CN212188585U - Coal fired boiler SCR denitration reactor inlet flue venturi bar grid mixing device - Google Patents
Coal fired boiler SCR denitration reactor inlet flue venturi bar grid mixing device Download PDFInfo
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- CN212188585U CN212188585U CN202020407960.0U CN202020407960U CN212188585U CN 212188585 U CN212188585 U CN 212188585U CN 202020407960 U CN202020407960 U CN 202020407960U CN 212188585 U CN212188585 U CN 212188585U
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Abstract
The utility model relates to a coal fired boiler SCR denitration reactor entry flue venturi stick bars increases muddy device, including flue entry guide plate, spout ammonia grid, venturi stick bars, Z type flue and flue export guide plate, flue entry guide plate is located the bottom of Z type flue, and flue entry guide plate top is the ammonia grid that spouts, and the venturi stick bars is located and spouts ammonia grid top, and there is flue export guide plate venturi stick bars top. The Venturi rod grid of the utility model is divided into two layers which are mutually and vertically arranged in a crossed way, so that the flue gas flow field distribution of the cross section of the whole flue can be adjusted in two directions of the plane; form the venturi passageway between the circular steel pipe of venturi stick bars, form drainage and vortex mixing with higher speed to the flue gas, strengthened reductant and flue gas in nitrogen oxide's the homogeneity of mixing, guaranteed reductant and nitrogen oxide's intensive mixing in the flue gas, improved denitration efficiency greatly.
Description
Technical Field
The utility model relates to a flue gas purification handles technical field, especially relates to a coal fired boiler SCR denitration reactor entry flue venturi stick bars and bars increase and mix device.
Background
The coal-fired boiler can produce flue gas, the flue gas contains harmful substances of nitric oxide, and along with the improvement of the requirement of China on the aspect of environmental protection, the flue gas needs to be subjected to denitration treatment and must be discharged in a harmless manner.
At present, ammonia water or urea is generally used as a reducing agent in the denitration treatment technology of domestic flue gas, the reducing agent is directly sprayed into a hearth in a high-temperature denitration (SNCR) process, and NO in the processXThe removal rate is generally 30-80%, and in order to further improve the flue gas denitration efficiency, an SCR denitration system is adopted at present, namely, flue gas led out from a boiler economizer is connected into an SCR reactor filled with a catalyst, under the action of the catalyst, an injected reducing agent and nitrogen oxide in the flue gas are subjected to high-efficiency reaction to generate nitrogen and water, and then the nitrogen oxide is removed, but on the cross section of an inlet flue of the SCR reactor, the concentration distribution of the reducing agent and the nitrogen oxide is not uniform, the distribution difference of the reducing agent and the nitrogen oxide in the width direction of the flue is large, and the reduction of the flue gas denitration efficiency and the increase of ammonia escape amount can be caused. Therefore, a mixing device is required to be installed in front of the flue inlet of the SCR reactor so as to realize the distribution uniformity of the reducing agent and the nitrogen oxide on the flue.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing a coal-fired boiler SCR denitration reactor inlet flue Venturi bar grid mixing device.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a coal fired boiler SCR denitration reactor entry flue venturi bar bars increases mixes device, includes flue entry guide plate, spouts ammonia grid, venturi bar bars, Z type flue and flue outlet guide plate, flue entry guide plate is located the bottom of Z type flue, flue entry guide plate top is spout the ammonia grid, venturi bar bars is located spout ammonia grid top, venturi bar bars top has flue outlet guide plate, venturi bar bars includes upper venturi bar bars and lower floor venturi bar.
Preferably, the lower-layer venturi rod grid consists of a plurality of circular steel pipes which are distributed along the Y direction of the cross section of the flue, and a gap is arranged between each circular steel pipe of the lower-layer venturi rod grid; the upper layer Venturi rod grid is composed of a plurality of round steel pipes and distributed along the X direction of the cross section of the flue, and intervals are arranged among round light pipes of the upper layer Venturi rod grid.
Preferably, the upper-layer Venturi rod grids and the lower-layer Venturi rod grids are perpendicularly arranged in a crossed mode, and the central included angle is 90 degrees.
Preferably, the windward side of the single round steel pipe of the venturi rod grid is provided with anti-abrasion angle steel, and the anti-abrasion angle steel is in an inverted triangle shape.
Preferably, the distance between the upper-layer Venturi rod grid and the lower-layer Venturi rod grid is between 800 and 1500 mm.
Preferably, the porosity of the rod grid layer of the Venturi rod grid is 35-50%.
Preferably, the flue inlet baffle is arranged at the lowest part of the Z-shaped flue, and the flue inlet baffle is in a concave arc shape.
Preferably, the flue outlet guide plate is positioned at the uppermost part of the Z-shaped flue, and the flue outlet guide plate is in a convex arc shape.
Preferably, the nominal diameter of the single round steel pipe of the Venturi bar grid is 100-200 mm.
Compared with the prior art, the beneficial effects of the utility model are that: (1) the Venturi rod grids are divided into two layers which are mutually and vertically arranged in a crossed manner, so that the smoke flow field distribution of the smoke on the section of the whole flue can be adjusted in two planar directions; (2) form the venturi passageway between the circular steel pipe of venturi stick bars, form drainage and vortex mixing with higher speed to the flue gas, strengthened reductant and flue gas in nitrogen oxide's the homogeneity of mixing, guaranteed reductant and nitrogen oxide's intensive mixing in the flue gas, improved denitration efficiency greatly.
Drawings
FIG. 1 is a schematic structural view of a Venturi rod grid mixing device of an inlet flue of an SCR denitration reactor of a coal-fired boiler;
FIG. 2 is a cross-sectional view of the mixing device of the present invention;
FIG. 3 is a sectional view of the mixing device of the present invention taken along the line B-B;
FIG. 4 is a cross-sectional view of the mixing device of the present invention;
FIG. 5 is a schematic view showing the structure and the flow of flue gas of the Venturi rod grid layer according to the present invention;
in the figure: a flue inlet guide plate-1; an ammonia injection grid-2; a Venturi rod grid-3, an upper layer Venturi rod grid-31; a lower venturi rod grid-32; a Z-shaped flue-4; a flue outlet guide plate-5.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Example 1: referring to fig. 1, the utility model discloses a coal fired boiler SCR denitration reactor entry flue venturi stick bars muddy device, including flue entry guide plate 1, spout ammonia grid 2, venturi stick bars 3, Z type flue 4 and flue export guide plate 5, flue entry guide plate 1 is located the bottom of Z type flue 4, flue entry guide plate 1 top is spout ammonia grid 2, venturi stick bars 3 are located spout ammonia grid 2 top, there is flue export guide plate 5 above venturi stick bars 3, venturi stick bars 3 include lower floor venturi stick bars 32 and upper venturi stick bars 31; the utility model discloses a flue gas comes from the flue gas in the boiler, and the flue gas gets into through increasing muddy device bottom side entry, then through entry flue backflow board 1 for the flue gas gets into Z type flue 4, and ammonia injection grid 2 releases reductant NH3Etc. so that NH3With NO in the flue gasXThe reaction is carried out, then the flue gas passes through the Venturi rod grid 3, the Venturi rod grid 3 carries out flue gas strong circumfluence in the X direction and the Y direction, so that NH is generated3And NOXThe concentration distribution is even, the denitration efficiency is improved, and then the denitration efficiency is improved through a flue outlet guide plateAnd 5, conducting flow guiding on the flue gas, discharging the flue gas through an outlet at the side edge of the top of the mixing device, and discharging the flue gas to the SCR reactor.
Preferably, flue inlet guide plate 1 is in the below of Z type flue, flue inlet guide plate 1 is concave arc form, flue inlet guide plate 1 gets into the better drainage of Z nature flue 4 to the flue gas.
Preferably, flue outlet guide plate 5 is located the top of Z type flue, flue outlet guide plate 5 is protruding arc form, flue outlet guide plate 5 carries out the drainage to flue gas entering SCR reactor, plays the effect of drainage.
Example 2: referring to fig. 2, fig. 2 is a cross-sectional structure view of a mixing device of the present invention; the utility model discloses a lower floor's venturi bar 32 with upper venturi bar 31 mutually perpendicular, exhanst gas outlet is in the top of intensive mixing device, the flue gas entry is in the bottom of intensive mixing device, upper venturi bar 31 comprises many circular steel pipes 33, arranges along flue cross-section X direction and interval certain distance, and lower floor's venturi bar 32 comprises many circular steel pipes 33, arranges along flue cross-section Y direction and interval certain distance, and circular steel pipe interval is favorable to controlling flue gas flow for NH in the reductant3Better mixing with nitrogen oxide in the flue gas.
Preferably, the distance between the lower venturi bar 32 and the upper venturi bar 31 is between 800 and 1500 mm.
Preferably, the rod grid layer porosity of the venturi rod grid 3 is 35-50%.
Example 3: referring to fig. 3 and fig. 4, fig. 3 is a sectional view of the mixing device of the present invention taken along the line B-B; FIG. 4 is a cross-sectional view of the mixing device of the present invention; in the utility model, the lower-layer Venturi rod grid 32 is composed of a plurality of round steel pipes which are distributed along the Y direction of the cross section of the flue, a space 321 is arranged between each round steel pipe of the lower-layer Venturi rod grid 32, and a gap is also arranged between the lower-layer Venturi rod grid 32 and the side wall 322 of the flue; upper venturi stick bars 31 comprises many circular steel pipes, distributes along flue cross section X direction, be provided with interval 311 between the every circular light pipe of upper venturi stick bars 31, there is also the clearance between upper venturi stick bars 31 and the flue lateral wall 312, and venturi stick bars 3 divide two-layer to arrange for the flue gas in flue cross section all can adjust flue gas flow field distribution in two directions on the plane, with the intensive flue gas vortex intensity and the concentration distribution homogeneity, guaranteed reductant ammonia and pollutant nitrogen oxide's intensive mixing in the flue gas.
Preferably, the lower layer of venturi rod grids 32 and the upper layer of venturi rod grids 31 are arranged in a mutually perpendicular and crossed manner, and the central included angle is 90 degrees, so that the flue gas on the cross section of the flue can adjust the flow field distribution of the flue gas in two directions of the plane, and the strength and the concentration distribution uniformity of the flue gas turbulent flow are enhanced.
Example 4: referring to fig. 5, fig. 5 is a schematic view showing the structure and the flue gas flow of the venturi rod grid layer of the present invention; the utility model is characterized in that the windward side of the single round steel pipe 33 of the Venturi bar 3 is provided with an anti-abrasion angle steel 34, the anti-abrasion angle steel 34 is in an inverted triangle shape, and the anti-abrasion angle steel can reduce the scouring of high-speed flue gas in the Z-shaped flue 4 to the Venturi bar 3; in the flowing process of the flue gas, the flue gas flows 36 through the Venturi channel 35 at intervals between the round steel pipes 33, accelerated drainage and turbulent flow mixing are formed on the flue gas, rectification and strong mixing in the X direction and the Y direction on the cross section of the flue can be realized, the mixing uniformity of the reducing agent ammonia gas and nitrogen oxides in the flue gas is enhanced, and NH is added into the flue gas3And NOXThe concentration deviation is controlled to be below 5%, and the denitration efficiency is greatly improved.
Preferably, the nominal diameter of the single circular steel pipe of the venturi rod grid 3 is 100-200mm, the venturi rod grid 3 is made of carbon steel, the carbon steel has high strength, high hardness and low cost, and is not easy to corrode.
From the above, the venturi bar grid mixing device of the inlet flue of the SCR denitration reactor of the coal-fired boiler is divided into two layers which are vertically and crossly arranged, so that the flue gas flow field distribution of the flue gas at the cross section of the whole flue can be adjusted in two directions on the plane; form the venturi passageway between the circular steel pipe of venturi stick bars, form drainage and vortex mixing with higher speed to the flue gas, strengthened reductant and flue gas in nitrogen oxide's the homogeneity of mixing, guaranteed reductant and nitrogen oxide's intensive mixing in the flue gas, improved denitration efficiency greatly.
The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.
Claims (9)
1. The utility model provides a coal fired boiler SCR denitration reactor entry flue venturi bar bars fence intensive mixing device, its characterized in that includes flue entry guide plate, spouts ammonia grid, venturi bar fence, Z type flue and flue outlet guide plate, flue entry guide plate is located the bottom of Z type flue, flue entry guide plate top is spout the ammonia grid, the venturi bar fence is located spout ammonia grid top, there is venturi bar fence top flue outlet guide plate, the venturi bar fence includes upper venturi bar fence and lower floor venturi bar fence.
2. The coal-fired boiler SCR denitration reactor inlet flue Venturi rod grid mixing device of claim 1, wherein the lower layer Venturi rod grid is composed of a plurality of round steel pipes which are distributed along the Y direction of the flue section, and a gap is arranged between each round steel pipe of the lower layer Venturi rod grid; the upper layer Venturi rod grid is composed of a plurality of round steel pipes and distributed along the X direction of the cross section of the flue, and intervals are arranged among round light pipes of the upper layer Venturi rod grid.
3. The coal-fired boiler SCR denitration reactor inlet flue venturi rod grid mixing device of claim 1, wherein the upper layer venturi rod grid and the lower layer venturi rod grid are arranged perpendicularly and crosswise with a central included angle of 90 °.
4. The coal fired boiler SCR denitration reactor inlet flue venturi bar grid mixing device of claim 1, wherein a single circular steel pipe windward side of the venturi bar grid is provided with anti-abrasion angle steel, and the anti-abrasion angle steel is in an inverted triangle shape.
5. The coal-fired boiler SCR denitration reactor inlet flue venturi rod grid mixing device of claim 1, wherein the distance between the upper layer venturi rod grid and the lower layer venturi rod grid is between 800-1500 mm.
6. The coal-fired boiler SCR denitration reactor inlet flue venturi rod grid mixing device of claim 1, wherein the rod grid layer porosity of the venturi rod grid is 35-50%.
7. The coal fired boiler SCR denitration reactor inlet flue venturi rod grid mixing enhancement device of claim 1, wherein the flue inlet guide plate is at the lowest of the Z-shaped flue, and the flue inlet guide plate is in a concave arc shape.
8. The coal fired boiler SCR denitration reactor inlet flue venturi rod grid mixing increasing device of claim 1, wherein the flue outlet guide plate is located at the uppermost of the Z-shaped flue, and the flue outlet guide plate is in a convex arc shape.
9. The coal-fired boiler SCR denitration reactor inlet flue venturi rod grid mixing device of claim 1, wherein a single round steel pipe of the venturi rod grid has a nominal diameter of 100-200 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020407960.0U CN212188585U (en) | 2020-03-26 | 2020-03-26 | Coal fired boiler SCR denitration reactor inlet flue venturi bar grid mixing device |
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| CN202020407960.0U CN212188585U (en) | 2020-03-26 | 2020-03-26 | Coal fired boiler SCR denitration reactor inlet flue venturi bar grid mixing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114642951A (en) * | 2022-02-22 | 2022-06-21 | 北京航天环境工程有限公司 | Flue gas treatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114642951A (en) * | 2022-02-22 | 2022-06-21 | 北京航天环境工程有限公司 | Flue gas treatment device |
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