CN102908920B - Ammonia and air mixer for denitrification device - Google Patents
Ammonia and air mixer for denitrification device Download PDFInfo
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Abstract
The invention discloses an ammonia and air mixer for a denitrification device, comprising an ammonia injection pipeline (3), an ammonia injection nozzle (4), a turbulent flow bluff body (5), a cylinder body (6), a retracting pipe (7), a mixing pipe (8) and a diffuser pipe (9), wherein the cylinder body (6) is sequentially connected with the retracting pipe (7), the mixing pipe (8) and the diffuser pipe (9); the cylinder body (6) is internally provided with the ammonia injection pipeline (3); the ammonia injection nozzle (4) is arranged at the tail end of the ammonia injection pipeline (3); and the turbulent flow bluff body (5) is arranged in front of the ammonia injection nozzle (4). The ammonia and air mixer can uniformly distribute air, prevents gas collection, effectively prevents a water hammer phenomenon and prevents a membrane shell from being burst, and has the advantage of good washing effect.
Description
Technical field
The present invention relates to the blender of a kind of ammonia and air, particularly a kind of ammonia for denitrification apparatus, air mixer.
Background technology
In recent years, along with the quick growth of China's energy-consuming, exhaust nitrogen oxides content rises rapidly.How nitrogen oxide, as one of main atmosphere pollution, effectively controls its discharge, has become the hot subject of current field of Environment Protection.Wherein, SCR (SelectiveCatalytic Reduction is called for short SCR) is as a kind of important means of effective control discharged nitrous oxides, and because its denitration efficiency is high, the features such as technical maturity are widely used.SCR technology is under the effect of catalyst, utilizes reducing agent (liquefied ammonia etc.) to generate nitrogen and water with the reaction of nitrogen oxides in flue gas, thus removes the technology of nitrogen oxide.
Liquefied ammonia, as denitration raw material important in SCR technology, before injection SCR reactor, through evaporimeter gasification, sprays into SCR reactor with air after mixing by a certain percentage in a mixer.Therefore, the mixed effect of ammonia air mixer directly governs stability and the high efficiency of flue gas denitrification system work.
Current ammonia air mixer is mainly venturi mixer, the patent No. is that the Chinese invention patent of ZL201120067465.0 discloses a kind of ammonia, air Venturi mixer, the cylindrical shell that it comprises Venturi tube and is attached thereto, in Venturi tube, import department is provided with nozzle.Current this ammonia, air Venturi mixer are widely adopted, but find in actual applications, and this blender mixed effect is poor, and crushing is larger.
Summary of the invention
The object of the invention is to, provide a kind of ammonia for denitrification apparatus, air mixer, it is simple that it has structure, the advantage that ammonia, air good mixing effect and the pressure loss are little.
Technical scheme of the present invention: a kind of ammonia for denitrification apparatus, air mixer, comprise the incident pipeline of ammonia, ammonia incident nozzle, flow-disturbing bluff body, cylindrical shell, collapsible tube, mixing tube and diffuser pipe, cylindrical shell connects collapsible tube, mixing tube and diffuser pipe successively, the incident pipeline of ammonia is provided with in cylindrical shell, the incident nozzle of ammonia is located at the tail end of the incident pipeline of ammonia, and the dead ahead of the incident nozzle of ammonia is provided with flow-disturbing bluff body.
In the aforesaid this ammonia for denitrification apparatus, air mixer, the end of cylindrical shell is provided with air intake flange, and the end of the incident pipeline of ammonia is provided with ammonia inlet flange, and the afterbody of diffuser pipe is provided with mixed gas outlet flange.
In the aforesaid this ammonia for denitrification apparatus, air mixer, the distance on the right side of mixed gas outlet flange and diffuser pipe is 1m ~ 2m.
In the aforesaid this ammonia for denitrification apparatus, air mixer, the distance between flow-disturbing bluff body and the incident nozzle of ammonia is 25 ~ 35mm.
In the aforesaid this ammonia for denitrification apparatus, air mixer, flow-disturbing bluff body is the angle of bus and axle is 30 ° ~ 60 °, and bus length is the cone of 60mm ~ 180mm.
In the aforesaid this ammonia for denitrification apparatus, air mixer, flow-disturbing bluff body is the angle of bus and axle is 45 °, and bus length is the cone of 120mm.
In the aforesaid this ammonia for denitrification apparatus, air mixer, the incident pipeline of ammonia is made up of horizontal pipe and vertical pipe, and the axis of horizontal pipe overlaps with the axis of cylindrical shell, and vertical pipe is through cylindrical shell.
In the aforesaid this ammonia for denitrification apparatus, air mixer, collapsible tube and diffuser pipe are varying cross-section duct.
In the aforesaid this ammonia for denitrification apparatus, air mixer, the diameter of cylindrical shell is 200mm ~ 300mm, and the diameter of mixing tube is 100mm ~ 300mm, and the length of collapsible tube is 200mm ~ 300mm, and the length of diffuser pipe is 500mm ~ 600mm.
In the aforesaid this ammonia for denitrification apparatus, air mixer, the diameter of cylindrical shell is 250mm, and the diameter of mixing tube is 200mm, and the length of collapsible tube is 250mm, and the length of diffuser pipe is 550mm.
Compared with prior art, because the present invention is provided with flow-disturbing bluff body in cylindrical shell, expand the contact area of ammonia and air, ammonia is mixed with air more even.In addition due to through great many of experiments and Data Comparison, finally obtain the optimum size of each parts, thus solve the larger problem of prior art blender crushing.
Adopt existing venturi mixer, ammonia can form one long and narrow ammonia air-flow after nozzle, after this strand of air-flow mixes with air draught, existence due to larger velocity gradient is difficult to be merged by air draught, unless ammonia forms atomized spray after nozzle ejection, but is also virtually adding complexity and the difficulty of processing of nozzle.On the contrary, if structure of the present invention, as can be seen from Fig. 2 and Fig. 4, long and narrow ammonia air-flow is broken up along bluff body surface, effectively prevents air accumulation, in short distance, reduces current rate, enhance the mixing of two strands of air-flows.Meanwhile, traditional venturi mixer requires sufficiently long distance will be had just to reach the requirement of mixing uniformity on the right side of mixed gas outlet flange and diffuser pipe, as long as but just can reach mixing requirement in the present invention's short distance.
Can find out that ammonia density index of the present invention meets the relevant regulations of country in addition from Fig. 3 and Fig. 5.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is ammonia and the mixed cross-sectional view of air in embodiment 2;
Fig. 3 is that in embodiment 2, ammonia mixes rear cross section and outlet ammonia molar concentration distribution map with air;
Fig. 4 is ammonia and the mixed cross-sectional view of air in embodiment 3;
Fig. 5 is that in embodiment 3, ammonia mixes rear cross section and outlet ammonia molar concentration distribution map with air.
Being labeled as in accompanying drawing: 1-air intake flange, 2-ammonia inlet flange, the incident pipeline of 3-ammonia, the incident nozzle of 4-ammonia, 5-flow-disturbing bluff body, 6-cylindrical shell, 7-collapsible tube, 8-mixing tube, 9-diffuser pipe, 10-mixed gas outlet flange.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail, but not as foundation the present invention being done to any restriction.
Embodiments of the invention 1: as shown in Figure 1, a kind of ammonia for denitrification apparatus, air mixer, comprise the incident pipeline 3 of ammonia, ammonia incident nozzle 4, flow-disturbing bluff body 5, cylindrical shell 6, collapsible tube 7, mixing tube 8 and diffuser pipe 9, cylindrical shell 6 connects collapsible tube 7, mixing tube 8 and diffuser pipe 9 successively, the incident pipeline 3 of ammonia is provided with in cylindrical shell 6, the incident nozzle 4 of ammonia is located at the tail end of the incident pipeline 3 of ammonia, and the dead ahead of the incident nozzle 4 of ammonia is provided with flow-disturbing bluff body 5.The end of cylindrical shell 6 is provided with air intake flange 1, and the end of the incident pipeline 3 of ammonia is provided with ammonia inlet flange 2, and the afterbody of diffuser pipe 9 is provided with mixed gas outlet flange 10.
Mixed gas outlet flange 10 is 1m with the distance on the right side of diffuser pipe, and the distance between flow-disturbing bluff body 5 and the incident nozzle 4 of ammonia is 25mm.Flow-disturbing bluff body 5 is the angle of bus and axle is 30 °, and bus length is the cone of 180mm.
The incident pipeline 3 of ammonia is made up of horizontal pipe and vertical pipe, and the axis of horizontal pipe overlaps with the axis of cylindrical shell 6, and vertical pipe is through cylindrical shell 6.Collapsible tube 7 and diffuser pipe 9 are varying cross-section duct.
The diameter of cylindrical shell 6 is 200mm, and the diameter of mixing tube 8 is 100mm, and the length of collapsible tube 7 is 200mm, and the length of diffuser pipe 9 is 500mm.
Embodiments of the invention 2: as shown in Figure 1, a kind of ammonia for denitrification apparatus, air mixer, comprise the incident pipeline 3 of ammonia, ammonia incident nozzle 4, flow-disturbing bluff body 5, cylindrical shell 6, collapsible tube 7, mixing tube 8 and diffuser pipe 9, cylindrical shell 6 connects collapsible tube 7, mixing tube 8 and diffuser pipe 9 successively, the incident pipeline 3 of ammonia is provided with in cylindrical shell 6, the incident nozzle 4 of ammonia is located at the tail end of the incident pipeline 3 of ammonia, and the dead ahead of the incident nozzle 4 of ammonia is provided with flow-disturbing bluff body 5.
The end of cylindrical shell 6 is provided with air intake flange 1, and the end of the incident pipeline 3 of ammonia is provided with ammonia inlet flange 2, and the afterbody of diffuser pipe 9 is provided with mixed gas outlet flange 10.
Mixed gaseous mixture outlet(discharge) flange 10 is 1.5m with the distance on the right side of diffuser pipe; Distance between flow-disturbing bluff body 5 and the incident nozzle 4 of ammonia is 30mm.
Flow-disturbing bluff body 5 is the angle of bus and axle is 45 °, and bus length is the cone of 70mm.
The incident pipeline 3 of ammonia is made up of horizontal pipe and vertical pipe, and the axis of horizontal pipe overlaps with the axis of cylindrical shell 6, and vertical pipe is through cylindrical shell 6.Collapsible tube 7 and diffuser pipe 9 are varying cross-section duct.
The diameter of cylindrical shell 6 is 200mm, and the diameter of mixing tube 8 is 150mm, and the length of collapsible tube 7 is 200mm, and the length of diffuser pipe 9 is 550mm.
Ammonia inlet flow rate is 0.0179kg/s, and air intake flow is 0.6745kg/s, and temperature is normal temperature.After blender mixing of the present invention, outlet ammonia molar concentration relative deviation is 4.3%, is less than 5%; The pressure loss is 244Pa, is less than 300Pa.The present embodiment is applicable to 300MW thermal power generation unit denitrification apparatus.Fig. 2 is the present embodiment ammonia and the mixed cross-sectional view of air; Cross section and outlet ammonia molar concentration distribution map after Fig. 3 the present embodiment ammonia mixes with air.
Embodiments of the invention 3: as shown in Figure 1, a kind of ammonia for denitrification apparatus, air mixer, comprise the incident pipeline 3 of ammonia, ammonia incident nozzle 4, flow-disturbing bluff body 5, cylindrical shell 6, collapsible tube 7, mixing tube 8 and diffuser pipe 9, cylindrical shell 6 connects collapsible tube 7, mixing tube 8 and diffuser pipe 9 successively, the incident pipeline 3 of ammonia is provided with in cylindrical shell 6, the incident nozzle 4 of ammonia is located at the tail end of the incident pipeline 3 of ammonia, and the dead ahead of the incident nozzle 4 of ammonia is provided with flow-disturbing bluff body 5.
The end of cylindrical shell 6 is provided with air intake flange 1, and the end of the incident pipeline 3 of ammonia is provided with ammonia inlet flange 2, and the afterbody of diffuser pipe 9 is provided with mixed gas outlet flange 10.
Mixed gas outlet flange 10 is 2m with the distance on the right side of diffuser pipe; Distance between flow-disturbing bluff body 5 and the incident nozzle 4 of ammonia is 30mm.
Flow-disturbing bluff body 5 is the angle of bus and axle is 45 °, and bus length is the cone of 160mm.
The incident pipeline 3 of ammonia is made up of horizontal pipe and vertical pipe, and the axis of horizontal pipe overlaps with the axis of cylindrical shell 6, and vertical pipe is through cylindrical shell 6.Collapsible tube 7 and diffuser pipe 9 are varying cross-section duct.
The diameter of cylindrical shell 6 is 350mm, and the diameter of mixing tube 8 is 200mm, and the length of collapsible tube 7 is 300mm, and the length of diffuser pipe 9 is 600mm.
Ammonia inlet flow rate is 0.0419kg/s, and air intake flow is 1.712kg/s, and temperature is normal temperature.After the present invention's mixing, outlet ammonia molar concentration relative deviation is 3.87%, is less than 5%; The pressure loss is 298Pa, is less than 300Pa.The present embodiment is applicable to 600MW thermal power generation unit denitrification apparatus.Fig. 4 is the present embodiment ammonia and the mixed cross section of air; Cross section and outlet ammonia molar concentration distribution map after Fig. 5 the present embodiment ammonia mixes with air.
Embodiments of the invention 4: as shown in Figure 1, a kind of ammonia for denitrification apparatus, air mixer, comprise the incident pipeline 3 of ammonia, ammonia incident nozzle 4, flow-disturbing bluff body 5, cylindrical shell 6, collapsible tube 7, mixing tube 8 and diffuser pipe 9, cylindrical shell 6 connects collapsible tube 7, mixing tube 8 and diffuser pipe 9 successively, the incident pipeline 3 of ammonia is provided with in cylindrical shell 6, the incident nozzle 4 of ammonia is located at the tail end of the incident pipeline 3 of ammonia, and the dead ahead of the incident nozzle 4 of ammonia is provided with flow-disturbing bluff body 5.
The end of cylindrical shell 6 is provided with air intake flange 1, and the end of the incident pipeline 3 of ammonia is provided with ammonia inlet flange 2, and the afterbody of diffuser pipe 9 is provided with mixed gas outlet flange 10.
Mixed gas outlet flange 10 is 1.5m with the distance on the right side of diffuser pipe; Distance between flow-disturbing bluff body 5 and the incident nozzle 4 of ammonia is 30mm.
Flow-disturbing bluff body 5 is the angle of bus and axle is 45 °, and bus length is the cone of 60mm.
The incident pipeline 3 of ammonia is made up of horizontal pipe and vertical pipe, and the axis of horizontal pipe overlaps with the axis of cylindrical shell 6, and vertical pipe is through cylindrical shell 6.Collapsible tube 7 and diffuser pipe 9 are varying cross-section duct.
The diameter of cylindrical shell 6 is 250mm, and the diameter of mixing tube 8 is 200mm, and the length of collapsible tube 7 is 250mm, and the length of diffuser pipe 9 is 550mm.
Embodiments of the invention 5: as shown in Figure 1, a kind of ammonia for denitrification apparatus, air mixer, comprise the incident pipeline 3 of ammonia, ammonia incident nozzle 4, flow-disturbing bluff body 5, cylindrical shell 6, collapsible tube 7, mixing tube 8 and diffuser pipe 9, cylindrical shell 6 connects collapsible tube 7, mixing tube 8 and diffuser pipe 9 successively, the incident pipeline 3 of ammonia is provided with in cylindrical shell 6, the incident nozzle 4 of ammonia is located at the tail end of the incident pipeline 3 of ammonia, and the dead ahead of the incident nozzle 4 of ammonia is provided with flow-disturbing bluff body 5.
The end of cylindrical shell 6 is provided with air intake flange 1, and the end of the incident pipeline 3 of ammonia is provided with ammonia inlet flange 2, and the afterbody of diffuser pipe 9 is provided with mixed gas outlet flange 10.
Mixed gas outlet flange 10 is 2m with the distance on the right side of diffuser pipe; Distance between flow-disturbing bluff body 5 and the incident nozzle 4 of ammonia is 35mm.
Flow-disturbing bluff body 5 is the angle of bus and axle is 60 °, and bus length is the cone of 120mm.
The incident pipeline 3 of ammonia is made up of horizontal pipe and vertical pipe, and the axis of horizontal pipe overlaps with the axis of cylindrical shell 6, and vertical pipe is through cylindrical shell 6.Collapsible tube 7 and diffuser pipe 9 are varying cross-section duct.
The diameter of cylindrical shell 6 is 300mm, and the diameter of mixing tube 8 is 300mm, and the length of collapsible tube 7 is 300mm, and the length of diffuser pipe 9 is 600mm.
Operation principle of the present invention: ammonia and air flow in cylindrical shell 6 via the incident pipeline 3 of ammonia and air intake flange 1 respectively; Ammonia is sprayed by the incident nozzle 4 of ammonia, forms one high velocity air, is broken up, and then mix with the air stream in cylindrical shell 6 after airflow strikes to flow-disturbing bluff body 5 along bluff body surface; After two strands of air-flows shrink via collapsible tube 7, mixing tube 8 and diffuser pipe 9 mix, the mixed gas outlet flange 10 eventually through the afterbody of diffuser pipe 9 flows out.
Claims (7)
1. the ammonia for denitrification apparatus, air mixer, it is characterized in that: comprise the incident pipeline (3) of ammonia, the incident nozzle (4) of ammonia, flow-disturbing bluff body (5), cylindrical shell (6), collapsible tube (7), mixing tube (8) and diffuser pipe (9), cylindrical shell (6) connects collapsible tube (7), mixing tube (8) and diffuser pipe (9) successively, the incident pipeline (3) of ammonia is provided with in cylindrical shell (6), the incident nozzle (4) of ammonia is located at the tail end of the incident pipeline (3) of ammonia, and the dead ahead of the incident nozzle (4) of ammonia is provided with flow-disturbing bluff body (5); Flow-disturbing bluff body (5) for the angle of bus and axle be 45 °, bus length is the cone of 120mm; The diameter of cylindrical shell (6) is 200mm ~ 300mm, and the diameter of mixing tube (8) is 100mm ~ 300mm, and the length of collapsible tube (7) is 200mm ~ 300mm, and the length of diffuser pipe (9) is 500mm ~ 600mm.
2. a kind of ammonia for denitrification apparatus according to claim 1, air mixer, it is characterized in that: the end of cylindrical shell (6) is provided with air intake flange (1), the end of the incident pipeline (3) of ammonia is provided with ammonia inlet flange (2), and the afterbody of diffuser pipe (9) is provided with mixed gas outlet flange (10).
3. a kind of ammonia for denitrification apparatus according to claim 2, air mixer, is characterized in that: mixed gas outlet flange (10) is 1m ~ 2m with the distance on the right side of diffuser pipe.
4. a kind of ammonia for denitrification apparatus according to claim 1, air mixer, is characterized in that: the distance between flow-disturbing bluff body (5) and the incident nozzle (4) of ammonia is 25mm ~ 35mm.
5. a kind of ammonia for denitrification apparatus according to claim 1, air mixer, it is characterized in that: the incident pipeline (3) of ammonia is made up of horizontal pipe and vertical pipe, the axis of horizontal pipe overlaps with the axis of cylindrical shell (6), and vertical pipe is through cylindrical shell (6).
6. a kind of ammonia for denitrification apparatus according to claim 1, air mixer, is characterized in that: collapsible tube (7) and diffuser pipe (9) are varying cross-section duct.
7. a kind of ammonia for denitrification apparatus according to claim 1, air mixer, it is characterized in that: the diameter of cylindrical shell (6) is 250mm, the diameter of mixing tube (8) is 200mm, and the length of collapsible tube (7) is 250mm, and the length of diffuser pipe (9) is 550mm.
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| CN201210444073.0A CN102908920B (en) | 2012-11-08 | 2012-11-08 | Ammonia and air mixer for denitrification device |
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| CN102908920B true CN102908920B (en) | 2015-07-22 |
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Address after: 100035 Beijing City, Xicheng District Xizhimen Avenue 273 Huadian Engineering building B block 503 Patentee after: CHINA HUADIAN ENGINEERING CO., LTD. Patentee after: Huadian Environmental Protection System Engineering Co., Ltd. Address before: 100035 Beijing City, Xicheng District Xizhimen Avenue 273 Huadian Engineering building B block 503 Patentee before: China Huadian Engineering (Group) Co., Ltd. Patentee before: Huadian Environmental Protection System Engineering Co., Ltd. |