CN103776043A - CO boiler having denitration function - Google Patents
CO boiler having denitration function Download PDFInfo
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- CN103776043A CN103776043A CN201210408291.9A CN201210408291A CN103776043A CN 103776043 A CN103776043 A CN 103776043A CN 201210408291 A CN201210408291 A CN 201210408291A CN 103776043 A CN103776043 A CN 103776043A
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Abstract
The invention relates to a CO boiler having the denitration function. The CO boiler comprises a flue, a combustion chamber, steam drums, an evaporation section and an economizer section. The flue comprise a first vertical flue body, a horizontal flue body and a second vertical flue body, wherein the two ends of the horizontal flue body are communicated with the upper portion of the first vertical flue body and the upper portion of the second vertical flue body respectively, the combustion chamber is arranged in the first vertical flue body, the steam drums are arranged in the horizontal flue body, and the evaporation section and the economizer section are arranged in the second vertical flue body. The CO boiler further comprises an ammonia spraying and mixing mechanism and a denitration reactor. The ammonia spraying and mixing mechanism is arranged in the second vertical flue body and is located above the evaporation section. The denitration reactor is arranged between the evaporation section and the economizer section. The CO boiler having the denitration function can effectively improve the mixing uniformity of smoke and ammonia gas, improve the denitration efficiency and prevent ammonia escape; due to the fact that the denitration reactor is arranged in the CO boiler, an ammonia mixing grid is not needed, the utilization efficiency of smoke heat is improved, and the occupied space of the CO boiler and equipment investment are reduced.
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 oxide (NO
x) be one of primary pollution source of atmosphere pollution, what in occupational environment, contact is that several admixture of gas are often called the smoke of gunpowder (gas), is mainly NO and NO
2, with NO
2be main.NO
xall there is toxicity in various degree, with NO and NO
2be main NO
xit is a major reason that forms photochemical fog and acid rain.NO in vehicle exhaust
xirradiate the toxic smog that reacts and form with hydrocarbon through ultraviolet ray, be called photochemical fog.Photochemical fog has special odor, stimulates eyes, injury plant, and can make atmospheric visibility reduce.In addition, NO
xreacting the nitric acid and the nitrous acid that generate with airborne water is the composition of acid rain.NO
xthe harm of human body is mainly manifested in to infringement respiratory tract.
The whole world enters the NO of atmosphere every year
xtotal amount approximately reaches 5,000 ten thousand tons, and 2008, China NO
xdischarge capacity has reached 2,000 ten thousand tons, becomes the large discharge of the first in the world state.Control if do not take measures, expect the year two thousand twenty, NO
xdischarge capacity will reach 3,000 ten thousand tons, and China the Eleventh Five-Year Plan period cuts down the effort of sulfur dioxide 10%, also will be because of NO
xthe remarkable rising of discharge capacity and all offset.At present, China is by NO
xinclude overall control category during " 12 " in as the binding indicator.Be discharged into the NO in atmosphere
xmainly contain three sources: power plant's (accounting for 46%), vehicle exhaust (accounting for 49%) and oil-refining chemical factory (accounting for 5%).
In FCC technique, catalyst granules is repeatedly cycling between catalytic cracking reaction zone and catalyst regeneration zones, and at regeneration period, the coke from cracking reaction on catalyst granules is at high temperature removed by air oxidation, make the activity recovery of catalyst, and again utilize in cracking reaction.NO in FCC flue gas
xmainly, from the burning of nitrogenous coke on catalyst, all can there is NO in the FCC apparatus of all processing nitrogen-containing materials therefore
xemission problem.NO in FCC flue gas
xmeasure the general Zhan Quan NO of factory
x50% of discharge capacity is the NO of oil plant maximum
xemission source.In FCC raw material, nitrogen content is generally 0.05%～0.35%, and in raw material nitrogen, approximately 45% enters fluid product, and approximately 10% enters gas products, and all the other enter in coke.Nitrogen in coke approximately has 10%～30% to enter flue gas as NO, and all the other are reduced to N by coke and CO
2discharge.
Gas denitrifying technology mainly contains at present: 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, utilize reducing agent optionally with flue gas in NO
xreaction, the N of generation nonhazardous effect
2and H
2the technology of O, its reducing agent can be ammonia, ammoniacal liquor or urea, also can select CO or H
2, also can select little molecule alkane.The advantages such as SCR technology, compared with other technologies, has denitration efficiency high, and thermal discharge is little, technology maturation are in Flue Gas Denitrification Engineering, to apply maximum technology both at home and abroad at present.
SNCR method is under the effect that there is no catalyst, in the burner hearth of 900～1100 ℃, sprays into reducing agent (generally using ammonia, ammoniacal liquor or urea), and the rapid pyrolysis of reducing agent is NH
3, with the NO in flue gas
xreaction generates N
2and H
2o, has certain O in burner hearth
2exist, the reducing agent spraying into optionally with NO
xreaction, substantially not with O
2reaction.If FCC apparatus has been equipped with CO boiler, SNCR can directly apply.The upstream that ammonia is expelled to CO boiler makes NH
3with NO
xin CO boiler, react.NO in this method
xthe scope of removing is limited in 40～60%.It is worth noting, if the SO in FCC tail gas
xcontaining can causing ammonium sulfate to be deposited in CO boiler by height.
CN201524525U has introduced a kind of SCR equipment for denitrifying flue gas, it comprises that catalytic reactor, ammonia/air mixer, ammonia spray barrier, air preheater, wherein one end of catalytic reactor connects by economizer and boiler tube, the other end connects by air preheater and dedusting organ pipe, one entrance and the dilution air pipe of described ammonia/air mixer connect, and another entry sequence pipe of described ammonia/air mixer is connected to ammonia dashpot, ammonia evaporator, liquefied ammonia storage tank.The weak point of this structure is, inside reactor smoke distribution is inhomogeneous, affects denitration efficiency, and produces the escaping of ammonia; Meanwhile, catalytic reactor is placed in boiler outside, and floor space is large, and equipment investment is high.
CN201454505U has introduced a kind of SCR Benitration reactor, and the flue gas after dedusting, desulfurization fully mixes with ammonia at gas approach place, then enters in Benitration reactor shell via reactor inlet, and mist is by beds, NO
xwith NH
3under catalyst action, react, reach the object of denitration.The weak point of this structure is, flue gas just directly enters reactor without buffering, causes in reactor smoke distribution inhomogeneous, affects denitration efficiency, and produces the escaping of ammonia.
Summary of the invention
The present invention is directed in prior art denitrating flue gas efficiency low, flue gas and ammonia mix inhomogeneous and denitration device occupation of land is large, invest high problem, a kind of CO boiler with denitration function is provided, can effectively improve flue gas and ammonia mixture homogeneity, 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 comprises flue, combustion chamber, steam drum, evaporator section and economizer section, described flue comprises the first vertical flue, horizontal flue and the second vertical flue, the two ends of described horizontal flue are communicated with the top of the first vertical flue and the second vertical flue respectively, combustion chamber 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 denitration function CO boiler also comprise spray ammonia mixed organization and Benitration reactor, described spray ammonia mixed organization is arranged in the second vertical flue, be 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 disposed with hanging beam, steam sootblower, catalyst module and catalyst brace summer from top to bottom.
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 every tubulation bundle, between adjacent heat exchange tubes, adopt end to end serpentine configuration to arrange, 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 example, can adopt ammonia-spraying grid.In the present invention, in order further to increase the mixed effect of flue gas and ammonia, the spray ammonia mixed organization of the following structure of recommend adoption.In CO boiler of the present invention, described spray ammonia mixed organization comprises 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 comprises 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 comprises nozzle, anemostat and spatters plate, described anemostat comprises contraction section, trunnion and expansion segment from top to bottom successively, and nozzle lower end outlet is stretched in anemostat contraction section, described in spatter plate and be arranged at the below 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 °, preferably 15 °～30 °.The length of described trunnion is generally 1～4 times of throat pipe diameter, preferably 1～3 times.The angle of flare of described expansion segment is for being generally 7 °～30 °, preferably 10 °～20 °.
In CO boiler of the present invention, described in spatter plate and be at least two-layerly, plate is provided with sieve aperture, described in to spatter plate percent opening be 10%～60%, preferably 30%～50%.The described plate shape of spattering can be circle or polygon, preferably consistent with outlet, anemostat lower end shape.Described sieve aperture shape can be circle or polygon, circular, described in spatter the aperture of sieve aperture on plate and be generally 3～8mm, preferably aperture 4～6mm, can adopt equilateral triangle to arrange or square is arranged, the adjacent sieve aperture that spatters between plate is staggered.Described nozzle, anemostat and the dead in line of spattering plate, the distance of spattering plate and expansion segment outlet horizontal cross-section is generally 30%～150% of length of throat, and preferably 80%～120%.
Compared with prior art, the CO boiler tool with denitration function of the present invention has the following advantages:
1, the CO boiler with denitration function of the present invention, CO boiler of the prior art and FCC flue gas denitration reactor are integrated into the function that realizes the two in a boiler, but the two is not adding and relation in simple meaning, but there is to each other certain facilitation.In the present invention, Benitration reactor and CO boiler are arranged to integral structure, the temperature field forming by CO boiler combustion and heat-obtaining, arranges Benitration reactor at the temperature spot of suitable SCR reaction and carries out SCR reaction, due to neither also not heat release of heat absorption of SCR reaction, can be in the situation that not affecting recycling CO residual heat from boiler fume, better utilize fume afterheat, improved heating efficiency, and Benitration reactor is arranged in CO boiler, also save plant area space, reduced investment.
2, the CO boiler with denitration function of the present invention, before spray ammonia mixed organization is arranged on to evaporator section, utilize on the one hand the finned tube on evaporator section heat exchanger to form turbulent element, 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 8 meters of left and right along the second flue, for flue gas and ammonia provide larger blending space, solved original denitrification apparatus ammonia and flue gas and mixed the short problem of distance.The CO boiler with denitration function of the present invention can effectively improve flue gas and ammonia mixture homogeneity, improves denitration efficiency and prevents the escaping of ammonia, and without mixed ammonia grid is set, having simplified device structure, saves equipment investment.
3, the CO boiler with denitration function of the present invention, Benitration reactor and CO boiler form integral structure, can make the inner smoke distribution of Benitration reactor even, fluid stable, and guarantee that flue gas vertical current crosses catalyst duct, prevent catalyst to cause damage, reduce system pressure drop, improve denitration efficiency and prevent the escaping of ammonia.Can also, for economizer section provides stable laminar flow state, guarantee the thermal efficiency of evaporator section and economizer simultaneously.
4, the CO boiler with denitration function of the present invention, adopt efficient spray ammonia mixed organization, the wherein said plate that spatters is three layers, ground floor spatters plate sectional area and is greater than expansion segment lower end discharge area, make mist after spattering plate, form solid-cone range of distribution, and the larger dispersion territory of generation, increase mist be not inhaled into anemostat flue gas mix again probability, flue gas is mixed more abundant with ammonia, guarantee 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 and mix needed space, reduce investment outlay.Described gas jet arm is parallel in flue, and nozzle, along the intensive layout in flue cross section, overlaps each anemostat suction areas, guarantees 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.
The specific embodiment
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 comprises flue 1, combustion chamber 2, steam drum 3, evaporator section 5 and economizer section 7, described flue comprises the first vertical flue 8, horizontal flue 9 and the second vertical flue 10, described horizontal flue 9 two ends are communicated with the top of the first vertical flue 8 and the second vertical flue 10 respectively, combustion chamber 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 comprises spray ammonia mixed organization 4 and Benitration reactor 6, described spray ammonia mixed organization 4 is arranged in the second vertical flue 10, be positioned at evaporator section 5 tops, Benitration reactor 6 is between evaporator section 5 and economizer section 7.Benitration reactor 6 comprises hanging beam 11, steam sootblower 12, catalyst module 13 and catalyst brace summer 14.
The CO boiler with denitration function provided by the invention in use, first, by the hanging beam 11 of Benitration reactor 6 interior settings, hangs in catalyst module 13 in Benitration reactor 6, is placed on catalyst brace summer 14, completes the installation of catalyst module 13.First fully burning in combustion chamber 2 of flue gas, removes the CO in flue gas, then carries out heat-obtaining by the steam drum 3 of CO boiler 1; Flue gas after steam drum heat-obtaining mixes with the ammonia spraying into by spray ammonia mixed organization 4, form turbulent element through the finned tube on heat exchanger in evaporator section, strengthen ammonia and flue gas mixed effect, described evaporator section has the height of 8 meters of left and right along the second flue on the other hand, for flue gas and ammonia provide larger blending space, mixed flue-gas temperature is 350 ℃ of left and right, enters Benitration reactor 6 and carries out reduction reaction and remove NO
x; Enter economizer section 7 through denitration flue gas after treatment and continue heat-obtaining, complete after net quantity of heat removal process, can discharging directly into atmosphere or enter desulfurizer.When dust content in flue gas increases,, start steam sootblower 12 and blow ash when in blocking catalyst the duct.
Embodiment 2
In boiler of the present invention, described spray ammonia mixed organization 4 comprises 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 comprises 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 comprises contraction section 21, trunnion 22 and expansion segment 23 from top to bottom successively, and nozzle 18 lower ends outlets are stretched in anemostat contraction section 21, described in spatter plate 20 and be arranged at the below of expansion segment 23.Wherein, contraction section angle of throat is 15 °～30 °, 10 °～20 ° of the expansion segment angles of flare, length of throat is throat pipe diameter 1～3 times, the distance of spattering plate and expansion segment outlet horizontal cross-section is length of throat 80%～120%; The described plate 4 that spatters is three layers, and plate is provided with sieve aperture, ground floor spatters the lower end discharge area that plate sectional area is greater than expansion segment 7, all the other two-layer plate sectional areas that spatter dwindle gradually, the described plate percent opening that spatters is 30%～50%, the aperture of spattering sieve aperture on plate is 4～6mm, adopts equilateral triangle to arrange or square is arranged, and the adjacent sieve aperture that spatters between plate is staggered.
Spray ammonia mixed organization 2 of the present invention in use, ammonia enters spray ammonia arm 16 through spray ammonia house steward 15, spray into anemostat contraction section 21 by the nozzle 18 on spray ammonia arm 10, and in the interior acceleration of contraction section 21, form negative pressuren zone, produce swabbing action and suck near the most of flue gas of contraction section 21 entrances, mist enters anemostat expansion segment 23 through trunnion 22, and slow down in expansion segment 23, realize the first stage of two kinds of gases and mix; Mist is spattering plate 20 places generation splash, utilization is spattered plate 20 simulation model for mixing gases flows is formed and hindered, make mist after spattering plate 20, form solid-cone range of distribution, increase mist be not inhaled into anemostat 19 flue gas mix again probability, and the larger dispersion territory of generation, realize mist and mix with the second stage that is not inhaled into anemostat 19 flue gases, reach good mixed effect.
Claims (10)
1. one kind has the CO boiler of denitration function, described boiler comprises flue, combustion chamber, steam drum, evaporator section and economizer section, described flue comprises the first vertical flue, horizontal flue and the second vertical flue, the two ends of described horizontal flue are communicated with the top of the first vertical flue and the second vertical flue respectively, combustion chamber 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 denitration function CO boiler also comprise spray ammonia mixed organization and Benitration reactor, described spray ammonia mixed organization is arranged in the second vertical flue, be positioned at the top of evaporator section, described Benitration reactor is arranged between evaporator section and economizer section.
2. according to CO boiler claimed in claim 1, it is characterized in that: described Benitration reactor is disposed with hanging beam, steam sootblower, catalyst module and catalyst brace summer from top to bottom.
3. according to CO boiler claimed in claim 1, it is characterized in that: described spray ammonia mixed organization comprises 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 comprises nozzle, anemostat and spatter plate, and the lower surface of spray ammonia arm is connected with described spray ammonia element by nozzle.
4. according to CO boiler claimed in claim 3, it is characterized in that: described anemostat comprises contraction section, trunnion and expansion segment from top to bottom successively, nozzle lower end outlet is stretched in anemostat contraction section, described in spatter plate and be arranged at the below of expansion segment.
5. according to CO boiler claimed in claim 4, it is characterized in that: the angle of throat of described contraction section is 10 °～60 °, length of throat is throat pipe diameter 1～4 times, the expansion segment angle of flare is 7 °～30 °.
6. according to CO boiler claimed in claim 3, it is characterized in that: described nozzle, anemostat and the dead in line of spattering plate.
7. according to CO boiler claimed in claim 3, it is characterized in that: described in spatter plate and be at least two-layerly, spatter plate and be provided with sieve aperture, spattering plate percent opening is 10%～60%.
8. according to CO boiler claimed in claim 3, it is characterized in that: described in spatter plate and be shaped as circular polygon.
9. according to CO boiler claimed in claim 3, it is characterized in that: described sieve aperture is shaped as circle or polygon, adopt equilateral triangle to arrange or square is arranged, the adjacent sieve aperture that spatters between plate is staggered.
10. according to CO boiler claimed in claim 3, it is characterized in that: described in to spatter the distance of plate and expansion segment outlet horizontal cross-section be length of throat 30%～150%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210408291.9A CN103776043B (en) | 2012-10-24 | 2012-10-24 | A kind of CO boiler with denitration function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210408291.9A CN103776043B (en) | 2012-10-24 | 2012-10-24 | A kind of CO boiler with denitration function |
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| CN103776043A true CN103776043A (en) | 2014-05-07 |
| CN103776043B CN103776043B (en) | 2016-06-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111093808A (en) * | 2017-09-15 | 2020-05-01 | 托普索公司 | Method for carrying out selective catalytic reduction of coke oven flue gas |
| CN112870973A (en) * | 2021-02-02 | 2021-06-01 | 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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| CN111093808A (en) * | 2017-09-15 | 2020-05-01 | 托普索公司 | Method for carrying out 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 |
| CN112870973A (en) * | 2021-02-02 | 2021-06-01 | 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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