CN206439091U - Diesel exhaust aftertreatment regenerating unit - Google Patents

Abstract

The utility model is related to a kind of diesel exhaust aftertreatment regenerating unit, belongs to the tail gas clean-up technical field of diesel engine.Heat riser of the present utility model uses compressed air type atomizer, liquid diesel directly can be converted into spray pattern, by preliminary mixed atomization gaseous diesel gaseous mixture, mixed again with the air entered by air supply pipe in chamber two, gaseous mixture sprays by gas outlet again, further mix and light in proportion with the waste gas of diesel engine in the inside of chamber one, formed optimal fuel oil than fuel-air mixture, realize on the whole air, in gaseous diesel and diesel engine after treatment device the accurate ratio of waste gas mixing control.While optimum temperature being reached inside chamber one, a part of it can be passed through by the flame flow of even flow plate out of airflow hole, a part can carry out drainage by drainage trough, another part is passed through at the housing slot by even flow plate and constant-current stabilizer, finally plays the effect of buffering and uniform divided flows flame flow.

Description

Diesel exhaust aftertreatment regenerating unit

Technical field

The utility model is related to a kind of diesel exhaust aftertreatment regenerating unit, is mainly used in diesel exhaust aftertreatment dress The regeneration treatment put, belongs to the tail gas clean-up technical field of diesel engine.

Background technology

Diesel engine exhausting after-treatment device, its principle is：Pass through oxidation catalyst（DOC）The oxygen that motor vehicle emission is gone out Change carbon（CO）, hydrocarbon（CH）Oxidation, then with wall flow particulate filters（DPF）, by superfine nano soot particle（Tail Gas particles）Filtered, the clean gas after filtering is discharged by the port of export, so as to reach the mesh of reduction dusty gas discharge 's.

Under normal circumstances, the diesel engine exhausting after-treatment device of prior art all has regeneration function, and its principle is：Master control The unit processed diesel vehicle that collection comes in real time（Diesel engine）Tail gas delivery temperature and backpressure data, when tail gas back pressure is too high, table The particulate matter collected by DPF in bright exhaust gas cleaner has reached regeneration requirements, it is necessary to carry out regeneration treatment, and main control unit will Prepare into regeneration, and driver, when delivery temperature also reaches setting value, then main control are pointed out by liquid crystal operation device Unit sends the series of instructions of Regeneration control automatically, and drives the uniform oil gas of high pressure fuel evaporator ejection to be burnt, main Control unit automatically adjusts the target temperature set according to user in regenerative process the frequency of fuel evaporator, quick and accurate Be controlled, it is ensured that within the most short time by the particulate matter PM being deposited in DPF burn out.So as to reach automated cleaning honeycomb The purpose of particle trapper, it is long-term to reuse.

Heat riser is used as the core apparatus of diesel exhaust aftertreatment regenerating unit, its structural stability and warming It can directly affect whether the regenerating unit can burn out the particulate matter PM being deposited in DPF.Patent publication No. is The application for a patent for invention of " CN104912631 " discloses " a kind of active regeneration system of diesel particulate filter ", want for Other prior arts, the problem of technical scheme of the application for a patent for invention solves the ignition results difference of high temperature cleaning plant, more It is important that the problem of solving high-pressure gaseous diesel oil and air mixed effect so that burning is abundant, the documents are solved should The mentality of designing that technical problem is taken is：To prevent the problem of ignition results are poor, what is taken is by the way that igniter is arranged on Ignite inside lumen, and combined by air storing cavity and air dispersion impeller so that the burning of gaseous diesel fully with stably.So And, the regenerative process of diesel engine exhausting after-treatment device is quick and of short duration process, is needed when lighting gaseous diesel quick And be accurately controlled, it is ensured that the particulate matter PM being deposited in DPF is burnt out within the most short time, the hair of the documents Although bright patent application scheme preferably can fully be contacted air by air dispersion impeller with gaseous diesel, it reaches Fully burning when need the regular hour, be the process constantly heated up, and usually contain in the tail gas of diesel engine carbon monoxide, The waste gas such as hydrocarbon, are mixed with the waste gas again after gaseous diesel is lighted, and can influence particulate matter PM combustion efficiency.

Constant-current stabilizer is as a part for diesel exhaust aftertreatment regenerating unit, and it plays a part of also very Big, patent publication No. also discloses the uniform mechanism of air-flow for the application for a patent for invention of " CN104912631 ", and it includes gas Uniformer is flowed, but does not disclose the concrete structure of air-flow uniformer, according to scheme commonly used in the prior art, air-flow uniformer The platy structure only with taper is substantially, the effect of the platy structure of the taper is the speed for slowing down flame flow, is prevented Flame flow excessive velocities and the particulate matter PM collected by DPF is not burnt fully and has just passed through DPF device, in short-term processing work In work, the effect of the technical scheme or preferable, but in prolonged processing procedure, the surrounding of DPF device can often go out Existing scale, these scales are due to that the not sufficiently combusted of particulate matter PM accumulates what is produced, and this is due to gas Uniformer is flowed while flame flow is buffered, and can influence the airflow stability of flame flow so that in some position meeting of DPF device The dead angle of burning is produced, under prolonged accumulation, dirt deposition is formed after not sufficiently combusted particulate matter PM accumulations at the dead angle Thing, ultimately results in DPF device Partial Blocking, influences the treatment effect of the exhaust gas post-treatment device of diesel engine.

Utility model content

Technical problem to be solved in the utility model is to overcome the above-mentioned deficiency in the presence of prior art, and provides one Plant diesel exhaust aftertreatment regenerating unit.

The technical scheme in the invention for solving the above technical problem is：A kind of diesel exhaust aftertreatment regeneration dress Put, including heat riser and constant-current stabilizer, the heat riser is located at exhaust emissions end and formed combustion chamber, constant-current stabilizer Between combustion chamber and oxidation catalyst DOC and it is coaxially disposed.

The heat riser includes body, compressed air type atomizer, air supply pipe, closure and igniter, the pipe One end of body and exhaust emissions of diesel engine mouthful connects, and the closure seals the other end of the body, make the body and Exhaust port one closed chamber one of formation；The porcelain bushing of taper, described sleeve pipe and institute are additionally provided with the tubular body State closure to be fixedly connected, and closed chamber two is formed between closure, by described between the chamber one and chamber two The gas outlet connection of sleeve pipe；The compressed air type atomizer and air supply pipe are each passed through closure and connected with the chamber two； The igniter is located at the inside of chamber one and near the gas outlet of described sleeve pipe.

The constant-current stabilizer includes uniform flow chamber and even flow plate, the uniform flow chamber and combustion chamber, and the uniform flow chamber The longitudinal section of entrance point be in isosceles trapezoid, the bore of entrance point is more than the bore of the port of export；The even flow plate is located at described even The port of export of chamber is flowed, and is fixed on by support on the shell of the constant-current stabilizer；The even flow plate is hollow cone structure, The basal diameter of the taper header structure is slightly larger than the port of export bore of the uniform flow chamber, is laid on the perisporium of the even flow plate There are multiple airflow holes and a plurality of drainage trough, the airflow hole is through hole, and the fluting direction of the drainage trough is set along the direction of air-flow Put.

Innovative point of the present utility model is mainly shown as following aspect：, can be directly by liquid using compressed air type atomizer State diesel oil is converted into spray pattern, and atomizing effect is stable, and easily calculates the air capacity that spraying liquid diesel oil is used；By first The mixed atomization gaseous diesel gaseous mixture of step, is mixed, shape again in chamber two with the air entered by air supply pipe Into the gaseous mixture of certain oil-gas ratio, gaseous mixture sprays by gas outlet again, further in the inside of chamber one and the waste gas of diesel engine Mix and light in proportion, formed optimal fuel oil than fuel-air mixture, reach the flame flow of optimum temperature, and pass through ceramic jacket Pipe is combined design with the structure of closure, and to reach preferably protection and sealing effectiveness, air, gaseous state bavin are realized on the whole The mixing control of the accurate ratio of waste gas in oil and diesel engine after treatment device.The same of optimum temperature is reached inside chamber one When, by this kind of conceptual design of constant-current stabilizer, allow to pass through out of airflow hole by a flame flow part for even flow plate, one Part can carry out drainage by drainage trough, and another part is passed through at the housing slot by even flow plate and constant-current stabilizer, finally Play a part of buffering and uniform divided flows flame flow.

Further, the closure of the present utility model is made up of bitumen layer, heat-insulating and sealing circle and metal level successively, institute The outermost layer end that bitumen layer is packaged in the body is stated, described sleeve pipe is fixedly connected with the metal level.Closure uses this kind Design, metal level be in order to be more convenient it is stable be connected with porcelain bushing, heat-insulating and sealing circle is in order to by the heat inside chamber one Amount isolation, bitumen layer is the integral sealing effect of closure in order to better improve.The three-decker is together to form heat-insulated effect The sealing structure that fruit is obvious, sealing effectiveness is good.

Further, described sleeve pipe of the present utility model also includes the shower nozzle that is made of metal material, the shower nozzle with it is described Gas outlet is socketed.Shower nozzle is made of metal material, can be easy to be manufactured into specific shower nozzle shape, is also convenient for and porcelain bushing Gas outlet is connected.

Further, the head of the shower nozzle of the present utility model is set to the nozzle of back taper.Pass through back taper in gaseous mixture When the nozzle of shape sprays, gaseous mixture can be sprayed with horn-like direction, the gas of ejection is easier ignited device and lighted.

Further, the igniter of the present utility model is the firing up rod formed by molybdenum filament or tungsten filament helix. Using molybdenum filament or the firing up rod of tungsten filament helix formation, relative to other igniters, ignition results are more stable, will not be by mixed Close the ejection of gas and the influence such as blow out.

Further, the drainage trough of the present utility model is circular groove.Drainage trough is arranged to circular groove, Relative to square groove, rebound effect when flame flow is contacted with drainage trough, the drainage effect of enhancing drainage trough are effectively reduced Really.

The utility model is compared with the prior art, and is had the advantages that：The utility model is simple in construction, and design is closed Reason, considers not only and the air of injection and diesel oil is carried out to certain ratio mixing, the waste gas of diesel engine also is also served as into mixing A part for gas is accounted for, and is finally realized optimal oil gas blended fuel oil ratio, is reached optimal ignition temperature, and steady by this Device is flowed, the flame flow of the optimum temperature can be entered to row buffering and uniform divided flows to wall flow particulate filters（DPF）, will deposit Particulate matter PM in DPF is burnt out, and reaches higher regeneration effect.

Brief description of the drawings

Fig. 1 is the structural representation of the utility model embodiment.

Fig. 2 is the structural representation of heat riser in the utility model embodiment.

Fig. 3 is the structural representation of even flow plate in the utility model embodiment.

Fig. 4 is the drainage slot structure schematic diagram of even flow plate in the utility model embodiment.

Fig. 5 is A portions partial enlarged drawing in Fig. 2.

Fig. 6 is the uniform flow process schematic of constant-current stabilizer in the utility model embodiment.

In accompanying drawing：1 is exhaust port, and 2 be combustion chamber, and 3 be heat riser, and 31 be body, and 32 be compressed air type mist Change device, 33 be air supply pipe, and 34 be closure, and 341 be bitumen layer, and 342 be heat-insulating and sealing circle, and 343 be metal level, and 35 be igniting dress Put, 36 be chamber one, and 37 be chamber two, and 38 be sleeve pipe, and 381 be gas outlet, and 382 be shower nozzle, and 383 be nozzle, and 4 be that current stabilization is filled Put, 41 be uniform flow chamber, and 42 be even flow plate, and 421 be airflow hole, and 422 be drainage trough, and 423 be groove, and 43 be support, and 5 be DOC, 6 It is pressure sensor for DPF, 7.

Embodiment

Below in conjunction with the accompanying drawings and the utility model is described in further detail by embodiment, following examples are pair It is of the present utility model explanation and the utility model is not limited to following examples.

Referring to Fig. 1-Fig. 5, the present embodiment is a set of diesel engine exhausting after-treatment device for including regenerating unit.It includes bavin Oil machine exhaust gas post-treatment device and regenerating unit, after-treatment device include exhaust port 1, the oxidation catalyst set gradually DOC5 and wall flow particulate filters DPF6, regenerating unit includes heat riser 3 and constant-current stabilizer 4, each device of the present embodiment Between annexation be followed successively by：Exhaust port 1, combustion chamber 2, constant-current stabilizer 4, oxidation catalyst DOC5, wall flow particulate Filter DPF6 is sequentially connected and is coaxially disposed, coupled logical provided with angularly disposed heat riser 3 in the position of combustion chamber 2.

Heat riser 3 includes body 31, compressed air type atomizer 32, air supply pipe 33, closure 34 and igniter 35. Closure 34 is made up of bitumen layer 341, heat-insulating and sealing circle 342 and metal level 343 successively, and bitumen layer 341 is packaged in body 31 Outermost layer end；One end of body 31 is fixed on the shell of combustion chamber 2 to be connected with exhaust emissions of diesel engine mouthful 1, and closure 34 will The other end sealing of body 31, makes body 31 form a closed chamber 1 with combustion chamber 2；Cone is additionally provided with inside body 31 The porcelain bushing 38 of shape, sleeve pipe 38 is fixedly connected with the metal level 343 of closure 34, and forms between closure 34 closed chamber Room 2 37, is connected between chamber 1 and chamber 2 37 by the gas outlet 381 of sleeve pipe 38；Compressed air type atomizer 32 and confession Tracheae 33 is each passed through closure 34 and connected with chamber 2 37；Igniter 35 is located at the inside of chamber 1 and positioned at sleeve pipe 38 Near gas outlet 381, formed by molybdenum filament or tungsten filament helix.

Constant-current stabilizer 4 includes uniform flow chamber 41 and even flow plate 42, and uniform flow chamber 41 is connected with combustion chamber 2, and uniform flow chamber 41 The longitudinal section of entrance point is in isosceles trapezoid, and the bore of entrance point is more than the bore of the port of export；Even flow plate 42 is located at uniform flow chamber 41 The port of export, and be fixed on by support 43 on the shell of constant-current stabilizer 4；Even flow plate 42 is hollow cone structure, the conical head The basal diameter of structure is slightly larger than the port of export bore of uniform flow chamber 41, and multiple airflow holes are laid with the perisporium of even flow plate 42 421 and a plurality of drainage trough 422, airflow hole 421 is through hole, the direction setting of the fluting direction of drainage trough 422 along air-flow, and drainage Groove 422 is circular groove 423.

As preferred embodiment, six airflow holes, 421 groups and three drainages are laid with the perisporium of even flow plate 42 Groove 422, the top of three drainage troughs 422 is communicated, and in intersection provided with an airflow hole 421, each drainage trough 422 is in plane The angle for being on perspective plane is 120 degree.Between each adjacent drainage trough 422, two 421 groups of airflow holes are laid with, often 421 groups of group airflow hole includes four airflow holes 421.

The sleeve pipe 38 of the present embodiment also includes the shower nozzle 382 that metal material is made, and shower nozzle 382 is socketed with gas outlet 381. The head of shower nozzle 382 is set to the nozzle 383 of back taper

The present embodiment also sets band respectively in the import of air supply pipe 33 and the air intlet of compressed air type atomizer 32 There are the air pump one and air pump two of solenoid valve control, the oil inlet end of compressed air type atomizer 32 is pumped using electromagnetic pulse Oil, for the air for controlling to enter from air supply pipe 33, the air that enters from the air intlet of compressed air type atomizer 32 and Into the diesel oil amount of compressed air type atomizer 32.

The working process and principle of the present embodiment are：Whole system be under the control of ECU systems gather engine speed, The COMPREHENSIVE CALCULATINGs such as operating mode situation go out amount of fuel and air capacity, and pressure sensor 7 is provided between constant-current stabilizer 4 and DOC5, works as ECU When system detects internal pressure by pressure sensor 7 and is increased to calibration value, clearing function is automatically turned on, flow is specifically opened It is as follows：

（1）ECU systems control electromagnetic pulse pump work, send into the liquid diesel of a amounts inside atomizer in oil return line, Control air pump one and air pump two to start working simultaneously and be respectively fed to the air of b amounts and c amounts, liquid diesel is first in atomizer The internal air with c amounts is mixed to form after high pressure fog inside penetrating chamber 2 37, then with the sky of the b amounts entered from air supply pipe 33 Gas is mixed, and is sprayed into after mixing through gas outlet 381, nozzle 383 inside chamber 1.

（2）After the signal of ECU systems is obtained, igniter 35（Molybdenum filament or tungsten filament）It is initially powered up heating, temperature moment More than 300 DEG C are reached, moment lights mixed gas, mixed gas now includes the gaseous diesel being atomized, the air being passed through, And the tail gas of diesel emission.It should consider each group deal contained by the mixed gas when calculating amount of fuel and air capacity, With calculate higher fuel oil than fuel-air mixture, reach the flame flow of optimum temperature.

（3）Flame flow sequentially passes through uniform flow chamber 41 from combustion chamber 2 and even flow plate 42 is reached inside DOC5 and DPF6.Such as Fig. 6, Flame flow is slightly converged by the entrance point of uniform flow chamber 41 first, when then by even flow plate 42, and flame flow is divided into three strands of air-flows, First strand is directly passed through by airflow hole 421, and second strand passes through along even flowing chute, and the 3rd burst of meeting is from even flow plate 42 and constant-current stabilizer 4 Housing slot at pass through, at this due to even flow plate 42 basal diameter be slightly larger than uniform flow chamber 41 port of export bore, the 3rd strand Air-flow can be launched between the shell of even flow plate 42 and constant-current stabilizer 4, prevent air-flow from directly passing through from the gap location, by this three strands The uniform flow effect of air-flow, finally causes whole DOC5 and DPF6 temperature rise to reach of the abundant burnt deposit in DOC5 and DPF6 Grain thing PM purpose.

Above example has made more detailed description to the utility model, but these descriptions are not to this practicality New limitation, i.e. the utility model are not limited to the concrete structure and description of above-described embodiment.Protection of the present utility model Scope includes those obvious conversion or replacement and remodeling to those skilled in the art.

Claims (6)

1. a kind of diesel exhaust aftertreatment regenerating unit, including heat riser and constant-current stabilizer, the heat riser are located at tail Gas discharge end and formed combustion chamber, constant-current stabilizer are located between combustion chamber and oxidation catalyst DOC and are coaxially disposed, its It is characterised by：The heat riser includes body, compressed air type atomizer, air supply pipe, closure and igniter, the pipe One end of body and exhaust emissions of diesel engine mouthful connects, and the closure seals the other end of the body, make the body and Exhaust port one closed chamber one of formation；The porcelain bushing of taper, described sleeve pipe and institute are additionally provided with the tubular body State closure to be fixedly connected, and closed chamber two is formed between closure, by described between the chamber one and chamber two The gas outlet connection of sleeve pipe；The compressed air type atomizer and air supply pipe are each passed through closure and connected with the chamber two； The igniter is located at the inside of chamber one and near the gas outlet of described sleeve pipe；The constant-current stabilizer include uniform flow chamber and Even flow plate, the uniform flow chamber and combustion chamber, and the longitudinal section of the entrance point of the uniform flow chamber is in isosceles trapezoid, entrance point Bore be more than the port of export bore；The even flow plate is located at the port of export of the uniform flow chamber, and is fixed on by support described On the shell of constant-current stabilizer；The even flow plate is hollow cone structure, and the basal diameter of the taper header structure is slightly larger than described The port of export bore of uniform flow chamber, is laid with multiple airflow holes and a plurality of drainage trough, the gas on the perisporium of the even flow plate Discharge orifice is through hole, and the direction of the fluting direction of the drainage trough along air-flow is set.

2. diesel exhaust aftertreatment regenerating unit according to claim 1, it is characterised in that：The closure successively by Bitumen layer, heat-insulating and sealing circle and metal level composition, the bitumen layer are packaged in the outermost layer end of the body, described sleeve pipe and institute Metal level is stated to be fixedly connected.

3. diesel exhaust aftertreatment regenerating unit according to claim 1, it is characterised in that：Described sleeve pipe also includes gold The shower nozzle that category material is made, the shower nozzle is socketed with the gas outlet.

4. diesel exhaust aftertreatment regenerating unit according to claim 3, it is characterised in that：The head of the shower nozzle is set For the nozzle of back taper.

5. diesel exhaust aftertreatment regenerating unit according to claim 1, it is characterised in that：The igniter be by Molybdenum filament or the firing up rod of tungsten filament helix formation.

6. diesel exhaust aftertreatment regenerating unit according to claim 1, it is characterised in that：The drainage trough is circular arc Connected in star.