CN107583489B - High-efficient denitration spouts ammonia mixing arrangement - Google Patents
High-efficient denitration spouts ammonia mixing arrangement Download PDFInfo
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- CN107583489B CN107583489B CN201711054203.9A CN201711054203A CN107583489B CN 107583489 B CN107583489 B CN 107583489B CN 201711054203 A CN201711054203 A CN 201711054203A CN 107583489 B CN107583489 B CN 107583489B
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Abstract
The invention discloses a high-efficiency denitration ammonia spraying mixing device, which belongs to the technical field of environmental protection, and comprises an ammonia spraying nozzle, and a mixing unit A and a mixing unit B which are in long-row structures, wherein the lengths of the mixing unit A and the mixing unit B extend along the depth direction of a flue, the mixing unit A and the mixing unit B are arranged in rows at intervals along the width direction of the flue in a crossing manner and uniformly cover the section of the whole flue, and the adjacent mixing unit A and the adjacent mixing unit B are symmetrical in the width direction of the flue; the mixing unit A is formed by installing the saw tooth structures in opposite and cross way by the single row of blades a and the single row of blades b, and an arch gallery structure is formed. The invention solves the problem of uniform distribution of denitration flue gas by an advanced mixing technology, meets the requirement of current ultralow emission on uniformity distribution deviation of flue gas, improves the utilization rate of reducing agent NH3, improves denitration efficiency, and finally realizes ultralow emission of NOx.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a boiler flue gas SCR denitration.
Background
The utility model provides a coal-fired flue gas SCR denitrification facility of power plant is the important technical equipment that thermal power plant controlled NOx discharged, and along with the state is paid attention to environmental protection day by day, the environmental protection policy that is strict goes out in succession, and the ultra-low emission requirement has put forward higher requirement to the advancement of current SCR denitration technique. Efficient SCR denitration is necessary to rely on more advanced ammonia spraying mixing technology, and NH in flue gas is improved by improving uniformity of flue gas mixing 3 The deviation of the NOx molar ratio distribution is controlled to be minimum, so that the SCR denitration efficiency is improved, and the requirement of ultra-low emission is met.
The ammonia injection mixing technology of the nozzle and the static mixer has better mixing performance compared with the multi-nozzle (without the mixer) technology, and therefore, the technology becomes the main stream technology of the current SCR denitration device. The principle of the mixers is that turbulence or vortex of different degrees is generated in different directions by blocking the flue gas flow, so that the flue gas mixing is enhanced, and the expected uniformity of flue gas distribution is achieved. The mixers with different structural characteristics have different mixing effects and different generated resistances.
Typical mixer configurations that are currently in use are mainly baffle (circular or triangular), corrugated, and vaned. The baffle type mixer which is obliquely arranged in the section of the flue facing the wind directly prevents the flue gas from forming vortex on the leeside of the baffle plate to improve the mixing effect, the mixing effect of the local area is strong, but the full coverage of the section of the flue cannot be realized, the mixing blind area exists, the overall mixing performance is weakened, and the resistance is larger; the corrugated plate type mixer consists of a group of corrugated steel plates which are twisted into a corrugated shape according to a certain rule and are uniformly distributed on the section of the flue, when the flue gas passes through the mixer, the flue gas is scattered and interfered with each other under the blocking of the corrugated steel plates with different directions, so that the mixing effect is improved after turbulent flow is formed; the blade type mixer is a mixing device which is formed by installing one layer or two layers of blades bent at a certain angle on the section of a flue and forming a coverage mixing area on the projection section of the flue, and when flue gas passes through the blade type mixer, turbulence and rotational flow are formed under the flow guiding effect of the blades so as to achieve the mixing effect. Compared with baffle type and corrugated type mixers, the traditional vane type mixer technology has obvious mixing effect, but is still difficult to meet the harsher flue gas uniformity distribution requirement for the currently proposed ultra-low emission requirement and the high-efficiency denitration under the low NOx condition.
Disclosure of Invention
The invention aims at: the high-efficiency denitration ammonia spraying mixing device solves the problem of uniform distribution of denitration flue gas by an advanced mixing technology, meets the requirement of current ultralow emission on uniformity distribution deviation of flue gas, and improves the NH of a reducing agent 3 The utilization rate of the catalyst is improved, the denitration efficiency is improved, and finally the ultralow emission of NOx is realized.
The aim of the invention is achieved by the following technical scheme:
the high-efficiency denitration ammonia spraying mixing device comprises an ammonia spraying nozzle, and a mixing unit A and a mixing unit B which are in long-row structures, wherein the lengths of the mixing unit A and the mixing unit B extend along the depth direction of a flue, the mixing unit A and the mixing unit B are arranged in rows at intervals in the width direction of the flue in a crossing manner and uniformly cover the section of the whole flue, and the adjacent mixing units A and B are symmetrical in the width direction of the flue; the mixing unit A is formed by oppositely and crossly buckling and installing a sawtooth structure by a single row of blades a and a single row of blades b, so as to form an arch gallery structure; the single-row blades a are formed by rectangular strip-shaped bottoms and a row of protruding parts arranged along the bottoms, each protruding part forms a sawtooth structure on the bottoms, each protruding part comprises a nearly right trapezoid protruding part positioned at two ends of the bottoms and a plurality of isosceles trapezoid protruding parts positioned among the nearly right trapezoid protruding parts, each protruding part is bent at an acute angle relative to each other along a bending line a1 of the long edge of the bottoms, and is continuously bent at a larger acute angle relative to a bending line a2 forming an acute angle with the bending line a1, and the bending line a2 of one nearly right trapezoid protruding part is not intersected with the bending line a1 to leave a gap, and the bending lines a2 of other protruding parts are intersected with the bending line a 1; the single-row blades b are formed by rectangular strip-shaped bottoms and a row of isosceles trapezoid protruding parts arranged along the bottoms, the protruding parts form a saw-tooth structure on the bottoms, the protruding parts are bent at an acute angle relative to each other along a bending line a1 at the edge of the long side of the bottoms, the protruding parts continue to be bent at a larger acute angle relative to each other along a bending line a2 forming an acute angle with the bending line a1, and the bending line a2 of each protruding part is intersected with the bending line a 1; and ammonia spraying nozzles are correspondingly arranged at the upstream positions of the intersections of the convex parts of the adjacent two single-row blades forming each mixing unit, and the nozzles are uniformly arranged on the section of the whole flue.
Aiming at the current mixing requirement of ultra-low emission and higher uniformity of denitration, the invention provides a novel-structure mixing device, the flue gas can be fully covered on the section of a flue under the action of the mixing device, stronger turbulence and rotational flow are generated in a short distance, the ideal mixing effect is achieved, the resistance is smaller, and the long-standing problems of the following prior art are mainly solved:
1. solves the problem of blind areas in the mixing area and strengthens the mixing effect. The technology ensures full coverage of the mixing area of the section of the flue by improving the geometric shape and arrangement mode of the blades, strengthens the mixing effect of the section of the whole flue under the action of the mixing device of the technology, avoids dead zones and dead zones, further improves the uniformity of flue gas distribution of the denitration inlet, controls the distribution deviation of the molar ratio of ammonia nitrogen to the minimum, and provides more ideal flow field conditions for efficient denitration.
2. Solves the problem of overlong mixing distance caused by insufficient mixing strength. The technology determines the optimal geometric shape and angle of the blades of the mixing device through a fluid model test, so that the flue gas with a certain flow velocity simultaneously generates stronger turbulence and rotational flow under the action of the flue gas, the full mixing is completed in a short distance, and the required mixing distance is reduced.
3. Solves the problem of bigger running resistance of the mixing device. The optimal geometry and size of the mixing device under the condition of meeting the expected mixing effect are determined through a flow field simulation test, so that the running resistance of the mixing device is ensured to be minimized, and the mixing device is easy to manufacture and install.
Alternatively, ammonia injection nozzles are correspondingly arranged at positions 200-500mm upstream of intersections of the convex portions of adjacent two single-row blades constituting each mixing unit.
Alternatively, each convex part of the single-row blades a is bent by 10-15 degrees relatively along a bending line a1 at the edge of the long side of the bottom, and is further bent by 30-45 degrees relatively along a bending line a2 forming an included angle of 15+/-5 degrees with the bending line a 1; the convex parts of the single-row blades b are bent by 10-15 degrees along the bending line a1 at the edge of the long side of the bottom, and are further bent by 30-45 degrees along the bending line a2 forming an included angle of 15+/-5 degrees with the bending line a 1.
As a further option, the bending angles of the single row of blades a and the single row of blades b are consistent, and the included angles between the bending lines are consistent. In this scheme, for each bending angle and the contained angle between the bending lines that single row blade a adopted, single row blade b keeps unanimous with it.
The foregoing inventive subject matter and various further alternatives thereof may be freely combined to form a plurality of alternatives, all of which are employable and claimed herein; and the invention can be freely combined between the (non-conflicting choices) choices and between the choices and other choices. Various combinations will be apparent to those skilled in the art from a review of the present disclosure, and are not intended to be exhaustive or all of the present disclosure.
The invention has the beneficial effects that:
1. the blades of the mixing element are fully covered on the section of the flue, the gap is small, no mixing dead zone and dead zone exist when the flue gas passes through, the mixing is uniform, and the occupied installation space is small.
2. The rotation directions of the adjacent mixing unit blades are opposite, and the rotational flow and the turbulent flow generated when the flue gas passes through are mutually interfered, so that the mixing effect is enhanced, and the mixing path is shortened.
3. And determining the bending angle of the blade with the optimal mixing effect through a flow field simulation test, and realizing the minimum resistance.
4. The size, the number and the gaps of the blades can be flexibly adjusted according to the section size of the flue, and the adaptability of the arrangement space is strong.
5. The mixing blade can be integrally formed by shearing and bending a steel plate, and is simple to manufacture and convenient to install.
Drawings
FIG. 1 is a schematic view of a planar deployment configuration of a single row of blades a in accordance with an embodiment of the present invention;
FIG. 2 is a schematic plan view of a single row blade b according to an embodiment of the present invention;
fig. 3 is a schematic plan view of a mixing unit a according to an embodiment of the present invention;
fig. 4 is a schematic perspective view of a mixing unit a according to an embodiment of the present invention;
FIG. 5 is a schematic view of a planar deployment configuration of a single row of blades c according to an embodiment of the invention;
FIG. 6 is a schematic view of a planar deployment configuration of a single row of blades d according to an embodiment of the invention;
fig. 7 is a schematic plan view of a mixing unit B according to an embodiment of the present invention;
fig. 8 is a schematic perspective view of a mixing unit B according to an embodiment of the present invention;
FIG. 9 is a schematic plan view of a mixing device of an embodiment of the invention disposed in a flue;
FIG. 10 is an elevational schematic of the mixing device of an embodiment of the invention disposed in a flue;
FIG. 11 is a schematic perspective view of a mixing device of an embodiment of the invention disposed in a flue;
FIG. 12 is a graph showing the relationship between the standard deviation and the distance of ammonia nitrogen molar ratio at an ammonia injection rate of 15 m/s;
FIG. 13 is a plot of ammonia nitrogen mole ratio versus standard deviation versus distance for a flue gas flow rate of 14.5 m/s;
FIG. 14 is a graph of ammonia nitrogen molar ratio versus standard deviation versus distance for a blade clearance of 0.05 m;
FIG. 15 is a plot of ammonia nitrogen mole ratio versus standard deviation versus distance for a nozzle at a distance of 0.5m from the mixing device;
FIG. 16 is a schematic illustration of blade clearance versus drag;
wherein 1 is a mixing unit A, 2 is a mixing unit B, 3 is a single row blade a, 4 is a single row blade B, 5 is a single row blade c, 6 is a single row blade d, 7 is a bottom, 8 is a nearly right trapezoid protruding part, 9 is an isosceles trapezoid protruding part, 10 is a bending line a1, 11 is a bending line a2, 12 is a gap, and 13 is a nozzle.
Detailed Description
The following non-limiting examples illustrate the invention.
Referring to fig. 1 to 11, wherein the left-right direction in the paper surface of fig. 9 is the flue width direction, the up-down direction is the flue depth direction, and the direction perpendicular to the paper surface is the flue length direction; similarly, the left-right direction in the sheet of fig. 10 is the flue width direction, the up-down direction is the flue length direction, and the direction perpendicular to the sheet is the flue depth direction.
Referring to fig. 9 to 11, a high-efficiency denitration ammonia injection mixing device comprises an ammonia injection nozzle 13, and mixing units A1 and B2 which are in a long-row structure, wherein the lengths of the mixing units A1 and B2 extend along the depth direction of a flue, the mixing units A1 and B2 are arranged in rows at intervals along the width direction of the flue in a crossing manner and uniformly cover the section of the whole flue, and adjacent mixing units A1 and B2 are symmetrical in the width direction of the flue; referring to fig. 3 to 4, the mixing unit A1 is formed by installing saw-tooth structures in opposite and crossed manner by a single row of blades a3 and a single row of blades b4, and forms an arch gallery structure; referring to fig. 1, the single row of blades a3 is formed by a rectangular strip-shaped bottom 7 and a row of protruding parts along the bottom 7, each protruding part forms a saw-tooth structure on the bottom 7, the protruding parts comprise near right trapezoid protruding parts 8 positioned at two ends of the bottom 7 (because the near right trapezoid protruding parts 8 need to keep the edges to be attached to the inner wall of the flue after two times of bending, they cannot be completely right trapezoid, but need to make certain adjustment relative to the right trapezoid so that the edges are attached to the inner wall of the flue, namely, the near right trapezoid), and a plurality of isosceles trapezoid protruding parts 9 between the near right trapezoid protruding parts 8, each protruding part bends relatively for an acute angle alpha along a bending line a1 10 of the edge of the long side of the bottom 7, and continues bending for a larger acute angle beta along a bending line a2 forming an acute angle gamma with the bending line a1, and the bending line a2 and the bending line a1 10 of one near right trapezoid protruding part 8 do not intersect to leave a gap 12, and the bending line a2 and the bending line a1 10 of the other protruding parts intersect; referring to fig. 2, the single row of blades b4 is formed by a rectangular strip-shaped bottom 7 and a row of isosceles trapezoid protrusions 9 along the bottom 7, each protrusion forms a saw-tooth structure on the bottom 7, each protrusion is bent at an acute angle α relative to a bending line a1 10 along the long edge of the bottom 7, and is further bent at a larger acute angle β relative to a bending line a2 11 forming an acute angle γ with the bending line a1 10, and the bending line a2 11 of each protrusion intersects with the bending line a 1. Referring to fig. 7 to 8, the mixing unit B2 is formed by installing the saw-tooth structures in opposite and crossed directions by a single row of blades c5 and a single row of blades d6, so as to form an arch gallery structure; wherein a single row of blades c5 is shown with reference 5 and a single row of blades d6 is shown with reference 6. Referring to FIGS. 9 and 10, the ammonia spraying nozzles 13 are disposed at positions corresponding to the upstream distance L between the intersections of the projections of the adjacent two single-row blades constituting each mixing unit, and the nozzles 13 are uniformly disposed over the entire flue cross section
Alternatively, as shown in the drawings of the present embodiment, the ammonia injection nozzles 13 are provided correspondingly at positions where the upstream distance L at the intersection of the convex portions of the adjacent two single-row blades constituting each mixing unit is 200 to 500 mm. The included angles between the single-row blades a3 and b4 and between the single-row blades c5 and d6 are consistent, and the included angles between the bending lines are consistent with the included angles between the bending lines and the included angles between the bending lines adopted by the single-row blades a3, and the single-row blades b4 are consistent with the included angles between the bending lines; likewise, for each bend angle assumed by the single row of blades c5 and the angle between the bend lines, the single row of blades d6 remains identical thereto. Specifically:
the convex parts of the single-row blades a3 and c5 are bent at an acute angle alpha of 10-15 degrees relative to the bending line a1 10 at the edge of the long side of the bottom, and are continuously bent at an acute angle beta of 30-45 degrees relative to the bending line a2 11 forming an included angle gamma of 15+/-5 degrees with the bending line a1 10; the convex parts of the single-row blades b4 and d6 are bent at an acute angle alpha of 10-15 degrees relative to the bending line a1 10 along the edge of the long side of the bottom, and are further bent at an acute angle beta of 30-45 degrees relative to the bending line a2 11 forming an included angle gamma of 15+/-5 degrees with the bending line a1 10.
As an example, reference is made to graphs of the effects of flue gas flow rate, ammonia injection rate, nozzle distance, blade gap on mixing effect and the effects of blade gap on resistance in the numerical simulation calculations shown in fig. 12 to 16. The mixing device is arranged on a certain 350MW unit denitration device, the mixing device is distributed on the rising section of the SCR denitration inlet flue, the size of the hollow section in the flue is 9.99mX2.6m, the flue gas amount is 556508Nm3/h, and the flue gas flow rate is 14.2m/s. The mixing effect of the mixing device is verified by calculating the distribution deviation condition of the molar ratio of ammonia nitrogen under the conditions of different ammonia spraying distances, ammonia spraying flow rates and blade gaps through numerical simulation. According to the simulation calculation result, when the nozzle is 0.5m away from the mixing device, the ammonia spraying flow rate is 14.5m/s, and the blade gap is 0.06m, the ammonia nitrogen molar ratio distribution deviation at the position, which is 3m away from the nozzle, of the downstream of the mixing device is minimum, and the mixing effect is good. The length of the mixing path of the downstream straight section of the mixing device can be controlled within the range of 2-2.5 m, and the resistance is less than 100Pa.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The utility model provides a high-efficient denitration spouts ammonia mixing arrangement which characterized in that: the device comprises an ammonia spraying nozzle, and a mixing unit A and a mixing unit B which are in long-column structures, wherein the lengths of the mixing unit A and the mixing unit B extend along the flue depth direction, the mixing unit A and the mixing unit B are arranged in rows at intervals along the flue width direction in a crossing manner and uniformly cover the section of the whole flue, and the adjacent mixing unit A and the adjacent mixing unit B are symmetrical in the flue width direction; the mixing unit A is formed by oppositely and crossly buckling and installing a sawtooth structure by a single row of blades a and a single row of blades b, so as to form an arch gallery structure; the single-row blades a are formed by rectangular strip-shaped bottoms and a row of protruding parts arranged along the bottoms, each protruding part forms a sawtooth structure on the bottoms, each protruding part comprises a nearly right trapezoid protruding part positioned at two ends of the bottoms and a plurality of isosceles trapezoid protruding parts positioned among the nearly right trapezoid protruding parts, each protruding part is bent at an acute angle relative to each other along a bending line a1 of the long edge of the bottoms, and is continuously bent at a larger acute angle relative to a bending line a2 forming an acute angle with the bending line a1, and the bending line a2 of one nearly right trapezoid protruding part is not intersected with the bending line a1 to leave a gap, and the bending lines a2 of other protruding parts are intersected with the bending line a 1; the single-row blades b are formed by rectangular strip-shaped bottoms and a row of isosceles trapezoid protruding parts arranged along the bottoms, the protruding parts form a saw-tooth structure on the bottoms, the protruding parts are bent at an acute angle relative to each other along a bending line a1 at the edge of the long side of the bottoms, the protruding parts continue to be bent at a larger acute angle relative to each other along a bending line a2 forming an acute angle with the bending line a1, and the bending line a2 of each protruding part is intersected with the bending line a 1; and ammonia spraying nozzles are correspondingly arranged at the upstream positions of the intersections of the convex parts of the adjacent two single-row blades forming each mixing unit, and the nozzles are uniformly arranged on the section of the whole flue.
2. The efficient denitration ammonia injection mixing device as recited in claim 1, wherein: the convex parts of the single-row blades a are bent by 10-15 degrees relatively along a bending line a1 at the edge of the long side of the bottom, and are continuously bent by 30-45 degrees relatively along a bending line a2 forming an included angle of 15+/-5 degrees with the bending line a 1; the convex parts of the single-row blades b are bent by 10-15 degrees along the bending line a1 at the edge of the long side of the bottom, and are further bent by 30-45 degrees along the bending line a2 forming an included angle of 15+/-5 degrees with the bending line a 1.
3. The efficient denitration ammonia injection mixing device as recited in claim 2, wherein: the bending angles of the single-row blades a and the single-row blades b are consistent, and the included angles between the bending lines are consistent.
4. The efficient denitration ammonia injection mixing device as recited in claim 1, wherein: and ammonia spraying nozzles are correspondingly arranged at the positions 200-500mm upstream of the intersections of the convex parts of the adjacent two single-row blades forming each mixing unit.
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| CN201711054203.9A CN107583489B (en) | 2017-10-31 | 2017-10-31 | High-efficient denitration spouts ammonia mixing arrangement |
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| CN207463021U (en) * | 2017-10-31 | 2018-06-08 | 东方电气集团东方锅炉股份有限公司 | A kind of NO_x Reduction by Effective sprays ammonia mixing arrangement |
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| WO2005058521A1 (en) * | 2003-12-17 | 2005-06-30 | Airbus | Foldable mandrel for production of a single curvature folded core for a sandwich panel |
| WO2008119245A1 (en) * | 2007-03-31 | 2008-10-09 | Jiubin Chen | Flywheel engine |
| JP2013006148A (en) * | 2011-06-24 | 2013-01-10 | Mitsubishi Heavy Ind Ltd | Exhaust gas duct and denitration device having the same |
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