CN202493322U - Tail gas purification device of internal combustion engine - Google Patents
Tail gas purification device of internal combustion engine Download PDFInfo
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- CN202493322U CN202493322U CN201220070957XU CN201220070957U CN202493322U CN 202493322 U CN202493322 U CN 202493322U CN 201220070957X U CN201220070957X U CN 201220070957XU CN 201220070957 U CN201220070957 U CN 201220070957U CN 202493322 U CN202493322 U CN 202493322U
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- combustion engine
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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 utility model discloses a tail gas purification device of an internal combustion engine. The tail gas purification device of the internal combustion engine comprises a gaseous ammonia generating system, a particulate eliminating system and a catalytic reaction system which are connected in sequence. The front end of the gaseous ammonia generating system is connected with a tail gas discharge outlet of the internal combustion engine, urea solution is sprayed into extremely slight haze in an air-flowing mode or a hyperbaric spraying mode, and the gaseous ammonia is generated under an effect of high-temperature tail gas. The front end of the particulate eliminating system is connected with the gaseous ammonia generating system, the back end of the particulate eliminating system is connected with the catalytic reaction system, and therefore solid particulates in the tail gas of the internal combustion engine are eliminated through filtration. A catalyst carrier is arranged in the catalytic reaction system and the catalyst required in a reduction reaction is covered on the catalytic reaction system. The tail gas purification device of the internal combustion engine has the advantages of simple structure, small size, light weight and strong practicability due to the fact that only one set of ingenious air-flowing spraying device or high-pressure spraying device is required to generate the gaseous ammonia. The tail gas purification device of the internal combustion engine solves the problems of safety problem of selective catalytic reduction and instability of gaseous ammonia production in the selective catalytic reduction.
Description
Technical field
The utility model relates to environmental technology field, particularly relates 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 that (because of having receptance between ammonia growing amount and the temperature, require the control temperature range very narrow, the high ammonia of temperature is excessive at normal temperatures for employing ammoniacal liquor; Cause ammonia pollution, temperature low reaction thing amount is few, and purification efficiency is low) natural evaporation is ammonia; This cover gaseous ammonia generating apparatus comprises ammonia vaporizer, ammonia knock out drum, gas flow valve etc., and these install relatively and diesel engine says that the volume that seems 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 blast can take place, the exhaust emissions of diesel engine place is in the condition of high temperature; Therefore, it is unpractical and dangerous in diesel engine exhaust gas purification device, adopt ammonia vaporizer, ammonia knock out drum to wait obtaining gaseous ammonia.
The model utility content
The technical problem that (one) will solve
The technical problem that the utility model will solve 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 utility model provides a kind of tail gas purification device of combustion engine, comprises the gaseous ammonia generation system, particulate matter removal system and the catalytic reaction system that link to each other in order; Said 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 with the mode of air-stream type or high-pressure fog with spraying urea liquid, under the effect of high-temperature tail gas, produces gaseous ammonia; Said 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 the particulate solid in the exhaust gases of internal combustion engines with the mode of filtering; Be provided with catalyst carrier in the said 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 order, in the said preceding casing gaseous ammonia generation system is set, in the said middle casing particulate matter is set and removes system, in the said rear box catalytic reaction system is set.
Wherein, Said 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; Said urea-water solution pipe links to each other with the urea-water solution storage tank that is contained with urea-water solution, and said 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 said urea-water solution pipe and the pressurized air supply tube.
Wherein, Said 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 said 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 said, and said winding-up pipe links to each other with said external compression air.
Wherein, said winding-up pipe links to each other with the pressurized air supply tube through the pressurized air bypass duct; Be disposed with winding-up steam supply valve, compressed air reservoir and electromagnetic impulse valve on the said pressurized air bypass duct; Said electromagnetic impulse valve links to each other with the winding-up controller through pilot; The air supply that the control of winding-up steam supply valve gets into compressed air reservoir; The winding-up controller sends power on signal through 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, said middle box back is provided with the winding-up nozzle, and said winding-up nozzle links to each other with said winding-up pipe.
Wherein, be provided with the filter cylinder card in the said middle casing, said filter cylinder card central part is a circular port, and outward edge shape and middle cabinets cavity shape of cross section are complementary; On the said filter cylinder card filter cylinder filter element is installed, said 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, said 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, Said 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, said rear box rear end is equipped with backboard, and said backboard is provided with the hole of four and sizes corresponding with the ceramic catalytic cell position less than the ceramic catalytic unit, to prevent ceramic catalytic unit play.
(3) beneficial effect
The tail gas purification device of combustion engine that technique scheme provided, apparatus structure is simple, volume is little, in light weight, only needs 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 utility model embodiment 1 tail gas purification device of combustion engine;
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 utility model embodiment 2 tail gas purification device of combustion engine.
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 accompanying drawing and embodiment, the embodiment of the utility model is described in further detail.Following examples are used to explain the utility model, but are not used for limiting the scope of the utility model.
The utility model provides a kind of device that diesel engine vent gas purifies that is used for, and this device adopts urea (CON
2H
4It is inner that the)-aqueous solution gets into exhaust gas cleaner through pipeline; Urea-water solution is become little drop state and fully mix through air-stream spraying (embodiment 1) or high-pressure fog (embodiment 2) with high-temperature tail gas; 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 can realize the accurate control to the ammonia generating capacity through the control of liquid towards urea input quantity.
As shown in Figure 1: being used for discharge capacity and being 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 is 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 shockproof felt of blind plate 5 before the grey nut of lock 1, ash bucket 2, preceding raising middle flask fixing bolt group 3, stainless steel filter felt 4, 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, glass 27, 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; Form the gaseous ammonia generation system 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; The steel plate system sheet metal box body that wherein preceding casing 8 is put for level; Its front portion is cylindric, and intermediate portion is the excessive casing in circle side, and its rear portion is a square box; Its front end is connected with diesel engine vent gas comb 7; Its rear end is connected with middle casing 21 through preceding raising middle flask fixing bolt group 3, and it is anterior for inserting urea-water solution pipe 9 and pressurized air supply tube 14 respectively in cylindric casing top, and these two pipelines accesses are positioned at the corresponding interface of the air-stream type shower nozzle 6 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;
Forms particulate matter removal 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 of lock 1, ash bucket 2, stainless steel filter felt 4, the filter cylinder.In casing 21 be the vacant square plate system sheet metal box body in rear and front end and lower end that a level is put, its underrun welding is connected with the steel plate system ash bucket 2 of old name for the Arabian countries in the Middle East's ground circle, locks on the screw thread outside the bottom cylinder of the round steel plate system ash bucket of grey nut 1 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 through preceding raising middle flask fixing bolt group 3, and its rear end is connected with rear box 26 through middle rear box fixing bolt group 34; The chamber is provided with 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 a 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 that supplies 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, and 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 through 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 supplied with compressed air on this pipe, when the particulate matter amount that accumulates on the filtering material of outside filtering type filter cylinder surpassed a threshold value, winding-up controller 18 sent a signal to electromagnetic impulse valve 19 energisings through 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 (in the opposite direction with tail gas filtering) through winding-up pipe 22, realizes cleaning attached to the dust stratification on the filter layer, and the dust stratification after quilt is cleared up falls into ash bucket 2; After treating long-pending expiring, turn on the grey nut 1 of lock and discharge.
Form catalytic reaction system by the shockproof felt of rear box 26, glass 27, 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 through 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 adopts the shockproof felt 27 of glass to wrap up in around each ceramic catalytic unit 28 and attaches, in order to avoid ceramic catalytic unit 28 is impaired under shock conditions.Backboard 30 is a square plate, and inside is uniformly distributed with four square holes that are slightly less than the ceramic catalytic unit, plays 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, 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 steel plate system sheet metal box body that wherein preceding casing 8 is put for level; Its front portion is cylindric, and intermediate portion is the excessive casing in circle side, and its rear portion is a square box; Its front end is connected with diesel engine vent gas comb 7; Its rear end is connected with middle casing 21 through preceding raising middle flask fixing bolt group 3, and its front portion is inserted urea-water solution pipe 9 respectively for cylindric casing top, and pipeline inserts the corresponding interface of the pressure spray type spray nozzle 37 that is positioned at cylindric casing center; 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 are a perpendicular tank body of putting.
The working principle of the foregoing description 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, 12 urea-water solution 11 warp confession urea-water solution pipe 9, liquid inventory control valve 10 entering air-stream type shower nozzles 6 under action of gravity in the urea-water solution storage tank among the embodiment 1; Pressurized air through pressurized air supply tube 14, compressed air control valve 13 also gets into 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 urea-water solution pipe 9, liquid inventory control valve 10 to pressing spray type spray nozzle 37 that high pressure urea-aqueous solution flow 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 gets into through 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 of 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
42
Realized complete dry desulfurization, the end-product ammonium sulfate (NH after the desulfurization
4)
2SO
4Can form tiny solid granulates with biuret after the urea decomposition (CONH) sneaks in the tail gas.
In the major component that comprised 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 gets in the past after tail gas and the desulfurization behind casing 21 front ends; It is a steel plate rounding blind plate, and mixed gas can't pass, and can only detour through collapsible stainless steel filter felt 4 skins; Pass collapsible stainless steel filter felt 4 then and get into the filter cylinder inner chamber, realize filtering.Through filtering, the particulate matter in the tail gas (is comprised the ammonium sulfate (NH behind the biuret (CONH) and desulfurization after particulate matter such as original carbonized particle thing in the tail gas and the urea decomposition
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, influence mixed gas and pass through; Through starting winding-up controller 18, send a signal to electromagnetic impulse valve 19 energisings through pilot 20, electromagnetic impulse valve 19 moments unlatching at this moment; Pressurized air in the compressed air reservoir 17 arrives winding-up nozzle 25 through winding-up pipe 22,22; To outside filtering type filter cylinder inner chamber winding-up (in the opposite direction), realize the particulate matter of cleaning by winding-up nozzle 25, fallen into ash bucket 2 by the particulate matter after clearing up attached to the accumulation on stainless steel filter felt 4 skins with tail gas filtering; After treating ash bucket 2 long-pending full particulate matters, turn on the grey nut 1 of lock and discharge.The mixed gas of removing residue ammonia after tail gas and the desulfurization behind the particulate matter after filtering gets into the catalytic reaction system in the rear box 26 through the passage of filter cylinder card 32 and filter cylinder ring flat-plate 35 hollows; 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, 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
2O2
Under high temperature and catalytic condition, 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
Through above-mentioned chemical reaction, with nitrogen, carbon dioxide and the water of carbon monoxide in the diesel engine vent gas and nitrogen oxide generation environmental sound.To sum up, through 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 of selective catalytic reduction is to produce gaseous ammonia through 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 in the utility model is that urea-water solution is directly sneaked among the high-temperature tail gas; Decomposition through 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; Accurately the temperature of control ammonia vaporizer can be controlled generating capacity, simultaneously also will be through ammonia knock out drum buffering; With the gas control valve adjustment, finally could realize injecting tail gas again with suitable ammonia amount.And the utility model is different because of the method that generates gaseous ammonia; The injection amount of its gaseous ammonia in tail gas depends on the 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 through a liquid control valve (much littler 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 of injecting the excessive pollution that causes ammonia of gaseous ammonia, can be because of 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 the preferred implementation of the utility model; Should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the utility model know-why, can also make some improvement and replacement, these improvement and replacement also should be regarded as the protection domain of the utility model.
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 order; Said 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 with the mode of air-stream type or high-pressure fog with spraying urea liquid, under the effect of high-temperature tail gas, produces gaseous ammonia; Said 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 the particulate solid in the exhaust gases of internal combustion engines with the mode of filtering; Be provided with catalyst carrier in the said 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 order; In the casing gaseous ammonia generation system is set before said, in the said middle casing particulate matter is set and removes system, in the said 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; Said 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, said urea-water solution pipe links to each other with the urea-water solution storage tank that is contained with urea-water solution, and said 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 said 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; Said 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, said 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 said, and said winding-up pipe links to each other with said external compression air.
6. tail gas purification device of combustion engine as claimed in claim 5 is characterized in that, said winding-up pipe links to each other with the pressurized air supply tube through the pressurized air bypass duct; Be disposed with winding-up steam supply valve, compressed air reservoir and electromagnetic impulse valve on the said pressurized air bypass duct; Said electromagnetic impulse valve links to each other with the winding-up controller through pilot; The air supply that the control of winding-up steam supply valve gets into compressed air reservoir; The winding-up controller sends power on signal through 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, said middle box back is provided with the winding-up nozzle, and said winding-up nozzle links to each other with said 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 said middle casing, and said filter cylinder card central part is a circular port, and outward edge shape and middle cabinets cavity shape of cross section are complementary; On the said filter cylinder card filter cylinder filter element is installed, said 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, said 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; Said 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; Said rear box rear end is equipped with backboard, and said backboard is provided with the hole of four and sizes corresponding with the ceramic catalytic cell position less than the ceramic catalytic unit, to prevent ceramic catalytic unit play.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220070957XU CN202493322U (en) | 2012-02-29 | 2012-02-29 | Tail gas purification device of internal combustion engine |
Applications Claiming Priority (1)
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| CN201220070957XU CN202493322U (en) | 2012-02-29 | 2012-02-29 | Tail gas purification device of internal combustion engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291419A (en) * | 2012-02-29 | 2013-09-11 | 北京市劳动保护科学研究所 | Tail gas purification device for internal combustion engine |
| CN106640306A (en) * | 2016-09-27 | 2017-05-10 | 浙江工业大学 | Tail gas purification device of non-road mobile machinery |
| CN108561210A (en) * | 2018-01-24 | 2018-09-21 | 大连海事大学 | Marine diesel pollutant emission processing system |
-
2012
- 2012-02-29 CN CN201220070957XU patent/CN202493322U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291419A (en) * | 2012-02-29 | 2013-09-11 | 北京市劳动保护科学研究所 | Tail gas purification device for internal combustion engine |
| CN103291419B (en) * | 2012-02-29 | 2015-12-16 | 北京市劳动保护科学研究所 | A kind of tail gas purification device of combustion engine |
| CN106640306A (en) * | 2016-09-27 | 2017-05-10 | 浙江工业大学 | Tail gas purification device of non-road mobile machinery |
| CN108561210A (en) * | 2018-01-24 | 2018-09-21 | 大连海事大学 | Marine diesel pollutant emission processing system |
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