CN103900097A - SCR (selective catalytic reduction) denitrification modification method and SCR denitrification modification device for boilers - Google Patents
SCR (selective catalytic reduction) denitrification modification method and SCR denitrification modification device for boilers Download PDFInfo
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Abstract
The invention discloses an SCR (selective catalytic reduction) denitrification modification method and an SCR denitrification modification device for boilers. The SCR denitrification modification method and the SCR denitrification modification device are mainly used for the boilers with coal economizers and air preheaters which are arranged in a two-stage staggered manner. The SCR denitrification modification method includes shifting low-temperature coal economizers to SCR reactors; modifying communication air channels among high-temperature air preheaters and low-temperature air preheaters to form vertical air preheaters; arranging lead-out flues at the rears of the high-temperature air preheaters and enabling the lead-out flues to intersect with upper portions of the vertical air preheaters; enabling to-be-denitrated flue gas to flow through the outsides of pipes of the vertical air preheaters and flow into denitration reactors; arranging lead-in flues below the lead-out flues and enabling the lead-in flues to intersect with the lower portions of the vertical air preheaters; enabling denitrated flue gas to flow through the outsides of the pipes of the vertical air preheaters and flow into the low-temperature air preheaters. Problems of conflict among lead-out flues, lead-in flues and communication air channels and matching of ammonia and nitrogen under variable working conditions can be solved by the aid of the SCR denitrification modification method. The SCR denitrification modification method and the SCR denitrification modification device have the advantages of compact structure, high denitrification efficiency and the like.
Description
Technical field
The invention belongs to selective-catalytic-reduction denitrified (SCR) technical field, relate to particularly a kind of boiler SCR denitration remodeling method and device for economizer and air preheater twin-stage interlaced arrangement.
Background technology
Increasingly strict along with Environmental Protection in China rules, increasing Built hydropower station need to undergo technological transformation, to boiler configuration SCR denitrification apparatus, to meet discharge standard requirement.According to statistics, end 2013, China has completed 4.3 hundred million kilowatts of denitration transformations, also remains approximately 400,000,000 kilowatts of needs and carries out denitration transformation.These are waited to transform old-fashioned boiler and have conventionally arranged sectionalized economizer and tube-type air preheater in tail vertical well gas flue, compact conformation, and wherein also having quite a few is the boiler of economizer and air preheater twin-stage interlaced arrangement.
For these boilers, if adopt conventional remodeling method, must split existing modular heating surface, to obtain suitable temperature window, meet the requirement of SCR denitration reaction to flue-gas temperature, but even if temperature window is positioned at the space for maintenance between adjacent heating surface just, also may not there be the drawing and introducing for denitration flue of enough height in these spaces.In conventional denitration modification scheme, in order to guarantee the smooth and easy of flow of flue gas, save transformation space, denitration flue is drawn and is introduced from the rear portion of vertical well gas flue often, this boiler for those vertical well gas flue rear portion no-flues and air channel is practicable, but for economizer and air preheater twin-stage interlaced arrangement boiler, adopt conventional method very likely can cause fighting of denitration flue and UNICOM air channel.Certainly, for fear of the generation of above situation, denitration flue also can draw and introduce from the side of vertical well gas flue, but the flue of transforming like this need experience the turning of the large displacement of multi-angle, and structure relative complex is unfavorable for being evenly distributed of flow field very much, affects NH
3mixing with NOx.
Simultaneously, a valve of tradition ammonia-spraying grid is often responsible for the adjusting of multiple nozzle flows, this method for arranging is difficult to realize the differentiation adjusting of each point on regional area, particularly in the time that operating condition changes, on flue cross section, can produce larger velocity gradient and concentration ladder, the serious mismatch problem that now adopts traditional ammonia-spraying grid can bring ammonia spraying amount and NOx to distribute.Simultaneously, the tradition spray ammonia control method feedback signal using local sampling point data as Pen An executing agency conventionally, because actual measurement point can only limitedly be arranged on the wall of flue limit, therefore can cause larger error using these measurement data as feedback signal control ammonia spraying amount.
Known by above analysis, adopt traditional method of denitration transformation economizer and air preheater twin-stage interlaced arrangement boiler also to have technical problem and the engineering problem of much complex, a kind of new specially for the SCR denitration remodeling method of economizer and air preheater twin-stage interlaced arrangement boiler in the urgent need to developing.
Summary of the invention
Goal of the invention: for solving problems of the prior art, the present invention proposes a kind of boiler SCR denitration remodeling method, mainly to carry out SCR denitration remodeling method for the boiler of economizer and air preheater twin-stage interlaced arrangement, install denitration additional at the temperature window of vertical well gas flue and draw flue and introduce flue Existential Space deficiency the boiler of economizer and air preheater twin-stage interlaced arrangement being carried out to SCR denitration when transformation thereby solve, while adopting conventional denitration remodeling method, exist and draw flue and introduce flue and high low temperature air preheater UNICOM air channel and fight, adopting side to go out side enters remodeling method and makes system complex and then affect ammonia nitrogen mixing, when boiler operatiopn variation of operating parameters, ammonia spraying amount and NOx distribute and the problem such as do not mate.The technical problem that the present invention also will solve is to provide a kind of boiler SCR denitration remodeling method.
Technical scheme: for realizing above-mentioned technical purpose, the present invention proposes a kind of boiler SCR denitration remodeling method, described heated surface at the end of boiler is furnished with successively from high to low high-temperature economizer in vertical well gas flue, high temperature air preheater, low-level (stack-gas) economizer and low temperature air preheater, high temperature air preheater and low temperature air preheater are horizontal layout in vertical well gas flue, entrance air channel, low latitude and low Air Export air channel are separately positioned on the both sides of low temperature air preheater, high Air Export air channel and entrance air channel, high-altitude are arranged at respectively the both sides of high temperature air preheater, entrance air channel, described high-altitude is connected by UNICOM air channel with low Air Export air channel.For realizing the SCR denitration transformation of above-mentioned boiler, remodeling method comprises the steps:
(a) low-level (stack-gas) economizer is shifted out to vertical well gas flue, the space of vacateing is as the introducing flue and the per-interface space of drawing flue of SCR denitrification apparatus;
(b) reduce high temperature air preheater and low temperature air preheater part heating surface area, according to the structure in UNICOM air channel between high temperature air preheater and low temperature air preheater, the heating surface area combination of the high temperature air preheater of minimizing and low temperature air preheater is transformed into a vertical air preheater, is placed in UNICOM air channel;
(c) draw the flue of drawing of SCR denitrification apparatus from the vertical well gas flue level of high temperature air preheater downside, described draw flue through behind the top of vertical air preheater more successively with uptake flue, turn to flue and denitration flue to be connected, in described uptake flue, be provided with ammonia-spraying grid, in described denitration flue, be provided with SCR Benitration reactor; The low-level (stack-gas) economizer shifting out in step (a) is arranged to the below of SCR Benitration reactor, then described denitration flue is connected with the introducing flue of SCR denitrification apparatus again, and then described introducing flue is connected with low temperature air preheater through the bottom of vertical air preheater;
(d) heating surface area of increase or minimizing low-level (stack-gas) economizer, makes the feed temperature after low-level (stack-gas) economizer heating maintain the temperature before SCR transformation; The heating surface area that increases or reduce high-temperature economizer remains between 320～400 ℃ the flue-gas temperature between high temperature air preheater and low-level (stack-gas) economizer in the time of boiler rated load operation;
(e) ammonia-spraying grid in uptake flue is connected with executing agency and computer successively.
Preferably, at described interface of drawing flue and high temperature air preheater, pre-dedusting ash bucket and pre-dedusting outlet are set, for discharging the fly ash granule depositing when flue gas turns to.
Preferably, dedusting ash bucket and rear dedusting outlet after described denitration flue and the interface of introducing flue arrange, the fly ash granule of deposition while turning to for getting rid of flue gas.
For further saving flue, described introducing flue is arranged to the below of drawing flue, and it is all vertical with UNICOM air channel described in making, to draw flue and introducing flue.
Draw junction, turning, the uptake flue of flue and uptake flue and turn to the junction, turning of flue and turn to flue and the junction, turning of denitration flue all arranges deflector described, making in flue flue gas flow rate even by deflector is set.
After boiler is transformed in a manner described, adopt the method for CFD numerical simulation, burning in stove and full denitrating system flow behavior are carried out to numerical computations, simulate under different service conditions in stove flue-gas temperature field, component (NOx, O in combustion case and flue
2, fly ash granule) distribution character of concentration field and velocity field, obtain flue along journey diverse location NOx Flux Distribution, set up associated between operating condition (initial conditions) and NOx Flux Distribution (output condition), form database and be also stored in computer.When actual motion, boiler operating parameter input computer is as the input parameter of ammonia-spraying grid executing agency, executing agency calls the database data of calculator memory storage and compares in real time, determines best ammonia spraying amount data, and ammonia-spraying grid regulates the ammonia spraying amount of every bit according to input parameter.
The invention allows for a kind of boiler SCR denitrification apparatus, comprise successively the vertical well gas flue that connects, horizontally disposed draw flue, vertically arrange uptake flue, turn to flue, denitration flue and horizontally disposed introducing flue, wherein, in described vertical well gas flue, be disposed with from top to bottom high-temperature economizer and high temperature air preheater; In described uptake flue, be provided with ammonia-spraying grid, described ammonia-spraying grid is connected with executing agency and computer successively; In described denitration flue, be disposed with from top to bottom SCR denitrification apparatus and low-level (stack-gas) economizer, the afterbody of described introducing flue is connected with low temperature air preheater; Described low temperature air preheater and high temperature air preheater communicate by UNICOM air channel, and described UNICOM is vertically provided with vertical air preheater in air channel, described in draw flue and introduce flue respectively through this vertical air preheater.
Preferably, described in draw flue and high temperature air preheater interface be provided with pre-dedusting ash bucket and pre-dedusting outlet, for discharging the fly ash granule of flue gas deposition while turning to.
Preferably, described denitration flue is provided with rear dedusting ash bucket and rear dedusting outlet, the fly ash granule of deposition while turning to for getting rid of flue gas with the interface of introducing flue.
Wherein, described introducing flue is arranged at the below of drawing flue, and described introducing flue is with to draw flue all vertical with UNICOM air channel.
Preferably, described in, draw junction, turning, the uptake flue of flue and uptake flue and turn to the junction, turning of flue and turn to flue and the junction, turning of denitration flue is provided with deflector.
Beneficial effect: compared with prior art, the present invention has advantages of as follows:
(1) the present invention rests on after high temperature air preheater SCR reaction temperature window by the heating surface of adjusting high-temperature economizer, the flue to SCR reactor rear portion by low-level (stack-gas) economizer global transfer simultaneously, this remodeling method has not only guaranteed to have suitable reaction condition at correct position, and has solved the per-interface space problem of drawing flue and introducing flue.
(2) the present invention is directed to the special construction of economizer and air preheater twin-stage interlaced arrangement boiler, the part heating surface integration and upgrade of high and low temperature air preheater is become to an independently air preheater, and be placed in UNICOM air channel, this remodeling method has not only kept the original arrangement mode of back-end surfaces substantially, and further increased the height of per-interface space, be conducive to reduce improvement cost.
(3) draw and introduce the vertical air preheater of placing in flue not only as back-end surfaces, and can be used as rectifier, contribute to the even of the interior flue gas flow rate of horizontal flue.
(4) the tradition spray ammonia control method feedback signal using local sampling point data as Pen An executing agency conventionally, because actual measurement point can only limitedly be arranged in flue limit wall, therefore also there is larger error using these measurement data as feedback signal, Flow Field Distribution in the different operating mode lower flues of numerical simulation of the present invention, the database forming is stored in computer, executing agency is by comparing actual condition and the Ku Nei operating mode fine adjustment ammonia-spraying grid ammonia spraying amount at every bit, this method can be according to the ammonia of the flux matched correspondence of NOx of arbitrfary point on flue cross section, there is denitration efficiency high, the advantage that the escaping of ammonia rate is low.
Accompanying drawing explanation
Fig. 1 is the layout schematic diagram before boiler improvement, wherein has: flue entrance A, flue outlet B, feed-water intake C, give water out D, cold air inlet G, hot-blast outlet H, vertical well gas flue 1, high-temperature economizer 2, high outlet header 3, high import header 4, tube connector 5, low province outlet header 6, high temperature air preheater 7, entrance air channel, high-altitude 8, high Air Export air channel 9, low-level (stack-gas) economizer 11, low province entrance header 12, low Air Export air channel 13, low temperature air preheater 14, entrance air channel, low latitude 15 and the UNICOM air channel 29 of economizing of economizing.
Fig. 2 is the layout schematic diagram with the boiler of SCR denitrification apparatus after transformation, wherein have: flue entrance A, flue outlet B, feed-water intake C, give water out D, pre-dedusting outlet E, rear dedusting outlet F, cold air inlet G, hot-blast outlet H, vertical well gas flue 1, high-temperature economizer 2, the high outlet header 3 of economizing, the high import header 4 of economizing, tube connector 5, low province outlet header 6, high temperature air preheater 7, entrance air channel, high-altitude 8, high Air Export air channel 9, vertical air preheater 10, low-level (stack-gas) economizer 11, low province entrance header 12, low Air Export air channel 13, low temperature air preheater 14, entrance air channel, low latitude 15, pre-dedusting ash bucket 17, rear dedusting ash bucket 18, ammonia-spraying grid 19, uptake flue 20, executing agency 21, computer 22, rectifier 23, catalyst 24, denitration pipeline 25, draw flue 26, introduce flue 27 and deflector 28.
The specific embodiment
Describe the invention process in detail referring to Fig. 1-2.The present embodiment is implemented under take the technical program as prerequisite, has provided detailed embodiment and operating process, but protection scope of the present invention is not limited to following embodiment.
The present embodiment carries out SCR denitration transformation for certain 220t/h of power plant boiler.Before transformation, this heated surface at the end of boiler is arranged successively from high to low high-temperature economizer 2, high temperature air preheater 7, low-level (stack-gas) economizer 11 and low temperature air preheater 14 in vertical well gas flue 1, high-temperature flue gas flows through from each heating surface tube, temperature reduces gradually, boiler is in the time of rated load operation, and the flue-gas temperature between high temperature air preheater 7 and low-level (stack-gas) economizer 11 is 336 ℃.Being arranged in high-temperature economizer 2 in vertical well gas flue 1 economizes import header 5 He Gao with height respectively outward at flue and economizes outlet headers 3 and be connected, low-level (stack-gas) economizer 11 is connected with low temperature import header 12 and low temperature outlet header 6 respectively outward at flue, and low province outlet header 6 He Gao province import headers 5 connect by tube connector 5, feedwater enters low-level (stack-gas) economizer 11 from low province import header 12, and become adverse current upwards to flow at Guan Zhongyu flue gas, after heated, be pooled to low province outlet header 6, the feedwater flow of heating enters the high import header 4 of economizing through tube connector 5, economize import header 4 from height again and enter high-temperature economizer 2, and become adverse current upwards to flow at Guan Zhongyu flue gas, further after heating, be pooled to the high outlet header 3 of economizing.High temperature air preheater 7 and low temperature air preheater 14 are horizontal layout in vertical well gas flue 1, high temperature air preheater 7 is connected with entrance air channel, high-altitude 8 and high Air Export air channel 9 respectively outward at flue, low temperature air preheater 14 both sides are connected with respectively entrance air channel, low latitude 15 and low Air Export air channel 13, and low Air Export air channel 13 is connected by UNICOM air channel 29 with entrance air channel, high-altitude 8, cold wind enters low temperature air preheater 14 from entrance air channel, low latitude 15, and become cross flow one at Guan Zhongyu flue gas, after heating, be pooled to low Air Export air channel 13, hot air flow enters entrance air channel, high-altitude 8 through UNICOM air channel 29, enter high temperature air preheater 7 from entrance air channel, high-altitude 8 again, and become cross flow one at Guan Zhongyu flue gas, further after heating, be pooled to high Air Export air channel 9.
For the boiler of said structure type, the SCR denitration remodeling method of taking is as follows:
(1) low-level (stack-gas) economizer 11 is shifted out to vertical well gas flue 1, the space of vacateing is as the introducing flue 27 and the per-interface space of drawing flue 26 of SCR denitrification apparatus;
(2) reduce high temperature air preheater 7 and low temperature air preheater 14 part heating surface areas, according to the structure in UNICOM air channel 29 between high temperature air preheater 7 and low temperature air preheater 14, the heating surface area combination of the high temperature air preheater 7 of minimizing and low temperature air preheater 14 is transformed into a vertical air preheater 10, is placed in UNICOM air channel 29;
(3) that draws SCR denitrification apparatus from vertical well gas flue 1 level of high temperature air preheater 7 downsides draws flue 26, and be provided with pre-dedusting ash bucket 17 and pre-dedusting outlet E at the interface of drawing flue 26 and high temperature air preheater 7, for discharging the fly ash granule depositing when flue gas turns to.Draw flue 26 through behind the top of vertical air preheater 10 more successively with uptake flue 20, turn to flue 16 and denitration flue 25 to be connected, drawing turning junction, the uptake flue 20 of flue 26 with uptake flue 20 and turning to the junction, turning of flue 16 and turn to flue 16 and the junction, turning of denitration flue 25 to be respectively arranged with deflector 28.Wherein, be provided with ammonia-spraying grid 19 in uptake flue 20, be provided with SCR Benitration reactor in denitration flue 25, this SCR Benitration reactor comprises rectifier 23 and is placed in the catalyst 24 of rectifier 23 belows; The low-level (stack-gas) economizer 11 shifting out in step (1) is arranged to the below of SCR Benitration reactor, then denitration flue 25 is connected with the introducing flue 27 of SCR denitrification apparatus again, dedusting ash bucket 18 and rear dedusting outlet F after denitration flue 25 and the interface of introducing flue 27 arrange, the fly ash granule of deposition while turning to for getting rid of flue gas; Introducing flue 27 is then connected with low temperature air preheater 14 through the bottom of vertical air preheater 10; Wherein, in order to save flue and to optimize pipe arrangement, this introducing flue 27 is arranged at the below of drawing flue 26, introduces flue 27 and to draw flue 26 all vertical with UNICOM air channel 29.
(4) heating surface area of increase or minimizing low-level (stack-gas) economizer 11, makes the feed temperature after low-level (stack-gas) economizer 11 heating maintain the temperature before SCR transformation; The heating surface area that increases or reduce high-temperature economizer 2 remains between 320～400 ℃ the flue-gas temperature between high temperature air preheater 7 and low-level (stack-gas) economizer 11 in the time of boiler rated load operation.Like this, first the flue gas after denitration passes through low-level (stack-gas) economizer 11 heated feed waters, then through 90.After turning to, by the bottom of vertical air preheater 10, same heating flows to the air of high temperature air preheater from low temperature air preheater 14, finally by 90.After turning to, enter low temperature air preheater 14.
(5) ammonia-spraying grid in uptake flue 20 19 is connected with executing agency 21 and computer 22 successively.
Improved boiler SCR denitrification apparatus as shown in Figure 2, comprise successively the vertical well gas flue 1 that connects, horizontally disposed draw flue 26, vertically arrange uptake flue 20, turn to flue 16, denitration flue 25 and horizontally disposed introducing flue 27, wherein, in vertical well gas flue 1, be disposed with from top to bottom high-temperature economizer 2 and high temperature air preheater 7; In uptake flue 20, be provided with ammonia-spraying grid 19, ammonia-spraying grid 19 is connected with executing agency 21 and computer 22 successively; In denitration flue, be disposed with from top to bottom SCR denitrification apparatus and low-level (stack-gas) economizer 11, the afterbody of introducing flue 27 is connected with low temperature air preheater 14; Low temperature air preheater 14 and high temperature air preheater 7 communicate by UNICOM air channel 29, and UNICOM air channel 2 is interior is vertically provided with vertical air preheater 10, draw flue 26 and introduce flue 27 respectively through this vertical air preheater 10.Be provided with pre-dedusting ash bucket 17 and pre-dedusting outlet at the interface of drawing flue 26 and high temperature air preheater 7, for discharging the fly ash granule depositing when flue gas turns to.Dedusting ash bucket 18 and rear dedusting outlet after denitration flue 25 and the interface of introducing flue 27 are provided with, the fly ash granule of deposition while turning to for getting rid of flue gas.
Wherein, introduce flue 27 and be arranged at the below of drawing flue 26, introduce flue 27 and to draw flue 26 all vertical with UNICOM air channel 29.Drawing flue 26 junction, turning, uptake flue 20 with uptake flue 20 and turning to the junction, turning of flue 16 and turn to flue 16 and the junction, turning of denitration flue 25 to be provided with deflector 28.
Above-mentioned boiler SCR denitrification apparatus in use, adopts the method for CFD numerical simulation, and burning in stove and full denitrating system flow behavior are carried out to numerical computations, simulates under different service conditions in stove flue-gas temperature field, component (NOx, O in combustion case and flue
2, fly ash granule) distribution character of concentration field and velocity field, obtain flue along journey diverse location NOx Flux Distribution, set up associated between operating condition (initial conditions) and NOx Flux Distribution (output condition), form database and be also stored in computer.When actual motion, boiler operating parameter input computer is as the input parameter of ammonia-spraying grid executing agency, executing agency calls the database data of calculator memory storage and compares in real time, determine best ammonia spraying amount data, ammonia-spraying grid regulates the ammonia spraying amount of every bit according to input parameter, can avoid like this tradition spray ammonia control method feedback signal using local sampling point data as Pen An executing agency conventionally, because actual measurement point can only limitedly be arranged in flue limit wall, therefore also there is larger error using these measurement data as feedback signal, and Flow Field Distribution in the different operating mode lower flues of numerical simulation of the present invention, the database forming is stored in computer, executing agency is by comparing actual condition and the Ku Nei operating mode fine adjustment ammonia-spraying grid ammonia spraying amount at every bit, this method can be according to the ammonia of the flux matched correspondence of NOx of arbitrfary point on flue cross section, there is denitration efficiency high, the advantage that the escaping of ammonia rate is low.
Claims (10)
1. a boiler SCR denitration remodeling method, described heated surface at the end of boiler is furnished with successively from high to low high-temperature economizer (2) in vertical well gas flue (1), high temperature air preheater (7), low-level (stack-gas) economizer (11) and low temperature air preheater (14), high temperature air preheater (7) and low temperature air preheater (14) are horizontal layout in vertical well gas flue (14), entrance air channel, low latitude (15) and low Air Export air channel (13) are separately positioned on the both sides of low temperature air preheater (14), high Air Export air channel (9) and high-altitude enter one's intention as revealed in what one says (8) road and are arranged at respectively the both sides of high temperature air preheater (7), described low Air Export air channel (13) is connected by UNICOM air channel (29) with entrance air channel, high-altitude (8), it is characterized in that, described boiler SCR denitration remodeling method comprises the steps:
(a) low-level (stack-gas) economizer (11) is shifted out to vertical well gas flue (1), the space of vacateing is as the introducing flue (27) of SCR denitrification apparatus and draw the per-interface space of flue (26);
(b) reduce high temperature air preheater (7) and low temperature air preheater (14) part heating surface area, according to the structure in UNICOM air channel (29) between high temperature air preheater (7) and low temperature air preheater (14), the heating surface area combination of the high temperature air preheater (7) reducing and low temperature air preheater (14) is transformed into a vertical air preheater (10), is placed on (29) in UNICOM air channel;
(c) that draws SCR denitrification apparatus from vertical well gas flue (1) level of high temperature air preheater (7) downside draws flue (26), described draw flue (26) through behind the top of vertical air preheater (10) more successively with uptake flue (20), turn to flue (16) and denitration flue (25) to be connected, in described uptake flue (20), be provided with ammonia-spraying grid (19), described denitration flue is provided with SCR Benitration reactor in (25); The low-level (stack-gas) economizer (11) shifting out in step (a) is arranged to the below of SCR Benitration reactor, then described denitration flue (25) is connected with the introducing flue (27) of SCR denitrification apparatus again, and described introducing flue (27) is then connected with low temperature air preheater (14) through the bottom of vertical air preheater (10);
(d) heating surface area of increase or minimizing low-level (stack-gas) economizer (11), makes the feed temperature after low-level (stack-gas) economizer (11) heating maintain the temperature before SCR transformation; The heating surface area that increases or reduce high-temperature economizer (2) remains between 320～400 ℃ the flue-gas temperature between high temperature air preheater (7) and low-level (stack-gas) economizer (11) in the time of boiler rated load operation;
(e) ammonia-spraying grid (19) in uptake flue (20) is connected with executing agency (21) and computer (22) successively.
2. boiler SCR denitration remodeling method according to claim 1, it is characterized in that, with the interface of high temperature air preheater (7), pre-dedusting ash bucket (17) and pre-dedusting outlet are set at the described flue (26) of drawing, for discharging the fly ash granule depositing when flue gas turns to.
3. boiler SCR denitration remodeling method according to claim 1, it is characterized in that, at described denitration flue (25) and the interface of introducing flue (27), rear dedusting ash bucket (18) and rear dedusting outlet, the fly ash granule of deposition while turning to for getting rid of flue gas are set.
4. boiler SCR denitration remodeling method according to claim 1, it is characterized in that, described introducing flue (27) is arranged to the below of drawing flue (26), makes described introducing flue (27) and to draw flue (26) all vertical with UNICOM air channel (29).
5. boiler SCR denitration remodeling method according to claim 1, it is characterized in that, draw junction, turning, the uptake flue (20) of flue (26) and uptake flue (20) and turn to the junction, turning of flue (16) and turn to flue (16) and the junction, turning of denitration flue (25) that deflector (28) is all set described.
6. a boiler SCR denitration device for modifying, it is characterized in that, comprise successively the vertical well gas flue (1) that connects, horizontally disposed draw flue (26), vertically arrange uptake flue (20), turn to flue (16), denitration flue (25) and horizontally disposed introducing flue (27), wherein, in described vertical well gas flue (1), be disposed with from top to bottom high-temperature economizer (2) and high temperature air preheater (7); In described uptake flue (20), be provided with ammonia-spraying grid (19), described ammonia-spraying grid (19) is connected with executing agency (21) and computer (22) successively; In described denitration flue, be disposed with from top to bottom SCR denitrification apparatus and low-level (stack-gas) economizer (11), the afterbody of described introducing flue (27) is connected with low temperature air preheater (14); Described low temperature air preheater (14) and high temperature air preheater (7) communicate by UNICOM air channel (29), described UNICOM is vertically provided with vertical air preheater (10) in air channel (2), described in draw flue (26) and introduce flue (27) respectively through this vertical air preheater (10).
7. boiler SCR denitration device for modifying according to claim 6, it is characterized in that, the described flue (26) of drawing is provided with pre-dedusting ash bucket (17) and pre-dedusting outlet with the interface of high temperature air preheater (7), for discharging the fly ash granule depositing when flue gas turns to.
8. boiler SCR denitration device for modifying according to claim 6, it is characterized in that, described denitration flue (25) is provided with rear dedusting ash bucket (18) and rear dedusting outlet, the fly ash granule of deposition while turning to for getting rid of flue gas with the interface of introducing flue (27).
9. boiler SCR denitration device for modifying according to claim 6, it is characterized in that, described introducing flue (27) is arranged at the below of drawing flue (26), and described introducing flue (27) is with to draw flue (26) all vertical with UNICOM air channel (29).
10. boiler SCR denitration device for modifying according to claim 6, it is characterized in that, described in draw flue (26) and uptake flue (20) junction, turning, uptake flue (20) with turn to the junction, turning of flue (16) and turn to flue (16) and the junction, turning of denitration flue (25) is provided with deflector (28).
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| CN201410115429.5A CN103900097B (en) | 2014-03-26 | 2014-03-26 | A kind of boiler SCR denitration remodeling method and device |
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| CN105485894A (en) * | 2015-12-23 | 2016-04-13 | 杭州燃油锅炉有限公司 | Pulverized coal type water heating boiler |
| CN105570916A (en) * | 2014-10-08 | 2016-05-11 | 中国石油化工股份有限公司 | Coal-fired boiler smoke denitrification apparatus and denitrification method |
| CN105597530A (en) * | 2015-12-29 | 2016-05-25 | 杭州新际能源科技有限公司 | Denitration system applied to coal dust boiler |
| CN105771642A (en) * | 2016-04-29 | 2016-07-20 | 大唐环境产业集团股份有限公司 | Horizontal SCR (selective catalytic reduction) denitration reactor |
| CN106247324A (en) * | 2016-08-31 | 2016-12-21 | 江苏汇能锅炉有限公司 | Efficient circulation vulcanization bed coal-burning boiler coal economizer |
| CN106287683A (en) * | 2016-08-31 | 2017-01-04 | 江苏汇能锅炉有限公司 | Circulating fluid-bed coal-burning boiler coal economizer energy-conserving reconstruction method |
| CN106322416A (en) * | 2016-08-17 | 2017-01-11 | 中国华能集团清洁能源技术研究院有限公司 | Catalytic removal device for NOx and CO in tail flue of pi-shaped pulverized coal boiler |
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| CN106582281A (en) * | 2015-10-15 | 2017-04-26 | 中国石油化工股份有限公司 | Coal fired boiler low-load operation SCR denitration device and process thereof |
| CN106871148A (en) * | 2017-03-31 | 2017-06-20 | 冯力燕 | The threeway switching device of Denitration in Boiler |
| CN107606629A (en) * | 2017-10-26 | 2018-01-19 | 北京启创天工电力技术应用有限公司 | A kind of anti-blocking grey ammonium hydrogen sulfate vaporization heater of SCR denitration unit air preheater |
| CN107869726A (en) * | 2017-09-30 | 2018-04-03 | 大唐东北电力试验研究所有限公司 | Thermal generation unit denitrating flue gas remodeling method |
| CN107899415A (en) * | 2017-11-10 | 2018-04-13 | 东南大学 | A kind of wide load denitrification apparatus of coke oven flue gas |
| CN111151131A (en) * | 2020-02-28 | 2020-05-15 | 中国华能集团清洁能源技术研究院有限公司 | Normal-temperature SCR denitration device and process for improving denitration efficiency of boiler |
| CN112156649A (en) * | 2020-09-24 | 2021-01-01 | 南京工业大学 | Multi-level refined intelligent denitration system and method based on big data and firefly algorithm |
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| CN105570916A (en) * | 2014-10-08 | 2016-05-11 | 中国石油化工股份有限公司 | Coal-fired boiler smoke denitrification apparatus and denitrification method |
| CN106582281A (en) * | 2015-10-15 | 2017-04-26 | 中国石油化工股份有限公司 | Coal fired boiler low-load operation SCR denitration device and process thereof |
| CN105485894A (en) * | 2015-12-23 | 2016-04-13 | 杭州燃油锅炉有限公司 | Pulverized coal type water heating boiler |
| CN105597530A (en) * | 2015-12-29 | 2016-05-25 | 杭州新际能源科技有限公司 | Denitration system applied to coal dust boiler |
| CN105597530B (en) * | 2015-12-29 | 2017-10-13 | 杭州新际能源科技有限公司 | A kind of denitrating system applied in pulverized-coal fired boiler |
| CN105771642A (en) * | 2016-04-29 | 2016-07-20 | 大唐环境产业集团股份有限公司 | Horizontal SCR (selective catalytic reduction) denitration reactor |
| CN106322416A (en) * | 2016-08-17 | 2017-01-11 | 中国华能集团清洁能源技术研究院有限公司 | Catalytic removal device for NOx and CO in tail flue of pi-shaped pulverized coal boiler |
| CN106287683A (en) * | 2016-08-31 | 2017-01-04 | 江苏汇能锅炉有限公司 | Circulating fluid-bed coal-burning boiler coal economizer energy-conserving reconstruction method |
| CN106439798A (en) * | 2016-08-31 | 2017-02-22 | 江苏汇能锅炉有限公司 | Coal economizer for circulating fluid bed coal-fired boiler |
| CN106247324A (en) * | 2016-08-31 | 2016-12-21 | 江苏汇能锅炉有限公司 | Efficient circulation vulcanization bed coal-burning boiler coal economizer |
| CN106439798B (en) * | 2016-08-31 | 2018-12-18 | 江苏汇能锅炉有限公司 | Circulating fluid-bed coal-burning boiler economizer |
| CN106871148A (en) * | 2017-03-31 | 2017-06-20 | 冯力燕 | The threeway switching device of Denitration in Boiler |
| CN107869726A (en) * | 2017-09-30 | 2018-04-03 | 大唐东北电力试验研究所有限公司 | Thermal generation unit denitrating flue gas remodeling method |
| CN107606629A (en) * | 2017-10-26 | 2018-01-19 | 北京启创天工电力技术应用有限公司 | A kind of anti-blocking grey ammonium hydrogen sulfate vaporization heater of SCR denitration unit air preheater |
| CN107899415A (en) * | 2017-11-10 | 2018-04-13 | 东南大学 | A kind of wide load denitrification apparatus of coke oven flue gas |
| CN107899415B (en) * | 2017-11-10 | 2020-10-02 | 东南大学 | Coke oven flue gas wide-load denitration device |
| CN111151131A (en) * | 2020-02-28 | 2020-05-15 | 中国华能集团清洁能源技术研究院有限公司 | Normal-temperature SCR denitration device and process for improving denitration efficiency of boiler |
| CN111151131B (en) * | 2020-02-28 | 2024-01-30 | 中国华能集团清洁能源技术研究院有限公司 | Normal-temperature SCR denitration device and technology for improving denitration efficiency of boiler |
| CN112156649A (en) * | 2020-09-24 | 2021-01-01 | 南京工业大学 | Multi-level refined intelligent denitration system and method based on big data and firefly algorithm |
| CN112156649B (en) * | 2020-09-24 | 2021-07-20 | 南京工业大学 | Multi-level refined intelligent denitration system and method based on big data and firefly algorithm |
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