CN110295986A - A kind of diesel engine exhaust gas treatment device and method - Google Patents
A kind of diesel engine exhaust gas treatment device and method Download PDFInfo
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- CN110295986A CN110295986A CN201910593646.8A CN201910593646A CN110295986A CN 110295986 A CN110295986 A CN 110295986A CN 201910593646 A CN201910593646 A CN 201910593646A CN 110295986 A CN110295986 A CN 110295986A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/30—Arrangements for supply of additional air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/04—Sulfur or sulfur oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Analytical Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to a kind of diesel exhaust processing unit and methods, belong to tail gas disposal technique field.Diesel engine exhaust gas treatment device provided by the invention, including data acquisition device, control core, Dry desulfurization device and SCR reactor；Urea box, exhaust gas temperature sensor and temperature control equipment are disposed between Dry desulfurization device and SCR reactor, the outlet of urea box is connected with exhaust emission pipe；Exhaust gas temperature sensor is set in exhaust emission pipe；The gas outlet of temperature control equipment is connected with exhaust emission pipe, and the air inlet of temperature control equipment is connected with air storage tank；SCR temperature sensor is provided in SCR reactor；Data acquisition device and exhaust gas temperature sensor and SCR temperature sensor communicate to connect；Control core and temperature control equipment and data acquisition device communicate to connect.Device provided by the invention solves the problems, such as SCR catalyst poisoning and diesel engine vent gas wide temperature range, and device is simple and energy consumption is low.
Description
Technical field
The present invention relates to tail gas disposal technique fields, and in particular to a kind of diesel exhaust processing unit and method.
Background technique
Diesel engine has the advantages that fuel economy is good, the thermal efficiency is high, high reliablity and long service life, extensive
It is applied to the every field such as steamer, heavy-duty car, agricultural tools.But the emission problem of diesel engine is also brought very to the mankind
Big harm.The predominant emissions of diesel engine have nitrogen oxides (NOx) and particle, selective catalytic reduction (SCR) technology recognized
For the available strategy for being nitrogen oxides in reduction diesel engine vent gas.SCR technology in diesel engine vent gas mainly by being passed through urine
Element, makes urea generate ammonia through pyrohydrolysis at high temperature, and ammonia is sent out as reducing agent with nitrogen oxides under the effect of the catalyst
Conversion of nitrogen oxides is harmless nitrogen and water by raw catalytic reduction reaction.Wherein, the normal operation of SCR reactor is to diesel oil
The discharge of machine is played the role of vital.
But the exhaust temperature ranges of diesel engine are too low, and delivery temperature is caused not to be able to satisfy the condition of catalytic reduction reaction.
Currently, the method for commonly improving delivery temperature is using the method heated outside turbocharger postposition and SCR reactor.Its
In, turbocharger postposition can prevent the reduction of turbocharging final vacuum temperature, so that into the delivery temperature in SCR reactor
Meet catalysis reaction to carry out；But due to turbocharger postposition, so that turbocharger reduces the pressurization of air inlet, drop
Low air inflow, will be greatly reduced the acting ability of diesel engine；The method heated outside SCR reactor, so that SCR reactor temperature
Degree rises, and to guarantee the progress of catalytic reduction reaction, but the temperature of tail gas is higher than the temperature or SCR reaction of SCR catalysis reaction
When the temperature that device can bear, outside heating method can not effectively cool down to the high-temperature tail gas in SCR reactor, cannot make
SCR reactor is obtained to work in high temperature range.
Further, since containing higher element sulphur in the fuel oil of diesel engine, so that SO in diesel engine vent gas2Concentration over-standard,
SCR catalyst can be made to be poisoned during carrying out catalytic reduction reaction, influence the removal effect of nitrogen oxides in diesel engine vent gas.
Summary of the invention
The purpose of the present invention is to provide a kind of diesel engine exhaust gas treatment device and methods.Using diesel oil provided by the invention
After tail Flash Gas Compression Skid System handles diesel engine vent gas, sulphur and amount of nitrogen oxides are low in tail gas, efficiently solve diesel oil
High sulfur content causes SCR catalyst to be poisoned in tail gas, while also solving the problems, such as diesel engine vent gas wide temperature range,
Device is simple, energy consumption is low and at low cost.
The present invention provides a kind of diesel engine exhaust gas treatment device, including data acquisition device 11, control core 12 and
The Dry desulfurization device 2 and SCR reactor 10 connected through exhaust emission pipe；
Urea box 3, delivery temperature sensing are disposed between the Dry desulfurization device 2 and the SCR reactor 10
Device 9 and temperature control equipment 5, wherein the outlet of the urea box 3 is connected with the exhaust emission pipe；The delivery temperature
Sensor 9 is set in the exhaust emission pipe；The gas outlet of the temperature control equipment 5 and the exhaust emission pipe phase
Even, the air inlet of the temperature control equipment 5 is connected with air storage tank 7；
SCR temperature sensor 13 is provided in the SCR reactor 10；
The data acquisition device 11 is communicated with the exhaust gas temperature sensor 9 and the SCR temperature sensor 13 respectively
Connection；
The control core 12 is communicated to connect with the temperature control equipment 5 and the data acquisition device 11 respectively.
Preferably, the temperature control equipment 5 includes airflow pipe, temperature control sleeve and electric heater, the temperature control
Sleeve is arranged on the outside of the airflow pipe, and the electric heater is set to be set forth in airflow pipe and the temperature control
Between sleeve, the electric heater is fixed on the temperature control sleeve, and the electric heater is connect with the airflow pipe.
It preferably, further include electrically-controlled valve 4, the electrically-controlled valve 4 is set to temperature control equipment 5 and the exhaust emission pipe
Between pipeline in, the electrically-controlled valve 4 is communicated to connect with control core 12.
It preferably, further include air-flow control device 6, the air-flow control device 6 is set to temperature control dress
It sets on the pipeline between 5 and air storage tank 7, the air-flow control device 6 and 11 communication link of data acquisition device
It connects.
Preferably, further include extraction flow measure and control device 1, the extraction flow measure and control device 1 through exhausting waste gas pipeline with
The air inlet of Dry desulfurization device 2 is connected；The extraction flow measure and control device 1 is communicated to connect with the data acquisition device 11.
It preferably, further include SO2Concentration sensor 8, the SO2Concentration sensor 8 is set to urea box 3 and delivery temperature
In exhausting waste gas pipeline between sensor 9, the SO2Concentration sensor 8 and data acquisition device 11 communicate to connect.
The present invention provides the sides of the diesel engine exhaust gas treatment device processing diesel engine vent gas by adopting the above technical scheme
Method, comprising the following steps:
Diesel engine vent gas is passed through in Dry desulfurization device 2 and carries out desulfurization process, obtains first gas；
The first gas is mixed with the urea in urea box 3, obtains second gas；
The temperature of the second gas is adjusted to scheduled temperature using the air in air storage tank 7, in catalyst
It is discharged after carrying out SCR catalysis reaction under effect in SCR reactor 10.
Preferably, the reagent that the desulfurization process uses includes iron oxide or calcium oxide.
Preferably, the catalyst includes metal oxide catalyst, molecular sieve catalyst, natural crystal catalyst,
V2O5-WO3/TiO2-SiO2/ cordierite catalyst, Cu/SAPO-34/ cordierite catalyst and Cu/SSZ-13/ cordierite catalyst
One or more of.
Preferably, the temperature of the SCR catalysis reaction is 300~400 DEG C.
The present invention provides a kind of diesel engine exhaust gas treatment device, including data acquisition device 11, control core 12 and
The Dry desulfurization device 2 and SCR reactor 10 connected through exhaust emission pipe；The Dry desulfurization device 2 and SCR reaction
Urea box 3, exhaust gas temperature sensor 9 and temperature control equipment 5 are disposed between device 10, wherein the urea box 3 goes out
Mouth is connected with the exhaust emission pipe；The exhaust gas temperature sensor 9 is set in the exhaust emission pipe；The temperature
The gas outlet of control device 5 is connected with the exhaust emission pipe, and the air inlet of the temperature control equipment 5 is connected with air storage
Deposit case 7；SCR temperature sensor 13 is provided in the SCR reactor 10；The data acquisition device 11 respectively with the exhaust
Temperature sensor 9 and the SCR temperature sensor 13 communication connection；The control core 12 respectively with the temperature control equipment
5 and the data acquisition device 11 communicate to connect.Using diesel engine exhaust gas treatment device provided by the invention to diesel engine vent gas
After being handled, sulphur and amount of nitrogen oxides are low in tail gas, efficiently solve high sulfur content in diesel engine vent gas and SCR is caused to be catalyzed
The problem of agent is poisoned, the diesel engine vent gas wide suitable for temperature ranges, device is simple, energy consumption is low and at low cost.Embodiment
Test result shows that the denitration efficiency of the diesel engine exhaust gas treatment device improved using the present invention processing diesel engine vent gas is higher than
95%, meet the job requirement of SCR reactor.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of diesel engine exhaust gas treatment device；In figure, 1- extraction flow measure and control device, 2- dry method is removed
Sulphur device, 3- urea box, 4- electrically-controlled valve, 5- temperature control equipment, 6- air-flow control device, 7- air storage tank, 8-SO2
Concentration sensor, 9- exhaust gas temperature sensor, 10-SCR reactor, 11- data acquisition device, 12- control core, 13-SCR temperature
Spend sensor.
Specific embodiment
The present invention provides a kind of diesel engine exhaust gas treatment device, including data acquisition device 11, control core 12 and
The Dry desulfurization device 2 and SCR reactor 10 connected through exhaust emission pipe；
Urea box 3, delivery temperature sensing are disposed between the Dry desulfurization device 2 and the SCR reactor 10
Device 9 and temperature control equipment 5, wherein the outlet of the urea box 3 is connected with the exhaust emission pipe；The delivery temperature
Sensor 9 is set in the exhaust emission pipe；The gas outlet of the temperature control equipment 5 and the exhaust emission pipe phase
Even, the air inlet of the temperature control equipment 5 is connected with air storage tank 7；
SCR temperature sensor 13 is provided in the SCR reactor 10；
The data acquisition device 11 is communicated with the exhaust gas temperature sensor 9 and the SCR temperature sensor 13 respectively
Connection；
The control core 12 is communicated to connect with the temperature control equipment 5 and the data acquisition device 11 respectively.
As an embodiment of the present invention, diesel engine exhaust gas treatment device provided by the invention, including exhaust stream measure
Device 1 is controlled, the extraction flow measure and control device 1 is connected through exhausting waste gas pipeline with diesel engine.In the present invention, the exhaust stream
Measurement and control device is measured in real time the flow of diesel engine vent gas.The present invention does not have special limit for the model of the diesel engine
It is fixed.As an embodiment of the present invention, the diesel engine is preferably marine diesel, and the model of the diesel engine is preferably
4102 types.
Diesel engine exhaust gas treatment device provided by the invention, including Dry desulfurization device 2, the Dry desulfurization device 2
Air inlet is connected through exhausting waste gas pipeline with the gas outlet of the extraction flow measure and control device 1.In the present invention, the dry method is removed
Sulphur device 2 is used to carry out diesel engine vent gas except sulphuring treatment is (in the present invention, by gained after diesel engine vent gas progress desulfurization process
Gas is known as first gas), by removing sulphuring treatment, the sulfur content in diesel engine vent gas can be substantially reduced, to avoid diesel oil
Sulfur content in tail gas excessively high the problem of causing subsequent SCR catalysis reaction used catalyst poisoning.
Diesel engine exhaust gas treatment device provided by the invention includes urea box 3, the outlet of the urea box 3 and the exhaust gas
Discharge tube is connected.In the present invention, the effect of the urea box 3 is stored urea, and when in use, urea is injected into exhaust gas
It is decomposed into ammonia in exhaust pipe, then mixes and (in the present invention, will with the first gas come out from Dry desulfurization device 2
Gained gas is known as second gas after first gas is mixed with ammonia).Present invention spy no for the spray regime of the urea
It is different to limit, using spray regime well known in the art.
As an embodiment of the present invention, diesel engine exhaust gas treatment device provided by the invention, including SO2Concentration sensing
Device 8, the SO2Concentration sensor 8 is set in the exhausting waste gas pipeline between urea box 3 and exhaust gas temperature sensor 9.At this
In invention, the SO2Concentration sensor 8 is to SO in the second gas2Concentration be measured in real time.
Diesel engine exhaust gas treatment device provided by the invention includes exhaust gas temperature sensor 9, the exhaust gas temperature sensor 9
It is set in the exhaust emission pipe.In the present invention, the exhaust gas temperature sensor 9 to the temperature of the second gas into
Row real-time detection.
Diesel engine exhaust gas treatment device provided by the invention includes temperature control equipment 5 and air storage tank 7, the temperature
The gas outlet of control device 5 is connected with the exhaust emission pipe, and the air inlet of the temperature control equipment 5 is connected with air storage
Deposit case 7.As an embodiment of the present invention, the temperature control equipment 5 includes that airflow pipe, temperature control sleeve and electricity add
Hot device, the temperature control sleeve are arranged on the outside of the airflow pipe, and the electric heater is set to be set forth in air delivery
Between pipeline and the temperature control sleeve, the electric heater is fixed on the temperature control sleeve, the electric heater and the sky
The connection of letter shoot road.As an embodiment of the present invention, the air storage tank 7 includes storage cylinder, valve and escape pipe.
In the present invention, enough air are stored in the storage cylinder 7, the temperature control equipment 5 is to from the air storage tank 7
In the air that transfers out be heated or not heated, to guarantee the temperature of the mixed gas of air and the second gas after heating
Degree reaches scheduled temperature, and then guarantees being normally carried out for SCR catalysis reaction.
As an embodiment of the present invention, diesel engine exhaust gas treatment device provided by the invention includes electrically-controlled valve 4 and sky
Air-flow amount control device 6, the electrically-controlled valve 4 are set in the pipeline between temperature control equipment 5 and the exhaust emission pipe,
The air-flow control device 6 is set on the pipeline between temperature control equipment 5 and air storage tank 7.In the present invention,
The air-flow control device 6 is transmitted to the sky in the exhaust emission pipe for air storage tank 7 described in real-time detection
The flow of gas.In the present invention, the electrically-controlled valve 4 is preferably electronics electrically-controlled valve, and the electrically-controlled valve 4 enters described give up for controlling
The amount of air in gas discharge tube.
Diesel engine exhaust gas treatment device provided by the invention includes SCR reactor 10 and SCR temperature sensor 13, described
SCR temperature sensor 13 is provided in SCR reactor 10.In the present invention, the SCR reactor 10 is specially NOxSelectivity
Catalytic reduction device, for carrying out SCR catalysis reaction, the SCR temperature sensor 13 is for real-time detection SCR catalysis reaction
Temperature.
Diesel engine exhaust gas treatment device provided by the invention includes data acquisition device 11 and control core 12, the data
Acquisition device 11 and the extraction flow measure and control device 1, SO2Concentration sensor 8, exhaust gas temperature sensor 9, air flow control
Device 6 and SCR temperature sensor 13 communicate to connect；Control core 12 and the data acquisition device 11, temperature control equipment 5 and
Electrically-controlled valve 4 communicates to connect.As an embodiment of the present invention, the data acquisition device 11 includes data collecting card and fixation
Device, for the fixed device for fixing the data collecting card, the effect of the data collecting card is to collect exhaust stream respectively
Amount, SO2Concentration, delivery temperature, air mass flow, the data of SCR catalytic reaction temperature, control core 12 count the data obtained
Point counting analysis, controls the working condition of the temperature control equipment 5 and electrically-controlled valve 4.
The present invention provides a kind of methods of diesel engine vent gas processing, comprising the following steps:
Diesel engine vent gas is passed through in Dry desulfurization device 2 and carries out desulfurization process, obtains first gas；
The first gas is mixed with the urea in urea box 3, obtains second gas；
The temperature of the second gas is adjusted to scheduled temperature using the air in air storage tank 7, in catalyst
It is discharged after carrying out SCR catalysis reaction under effect in SCR reactor 10.
Diesel engine vent gas is passed through in Dry desulfurization device 2 and carries out desulfurization process by the present invention, obtains first gas.In this hair
In bright, the ingredient of the diesel engine vent gas is preferably NOX, HC, CO, carbon soot particles and CO2, wherein NOXAbout including volume fraction
The NO that NO and volume fraction for 90% are about 5%2.In the present invention, the emission behaviour of the diesel engine vent gas is by the row
Air-flow measurement and control device 1 is detected.The present invention is not particularly limited the emission behaviour of the diesel engine vent gas, according to bavin
The difference of workmanship speed causes diesel engine vent gas extraction flow different under oil machine difference operating condition, (i.e. different rotating speeds under each operating condition
With the collocation of load) there is stable state, diesel engine vent gas has accordingly stable extraction flow, generally decision diesel engine vent gas
The parameter of extraction flow size is engine displacement, and the spatial summation that engine displacement is formed with all pistons of engine has
It closes.Preferably, the mass flow of the diesel engine vent gas be 74964kg/h, density 1.63kg/m3, NOXConcentration of emission be
587.3ppm；Control core 12 carries out calculating analysis to diesel engine vent gas data, obtains NOXDischarge amount be preferably 38kg/h.
Control core 12 is according to NOXEmission amount calculation needed for urea dosage.As an embodiment of the present invention, the diesel engine
The emission behaviour of tail gas be flow be 74964kg/h, density 1.63kg/m3, volume flow 46000m3/ h, NOXDischarge
Concentration is 587.3ppm, and control core 12 calculate analyzing to diesel engine vent gas data obtains NOXDischarge amount be 38kg/h,
The dosage of the urea liquid of 32.5wt% is 111kg/h.
In the present invention, reagent used in carrier and desulfurization process is preferably included in the Dry desulfurization processing unit 2.?
In the present invention, reagent used in the desulfurization process preferably includes iron oxide or calcium oxide, more preferably iron oxide.In the present invention
In, the carrier preferably includes cordierite, and the structure of the cordierite is preferably honeycomb structure.In the present invention, described de-
The SO the purpose is to reduce the sulfur content in the first gas, in the first gas of sulphuring treatment2Concentration preferably works as temperature
At≤300 DEG C, SO2Concentration is less than 30mg/m3, when temperature is greater than 300 DEG C, SO2Concentration is less than 500mg/m3, work as SO2Concentration mistake
Gao Shi replaces reagent used in the desulfurization process in Dry desulfurization device 2, avoids SO2Excessive concentration leads to catalyst
Poisoning.
After obtaining first gas, the present invention mixes the first gas with the urea in urea box 3, obtains the second gas
Body.In the present invention, the urea uses preferably in the form of aqueous solution of urea, concentration of the present invention for the aqueous solution of urea
It is not particularly limited, is well known concentration using ability, it is specific such as 32.5wt%.In the present invention, the urea liquid
In urea and the first gas in NOXMass ratio be preferably 0.9~1.2:1, more preferably 1.053:1.Due to row
The constantly concentration of variation and nitrogen oxides of throughput also changes constantly, the dosage and extraction flow and nitrogen of aqueous solution of urea
The calculated relationship of oxide concentration are as follows:
M=1.035 × 10-4AB/C (kg/h),
Wherein, M is the penetrating flow of aqueous solution of urea, unit kg/h；A is diesel engine vent gas mass flow, and unit is
kg/h；B is NO in diesel engine vent gasXConcentration, unit ppm；C is the mass concentration of aqueous solution of urea, is 32.5%.
In the present invention, reaction of preferably first decomposing after the urea liquid enters in exhausting waste gas pipeline obtains ammonia
Gas, gained ammonia and the first gas are mixed to get second gas, in the present invention, in the ammonia and diesel engine vent gas
SCR catalysis occurs under the action of catalyst, in SCR reactor and reacts (i.e. redox reaction) for nitrogen oxides.
After obtaining second gas, the present invention is adjusted the temperature of the second gas using the air in air storage tank 7
For scheduled temperature, discharged after carrying out SCR catalysis reaction in SCR reactor 10 under the action of catalyst.In the present invention, institute
It states catalyst and preferably includes metal oxide, molecular sieve, natural crystal, V2O5-WO3/TiO2-SiO2/ cordierite, Cu/SAPO-
One or more of 34/ cordierite and Cu/SSZ-13/ cordierite more preferably include metal oxide, molecular sieve, natural mine
Stone, V2O5-WO3/TiO2-SiO2/ cordierite, Cu/SAPO-34/ cordierite or Cu/SSZ-13/ cordierite.In the present invention, institute
Stating scheduled temperature is preferably 200~500 DEG C, in the range by scheduled temperature setting, is convenient for the second gas of cracking adjustment
The temperature of body makes it meet the catalytic reaction temperature of SCR reactor.In the present invention, the temperature of the SCR catalysis reaction
Preferably 300~400 DEG C.In the present invention, when the temperature of second mixed gas is lower than the SCR catalytic reaction temperature
When, the air that temperature control equipment transfers out the air storage tank heats, to guarantee second mixed gas
Temperature reaches the temperature of SCR catalysis reaction, and SCR catalysis reaction is normally carried out；When the delivery temperature is higher than SCR catalysis instead
Temperature is answered, being heated or not heated for lower temperature is carried out to the air that the air storage tank transfers out.In the present invention, described
The temperature of the air stored in air storage tank is preferably 300~400 DEG C.
Illustrate to handle diesel engine vent gas using diesel engine exhaust gas treatment device provided by the invention below with reference to Fig. 1
Specific method, comprising the following steps: diesel engine vent gas is delivered in extraction flow measure and control device 1 progress flow inspection first
It surveys, and gained diesel engine vent gas data on flows is transmitted to data acquisition device 11, control core is to gained diesel engine vent gas stream
Amount data carry out calculating analysis, obtain NOXDiesel engine vent gas is passed through Dry desulfurization device 2 by the amount of discharge amount and required urea
Middle carry out desulfurization process, obtains first gas；The ammonia that the urea liquid sprayed in the first gas and urea box 3 decomposes
Gas is mixed, and second gas is obtained；Using SO2Concentration sensor 8 is to the SO in the second gas2Concentration is detected, and
By gained SO2Concentration data is transferred to data acquisition device 11,12 couples of gained SO of controller2Concentration data carries out analytical calculation, when
SO2When concentration is unsatisfactory for SCR catalyst requirement, the reagent in Dry desulfurization device 2 is replaced；Work as SO2Concentration meets SCR
It when catalyst requirement, is detected using temperature of the exhaust gas temperature sensor 9 to the second gas, and by gained second gas
Temperature data is transferred to data acquisition device 11, and 12 pairs of gained second gas temperature datas of controller carry out analytical calculation, regulation
The working condition of electrically-controlled valve 4 and control device 5, air-flow control device 6 is to the air stream transmitted out in air storage tank 7
Amount is detected, and gained air flow data is transferred in data acquisition device 11, when the second gas temperature is lower than predetermined
Temperature when, control core 12 control temperature control equipment 5 air exported in air storage tank 7 is heated, when described
When second gas temperature is higher than scheduled temperature, control core 12 controls temperature control equipment 5 and does not heat to air, controls
Core 12 controls the working condition of electrically-controlled valve 4, obtains by carrying out calculating analysis to air flow data, temperature data
To the second gas with scheduled temperature, by the second gas with scheduled temperature be passed through in SCR reactor 10 with
Catalyst carries out SCR catalysis reaction, is measured in real time using SCR temperature sensor 13 to SCR catalytic reaction temperature, and by institute
It obtains SCR catalytic reaction temperature data to be transferred in data acquisition device 11, control core 12 counts SCR catalytic reaction temperature
Point counting analysis, controls the working condition of temperature control equipment 5, finally, resulting gas meets diesel oil after the reaction was completed by SCR catalysis
Tail gas discharge standard can be directly discharged in atmospheric environment.
Below in conjunction with the embodiment in the present invention, the technical solution in the present invention is clearly and completely described.It is aobvious
So, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
Embodiment 1
SO in 4102 diesel engine tail gas2Concentration is 3000mg/m3, by extraction flow measure and control device 1, detect diesel oil
The flow of tail gas is 74964kg/h, density 1.63kg/m3, volume flow 46000m3/ h, NOXConcentration of emission be
587.3ppm, control core 12 calculate analyzing to exhaust emissions of diesel engine data obtains NOXDischarge amount 38kg/h, concentration
Dosage for the aqueous solution of urea of 32.5wt% is 111kg/h, and diesel engine vent gas is passed through in Dry desulfurization device 2 and iron oxide
It carries out obtaining second gas except sulphuring treatment；32.5wt% urea liquid in urea box 3 is ejected into useless with the flow of 111kg/h
It is decomposed after in gas discharge tube and obtains ammonia, the first gas is mixed with ammonia, obtains second gas；Using SO2It is dense
Sensor 8 is spent to SO in the second gas2Concentration is detected, by gained SO2Concentration data is transmitted to data acquisition device
11, controller 12 passes through the SO to obtained by2Concentration data carries out analytical calculation, works as SO2It is right when concentration is unsatisfactory for SCR catalyst requirement
Reagent in Dry desulfurization device 2 is replaced；Work as SO2When concentration meets SCR catalyst requirement, using exhaust gas temperature sensor
The temperature of 9 pairs of second gas detects, and the temperature data of gained second gas is transmitted to data acquisition device 11,
Controller 12 carries out analytical calculation as the temperature data of the second gas to obtained by, regulation regulation electrically-controlled valve 4 and control device 5
The flow of working condition, the air transferred out using air-flow control device 6 in air storage tank 7 is detected, by institute
It obtains air flow data to be transferred in data acquisition device 11, when the temperature of the second gas is required lower than SCR catalysis reaction
When, control core 12 heats mixed gas by control control temperature control equipment 5, when the temperature of the second gas
When requiring higher than SCR catalysis reaction, control core control temperature control equipment 5 is not heated air, and control core 12 is logical
It crosses and calculating analysis is carried out to the temperature and air themperature data of air flow data, the second gas, the work to electrically-controlled valve
State is controlled, and the second gas with predetermined temperature is obtained, and it is anti-that the second gas with predetermined temperature is passed through SCR
It answers in device 10 and is reacted with catalyst progress SCR catalysis, SCR catalytic reaction temperature is carried out using SCR temperature sensor 13 real-time
Detection, gained SCR catalytic reaction temperature is transferred into data acquisition device 11, control core 12 is urged as the SCR to obtained by
Change reaction temperature and carry out calculating analysis, control the working condition of temperature control equipment 5, SCR is catalyzed resulting after the reaction was completed
Gas meets exhaust emissions of diesel engine standard, can be directly discharged in atmospheric environment.
SO in diesel engine vent gas2Concentration is 3000mg/m3, NOXConcentration be 587.3ppm, through device provided by the invention
Carry out SO in the gas obtained after vent gas treatment2Concentration be 25mg/m3, NOXConcentration be reduced to 29ppm, denitration efficiency is higher than
95%, meet the job requirement of SCR reactor.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of diesel engine exhaust gas treatment device, which is characterized in that including data acquisition device (11), control core (12) and
The Dry desulfurization device (2) and SCR reactor (10) connected through exhaust emission pipe；
Urea box (3) is disposed between the Dry desulfurization device (2) and the SCR reactor (10), delivery temperature passes
Sensor (9) and temperature control equipment (5), wherein the outlet of the urea box (3) is connected with the exhaust emission pipe；It is described
Exhaust gas temperature sensor (9) is set in the exhaust emission pipe；It gives up with described the gas outlet of the temperature control equipment (5)
Gas discharge tube is connected, and the air inlet of the temperature control equipment (5) is connected with air storage tank (7)；
SCR temperature sensor (13) are provided in the SCR reactor (10)；
The data acquisition device (11) and the exhaust gas temperature sensor (9) and the SCR temperature sensor (13) communication link
It connects；
The control core (12) communicates to connect with the temperature control equipment (5) and the data acquisition device (11) respectively.
2. diesel engine exhaust gas treatment device according to claim 1, which is characterized in that temperature control equipment (5) packet
Airflow pipe, temperature control sleeve and electric heater are included, the temperature control sleeve is arranged on the outside of the airflow pipe, described
Electric heater is set between be set forth in airflow pipe and the temperature control sleeve, and the electric heater is fixed on the temperature control
On sleeve, the electric heater is connect with the airflow pipe.
3. diesel engine exhaust gas treatment device according to claim 1 or 2, which is characterized in that further include electrically-controlled valve (4), institute
It states in the pipeline that electrically-controlled valve (4) is set between temperature control equipment (5) and the exhaust emission pipe, the electrically-controlled valve (4)
It is communicated to connect with control core (12).
4. diesel engine exhaust gas treatment device according to claim 1 or 2, which is characterized in that further include air flow control
Device (6), the air-flow control device (6) are set to the pipeline between temperature control equipment (5) and air storage tank (7)
On, the air-flow control device (6) and the data acquisition device (11) communicate to connect.
5. diesel engine exhaust gas treatment device according to claim 1, which is characterized in that further include extraction flow measure and control device
(1), the extraction flow measure and control device (1) is connected through exhausting waste gas pipeline with the air inlet of Dry desulfurization device (2)；The row
Air-flow measurement and control device (1) and the data acquisition device (11) communicate to connect.
6. diesel engine exhaust gas treatment device according to claim 1, which is characterized in that further include SO2Concentration sensor (8),
The SO2Concentration sensor (8) is set in the exhausting waste gas pipeline between urea box (3) and exhaust gas temperature sensor (9), institute
State SO2Concentration sensor (8) and data acquisition device (11) communicate to connect.
7. using the method for any one of the claim 1~6 diesel engine exhaust gas treatment device processing diesel engine vent gas, feature
It is, comprising the following steps:
Diesel engine vent gas is passed through in Dry desulfurization device (2) and carries out desulfurization process, obtains first gas；
The first gas is mixed with the urea in urea box (3), obtains second gas；
The temperature of the second gas is adjusted to scheduled temperature using the air in air storage tank (7), is made in catalyst
It is discharged after carrying out SCR catalysis reaction in SCR reactor (10) under.
8. the method according to the description of claim 7 is characterized in that the reagent that the desulfurization process uses includes iron oxide or oxygen
Change calcium.
9. the method according to the description of claim 7 is characterized in that the catalyst includes metal oxide catalyst, molecule
Sieve catalyst, natural crystal catalyst, V2O5-WO3/TiO2-SiO2/ cordierite catalyst, Cu/SAPO-34/ cordierite catalyst
One or more of with Cu/SSZ-13/ cordierite catalyst.
10. method according to claim 7 or 8, which is characterized in that the temperature of the SCR catalysis reaction is 300~400
℃。
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| CN201910593646.8A CN110295986A (en) | 2019-07-03 | 2019-07-03 | A kind of diesel engine exhaust gas treatment device and method |
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| CN111589288A (en) * | 2020-07-10 | 2020-08-28 | 阳春新钢铁有限责任公司 | Desulfurization, denitrification and white removal device for ultralow emission of flue gas of sintering machine and process thereof |
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Application publication date: 20191001 |