CN208364217U - A kind of selective catalytic reduction device suitable for boat diesel engine - Google Patents

Abstract

The utility model discloses a kind of selective catalytic reduction devices suitable for boat diesel engine, including exhaust pipe entrance branch, static mixer and exhaust pipe supervisor；The connection of the exhaust pipe of exhaust pipe entrance branch lower end and diesel engine, air inlet pipe upper end are connect with static mixer lower end, and the static mixer upper end and exhaust pipe supervisor connect；Urea nozzle is provided on the exhaust pipe entrance branch side wall；Spiral deflector is disposed with along air current flow direction in the exhaust pipe supervisor, expands flowing plate and catalyst carrier, wherein spiral deflector face static mixer upper end outlet is arranged, and expands the tapered diffusion type of flowing plate and be directed toward catalyst carrier from spiral deflector.The utility model cancels SCR reactor, carries out denitration process using existing exhaust pipe, has not only saved cost, while installation space is also greatly saved, solved the problems, such as SCR system limited space.

Description

A kind of selective catalytic reduction device suitable for boat diesel engine

Technical field

The utility model relates to ship pollution discharge processing technology field more particularly to a kind of selections suitable for boat diesel engine Property catalytic reduction device.

Background technique

Currently, ship has become China coast, the along the river regional main source of atmospheric pollution.It is supervised according to national environmental protection portion The data at control center, the ship in Chinese Port berthing in 2013 discharge 58.8 ten thousand tons of sulfur dioxide altogether, and it is total to account for about whole nation discharge The 8.4% of amount, accounts for about the 11.3% of national total emission volumn by 27.8 ten thousand tons of yard craft nitrogen oxide emission.International Maritime group " MARPOL 73/78 " pact of IMO promulgation is knitted, the ship emission request from January 1st, 2016 in emission control area reaches To III discharge standard of Tier, stringent limitation is carried out to harmful components discharge in marine exhaust, therefore carry out ship atmosphere pollution Control technology is extremely urgent.According to current technology level, the emission-reduction technology for relying solely on diesel engine itself has been difficult to meet The standard of Tier III, this means that diesel engine must realize this target by post-processing technology.In NOx post-processing technology In, SCR is acknowledged as most mature, effective measures, has obtained being widely recognized as international community.

Urea cabinet stored urea aqueous solution, SCR reactor used in ship will be generally used in SCR system peculiar to vessel It is larger with urea cabinet body product, it is reported that, SCR system size and diesel engine require biggish space, and on ship can be diesel oil The space that machine and SCR reactor provide is extremely limited, and which results in the difficult to install of SCR system, greatly limit SCR system Application.

Utility model content

Purpose of the utility model is to overcome the deficiencies of the above prior art and provide a kind of suitable for boat diesel engine Selective catalytic reduction device is adapted as gas exhaust piping that replace SCR reactor, and spiral is installed inside gas exhaust piping Deflector expands flowing plate and catalytic component based on vanadium carrier, and it is anti-just to can be carried out selective catalytic reduction inside gas exhaust piping since then It answers, under conditions of guaranteeing to can be carried out normal reaction, also improves reaction efficiency, reduce device the space occupied, save Cost.

To achieve the above object, the utility model adopts the following technical solutions:

A kind of selective catalytic reduction device suitable for boat diesel engine, including exhaust pipe entrance branch, static mixing Device and exhaust pipe supervisor；Wherein

The connection of the exhaust pipe of exhaust pipe entrance branch lower end and diesel engine, and air inlet pipe upper end and static mixer lower end connect It connects, static mixer upper end and exhaust pipe supervisor connect；

Urea nozzle is provided on the exhaust pipe entrance branch side wall；

Spiral deflector is disposed with along air current flow direction in the exhaust pipe supervisor, expands flowing plate and catalyst load Body, wherein spiral deflector face static mixer upper end outlet is arranged, and expands the tapered diffusion type of flowing plate from spiral deflector It is directed toward catalyst carrier.

Preferably, the exhaust pipe entrance branch is provided with multiple groups, and accordingly static mixer is also equipped with multiple groups, and every Group static mixer is correspondingly arranged on one group of spiral deflector in exhaust pipe supervisor, expands flowing plate and catalyst carrier.

Preferably, the urea nozzle is connected by pipeline with urea cabinet, is furnished between the urea nozzle and urea cabinet Urea control unit is equipped with NOx sensor in exhaust pipe supervisor, and the NOx sensor is controlled by route and urea Unit is connected.

Preferably, the NOx sensor is provided with multiple groups along air current flow direction in exhaust pipe supervisor, such as corresponds to quiet The group number of state mixer configures one by one.

Preferably, the catalyst carrier Ceramics material, high temperature resistant, and have for selective catalytic reduction reaction There is certain facilitation.

Preferably, the tail portion of the exhaust pipe supervisor connects turbine, and the turbine is connect with aerostatic press, here, exhaust pipe The tail gas of supervisor's discharge, which provides turbo-power, makes its rotation, and turbine rotation drives aerostatic press work, compressed air.

Preferably, the exhaust pipe supervisor is configured with cleaning systems, and the cleaning systems include blower, and the blower passes through Pipeline is connected with the catalyst carrier in exhaust pipe supervisor.

Selective catalytic reduction device provided by the utility model suitable for boat diesel engine cancels SCR reactor, benefit Denitration process is carried out with existing exhaust pipe, has not only saved cost, while installation space is also greatly saved, solves SCR system The problem of limited space of uniting.In addition, spiral deflector and expanding the installation of flowing plate so that NOx and NH in exhaust gas₃It mixes more equal It is even, it is more advantageous to the progress of reaction, improves the denitration efficiency of reaction.Specifically, the setting of spiral deflector extends mixing The flow path of gas, the NH for enabling the NOx in gaseous mixture to decomposite with aqueous solution of urea₃Reach and is sufficiently mixed；Expand setting for flowing plate Setting makes gaseous mixture can be uniformly distributed in catalyst carrier cross section everywhere, guarantees that gaseous mixture comes into full contact with catalytic component based on vanadium, So that catalytic reduction reaction is more thorough；Catalyst carrier is provided with multiple groups, when the gaseous mixture that previous group enters passes through previous group vanadium The gaseous mixture that can enter with later group when not reacting completely after base catalyst passes through spiral deflector and expands after mixing again flows Plate carries out expansion stream, unreacted NH₃Be contacted again catalytic component based on vanadium it is subsequent it is continuous react, NOx sensor can moment detection row The interior concentration of NOx everywhere of tracheae supervisor simultaneously transmits signal to urea control unit, and urea control unit can be real-time after receiving signal The amount of injection for adjusting urea, to make NOx and NH₃Reach best catalytic reduction reaction proportion, while can also prevent NH₃It is excessive and Leakage is caused to increase cost with tail gas discharge.

Detailed description of the invention

Fig. 1 is the structural schematic diagram for the selective catalytic reduction device that the utility model is suitable for boat diesel engine.

Wherein: 1- urea cabinet；2- urea control unit；3- urea nozzle；4- exhaust pipe entrance branch；5- static mixing Device；6- exhaust pipe supervisor；7- spiral deflector；8- expands flowing plate；9- catalyst carrier；10- catalytic component based on vanadium；11-NOx sensing Device；12- blower；13- turbine；14- compressor.

Specific embodiment

The present invention will be further described with reference to the accompanying drawings and examples.

As shown in Figure 1, a kind of selective catalytic reduction device suitable for boat diesel engine, including exhaust pipe entrance branch 4, static mixer 5 and exhaust pipe supervisor 6；Wherein

The connection of the exhaust pipe of 4 lower end of exhaust pipe entrance branch and diesel engine, and 4 upper end of exhaust pipe entrance branch and static state are mixed The connection of 6 lower end of clutch, 5 upper end of static mixer are connect with exhaust pipe supervisor 6；

Urea nozzle 3 is provided on 4 side wall of exhaust pipe entrance branch；

Spiral deflector 7 is disposed with along air current flow direction in the exhaust pipe supervisor 6, expands flowing plate 8 and catalysis Agent carrier 9, wherein 7 face static mixer of spiral deflector, 6 upper end outlet is arranged, and expands the tapered diffusion type of flowing plate 8 from spiral shell It revolves deflector 7 and is directed toward catalyst carrier 9.

Preferably, the exhaust pipe entrance branch 4 is provided with multiple groups, and accordingly static mixer 6 is also equipped with multiple groups, and Every group of static mixer 6 is correspondingly arranged on one group of spiral deflector 7 in exhaust pipe supervisor 6, expands flowing plate 8 and catalyst carrier 9, I.e. accordingly spiral deflector 7, expansion flowing plate 8 and catalyst carrier 9 are also equipped with multiple groups.

Preferably, the urea nozzle 3 is connected by pipeline with urea cabinet 1, between the urea nozzle 3 and urea cabinet 1 Equipped with urea control unit 2, NOx sensor 11 is installed in the exhaust pipe supervisor 6, the NOx sensor 11 passes through route It is connected with urea control unit 2.

Preferably, the NOx sensor 11 is provided with multiple groups along air current flow direction in exhaust pipe supervisor 6, such as right The group number of static mixer 6 is answered to configure one by one.

Preferably, the 10 Ceramics material of catalyst carrier, high temperature resistant, and for selective catalytic reduction reaction With certain facilitation.

Preferably, the tail portion of the exhaust pipe supervisor 6 connects turbine 13, and the turbine 13 is connect with aerostatic press 14, This, the tail gas of 6 discharge of exhaust pipe supervisor, which provides 13 power of turbine, makes its rotation, and the rotation of turbine 13 drives aerostatic press 14 to work, pressure Contracting air.

Preferably, the exhaust pipe supervisor 6 is configured with cleaning systems, and the cleaning systems include blower 12, the blower 12 are connected by pipeline with the catalyst carrier 9 in exhaust pipe supervisor 6.

Selective catalytic reduction device provided by the utility model suitable for boat diesel engine, when work:

Aqueous solution of urea from urea cabinet 1 under the control action of urea control unit 2 is sprayed into from urea nozzle 3 to be arranged In tracheal entrance branch pipe 4, and the high-temp waste gas from Diesel Engine Exhaust Pipe is discharged into exhaust pipe from 4 lower end of exhaust pipe entrance branch In entrance branch 4, the direction of flow of the injection direction of aqueous solution of urea and high-temp waste gas is substantially in 90 degree of distributions, Ke Yichong at this time Tap touching mixing, that is, realize the premixing of the two；

Aqueous solution of urea is sufficiently mixed concurrent unboiled water under the conduction of heat of high-temp waste gas when flowing through static mixer 6 Solution generates NH3；In the special structural units that this static mixer has the level of disruption of high-temp waste gas is reinforced, Make the NOx and NH in high-temp waste gas in turn₃Gas mutually mixes；

Gaseous mixture is reached after static mixer 6 in exhaust pipe supervisor 6 and successively by spiral deflector 7 and expansion stream It is contacted at catalyst carrier 9 with cellular catalytic component based on vanadium 10 after plate 8 and catalysis reduction occurs under high exhaust temperatures effect Reaction enables NOx and aqueous solution of urea in gaseous mixture to decompose here, spiral deflector 7 extends the flow path of gaseous mixture NH out₃Reach and is sufficiently mixed；Expanding flowing plate 8 makes gaseous mixture can be uniformly distributed in 9 cross section of catalyst carrier everywhere, guarantees mixed It closes gas to come into full contact with catalytic component based on vanadium 10, so that catalytic reduction reaction is more thorough；(250 DEG C of exhaust gas temperature in exhaust pipe supervisor 6 ~400 DEG C) it is higher, meet condition needed for reacting, the flowing in exhaust pipe supervisor 6 of such gaseous mixture can occur selectivity and urge Change reduction reaction, the NOx in gaseous mixture is reduced to N₂And water；Catalyst carrier 9 is provided with multiple groups, when what previous group entered mixes The gaseous mixture that closing can enter when gas does not react completely after previous group catalytic component based on vanadium 10 with later group is worn after mixing again Cross spiral deflector 7 and expand flowing plate 8 and carry out expansion stream, unreacted NH3 be contacted again catalytic component based on vanadium it is subsequent it is continuous react, NOx sensor 11 can detect exhaust pipe the moment and be responsible in 6 the concentration of NOx everywhere and transmit signal, urine to urea control unit 2 Plain control unit 2 can adjust in real time the amount of injection of urea after receiving signal, to make NOx and NH₃It is anti-to reach best catalysis reduction It should match, while can also prevent NH₃Excessively leakage is caused to increase cost with tail gas discharge；

Tail gas after reaction enters turbine 13 and provide 13 power of turbine after exhaust pipe is responsible for the discharge of 6 tail portions makes its turn Dynamic, turbine 13 rotates and then compressor 14 is driven to work, and 14 compressed air of compressor enters cylinder of diesel engine, promotes fuel oil combustion It burns, the gas after burning enters exhaust pipe branch pipe 4.

Finally, cleaning systems are configured with to exhaust pipe supervisor 6 in order to keep 6 cleaning of exhaust pipe supervisor not to be contaminated, it can Exhaust pipe supervisor 6 is cleared up in periodic operation, i.e., is blown by 12 compressed air of blower and be adhered to catalysis in exhaust pipe supervisor 6 It is discharged after flue dust on agent carrier 9 with exhaust.

In the description of the present invention, it should be understood that term " on ", "lower", " tail ", "inner", "outside" etc. indicate Orientation or positional relationship be to be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description the utility model and letter Change description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construct and Operation, therefore should not be understood as limiting the present invention.

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 selective catalytic reduction device suitable for boat diesel engine, which is characterized in that including exhaust pipe entrance branch, Static mixer and exhaust pipe supervisor；The connection of the exhaust pipe of exhaust pipe entrance branch lower end and diesel engine, the exhaust pipe Entrance branch upper end is connect with static mixer lower end, and the static mixer upper end and exhaust pipe supervisor connect；The exhaust Urea nozzle is provided on pipe entrance branch side wall；Spiral is disposed with along air current flow direction in the exhaust pipe supervisor Deflector expands flowing plate and catalyst carrier, and wherein spiral deflector face static mixer upper end outlet is arranged, and expands flowing plate and be in Taper diffusion type is directed toward catalyst carrier from spiral deflector.

2. being suitable for the selective catalytic reduction device of boat diesel engine as described in claim 1, which is characterized in that the row Tracheal entrance branch pipe is provided with multiple groups, and accordingly static mixer is also equipped with multiple groups, and every group of static mixer is in exhaust pipe It is correspondingly arranged on one group of spiral deflector in supervisor, expands flowing plate and catalyst carrier.

3. being suitable for the selective catalytic reduction device of boat diesel engine as described in claim 1, which is characterized in that the urine Plain nozzle is connected by pipeline with urea cabinet, is furnished with urea control unit between the urea nozzle and urea cabinet.

4. being suitable for the selective catalytic reduction device of boat diesel engine as claimed in claim 3, which is characterized in that the row NOx sensor is installed, the NOx sensor is connected by route with urea control unit in tracheae supervisor.

5. being suitable for the selective catalytic reduction device of boat diesel engine as claimed in claim 4, which is characterized in that described NOx sensor is provided with multiple groups along air current flow direction in exhaust pipe supervisor.

6. being suitable for the selective catalytic reduction device of boat diesel engine as described in claim 1, which is characterized in that described to urge Agent carrier Ceramics material.

7. being suitable for the selective catalytic reduction device of boat diesel engine as described in claim 1, which is characterized in that the row The tail portion of tracheae supervisor connects turbine, and the turbine is connect with aerostatic press.

8. such as the described in any item selective catalytic reduction devices suitable for boat diesel engine of claim 1-7, feature exists In the exhaust pipe supervisor is configured with cleaning systems, and the cleaning systems include blower, and the blower passes through pipeline and exhaust pipe Catalyst carrier in supervisor is connected.