CN209212350U - A kind of compact emission-control equipment for large-scale diesel engine - Google Patents
A kind of compact emission-control equipment for large-scale diesel engine Download PDFInfo
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- CN209212350U CN209212350U CN201821925145.2U CN201821925145U CN209212350U CN 209212350 U CN209212350 U CN 209212350U CN 201821925145 U CN201821925145 U CN 201821925145U CN 209212350 U CN209212350 U CN 209212350U
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- encapsulation
- air inlet
- staving
- inlet pipe
- diesel engine
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000004202 carbamide Substances 0.000 claims abstract description 55
- 238000005538 encapsulation Methods 0.000 claims abstract description 53
- 230000003197 catalytic effect Effects 0.000 claims description 8
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 4
- 238000006555 catalytic reaction Methods 0.000 claims description 2
- 238000000746 purification Methods 0.000 abstract description 4
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 239000003054 catalyst Substances 0.000 description 19
- 238000002156 mixing Methods 0.000 description 17
- 239000007789 gas Substances 0.000 description 11
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000010358 mechanical oscillation Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- -1 comes rear end mixer Chemical compound 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model discloses a kind of compact emission-control equipments 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 utility model relates to large-scale diesel engine exhaust gas purification processing technology fields, more particularly to one kind to be used for large-sized diesel
The compact emission-control equipment and method of machine.
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.
Utility model content
The purpose of this utility model is exactly to solve the above-mentioned problems, to provide a kind of compact row for large-scale diesel engine
Air purifying apparatus and method, air inlet pipe are inserted into catalyst converter, the stream of air current flow direction and catalyst converter interior air-flow in air inlet pipe
Dynamic direction is substantially vertical, and the high-temp waste gas in catalyst converter plays good insulation effect to air inlet pipe, touches after avoiding urea from spraying
Risk is crystallized to cold wall face bring；And close coupling design more compact structure, it is easy mounting arrangements.
To achieve the goals above, the utility model adopts the following technical solution:
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.
The utility model has the beneficial effects that
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 the structural schematic diagram of the utility model.
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 utility model is described in further detail 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.
Air inlet pipe heat preservation is realized in the utility model air inlet pipe insertion encapsulation staving, air inlet pipe and encapsulation barrel body wall are in 90 °,
That is airintake direction and encapsulation staving is in 90 °.
Prime cyclone mixer is designed before the utility model spray site and promotes urea mixed decomposition, while in spray site rear end
It designs rear class mixer and promotes NH3With exhaust mixing uniformity；
The utility model installs cowling panel between rear class mixer and catalyst encapsulation unit and forms equally distributed gas
Stream.
The utility model 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.
It is above-mentioned although specific embodiments of the present invention are described with reference to the accompanying drawings, but it is not practical new to this
The limitation of type protection scope, those skilled in the art should understand that, based on the technical solution of the present invention, ability
Field technique personnel do not need to make the creative labor the various modifications or changes that can be made still in the protection model of the utility model
Within enclosing.
Claims (8)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821925145.2U CN209212350U (en) | 2018-11-21 | 2018-11-21 | A kind of compact emission-control equipment for large-scale diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821925145.2U CN209212350U (en) | 2018-11-21 | 2018-11-21 | A kind of compact emission-control equipment for large-scale diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209212350U true CN209212350U (en) | 2019-08-06 |
Family
ID=67460524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821925145.2U Active CN209212350U (en) | 2018-11-21 | 2018-11-21 | A kind of compact emission-control equipment for large-scale diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209212350U (en) |
-
2018
- 2018-11-21 CN CN201821925145.2U patent/CN209212350U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A compact exhaust purification device for large diesel engine Effective date of registration: 20210601 Granted publication date: 20190806 Pledgee: Shandong Shouguang Rural Commercial Bank Co.,Ltd. Pledgor: SHANDONG KANGJUN ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2021980004246 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20231115 Granted publication date: 20190806 Pledgee: Shandong Shouguang Rural Commercial Bank Co.,Ltd. Pledgor: SHANDONG KANGJUN ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2021980004246 |