CN103776043B - A kind of CO boiler with denitration function - Google Patents
A kind of CO boiler with denitration function Download PDFInfo
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- CN103776043B CN103776043B CN201210408291.9A CN201210408291A CN103776043B CN 103776043 B CN103776043 B CN 103776043B CN 201210408291 A CN201210408291 A CN 201210408291A CN 103776043 B CN103776043 B CN 103776043B
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Abstract
The present invention relates to a kind of CO boiler with denitration function, described boiler includes flue, combustor, steam drum, evaporator section and economizer section, described flue includes the first vertical flue, horizontal flue and the second vertical flue, horizontal flue two ends connect with the first and second vertical flue tops respectively, combustor is arranged in the first vertical flue, steam drum is arranged in horizontal flue, evaporator section and economizer section are arranged in the second vertical flue, wherein: described boiler also includes spray ammonia mixed organization and Benitration reactor, described spray ammonia mixed organization is arranged in the second vertical flue, it is positioned at the top of evaporator section, described Benitration reactor is arranged between evaporator section and economizer section。Boiler of the present invention can be effectively improved flue gas and ammonia mixing homogeneity, improve denitration efficiency and prevent the escaping of ammonia, Benitration reactor being arranged in CO boiler, and without arranging mixed ammonia grid, improve flue gas heat utilization ratio, save plant area space and equipment investment。
Description
Technical field
The present invention relates to a kind of flue gas controller, particularly relate to a kind of CO boiler with denitration function。
Background technology
Nitrogen oxides (NOx) it is one of the primary pollution source of atmospheric pollution, in occupational environment, contact is that several admixture of gas is frequently referred to the smoke of gunpowder (gas), is mainly NO and NO2, with NO2It is main。NOxAll there is toxicity in various degree, with NO and NO2It is main NOxIt it is the major reason forming photochemical fog and acid rain。NO in vehicle exhaustxWith Hydrocarbon through ultraviolet radiation react formed toxic smog, be called photochemical fog。Photochemical fog has special odor, stimulates eyes, injures plant, and atmospheric visibility can be made to reduce。It addition, NOxReact, with the water in air, the nitric acid generated and nitrous acid is the composition of acid rain。NOxThe harm of human body is mainly manifested in infringement respiratory tract。
The whole world enters the NO of air every yearxTotal amount about reaches 50,000,000 tons, 2008, China NOxDischarge capacity has reached 20,000,000 tons, become the first in the world big discharge state。If taking no action to control, it is contemplated that to the year two thousand twenty, NOxDischarge capacity is up to 30,000,000 tons, and China the Eleventh Five-Year Plan period cuts down the effort of sulfur dioxide 10%, also will because of NOxThe notable rising of discharge capacity and all offset。At present, China is by NOx" 12 " period overall control category is included in as the binding indicator。It is discharged into the NO in airxMainly there are three sources: power plant (accounts for 46%), vehicle exhaust (accounting for 49%) and oil-refining chemical factory (accounting for 5%)。
In FCC technique, catalyst granules repeatedly circulates operation between catalytic cracking reaction zone and catalyst regeneration zones, and during regenerating, the coke from cracking reaction on catalyst granules is at high temperature removed by air oxidation, make the activity recovery of catalyst, and in cracking reaction again with。NO in FCC flue gasxEssentially from the burning of coke nitrogenous on catalyst, therefore all can there is NO in the FCC apparatus of all process nitrogen-containing materialsxEmission problem。NO in FCC flue gasxAmount typically constitutes from full factory NOxThe 50% of discharge capacity, is the maximum NO of oil plantxEmission source。In FCC feedstock, nitrogen content is typically in 0.05%～0.35%, and in raw material nitrogen, about 45% enters fluid product, and about 10% enters gas products, and all the other enter in coke。Nitrogen in coke there are about 10%～30% and enters flue gas as NO, and all the other are then reduced to N by coke and CO2Discharge。
Current gas denitrifying technology mainly has: the SCR method (selective catalytic reduction) of gas-phase reaction and SNCR method (SNCR method), liquid absorption method, solid absorption method, high energy electron active oxidation method etc.。
SCR method is under catalyst action, utilizes reducing agent NO optionally and in flue gasxReaction, generates the N of nonhazardous effect2And H2The technology of O, its reducing agent can be ammonia, ammonia or carbamide, also can be selected for CO or H2, also can be selected for little molecule alkane。SCR technology, compared with other technologies, has denitration efficiency height, the advantages such as thermal discharge is little, technology maturation, is apply maximum technology in current Flue Gas Denitrification Engineering both at home and abroad。
SNCR method is under the effect not having catalyst, sprays into reducing agent (generally using ammonia, ammonia or carbamide) in the burner hearths of 900～1100 DEG C, and the rapid pyrolysis of reducing agent is NH3, with the NO in flue gasxReaction generates N2And H2O, has certain O in burner hearth2Existing, the reducing agent sprayed into is selective and NOxReaction, substantially not with O2Reaction。If FCC apparatus is equipped with CO boiler, SNCR can directly apply。The upstream that ammonia is expelled to CO boiler makes NH3With NOxReact in CO boiler。NO in this methodxElimination scope is limited in 40～60%。It is worth noting, if the SO in FCC tail gasxContaining causing that ammonium sulfate precipitation is in CO boiler by height。
CN201524525U describes a kind of SCR equipment for denitrifying flue gas, it includes catalytic reactor, ammonia/air mixer, ammonia injection barrier, air preheater, wherein one end of catalytic reactor is connect by economizer and boiler tube, the other end is connect by air preheater and dedusting organ pipe, one entrance of described ammonia/air mixer and dilution air pipe connect, and another entry sequence pipe of described ammonia/air mixer is connected to ammonia dashpot, ammonia evaporator, liquefied ammonia storage tank。This structure is disadvantageous in that, inside reactor smoke distribution is uneven, affects denitration efficiency, and produces the escaping of ammonia；Meanwhile, catalytic reactor is placed in boiler exterior, and floor space is big, and equipment investment is high。
CN201454505U describes a kind of SCR denitration reactor, and the flue gas after dedusting, desulfurization is sufficiently mixed with ammonia at gas approach place, then enters in Benitration reactor shell via reactor inlet, and mixing gas is by beds, NOxWith NH3React under catalyst action, reach the purpose of denitration。This structure is disadvantageous in that, flue gas is just directly entered reactor without buffering, causes that in reactor, smoke distribution is uneven, affects denitration efficiency, and produce the escaping of ammonia。
Summary of the invention
The present invention is directed to denitrating flue gas efficiency in prior art low, flue gas and ammonia mix uneven and denitration device occupation of land is big, invest high problem, provide a kind of CO boiler with denitration function, flue gas and ammonia mixing homogeneity can be effectively improved, improve denitration efficiency and prevent the escaping of ammonia, and saving equipment investment。
The invention provides a kind of CO boiler with denitration function, described boiler includes flue, combustor, steam drum, evaporator section and economizer section, described flue includes the first vertical flue, horizontal flue and the second vertical flue, the two ends of described horizontal flue connect with the top of the first vertical flue and the second vertical flue respectively, combustor is arranged in the first vertical flue, steam drum is arranged in horizontal flue, evaporator section and economizer section are arranged in the second vertical flue, it is characterized in that: described in there is the CO boiler of denitration function also include spray ammonia mixed organization and Benitration reactor, described spray ammonia mixed organization is arranged in the second vertical flue, it is positioned at the top of evaporator section, described Benitration reactor is arranged between evaporator section and economizer section。
In CO boiler of the present invention, described Benitration reactor is from top to bottom disposed with hanging beam, steam sootblower, catalyst module and catalyst support beam。
In CO boiler of the present invention, described evaporator section is the pipe heat exchanger of multiple row tube bank interlaced arrangement, and it is highly generally 3～5 meters, is provided with some parallel heat exchanger tubes in each column tube bank, adopting end to end serpentine configuration to arrange between adjacent heat exchange tubes, heat exchanger tube is finned pipe。
In CO boiler of the present invention, described spray ammonia mixed organization can adopt structure well known to those skilled in the art, for instance can adopt ammonia-spraying grid。In the present invention, in order to increase the mixed effect of flue gas and ammonia further, it is recommended that adopt the spray ammonia mixed organization of following structure。In CO boiler of the present invention, described spray ammonia mixed organization includes spray ammonia house steward, spray ammonia arm and spray ammonia element, and described spray ammonia arm arranges some, and one end of spray ammonia arm is connected with spray ammonia house steward, and the other end is enclosed construction；Described spray ammonia element includes nozzle, anemostat and spatter plate, and the lower surface of spray ammonia arm is connected with described spray ammonia element by nozzle。
In CO boiler of the present invention, described spray ammonia element includes nozzle, anemostat and spatters plate, and described anemostat includes contraction section, trunnion and expansion segment from top to bottom successively, and the outlet of nozzle lower end is stretched in anemostat contraction section, described in spatter plate and be arranged at the lower section of expansion segment。
In CO boiler of the present invention, the outlet of described nozzle lower end adopts undergauge structure。The angle of throat of described anemostat contraction section is generally 10 °～60 °, it is preferable that 15 °～30 °。The length of described trunnion is generally 1～4 times of throat pipe diameter, it is preferable that 1～3 times。The angle of flare of described expansion segment is for being generally 7 °～30 °, it is preferable that 10 °～20 °。
In CO boiler of the present invention, described in spatter plate and be at least two-layer, plate is provided with sieve aperture, described in spatter packing free ratio be 10%～60%, it is preferable that 30%～50%。Described plate shape of spattering can be circular or polygon, it is preferable that consistent with outlet, anemostat lower end shape。Described sieve aperture shape can be circular or polygon, it is preferable that circular, described in spatter the aperture of sieve aperture on plate and be generally 3～8mm, it is preferable that aperture 4～6mm, it is possible to adopt equilateral triangle arrangement or square arrangement, adjacent to spatter sieve aperture between plate staggered。Described nozzle, anemostat and spatter the dead in line of plate, the distance spattering plate and expansion segment water outlet plane section is generally the 30%～150% of length of throat, it is preferable that 80%～120%。
Compared with prior art, the CO boiler with denitration function of the present invention has the advantage that
1, the CO boiler with denitration function of the present invention, it is integrated in a boiler by CO boiler of the prior art and FCC flue gas denitration reactor to realize the function of the two, but the two is not adding and relation in simple meaning, but has certain facilitation to each other。In the present invention, Benitration reactor and CO boiler are arranged to integral structure, by the temperature field that CO boiler combustion and heat-obtaining are formed, Benitration reactor is set at the suitable SCR temperature spot reacted and carries out SCR reaction, owing to SCR reacts also not heat release of neither absorbing heat, can when not affecting recycling CO residual heat from boiler fume, better utilize fume afterheat, improve heating efficiency, and Benitration reactor is arranged in CO boiler, also a saving plant area space, reduce investment。
2, the CO boiler with denitration function of the present invention, before spray ammonia mixed organization is arranged on evaporator section, the finned tube on evaporator section heat exchanger is utilized to form turbulent element on the one hand, strengthen ammonia and flue gas mixed effect, described evaporator section generally comprises at least two group heat exchangers on the other hand, it has the height of about 8 meters along the second flue, provides bigger blending space for flue gas and ammonia, solves original denitrification apparatus ammonia and flue gas mixes apart from short problem。The CO boiler with denitration function of the present invention can be effectively improved flue gas and ammonia mixing homogeneity, improves denitration efficiency and prevents the escaping of ammonia, and without arranging mixed ammonia grid, simplifies device structure, saves equipment investment。
3, the CO boiler with denitration function of the present invention, Benitration reactor forms integral structure with CO boiler, Benitration reactor inside smoke can be made to be evenly distributed, fluid stable, and ensure that flue gas flows vertically through catalyst duct, prevent from catalyst is caused damage, reduce system pressure drop, improve denitration efficiency and prevent the escaping of ammonia。Simultaneously can also provide stable laminar flow state for economizer section, it is ensured that the thermal efficiency of evaporator section and economizer。
4, the CO boiler with denitration function of the present invention, adopt efficiently spray ammonia mixed organization, the wherein said plate that spatters is three layers, ground floor spatters plate sectional area more than expansion segment lower end discharge area, mixing gas is made to form solid-cone range of distribution after spattering plate, and produce bigger dispersion territory, increase mixing gas be not inhaled into anemostat flue gas remix probability, flue gas and ammonia is made to be more fully mixed, ensure that within the scope of whole reactor cross section, ammonia is uniformly distributed, give full play to catalyst performance, improve denitration efficiency and prevent the escaping of ammonia, reduce the space that mixing is required, reduce investment outlay。Described injection gas service pipe is parallel in flue, and nozzle, along the intensive layout in flue cross section, makes each anemostat suction areas overlap, it is ensured that being uniformly distributed of gas。
Accompanying drawing explanation
Fig. 1 is the CO boiler structure schematic diagram with denitration function of the present invention。
Fig. 2 is spray ammonia mixed organization front view of the present invention。
Fig. 3 is spray ammonia element front view of the present invention。
Detailed description of the invention
Below in conjunction with accompanying drawing, the CO boiler with denitration function of the present invention is described further。
Embodiment 1
As shown in Figure 1, the invention provides a kind of CO boiler with denitration function, described boiler includes flue 1, combustor 2, steam drum 3, evaporator section 5 and economizer section 7, described flue includes the first vertical flue 8, horizontal flue 9 and the second vertical flue 10, described horizontal flue 9 two ends connect with the top of the first vertical flue 8 and the second vertical flue 10 respectively, combustor 2 is arranged in the first vertical flue 8, steam drum 3 is arranged in horizontal flue 9, evaporator section 5 and economizer section 7 are arranged in the second vertical flue 10, wherein, described boiler also includes spray ammonia mixed organization 4 and Benitration reactor 6, described spray ammonia mixed organization 4 is arranged in the second vertical flue 10, it is positioned at above evaporator section 5, Benitration reactor 6 is between evaporator section 5 and economizer section 7。Benitration reactor 6 includes hanging beam 11, steam sootblower 12, catalyst module 13 and catalyst support beam 14。
The CO boiler with denitration function provided by the invention in use, first passes through the hanging beam 11 arranged in Benitration reactor 6, is hung in Benitration reactor 6 by catalyst module 13, be placed on catalyst support beam 14, complete the installation of catalyst module 13。First flue gas fully burns in combustor 2, removes the CO in flue gas, and the steam drum 3 again through CO boiler 1 carries out heat-obtaining；Flue gas after steam drum heat-obtaining mixes with the ammonia sprayed into by spraying ammonia mixed organization 4, in evaporator section, the finned tube on heat exchanger forms turbulent element, strengthen ammonia and flue gas mixed effect, described evaporator section has the height of about 8 meters along the second flue on the other hand, bigger blending space is provided for flue gas and ammonia, mixed flue-gas temperature, at about 350 DEG C, enters Benitration reactor 6 and carries out reduction reaction removing NOx；Flue gas after denitration processes enters economizer section 7 and continues heat-obtaining, after completing net quantity of heat removal process, and can discharging directly into atmosphere or entrance desulfurizer。When in flue gas, dust content increases, during blocking catalyst duct, start steam sootblower 12 and carry out soot blowing。
Embodiment 2
In boiler of the present invention, described spray ammonia mixed organization 4 includes spray ammonia house steward 15, spray ammonia arm 16 and spray ammonia element 17, and described spray ammonia arm 16 arranges some, and one end of spray ammonia arm 16 is connected with spray ammonia house steward 15, and the other end is enclosed construction；Described spray ammonia element 17 includes nozzle 18, anemostat 19 and spatter plate 20, and the lower surface of spray ammonia arm 16 is connected with described spray ammonia element 17 by nozzle 18。Described anemostat 19 includes contraction section 21, trunnion 22 and expansion segment 23 from top to bottom successively, and the outlet of nozzle 18 lower end is stretched in anemostat contraction section 21, described in spatter plate 20 and be arranged at the lower section of expansion segment 23。Wherein, contraction section angle of throat is 15 °～30 °, the expansion segment angle of flare 10 °～20 °, and length of throat is 1～3 times of throat pipe diameter, spatters distance is length of throat the 80%～120% of plate and expansion segment water outlet plane section；The described plate 4 that spatters is for three layers, and plate is provided with sieve aperture, ground floor spatters the plate sectional area lower end discharge area more than expansion segment 7, all the other two-layers are spattered plate sectional area and are gradually reduced, the described packing free ratio that spatters is 30%～50%, spattering the aperture of sieve aperture on plate is 4～6mm, adopts equilateral triangle arrangement or square arrangement, and adjacent to spatter sieve aperture between plate staggered。
Spray ammonia mixed organization 2 of the present invention is in use, ammonia enters spray ammonia arm 16 through spray ammonia house steward 15, anemostat contraction section 21 is sprayed into by spraying the nozzle 18 on ammonia arm 10, and accelerate in contraction section 21, forming negative pressuren zone, produce swabbing action and suck contraction section 21 entrance major part flue gas, mixing gas enters anemostat expansion segment 23 through trunnion 22, and slow down in expansion segment 23, it is achieved the first stage mixing of two kinds of gases；Mixing gas is spattering the generation splash of plate 20 place, utilization is spattered plate 20 and simulation model for mixing gases flows is formed obstruction, mixing gas is made to form solid-cone range of distribution after spattering plate 20, increase mixing gas be not inhaled into anemostat 19 flue gas remix probability, and produce bigger dispersion territory, realize mixing gas to mix with the second stage not being inhaled into anemostat 19 flue gas, reach good mixed effect。
Claims (9)
1. a CO boiler with denitration function, described boiler includes flue, combustor, steam drum, evaporator section and economizer section, described flue includes the first vertical flue, horizontal flue and the second vertical flue, the two ends of described horizontal flue connect with the top of the first vertical flue and the second vertical flue respectively, combustor is arranged in the first vertical flue, steam drum is arranged in horizontal flue, evaporator section and economizer section are arranged in the second vertical flue, it is characterized in that: described in there is the CO boiler of denitration function also include spray ammonia mixed organization and Benitration reactor, described spray ammonia mixed organization is arranged in the second vertical flue, it is positioned at the top of evaporator section, described Benitration reactor is arranged between evaporator section and economizer section, described spray ammonia mixed organization includes spray ammonia house steward, spray ammonia arm and spray ammonia element；Described spray ammonia arm arranges some, and one end of spray ammonia arm is connected with spray ammonia house steward, and the other end is enclosed construction；Described spray ammonia element includes nozzle, anemostat and spatter plate, and the lower surface of spray ammonia arm is connected with described spray ammonia element by nozzle。
2. the CO boiler described in claim 1, it is characterised in that: described Benitration reactor is from top to bottom disposed with hanging beam, steam sootblower, catalyst module and catalyst support beam。
3. the CO boiler described in claim 1, it is characterised in that: described anemostat includes contraction section, trunnion and expansion segment from top to bottom successively, and the outlet of nozzle lower end is stretched in anemostat contraction section, described in spatter plate and be arranged at the lower section of expansion segment。
4. the CO boiler described in claim 3, it is characterised in that: the angle of throat of described contraction section is 10 °～60 °, and length of throat is 1～4 times of throat pipe diameter, and the expansion segment angle of flare is 7 °～30 °。
5. the CO boiler described in claim 1, it is characterised in that: described nozzle, anemostat and spatter the dead in line of plate。
6. the CO boiler described in claim 1, it is characterised in that: described in spatter plate and be at least two-layer, spatter plate and be provided with sieve aperture, spattering packing free ratio is 10%～60%。
7. the CO boiler described in claim 1, it is characterised in that: described in spatter plate shape for circular or polygon。
8. the CO boiler described in claim 6, it is characterised in that: described sieve aperture is generally circular in shape or polygon, adopts equilateral triangle arrangement or square arrangement, and adjacent to spatter sieve aperture between plate staggered。
9. the CO boiler described in claim 3, it is characterised in that: described in spatter distance is length of throat the 30%～150% of plate and expansion segment water outlet plane section。
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| CN201210408291.9A CN103776043B (en) | 2012-10-24 | 2012-10-24 | A kind of CO boiler with denitration function |
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| CN201210408291.9A CN103776043B (en) | 2012-10-24 | 2012-10-24 | A kind of CO boiler with denitration function |
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| CN103776043A CN103776043A (en) | 2014-05-07 |
| CN103776043B true CN103776043B (en) | 2016-06-22 |
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| WO2019052797A1 (en) * | 2017-09-15 | 2019-03-21 | Haldor Topsøe A/S | A process for performing selective catalytic reduction of coke oven flue gas |
| CN108072046A (en) * | 2018-01-23 | 2018-05-25 | 上海云汇环保科技有限公司 | A kind of CO stoves combustion product gases processing system |
| CN112870973B (en) * | 2021-02-02 | 2024-07-23 | 中国启源工程设计研究院有限公司 | Integrated flow equalizing and mixing device for SCR denitration |
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| CN201394414Y (en) * | 2009-05-09 | 2010-02-03 | 江苏中科节能环保技术有限公司 | Injection ammonia-spray mixing mechanism of SCR reaction device |
| CN201969479U (en) * | 2010-05-21 | 2011-09-14 | 中国神华能源股份有限公司 | Flue gas denitration equipment |
| CN102512954A (en) * | 2011-12-23 | 2012-06-27 | 东方电气集团东方锅炉股份有限公司 | Heat recovery steam generator flue gas denitration apparatus |
| CN102537980A (en) * | 2012-01-16 | 2012-07-04 | 哈尔滨工业大学 | High-temperature melting treatment system and method for sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8114272B2 (en) * | 2008-09-26 | 2012-02-14 | Exxonmobil Research & Engineering Company | Method for treating refinery waste streams in a fluid catalytic cracking unit and an improved catalytic cracking unit for processing refinery waste streams |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201394414Y (en) * | 2009-05-09 | 2010-02-03 | 江苏中科节能环保技术有限公司 | Injection ammonia-spray mixing mechanism of SCR reaction device |
| CN201969479U (en) * | 2010-05-21 | 2011-09-14 | 中国神华能源股份有限公司 | Flue gas denitration equipment |
| CN102512954A (en) * | 2011-12-23 | 2012-06-27 | 东方电气集团东方锅炉股份有限公司 | Heat recovery steam generator flue gas denitration apparatus |
| CN102537980A (en) * | 2012-01-16 | 2012-07-04 | 哈尔滨工业大学 | High-temperature melting treatment system and method for sludge |
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