CN103041686A - NOx removing device and method by means of exhaust gas recycle and ammonia agent spray - Google Patents

NOx removing device and method by means of exhaust gas recycle and ammonia agent spray Download PDF

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Publication number
CN103041686A
CN103041686A CN2012105867057A CN201210586705A CN103041686A CN 103041686 A CN103041686 A CN 103041686A CN 2012105867057 A CN2012105867057 A CN 2012105867057A CN 201210586705 A CN201210586705 A CN 201210586705A CN 103041686 A CN103041686 A CN 103041686A
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secondary air
flue gas
nox
air channel
burner hearth
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CN2012105867057A
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孙建飞
罗经华
吴祖良
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Zhejiang Tianjie Environmental Technology Co Ltd
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Zhejiang Tianjie Environmental Technology Co Ltd
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Abstract

The invention relates to a NOx removing device and a NOx removing method by means of exhaust gas recycle and ammonia agent spray, and aims to provide a NOx removing device and a NOx removing device method by means of exhaust gas recycle and ammonia agent spray. according to the method, through modifying the mounting position of an atomizing spray gun, the penetration capacity of a reducer is improved, the reducer and the flue gas are enabled to mix in a good manner, and finally the objective of increasing selective non-catalytic reduction (SNCR) denitration efficiency is achieved. The technical scheme is that the NOx removing device by means of exhaust gas recycle and ammonia agent spray comprises a furnace chamber, a group of secondary air pipes on a side wall of the furnace chamber, and a primary air pipe at the bottom of the furnace chamber. The technical scheme is characterized in that reducer atomizing spray guns are mounted at the secondary air spouts of the secondary air pipes. The device and the method are suitable for the technical field of environment protection and can be applied for boiler denitration.

Description

A kind of flue gas recirculation and ammonia agent are sprayed NOx and are removed device and method
Technical field
The present invention relates to the method that a kind of NOx removes device and reduces NOx discharge capacity in the flue gas; particularly a kind of flue gas recirculation and reducing agent of utilizing sprays the apparatus and method that reduce NOx discharging in the CFBB flue gas; mainly be applicable to environmental protection technical field, can be applicable to Denitration in Boiler.
Background technology
Flue gas recirculation is one of technology that reduces at present the NOx discharging.It is to extract a part of low-temperature flue gas before the air preheater of boiler, or directly sends into burner hearth, or with send in the stove after wind, a Secondary Air mix, so not only can reduce ignition temperature, and diluted oxygen concentration, make temperature reduction in burning velocity and the stove, thereby thermal NO x reduces.Flue gas recirculation legal effect and fuel type and flue gas recirculation rate (ratio of the exhaust gas volumn of flue gas recycled amount when not adopting flue gas recirculation) are relevant.The problem that exists is the restriction that is subjected to combustion stability, and general flue gas recycled rate is that 15%~20%, NOx removal efficiency is 20~30%.
Do not adopt under the condition of catalyst NH at spray ammonia in flue gas 3The reaction of reducing NOx can only be carried out in 950~1050 ℃ temperature range, and therefore, this method is called again SNCR denitration method (being called for short SNCR).Because reaction temperature is 950~1050 ℃, so NH 3The spray site position select most important.Temperature is too high, NH 3Easily oxidation generates new NOx; Temperature is too low, NH 3Can't efficiently decompose, reduce denitration effect, and increase the escape of afterbody ammonia.
When ammonia when NOx in the flue gas contacts, following reduction reaction will occur:
4NH 3+4NO+O 2→6H 2O+4N 2
4NH 3+2NO 2+O 2→6H 2O+3N 2
4NH 3+6NO→6H 2O+5N 2
8NH 3+6NO 2→12H 2O+7N 2
Because the required temperature range of above-mentioned reaction is 950~1050 ℃, its position in burner hearth can change when boiler load changes, therefore be everlasting and offer multilayer ammonia jet on the furnace wall, all to sneak into temperature be in 950~1050 ℃ the flue gas so that spray into ammonia in the stove.In order to enlarge 950~1050 ℃ of these temperature ranges, to reach best reaction effect, also have and adopt special additive such as sodium salt, and spray ammonia uses simultaneously.When adopting the SNCR denitration technology, in spray site must be chosen to be at 950~1050 ℃ temperature range, the mixing that the ammonia that sprays into and flue gas are good, also be to guarantee that the denitration reduction reaction is fully carried out, and use minimal ammonia consumption to reach the essential condition that reduces to greatest extent the NOx discharge value.If the ammonia that sprays into fails fully to react in burner hearth, then unreacted ammonia will " leak " back-end surfaces of boiler, and this not only can make the flying dust in the flue gas be deposited on the heating surface easily, and the ammonia in the flue gas is running into SO 3The time, can generate ammonium sulfate.And ammonium sulfate is viscosity, is easy to stop up air preheater, and the danger of corrosion is arranged.Therefore, ammonia and flue gas being mixed fully is the major issue that adopts this method.Mix not goodly, can cause the reaction blind area, denitration effect descends, and the escape of ammonia increases.The NOx removal efficiency that general SNCR can reach is 30%~60%.
SNCR denitration small investment, operating cost is also low, but range of reaction temperature is narrow, and the condition in good mixing and reaction compartment and reaction time be arranged.In the time will reaching higher NOx removal efficiency, may cause NH 3The problems such as leakage rate is excessive.The NOx removal efficiency that general SNCR can reach is 30%~60%, so its use is subject to certain restrictions.
Summary of the invention
The technical problem to be solved in the present invention is: the problem for above-mentioned existence provides a kind of flue gas recirculation and ammonia agent injection NOx to remove device and method, transformation by the atomizing lance installation site, improve the penetration depth of reducing agent, so that reducing agent well mixes with flue gas, finally reach the purpose that improves the SNCR denitration efficiency.
Another technical problem that the present invention will solve is: collaborative flue gas recirculation and SNCR denitration, under the prerequisite that keeps the CFBB fluidizing velocity, cause reducing atmosphere and reduce ignition temperature, reduce NOx and generate, and finally reach the purpose that reduces the NOx discharging.
The technical solution adopted in the present invention is: flue gas recirculation and ammonia agent are sprayed NOx and are removed device, comprise burner hearth, be positioned at one group of secondary air channel on this burner hearth sidewall, and an airduct that is positioned at this burner hearth bottom, it is characterized in that: the overfire air port place of described secondary air channel is equipped with the reducing agent atomizing lance.
The nozzle of described reducing agent atomizing lance is positioned at the inboard of secondary air channel spout.
Described secondary air channel adopts the dipping type arrangement, and the angle of its air-out direction and horizontal plane is the 10-20 degree.
The injection direction of described reducing agent atomizing lance is identical with the air-out direction of secondary air channel spout.
The number of described secondary air channel is 4 multiple, two-layer layout about minute, and the spacing between the two-layer secondary air channel is 1-2m up and down; The air quantity of levels Secondary Air is than being 3:2~2:1.
The quantity of two-layer secondary air channel is identical, and the secondary air channel that is positioned at same layer positioned opposite in twos.
Two-layer secondary air channel interlaced arrangement up and down.
Be connected with on the described airduct for the flue gas recycled pipeline that boiler smoke is delivered to airduct, mixes with wind.
Reduce the method for NOx in the CFBB flue gas, it is characterized in that step is as follows:
A, in wind, mix a certain proportion of, by burner hearth output and the flue gas recycled that contains NOx after dedusting separates, again spray in the burner hearth, with reduce by one time in the wind oxygen concentration and the ignition temperature in the burner hearth, and generate reducing substances, NOx is reduced to N 2
B, spray into Secondary Air in from secondary air channel to burner hearth, spray into reducing agent from the reducing agent atomizing lance simultaneously, utilize flow velocity and the penetration capacity of Secondary Air, with the reducing agent atomizing, and penetrate burner hearth inside, realize the selective non-catalytic denitration.
The proportioning of described flue gas recycled and a wind is 1:1~1:2; The ratio of wind and Secondary Air is 1:1~3:2.
The invention has the beneficial effects as follows: 1, the reducing agent spray gun is arranged in the nozzle of secondary air channel, can reducing agent is fully mixed with flue gas by the momentum of Secondary Air, thereby improve denitration efficiency.2, the nozzle of reducing agent atomizing lance is positioned at the inboard of secondary air channel spout, has avoided ash-laden gas to directly the washing away of spray gun, and has hardly wear problem, thereby has greatly improved the service life of spray gun.3, the Secondary Air temperature is generally below 200 degree, when spraying into Secondary Air, can purge cooling to spray gun, plays a very good protection, and has improved spray gun service life.4, overfire air port adopts the dipping type arrangement, and angle of declination is generally 10 ~ 20 degree, can effectively suppress flowing of fine particle, prolongs its flowing time in burner hearth, is beneficial to the after-flame of tiny carbon granules, reduces the unburnt heat loss of solid.5, the spray gun arrangements of 10~20 degree that have a down dip make reducing agent spraying be " U " type, can prolong reducing agent in the time of staying of SNCR temperature window, and further improve mixed effect.6, secondary air channel is arranged on two relative faces, and the secondary air channel that is positioned at same layer positioned opposite in twos, thereby has greatly increased the penetration depth of Secondary Air in fluid bed, makes boiler combustion more fully stable.7, two-layer secondary air channel interlaced arrangement has up and down better been optimized the distribution of reducing agent.8, the collaborative flue gas recirculation of the present invention and SNCR denitration, utilize the inventive method to process after, denitration efficiency has obtained further raising compared to prior art.
Description of drawings
Fig. 1 is the arrangement schematic diagram (partial cutaway is shown) of secondary air channel on the burner hearth of the present invention.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is the interior reducing agent atomizing lance arrangement figure of secondary air channel among the present invention.
Fig. 4 is NOx removing process flow chart of the present invention.
The specific embodiment
Because high-temperature flue gas viscosity is large, and the reducing agent atomizing lance is less owing to flow, and eject momentum is limited, is difficult to penetrate flue gas, and it is abundant not that the reducing agent after causing atomizing mixes with flue gas, and denitration efficiency is low.Therefore, present embodiment carries out specific aim on the basis of existing technology to be improved, its concrete structure mainly comprises burner hearth 1, is arranged in the effect that one group of secondary air channel 2(on burner hearth 1 sidewall gets up aftercombustion and carries material as shown in Figure 1-Figure 3), and an airduct 5 that is positioned at burner hearth 1 bottom; Wherein the overfire air port place of secondary air channel 2 is equipped with reducing agent atomizing lance 3, and the arrival end of this spray gun connects respectively reducing agent and compressed air.Can utilize the characteristics that the Secondary Air air quantity is large, momentum is high, rigidity is strong in actual the use, the reducing agent atomizing particle is blown at a high speed in the burner hearth 1, greatly improve the penetration depth of reducing agent, thereby improve largely the situation of mixing of reducing agent and flue gas, improve denitration efficiency.
Because the concentration of solid particles in the burner hearth 1 is large, and about about 900 ℃ of burner hearth 1 interior flue-gas temperature, if reducing agent atomizing lance 3 is arranged in burner hearth 1 inside, not only wear problem is very outstanding, and high temperature also has considerable influence to life-span of reducing agent atomizing lance 3.In this example, the nozzle of reducing agent atomizing lance 3 is positioned at the inboard of secondary air channel 2 spouts, avoids on the one hand ash-laden gas to directly the washing away of reducing agent atomizing lance 3, and has hardly wear problem, can greatly improve the service life of spray gun; Can utilize on the other hand Secondary Air (temperature be generally 200 degree following) that the reducing agent atomizing lance 3 that is positioned at spout is purged cooling, therefore play a very good protection, improve spray gun service life.
Described secondary air channel 2 adopts the dipping type arrangement, the angle of its air-out direction and horizontal plane is the 10-20 degree, can effectively suppress flowing of fine particle, prolongs its flowing time in burner hearth 1, be beneficial to the after-flame of tiny carbon granules, reduce the unburnt heat loss of solid.The injection direction of described reducing agent atomizing lance 3 is identical with the air-out direction of secondary air channel 2 spouts, the 10-20 degree that namely has a down dip is equally arranged, make the reducing agent spraying be " U " type, can prolong reducing agent in the time of staying of SNCR temperature window, and further improve the mixed effect of reducing agent and flue gas.
The number of described secondary air channel 2 is 4 integral multiple, is generally 4,8 or 12, in this example, described secondary air channel 2 has four, two-layer layout about minute, every layer arranges two, and the spacing between the two-layer secondary air channel 2 is 1-2m up and down, distribution by air quantity, again form air stage feeding, lower floor is the reducing zone, and the upper strata is burning-out zone, further reduce the generation of NOx, the air quantity of levels Secondary Air is than being 3:2~2:1.In order better to optimize the distribution of reducing agent, two-layer secondary air channel 2 adopts interlaced arrangement up and down; Interlaced arrangement described in this example refers to the line of two secondary air channels 2 in certain one deck, and with the line of two secondary air channels 2 in another layer, the projection on horizontal plane is to intersect arranges that the crosspoint overlaps with the projection of burner hearth 1 vertical axis on horizontal plane.
In order further to increase the penetration depth of Secondary Air in burner hearth 1, make boiler combustion fully stable, two secondary air channels 2 that are positioned at same layer are arranged on 1 two relative faces of burner hearth, and namely the axis of two secondary air channels 2 is in the same plane; It is the boiler of rectangle that this arrangement is fit to fluid bed, no matter the size of boiler capacity all can adopt this kind arrangement.In this example, four secondary air channels 2 lay respectively on four faces of rectangle furnace, and two secondary air channels 2 that are positioned on the opposite face are highly identical, and positioned opposite.
Be connected with a flue gas recycled pipeline 7 on the described airduct 5, this flue gas recycled pipeline one end is communicated with the boiler smoke discharge end, the other end is communicated with an airduct 5, at flue gas recycled pipeline 7 recirculation blower 8 is installed simultaneously, utilize this recirculation blower that boiler smoke is delivered to airduct 5 one time, and send in the burner hearth 1 after a wind mixes; By control recirculation blower 8 and the power that is positioned at the primary air fan 11 of airduct 5 air intakes, the ratio of regulating flue gas recycled and a wind.
Utilize aforementioned NOx to remove device and reduce NOx(nitrogen oxide in the CFBB flue gas) method, its step is as follows:
Under the prerequisite of a, assurance bed material fluidisation and the interior bed temperature of stove, the flue gas recycled (getting burner hearth 1 discharge and the partial fume after separating) that in a wind, mixes a certain proportion of NOx of containing, spray in the burner hearth 1 from the bottom, to reduce the oxygen concentration in the wind one time, reduce combustion temperature in hearth, and the generation reducing substances, NOx is reduced to N 2
B, be blown into Secondary Air from secondary air channel 2 to burner hearth in 1, spray into reducing agent from reducing agent atomizing lance 3 simultaneously, utilize high flow rate and the strong penetration capacity of Secondary Air, with the reducing agent atomizing, and penetrate burner hearth inside, realize the SNCR denitration; The reducing agent that adopts in this example is ammonia.
Consider and contain the higher dust of concentration in the recirculating fluidized bed flue gas, if the flue gas recycled directly air preheater from boiler back end ductwork 6 is drawn, high concentrate dust in the flue gas can produce serious wearing and tearing to recirculation blower 8 so, so in this example, flue gas recycled is introduced from deduster 4 afterbodys, namely flue 7 one ends are communicated with an airduct 5 again, and the other end is communicated with the output of deduster 4.In general deduster 4 tail flue gas temperature still have about 150 ℃, approach with air preheater outlet wind-warm syndrome.Flue gas recycled is kept original fluidising air velocity with after a wind mixes, but wherein oxygen concentration significantly descends.Owing to be fuel-rich combustion, temperature reduces in burning velocity and the stove, thereby thermal NO x reduces.Simultaneously, form reducing atmosphere in dense bed, generate the reducing substanceses such as CO/CN/NH/HCN, these reducing substanceses help NOx to be reduced into N 2But, maintain normal level in order to guarantee burner hearth 1 temperature, need the oxygen content in the control flue gas to be unlikely to too low, so the proportion optimization of flue gas recycled and a wind is 1:1~1:2 among the present invention.
The air that needs burning is divided into primary and secondary air and sends into respectively fluidized bed combustion chamber from diverse location, forms reducing atmosphere in dense bed, realizes sectional combustion, can greatly reduce the formation of thermal NO x, and this is one of major advantage of CFB boiler.But be divided into one, the purpose of Secondary Air also not only that, a wind is directly determining the combustion share of dense bed than (primary air flow accounts for the share of total blast volume), under the same condition, a wind is than large, must cause high dense bed combustion share, just require the low recycle stock of more temperature to return dense bed this moment, take away the burning release heat, to keep the dense bed temperature, inadequate such as circulated material quantity, will cause fluidized-bed temperature too high, can't add coal, load does not increase, this be used for cooling off bed material may from separator collect get off through overcooled circulating ash, or the circulating ash that falls from membrane wall around the burner hearth, ash contacts with membrane wall in dropping process and is cooled off.
In the burning and thermal balance of dense bed, a wind is than less, material balance to circulating ash requires lower, but the in fact restriction of choosing factors such as also being subjected to fuel granularity and character of a wind ratio, a wind are than little, and it is also little to require to be blown afloat the bulky grain ratio that enters the suspension section burning in the fuel, otherwise bulky grain is incomplete because can not get sufficient oxygen combustion, carbon content is high in the bed ash of discharging, and one time the wind ratio is typically chosen in about 50%, then can reach more than 60% anthracite.So the ratio of wind and Secondary Air is preferably 1:1~3:2 among the present invention.
Below in conjunction with Fig. 4 the present embodiment denitrating technique is specifically described: the flue gas that contains NOx that burner hearth 1 internal combustion produces, the particle separation that is mingled with in flue gas through high temperature cyclone separator 9 out, flue gas after the separation enters boiler back end ductwork 6(and arranges successively high temperature superheater from top to bottom, low temperature superheater, economizer, air preheater), then enter deduster 4 dedustings, partial fume after dedusting is directly discharged by chimney 10, another part flue gas is directed to airduct 5 one time under recirculation blower 8 effects, with be blown into from burner hearth 1 bottom after wind mixes, to reduce the oxygen concentration in the wind one time, reduce combustion temperature in hearth, and the generation reducing substances, NOx is reduced to N 2Simultaneously, be blown into Secondary Air from secondary air channel 2 to burner hearth in 1, spray into the ammonia agent from reducing agent atomizing lance 3, utilize high flow rate and the strong penetration capacity of Secondary Air, with ammonia agent atomizing, and penetrate burner hearth 1 inside, realize the SNCR denitration.The flue gas that burning produces is output after high temperature cyclone separator 9 separates again, and so circulation gets final product.
The present invention is applied to the 75t/h CFBB, and NOx initial ejection concentration is 350mg/Nm 3, after the technology of the present invention is transformed, NOx concentration of emission<100mg/Nm 3, the NOx removal efficiency〉and 71.4%.

Claims (10)

1. a flue gas recirculation and ammonia agent are sprayed NOx and are removed device, comprise burner hearth (1), be positioned at the one group of secondary air channel (2) on this burner hearth sidewall, and an airduct (5) that is positioned at this burner hearth bottom, it is characterized in that: the overfire air port place of described secondary air channel (2) is equipped with reducing agent atomizing lance (3).
2. flue gas recirculation according to claim 1 and ammonia agent injection NOx removes device, and it is characterized in that: the nozzle of described reducing agent atomizing lance (3) is positioned at the inboard of secondary air channel (2) spout.
3. flue gas recirculation according to claim 1 and 2 and ammonia agent injection NOx removes device, it is characterized in that: described secondary air channel (2) adopts the dipping type arrangement, and the angle of its air-out direction and horizontal plane is the 10-20 degree.
4. flue gas recirculation according to claim 3 and ammonia agent injection NOx removes device, and it is characterized in that: the injection direction of described reducing agent atomizing lance (3) is identical with the air-out direction of secondary air channel (2) spout.
5. flue gas recirculation according to claim 1 and 2 and ammonia agent injection NOx removes device, and it is characterized in that: the number of described secondary air channel (2) is 4 multiple, two-layer layout about minute, and the spacing between the two-layer secondary air channel (2) is 1-2m up and down; The air quantity of levels Secondary Air is than being 3:2~2:1.
6. flue gas recirculation according to claim 5 and ammonia agent are sprayed NOx and are removed device, and it is characterized in that: the quantity of two-layer secondary air channel (2) is identical, and the secondary air channel (2) that is positioned at same layer positioned opposite in twos.
7. flue gas recirculation according to claim 6 and ammonia agent are sprayed NOx and are removed device, it is characterized in that: two-layer secondary air channel (2) interlaced arrangement up and down.
8. flue gas recirculation according to claim 1 and 2 and ammonia agent are sprayed NOx and are removed device, it is characterized in that: be connected with on the described airduct (5) for the flue gas recycled pipeline (7) that boiler smoke is delivered to an airduct (5), mixes with wind.
9. utilize the described device of claim 1 to reduce the method for NOx in the CFBB flue gas, it is characterized in that step is as follows:
A, in wind, mix a certain proportion of, by burner hearth (1) output and the flue gas recycled that contains NOx after dedusting, again spray in the burner hearth (1), with reduce by one time in the wind oxygen concentration and the ignition temperature in the burner hearth, and generate reducing substances, NOx is reduced to N 2
B, spray into Secondary Air from secondary air channel (2), spray into reducing agent from reducing agent atomizing lance (3) simultaneously, utilize flow velocity and the penetration capacity of Secondary Air, with the reducing agent atomizing, and penetrate burner hearth inside, realize the selective non-catalytic denitration.
10. the method for NOx in the reduction CFBB flue gas according to claim 9, it is characterized in that: the proportioning of described flue gas recycled and a wind is 1:1~1:2; The ratio of wind and Secondary Air is 1:1~3:2.
CN2012105867057A 2012-12-28 2012-12-28 NOx removing device and method by means of exhaust gas recycle and ammonia agent spray Pending CN103041686A (en)

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Cited By (8)

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CN103721552A (en) * 2013-12-16 2014-04-16 东方电气集团东方锅炉股份有限公司 Method for implementing selective non-catalytic reduction denitration during low loading of CFB (Circulating Fluid Bed) boiler
CN105435615A (en) * 2015-12-15 2016-03-30 盐城市兰丰环境工程科技有限公司 Method for recycling cement kiln SNCR denitrification reducing agent
CN105642101A (en) * 2016-01-27 2016-06-08 西安航天源动力工程有限公司 Flue gas recirculation and SNCR joint denitration process system
CN106838932A (en) * 2017-01-15 2017-06-13 浙江富春江环保热电股份有限公司 Sludge incineration denitrating system
CN107213771A (en) * 2017-07-14 2017-09-29 光大环境科技(中国)有限公司 The biomass direct-fired device that flue gas recirculation and SNCR are combined
CN108816020A (en) * 2018-06-08 2018-11-16 湖南大唐节能科技有限公司 A kind of full load combined denitration optimal control method
CN109999630A (en) * 2019-05-08 2019-07-12 武汉立为工程技术有限公司 A kind of SNCR denitration system
CN114877318A (en) * 2022-05-31 2022-08-09 西安华电清洁能源技术有限公司 Circulating fluidized bed boiler nitrogen oxide removal process system suitable for deep peak regulation

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CN201748452U (en) * 2010-06-17 2011-02-16 阿米那电力环保技术开发(北京)有限公司 Nitrogen oxides reducing system based on combination of selective non-catalytic reduction system and combustion system
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Publication number Priority date Publication date Assignee Title
CN103721552A (en) * 2013-12-16 2014-04-16 东方电气集团东方锅炉股份有限公司 Method for implementing selective non-catalytic reduction denitration during low loading of CFB (Circulating Fluid Bed) boiler
CN103721552B (en) * 2013-12-16 2016-08-17 东方电气集团东方锅炉股份有限公司 CFB furnace underload implements the method for SNCR denitration
CN105435615A (en) * 2015-12-15 2016-03-30 盐城市兰丰环境工程科技有限公司 Method for recycling cement kiln SNCR denitrification reducing agent
CN105642101A (en) * 2016-01-27 2016-06-08 西安航天源动力工程有限公司 Flue gas recirculation and SNCR joint denitration process system
CN106838932A (en) * 2017-01-15 2017-06-13 浙江富春江环保热电股份有限公司 Sludge incineration denitrating system
CN107213771A (en) * 2017-07-14 2017-09-29 光大环境科技(中国)有限公司 The biomass direct-fired device that flue gas recirculation and SNCR are combined
CN108816020A (en) * 2018-06-08 2018-11-16 湖南大唐节能科技有限公司 A kind of full load combined denitration optimal control method
CN109999630A (en) * 2019-05-08 2019-07-12 武汉立为工程技术有限公司 A kind of SNCR denitration system
CN114877318A (en) * 2022-05-31 2022-08-09 西安华电清洁能源技术有限公司 Circulating fluidized bed boiler nitrogen oxide removal process system suitable for deep peak regulation

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Application publication date: 20130417