CN202460472U - Double-layer ammonia injection grid used in industrial flue gas selective catalytic reduction (SCR) denitration device and having zone adjustment function - Google Patents
Double-layer ammonia injection grid used in industrial flue gas selective catalytic reduction (SCR) denitration device and having zone adjustment function Download PDFInfo
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- CN202460472U CN202460472U CN2012200017761U CN201220001776U CN202460472U CN 202460472 U CN202460472 U CN 202460472U CN 2012200017761 U CN2012200017761 U CN 2012200017761U CN 201220001776 U CN201220001776 U CN 201220001776U CN 202460472 U CN202460472 U CN 202460472U
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Abstract
The utility model relates to the technical field of industrial flue gas selective catalytic reduction (SCR) denitration, in particular to a double-layer ammonia injection grid used in an SCR denitration device and having a zone adjustment function. Aiming at the problems that denitration efficiency is influenced, the escape rate of ammonia is increased and the like because the ammonia is non-uniformly distributed on a flue section of the conventional ammonia injection grid, the flue section is equally divided into two zones, the ammonia injection function of one zone (namely half of flue section area) is realized by one of an upper ammonia injection grid and a lower ammonia injection grid, and the ammonia injection amount of each zone is adjusted and controlled by an ammonia injection adjusting valve according to the distribution law of flue gas flow velocities of the two zones of the flue section and different concentrations of NOx in flue gas, so that the ammonia injection amount of the zones of the flue section is adjustable, an effect of uniformly mixing the ammonia and the NOx in the flue gas is optimized, the denitration efficiency is improved, and the escape rate of the ammonia is effectively reduced. The ammonia injection grid has a good effect of uniformly mixing the NOx in the flue gas and the ammonia, improves the denitration efficiency, effectively reduces the escape rate of the ammonia, and is suitable for an industrial NOx SCR denitration device in coal firing industry, metallurgical industry, chemical industry and the like.
Description
Technical field
The utility model relates to the selective-catalytic-reduction denitrified technical field of industrial smoke, relates in particular to be used for the double-deck ammonia-spraying grid that selective catalytic reduction denitration device has the subregion regulatory function.
Background technology
Selective catalytic reduction (SCR) is used widely in the nitrogen-containing oxide industrial flue gas cleaning of industries such as big-and-middle-sized power station, metallurgy, chemical industry is handled removing characteristics such as the maturation that possesses skills aspect the nitrogen oxide (NOx), removal efficiency are high, stable, non-secondary pollution thing at present.
Selective catalytic reduction generally selects for use ammoniacal liquor or liquefied ammonia as reducing agent, and with its with spray in the Benitration reactor front end flue after air mixes.Designing and adopting rational ammonia-spraying grid is mixing and the distribution effect that guarantees nitrogen oxide in ammonia and the flue gas, the key factor that reduces the escaping of ammonia rate, raising denitration efficiency and effect.
In selective catalytic reduction device, generally adopt at present the ammonia-spraying grid of individual layer arrangement form, ammonia-spraying grid is made up of parallel several spray ammonia pipes, has some spray ammonia hole on the every spray ammonia pipe.This design and arrangement form make the ammonia spraying amount that sprays the ammonia hole on the every spray ammonia pipe differ bigger; Cause the distributed pole of ammonia on the flue cross section inhomogeneous; The inhomogeneities that flue gas flow rate distributes on the flue cross section has in addition had a strong impact on the raising of denitration efficiency, and has increased the escaping of ammonia rate.
Summary of the invention
The purpose of the utility model is different according to NOx concentration in the regularity of distribution of flue cross section flue gas flow rate and the flue gas; Design and provide double-deck ammonia-spraying grid with subregion regulatory function; Make ammonia spraying amount subregion on the flue cross section adjustable; Optimize the mix uniformly effect of nitrogen oxide in ammonia and the flue gas, improved denitration efficiency, and effectively reduced the escaping of ammonia rate.
For achieving the above object, the double-deck ammonia-spraying grid of the utility model is made up of upper strata ammonia-spraying grid and lower floor's ammonia-spraying grid.Upper strata ammonia-spraying grid and lower floor's ammonia-spraying grid spacing are 400mm-500mm.Upper strata ammonia-spraying grid and lower floor's ammonia-spraying grid are formed by spray ammonia control valve, the female pipe of spray ammonia, spray ammonia arm, the spray ammonia flow of the female pipe of each spray ammonia control valve control 1 spray ammonia, and connect 5 spray ammonia arms.The spray ammonia arm of upper strata ammonia-spraying grid and lower floor's ammonia-spraying grid equidistantly is arranged in parallel, and spacing is confirmed according to the flue sectional area, is generally 200mm-250mm.
It is identical with the flue cross-sectional width that the spray ammonia of described upper strata ammonia-spraying grid props up length of tube, promptly sprays the ammonia arm and be distributed in whole flue cross section.Back 1/2 section of spray ammonia arm is uniformly distributed with and offers spray ammonia hole, and spray aperture, ammonia hole is 8mm-20mm.
The spray ammonia of described lower floor ammonia-spraying grid props up length of tube and is equivalent to 1/2 of flue cross-sectional width, promptly sprays the ammonia arm and is distributed in 1/2 flue cross section.Spray ammonia arm all is uniformly distributed with offers spray ammonia hole, and spray aperture, ammonia hole is 8mm-20mm.
The spray ammonia branch diameter of described upper strata ammonia-spraying grid and lower floor's ammonia-spraying grid is 60mm-80mm.
With existing ammonia-spraying grid compared with techniques, the utlity model has following characteristics:
(1) the flue cross section is divided into 2 subregions, respectively bears 1 subregion (i.e. 1/2 flue sectional area) spray ammonia function by last ammonia-spraying grid and following ammonia-spraying grid.Different according to NOx concentration in the regularity of distribution of 2 subregion flue cross section flue gas flow rates and the flue gas; Regulate and control the ammonia spraying amount of each subregion through spray ammonia control valve; Make ammonia spraying amount subregion on the flue cross section adjustable; Optimize the mix uniformly effect of nitrogen oxide in ammonia and the flue gas, improved denitration efficiency, and effectively reduced the escaping of ammonia rate.
(2) according to the difference of each subregion ammonia spraying amount, the tube pitch of spray ammonia arm can be provided with between 200mm-250mm, and spray ammonia branch diameter can be provided with between 60mm-80mm, and spray ammonia arm spray aperture, ammonia hole can be selected in the 8mm-20mm scope.
(3) ammonia that ammonia-spraying grid sprays following ammonia-spraying grid on the utility model has also played the effect of strengthening hybrid perturbation, makes the more even distribution of ammonia in flue gas.
Description of drawings
Below in conjunction with accompanying drawing the utility model is done further to specify.
Fig. 1 is the double-deck ammonia-spraying grid profile of the utility model patent;
Fig. 2 is the upper strata ammonia-spraying grid plane of the utility model patent;
Fig. 3 is lower floor's ammonia-spraying grid plane of the utility model patent.
Among the figure: 1. upper strata ammonia-spraying grid, 2. lower floor's ammonia-spraying grid, 3. upper strata spray ammonia control valve, the 4. female pipe of upper strata spray ammonia, 5. upper strata spray ammonia arm, 6. upper strata spray ammonia hole, 7. lower floor's spray ammonia control valve, the 8. female pipe of lower floor's spray ammonia, 9. lower floor's spray ammonia arm, 10. lower floor's spray ammonia hole.
The specific embodiment
Fig. 1 is ammonia-spraying grid (1) and vertical being arranged on the flue cross section after the flue inwall is connected at the middle and upper levels, and is covered with whole flue cross section.Lower floor's ammonia-spraying grid (2) and vertical being arranged on the flue cross section after the flue inwall is connected, and be covered with 1/2 flue cross section.Upper strata ammonia-spraying grid (1) is 400mm-500mm with lower floor's ammonia-spraying grid (2) spacing.
The upper strata ammonia-spraying grid (1) of the utility model is formed by spray ammonia control valve (3,7), the spray female pipe of ammonia (4,8), spray ammonia arm (5,9) with lower floor's ammonia-spraying grid (2).The spray ammonia flow of each spray ammonia control valve (3,7) control 1 spray female pipe of ammonia (4,8), and connect 5 spray ammonia arms (5,9).The spray ammonia arm (5,9) of upper strata ammonia-spraying grid (1) and lower floor's ammonia-spraying grid (2) equidistantly is arranged in parallel, and spacing is confirmed according to the flue sectional area, is generally 200mm-250mm.
Spray ammonia arm (5) length of the upper strata ammonia-spraying grid (1) of the utility model is identical with the flue cross-sectional width; Promptly spray ammonia arm (5) and be distributed in whole flue cross section; The spray ammonia arm (5) back 1/2 section be uniformly distributed with offer the spray ammonia hole (6), the spray aperture, ammonia hole (6) be 8mm-20mm.Spray ammonia arm (9) length of lower floor's ammonia-spraying grid (2) is equivalent to 1/2 of flue cross-sectional width, promptly sprays ammonia arm (9) and is distributed in 1/2 flue cross section, and spray ammonia arm (9) all is uniformly distributed with offers spray ammonia hole (10), and spray aperture, ammonia hole (10) is 8mm-20mm.
In the utility model implementation process, the flue cross section is divided into 2 subregions, respectively bears the spray ammonia function of 1 subregion (i.e. 1/2 flue sectional area) by last ammonia-spraying grid (1) and following ammonia-spraying grid (2).Different according to NOx concentration in the regularity of distribution of 2 subregion flue cross section flue gas flow rates and the flue gas; Regulate and control the ammonia spraying amount of each subregion through spray ammonia control valve; Make ammonia spraying amount subregion on the flue cross section adjustable; Optimize the mix uniformly effect of nitrogen oxide in ammonia and the flue gas, improved denitration efficiency, and effectively reduced the escaping of ammonia rate.
In the utility model implementation process, last ammonia-spraying grid has also played the effect of strengthening hybrid perturbation to the ammonia of ammonia-spraying grid ejection down, makes the more even distribution of ammonia in flue gas.
The utility model is good to the mix uniformly effect of nitrogen oxide in the flue gas and ammonia, has improved denitration efficiency, and effectively reduces the escaping of ammonia rate, is applicable to the NOx selective catalytic reduction denitration device of industry such as fire coal, metallurgy and chemical industry.
The above-mentioned embodiment that only combines accompanying drawing exemplarily to describe the utility model patent, but the concrete realization of the utility model patent is not limited to aforesaid way.Any unsubstantiality that the technical scheme of the utility model patent is carried out is changed the protection domain that all should be regarded as the utility model patent.
Claims (5)
1. be used for the double-deck ammonia-spraying grid that the industrial smoke selective catalytic reduction denitration device has the subregion regulatory function, it is characterized in that: double-deck ammonia-spraying grid is made up of upper strata ammonia-spraying grid and lower floor's ammonia-spraying grid.
2. according to claim 1ly be used for the double-deck ammonia-spraying grid that the industrial smoke selective catalytic reduction denitration device has the subregion regulatory function; It is characterized in that: upper strata ammonia-spraying grid and lower floor's ammonia-spraying grid are formed by spray ammonia control valve, the female pipe of spray ammonia, spray ammonia arm; The spray ammonia flow of the female pipe of each spray ammonia control valve control 1 spray ammonia, and connect 5 spray ammonia arms.
3. according to claim 1ly be used for the double-deck ammonia-spraying grid that the industrial smoke selective catalytic reduction denitration device has the subregion regulatory function; It is characterized in that: it is identical with the flue cross-sectional width that the spray ammonia of upper strata ammonia-spraying grid props up length of tube; Promptly spray the ammonia arm and be distributed in whole flue cross section, back 1/2 section of spray ammonia arm is uniformly distributed with and offers spray ammonia hole.
4. according to claim 1ly be used for the double-deck ammonia-spraying grid that the industrial smoke selective catalytic reduction denitration device has the subregion regulatory function; It is characterized in that: the spray ammonia of lower floor's ammonia-spraying grid props up length of tube and is equivalent to 1/2 of flue cross-sectional width; Promptly spray the ammonia arm and be distributed in 1/2 flue cross section, spray ammonia arm all is uniformly distributed with offers spray ammonia hole.
5. according to claim 2ly be used for the double-deck ammonia-spraying grid that the industrial smoke selective catalytic reduction denitration device has the subregion regulatory function; It is characterized in that: the tube pitch of spray ammonia arm can be provided with between 200mm-250mm; Spray ammonia branch diameter can be provided with between 60mm-80mm, and spray ammonia arm spray aperture, ammonia hole can be selected in the 8mm-20mm scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200017761U CN202460472U (en) | 2012-01-05 | 2012-01-05 | Double-layer ammonia injection grid used in industrial flue gas selective catalytic reduction (SCR) denitration device and having zone adjustment function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200017761U CN202460472U (en) | 2012-01-05 | 2012-01-05 | Double-layer ammonia injection grid used in industrial flue gas selective catalytic reduction (SCR) denitration device and having zone adjustment function |
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| CN202460472U true CN202460472U (en) | 2012-10-03 |
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| CN2012200017761U Expired - Lifetime CN202460472U (en) | 2012-01-05 | 2012-01-05 | Double-layer ammonia injection grid used in industrial flue gas selective catalytic reduction (SCR) denitration device and having zone adjustment function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527233A (en) * | 2012-01-05 | 2012-07-04 | 北京龙电宏泰环保科技有限公司 | Zoning-regulating double-layer ammonia injection grid applied to selective catalytic reduction denitrification device for industrial flue gas |
| CN108499359A (en) * | 2018-05-15 | 2018-09-07 | 华电电力科学研究院有限公司 | A kind of whirlpool of automatic adjustment is mixed and anti-blocking ammonia-spraying grid device and its application process |
-
2012
- 2012-01-05 CN CN2012200017761U patent/CN202460472U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527233A (en) * | 2012-01-05 | 2012-07-04 | 北京龙电宏泰环保科技有限公司 | Zoning-regulating double-layer ammonia injection grid applied to selective catalytic reduction denitrification device for industrial flue gas |
| CN108499359A (en) * | 2018-05-15 | 2018-09-07 | 华电电力科学研究院有限公司 | A kind of whirlpool of automatic adjustment is mixed and anti-blocking ammonia-spraying grid device and its application process |
| CN108499359B (en) * | 2018-05-15 | 2023-11-03 | 华电电力科学研究院有限公司 | Automatic-adjusting vortex-mixing anti-blocking ammonia spraying grid device and application method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121003 |
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| CX01 | Expiry of patent term |