CN105771648A - Ammonia production method and device capable of improving SCR denitration efficiency - Google Patents
Ammonia production method and device capable of improving SCR denitration efficiency Download PDFInfo
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- CN105771648A CN105771648A CN201610326154.9A CN201610326154A CN105771648A CN 105771648 A CN105771648 A CN 105771648A CN 201610326154 A CN201610326154 A CN 201610326154A CN 105771648 A CN105771648 A CN 105771648A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/026—Preparation of ammonia from inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/14—Magnesium hydroxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
Abstract
The invention discloses an ammonia production method and device capable of improving SCR denitration efficiency. The ammonia production device is characterized in that a cylindrical pipe barrier formed by arranging cylindrical pipes in a row is arranged at the front part of each of an upper catalyst layer and a lower catalyst layer in an SCR denitration reactor; magnesium metal powder is sprayed into the cylindrical pipes according to the set rate to form nitrogen fixation reaction in pipe cavities; N2 in smoke under a high-temperature condition reacts with magnesium metal to form Mg2N3; and NH3 generated after dissolution reaction of Mg2N3 and water is fed back to an ammonia spraying grating and reapplied to SCR denitration. N2 concentration is effectively reduced in the SCR denitration reactor; NO and NH3 reaction toward a positive direction is facilitated; and meanwhile, self-production of NH3 is achieved. The device is simple in structure and can be widely applied to an SCR reactor in a coal-fired power plant; the denitration efficiency is improved; and 'ultra-low emission' can be achieved under the condition of not adding a layer of denitration catalyst to the power plant.
Description
Technical field
The present invention relates to a kind of ammonia method processed improving SCR denitration efficiency and device, belong to power-plant flue gas Treatment process field, be used for improving NOxRemoval efficiency and reduction reducing agent NH3Make consumption.
Background technology
SCR SCR denitration technology, is by certain density NH3Spray in flue and mix with flue gas, in the reactor catalyzed dose of effect, by NH3And NOxReaction generates nontoxic N2And H2O, reaches NOxThe purpose of elimination.Because of technology maturation, denitration efficiency height, it is acknowledged as maximally effective coal-fired flue gas denitration method.The economy of high activity and operation in order to maintain catalyst, the commonly used high dirt arrangement of existing SCR denitration system, it is arranged between boiler economizer and air preheater by SCR reactor.The non-removing dust of flue gas owing to flowing through this position, contains the dust granules of high concentration in flue gas, therefore, SCR denitration abrasion, blocking become the difficult problem that this arrangement denitrating system faces.Additionally, because import straight pipeline in denitration scene is substantially very short, spray ammonia uniformity, flow field uniformity cause NH3/NOxMixed effect is bad, Outlet Section NOxConcentration representative poor, causes denitration efficiency low, and the escaping of ammonia exceeds standard and the series of problems such as air preheater blocking.
" minimum discharge " is to NO in flue gasxConcentration of emission require it is not higher than 50 milligrams/cubic metre under benchmark oxygen content 6% condition, this brings bigger pressure to the operation of current SCR denitration device, under ensureing high denitration efficiency, import NH3/NOxMol ratio, outlet NOxDistribution consistency degree and the escaping of ammonia rate control more difficult.Current coal-burning power plant denitrating system realizes NOxThe most common practice of " minimum discharge " is exactly that spare level installs catalyst additional, but this mode suffers from the drawback that one, adds denitrating system expense.For 1,000,000 units, increase by one layer of catalyst volume and be about 370m3, expense is about 4,000,000.Two, SCR system resistance increases.After installing spare level catalyst additional, Benitration reactor resistance increase about 200Pa, cause that air-introduced machine power consumption increases, operating cost improves.Three, SO2/SO3Conversion ratio raises.Three layers catalyst runs the SO of system2/SO3Conversion ratio is it is difficult to ensure that within 1%, cause that downstream air preheater easily blocks.Four, waste catalyst treating capacity is added.The waste catalyst treating capacity of half can be increased.
In actual denitration engineering, power plant takes certain strategy problem to solve above-mentioned denitrating system: including: configuration dynamic mixer, FBE ammonia vortex mixer, dalta wing static mixer etc. improve NH3/NOxMixing ratio.But this type of technology has problems, including: if a flow Field Design is bad, it is easy to cause system dust stratification, or resistance increases too greatly power consumption and the steel construction consumption of system.Two, spray ammonia optimization Test and the simulation of CFD flue are carried out.This measure can optimize flow field and spray ammonia effect, but exist simulation and optimize costly, the problem such as frequency is high, it is impossible to fundamentally solving problem.Three, spare level catalyst is increased.NO can be directly realized byx≤ 50 milligrams/cubic metre, but also bring along problem described in leading portion.Four, online water rinses and is difficult to be dried in time after fouling air preheater heat accumulating element rinses, and causes to examine and steps on steel corrosion and get rusty Burr Problem, and and flue dust harden the very intractable solids of formation.Five, denitrification reducing agent consumption is controlled.Urea pyrolysis furnace system and the mode that sprays into are optimized by some power plant, but in order to realize NOxQualified discharge, it is achieved the acquisition of subsidy electricity price, some power plant are difficult to resolve denitrification reducing agent makes consumption and NOxBalance between qualified discharge.Six, the blow loss problem of catalyst.Catalyst is carried out hardening and wear-resistant process.Above-mentioned technical barrier, except not solving very well, there is also a common problem, it is simply that is all solve some problem of local from single aspect, seldom has the multiple problems removing to resolve whole denitrating system from comprehensive and economic angle.
Summary of the invention
The present invention is for avoiding the weak point existing for above-mentioned prior art, it is provided that a kind of ammonia method processed improving SCR denitration efficiency and device, at the NO improving SCR denitration devicexWhile removal efficiency, it is achieved certainly prepare reducing agent NH3, guard catalyst, reduces the escaping of ammonia rate, it is possible to be not added with layer and realize NOx" minimum discharge ", thus improving stability and the economy that whole denitrification apparatus runs.
The present invention solves that technical problem adopts the following technical scheme that
The present invention improves the ammonia method processed of SCR denitration efficiency, and it is characterized in that: be respectively provided with the cylindrical tube barrier being in a row made up of cylindrical tube together in SCR denitration reactor before upper and lower two catalyst layers；Cylindrical tube sprays into metal magnesium powder by the velocity of variation set, forms fixed nitrogen reaction tube intracavity, the under the high temperature conditions N in flue gas2Mg is reacted into magnesium metal2N3, by Mg2N3The NH generated after reacting with water dissolution3Return to ammonia-spraying grid, be reused for SCR denitration.
The present invention improves the ammonia-preparing device of SCR denitration efficiency, and its feature lies also in:
The each Rotating fields arranged in SCR reactor is:
Being positioned at the flow straightening grid that the top of SCR reactor is connected with inlet flue duct, the configured ammonia-spraying grid in flue of flue gas imports the inner chamber of SCR reactor on flow straightening grid；
It is positioned at the reserved layer of the catalyst below described flow straightening grid；
Being positioned at the first cylindrical tube below the reserved layer of described catalyst, described first cylindrical tube has set many in a row in same level, forms first cylindrical tube barrier；
It is positioned at the ground floor catalyst layer below described first cylindrical tube barrier；
Being positioned at the second cylindrical tube below described ground floor catalyst layer, described second cylindrical tube has set many in a row in same level, forms second cylindrical tube barrier；
It is positioned at the second layer catalyst layer below described second cylindrical tube barrier；
Described first cylindrical tube has version identical as follows with second cylindrical tube: body be four layers nested, described four layers of nested ecto-entad are successively: outer layer, filter course, internal layer and core layer, described outer layer and internal layer are the hollow out pipe that can cross flue gas, and described filter course is filtrating smoke dust layer；Described core layer is the molecular sieve layer for separation of nitrogen and oxygen, described core layer constitute oxygen collection lumen, forms fixed nitrogen and react tube chamber between described internal layer and core layer；
The arrival end that described first cylindrical tube reacts tube chamber with the fixed nitrogen in second cylindrical tube is connected with external metal magnesium powder source, the port of export is accessed by delivery pump and dissolves reaction tank, it is arranged on the ammonia letter shoot dissolved above reaction tank to be connected with ammonia-spraying grid, utilizes ammonia letter shoot to import ammonia-spraying grid by dissolving the ammonia recycle generated in reaction tank；Described first cylindrical tube is connected with oxygen storage tank by air pump at the port of export with oxygen collection lumen in second cylindrical tube.
The present invention improves the ammonia-preparing device of SCR denitration efficiency, and its feature also resides in: the diameter arranging described first cylindrical tube is 10cm, controls the gap between adjacent two first cylindrical tube, so that the resistance of first cylindrical tube barrier is less than 150 handkerchiefs；The second cylindrical tube barrier formed by described second cylindrical tube and described first cylindrical tube barrier have identical version.
The present invention improves the ammonia-preparing device of SCR denitration efficiency, and its feature also resides in: be provided above telescopic first soot blower at described first cylindrical tube barrier, for blowing away the surface laying dust on first cylindrical tube barrier；It is provided above telescopic second soot blower, for blowing away the surface laying dust on second cylindrical tube barrier at described second cylindrical tube barrier.
Flue gas enters denitration SCR Reactor inlet flue, after the ammonia sprayed into ammonia-spraying grid mixes, pass sequentially through flow straightening grid and the reserved layer of catalyst arrives first cylindrical tube barrier, flue gas filters out through outer layer, filter course and internal layer in first cylindrical tube barrier and carries out fixed nitrogen reaction tube chamber in flue gas after flue dust, with spraying into the metal magnesium powder that fixed nitrogen reacts in tube chamber, chemical reaction at high temperature occurs: Mg+N2=Mg3N2, generating the magnesium nitride of yellow, the oxygen being in contained by fixed nitrogen reaction tube chamber 1%～2% is quickly removed by the molecular sieve of core layer, and nitrogen is because being difficult to the micropore aperture by molecular sieve, it is achieved the separation of oxygen and nitrogen.Compared with the prior art, the present invention has the beneficial effect that:
1, SCR denitration reactor denitration efficiency it is effectively improved.Metal magnesium powder is at fixed nitrogen reaction tube intracavity generation chemical reaction: Mg+N2=Mg3N2, reduce N in SCR denitration reactor2Concentration, is conducive to SCR denitration fundamental reaction to carry out to positive direction.
2, effective guard catalyst, it is to avoid directly by flue dust impact injury.Before two row's cylindrical tube barriers are arranged in two-layer catalyst, effective combing flue gas distributes, and intercepts bulk " puffed rice " shape ash block, stops catalyst erosive wear.
3, circulation is realized from preparing NH3, what reduce reducing agent ammonia makes consumption.In cylindrical tube, reaction product is delivered to dissolve and meets the chemical reaction Mg that water occurs in reaction tank3N2+6H2O=3Mg (OH)2+2NH3, the NH of generation3Again in conveying ammonia-spraying grid pipeline.
4, it is effectively increased ammonia nitrogen mol ratio and reduces the escaping of ammonia.The effective combing flue gas of two rows cylindrical tube barrier, improves ammonia and flue gas mole mixing uniformity, improves reaction efficiency, reduces the escaping of ammonia.
5, the expense that the improvement of this device increases is few, it is easy to implementing, resistance is less, solves multiple problems of SCR denitration system well, does not increase catalyst and can realize " minimum discharge " target.
6, metal magnesium powder generation chemical reaction Mg+N in cylindrical tube2=Mg3N2It is exothermic reaction, improves reactor temperature, it is ensured that catalyst bringing normally into operation.
7, this device is simultaneously generated by-product Mg (OH)2Solution and oxygen can store utilization respectively, add the income of power plant.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural representation；
Fig. 2 is cylindrical tube section structure schematic diagram in present configuration；
Number in the figure: 1 ammonia-spraying grid, 2 is SCR reactor, 3 flow straightening grids, 4a first soot blower, 4b second soot blower, 5a first flow valve, 5b second flow valve, 6a first cylindrical tube, 6b second cylindrical tube, 7a ground floor catalyst layer, 7b second layer catalyst layer, 8 air pumps, 9 delivery pumps, 15 dissolve reaction tank, 16 agitators, 17 ammonia letter shoots, 18 solution transfer pumps, 19 oxygen storage tanks, 20 fluid reservoirs, layer reserved by 21 catalyst, 22 outer layers, 23 filter courses, 24 internal layers, 25 core layers.
Detailed description of the invention
The ammonia method processed improving SCR denitration efficiency in the present embodiment is to be respectively provided with the cylindrical tube barrier being in a row made up of cylindrical tube together in SCR denitration reactor before upper and lower two catalyst layers；Cylindrical tube sprays into metal magnesium powder by the velocity of variation set, forms fixed nitrogen reaction tube intracavity, the under the high temperature conditions N in flue gas2Mg is reacted into magnesium metal2N3, by Mg2N3The NH generated after reacting with water dissolution3Return to ammonia-spraying grid, be reused for SCR denitration.
Referring to Fig. 1, improving the ammonia-preparing device of SCR denitration efficiency in the present embodiment, to be each Rotating fields arranged in SCR reactor 2 be: being positioned at the flow straightening grid 3 that the top of SCR reactor 2 is connected with inlet flue duct, the configured ammonia-spraying grid 1 in flue of flue gas imports the inner chamber of SCR reactor 2 on flow straightening grid 3；It is positioned at the reserved layer 21 of the catalyst below flow straightening grid 3；Being positioned at the first cylindrical tube 6a below the reserved layer 21 of catalyst, first cylindrical tube 6a has set many in a row in same level, forms first cylindrical tube barrier；It is positioned at the ground floor catalyst layer 7a below first cylindrical tube barrier；Being positioned at the second cylindrical tube 6b below ground floor catalyst layer 7a, second cylindrical tube 6b has set many in a row in same level, forms second cylindrical tube barrier, and is positioned at the second layer catalyst layer 7b below second cylindrical tube barrier.
As shown in Figure 2, in the present embodiment, first cylindrical tube 6a with the version of second cylindrical tube 6b is: body be four layers nested, four layers of nested ecto-entad are successively: outer layer 22, filter course 23, internal layer 24 and core layer 25, outer layer 22 and internal layer 24 are the hollow out pipe that can cross flue gas, and filter course 23 is filtrating smoke dust layer；Core layer 25 is the molecular sieve layer for separation of nitrogen and oxygen, core layer 25 constitute oxygen collection lumen, forms fixed nitrogen and react tube chamber between internal layer 24 with core layer 25；
The arrival end that first cylindrical tube 6a reacts tube chamber with the nitrogen in second cylindrical tube 6b is connected with external metal magnesium powder source, the port of export is accessed by delivery pump 9 and dissolves reaction tank 15, it is arranged on the ammonia letter shoot 17 dissolved above reaction tank 15 to be connected with ammonia-spraying grid 1, utilize ammonia letter shoot 17 to import ammonia-spraying grid 1 by dissolving ammonia recycle angry in reaction tank 15, dissolve reaction tank 15；In first cylindrical tube 6a and second cylindrical tube 6b, oxygen collection lumen is connected with oxygen storage tank 19 by air pump 8 at the port of export.
In being embodied as, the diameter arranging first cylindrical tube 6a is 10cm, controls the gap between adjacent two first cylindrical tube 6a, so that the resistance of first cylindrical tube barrier is less than 150 handkerchiefs；The second cylindrical tube barrier formed by second cylindrical tube 6b and first cylindrical tube barrier have identical version.
As it is shown in figure 1, in the present embodiment, it is provided above telescopic first soot blower 4a at first cylindrical tube barrier, for blowing away the surface laying dust on first cylindrical tube barrier；It is provided above telescopic second soot blower 4b, for blowing away the surface laying dust on second cylindrical tube barrier at second cylindrical tube barrier.
The ammonia mixing sprayed in the flue gas first ammonia-spraying grid 1 of inlet flue duct, pass sequentially through flow straightening grid 3 again and the reserved layer 21 of catalyst arrives the first cylindrical tube barrier being made up of first cylindrical tube 6a, in first cylindrical tube 6a, flue gas sequentially passes through outer layer 22, filter course 23 and internal layer 24 and filters out in flue gas and to enter fixed nitrogen reaction tube chamber after flue dust, reacts in tube chamber at fixed nitrogen, with the metal magnesium powder sprayed into, chemical reaction at high temperature occurs: Mg+N2=Mg3N2Produce magnesium nitride, be in fixed nitrogen reaction tube chamber in flue gas in 1%～2% oxygen rapidly removed by core layer 25 molecular sieve, the internal capillary distribution 0.28～0.38nm of molecular sieve, in this pore size range, oxygen can be diffused in hole quickly through micropore aperture, and nitrogen is difficult to by micropore aperture, thus reaching oxygen, nitrogen separation.Outer layer 22 and internal layer 24 are with the metal material of high temperature resistant, erosion resistant for material, for hollow-out layer, form supporting construction；Filter course 23 material is politef, the molecular sieve that core layer 25 is is material with resistant to elevated temperatures Exocarpium cocois (Cocos nucifera L), coal and resin compound, and molecular sieve internal capillary is distributed as 0.28～0.38nm, for nitrogen in separating flue and oxygen.In being embodied as, outer layer 22, filter course 23 and internal layer 24 mutual distance relatively go up, and essentially phase intussusception maintains certain distance between internal layer 24 and core layer 25, so that ensureing the flow of the metal magnesium powder needed.
When flue gas is by ground floor catalyst layer 7a, the main chemical reaction occurred on ground floor catalyst is 4NO+4NH3+O2=4N2+6H2O, flue gas, when arriving the second cylindrical tube barrier formed by second cylindrical tube, carries out according to flow process same on first cylindrical tube barrier.
After the chemistry of nitrogen fixation on twice cylindrical tube barrier reacts, the concentration of the nitrogen in SCR reactor has had certain reduction, thus promote that on catalyst, main chemical reaction carries out to positive direction, be conducive to improving denitration efficiency, flue gas and ammonia obtain abundant combing through twice cylindrical tube simultaneously, effectively extend mixing distance, improve ammonia nitrogen mixed in molar ratio, be conducive to occurring on a catalyst chemical reaction, improve denitration efficiency to a certain extent.
Estimate that the present invention puies forward effect by above-mentioned two step denitrations through laboratory simulation, denitration efficiency about 3.6% can be increased, reduce amount of ammonia slip 1.6ppm simultaneously, ammonia-spraying grid 1 ammonia spraying amount can be strengthened further, it is achieved the SCR denitration reactor outlet NO of two-layer catalystxThe emissions object of≤50 milligrams/cubic metre (6% benchmark oxygen).Two-layer cylindrical tube barrier resistance is about 300 handkerchiefs simultaneously, increases resistance relatively small.
In the present embodiment, it is also possible to by arranging first flow valve 5a in the porch of first cylindrical tube 6a, second flow valve 5b is set in the porch of second cylindrical tube 6b, according to N in flue gas2What content and flue gas flow controlled metal magnesium powder sprays into speed.The yellow magnesium nitride powder that chemical reaction generates in first cylindrical tube 6a and second cylindrical tube 6b is delivered in dissolving reaction tank 15 by powder conduit road through delivery pump 9, with water, following chemical reaction: Mg occurs in dissolving reaction tank 15 under the stirring of agitator 163N2+6H2O=3Mg (OH)2+2NH3, the NH of production3Again ammonia-spraying grid 1 place it is delivered to, for denitration reaction by ammonia letter shoot 17.
Table 1
| 1 kilogram of magnesium powder price | Preparing ammonia air volume | Generate Mg (OH)2Mole | Oxygen volume |
| 12.74 it is first | 7907L | 530mol | 47.9L |
Shown in table 1, often reaction consumes 1 kilogram of magnesium powder and is approximately 530mol, according to chemical equation, generates about 353mol ammonia, is about 7907L in mark condition lower volume, is simultaneously generated 530molMg (OH)2, according to the 167molN consumed2, estimate according to 78: 1, extract O2For 47.9L.1 kilogram of magnesium powder price is approximately 12.74 yuan, it is clear that this device technique flow process input-output ratio is high, Mg (OH)2Delivering in fluid reservoir 20 through solution transfer pump 18, the oxygen extracted through air pump 8 is delivered to oxygen storage tank 19.
When the draft of air pump 8 increases, it is necessary to first soot blower 4a and second soot blower 4b is stretched in SCR reactor 2, the superficial dust of upper and lower twice cylindrical tube is purged, in order to flue gas can enter smoothly and chemical reaction occurs in pipe.Stop spraying into magnesium powder in first cylindrical tube 6a and second cylindrical tube 6b, in pipe, pass into pressure-air, hocket with sonic soot blowing.
Claims (4)
1. improve an ammonia method processed for SCR denitration efficiency, it is characterized in that: in SCR denitration reactor, before upper and lower two catalyst layers, be respectively provided with the cylindrical tube barrier being in a row made up of cylindrical tube together；Cylindrical tube sprays into metal magnesium powder by the velocity of variation set, forms fixed nitrogen reaction tube intracavity, the under the high temperature conditions N in flue gas2Mg is reacted into magnesium metal2N3, by Mg2N3The NH generated after reacting with water dissolution3Return to ammonia-spraying grid, be reused for SCR denitration.
2. improve an ammonia-preparing device for SCR denitration efficiency, it is characterized in that:
The each Rotating fields arranged in SCR reactor (2) is:
Being positioned at the flow straightening grid (3) that the top of SCR reactor (2) is connected with inlet flue duct, the configured ammonia-spraying grid (1) in flue of flue gas is at the upper inner chamber importing SCR reactor (2) of flow straightening grid (3)；
It is positioned at the reserved layer (21) of catalyst of described flow straightening grid (3) lower section；
Being positioned at the first cylindrical tube (6a) of reserved layer (21) lower section of described catalyst, described first cylindrical tube (6a) has set many in a row in same level, forms first cylindrical tube barrier；
It is positioned at the ground floor catalyst layer (7a) below described first cylindrical tube barrier；
Being positioned at the second cylindrical tube (6b) of described ground floor catalyst layer (7a) lower section, described second cylindrical tube (6b) has set many in a row in same level, forms second cylindrical tube barrier；
It is positioned at the second layer catalyst layer (7b) below described second cylindrical tube barrier；
Described first cylindrical tube (6a) has version identical as follows with second cylindrical tube (6b): body be four layers nested, described four layers of nested ecto-entad are successively: outer layer (22), filter course (23), internal layer (24) and core layer (25), described outer layer (22) and internal layer (24) are the hollow out pipe that can cross flue gas, and described filter course (23) is filtrating smoke dust layer；Described core layer (25) is the molecular sieve layer for separation of nitrogen and oxygen, constituted oxygen collection lumen by described core layer (25), between described internal layer (24) with core layer (25), form fixed nitrogen react tube chamber；
The arrival end that described first cylindrical tube (6a) reacts tube chamber with the fixed nitrogen in second cylindrical tube (6b) is connected with external metal magnesium powder source, the port of export is accessed by delivery pump (9) and dissolves reaction tank (15), it is arranged on the ammonia letter shoot (17) dissolving reaction tank (15) top to be connected with ammonia-spraying grid (1), utilizes ammonia letter shoot (17) that the ammonia recycle generated in reaction tank (15) will be dissolved and import ammonia-spraying grid (1)；Described first cylindrical tube (6a) is connected with oxygen storage tank (19) by air pump (8) at the port of export with oxygen collection lumen in second cylindrical tube (6b).
3. the ammonia-preparing device of raising SCR denitration efficiency according to claim 2, it is characterized in that: the diameter arranging described first cylindrical tube (6a) is 10cm, control the gap between adjacent two first cylindrical tube (6a), so that the resistance of first cylindrical tube barrier is less than 150 handkerchiefs；The second cylindrical tube barrier formed by described second cylindrical tube (6b) and described first cylindrical tube barrier have identical version.
4. the ammonia-preparing device of raising SCR denitration efficiency according to claim 2, is characterized in that: be provided above telescopic first soot blower (4a) at described first cylindrical tube barrier, for blowing away the surface laying dust on first cylindrical tube barrier；It is provided above telescopic second soot blower (4b), for blowing away the surface laying dust on second cylindrical tube barrier at described second cylindrical tube barrier.
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| CN205586835U (en) * | 2016-05-13 | 2016-09-21 | 安徽新力电业科技咨询有限责任公司 | Efficiency of SCR denitration is improved system ammonia device |
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2016
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| US5603909A (en) * | 1995-08-03 | 1997-02-18 | The Babcock & Wilcox Company | Selective catalytic reduction reactor integrated with condensing heat exchanger for multiple pollutant capture/removal |
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| CN101637700A (en) * | 2009-08-14 | 2010-02-03 | 中电投远达环保工程有限公司 | SCR denitrification process and denitrification device of ammonia injection grid adopting non-unidiameter injection orifices |
| CN102921297A (en) * | 2012-11-21 | 2013-02-13 | 江苏中建材环保研究院有限公司 | SCR denitrification device for dedusting smoke of cement kiln at high temperature |
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