CN103291419B - A kind of tail gas purification device of combustion engine - Google Patents
A kind of tail gas purification device of combustion engine Download PDFInfo
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- CN103291419B CN103291419B CN201210050162.7A CN201210050162A CN103291419B CN 103291419 B CN103291419 B CN 103291419B CN 201210050162 A CN201210050162 A CN 201210050162A CN 103291419 B CN103291419 B CN 103291419B
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- tail gas
- urea
- gaseous ammonia
- filter cylinder
- 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
Abstract
The invention discloses 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 are connected in turn; Gaseous ammonia generation system front end is connected with internal combustion engine tail gas discharge mouth, in the mode of air-stream type or high-pressure fog, spraying urea liquid is become imperceptible vaporific, under the effect of high-temperature tail gas, produces gaseous ammonia; Particulate matter is removed system front end and is connected with gaseous ammonia generation system, and rear end is connected with catalytic reaction system, removes the particulate solid in exhaust gases of internal combustion engines in the mode of filtering; Catalyst carrier is provided with, the catalyzer of coating needed for reduction reaction on it in catalytic reaction system.Apparatus of the present invention structure is simple, volume is little, lightweight, only need the air-stream type spraying device of a set of exquisiteness or high pressure sprays fog equipment can realize gaseous ammonia systematic function, practical; Fundamentally solve the safety issue of selective catalytic reduction; Solve the disadvantage of the gaseous ammonia growing amount instability of selective catalytic reduction.
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 introduced for diesel engine, include gaseous state and solid-state pollutant in the waste gas of diesel emission, in gaseous contaminant, be mainly NO
x, SO
2, CO, HC, oxide, organic nitrogen compound and sulfur-containing mixture etc.; Solid contaminant is carbonized particle thing most importantly.In above-mentioned pollutant, most importantly NO
x, CO, SO
2, HC and solid particle (pm).In the prior art, the method purifying above-mentioned gaseous contaminant mainly adopts selective catalytic reduction (SelectiveCatalyticReduction is called for short SCR) to purify NO in gaseous contaminant
xand CO; When adopting in this way, reactant is gaseous ammonia (NH3).In order to the method obtaining gaseous ammonia adopts ammoniacal liquor at normal temperatures (because there is receptance between ammonia growing amount and temperature, require that control temperature scope is very narrow, temperature height ammonia 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 ammonia vaporizer, ammonia knock out drum, gas flow valve etc., these devices relatively and diesel engine say, seem that volume is too huge, ammonia is a kind of explosion hazard gases simultaneously, if ammonia in atmosphere concentration is in the scope of 5% ~ 15%, meet naked light and collapsing force and dangerous all very large blast can occur, exhaust emissions of diesel engine place is in the condition of high temperature, therefore, ammonia vaporizer is adopted in diesel engine exhaust gas purification device, it is unpractical and dangerous that ammonia knock out drum etc. obtains gaseous ammonia.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention how to realize the tail gas that combustion motor discharges safely and efficiently to process in time, is discharged in air pollutes to avoid it.
(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 are connected in turn; Described gaseous ammonia generation system front end is connected with internal combustion engine tail gas discharge mouth, rear end and particulate matter are removed system and are connected, spraying urea liquid is become imperceptible vaporific in the mode of air-stream type or high-pressure fog by gaseous ammonia generation system, under the effect of high-temperature tail gas, produce gaseous ammonia; Described particulate matter is removed system front end and is connected with gaseous ammonia generation system, and rear end is connected with catalytic reaction system, removes the particulate solid in exhaust gases of internal combustion engines in the mode of filtering; Be provided with catalyst carrier in described catalytic reaction system, its inwall apply the catalyzer needed for reduction reaction.
Wherein, comprise and connecting in turn and through front casing, middle casing and rear box, in described front casing, gaseous ammonia generation system is set, particulate matter is set in described middle casing and removes system, in described rear box, catalytic reaction system is set.
Wherein, described gaseous ammonia generation system comprises the air-stream type shower nozzle be arranged in front casing, and the urea-water solution pipe to be connected respectively with the interface of air-stream type shower nozzle and pressurized air supply tube, described urea-water solution pipe is connected with the urea-water solution storage tank being contained with urea-water solution, and described pressurized air supply tube is connected with external compression air; Described urea-water solution pipe and pressurized air supply tube are respectively arranged with liquid inventory control valve and compressed air control valve.
Wherein, described gaseous ammonia generation system comprises the pressure spray type spray nozzle be arranged in front casing, and the urea-water solution pipe, liquid inventory control valve, the high-pressure gear pump that are connected respectively with the interface of pressure spray type spray nozzle and be contained with the urea-water solution storage tank of urea-water solution.
Wherein, casing before described middle casing front end connects, rear end connects rear box, and bottom connects taper ash bucket, and hopper bottom installs the grey nut of lock; Described middle box back is also connected with injection tube, and described injection tube is connected with described external compression air.
Wherein, described injection tube is connected with pressurized air supply tube by pressurized air bypass duct; Described pressurized air bypass duct is disposed with winding-up steam supply valve, compressed air reservoir and electromagnetic impulse valve, described electromagnetic impulse valve is connected with winding-up controller by pilot, winding-up steam supply valve controls the air supply entering compressed air reservoir, winding-up controller send power on signal by pilot to electromagnetic impulse valve, control electromagnetic impulse valve open with by injection tube to blowing gas in middle casing.
Wherein, described middle box back is provided with blast nozzle, and described blast nozzle is connected with described injection tube.
Wherein, be provided with filter cylinder card in described middle casing, described filter cylinder card central part is circular port, and outward edge shape and middle cabinets cavity shape of cross section match; Described filter cylinder card is provided with filter cylinder filter element, blind plate before described filter cylinder filter element comprises the filter cylinder being arranged on middle casing front end, be arranged on middle box back filter cylinder ring flat-plate, with filter cylinder before blind plate and filter cylinder ring flat-plate form the stainless steel filter felt of cylindrical cavities and be separately positioned on filter cylinder internal layer catch net and the filter cylinder outer layer protection net of stainless steel filter felt inside and outside wall.
Wherein, in the middle part of described rear box, be provided with cross partition, rear box cross section be divided into four equidimension spaces, a ceramic catalytic unit is set in each equidimension space.
Wherein, described ceramic catalytic unit be one along its longitudinally offer multiple square duct and on the inwall of its square duct the ceramic catalyst carrier of coated catalysts, each ceramic catalytic unit surrounding is wrapped up in the shockproof felt of glass, prevents ceramic catalytic unit impaired in case of shock.
Wherein, described rear box rear end is provided with backboard, described backboard is provided with the hole that four and sizes corresponding with ceramic catalytic cell position are less than 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, lightweight, only needs the air-stream type spraying system of a set of exquisiteness or press atomization system to realize gaseous ammonia systematic function, practical; Fundamentally solve the safety issue of selective catalytic reduction; Solve the disadvantage of the gaseous ammonia growing amount instability of selective catalytic reduction.
Accompanying drawing explanation
Fig. 1 is the structural representation of the tail gas purification device of combustion engine of the embodiment of the present invention 1;
Fig. 2 is the A-A sectional drawing in Fig. 1;
Fig. 3 is the B-B sectional drawing in Fig. 1;
Fig. 4 is the structural representation of the tail gas purification device of combustion engine of the embodiment of the present invention 2.
Wherein, 1: lock grey nut; 2: ash bucket; 3: front raising middle flask fixing bolt group; 4: stainless steel filter felt; 5: blind plate before filter cylinder; 6: air-stream type shower nozzle; 7: diesel engine vent gas comb; 8: front casing; 9: urea--aqueous suction pipes; 10: liquid inventory control valve; 11: urea--the aqueous solution; 12: urea--aqueous solution storage tank; 13: compressed air control valve; 14: pressurized air supply tube; 15: pressurized air bypass duct; 16: winding-up steam supply valve; 17: compressed air reservoir; 18: winding-up controller; 19: electromagnetic impulse valve; 20: pilot; 21: middle casing; 22: injection tube; 23: filter cylinder outer layer protection net; 24: filter cylinder internal layer catch net; 25: blast nozzle; 26: rear box; 27: the shockproof felt of glass; 28: ceramic catalytic unit; 29: cross dividing plate; 30: backboard; 31: whole floss hole; 32: filter cylinder card; 33: filter cylinder fixing bolt group; 34: middle rear cabinet fixing bolt group; 35: filter cylinder ring flat-plate; 36: high-pressure gear pump; 37: pressure 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 for illustration of the present invention, but are not used for limiting the scope of the invention.
The invention provides a kind of device for diesel engine vent gas purification, this device adopts urea (CON
2h
4)-the aqueous solution enters exhaust gas cleaner inside by pipeline, by air-stream spraying (embodiment 1) or high-pressure fog (embodiment 2) urea-water solution become microlayer model state and fully mix with high-temperature tail gas, urea under the effect of high-temperature tail gas in urea-water solution is heated to rapidly more than 160 DEG C decomposition, 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, and not only ammonia gas generating device volume is little for this method, and Security is high, and can realize the accurate control to ammonia generating capacity by the control of liquid towards urea input quantity.
Embodiment 1
As shown in Figure 1: be 9 liters for discharge capacity, 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, front raising middle flask fixing bolt group 3, stainless steel filter felt 4, blind plate 5 before filter cylinder, air-stream type shower nozzle 6, diesel engine vent gas comb 7, front 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, injection tube 22, filter cylinder outer layer protection net 23, filter cylinder internal layer catch net 24, blast 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, front 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 forms gaseous ammonia generation system, the wherein front casing 8 steel plate sheet metal box body of putting for level, it is anterior is cylindric, intermediate portion is circle side's excessively casing, 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 front raising middle flask fixing bolt group 3, urea-water solution pipe 9 and pressurized air supply tube 14 are inserted respectively for cylindric casing top in its front portion, these two pipeline accesses are positioned at the corresponding interface of the air-stream type shower nozzle 6 at cylindric casing center, the other end of urea-water solution pipe 9 connects bottom urea-water solution storage tank 12, arranges liquid inventory control valve 10 in the middle of urea-water solution pipe, and urea-water solution storage tank 12 is a perpendicular tank body put, and arranges compressed air control valve 13 in the middle of pressurized air supply tube 14,
Formed particulate matter removed 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, injection tube 22, filter cylinder outer layer protection net 23, filter cylinder internal layer catch net 24, blast 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, filter cylinder.Middle casing 21 is the vacant square plate sheet metal box body in the level rear and front end of putting and lower end, and its underrun welding is connected with the steel plate ash bucket 2 of old name for the Arabian countries in the Middle East's ground circle, on the screw thread outside the bottom cylinder locking the steel plate ash bucket that grey nut 1 is justified with being screwed in old name for the Arabian countries in the Middle East; Middle casing 21 front end is connected with front casing 8 by front 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; Within it chamber arranges the filter cylinder card 32 of a square-outside and round-inside steel plate, and the foreign side of this filter cylinder card 32 is welded on middle casing 21 inner chamber position to the rear; The filter cylinder filter element that filter material is stainless steel filter felt 4 is formed by blind plate before filter cylinder 5 filter cylinder ring flat-plate 35, filter cylinder outer layer protection net 23, filter cylinder internal layer catch net 24, stainless steel filter felt 4; wherein before filter cylinder, blind plate 5 is a steel plate rounding blind plate; filter cylinder ring flat-plate 35 is a steel annular steel plate; its inner circle is the air-out passage for outside filtering type filter cylinder; stainless steel filter felt 4 is one be folded into accordion box like and 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 filter cylinder card 32 by filter cylinder fixing bolt group 33.A pressurized air bypass duct 15 is picked out from pressurized air supply tube 14, this pipe arranges a winding-up steam supply valve 16 and supplies pressurized air to compressed air reservoir 17, when the particulate matter amount accumulated on the filtering material of outside filtering type filter cylinder is more than a threshold value, winding-up controller 18 sends a signal by pilot 20 and is energized to electromagnetic impulse valve 19, electromagnetic impulse valve 19 is opened instantaneously, pressurized air in compressed air reservoir is by injection tube 22 winding-up (contrary with tail gas filtering direction) to blast nozzle 25 to outside filtering type filter cylinder inner chamber, realize clearing up the dust stratification be attached on filter layer, dust stratification after cleaned falls into ash bucket 2, wait amassing completely, turn on the grey nut 1 of lock to discharge.
Catalytic reaction system is formed by rear box 26, the shockproof felt of glass 27, ceramic catalytic unit 28, cross dividing plate 29, backboard 30, whole floss hole 31, rear box 26 is that behind a square box and a front, circle box body combinations forms, 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.One cross dividing plate 29 is set in the middle part of rear box 26, rear box 26 square-section is divided into four equidimension square spaces, a ceramic catalytic unit 28 is put in each square space, ceramic catalytic unit 28 is one longitudinally offer the catalyst carrier of many square ducts (sectional dimension is 4.3mm × 4.3mm) along it, the ceramic products of coated catalysts on the inwall of its square duct, it is attached that each ceramic catalytic unit 28 surrounding adopts the shockproof felt of glass 27 to wrap up in, in order to avoid ceramic catalytic unit 28 is impaired in case of shock.Backboard 30 is a square plate, inner uniform four square holes being slightly less than ceramic catalytic unit, plays the effect preventing ceramic catalytic unit play forward.
Embodiment 2
The difference part of the present embodiment and embodiment 1 is, the gaseous ammonia generation system be made up of is replaced by the gaseous ammonia generation system be made up of high-pressure gear pump 36, front 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 in embodiment 1 air-stream type shower nozzle 6, front 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; Spray pattern is sprayed by air-stream type and is replaced by press spray; The wherein front casing 8 steel plate sheet metal box body of putting for level, it is anterior is cylindric, intermediate portion is circle side's excessively casing, 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 front raising middle flask fixing bolt group 3, and it is anterior for inserting for urea-water solution pipe 9 respectively in cylindric casing top, and pipeline access is positioned at the corresponding interface of the pressure spray type spray nozzle 37 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 put.
Above-described embodiment 1 is identical, as follows with the working principle of the device gas for purifying internal combustion engine tail gas of embodiment 2:
When normally working, in embodiment 1, in urea-water solution storage tank, the urea-water solution 11 of 12 enters air-stream type shower nozzle 6 through confession urea-water solution pipe 9, liquid inventory control valve 10 under gravity; Also enter air-stream type shower nozzle 6 by the pressurized air of pressurized air supply tube 14, compressed air control valve 13 simultaneously, in air-stream type shower nozzle 6, pressurized air fully mixes with urea-water solution 11, because compressed-air actuated flow velocity is high, therefore 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 drop and is ejected air-stream type shower nozzle 6, forms the fog-zone that atomic thin urea-water solution 11 drop of a slice is formed.
When normally working, in embodiment 2, in urea-water solution storage tank, the urea-water solution 11 of 12 provides high pressure urea-aqueous solution liquid stream through confession urea-water solution pipe 9, liquid inventory control valve 10 to pressure spray type spray nozzle 37 under the pumping action of high-pressure gear pump 36, presses down at High Pressure the fog-zone that spray type spray nozzle 37 sprays the formation of atomic thin urea-water solution 11 drop.
Diesel engine vent gas enters the anterior cylindric casing of front casing 8 by diesel engine vent gas comb 7, after running into the fog-zone of the atomic thin urea-water solution 11 drop formation of this sheet, rapid mixing, because diesel engine vent gas is high-temperature gas (350 DEG C--about 430 DEG C), therefore atomic thin urea-water solution 11 drop is heated rapidly, moisture wherein evaporates rapidly, urea (CON wherein
2h
4) at high temperature (more than 160 DEG C) decomposition reaction (CON can be there is
2h
4)=(NH
3)+(CONH), produce ammonia (NH
3) and biuret (CONH), the gas and vapor permeation in ammonia wherein and tail gas, there is following chemical reaction with the sulfur dioxide in tail gas in mixing rear portion ammonia, its reaction equation is immediately:
SO
2+H
2O+xNH
3＝(HN
4)xH
2-xSO
3(1)
Obtain ammonium base bisulfite semifinished product, ammonium base bisulfite is oxidized again:
(NH
4)XH
2-XSO
3+1/2O
2+(2-x)NH
3＝(NH
4)2SO
42
Achieve complete dry desulfurization, the end-product ammonium sulfate (NH after desulfurization
4)
2sO
4tiny solid granulates can be formed with biuret after urea decomposition (CONH) to be mixed in tail gas.
The major component that middle casing 21 comprises is that particulate matter removal system is actually the fold cartridge that is filtering material with stainless steel filter felt 4, first blind plate 5 before filter cylinder is run into after remaining the mixed gas of ammonia etc. after tail gas and desulfurization casing 8 entering middle casing 21 front end in the past, it is a steel plate rounding blind plate, mixed gas can't pass, can only detour outer by collapsible stainless steel filter felt 4, then enter filter cylinder inner chamber through collapsible stainless steel filter felt 4, realize filtering.By filtering, the particulate matter in tail gas (is comprised the ammonium sulfate (NH after biuret (CONH) and desulfurization after the particulate matters such as original carbonized particle thing in tail gas and urea decomposition
4)
2sO
4tiny solid granulates) remove.After stainless steel filter felt 4 have accumulated a certain amount of particulate matter, filter layer resistance can be made to strengthen, affect mixed gas to pass through, now by starting winding-up controller 18, send a signal through pilot 20 to be energized to electromagnetic impulse valve 19, electromagnetic impulse valve 19 is opened instantaneously, pressurized air in compressed air reservoir 17 is by injection tube 22, 22 to blast nozzle 25, (contrary with tail gas filtering direction) is jetted to outside filtering type filter cylinder inner chamber by blast nozzle 25, realize the particulate matter that cleaning is attached to the accumulation on stainless steel filter felt 4 skin, particulate matter after cleaned falls into ash bucket 2, after the long-pending full particulate matter of ash bucket 2, turn on the grey nut 1 of lock to discharge.The mixed gas remaining ammonia after removing the tail gas after particulate matter and desulfurization after filtering enters the catalytic reaction system in rear box 26 by the passage of filter cylinder card 32 and filter cylinder ring flat-plate 35 hollow, on the multiple inwalls of mixed gas through ceramic catalytic unit 28 during coated catalysts square duct, under high temperature and catalytic condition, the gaseous ammonia in tail gas mixed gas and nitrogen oxide (comprise NO and NO
2) there is following chemical reaction:
4NH
3+4NO+O
2＝4N
2+6H
2O
8NH
3+6NO
2＝7N
2+12H
2O2
Simultaneously under high temperature and catalytic condition, the carbon monoxide in tail gas mixed gas and nitrogen oxide (comprise NO and NO
2) there is following chemical reaction:
2CO+2NO+O
2＝2CO
2+N
2
4CO+2NO
2＝4CO
2+N
22
By above-mentioned chemical reaction, by the nitrogen of the carbon monoxide in diesel engine vent gas and NO_x formation environmental sound, carbon dioxide and water.To sum up, by above three grades of purifications, by the main gaseous contaminant (NO of diesel emission
x, SO
2, CO) and solid granulates pollutant.Realize the overwhelming majority to remove.Therefore, above structure and process bring following beneficial effect:
(1) apparatus structure is simple, volume is little, lightweight, the air-stream type spraying system of a set of exquisiteness is only needed to realize gaseous ammonia systematic function, replace the gaseous ammonia generation system of the equipment composition that in selective catalytic reduction, ammonia vaporizer, ammonia knock out drum, gas flow valve etc. are huge, this is that mobile pollution source diesel engine is sayed for major part, has more standby practicability.
(2) safety issue of selective catalytic reduction is fundamentally solved
Because selective catalytic reduction produces gaseous ammonia by the evaporation of ammoniacal liquor in ammonia vaporizer be finally mixed in tail gas by gaseous ammonia through ammonia knock out drum again, in this process, the concentration of the gaseous ammonia produced is easy to reach concentration between blast critical zone, there is very high potential safety hazard; And the method that in the present invention, gaseous ammonia produces directly is mixed among high-temperature tail gas by urea-water solution, gaseous ammonia is produced by the decomposition of urea, the concentration that this method generates gaseous ammonia can depart from far away between the concentration blast area of ammonia, thus completely eliminates selective catalytic reduction potential safety hazard.
(3) disadvantage of the gaseous ammonia growing amount instability of selective catalytic reduction is solved
Because selective catalytic reduction thinks highly of generation gaseous ammonia in ammonia evaporation, its production is very responsive to temperature, accurately must control the temperature of ammonia vaporizer, generating capacity can be controlled, also to be cushioned by ammonia knock out drum simultaneously, again with gas control valve adjustment, 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 completely, and concentration very easily controls when configuring, as long as mixed volume just can accurately be controlled by a liquid control valve (more much smaller than gas control valve), and can not change because of the change of temperature conditions.Thus achieve the object accurately controlling to inject tail gas gaseous ammonia.The pollution causing ammonia because injection gaseous ammonia is excessive can not be caused, also can not because injecting the very few NO that cause purification gaseous contaminant of gaseous ammonia
xproblem inefficient with CO.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and replacement, these improve and replace and also should be considered as protection scope of the present invention.
Claims (8)
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 are connected in turn; Described gaseous ammonia generation system front end is connected with internal combustion engine tail gas discharge mouth, rear end and particulate matter are removed system and are connected, spraying urea liquid is become imperceptible vaporific in the mode of air-stream type or high-pressure fog by gaseous ammonia generation system, under the effect of high-temperature tail gas, produce gaseous ammonia; Described particulate matter is removed system front end and is connected with gaseous ammonia generation system, and rear end is connected with catalytic reaction system, removes the particulate solid in exhaust gases of internal combustion engines in the mode of filtering; Be provided with catalyst carrier in described catalytic reaction system, its inwall apply the catalyzer needed for reduction reaction;
Described tail gas purification device of combustion engine, comprises and connecting in turn and through front casing, middle casing and rear box, arrange gaseous ammonia generation system in described front casing, arranges particulate matter and removes system, arrange catalytic reaction system in described rear box in described middle casing;
Be provided with cross partition in the middle part of described rear box, rear box cross section be divided into four equidimension spaces, a ceramic catalytic unit is set in each equidimension space;
Described ceramic catalytic unit be one along its longitudinally offer multiple square duct and on the inwall of its square duct the ceramic catalyst carrier of coated catalysts, each ceramic catalytic unit surrounding is wrapped up in the shockproof felt of glass, prevents ceramic catalytic unit impaired in case of shock.
2. tail gas purification device of combustion engine as claimed in claim 1, it is characterized in that, described gaseous ammonia generation system comprises the air-stream type shower nozzle be arranged in front casing, and the urea-water solution pipe to be connected respectively with the interface of air-stream type shower nozzle and pressurized air supply tube, described urea-water solution pipe is connected with the urea-water solution storage tank being contained with urea-water solution, and described pressurized air supply tube is connected with external compression air; Described urea-water solution pipe and pressurized air supply tube are respectively arranged with liquid inventory control valve and compressed air control valve.
3. tail gas purification device of combustion engine as claimed in claim 1, it is characterized in that, described gaseous ammonia generation system comprises the pressure spray type spray nozzle be arranged in front casing, and the urea-water solution pipe, liquid inventory control valve, the high-pressure gear pump that are connected respectively with the interface of pressure spray type spray nozzle and be contained with the urea-water solution storage tank of urea-water solution.
4. tail gas purification device of combustion engine as claimed in claim 2, is characterized in that, casing before described middle casing front end connects, and rear end connects rear box, and bottom connects taper ash bucket, and hopper bottom installs the grey nut of lock; Described middle box back is also connected with injection tube, and described injection tube is connected with described external compression air.
5. tail gas purification device of combustion engine as claimed in claim 4, is characterized in that, described injection tube is connected with pressurized air supply tube by pressurized air bypass duct; Described pressurized air bypass duct is disposed with winding-up steam supply valve, compressed air reservoir and electromagnetic impulse valve, described electromagnetic impulse valve is connected with winding-up controller by pilot, winding-up steam supply valve controls the air supply entering compressed air reservoir, winding-up controller send power on signal by pilot to electromagnetic impulse valve, control electromagnetic impulse valve open with by injection tube to blowing gas in middle casing.
6. tail gas purification device of combustion engine as claimed in claim 5, it is characterized in that, described middle box back is provided with blast nozzle, and described blast nozzle is connected with described injection tube.
7. tail gas purification device of combustion engine as claimed in claim 1, it is characterized in that, be provided with filter cylinder card in described middle casing, described filter cylinder card central part is circular port, and outward edge shape and middle cabinets cavity shape of cross section match; Described filter cylinder card is provided with filter cylinder filter element, blind plate before described filter cylinder filter element comprises the filter cylinder being arranged on middle casing front end, be arranged on middle box back filter cylinder ring flat-plate, with filter cylinder before blind plate and filter cylinder ring flat-plate form the stainless steel filter felt of cylindrical cavities and be separately positioned on filter cylinder internal layer catch net and the filter cylinder outer layer protection net of stainless steel filter felt inside and outside wall.
8. tail gas purification device of combustion engine as claimed in claim 1, it is characterized in that, described rear box rear end is provided with backboard, described backboard is provided with the hole that four and sizes corresponding with ceramic catalytic cell position are less than ceramic catalytic unit, to prevent ceramic catalytic unit play.
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| CN201210050162.7A CN103291419B (en) | 2012-02-29 | 2012-02-29 | A kind of tail gas purification device of combustion engine |
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|---|---|---|---|
| CN201210050162.7A CN103291419B (en) | 2012-02-29 | 2012-02-29 | A kind of tail gas purification device of combustion engine |
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| JP6479541B2 (en) * | 2015-04-03 | 2019-03-06 | ヤマシンフィルタ株式会社 | strainer |
| CN104771969B (en) * | 2015-04-20 | 2017-01-11 | 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 |
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