanical oscillation in operational process to cause the failure modes such as to snap, be broken.
The catalytic module includes SCR encapsulation unit, front end panel and rear bearing sheet, the front and back of the SCR encapsulation unit
It is separately fixed on front end panel and rear bearing sheet.
The SCR encapsulation unit includes multiple SCR encapsulation unit components of a SCR encapsulation unit component or parallel connection, is led to
It crosses the quantity in parallel for increasing or decreasing SCR encapsulation unit component or adjusts its length, adapt to different capacity diesel engine NOXConvert energy
The demand of power.
It is integrally fixed in the escape pipe insertion encapsulation staving with acoustical panel and rear end cap, elevating mechanism intensity.
Using a kind of purification method of the compact emission-control equipment for large-scale diesel engine, comprising:
Exhaust is entered in encapsulation staving by air inlet pipe, and rectified plate forms the equally distributed air-flow of speed；
Before prime cyclone mixer installs urea injection point nozzle, swirling eddy is formed, reinforces the fast of urea and exhaust
Speed mixing, promotes the fast decoupled of urea, promotes NH3With exhaust mixing uniformity；
Rear class mixer promotes NH again3With the mixing of exhaust, NH is promoted3The uniformity being distributed in exhaust improves
NOXCatalytic efficiency reduces NH3Risk of leakage；
Exhaust flows through catalytic module, the NH that NOx and urea resolve under the effect of the catalyst3Reaction, reaching reduces NOx
The purpose of discharge；
Exhaust, which reaches acoustical panel, reduces exhaust noise, flows out through escape pipe.
In air inlet pipe insertion encapsulation staving, high-temp waste gas keeps the temperature air inlet pipe, encounters cold wall after avoiding urea from spraying
Face bring crystallizes risk.
Beneficial effects of the present invention:
1, prime cyclone mixer is devised before nozzle, devises rear class mixer in nozzle rear end appropriate location.Before
Grade cyclone mixer forms swirling eddy, mixes urea and exhaust gas, promotes the fast endothermic of urea droplets to decompose, and urea solution
Drop is not directly contacted with prime cyclone mixer, is avoided urea droplets and is adhered to bring crystallization wind on prime cyclone mixer
Danger.
When air-flow, which carries urea, comes rear end mixer, urea substantially decomposes and completes to decompose, and rear class mixer can
To promote NH again3With the mixing of exhaust gas, NH is promoted3The uniformity being distributed in the offgas improves NOXCatalytic efficiency reduces NH3
Risk of leakage.
2, urea nozzle and catalyst converter close coupling are arranged, air inlet mixing tube and catalyst converter are integrated, the insertion of air inlet mixing tube
In catalyst converter, the flow direction of air current flow direction and catalyst converter interior air-flow in air inlet pipe is substantially vertical, the height in catalyst converter
Warm exhaust gas plays good insulation effect to air inlet mixing tube, and bring crystallization risk in cold wall face is encountered after avoiding urea from spraying；
Air-flow flow path is extended simultaneously, increases incorporation time；Close coupling design more compact structure is easy mounting arrangements.
3, meet the needs of large-scale diesel engine is to catalytic capability, adjustable SCR envelope using multichannel SCR encapsulation unit parallel connection
The length of unit or the number of rows of encapsulation unit in parallel are filled, the backpressure requirements of client are taken into account while meeting catalytic capability.
4, noise-reducing structure is designed in catalyst converter rear end, and catalyst converter and muffler are integrated, so that exhaust system is more compact, holds
Arrangement easy to install, while reducing the cost of whole gas extraction system.
Detailed description of the invention
Fig. 1 is the basic functional principle of SCR；
Fig. 2 is structural schematic diagram of the invention.
Wherein, 1, inlet flange, 2, block temperature sensor, 3, prime cyclone mixer, 4, urea nozzle seat, 5, nozzle,
6, air inlet pipe, 7, drive end bearing bracket, 8, rear class mixer, 9, support frame, 10, cowling panel, 11, front end panel, 12, SCR encapsulation unit,
13, staving, 14, rear bearing sheet, 15, acoustical panel, 16, rear end cap, 17, escape pipe, 18, NOx sensor seat, 19, outlet are encapsulated
Flange.
Specific embodiment
The invention will be further described with embodiment with reference to the accompanying drawing.
As shown in Figure 1, a kind of compact emission-control equipment for large-scale diesel engine, along exhaust stream in air inlet pipe 6
Dynamic direction, successively design has block temperature sensor 2, prime cyclone mixer 3, urea nozzle seat 4, urea nozzle 5 and rear class
Mixer 8.
Block temperature sensor 2 is used to mounting temperature sensor and measures delivery temperature, and the input as urea injection control is believed
Number.Before prime cyclone mixer 3 installs urea injection point, swirling eddy is formed, reinforces the quick mixing of urea and exhaust, is promoted
Into the fast decoupled of urea, NH is promoted3With exhaust mixing uniformity.
Urea nozzle seat 4 can promote NH to install urea spray gun, rear class mixer 8 again3With the mixing of exhaust gas,
Promote NH3The uniformity being distributed in the offgas improves NOXCatalytic efficiency reduces NH3Risk of leakage.
In the insertion encapsulation staving 13 of air inlet pipe 6, it is kept the temperature using high-temp waste gas, is encountered after avoiding urea from spraying cold
Wall surface bring crystallizes risk.
The end of air inlet pipe 6 is welded together by several support frames 9 and encapsulation staving 13, is strengthened mechanical structure, is kept away
Exempt from mechanical oscillation in operational process to cause the failure modes such as to snap, be broken.
Catalytic module is made of front end panel 11, SCR encapsulation unit 12 and 14 three parts of rear bearing sheet, SCR encapsulation unit
12 front and back is separately fixed on front end panel 11 and rear bearing sheet 14, and SCR encapsulation unit includes a SCR encapsulation unit component
Or multiple SCR encapsulation unit components in parallel；The quantity in parallel of SCR encapsulation unit component can be increased or decreased or adjust its length
Degree adapts to the demand of different capacity Diesel NOx conversion capability, combines the requirement of client's back pressure.
Design has NOx sensor seat 18 on escape pipe 17, for installing NOx sensor, examines as control system NOx is exceeded
Disconnected or closed-loop control input.
, elevating mechanism intensity integral with acoustical panel 15 and 16 welding machine of rear end cap in the insertion encapsulation staving 13 of escape pipe 17.
Encapsulation staving 13, drive end bearing bracket 7 and rear end cap 16 weld together, and realize the sealing with outside air.
Realize air inlet pipe heat preservation in air inlet pipe of the present invention insertion encapsulation staving, air inlet pipe with to encapsulate barrel body wall in 90 °, i.e., into
Gas direction and encapsulation staving are in 90 °.
Prime cyclone mixer is designed before spray site of the present invention and promotes urea mixed decomposition, while being designed in spray site rear end
Rear class mixer promotes NH3With exhaust mixing uniformity；
The present invention installs cowling panel between rear class mixer and catalyst encapsulation unit and forms equally distributed air-flow.
The present invention meets the needs of high-power diesel engine NOx conversion ability using the parallel connection of multichannel encapsulation unit.
A kind of purification method of the compact emission-control equipment for large-scale diesel engine, comprising:
It is connected by inlet flange 1 with engine supercharger exiting exhaust gas pipe, exhaust passes through air inlet pipe 6, rectified plate
10 form the equally distributed air-flow of speed.
Then exhaust flows through SCR encapsulation unit, the NH that NOx and urea resolve under the effect of the catalyst3Reaction, reaches
Reduce the purpose of NOx emission.
Finally exhaust, which reaches acoustical panel 15, reduces exhaust noise, flows out through escape pipe 17,17 tip designs of escape pipe have out
Gas flange 19, can be with subsequent piping connection.
Before prime cyclone mixer installs urea injection point nozzle, swirling eddy is formed, reinforces the fast of urea and exhaust
Speed mixing, promotes the fast decoupled of urea, promotes NH3With exhaust mixing uniformity；
Rear class mixer promotes NH again3With the mixing of exhaust, NH is promoted3The uniformity being distributed in exhaust improves
NOXCatalytic efficiency reduces NH3Risk of leakage.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of compact emission-control equipment for large-scale diesel engine, characterized in that including encapsulating staving, the encapsulation bucket
Drive end bearing bracket and rear end cap are respectively equipped with before and after body, the inside of the encapsulation staving, the air inlet pipe are injected in the lower part of air inlet pipe
Top be equipped with urea nozzle seat, urea nozzle seat connect with the nozzle being arranged in inside air inlet pipe, and the top of the nozzle is set
There is prime cyclone mixer；The lower part of the air inlet pipe is equipped with rear class mixer；
The rear portion of air inlet pipe is successively arranged cowling panel, catalytic module and acoustical panel in the encapsulation staving；
The rear end cap is connect with escape pipe.
2. a kind of compact emission-control equipment for large-scale diesel engine as described in claim 1, characterized in that the front end
Lid and rear end cap are all fixed together with the encapsulation staving respectively, form sealing space.
3. a kind of compact emission-control equipment for large-scale diesel engine as described in claim 1, characterized in that the air inlet
Pipe and encapsulation staving are in 90 °.
4. a kind of compact emission-control equipment for large-scale diesel engine as described in claim 1, characterized in that the air inlet
Pipe is equipped with block temperature sensor, and escape pipe is equipped with NOx sensor seat.
5. a kind of compact emission-control equipment for large-scale diesel engine as described in claim 1, characterized in that the air inlet
The bottom of pipe is fixed together by several support frames and encapsulation staving.
6. a kind of compact emission-control equipment for large-scale diesel engine as described in claim 1, characterized in that the catalysis
Module includes SCR encapsulation unit, front end panel and rear bearing sheet, is separately fixed at front support before and after the SCR encapsulation unit
On plate and rear bearing sheet.
7. a kind of compact emission-control equipment for large-scale diesel engine as claimed in claim 6, characterized in that the SCR
Encapsulation unit includes multiple SCR encapsulation unit components of a SCR encapsulation unit component or parallel connection.
8. a kind of compact emission-control equipment for large-scale diesel engine as claimed in any one of claims 1 to 6, feature
It is to be integrally fixed in the escape pipe insertion encapsulation staving with acoustical panel and rear end cap.
9. using a kind of purification of the compact emission-control equipment for large-scale diesel engine described in claim 1-6 any one
Method, characterized in that include:
Exhaust is entered in encapsulation staving by air inlet pipe, and rectified plate forms the equally distributed air-flow of speed；
Before prime cyclone mixer installs urea injection point nozzle, swirling eddy is formed, reinforce urea and is vented quick mixed
It closes, promotes the fast decoupled of urea, promote NH3With exhaust mixing uniformity；
Rear class mixer promotes NH again3With the mixing of exhaust, NH is promoted3The uniformity being distributed in exhaust improves NOXIt urges
Change efficiency, reduces NH3Risk of leakage；
Exhaust flows through catalytic module, the NH that NOx and urea resolve under the effect of the catalyst3Reaction, reaches reduction NOx emission
Purpose；
Exhaust, which reaches acoustical panel, reduces exhaust noise, flows out through escape pipe.
10. purification method as claimed in claim 9, characterized in that in air inlet pipe insertion encapsulation staving, high-temp waste gas is to air inlet
Pipe is kept the temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811390687.9A CN109707488A (en) | 2018-11-21 | 2018-11-21 | A kind of compact emission-control equipment and method for large-scale diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811390687.9A CN109707488A (en) | 2018-11-21 | 2018-11-21 | A kind of compact emission-control equipment and method for large-scale diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109707488A true CN109707488A (en) | 2019-05-03 |
Family
ID=66254932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811390687.9A Withdrawn CN109707488A (en) | 2018-11-21 | 2018-11-21 | A kind of compact emission-control equipment and method for large-scale diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109707488A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523843A (en) * | 2020-11-17 | 2021-03-19 | 江苏大学 | Control device and method for actively regulating and controlling working environment of diesel engine SDPF system |
| CN113090373A (en) * | 2021-02-08 | 2021-07-09 | 浙江春风动力股份有限公司 | All-terrain vehicle |
| CN114810293A (en) * | 2022-04-21 | 2022-07-29 | 无锡威孚力达催化净化器有限责任公司 | Device and method for controlling and eliminating SCR system mixer crystallization |
-
2018
- 2018-11-21 CN CN201811390687.9A patent/CN109707488A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523843A (en) * | 2020-11-17 | 2021-03-19 | 江苏大学 | Control device and method for actively regulating and controlling working environment of diesel engine SDPF system |
| CN112523843B (en) * | 2020-11-17 | 2022-03-22 | 江苏大学 | Control device and method for actively regulating and controlling working environment of diesel engine SDPF system |
| CN113090373A (en) * | 2021-02-08 | 2021-07-09 | 浙江春风动力股份有限公司 | All-terrain vehicle |
| CN114810293A (en) * | 2022-04-21 | 2022-07-29 | 无锡威孚力达催化净化器有限责任公司 | Device and method for controlling and eliminating SCR system mixer crystallization |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104295348B (en) | The nozzle cooling system and technology of diesel exhaust gas fluid injection system | |
| CN109707488A (en) | A kind of compact emission-control equipment and method for large-scale diesel engine | |
| JP5804376B2 (en) | Exhaust gas purification device for internal combustion engine | |
| US9273580B2 (en) | Metering system for injecting a reducing agent into the exhaust gas flow of an internal combustion engine | |
| CN203347898U (en) | Integrated selective catalytic reduction (SCR) catalytic silencer | |
| WO2015154640A1 (en) | Scr injection metering module and control method | |
| CN104136727B (en) | Waste gas purification apparatus | |
| CN207989115U (en) | Exhaust gas post-treatment device | |
| CN105673159A (en) | Engine exhaust system and engine applying same | |
| CN206144635U (en) | Processing apparatus after integrated injection formula of SCR | |
| CN108087067A (en) | Eddy flow urea mixing device | |
| CN107916973B (en) | SCR urea sprays protection system | |
| CN109173725A (en) | A kind of marine low speed diesel engine exhaust gas plenum chamber with catalytic denitration function | |
| CN104847463A (en) | Nozzle integrated SCR post treatment unit and method thereof | |
| CN209212350U (en) | A kind of compact emission-control equipment for large-scale diesel engine | |
| CN207686804U (en) | Eddy flow urea mixing device | |
| CN212337411U (en) | Efficient aftertreatment packaged SCR mixer system | |
| JP2013124642A (en) | Exhaust emission control device of internal combustion engine | |
| CN202081942U (en) | Liquid heating type metering injection pump for SCR system | |
| CN107532495A (en) | Reductant metering system with modular construction | |
| US20130240067A1 (en) | Reducing Agent Dosting System for Injection Reducing Agent into the Exhaust Gas Flow of an Internal Combustion Engine | |
| CN108150255B (en) | Treating fluid mixing device for vehicle tail gas treatment | |
| CN207634150U (en) | A kind of metering injector of the spliced cooling jacket of band | |
| CN207686807U (en) | Vent gas treatment urea mixing device | |
| JP5915927B2 (en) | Exhaust gas purification device for internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190503 |
|
| WW01 | Invention patent application withdrawn after publication |