CN216321088U - Flue full-circle type reaction working medium injection system suitable for SNCR (selective non-catalytic reduction) of circulating fluidized bed boiler - Google Patents
Flue full-circle type reaction working medium injection system suitable for SNCR (selective non-catalytic reduction) of circulating fluidized bed boiler Download PDFInfo
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- CN216321088U CN216321088U CN202121479779.1U CN202121479779U CN216321088U CN 216321088 U CN216321088 U CN 216321088U CN 202121479779 U CN202121479779 U CN 202121479779U CN 216321088 U CN216321088 U CN 216321088U
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Abstract
The utility model discloses a flue full-circumference type reaction working medium injection system suitable for SNCR (selective non-catalytic reduction) of a circulating fluidized bed boiler, which comprises an annular injection system, a plurality of spray guns and a plurality of spray guns, wherein the annular injection system is circumferentially arranged around a horizontal flue and comprises an annular pipe and a plurality of spray guns, the annular pipe is circumferentially arranged around the horizontal flue; the annular pipe is provided with an inlet for introducing a reaction working medium; the plurality of spray guns are sequentially arranged around the circumferential direction of the annular pipe, and nozzles of the spray guns face the horizontal flue; the number of the spray guns at the bottom of the horizontal flue is larger than that at the bottom of the horizontal flue, and the number of the spray guns at the outer side of the horizontal flue is larger than that at the inner side of the horizontal flue. The injection quantity of the reaction working medium on the outer side is high, and the reaction working medium is matched with the flow field in the cyclone separator, so that the reaction time of denitration is prolonged, the denitration efficiency is improved, and the reaction working medium is saved; the number of spray guns arranged at the bottom of the horizontal flue is small, so that the problem of spray gun blockage caused by dust deposition is reduced.
Description
Technical Field
The utility model belongs to the technical field of flue gas denitration of circulating fluidized bed boilers, and particularly relates to a flue full-circle type reaction working medium injection system suitable for SNCR (selective non-catalytic reduction) of a circulating fluidized bed boiler.
Background
The flue gas discharged by the traditional large-scale circulating fluidized bed boiler often contains a large amount of NOx, and with the increasing attention of the nation and the society on environmental protection, the SNCR denitration technology has the characteristics of simple process and high denitration rate, and is very widely applied to flue gas treatment. The SNCR technology using urea solution as reaction working medium arranges a plurality of spray guns in the flue, and sprays the urea solution into the flue gas, so that NOx at high temperature reacts with the urea solution to generate nontoxic and harmless nitrogen.
The following problems in large circulating fluidized bed boiler applications are easily overlooked: on one hand, the traditional spray gun arrangement structure is that the two sides of a horizontal flue are equidistant and equal in quantity, the sprayed urea solution is basically consistent in distribution on the two sides of the flue and enters a cyclone separator in less than 0.5 second in the horizontal flue, the urea solution is greatly influenced by the action of inertia force relative to flue gas, the concentration of the urea solution on the outer side and the concentration of the urea solution on the inner side of the separator are basically consistent, but because the flue gas on the outer side of the cyclone separator is high in flow velocity and the flue gas on the inner side is low in flow velocity, the urea solution is insufficient in a region with high flue gas flow velocity on the outer side, and the urea solution is excessive in a region with low flue gas flow velocity on the inner side; on the other hand, as the fly ash is often mixed in the flue gas, sometimes the bottom of the horizontal flue can generate dust deposition, but the traditional spray gun is arranged at the position close to the bottom of the flue and is also horizontal, so that the problem of spray gun blockage is easily generated. These problems have both reduced denitration efficiency, have wasted reaction working medium again, can also influence normal unit denitration system operation because the spray gun blocks up sometimes.
Disclosure of Invention
Based on the problems, the utility model provides a flue full-circumference type reaction working medium injection system suitable for SNCR of a circulating fluidized bed boiler, and solves the problems that the traditional spray gun is not arranged at a good position, so that the reaction working medium in a cyclone separator is uneven, and the spray gun is easy to block.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the flue full-circumference type reaction working medium injection system suitable for the SNCR of the circulating fluidized bed boiler comprises an annular injection system which is circumferentially arranged around a horizontal flue, wherein the annular injection system comprises an annular pipe which is circumferentially arranged around the horizontal flue and a plurality of spray guns which are connected to the annular pipe; the annular pipe is provided with an inlet for introducing a reaction working medium; the spray guns are sequentially arranged around the circumferential direction of the annular pipe, and nozzles of the spray guns face the horizontal flue; the number of the spray guns at the top of the horizontal flue is larger than that at the bottom of the horizontal flue, and the number of the spray guns at the outer side of the horizontal flue is larger than that at the inner side of the horizontal flue.
Preferably, the spray guns on the outermost edge of the inner side of the horizontal flue incline towards the central part of the horizontal flue, and the spray guns in the middle of the inner side of the horizontal flue are denser than the spray guns at the edge.
More preferably, the included angle between the spray gun at the edge of the inner side of the horizontal flue and the bottom surface of the horizontal flue is 10-15 degrees.
Preferably, the spray guns on the outermost edge of the outer side of the horizontal flue incline towards the central part of the horizontal flue, and the spray guns in the middle of the outer side of the horizontal flue are denser than the spray guns at the edge.
More preferably, the included angle between the spray gun at the outermost edge of the outer side of the horizontal flue and the bottom surface of the horizontal flue is 10-15 degrees.
Preferably, the arrangement positions of the spray guns on the outer side of the horizontal flue and the arrangement positions of the spray guns on the inner side of the horizontal flue are distributed in a staggered manner.
Preferably, the ratio of the injection amount of the reaction working medium at the outer side of the horizontal flue to the injection amount of the reaction working medium at the inner side of the horizontal flue is 5: 3.
preferably, the arrangement positions of the spray guns at the bottom of the horizontal flue and the arrangement positions of the spray guns at the top of the horizontal flue are distributed in a staggered manner.
Preferably, a plurality of annular injection systems are sequentially arranged along the axial direction of the horizontal flue, the inlet of the annular pipe of each annular injection system is connected with a branch pipe, all the branch pipes are communicated through a main pipe, and valves are arranged on the branch pipes.
Compared with the prior art, the utility model has the beneficial effects that:
(1) the number of the spray guns on the outer side of the horizontal flue of the annular injection system is larger than that of the spray guns on the inner side of the horizontal flue, so that the reaction working medium on the outer side of the horizontal flue is more and less, the injection quantity of the reaction working medium on the outer side is high, and the reaction working medium is matched with a flow field in a cyclone separator, so that the reaction time of denitration is prolonged, the denitration efficiency is improved, and the reaction working medium is saved; the number of spray guns arranged at the bottom of the horizontal flue is small, so that the problem of spray gun blockage caused by dust deposition is reduced.
(2) According to the utility model, the main pipe is connected with the plurality of annular injection systems in parallel, and when the annular injection systems in operation are seriously blocked, the switching of different annular injection systems can be realized by switching the on and off of the valve, so that the continuous normal operation of the denitration system under special conditions is ensured.
Other advantages of the utility model are detailed in the detailed description of the embodiments.
Drawings
Fig. 1 is a schematic diagram of the arrangement of the injection system on the horizontal flue according to the embodiment of the utility model.
Fig. 2 is a side view of fig. 1.
Fig. 3 is a sectional view taken along line a-a of fig. 2.
Fig. 4 is a top view of fig. 1.
The various reference numbers in the figures illustrate:
1-annular injection system, 2-horizontal flue, 3-branch pipe, 4-main pipe, 5-valve, 6-cyclone separator and 7-hearth;
11-annular pipe, 12-spray gun;
21-the top of the horizontal flue, 22-the bottom of the horizontal flue, 23-the outer side of the horizontal flue and 24-the inner side of the horizontal flue.
Detailed Description
In the present invention, the inside 24 of the horizontal flue means a side closer to the central axis of the cyclone, and the outside 23 of the horizontal flue means a side farther from the central axis of the cyclone.
Specific examples of the present invention are given below. It should be noted that, in the following description, unless explicitly stated or limited otherwise, terms such as "disposed" and "connected" are to be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrated; either a direct connection or an indirect connection, and the like. The specific meaning of the above terms in the present technical solution can be understood by those of ordinary skill in the art according to specific situations.
In the present invention, unless otherwise specified, the use of the terms of orientation such as "upper" and "lower" generally means that they are defined with reference to the drawing plane of the corresponding drawing, and "inner" and "outer" means that they are defined with reference to the outline of the corresponding drawing.
The individual features described in the following embodiments can be combined in any suitable manner without departing from the inventive idea, which should also be regarded as disclosed in the present application.
The embodiment of the utility model discloses a flue full-circumference type reaction working medium injection system suitable for SNCR (selective non-catalytic reduction) of a circulating fluidized bed boiler, and as shown in figure 1, the injection system of the embodiment comprises an annular injection system 1 which is circumferentially arranged around a horizontal flue 2.
The number of the annular injection systems 1 can be 1, and a plurality of annular injection systems 1, 2 in the embodiment, can also be sequentially arranged along the axial direction of the horizontal flue 2. A plurality of annular injection system 1 are connected in parallel on female pipe 4 through branch pipe 3 to be provided with valve 5 on branch pipe 3, when the annular injection system 1 of commissioning appears the circumstances such as serious jam, through the switch of switching valve 5, can realize the switching of different annular injection system 1, the continuous normal operating of deNOx systems under the guarantee special circumstances.
The cross section of the horizontal flue 2 of this embodiment is the rectangle, and the flue that uses in the power plant at present all is the rectangular cross section, has a few polygon cross sections that adopt, and to the polygon flue, the setting position of spray gun 12 is the same with this embodiment, still sets up according to top and bottom, inboard and outside difference.
The annular injection system 1 comprises an annular pipe 11 and a plurality of spray guns 12, wherein the annular pipe 11 is circumferentially arranged around the horizontal flue 2, and the annular pipe 11 is provided with an inlet (not marked in the figure) for introducing a reaction working medium; in this embodiment, the inlet of the ring pipe 11 is connected to the branch pipe 3. A plurality of spray guns 12 are connected to the inner side of the ring pipe 11 for spraying urea into the horizontal flue, and the nozzle ends of the spray guns 12 are inserted into the horizontal flue 2. The spray gun 12 adopted in the embodiment is a commercially available common spray gun, and the reaction working medium in the embodiment is urea solution.
A plurality of spray guns 12 are arranged in sequence around the circumferential direction of the annular pipe 11, and the nozzles of the spray guns 12 face the horizontal flue 2. The spray guns 12 on the inner side and the outer side of the horizontal flue are not arranged at equal intervals, the number of the spray guns 12 on the top 21 of the horizontal flue is larger than that of the spray guns on the bottom 22 of the horizontal flue, and the blockage of the spray guns on the bottom of the horizontal flue due to the easy dust accumulation is reduced.
As the preferred scheme, the spray guns 12 at the bottom 22 of the horizontal flue and the spray guns 12 at the top 21 of the horizontal flue are arranged in a staggered mode, so that the mixing area is increased, the blind area is reduced, and the overlarge concentration deviation at different height positions is avoided.
The number of lances 12 outside the horizontal tunnel 23 is greater than the number of lances 12 inside the horizontal tunnel 24. The flue gas enters the cyclone separator 6 in less than 0.5 second from the horizontal flue 2, the reaction working medium is influenced greatly by the action of inertia force relative to the flue gas, the flue gas flow velocity outside the cyclone separator 6 is high, the flue gas flow velocity inside the cyclone separator is low, therefore, the number of the spray guns 12 on the outer side 23 of the horizontal flue is greater than that of the spray guns on the inner side 24 of the horizontal flue, the reaction working medium outside the horizontal flue 2 is more, the inner side is less, the reaction working medium is high in ejection quantity on the outer side and is matched with the flow field in the cyclone separator 6, and the problems that the reaction working medium in the region is insufficient due to the high flue gas flow velocity outside the horizontal flue 23 and the reaction working medium in the region is excessive due to the low flue gas flow velocity inside the horizontal flue 24 are avoided.
Preferably, the ratio of the injection quantity of the reaction working medium at the outer side 23 of the horizontal flue to the injection quantity of the reaction working medium at the inner side 24 of the horizontal flue is 5: 3, the denitration efficiency is improved, and meanwhile, the reaction working medium is saved.
Preferably, the spray gun 12 at the most edge of the inner side 24 of the horizontal flue inclines towards the central part of the horizontal flue 2, and the specific inclination angle is as follows: the included angle between the spray gun 12 at the edge of the inner side 24 of the horizontal flue and the bottom surface of the horizontal flue 2 is 10-15 degrees. In addition, the spray guns 12 in the middle of the horizontal flue inner side 24 are denser than the spray guns 12 at the edges, i.e. the adjacent spray guns 12 in the middle are spaced less than the adjacent spray guns 12 at the edges. Through the embodiment, on one hand, the coverage area of the reaction working medium in the horizontal flue 2 is increased, and on the other hand, the problem of spray gun blockage caused by dust deposition is reduced.
Preferably, in the same way as the arrangement of the spray guns 12 on the inner side 24 of the horizontal flue, the spray guns 12 on the outermost edge of the outer side 23 of the horizontal flue incline towards the central part of the horizontal flue 2, and the specific inclination angle is as follows: the included angle between the spray gun 12 at the outermost edge of the outer side 23 of the horizontal flue and the bottom surface of the horizontal flue 2 is 10-15 degrees. In addition, the spray guns 12 in the middle of the outer side 23 of the horizontal flue are denser than the spray guns 12 at the edge, namely, the distance between the adjacent spray guns 12 in the middle of the outer side 23 of the horizontal flue is smaller than that between the adjacent spray guns 12 at the edge. Similarly, through the embodiment, on one hand, the coverage area of the reaction working medium in the horizontal flue 2 is increased, and on the other hand, the problem of spray gun blockage caused by dust deposition is reduced.
Preferably, the arrangement positions of the spray guns 12 at the bottom 22 of the horizontal flue and the arrangement positions of the spray guns at the top 21 of the horizontal flue are distributed in a staggered way; similarly, the arrangement positions of the spray guns 12 on the outer side 23 of the horizontal flue and the arrangement positions of the spray guns 12 on the inner side 24 of the horizontal flue are distributed in a staggered manner. Therefore, the mixing area of the reaction working medium can be increased, the blind area can be reduced, and the overlarge concentration deviation of different height positions can be avoided.
The annular pipe 11, the spray gun 12, the branch pipe 3, the main pipe 4 and the like of the embodiment of the utility model are all made of high-temperature-resistant stainless steel materials, and can keep high strength, corrosion resistance and high wear resistance in a high-temperature flue gas environment.
The working principle of the flue full-circle reaction working medium injection system described in the above embodiment is as follows:
when the circulating fluidized bed boiler normally operates, the flue gas enters the cyclone separator 3 from the hearth 7 of the circulating fluidized bed boiler along the horizontal flue 2, one part of the flue gas in the cyclone separator 3 enters the tail flue, and the other part of the flue gas enters the hearth 7 again along the bottom flue; the reaction working medium enters an annular pipe 11 of the annular injection system 1 from a main pipe 4 through a branch pipe 3, is injected 12 into a horizontal flue 2 through a spray gun, and performs denitration reaction with flue gas in the subsequent flue and a cyclone separator 3;
when the annular injection system 1 in operation is seriously blocked, the other annular injection system 1 is opened by switching the switch of the valve 5, so that the continuous normal operation of the denitration system under special conditions is ensured.
Claims (9)
1. The flue full-circumference type reaction working medium injection system suitable for the SNCR of the circulating fluidized bed boiler is characterized by comprising an annular injection system (1) which is circumferentially arranged around a horizontal flue (2), wherein the annular injection system (1) comprises an annular pipe (11) which is circumferentially arranged around the horizontal flue (2) and a plurality of spray guns (12) which are connected to the annular pipe (11);
an inlet for introducing a reaction working medium is formed in the annular pipe (11);
the spray guns (12) are sequentially arranged around the circumferential direction of the annular pipe (11), and nozzles of the spray guns (12) face the inside of the horizontal flue (2);
the number of the spray guns (12) at the top (21) of the horizontal flue is larger than that at the bottom (22) of the horizontal flue, and the number of the spray guns (12) at the outer side (23) of the horizontal flue is larger than that at the inner side (24) of the horizontal flue.
2. Flue full-circumference reaction medium injection system suitable for SNCR of a circulating fluidized bed boiler, according to claim 1, characterized in that the outermost lances (12) of the inner side (24) of the horizontal flue are inclined towards the central part of the horizontal flue (2) and the lances (12) in the middle of the inner side (24) of the horizontal flue are denser than the lances (12) at the edge.
3. The flue full-circumference type reaction working medium injection system suitable for the SNCR of the circulating fluidized bed boiler in claim 2, wherein the included angle between the spray gun (12) at the outermost edge of the inner side (24) of the horizontal flue and the bottom surface of the horizontal flue (2) is 10-15 degrees.
4. Flue full-circumference reaction medium injection system suitable for SNCR of a circulating fluidized bed boiler, according to claim 1, characterized in that the outermost lances (12) outside the horizontal flue (23) are inclined towards the center of the horizontal flue (2) and the lances (12) in the middle of the outside (23) of the horizontal flue are denser than the lances (12) at the edges.
5. The flue full-circumference type reaction working medium injection system suitable for the SNCR of the circulating fluidized bed boiler is characterized in that the included angle between the spray gun (12) at the outermost edge of the outer side (23) of the horizontal flue and the bottom surface of the horizontal flue (2) is 10-15 degrees.
6. Flue full-circumference reaction medium injection system suitable for SNCR of a circulating fluidized bed boiler, according to claim 1, characterized in that the arrangement positions of the spray guns (12) outside the horizontal flue (23) are staggered with the arrangement positions of the spray guns (12) inside the horizontal flue (24).
7. The flue full-circumference type reaction medium injection system suitable for SNCR of a circulating fluidized bed boiler, as recited in claim 1, characterized in that the ratio of the injection amount of the reaction medium outside the horizontal flue (23) to the injection amount of the reaction medium inside the horizontal flue (24) is 5: 3.
8. flue full-circumference reaction medium injection system suitable for SNCR of a circulating fluidized bed boiler, according to claim 1, characterized in that the arrangement positions of the spray guns (12) at the bottom (22) of the horizontal flue and the arrangement positions of the spray guns at the top (21) of the horizontal flue are staggered.
9. The flue full-circumference type reaction working medium injection system suitable for the SNCR of the circulating fluidized bed boiler is characterized in that a plurality of annular injection systems (1) are sequentially arranged along the axial direction of a horizontal flue (2), the inlet of an annular pipe (11) of each annular injection system (1) is connected with a branch pipe (3), all the branch pipes (3) are communicated through a main pipe (4), and valves (5) are arranged on the branch pipes (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121479779.1U CN216321088U (en) | 2021-06-30 | 2021-06-30 | Flue full-circle type reaction working medium injection system suitable for SNCR (selective non-catalytic reduction) of circulating fluidized bed boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121479779.1U CN216321088U (en) | 2021-06-30 | 2021-06-30 | Flue full-circle type reaction working medium injection system suitable for SNCR (selective non-catalytic reduction) of circulating fluidized bed boiler |
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| CN216321088U true CN216321088U (en) | 2022-04-19 |
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| CN202121479779.1U Active CN216321088U (en) | 2021-06-30 | 2021-06-30 | Flue full-circle type reaction working medium injection system suitable for SNCR (selective non-catalytic reduction) of circulating fluidized bed boiler |
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