CN103291419A - Tail gas purification device for internal combustion engine - Google Patents
Tail gas purification device for internal combustion engine Download PDFInfo
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- CN103291419A CN103291419A CN2012100501627A CN201210050162A CN103291419A CN 103291419 A CN103291419 A CN 103291419A CN 2012100501627 A CN2012100501627 A CN 2012100501627A CN 201210050162 A CN201210050162 A CN 201210050162A CN 103291419 A CN103291419 A CN 103291419A
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- tail gas
- urea
- gaseous ammonia
- filter cylinder
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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
- Y02T10/12—Improving ICE efficiencies
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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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Abstract
The invention discloses a tail gas purification device for an internal combustion engine, which comprises a gaseous ammonia generating system, a particle removing system and a catalytic reaction system which are connected in sequence, wherein the front end of the gaseous ammonia generating system is connected with a tail gas discharge outlet of the internal combustion engines, a urea solution is sprayed in extremely fine mist shape through an air flowing mode or a high-pressure spraying mode, and gaseous ammonia is generated under the action of the high-temperature tail gas; the front end of the particle removing system is connected with the gaseous ammonia generating system, the rear end is connected with the catalytic reaction system, and solid-state particles in the tail gas of the internal combustion engines are removed in a filtering mode; and a catalyst carrier is arranged in the catalytic reaction system and coated with a catalyst required by a reduction reaction. The tail gas purification device is simple in structure, small in size and light in weight; only one delicate airflow type spraying device or high-pressure spraying device is required for achieving a gaseous ammonia generating function, and the practicability is strong; the safety problem of the selective catalytic reduction method is solved fundamentally; and the defect that the gaseous ammonia generating amount by utilizing the selective catalytic reduction method is unstable is overcome.
Description
Technical field
The present invention relates to environmental technology field, particularly relate to a kind of tail gas purification device of combustion engine.
Background technique
For the pollution emission of internal-combustion engine, be that example is introduced with the diesel engine, include gaseous state and solid-state pollutant in the waste gas of diesel emission, be mainly NO in the gaseous contaminant
X, SO
2, CO, HC, oxide, organic nitrogen compound and sulfur-containing mixture etc.; Solid contaminant is the carbonized particle thing most importantly.In above-mentioned pollutant, NO most importantly
X, CO, SO
2, HC and solid particle (pm).In the prior art, the method that purifies above-mentioned gaseous contaminant mainly adopts selective catalytic reduction (Selective Catalytic Reduction is called for short SCR) to purify the NO in the gaseous contaminant
XAnd CO; When adopting this method, reactant is gaseous ammonia (NH3).For the method that obtains gaseous ammonia is to adopt ammoniacal liquor at normal temperatures (because having receptance between ammonia growing amount and the temperature, require the control temperature range very narrow, the high ammonia of temperature is excessive, cause ammonia pollution, temperature low reaction thing amount is few, purification efficiency is low) natural evaporation is ammonia, this cover gaseous ammonia generating apparatus comprises the ammonia vaporizer, the ammonia knock out drum, gas flow valve etc., these install relatively and diesel engine is sayed, seem that volume is too huge, ammonia is a kind of explosion hazard gases simultaneously, if ammonia concentration in air is in 5%～15% the scope, to meet naked light collapsing force and dangerous all very big blasts can take place, the exhaust emissions of diesel engine place is in the condition of high temperature, therefore, in diesel engine exhaust gas purification device, adopt the ammonia vaporizer, it is unpractical and dangerous that the ammonia knock out drum waits to obtain gaseous ammonia.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is how to realize safely and efficiently internal-combustion engine institute discharge tail gas in time being handled, and pollutes to avoid it to be discharged in the air.
(2) technological scheme
In order to solve the problems of the technologies described above, the invention provides a kind of tail gas purification device of combustion engine, comprise the gaseous ammonia generation system, particulate matter removal system and the catalytic reaction system that link to each other in turn; Described gaseous ammonia generation system front end links to each other with the internal combustion engine tail gas discharge mouth, the rear end links to each other with particulate matter removal system, the gaseous ammonia generation system becomes imperceptible vaporific in the mode of air-stream type or high-pressure fog with spraying urea liquid, produces gaseous ammonia under the effect of high-temperature tail gas; Described particulate matter is removed system front end and is linked to each other with the gaseous ammonia generation system, and the rear end links to each other with catalytic reaction system, removes particulate solid in the exhaust gases of internal combustion engines in the mode of filtration; Be provided with catalyst carrier in the described catalytic reaction system, apply the required catalyzer of reduction reaction on its inwall.
Wherein, comprise the preceding casing, middle casing and the rear box that connect and connect in turn, in the described preceding casing gaseous ammonia generation system is set, in the described middle casing particulate matter is set and removes system, in the described rear box catalytic reaction system is set.
Wherein, described gaseous ammonia generation system comprises the air-stream type shower nozzle that is arranged in the preceding casing, and the urea-water solution pipe and the pressurized air supply tube that link to each other respectively with the interface of air-stream type shower nozzle, described urea-water solution pipe links to each other with the urea-water solution storage tank that is contained with urea-water solution, and described pressurized air supply tube links to each other with the external compression air; Be respectively arranged with liquid inventory control valve and compressed air control valve on described urea-water solution pipe and the pressurized air supply tube.
Wherein, described gaseous ammonia generation system comprise be arranged on before pressure spray type spray nozzle in the casing, and the urea-water solution pipe, liquid inventory control valve, the high-pressure gear pump that link to each other respectively with the interface of pressing spray type spray nozzle and the urea-water solution storage tank that is contained with urea-water solution.
Wherein, bottom the casing before described middle casing front end connects, rear end connection rear box, bottom connection taper ash bucket, ash bucket the grey nut of lock is installed; Box back also is connected with the winding-up pipe in described, and described winding-up pipe links to each other with described external compression air.
Wherein, described winding-up pipe links to each other with the pressurized air supply tube by the pressurized air bypass duct; Be disposed with winding-up steam supply valve, compressed air reservoir and electromagnetic impulse valve on the described pressurized air bypass duct, described electromagnetic impulse valve links to each other with the winding-up controller by pilot, the air supply that the control of winding-up steam supply valve enters compressed air reservoir, the winding-up controller sends power on signal by pilot to electromagnetic impulse valve, and control electromagnetic pulse opening of valves is to pass through blowing gas in the winding-up Guan Xiangzhong casing.
Wherein, described middle box back is provided with the winding-up nozzle, and described winding-up nozzle links to each other with described winding-up pipe.
Wherein, be provided with the filter cylinder card in the described middle casing, described filter cylinder card central part is circular port, and outward edge shape and middle cabinets cavity shape of cross section are complementary; On the described filter cylinder card filter cylinder filter element is installed, described filter cylinder filter element comprise be installed in blind plate before the filter cylinder of casing front end, be installed in box back the filter cylinder ring flat-plate, with filter cylinder before blind plate and filter cylinder ring flat-plate form the stainless steel filter felt of column cavity and filter cylinder internal layer catch net and the filter cylinder outer layer protection net that is separately positioned on stainless steel filter felt inside and outside wall.
Wherein, described rear box middle part is provided with cross partition, and the rear box cross section is divided into four equidimension spaces, and a ceramic catalytic unit is set in each equidimension space.
Wherein, described ceramic catalytic unit is one vertically to offer a plurality of square ducts and the ceramic catalyst carrier of coated catalysts on the inwall of its square duct along it, wrap up in the shockproof felt of glass around each ceramic catalytic unit, prevent that the ceramic catalytic unit is impaired under shock conditions.
Wherein, described rear box rear end is equipped with backboard, and described backboard is provided with four and sizes corresponding with the ceramic catalytic cell position less than the hole of ceramic catalytic unit, to prevent ceramic catalytic unit play.
(3) beneficial effect
The tail gas purification device of combustion engine that technique scheme provides, apparatus structure is simple, volume is little, in light weight, only needs the exquisite air-stream type spraying system of a cover or press atomization system to realize the gaseous ammonia systematic function, and is practical; Fundamentally solved the safety issue of selective catalytic reduction; Solved the unsettled disadvantage of gaseous ammonia growing amount of selective catalytic reduction.
Description of drawings
Fig. 1 is the structural representation of the tail gas purification device of combustion engine of the embodiment of the invention 1;
Fig. 2 is the A-A sectional drawing among Fig. 1;
Fig. 3 is the B-B sectional drawing among Fig. 1;
Fig. 4 is the structural representation of the tail gas purification device of combustion engine of the embodiment of the invention 2.
Wherein, 1: lock grey nut; 2: ash bucket; 3: preceding raising middle flask fixing bolt group; 4: the stainless steel filter felt; 5: blind plate before the filter cylinder; 6: the air-stream type shower nozzle; 7: the diesel engine vent gas comb; 8: preceding casing; 9: urea--aqueous suction pipes; 10: the liquid inventory control valve; 11: urea--the aqueous solution; 12: urea--aqueous solution storage tank; 13: compressed air control valve; 14: the pressurized air supply tube; 15: the pressurized air bypass duct; 16: the winding-up steam supply valve; 17: compressed air reservoir; 18: the winding-up controller; 19: electromagnetic impulse valve; 20: pilot; 21: middle casing; 22: the winding-up pipe; 23: filter cylinder outer layer protection net; 24: filter cylinder internal layer catch net; 25: the winding-up nozzle; 26: rear box; 27: the shockproof felt of glass; 28: the ceramic catalytic unit; 29: the cross dividing plate; 30: backboard; 31: whole floss hole; 32: the filter cylinder card; 33: filter cylinder fixing bolt group; 34: middle rear cabinet fixing bolt group; 35: the filter cylinder ring flat-plate; 36: high-pressure gear pump; 37: press spray type spray nozzle.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
The invention provides a kind of device for the diesel engine vent gas purification, this device adopts urea (CON
2H
4)-the aqueous solution enters exhaust gas cleaner inside by pipeline, urea-water solution is become little drop state and fully mix with high-temperature tail gas by air-stream spraying (embodiment 1) or high-pressure fog (embodiment 2), urea under the effect of high-temperature tail gas in the urea-water solution is heated to rapidly more than 160 ℃ and decomposes, and produces ammonia (NH
3) and biuret (CONH), wherein ammonia (NH
3) in a part as removing SO
2Reactant, another part is as the reactant of selective catalytic reduction, not only the ammonia gas generating device volume is little for this method, and is safe, and the control by liquid towards urea input quantity can realize the accurate control to the ammonia generating capacity.
As shown in Figure 1: being used for discharge capacity is 9 liters; maximum speed is the diesel engine exhaust gas purification device of the high-speed diesel engine of 2500r/min; its basic boundary dimension is: length * wide * height=1300mm * 400mm * 400mm; the structure of this device as shown in Figure 1; Fig. 2 is the A-A sectional drawing of Fig. 1; Fig. 3 is the B-B sectional view of Fig. 1, and it comprises the grey nut 1 of lock; ash bucket 2; preceding raising middle flask fixing bolt group 3; stainless steel filter felt 4; blind plate 5 before the filter cylinder; air-stream type shower nozzle 6; diesel engine vent gas comb 7; preceding casing 8; urea-water solution pipe 9; liquid inventory control valve 10; urea-water solution 11; urea-water solution storage tank 12; compressed air control valve 13; pressurized air supply tube 14; pressurized air bypass duct 15; winding-up steam supply valve 16; compressed air reservoir 17; winding-up controller 18; electromagnetic impulse valve 19; pilot 20; middle casing 21; winding-up pipe 22; filter cylinder outer layer protection net 23; filter cylinder internal layer catch net 24; winding-up nozzle 25; rear box 26; the shockproof felt 27 of glass; ceramic catalytic unit 28; cross dividing plate 29; backboard 30; whole floss hole 31; filter cylinder card 32; filter cylinder fixing bolt group 33; middle rear cabinet fixing bolt group 34; filter cylinder ring flat-plate 35.
In the present embodiment, by air-stream type shower nozzle 6, preceding casing 8, urea-water solution pipe 9, liquid inventory control valve 10, urea-water solution storage tank 12, pressurized air supply tube 14, compressed air control valve 13 is formed the gaseous ammonia generation system, the preceding casing 8 steel plate sheet metal box body processed of putting for level wherein, its front portion is cylindric, intermediate portion is the excessive casing in circle side, its rear portion is square box, its front end is connected with diesel engine vent gas comb 7, its rear end is connected with middle casing 21 by preceding raising middle flask fixing bolt group 3, its front portion is inserted urea-water solution pipe 9 and pressurized air supply tube 14 respectively for cylindric casing top, and these two pipelines insert the corresponding interface of the air-stream type shower nozzle 6 that is positioned at cylindric casing center; Liquid inventory control valve 10 is set in the middle of another termination urea-water solution storage tank 12 bottoms of urea-water solution pipe 9, urea-water solution pipe, and urea-water solution storage tank 12 is a perpendicular tank body of putting, and compressed air control valve 13 is set in the middle of the pressurized air supply tube 14;
Form particulate matter and remove system by blind plate 5, pressurized air bypass duct 15, winding-up steam supply valve 16, compressed air reservoir 17, winding-up controller 18, electromagnetic impulse valve 19, pilot 20, middle casing 21, winding-up pipe 22, filter cylinder outer layer protection net 23, filter cylinder internal layer catch net 24, winding-up nozzle 25, filter cylinder card 32, filter cylinder fixing bolt group 33, filter cylinder ring flat-plate 35 before the grey nut 1 of lock, ash bucket 2, stainless steel filter felt 4, the filter cylinder.In casing 21 be vacant square plate sheet metal box body processed in rear and front end and lower end that a level is put, its underrun welding is connected with the steel plate ash bucket 2 processed of old name for the Arabian countries in the Middle East's ground circle, locks grey nut 1 on the screw thread outside the bottom cylinder of round steel plate ash bucket processed with being screwed in old name for the Arabian countries in the Middle East; Middle casing 21 front ends are connected with preceding casing 8 by preceding raising middle flask fixing bolt group 3, and its rear end is connected with rear box 26 by middle rear box fixing bolt group 34; The chamber arranges the filter cylinder card 32 of a square-outside and round-inside steel plate system within it, and the foreign side of this filter cylinder card 32 is welded on the middle inclined to one side rear of casing 21 inner chambers; Form the filter cylinder filter element that filter material is stainless steel filter felt 4 by the 5 filter cylinder ring flat-plates 35 of blind plate before the filter cylinder, filter cylinder outer layer protection net 23, filter cylinder internal layer catch net 24, stainless steel filter felt 4; wherein blind plate 5 is a steel plate rounding blind plate before the filter cylinder; filter cylinder ring flat-plate 35 is a steel doughnut-shaped steel plate; circle is the air-out passage for the outside filtering type filter cylinder in it; stainless steel filter felt 4 is one to be folded into Accordion qin case shape and to surround the filtering material of tubular; its skin is with filter cylinder outer layer protection net 23, and its internal layer has netted filter cylinder internal layer catch net 24.This filter cylinder filter element is connected on the filter cylinder card 32 by filter cylinder fixing bolt group 33.Pick out a pressurized air bypass duct 15 from pressurized air supply tube 14, one winding-up steam supply valve 16 is set to compressed air reservoir 17 supply pressurized air at this pipe, when the particulate matter amount that accumulates on the filtering material of outside filtering type filter cylinder surpasses a threshold value, winding-up controller 18 sends a signal to electromagnetic impulse valve 19 energisings by pilot 20, electromagnetic impulse valve 19 moments unlatching, pressurized air in the compressed air reservoir arrives winding-up nozzle 25 to outside filtering type filter cylinder inner chamber winding-up (opposite with the tail gas filtering direction) by winding-up pipe 22, realize that cleaning is attached to the dust stratification on the filter layer, fallen into ash bucket 2 by the dust stratification after the cleaning, after treating long-pending expiring, turn on the grey nut 1 of lock and discharge.
Form catalytic reaction system by rear box 26, the shockproof felt 27 of glass, ceramic catalytic unit 28, cross dividing plate 29, backboard 30, whole floss hole 31, rear box 26 is that the circle box body combinations forms behind a square box and a place ahead, its front end is connected with middle casing by middle rear box fixing bolt group 34, and rear end and whole floss hole 31 are welded to connect.At rear box 26 middle parts one cross dividing plate 29 is set, rear box 26 square-sections are divided into four equidimension square spaces, in each square space, put a ceramic catalytic unit 28, ceramic catalytic unit 28 is one vertically to offer many square ducts along it (sectional dimension is the catalyst carrier of 4.3mm * 4.3mm), the ceramic products of coated catalysts on the inwall of its square duct, it is attached to adopt the shockproof felt 27 of glass to wrap up in around each ceramic catalytic unit 28, in order to avoid ceramic catalytic unit 28 is impaired under shock conditions.Backboard 30 is a square plate, and inner uniform four square holes that are slightly less than the ceramic catalytic unit play the ceramic catalytic unit effect of play forward that prevents.
Present embodiment and embodiment's 1 difference part is, the gaseous ammonia generation system of being made up of air-stream type shower nozzle 6, preceding casing 8, confession urea-water solution pipe 9, liquid inventory control valve 10, urea-water solution storage tank 12, pressurized air supply tube 14, compressed air control valve 13 among the embodiment 1 is replaced by the gaseous ammonia generation system of being made up of high-pressure gear pump 36, preceding casing 8, pressure spray type spray nozzle 37, liquid inventory control valve 10, confession urea-water solution pipe 9 and urea-water solution storage tank 12; Spray pattern is replaced by press spray by the air-stream type spraying; The preceding casing 8 steel plate sheet metal box body processed of putting for level wherein, its front portion is cylindric, intermediate portion is the excessive casing in circle side, its rear portion is square box, its front end is connected with diesel engine vent gas comb 7, its rear end is connected with middle casing 21 by preceding raising middle flask fixing bolt group 3, and its anterior insertion respectively for cylindric casing top supplies urea-water solution pipe 9, and pipeline inserts the corresponding interface of the pressure spray type spray nozzle 37 that is positioned at cylindric casing center; For another termination liquid inventory control valve 10 and high-pressure gear pump 36 of urea-water solution pipe 9, urea-water solution storage tank 12 is a perpendicular tank body of putting.
The working principle of above-described embodiment 1 and embodiment's 2 the device gas that is used for purifying internal combustion engine tail gas is identical, as follows:
When proper functioning, among the embodiment 1 in the urea-water solution storage tank 12 urea-water solution 11 under the gravity effect through entering air-stream type shower nozzle 6 for urea-water solution pipe 9, liquid inventory control valve 10; Pressurized air by pressurized air supply tube 14, compressed air control valve 13 also enters air-stream type shower nozzle 6 simultaneously, in air-stream type shower nozzle 6, pressurized air fully mixes with urea-water solution 11, because of velocity of compressed air high, so under the effect of the speed difference of pressurized air and urea-water solution 11, the liquid film of urea-water solution 11 is torn, and forms atomic thin urea-water solution 11 drops and is ejected air-stream type shower nozzle 6, forms the fog-zone that atomic thin urea-water solution 11 drops of a slice form.
When proper functioning, among the embodiment 2 in the urea-water solution storage tank 12 urea-water solution 11 under the pumping action of high-pressure gear pump 36 through for urea-water solution pipe 9, liquid inventory control valve 10 to pressing spray type spray nozzle 37 that high pressure urea-aqueous solution liquid stream is provided, press down the fog-zone that atomic thin urea-water solution 11 drops of spray type spray nozzle 37 ejections form in the high pressure effect.
Casing 8 anterior cylindric casings before diesel engine vent gas enters by diesel engine vent gas comb 7, after running into the fog-zone of the atomic thin urea-water solution 11 drops formation of this sheet, mix rapidly, because diesel engine vent gas is high-temperature gas (350 ℃--about 430 ℃), so atomic thin urea-water solution 11 drops are heated rapidly, moisture wherein evaporates rapidly, urea (CON wherein
2H
4) (the CON of (more than 160 ℃) generation decomposition reaction at high temperature
2H
4)=(NH
3)+(CONH) produces ammonia (NH
3) and biuret (CONH), ammonia wherein mixes with gas in the tail gas, mix a part of ammonia in back immediately with tail gas in sulfur dioxide following chemical reaction takes place, its reaction equation is:
SO
2+H
2O+xNH
3＝(HN
4)xH
2-xSO
3 (1)
Obtain the ammonium base bisulfite semifinished product, ammonium base bisulfite carries out oxidation again:
(NH
4)XH
2-XSO
3+1/2O
2+(2-x)NH
3＝(NH
4)2SO
4 2
Realized complete dry desulfurization, the end-product ammonium sulfate (NH after the desulfurization
4)
2SO
4Decomposing back biuret (CONH) with urea can sneak in the tail gas by the tiny solid granulates of formation.
In the major component that comprises of casing 21 be that to be actually one be the fold cartridge of filtering material with stainless steel filter felt 4 in particulate matter removal system, the mixed gas of residue ammonia etc. at first runs into blind plate 5 before the filter cylinder during casing 8 enters in the past after tail gas and the desulfurization behind casing 21 front ends, it is a steel plate rounding blind plate, mixed gas can't pass, can only detour by collapsible stainless steel filter felt 4 skins, pass collapsible stainless steel filter felt 4 then and enter the filter cylinder inner chamber, realize filtering.By filtering, the particulate matter in the tail gas (is comprised the ammonium sulfate (NH after particulate matter such as original carbonized particle thing in the tail gas and urea decompose back biuret (CONH) and desulfurization
4)
2SO
4Tiny solid granulates) removes.After stainless steel filter felt 4 has accumulated a certain amount of particulate matter, the filter layer resistance is strengthened, influencing mixed gas passes through, this moment is by starting winding-up controller 18, send a signal to electromagnetic impulse valve 19 energisings through pilot 20, electromagnetic impulse valve 19 moments unlatching, pressurized air in the compressed air reservoir 17 is by winding-up pipe 22,22 to winding-up nozzle 25, by winding-up nozzle 25 to outside filtering type filter cylinder inner chamber winding-up (opposite with the tail gas filtering direction), realize that cleaning is attached to the particulate matter of the accumulation on stainless steel filter felt 4 skins, fallen into ash bucket 2 by the particulate matter after the cleaning, treat the long-pending full particulate matters of ash bucket 2 after, turn on the grey nut 1 of lock and discharge.The passage of the mixed gas of removing residue ammonia after tail gas behind the particulate matter and the desulfurization after filtering by filter cylinder card 32 and filter cylinder ring flat-plate 35 hollows enters the catalytic reaction system in the rear box 26, when mixed gas passes on a plurality of inwalls of ceramic catalytic unit 28 the coated catalysts square duct, under high temperature and catalytic condition, the gaseous ammonia in the tail gas mixed gas and nitrogen oxide (comprise NO and NO
2) following chemical reaction takes place:
4NH
3+4NO+O
2＝4N
2+6H
2O
8NH
3+6NO
2＝7N
2+12H
2 O 2
Under high temperature and catalytic condition, the carbon monoxide in the tail gas mixed gas and nitrogen oxide (comprise NO and NO simultaneously
2) following chemical reaction takes place:
2CO+2NO+O
2＝2CO
2+N
2
4CO+2NO
2＝4CO
2+N
22
By above-mentioned chemical reaction, with nitrogen, carbon dioxide and the water of the carbon monoxide in the diesel engine vent gas and nitrogen oxide generation environmental sound.To sum up, by above three grades of purifications, with the main gaseous contaminant (NO of diesel emission
X, SO
2, CO) and solid granulates pollutant.Realize overwhelming majority removal.Therefore, above structure and process are brought following beneficial effect:
(1) apparatus structure is simple, volume is little, in light weight, only need the exquisite air-stream type spraying system of a cover to realize the gaseous ammonia systematic function, replace the gaseous ammonia generation system that huge equipment such as ammonia vaporizer, ammonia knock out drum, gas flow valve is formed in the selective catalytic reduction, this says more possess practicability for major part for the mobile pollution source diesel engine.
(2) fundamentally solved the safety issue of selective catalytic reduction
Because selective catalytic reduction is to produce gaseous ammonia by the evaporation of ammoniacal liquor in the ammonia vaporizer at last gaseous ammonia is being sneaked in the tail gas through the ammonia knock out drum again, in this process, the concentration of the gaseous ammonia that produces is easy to reach concentration between the blast critical zone, exists very high potential safety hazard; And the method that gaseous ammonia produces among the present invention is that urea-water solution is directly sneaked among the high-temperature tail gas, decomposition by urea produces gaseous ammonia, the concentration that this method generates gaseous ammonia can depart from far away between the concentration blast area of ammonia, thereby has eliminated the selective catalytic reduction potential safety hazard fully.
(3) solved the unsettled disadvantage of gaseous ammonia growing amount of selective catalytic reduction
Because selective catalytic reduction is to think highly of the generation gaseous ammonia in the ammonia evaporation, its production is very responsive to temperature, must accurately control the temperature of ammonia vaporizer, can control generating capacity, simultaneously also will be by ammonia knock out drum buffering, use the gas control valve adjustment again, finally could realize injecting tail gas with suitable ammonia amount.And the present invention is because generating the method difference of gaseous ammonia, the injection amount of its gaseous ammonia in tail gas depends on concentration and the injection amount of urea-water solution fully, and concentration is very easily controlled when configuration, mixed volume needs only and just can accurately control by a liquid control valve (more much smaller than gas control valve), and can not change because of the variation of temperature conditions.Thereby realized the purpose of accurate control injection tail gas gaseous ammonia.Can not cause because injecting the excessive pollution that causes ammonia of gaseous ammonia, can be because not injecting the very few NO that purifies gaseous contaminant that causes of gaseous ammonia yet
XWith the inefficient problem of CO.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and replacement, these improvement and replacement also should be considered as protection scope of the present invention.
Claims (11)
1. a tail gas purification device of combustion engine is characterized in that, comprises the gaseous ammonia generation system, particulate matter removal system and the catalytic reaction system that link to each other in turn; Described gaseous ammonia generation system front end links to each other with the internal combustion engine tail gas discharge mouth, the rear end links to each other with particulate matter removal system, the gaseous ammonia generation system becomes imperceptible vaporific in the mode of air-stream type or high-pressure fog with spraying urea liquid, produces gaseous ammonia under the effect of high-temperature tail gas; Described particulate matter is removed system front end and is linked to each other with the gaseous ammonia generation system, and the rear end links to each other with catalytic reaction system, removes particulate solid in the exhaust gases of internal combustion engines in the mode of filtration; Be provided with catalyst carrier in the described catalytic reaction system, apply the required catalyzer of reduction reaction on its inwall.
2. tail gas purification device of combustion engine as claimed in claim 1, it is characterized in that, comprise the preceding casing, middle casing and the rear box that connect and connect in turn, in the casing gaseous ammonia generation system is set before described, particulate matter is set in the casing in described removes system, in the described rear box catalytic reaction system is set.
3. tail gas purification device of combustion engine as claimed in claim 2, it is characterized in that, described gaseous ammonia generation system comprises the air-stream type shower nozzle that is arranged in the preceding casing, and the urea-water solution pipe and the pressurized air supply tube that link to each other respectively with the interface of air-stream type shower nozzle, described urea-water solution pipe links to each other with the urea-water solution storage tank that is contained with urea-water solution, and described pressurized air supply tube links to each other with the external compression air; Be respectively arranged with liquid inventory control valve and compressed air control valve on described urea-water solution pipe and the pressurized air supply tube.
4. tail gas purification device of combustion engine as claimed in claim 2, it is characterized in that, described gaseous ammonia generation system comprise be arranged on before pressure spray type spray nozzle in the casing, and the urea-water solution pipe, liquid inventory control valve, the high-pressure gear pump that link to each other respectively with the interface of pressing spray type spray nozzle and the urea-water solution storage tank that is contained with urea-water solution.
5. tail gas purification device of combustion engine as claimed in claim 2 is characterized in that, described in the casing front end connect before casing, the rear end connects rear box, the bottom connects the taper ash bucket, the grey nut of lock is installed in the ash bucket bottom; Box back also is connected with the winding-up pipe in described, and described winding-up pipe links to each other with described external compression air.
6. tail gas purification device of combustion engine as claimed in claim 5 is characterized in that, described winding-up pipe links to each other with the pressurized air supply tube by the pressurized air bypass duct; Be disposed with winding-up steam supply valve, compressed air reservoir and electromagnetic impulse valve on the described pressurized air bypass duct, described electromagnetic impulse valve links to each other with the winding-up controller by pilot, the air supply that the control of winding-up steam supply valve enters compressed air reservoir, the winding-up controller sends power on signal by pilot to electromagnetic impulse valve, and control electromagnetic pulse opening of valves is to pass through blowing gas in the winding-up Guan Xiangzhong casing.
7. tail gas purification device of combustion engine as claimed in claim 6 is characterized in that, described middle box back is provided with the winding-up nozzle, and described winding-up nozzle links to each other with described winding-up pipe.
8. tail gas purification device of combustion engine as claimed in claim 2 is characterized in that, is provided with the filter cylinder card in the described middle casing, and described filter cylinder card central part is circular port, and outward edge shape and middle cabinets cavity shape of cross section are complementary; On the described filter cylinder card filter cylinder filter element is installed, described filter cylinder filter element comprise be installed in blind plate before the filter cylinder of casing front end, be installed in box back the filter cylinder ring flat-plate, with filter cylinder before blind plate and filter cylinder ring flat-plate form the stainless steel filter felt of column cavity and filter cylinder internal layer catch net and the filter cylinder outer layer protection net that is separately positioned on stainless steel filter felt inside and outside wall.
9. tail gas purification device of combustion engine as claimed in claim 2 is characterized in that, described rear box middle part is provided with cross partition, and the rear box cross section is divided into four equidimension spaces, and a ceramic catalytic unit is set in each equidimension space.
10. tail gas purification device of combustion engine as claimed in claim 9, it is characterized in that, described ceramic catalytic unit is one vertically to offer a plurality of square ducts and the ceramic catalyst carrier of coated catalysts on the inwall of its square duct along it, wrap up in the shockproof felt of glass around each ceramic catalytic unit, prevent that the ceramic catalytic unit is impaired under shock conditions.
11. tail gas purification device of combustion engine as claimed in claim 9, it is characterized in that, described rear box rear end is equipped with backboard, and described backboard is provided with four and sizes corresponding with the ceramic catalytic cell position less than the hole of ceramic catalytic unit, to prevent ceramic catalytic unit play.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210050162.7A CN103291419B (en) | 2012-02-29 | 2012-02-29 | A kind of tail gas purification device of combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210050162.7A CN103291419B (en) | 2012-02-29 | 2012-02-29 | A kind of tail gas purification device of combustion engine |
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| CN103291419B CN103291419B (en) | 2015-12-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104771969A (en) * | 2015-04-20 | 2015-07-15 | 北京京能未来燃气热电有限公司 | Refined filtration drum dedusting device and refined filtration drum dedusting method for inlet air filtering system of gas turbine |
| CN105240093A (en) * | 2015-09-30 | 2016-01-13 | 暴辰生 | Diesel engine tail gas cleaning device |
| CN107427750A (en) * | 2015-04-03 | 2017-12-01 | 雅玛信过滤器株式会社 | Coarse filter |
| CN109154225A (en) * | 2016-05-12 | 2019-01-04 | 罗伯特·博世有限公司 | For improving the device and method of the resorption of reducing agent in exhaust gas also original system |
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| FR2819549A1 (en) * | 2001-01-12 | 2002-07-19 | Renault | I.C. engine exhaust gas treatment system has particle filter in main exhaust pipe downstream of sulfur oxide trap |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107427750A (en) * | 2015-04-03 | 2017-12-01 | 雅玛信过滤器株式会社 | Coarse filter |
| CN107427750B (en) * | 2015-04-03 | 2020-02-21 | 雅玛信过滤器株式会社 | Coarse filter |
| CN104771969A (en) * | 2015-04-20 | 2015-07-15 | 北京京能未来燃气热电有限公司 | Refined filtration drum dedusting device and refined filtration drum dedusting method for inlet air filtering system of gas turbine |
| CN105240093A (en) * | 2015-09-30 | 2016-01-13 | 暴辰生 | Diesel engine tail gas cleaning device |
| CN105240093B (en) * | 2015-09-30 | 2017-12-22 | 暴辰生 | A kind of diesel engine exhaust gas purification device |
| CN109154225A (en) * | 2016-05-12 | 2019-01-04 | 罗伯特·博世有限公司 | For improving the device and method of the resorption of reducing agent in exhaust gas also original system |
| CN109154225B (en) * | 2016-05-12 | 2021-07-06 | 罗伯特·博世有限公司 | Apparatus and method for improving the reabsorbability of a reducing agent in an exhaust gas reduction system |
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| CN103291419B (en) | 2015-12-16 |
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