CN203598693U - Wedge-shaped tapered rectifying grating for SCR (selective catalytic reduction) denitration device - Google Patents

Wedge-shaped tapered rectifying grating for SCR (selective catalytic reduction) denitration device Download PDF

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Publication number
CN203598693U
CN203598693U CN201320761635.4U CN201320761635U CN203598693U CN 203598693 U CN203598693 U CN 203598693U CN 201320761635 U CN201320761635 U CN 201320761635U CN 203598693 U CN203598693 U CN 203598693U
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China
Prior art keywords
rectification module
rectifying
fixed
module
row
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CN201320761635.4U
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Chinese (zh)
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张贞良
谢芳
朱晓雅
施平平
顾建权
武玉真
潘晓雪
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浙江蓝天求是环保股份有限公司
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Abstract

The utility model discloses a wedge-shaped tapered rectifying grating for an SCR (silicon controlled rectifier) denitration device. The wedge-shaped tapered rectifying grating comprises a supporting frame with multiple rows and multiple columns of structures, wherein a first rectifying module is fixed at the first column of each row of the supporting frame, and a third rectifying module is fixed at the last column of each row of the supporting frame; second rectifying modules are fixed at all middle columns; the axial heights of the first rectifying module and the third rectifying module are linearly increased progressively; the axial heights of all the second rectifying modules are consistent; the axial heights of the highest position of the first rectifying module and the lowest position of the third rectifying module are equal to those of the second rectifying modules; positioning stopping blocks are fixed at the bottoms of clearances between every two of the first rectifying module, the second rectifying modules and the third rectifying module as well as between each of the first rectifying module, the second rectifying modules and the third rectifying module and the supporting frame, and dustproof baffles are fixed on the tops of the clearances. According to the wedge-shaped tapered rectifying grating for the SCR denitration device, flue gas containing dust can uniformly flow through a catalyst layer in the perpendicular direction, so that abrasion to catalysts can be alleviated; furthermore, the wedge-shaped tapered rectifying grating is convenient to operate; materials can be saved, and the comprehensive investment cost is low.

Description

A kind of wedge shape gradual change type flow straightening grid for SCR denitrification apparatus

Technical field

The utility model relates to a kind of SCR(Selective Catalytic Reduction, SCR) parts of flue gas denitrification system; Relate in particular to a kind of wedge shape gradual change type flow straightening grid device of thermal power plant spray ammonia denitrating system.

Background technology

At present, thermal power plant denitration method for flue gas mainly comprises SCR (SCR) technology, SNCR (SNCR) technology, SNCR/SCR combined denitration technology etc., wherein SCR denitration technology be current application the most extensively, the most effective mainstream technology, denitration efficiency reaches more than 80%.The cardinal principle of SCR denitration technology is, certain density reducing agent ammonia (NH3) is sprayed in flue gas and fully mixed, and the reactor of flowing through generates N2 by NOx reduction under the effect of catalyst, realizes removing of NOx.

Because denitration reaction is to occur the moment contacting with solid catalyst surface at flue gas, and catalyst structure has the particularity (porous media, material more fragile etc.) of himself, therefore the flow field uniformity of SCR denitrating system and velocity flow profile situation are particularly important, directly affect the service life of denitration performance and catalyst.For obtaining good Flow Field Distribution, conventionally arrange different deflector at reactor inlet level connection joint flue, above first floor catalyst, brace summer position is evenly arranged the flow straightening grid of series of identical height, but from denitration cold model experiment and project installation operating experience, because reactor cross section size is larger, deflector installation difficulty is high, it is many that flow straightening grid is made consumptive material, and the flying dust in flue gas is easily deposited on surface, thereby the cost that increases installation and system operation, finally affects denitration performance.

Summary of the invention

The purpose of this utility model is for the technical deficiency part of (comprising reactor inlet deflector and flow straightening grid) of fairing in existing Benitration reactor, a kind of wedge shape gradual change type flow straightening grid for SCR denitrification apparatus is provided, not only can save reactor inlet deflector, can also simplify existing flow straightening grid, meet the requirements such as flow field uniformity, simple in structure, easy for installation, consumptive material is low.

The purpose of this utility model is achieved through the following technical solutions: a kind of wedge shape gradual change type flow straightening grid for SCR denitrification apparatus, it is characterized in that, it comprises that one has the bracing frame of many row's multiple row structures, each row's of bracing frame first row is fixed the first rectification module, last row are fixed the 3rd rectification module, middle all row are fixed the second rectification module, the axial height linear increment of the first rectification module and the 3rd rectification module, the axial height of all the second rectification modules is consistent, and the highest point of the first rectification module, the lowest part of the 3rd rectification module equates with the axial height of the second rectification module, the bottom fixed position block in the first rectification module, the second rectification module and the 3rd rectification module gap each other and between the first rectification module, the second rectification module and the 3rd rectification module and bracing frame, accumulatingdust baffle plate is fixed at top.

Further, described the first rectification module, the second rectification module and the 3rd rectification module include one and weld by four block plates the framework forming, the some steel plates of parallel welding in framework, between the top of framework and the top of steel plate and all weld many root beads between the bottom of framework and the bottom of steel plate and connect round steel.

The beneficial effects of the utility model are, flue gas enters reactor through level connection joint flue, reactor inlet place is without deflector is set separately, directly flow through after wedge shape gradual change type flow straightening grid of the present utility model, can flow through catalyst layer with vertical direction more uniformly, meet the denitration flow field requirement of regulation in " coal-fired flue gas denitration technical equipment " (GBT 21509-2008), first floor catalyst top velocity deviation < 15%, NH3/NOx mol ratio deviation < 5%, flow to deviation and be less than 10 °, thereby guarantee the denitration performance of SCR system.

Accompanying drawing explanation

Fig. 1 is installation site of the present utility model and denitrating system front view;

Fig. 2 is top view of the present utility model;

Fig. 3 is that A-A of the present utility model is to structural representation;

Fig. 4 is that B-B of the present utility model is to structural representation;

Fig. 5 is I partial structurtes enlarged diagrams;

Fig. 6 is II partial structurtes enlarged diagrams;

Fig. 7 is III partial structurtes enlarged diagrams;

In figure, ammonia-spraying grid 1, flue deflector 2, flow straightening grid 3, SCR reactor 4, catalyst layer 5, the first rectification module 6, the second rectification module 7, the 3rd rectification module 8, accumulatingdust baffle plate 9, welding round steel 10, position block 11, bracing frame 12.

The specific embodiment

Further illustrate the utility model below in conjunction with the drawings and specific embodiments; the present embodiment carries out under take technical solutions of the utility model as prerequisite; provided concrete embodiment and detailed result of implementation, but protection domain of the present utility model is not limited to following examples of implementation.

The utility model provides a kind of wedge shape gradual change type flow straightening grid for SCR denitrification apparatus, and its profile and structure are as shown in Fig. 1-Fig. 7.Fig. 1 is certain SCR of 300MW coal-burning power plant denitrification apparatus entirety flue and reactor, and its reactor outer wall dimension is: width 8000 × degree of depth 11900 × wall thickness 200mm.The present invention is placed in the top of SCR reactor 4 for the wedge shape gradual change type flow straightening grid of SCR denitrification apparatus, the flue gas flow direction of SCR reactor 4 is axial direction.This wedge shape gradual change type flow straightening grid that is used for SCR denitrification apparatus comprises that one has the bracing frame 12 of many row's multiple row structures, bracing frame 12 each row's first row is fixed the first rectification module 6, last row are fixed the 3rd rectification module 8, middle all row are fixed the second rectification module 7, linear the increasing progressively of axial height of the first rectification module 6 and the 3rd rectification module 8, the axial height of the second rectification module 7 equates, and the lowest part of the highest point of the first rectification module 6, the 3rd rectification module 8 equates with the axial height of the second rectification module 7.The bottom fixed position block 11 in the first rectification module 6, the second rectification module 7 and the 3rd rectification module 8 gap each other and between the first rectification module 6, the second rectification module 7 and the 3rd rectification module 8 and bracing frame 12, accumulatingdust baffle plate 9 is fixed at top.

The structure of the first rectification module 6, the second rectification module 7 and the 3rd rectification module 8 is basically identical, include the framework that the Plate Welding that is 6mm by four thickness forms, the steel plate that in framework, the some thickness of parallel welding is 3mm, between the top of framework and the top of steel plate and all weld many root beads between the bottom of framework and the bottom of steel plate and connect round steel 10, play fixation.

As shown in Figure 1, the course of work of the present invention is as follows: the reducing agent ammonia that the flue gas flowing into from smoke inlet sprays with ammonia-spraying grid 1 mixes, mixed flue gas enters reactor 4 more uniformly through flue deflector 2, flow straightening grid 3 after optimizing and revising, the catalyst layer 5 of flowing through successively, issue raw reduction reaction in the effect of catalyst, NOx in flue gas also to be become to N2, realize SCR denitrification process.

Result of implementation of the present utility model: flue gas enters reactor, without deflector is set separately, the above-mentioned wedge shape gradual change type flow straightening grid of directly flowing through, through rectification and the optimization of flow straightening grid, above catalyst layer, form comparatively ideal flue gas flow rate and flow to distribution, velocity deviation < 15%, NH3/NOx mol ratio deviation < 5%, flow to deviation and be less than 10 °, make flue gas to flow through catalyst layer with vertical direction more uniformly, reduce catalyst abrasion; Accumulatingdust baffle plate cannot deposit the dust in flue gas on flow straightening grid and brace summer, thereby has improved the denitration performance of SCR system; Meanwhile, wedge shape flow straightening grid is without reactor inlet deflector is set separately, and realizes modularization and install, easy to operate, material economy, and comprehensive method of investment cost is low.

The above, be only preferred embodiment of the present utility model, not structure of the present utility model done to any pro forma restriction.Any simple modification, equivalent variations and modification that every foundation technical spirit of the present utility model is done above examples of implementation, all fall in protection domain of the present utility model.

Claims (2)

1. the wedge shape gradual change type flow straightening grid for SCR denitrification apparatus, it is characterized in that, it comprises that one has the bracing frame (12) of many row's multiple row structures, each row's of bracing frame (12) first row is fixed the first rectification module (6), last row are fixed the 3rd rectification module (8), middle all row are fixed the second rectification module (7), linear the increasing progressively of axial height of the first rectification module (6) and the 3rd rectification module (8), the axial height of all the second rectification modules (7) is consistent, and the highest point of the first rectification module (6), the lowest part of the 3rd rectification module (8) equates with the axial height of the second rectification module (7), the bottom fixed position block (11) in the first rectification module (6), the second rectification module (7) and the 3rd rectification module (8) gap each other and between the first rectification module (6), the second rectification module (7) and the 3rd rectification module (8) and bracing frame (12), accumulatingdust baffle plate (9) is fixed at top.
2. according to claim 1 for the wedge shape gradual change type flow straightening grid of SCR denitrification apparatus, it is characterized in that, described the first rectification module (6), the second rectification module (7) and the 3rd rectification module (8) include one and weld by four block plates the framework forming, the some steel plates of parallel welding in framework, all weld many root beads between the top of framework and the top of steel plate and between the bottom of framework and the bottom of steel plate and connect round steel (10).
CN201320761635.4U 2013-11-27 2013-11-27 Wedge-shaped tapered rectifying grating for SCR (selective catalytic reduction) denitration device CN203598693U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104624072A (en) * 2015-02-11 2015-05-20 中国华能集团公司 Flue gas premixing device and denitration reactor and method based on same
CN105561784A (en) * 2016-02-26 2016-05-11 北京峰业电力环保工程有限公司 Rectifying grille device for denitration technology
CN105771642A (en) * 2016-04-29 2016-07-20 大唐环境产业集团股份有限公司 Horizontal SCR (selective catalytic reduction) denitration reactor
CN106237839A (en) * 2016-08-25 2016-12-21 东方电气集团东方锅炉股份有限公司 Accumulatingdust disturbing flow device for the notch cuttype bilayer fairing of SCR denitration
US20190257233A1 (en) * 2018-02-17 2019-08-22 Cormetech, Inc. Diffuser assemblies and catalytic reactors comprising the same
WO2020171200A1 (en) * 2019-02-21 2020-08-27 三菱日立パワーシステムズ株式会社 Denitration device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104624072A (en) * 2015-02-11 2015-05-20 中国华能集团公司 Flue gas premixing device and denitration reactor and method based on same
CN105561784A (en) * 2016-02-26 2016-05-11 北京峰业电力环保工程有限公司 Rectifying grille device for denitration technology
CN105771642A (en) * 2016-04-29 2016-07-20 大唐环境产业集团股份有限公司 Horizontal SCR (selective catalytic reduction) denitration reactor
CN106237839A (en) * 2016-08-25 2016-12-21 东方电气集团东方锅炉股份有限公司 Accumulatingdust disturbing flow device for the notch cuttype bilayer fairing of SCR denitration
CN106237839B (en) * 2016-08-25 2019-05-21 东方电气集团东方锅炉股份有限公司 The accumulatingdust disturbing flow device of the double-deck fairing of step type for SCR denitration
US20190257233A1 (en) * 2018-02-17 2019-08-22 Cormetech, Inc. Diffuser assemblies and catalytic reactors comprising the same
US10690035B2 (en) * 2018-02-17 2020-06-23 Cormetech, Inc. Diffuser assemblies and catalytic reactors comprising the same
WO2020171200A1 (en) * 2019-02-21 2020-08-27 三菱日立パワーシステムズ株式会社 Denitration device

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