CN106984192B - Coupling SCR denitration guiding device and structure - Google Patents
Coupling SCR denitration guiding device and structure Download PDFInfo
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- CN106984192B CN106984192B CN201710270621.5A CN201710270621A CN106984192B CN 106984192 B CN106984192 B CN 106984192B CN 201710270621 A CN201710270621 A CN 201710270621A CN 106984192 B CN106984192 B CN 106984192B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention provides a coupling SCR denitration guide device and a structure, which have the advantages of reasonable structural design, simple and convenient manufacture, small pressure drop, no dust accumulation and blockage on the surface and integration of rectification and guide functions. The flow guiding device is of a bent grid structure and comprises a flow guiding plate and a reinforcing plate; the guide plate is the polylith, and these guide plates superpose in proper order and extend, and two adjacent guide plates pass through the reinforcing plate and fixedly link to each other, and the interval between two adjacent guide plates constitutes the water conservancy diversion passageway, and the vertical height of these guide plates increases progressively in proper order. A flue is arranged in the flue wall, and the catalyst layer is arranged in the flue; the flow guide device is arranged in the flue and is positioned at the corner of the flue above the catalyst layer, and the flow guide plate of the flow guide device is overlapped and extended from the inner corner to the outer corner of the flue corner; the guide plate is obliquely arranged relative to the flue wall.
Description
Technical Field
The invention relates to a coupling SCR denitration guiding device and a structure.
Background
Coal-fired flue gas NO x The harm of (2) is already to the extent that the harm cannot be disregarded, and the current coal-fired flue gas denitration technology mainly comprises the following steps: low nitrogen combustion, selective Catalytic Reduction (SCR), selective non-catalytic reduction (SNCR), and coupled denitration (SNCR + SCR), among others. The coupling denitration (SNCR + SCR) technology is not a simple combination of SNCR and SCR, and is a new technology developed by combining the characteristics of high efficiency of the SCR technology and low investment of the SNCR technology.
NO can be converted by the mode of low-nitrogen combustion + SNCR at the initial stage of a general unit x Down to 100mg/Nm 3 (dry basis, standard, 6% O 2 ) On the other hand, with the stricter and stricter emission standard, especially the ultralow emission standard "50355", namely SO, is proposed in part of important areas 2 、NO x The smoke dust emission concentration is respectively controlled at 50mg/Nm 3 、35mg/Nm 3 And 5mg/Nm 3 In the following, the coupling SCR denitration technology is more and more applied to the engineering of the established SNCR by adding a layer of catalyst at a proper temperature point in the tail flue of the boiler. As shown in fig. 1, the catalyst layer is generally disposed between the upper-stage economizer and the lower-stage economizer. And the aim of further denitration is fulfilled by using the excessive reducing agent sprayed by the original SNCR.
In the coupling SCR denitration, because the excessive reducing agent sprayed by the original SNCR is utilized, the concentration of the reducing agent basically reaches uniform distribution through the full mixing of the long flue from the reducing agent spraying point to the catalyst layer inlet. However, because there is not enough space for separately arranging the rectifying grating and the flow guide plate in the coupled SCR denitration, the flow velocity distribution of the flue gas at the inlet of the catalyst layer is not uniform, especially when encountering the tail flue of the boiler shown in fig. 1, so that the development of a coupled SCR denitration flow guide technology integrating the rectifying and flow guide functions is urgent.
Chinese patent with application number 201120051345.1 discloses a flue gas all mixes device before SCR entry in SNCR/SCR combined denitration system, it is equipped with circular arc board water conservancy diversion layer and straight board water conservancy diversion layer, flue gas stream loops through circular arc board water conservancy diversion layer and straight board water conservancy diversion layer, form vortex and subregion vortex intensive mixing along the length direction of flue cross-section, make reductant and the nitrogen oxide intensive mixing in coming from furnace SNCR system flue gas, great improvement flue back end SCR denitration's efficiency. The function is to mix the smoke uniformly without rectification and diversion.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a coupling SCR denitration guide device and a coupling SCR denitration guide structure, which have the advantages of reasonable structural design, simple and convenient manufacture, small pressure drop, no ash deposition and blockage on the surface and integration of rectification and guide functions.
The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a coupling SCR denitration guiding device which characterized in that: the flow guiding device is of a bent grid structure and comprises a flow guiding plate and a reinforcing plate; the guide plate is the polylith, and these guide plates superpose in proper order and extend, and two adjacent guide plates pass through the reinforcing plate fixed linking to each other, and the interval between two adjacent guide plates constitutes the water conservancy diversion passageway, and the vertical height of these guide plates increases progressively in proper order.
The number of the guide plates is 29, and the vertical heights of the guide plates are from a first guide plate to a twenty-ninth guide plate from low to high; in the first guide plate to the fourth guide plate, the vertical height difference between every two adjacent guide plates is 50mm; the vertical height difference between the fourth guide plate and the fifth guide plate is 45mm; the vertical height difference between every two adjacent guide plates is 40mm from the fifth guide plate to the eighth guide plate; in the eighth guide plate to the tenth guide plate, the vertical height difference between every two adjacent guide plates is 35mm; in the ten-guide plate to the fourteen-guide plate, the vertical height difference between every two adjacent guide plates is 30mm; in the fourteen-to-sixteen guide plates, the vertical height difference between every two adjacent guide plates is 25mm; in the sixteenth guide plate to the nineteen guide plates, the vertical height difference between every two adjacent guide plates is 20mm; in the nineteen-twenty-first guide plates, the vertical height difference between every two adjacent guide plates is 15mm; in the twenty-first to twenty-ninth air deflectors, the vertical height difference between every two adjacent air deflectors is 10mm.
The guide plate is in a strip shape, the width of the guide plate is 200mm, the thickness of the guide plate is 6mm, and the guide plate is made of Q345.
The reinforcing plate is of a block-shaped structure, is 6mm thick and is made of Q345 and arranged between two adjacent guide plates.
A coupling SCR denitration diversion structure comprises a catalyst layer and a flue wall, wherein a flue is arranged in the flue wall, and the catalyst layer is arranged in the flue; the method is characterized in that: the device also comprises a flow guide device; the flow guide device is arranged in the flue and is positioned at the corner of the flue above the catalyst layer, and the flow guide plate of the flow guide device is overlapped and extended from the inner corner to the outer corner of the flue; the guide plate is obliquely arranged relative to the flue wall.
The included angle between the guide plate and the flue wall is 5 degrees.
Compared with the prior art, the invention has the following advantages and effects: (1) The raw materials can be directly welded for use without special bending; (2) The rectification and flow guiding effects are achieved by micro-adjustment of the angle and the vertical height between the guide plates; (3) The whole structure of the flow guide device mutually serves as a pivot, and the flow guide device is only welded on the flue wall through two ends in the long direction without excessive support; (4) The pressure drop of the whole denitration system generated by the flow guide device is small, and the flow field is smooth; (5) The dust is not accumulated and blocked, and the high-dust-content smoke is protected from abrasion; (6) The mechanical and chemical service life of the catalyst can be prolonged, and the overall availability of the denitration system can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a coupling SCR denitration diversion structure according to an embodiment of the present invention, and an arrow in the diagram indicates a flue gas flow direction.
Fig. 2 is a partial structural view of fig. 1, in which arrows indicate the flow direction of the flue gas.
Fig. 3 is a schematic structural diagram of a flow guide device according to an embodiment of the present invention.
FIG. 4 is a velocity distribution diagram of the inlet flue of the catalyst layer after the flow guide device is installed.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Referring to fig. 1-3, the deflector 32 of the present embodiment is a curved grid structure that includes a deflector and a stiffener 30.
The guide plate is the polylith, and these guide plates superpose in proper order and extend, and two adjacent guide plates pass through reinforcing plate 30 fixed linking to each other, and the interval between two adjacent guide plates constitutes the water conservancy diversion passageway. The vertical heights of the guide plates are sequentially increased progressively, the whole guide plates are in a curve trend of ascending firstly and then being gentle, and therefore when smoke flows to a turn at the turn of a flue, the smoke is guided into a guide flow channel from a low layer to a high layer by the part of each guide plate higher than the front guide plate, and the rectification and guide effects are achieved.
In this embodiment, the guide plate is 29, and vertical height is guide plate 1 to No. twenty-nine guide plate 29 in proper order from low to high. In the first guide plate 1 to the fourth guide plate 4, the vertical height difference between every two adjacent guide plates is 50mm; the vertical height difference between the fourth guide plate 4 and the fifth guide plate 5 is 45mm; in the fifth guide plate 5 to the eighth guide plate 8, the vertical height difference between every two adjacent guide plates is 40mm; in the eighth guide plate 8 to the tenth guide plate 10, the vertical height difference between every two adjacent guide plates is 35mm; in the tenth guide plate 10 to the fourteenth guide plate 14, the vertical height difference between every two adjacent guide plates is 30mm; in the fourteen-to-sixteen guide plates 14 to 16, the vertical height difference between every two adjacent guide plates is 25mm; in the sixteen guide plates 16 to the nineteen guide plates 19, the vertical height difference between every two adjacent guide plates is 20mm; in the nineteen guide plates 19 to the twenty-first guide plate 21, the vertical height difference between every two adjacent guide plates is 15mm; in the twenty-first guide plate 21 to the twenty-ninth guide plate 29, the vertical height difference between every two adjacent guide plates is 10mm.
The guide plate is a strip, the length of the guide plate is determined by the length of the flue, the width of the guide plate is 200mm, the thickness of the guide plate is 6mm, and the guide plate is made of Q345.
The reinforcing plate 30 is of a block structure, the thickness of the reinforcing plate is 6mm, and the material Q345 is arranged between two adjacent guide plates.
The coupling SCR denitration guide structure of this embodiment includes an upper-stage economizer 31, a guide device 32, a catalyst layer 33, a lower-stage economizer 34, and a flue wall 35.
A flue is provided in the flue wall 35.
The upper-stage economizer 31, the catalyst layer 33 and the lower-stage economizer 34 are sequentially arranged in the flue along the flow direction of flue gas.
The guiding device 32 is arranged in the flue, and two ends of the guiding device in the length direction are directly welded and fixed on the flue wall 35, so that the integral fixing effect is achieved. The guide plate is the slope setting for flue wall 35, and the guide plate is 5 with the contained angle of flue wall 35.
The flow guide device 32 is located at the flue corner above the catalyst layer 33, and the flow guide plate of the flow guide device is overlapped and extended from the inner corner to the outer corner of the flue corner, so that the flue corner can be covered. The flue gas flows to the bend at the bend of the flue.
When the flue gas passes through the flow guide device 32 at the turn of the flue from the upper-level economizer 31, the flow velocity of the flue gas is adjusted, the flue gas from the flow guide channel smoothly and uniformly flows through the surface of the catalyst layer 33 to realize the optimal denitration performance, and finally the flue gas flows out through the lower-level economizer 34.
As shown in fig. 4, after the flow guide device 32 is added, the average flow velocity of the flue gas on the surface of the catalyst layer 33 is 5.1m/s, and the relative deviation of the flow velocity is 12.1%, so that the design requirements are met, the possibility of impact of the uneven flue gas on the catalyst layer 33 is reduced, and the mechanical and chemical life of the catalyst is prolonged.
The above description is only illustrative of the structure of the present invention; moreover, the invention may also be said to consist in different parts, and all equivalent or simple variations of the constructions, features and principles described in the patent concepts are intended to be covered by the present patent.
Claims (5)
1. The utility model provides a coupling SCR denitration guiding device which characterized in that: the flow guiding device is in a bent grid structure and comprises a flow guiding plate and a reinforcing plate; the guide plates are stacked and extend in sequence, two adjacent guide plates are fixedly connected through the reinforcing plate, the space between the two adjacent guide plates forms a guide channel, and the vertical heights of the guide plates are sequentially increased; the number of the guide plates is 29, and the vertical heights of the guide plates are from a first guide plate to a twenty-ninth guide plate from low to high; in the first guide plate to the fourth guide plate, the vertical height difference between every two adjacent guide plates is 50mm; the vertical height difference between the fourth guide plate and the fifth guide plate is 45mm; the vertical height difference between every two adjacent guide plates is 40mm from the fifth guide plate to the eighth guide plate; in the eighth guide plate to the tenth guide plate, the vertical height difference between every two adjacent guide plates is 35mm; in the ten-guide plate to the fourteen-guide plate, the vertical height difference between every two adjacent guide plates is 30mm; in the fourteen-to-sixteen guide plates, the vertical height difference between every two adjacent guide plates is 25mm; in the sixteenth guide plate to the nineteen guide plates, the vertical height difference between every two adjacent guide plates is 20mm; in the nineteen-twenty-first guide plates, the vertical height difference between every two adjacent guide plates is 15mm; in the twenty-first to twenty-ninth air deflectors, the vertical height difference between every two adjacent air deflectors is 10mm.
2. The coupled SCR denitration diversion device of claim 1, wherein: the guide plate is rectangular shape, and the width is 200mm, and thickness is 6mm, and the material is Q345.
3. The coupled SCR denitration diversion device of claim 1, wherein: the reinforcing plate is of a block structure, the thickness of the reinforcing plate is 6mm, the material of the reinforcing plate is Q345, and the reinforcing plate is arranged between two adjacent guide plates.
4. A coupling SCR denitration diversion structure comprises a catalyst layer and a flue wall, wherein a flue is arranged in the flue wall, and the catalyst layer is arranged in the flue; the method is characterized in that: further comprising a flow guide device according to any one of claims 1 to 3; the flow guide device is arranged in the flue and is positioned at the corner of the flue above the catalyst layer, and the flow guide plate of the flow guide device is overlapped and extended from the inner corner to the outer corner of the flue corner; the guide plate is obliquely arranged relative to the flue wall.
5. The coupled SCR denitration diversion structure of claim 4, wherein: the included angle between the guide plate and the flue wall is 5 degrees.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710270621.5A CN106984192B (en) | 2017-04-24 | 2017-04-24 | Coupling SCR denitration guiding device and structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710270621.5A CN106984192B (en) | 2017-04-24 | 2017-04-24 | Coupling SCR denitration guiding device and structure |
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| CN106984192A CN106984192A (en) | 2017-07-28 |
| CN106984192B true CN106984192B (en) | 2022-11-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108126499A (en) * | 2018-01-02 | 2018-06-08 | 李卫军 | A kind of desulfation dust-extraction device based on rotating spraying and spiral gas-liquid separation principle |
| CN108704477A (en) * | 2018-07-09 | 2018-10-26 | 刘盈 | A kind of energy saving and environment friendly equipment for denitrifying flue gas and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1057770A (en) * | 1996-08-26 | 1998-03-03 | Babcock Hitachi Kk | Flue gas denitrification device |
| CN101306325A (en) * | 2008-07-07 | 2008-11-19 | 北京博奇电力科技有限公司 | Flue gas even distribution device of selective catalytic reduction reaction denitration reactor |
| CN103007749A (en) * | 2012-12-12 | 2013-04-03 | 盐城工学院 | Guiding device and guiding method for uniformly distributed flow field of pi type SCR (Selective Catalytic Reduction) denitrification reactor |
| CN103736394A (en) * | 2014-01-02 | 2014-04-23 | 上海交通大学 | Design method of guide plate of reducing flue of SCR (selective catalytic reduction) de-nitration device |
| CN206762661U (en) * | 2017-04-24 | 2017-12-19 | 中国联合工程公司 | Couple SCR denitration guiding device and structure |
-
2017
- 2017-04-24 CN CN201710270621.5A patent/CN106984192B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1057770A (en) * | 1996-08-26 | 1998-03-03 | Babcock Hitachi Kk | Flue gas denitrification device |
| CN101306325A (en) * | 2008-07-07 | 2008-11-19 | 北京博奇电力科技有限公司 | Flue gas even distribution device of selective catalytic reduction reaction denitration reactor |
| CN103007749A (en) * | 2012-12-12 | 2013-04-03 | 盐城工学院 | Guiding device and guiding method for uniformly distributed flow field of pi type SCR (Selective Catalytic Reduction) denitrification reactor |
| CN103736394A (en) * | 2014-01-02 | 2014-04-23 | 上海交通大学 | Design method of guide plate of reducing flue of SCR (selective catalytic reduction) de-nitration device |
| CN206762661U (en) * | 2017-04-24 | 2017-12-19 | 中国联合工程公司 | Couple SCR denitration guiding device and structure |
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Address after: The city of Hangzhou city of Zhejiang Province, 310022 Stonebridge Road No. 338 Applicant after: CHINA UNITED ENGINEERING Corp.,Ltd. Address before: The city of Hangzhou city of Zhejiang Province, 310022 Stonebridge Road No. 338 Applicant before: CHINA UNITED ENGINEERING Corp. |
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