CN210057875U - Rotary-vane SNCR denitration mixing system for pulverized coal furnace - Google Patents
Rotary-vane SNCR denitration mixing system for pulverized coal furnace Download PDFInfo
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- CN210057875U CN210057875U CN201920712701.6U CN201920712701U CN210057875U CN 210057875 U CN210057875 U CN 210057875U CN 201920712701 U CN201920712701 U CN 201920712701U CN 210057875 U CN210057875 U CN 210057875U
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Abstract
The utility model discloses a rotary vane formula SNCR denitration hybrid system for buggy stove belongs to SNCR technical field. The cyclone mixer consisting of a plurality of cyclones with the number of less than 0.6 is arranged in the horizontal flue, so that flue gas mixed with the reducing agent sprayed by the first reducing agent spraying point and the second reducing agent spraying point flows through the cyclone mixer to form weak cyclone, the mixing of the flue gas and the reducing agent is enhanced, the molecular contact probability of reducing agent liquid drops and NOx in the flue gas is improved, the integral residence time of the flue gas is prolonged, the time in the optimal denitration temperature interval is increased, the SNCR denitration efficiency is improved, the denitration proportion of an SCR reactor of the pulverized coal furnace is reduced, the catalyst volume is reduced, the denitration operation cost is reduced, meanwhile, the escape of the reducing agent can be reduced, and the cyclone mixer is beneficial to the ash coke accumulated on the subsequent tail heating surface.
Description
Technical Field
The utility model belongs to the technical field of the buggy stove SNCR, concretely relates to rotary vane formula SNCR denitration hybrid system for buggy stove.
Background
Among the atmospheric pollutants discharged by coal-fired power generation, NOx is a main atmospheric pollutant, NOx and hydrocarbon can cause photochemical pollution under the action of strong light, and NOx discharged into the atmosphere is a main cause of acid rain formation and seriously harms the ecological environment. At present, about 65% of NOx in China is generated by coal combustion, so that a power station boiler and an industrial boiler which are main coal-fired equipment become a focus of attention which is necessary for controlling NOx emission in the future.
In summary, methods for controlling NOx emissions are largely divided into three areas: pre-combustion control, in-combustion control, and post-combustion control. The method of pre-combustion control is to reduce the nitrogen content in the fuel such as coal, thereby reducing the generation of NOx. However, the methods of coal washing, coal blending, coal dressing, ammonia addition and denitrification and the like are high in cost and complex in process, and have little effect on removing thermal NOx, so that the related applications are few. At present, the main application of flue gas denitration focuses on the burning process and the burning process. Denitration based on the combustion process comprises the following steps: flue gas recirculation technology, air staged combustion, fuel staged combustion technology, low nitrogen burner technology, low excess air combustion technology, and the like. The use of these improvements in the combustion process can reduce NOx formation to some extent, but the denitration rate is not improved. And also causes negative effects such as reduction of combustion efficiency. The post-combustion control, i.e., flue gas denitration technology, is mainly classified into selective non-catalytic reduction (SNCR) and Selective Catalytic Reduction (SCR) technologies. The SNCR technology is to spray a reducing agent (usually ammonia water, urea or other amino substances with certain concentration) into a furnace chamber at a proper temperature (generally 850-1000 ℃) by adopting a special nozzleThe reducing agent is mixed with the flue gas to generate a series of chemical reactions to change NOx in the flue gas into N2Thereby achieving the aim of denitration. The SCR technology is characterized in that ammonia, hydrocarbon and other reducing agents are sprayed into flue gas for reaction, and simultaneously a catalyst is added to convert NOx into pollution-free N2And H2And O. The chemical composition, structure, life cycle and price of the catalyst can directly influence the denitration efficiency of the SCR technology. In the denitration process of the existing coal-fired unit, most of NOx is basically removed by a flue gas denitration technology after combustion, and then a control method in partial combustion is used as an auxiliary method.
At present, flue gas denitration of most pulverized coal furnaces is mainly realized by a low-nitrogen combustor, a staged combustion technology and an SNCR denitration combined SCR technology, and the following problems exist: 1) on the premise of not influencing combustion efficiency, the low-nitrogen and staged combustion technology has limited reduction of the original emission of NOx; 2) SNCR denitration efficiency is low, ammonia or urea and flue gas are not fully mixed, and retention time is insufficient; 3) the SCR denitration efficiency is higher than the integral denitration efficiency, the service life of the catalyst and the expensive price of the catalyst enable the operation cost to be higher, and the efficiency of the catalyst also directly influences the instability of the integral denitration efficiency.
The patent document with publication number CN204933218U discloses a SNCR + SCR combined denitration device for a pulverized coal furnace, which is characterized in that the inner wall of the SNCR reaction zone is provided with a single layer or a plurality of layers of first spray gun groups arranged along the vertical direction at intervals, and the inner wall of the horizontal section of the flue is provided with a single layer or a plurality of layers of second spray gun groups arranged along the horizontal direction at intervals. The system utilizes the escaped ammonia of the front SNCR reaction area as a reducing agent of the rear reaction area, the horizontal section turns to the indoor supplementary spray gun group, and the reducing agent ammonia water solution is supplemented under the condition that the ammonia escape of the reaction area is insufficient, so that the ammonia escape rate is effectively reduced. However, the system still does not solve the problems of insufficient mixing and low residence time of the SNCR reaction.
Patent document No. CN203862126U discloses an ammonia injection device for denitration in a four-corner tangential pulverized coal furnace, which comprises multiple layers of ammonia injection units arranged in the height direction of a flue, wherein each layer of ammonia injection unit comprises short guns arranged on the front wall and the side wall of the boiler and long guns arranged at four corners, and the long guns arranged at the four corners of the boiler are reversely cut with the direction of air flow in the boiler, so that the diffusion of ammonia gas in the boiler is strengthened, and the denitration efficiency of the boiler is improved. And the ammonia injection position of the system is close to the combustion area, the SNCR reaction is not in a high-efficiency interval, and the combustion efficiency of the boiler is greatly influenced.
Disclosure of Invention
In order to solve the defect that exists among the above-mentioned prior art, the utility model aims to provide a rotary vane formula SNCR denitration hybrid system for buggy stove makes the mixed reinforcing of flue gas and reductant, and the whole dwell time of flue gas increases, is in the time increase of best denitration temperature interval, improves SNCR denitration efficiency, reduces buggy stove SCR reactor denitration proportion, reduces catalyst volume, reduces the denitration running cost, can reduce the reductant escape simultaneously.
The utility model discloses a following technical scheme realizes:
the utility model discloses a rotary-vane SNCR denitration hybrid system for pulverized coal furnace, including boiler furnace, horizontal flue and afterbody flue, boiler furnace is equipped with the combustor, and boiler furnace upper portion is equipped with the first reductant injection point that is used for spraying the reductant to the flue gas, and the injection direction of first reductant injection point is parallel with horizontal flue, and horizontal flue top is equipped with the second reductant injection point that sprays the reductant to the flue gas, and the injection direction of second reductant injection point and horizontal flue are perpendicular; the horizontal flue is internally provided with a spiral sheet mixer, the spiral sheet mixer comprises a plurality of spiral sheets with the spiral flow number less than 0.6, and the spiral sheet mixer makes the flue gas flowing through the first reducing agent injection point and the second reducing agent injection point become weak spiral flow and then enters the tail flue.
Preferably, the rotary vane mixer comprises a frame, the frame is fixedly connected with the horizontal flue, and a plurality of rotary vanes are arranged in the frame in an array manner; the spiral pieces comprise a hollow circular tube and a plurality of spiral pieces, the spiral pieces are circumferentially and uniformly distributed on the outer wall of the hollow circular tube and are fixedly connected with the hollow circular tube, and the hollow circular tube is fixedly connected with the frame.
Further preferably, the outer diameter of the spiral piece is 2-3 times of the diameter of the hollow circular tube, and the length of the spiral piece along the axial direction is 1-2 times of the radius of the hollow circular tube.
Further preferably, the number of the spiral sheets of a single spiral sheet is 6-8.
Further preferably, the spiral sheet is hollow.
Preferably, the spiral sheet is distributed over the cross section of the horizontal flue.
Preferably, the first reducing agent injection point and the second reducing agent injection point comprise a plurality of spray guns arranged in multiple layers, the total number of spray guns C:
C＝W/Qsheet；
Wherein: w is the amount of consumption of reducing agent, QSheetThe injection quantity of a single spray gun;
number of spray guns C of first reducing agent injection point1: number of spray guns C of second reducing agent injection point2＝1:2。
Preferably, the first reducing agent injection point and the second reducing agent injection point are both connected with a reducing agent storage tank through pipelines, reducing agents are filled in the reducing agent storage tank, and the pipelines are provided with pumps.
Preferably, the reducing agent is ammonia or urea.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a rotary vane formula SNCR denitration hybrid system for buggy stove through set up the rotary vane blender that the rotary vane that is less than 0.6 by a plurality of swirl numbers in horizontal flue constitutes, makes and becomes weak whirl behind the rotary vane blender with the flue gas flow-through after the reductant that first reductant injection point and second reductant injection point erupted mixes, compares in strong whirl, and weak whirl has the flow field and stabilizes, does not have characteristics such as backward flow district or backward flow district are less. Under the action of the rotary vane, the mixing of the flue gas and the reducing agent is enhanced, and the contact probability of the reducing agent liquid drops and NOx and other molecules in the flue gas is improved. Meanwhile, due to the action of weak rotational flow, the integral retention time of the flue gas is prolonged, and the time of the flue gas in the optimal denitration temperature interval is prolonged. Therefore, the newly added rotary vane mixer can improve the SNCR denitration efficiency (which can be improved to 40% -50%). Further, the denitration proportion of the SCR reactor of the pulverized coal furnace can be reduced, the volume of the catalyst is reduced, and the denitration operation cost is reduced. Meanwhile, the escape of the reducing agent can be reduced, and the ash coke deposited on the subsequent tail heating surface is beneficial.
To buggy stove SNCR system generally be limited by degree of mixing and dwell time, SNCR denitration efficiency is lower, consequently, the utility model discloses a corresponding problem is solved to the vortex mixer based on the spinning disk of special design, and the fluid particle in the spinning disk not only takes place translation (or deformation) in the motion, and is rotary motion around the instantaneous axis of self moreover, has in the whirl promptly if the rotational velocity of liquid micelle is not 0 completely. The collision probability of the swirling flow bodies and the corresponding residence time are greatly increased, so that the swirling flow bodies can be used for strengthening mixing and improving the chemical reaction efficiency. The air flow with the swirl number less than 0.6 is called weak swirl, and compared with strong swirl, the air flow has the characteristics of stable flow field, no backflow region or small backflow region and the like. Because the heat exchange surface arranged on the flue at the tail part of the pulverized coal furnace needs to keep the flow field of the flue gas stable, the weak rotational flow is selected to play a role in strengthening the SNCR reaction and also ensure the stability of the subsequent flow field. The whirl can be produced by methods such as tangential air inlet, centrifugal wind channel usually, but to in the pulverized coal furnace flue, can reform transform the change space little, the utility model discloses a whirl blender by weak whirl piece constitution is placed in the flue, produces the whirl. The swirl number is a dimensionless number representing the strength of swirl, depends on the geometry of the rotor, and is independent of other external factors such as gas type, gas flow velocity and the like, and is defined as the ratio of axial angular momentum to the rate of change of axial momentum and the radius of a rough opening. In the process of designing the rotary vane structure, the cyclone number is taken as a final check index while the size of the flue is considered. To sum up, the utility model discloses a rotary vane formula SNCR denitration hybrid system for buggy stove can promote SNCR reaction efficiency by a relatively large margin, reduces the catalyst volume, reduces running cost and reductant escape.
Furthermore, the rotary vane mixer is formed by arranging and fixing a plurality of rotary vanes in a frame in an array manner, so that a mixing system of the flue gas and the reducing agent can be uniformly distributed and pass through the rotary vane mixer, and the efficiency is high.
Furthermore, the outer diameter and the axial length of the spiral piece are calculated according to the flue gas flow rate and the target rotational flow number (less than 0.6), the outer diameter of the spiral piece is usually set to be 2-3 times of the diameter of the hollow circular tube, and the axial length of the spiral piece is 1-2 times of the radius of the hollow circular tube, so that the optimal rotational flow number can be achieved.
Furthermore, the number of the spiral plates of a single spiral plate is 6-8, the most stable weak cyclone field can be generated, and the mixing effect is the best.
Furthermore, the rotary plate is fully distributed on the cross section of the horizontal flue, so that the passing flue gas can pass through the horizontal flue from each part, on one hand, omission is avoided, and on the other hand, the reaction efficiency is improved.
Furthermore, the rotary vane adopts a hollow structure, compared with a solid rotary vane, the resistance of the hollow weak rotary vane is lower, and when the flow rate of flue gas is below 15m/s, the resistance of the hollow rotary vane mixer is lower than 600 Pa.
Furthermore, the ratio of the number of spray guns of the first reducing agent injection point to the number of spray guns of the second reducing agent injection point is 1:2, the reducing agent of the first injection point is preliminarily mixed under the combined action of spray gun atomization and the flue gas flow field, and the rest reducing agent is injected at the second injection point and is fully mixed through a rotary vane mixer. The spraying in different areas can not only make full use of the flow field and the mixer to achieve high-efficiency mixing, but also increase the SNCR reaction residence time and utilize the effective temperature range to the maximum extent.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic structural view of a rotor mixer according to the present invention;
fig. 3 is a schematic structural view of the rotary vane of the present invention.
In the figure: 1 is a boiler hearth, 2 is a horizontal flue, 3 is a tail flue, 4 is a pump, 5 is a reducing agent storage tank, 6 is a burner, 7 is a second reducing agent injection point, 8 is a first reducing agent injection point, 9 is a spiral sheet mixer, 9-1 is a frame, 9-2 is a spiral sheet, 9-2-1 is a hollow circular tube, and 9-2-2 is a spiral sheet.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific examples, which are intended to illustrate and not to limit the invention:
as fig. 1, for the utility model discloses a rotary vane type SNCR denitration hybrid system for buggy stove, including boiler furnace 1, horizontal flue 2 and afterbody flue 3, boiler furnace 1 is equipped with combustor 6, and boiler furnace 1 upper portion is equipped with the first reductant injection point 8 that is arranged in spraying the reductant to the flue gas, and the injection direction of first reductant injection point 8 is parallel with horizontal flue 2, and horizontal flue 2 top is equipped with the second reductant injection point 7 that sprays the reductant to the flue gas, and the injection direction that second reductant injection point 7 and is perpendicular with horizontal flue 2; a spiral piece mixer 9 is arranged in the horizontal flue 2, the spiral piece mixer 9 comprises a frame 9-1 and a plurality of spiral pieces 9-2 with the spiral flow number smaller than 0.6, the frame 9-1 is fixedly connected with the horizontal flue 2, the cross sections of the frame 9-1 and the horizontal flue 2 are equal in size, the spiral pieces 9-2 are fully distributed on the cross section of the horizontal flue 2, and as shown in figure 2, the plurality of spiral pieces 9-2 are arranged in the frame 9-1 in an array manner; as shown in FIG. 3, only two flights 9-2-2 are shown 180 degrees apart to highlight the structure of flights 9-2-2; the spiral sheet 9-2 comprises a hollow circular tube 9-2-1 and a plurality of spiral sheets 9-2-2, the spiral sheets 9-2-2 are fixedly connected with the hollow circular tube 9-2-1, and the hollow circular tube 9-2-1 is fixedly connected with the frame 9-1. The outer diameter of the spiral sheet 9-2-2 is 2-3 times of the diameter of the hollow circular tube 9-2-1, and the length of the spiral sheet 9-2-2 in the radial direction is 1-2 times of the radius of the hollow circular tube 9-2-1. The number of the spiral pieces 9-2-2 provided with the single spiral piece 9-2 is 6-8, and the spiral pieces 9-2-2 are preferably hollow.
The first reducing agent injection point 8 and the second reducing agent injection point 7 comprise a plurality of spray guns which are arranged in a multilayer mode, the number of the spray guns is determined by the concentration of NOx contained in flue gas, the total ammonia-nitrogen ratio is 1.5-2, and the total number of the spray guns is C: c ═ W/QSheet(ii) a Wherein: w is the amount of consumption of reducing agent, QSheetThe injection quantity of a single spray gun; number of spray guns C of first reducing agent injection point 81: number of spray guns C of second reducing agent injection point 721: 2. The first reducing agent injection point 8 and the second reducing agent injection point 7 are both connected with a reducing agent storage tank 5 through pipelines, the reducing agent storage tank 5 is filled with a reducing agent which is ammonia or urea, and the pipelines are provided with pumps 4.
The single rotary vane 9-2 is limited by the processing precision, the diameter is generally less than 1m, and the number of the rotary vanes 9-2 can be calculated according to the rectangular cross section area of the horizontal flue 2. In an embodiment of the present invention, the spiral mixer 9 is composed of 15 spiral pieces 9-2, and is arranged in a 5 × 3 array, the hollow circular tube 9-2-1 is welded and fixed to the frame 9-1, 8 spiral pieces 9-2-2 are welded and fixed to the outer wall of the hollow circular tube 9-2-1 in the circumferential direction, the smoke cyclone passing through the spiral pieces 9-2 can expand, and the expansion area after the smoke cyclone is 9-16 times the area of the spiral pieces 9-2 itself, which has a good effect.
The utility model discloses a working method that is used for rotary vane formula SNCR denitration hybrid system of buggy stove, include:
after pulverized coal particles are sprayed into a boiler hearth 1 by a burner 6 to be combusted, generated smoke rises, is mixed with reducing agents sprayed from a first reducing agent injection point 8 and a second reducing agent injection point 7, then enters a spiral sheet mixer 9 arranged in a horizontal flue 2, becomes weak spiral flow under the action of a spiral sheet 9-2, and then enters a tail flue 3.
Effect verification:
adopt the mode that adds the spike particle in the laboratory, it is right the utility model discloses a 9 whirl effects of vortex sheet blender are studied and are adopted a plane to arrange 9 exports of vortex sheet blender in, then can discover on the even striking of spike particle is to the plane to become circular distribution, circular diameter's size depends on the distance and the air current velocity of flow that correspond plane and whirl blender export, and the result shows that the spike particle dispersion effect that corresponds weak whirl vortex sheet 9-2 exit is good, and even distribution is in the air current. The device is arranged in a horizontal flue 2 of a boiler, the flue gas and the reducing agent can be well mixed under the action of a spiral piece mixer 9, a stable weak spiral flow is formed, the consumption of the reducing agent is reduced, and the SNCR reaction effect is strengthened.
It should be noted that the above description is only one of the embodiments of the present invention, and all equivalent changes made by the system described in the present invention are included in the protection scope of the present invention. The technical field of the present invention can be replaced by other embodiments described in a similar manner, without departing from the structure of the present invention or exceeding the scope defined by the claims, which belong to the protection scope of the present invention.
Claims (9)
1. A rotary-vane SNCR denitration hybrid system for a pulverized coal furnace is characterized by comprising a boiler furnace (1), a horizontal flue (2) and a tail flue (3), wherein the boiler furnace (1) is provided with a burner (6), a first reducing agent injection point (8) for injecting a reducing agent into flue gas is arranged at the upper part of the boiler furnace (1), the injection direction of the first reducing agent injection point (8) is parallel to the horizontal flue (2), a second reducing agent injection point (7) for injecting the reducing agent into the flue gas is arranged at the top of the horizontal flue (2), and the injection direction of the second reducing agent injection point (7) is vertical to the horizontal flue (2); a spiral piece mixer (9) is arranged in the horizontal flue (2), the spiral piece mixer (9) comprises a plurality of spiral pieces (9-2) with the spiral flow number smaller than 0.6, and the spiral piece mixer (9) enables flue gas flowing through the first reducing agent injection point (8) and the second reducing agent injection point (7) to become weak spiral flow and then enter the tail flue (3).
2. The rotary vane type SNCR denitration mixing system for the pulverized coal furnace as claimed in claim 1, wherein the rotary vane mixer (9) comprises a frame (9-1), the frame (9-1) is fixedly connected with the horizontal flue (2), and a plurality of rotary vanes (9-2) are arranged in the frame (9-1) in an array manner; the spiral pieces (9-2) comprise hollow circular tubes (9-2-1) and a plurality of spiral pieces (9-2-2), the spiral pieces (9-2-2) are uniformly distributed on the outer walls of the hollow circular tubes (9-2-1) in the circumferential direction and fixedly connected with the hollow circular tubes (9-2-1), and the hollow circular tubes (9-2-1) are fixedly connected with the frame (9-1).
3. The rotary vane type SNCR denitration hybrid system for the pulverized coal furnace as claimed in claim 2, wherein the outer diameter of the spiral vane (9-2-2) is 2-3 times of the diameter of the hollow circular tube (9-2-1), and the axial length of the spiral vane (9-2-2) is 1-2 times of the radius of the hollow circular tube (9-2-1).
4. The rotary vane type SNCR denitration hybrid system for the pulverized coal furnace as claimed in claim 2, wherein the number of the spiral vanes (9-2-2) of a single rotary vane (9-2) is 6-8.
5. The rotary vane SNCR denitration hybrid system for pulverized coal furnaces as claimed in claim 2, wherein the spiral vanes (9-2-2) are hollow.
6. The rotary vane SNCR denitration hybrid system for pulverized coal furnaces as claimed in claim 1, wherein the rotary vanes (9-2) are distributed over the cross section of the horizontal flue (2).
7. The rotary vane SNCR denitration hybrid system for pulverized coal furnaces as claimed in claim 1, wherein the first reducing agent injection point (8) and the second reducing agent injection point (7) comprise a plurality of spray guns arranged in multiple layers, the total number of spray guns C:
C＝W/Qsheet；
Wherein: w is the amount of consumption of reducing agent, QSheetThe injection quantity of a single spray gun;
number of spray guns C of first reducing agent injection point (8)1: number of spray guns C of second reducing agent injection point (7)2＝1:2。
8. The rotary vane type SNCR denitration hybrid system for a pulverized coal furnace as claimed in claim 1, wherein the first reducing agent injection point (8) and the second reducing agent injection point (7) are both connected with a reducing agent storage tank (5) through a pipeline, a reducing agent is filled in the reducing agent storage tank (5), and a pump (4) is arranged on the pipeline.
9. The rotary vane SNCR denitration hybrid system for a pulverized coal furnace as claimed in claim 1, wherein the reducing agent is ammonia or urea.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112370962A (en) * | 2020-10-16 | 2021-02-19 | 山东德曦环境科技有限公司 | SNCR or SCR denitration and VOCs collaborative pyrolysis treatment device and process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112370962A (en) * | 2020-10-16 | 2021-02-19 | 山东德曦环境科技有限公司 | SNCR or SCR denitration and VOCs collaborative pyrolysis treatment device and process |
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