CN102240506B - Modular selective catalytic reduction (SCR) denitration rectification grating device - Google Patents
Modular selective catalytic reduction (SCR) denitration rectification grating device Download PDFInfo
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- CN102240506B CN102240506B CN 201110136123 CN201110136123A CN102240506B CN 102240506 B CN102240506 B CN 102240506B CN 201110136123 CN201110136123 CN 201110136123 CN 201110136123 A CN201110136123 A CN 201110136123A CN 102240506 B CN102240506 B CN 102240506B
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Abstract
The invention belongs to the technical field of smoke denitration (namely NOx removal), and relates to a modular selective catalytic reduction (SCR) denitration rectification grating device, which is characterized in that longitudinal gratings and transverse gratings of rectification modules are in crossed connection mutually to be fixed and have a grid-shaped structure in which a plurality of hollow thin-wall pipes are arranged and connected regularly and mutually, and the axial directions of the hollow thin-wall pipes are consistent with the height directions of the rectification modules; a sealing element is divided into an internal sealing element and an external sealing element; the internal sealing element is positioned in gaps among the rectification modules; and the external sealing element is positioned between the rectification modules and the inner wall of an SCR reactor. The invention has the advantages that after smoke passes through the modular SCR denitration rectification grating device, the flow direction and flow speed distribution of the smoke mingled with dust achieve an ideal effect; meanwhile, the dust in the smoke cannot be accumulated on the rectification grating device; and the rectification grating device is easy to manufacture and low in comprehensive investment cost, and is not needed to be overhauled or maintained, the cost of materials is low, and the flow field performance of the smoke is improved, so the NOx removal performance of the system is improved.
Description
Technical field
The invention belongs to denitrating flue gas (being that NOx removes) technical field, relate in a kind of SCR of being applied to denitrating system, make flue gas and dust equally distributed modularization SCR denitration flow straightening grid device before entering catalyst layer.
Background technology
The NOx(nitrogen oxide) be one of main atmosphere pollution, nitrogen oxide is produced when the high-temp combustion by fossil fuel and air, comprises nitric oxide (NO), nitrogen dioxide (NO
2) and nitrous oxide (N
2O), also has NxOy.The SCR(selective catalytic reduction, Selective Catalytic Reduction is called for short SCR) denitration technology, be with certain density ammonia (NH
3) mix with flue gas in the spirt flue gas, in reactor through catalyst action, with NH
3Reaction generates nontoxic N with NOx
2And water, reach the purpose of NO_x removal.Because moment occured when denitration reaction was flue gas contact solid catalyst surface, so the uniformity of the denitration performance of system and flue gas flow field and velocity flow profile have direct decisive relation.
The SCR denitration technology is owing to there being higher denitration efficiency, and the SCR method is adopted in most power-plant flue gas denitrations in the world at present.To arrange a large amount of difform deflectors at SCR denitration inlet flue duct and reactor front end generally speaking, make flue gas and dust flow distribution reach needed requirement, but from domestic and international installation and operating experience, because the SCR reactor cross section is large, and the catalyst stream field distributes and has relatively high expectations, the deflector fabrication and installation difficulty that various shapes are strange is very large, dust in the flue gas is as easy as rolling off a log simultaneously piles up in baffle surface, install and system operation cost thereby increase, denitration performance is also had a greatly reduced quality.
Summary of the invention
The objective of the invention is in order to overcome the defective of prior art, provide a kind of simple in structure, the flue gas flow field performance is good, efficient easy for installation is high, material is saved the low modularization SCR denitration flow straightening grid device of cost.
For achieving the above object, the technical scheme that adopts is: modularization SCR denitration flow straightening grid device, comprise a plurality of rectification modules and the potted component that place in the described SCR reactor, it is characterized in that: the vertical grid of described rectification module and the horizontal mutual interconnection of grid are fixed, be the fenestral fabric that the mutual proper alignment of a plurality of hollow and thin-walled pipes connects, be equipped with around fixing frame around the described rectification module, the axis direction of described hollow and thin-walled pipe is consistent with the rectification module short transverse; Described potted component is divided into interior potted component and outer sealing element, the gap of interior potted component between described rectification module, outer sealing element is between rectification module and SCR reactor wall, described interior potted component top is arrow shaped, outer sealing element top is half arrow shaped, described arrow and half arrow towards relative with flue gas flow direction.
The cross section of described hollow and thin-walled pipe is square, is arranged by hollow and thin-walled pipe-space, space to be welded and fixed, and consists of square net.
The material of described rectification module and potted component is metal material.
The invention has the beneficial effects as follows: modularization SCR denitration flow straightening grid device is positioned on the interior ground floor catalyst top brace summer of SCR reactor, so that flue gas is behind process modularization SCR denitration flow straightening grid device, before entering SCR reactor ground floor catalyst, the flue gas flow direction and the velocity flow profile that are mingled with dust reach ideal effect, flue gas flow rate distribution bias≤15%; The maximum deviation angle of flue gas flow direction and vertical direction is ± 15 °; Arrow shaped and half arrow shaped potted component can't be piled up at the flow straightening grid device dust in the flue gas, have improved the flue gas flow field performance, thereby have improved the performance of system's NO_x removal; Simultaneously modularization SCR denitration flow straightening grid device fabrication and installation simple and fast, material is cheap, need not repair and maintenance, and comprehensive method of investment cost is low.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is installation of the present invention and use location schematic diagram;
Fig. 2 is among Fig. 1
IThe structure for amplifying schematic diagram;
Fig. 3 be among Fig. 1 A of the present invention to structural representation;
Fig. 4 is among Fig. 3
IIThe local structure for amplifying schematic diagram of single rectification module;
Fig. 5 is inner seal liner structural representation (amplification);
Fig. 6 is outside seal may structural representation (amplification).
Among the figure: the 1-SCR reactor; The 2-rectification module; Potted component in the 3-; The 4-outer sealing element; The 5-frame; 6-hollow and thin-walled pipe; 7-the first Catalytic Layer; The 8-brace summer; 9-flow straightening grid device installation site.
The specific embodiment
Fig. 1 is installation of the present invention and use location schematic diagram, diagram modularization SCR denitration flow straightening grid device is positioned over brace summer 8(Fig. 2 of the top of the first Catalytic Layer 7 in the SCR reactor 1) on, be positioned at the front end 9 of SCR reactor 1, so that flue gas is after through modularization SCR denitration flow straightening grid device, the flue gas flow direction and the velocity flow profile that are mingled with dust reach ideal effect.
Structure for amplifying of the present invention illustrates in Fig. 2～Fig. 4, as seen from the figure, the vertical grid of described rectification module and the horizontal mutual interconnection of grid are fixed, be the fenestral fabric that a plurality of hollow and thin-walled pipe 6 mutual proper alignment connect, be equipped with whole corral around the described rectification module 2 around fixing frame 5, the axis direction of described hollow and thin-walled pipe 6 is consistent with rectification module 2 short transverses; Described potted component is divided into interior potted component 3 and outer sealing element 4, the gap of interior potted component 3 between described rectification module 2, outer sealing element 4 is between rectification module 2 and SCR reactor 1 inwall, described interior potted component 3 tops are arrow shaped, the angle of drift angle d is no more than 100 ° of (see figure 5)s, outer sealing element 4 tops are half arrow shaped, and the slope of half arrow and vertical direction angle e are no more than 50 ° of (see figure 6)s, described arrow and half arrow towards relative with flue gas flow direction.Described interior potted component 3 and outer sealing element 4 are formed by the compacting of 0.5-2mm thin plate.
Fig. 4 is the local structure for amplifying schematic diagram of single rectification module, and the cross section of diagram hollow and thin-walled pipe 6 is square.During actual the use, described rectification module 2 by 120～180 same sizes, wall thickness is the square hollow and thin-walled pipe 6 of 1.5-3.5mm, be welded and fixed composition by hollow and thin-walled pipe-space, space arrangement, network is square, the band " # " is labeled as the rectangular tube position among Fig. 4, band " x " is labeled as the space (space) of formed objects, connects fixing with the 5 whole corral boxings of lamellar frame around the rectification module.Modularization SCR denitration flow straightening grid device is comprised of along transverse and longitudinal direction proper alignment SCR reactor 1 is interior the rectification module 2 of a plurality of formed objects.The gap of interior potted component 3 between described rectification module 2, the gap of outer sealing element 4 between rectification module 2 and SCR reactor 1 inwall.
The material of described rectification module 2, interior potted component 3 and outer sealing element 4 is metal material.
Above specific description of embodiments of the present invention, is intended to disclose preferred forms of the present invention, makes those of ordinary skill in the art can practice the present invention.But it should be noted that the present invention is not limited to above-mentioned embodiment; enlighten based on the present invention; any apparent conversion or equivalent substitution; the cross section of hollow and thin-walled pipe 6 also can be equilateral triangle cross section or right angled isosceles triangle as described; be welded and fixed by a plurality of hollow and thin-walled pipes-space, space arrangement again, also should be considered to fall into protection scope of the present invention.
Claims (3)
1. modularization SCR denitration flow straightening grid device, comprise a plurality of rectification modules and the potted component that place in the described SCR reactor, it is characterized in that: the vertical grid of described rectification module and the horizontal mutual interconnection of grid are fixed, be the fenestral fabric that the mutual proper alignment of a plurality of hollow and thin-walled pipes connects, be equipped with around fixing frame around the described rectification module, the axis direction of described hollow and thin-walled pipe is consistent with the rectification module short transverse; Described potted component is divided into interior potted component and outer sealing element, the gap of interior potted component between described rectification module, outer sealing element is between rectification module and SCR reactor wall, described interior potted component top is arrow shaped, outer sealing element top is half arrow shaped, described arrow and half arrow towards relative with flue gas flow direction.
2. described modularization SCR denitration flow straightening grid device according to claim 1, it is characterized in that: the cross section of described hollow and thin-walled pipe is square, is arranged by hollow and thin-walled pipe-space, space to be welded and fixed, and consists of square net.
3. described modularization SCR denitration flow straightening grid device according to claim 1, it is characterized in that: the material of described rectification module and potted component is metal material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110136123 CN102240506B (en) | 2011-05-25 | 2011-05-25 | Modular selective catalytic reduction (SCR) denitration rectification grating device |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN 201110136123 CN102240506B (en) | 2011-05-25 | 2011-05-25 | Modular selective catalytic reduction (SCR) denitration rectification grating device |
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| CN102240506A CN102240506A (en) | 2011-11-16 |
| CN102240506B true CN102240506B (en) | 2013-02-27 |
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| CN104313352A (en) * | 2014-11-11 | 2015-01-28 | 宁夏嘉翔自控技术有限公司 | Grid flow guide plate for reducing slag collection box of magnesium metal smelting high-pressure slagging-off and charging integrated machine |
| CN105289303B (en) * | 2015-11-11 | 2017-12-01 | 华南理工大学 | A kind of swirling flow atomizing SCR denitration method and its device |
| CN106246917B (en) * | 2016-09-08 | 2019-03-22 | 苏州西热节能环保技术有限公司 | A kind of SCR denitration module sealing device |
| CN107185908A (en) * | 2017-05-10 | 2017-09-22 | 哈尔滨工程大学 | A kind of soot blower and ash-blowing method in denitrating system rectangle reaction unit peculiar to vessel |
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| US8071037B2 (en) * | 2008-06-25 | 2011-12-06 | Cummins Filtration Ip, Inc. | Catalytic devices for converting urea to ammonia |
| CN201596464U (en) * | 2009-11-26 | 2010-10-06 | 哈尔滨锅炉厂有限责任公司 | Rectifying device for SCR flue gas denitration by selectivity catalysis-reduction method |
| CN202078856U (en) * | 2011-05-25 | 2011-12-21 | 上海龙净环保科技工程有限公司 | Modular SCR (Selective Catalytic Reduction) denitration and rectification grid device |
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