CN214345531U - Compressed air intervention device for improving SNCR (Selective non catalytic reduction) denitration efficiency and SNCR denitration system - Google Patents
Compressed air intervention device for improving SNCR (Selective non catalytic reduction) denitration efficiency and SNCR denitration system Download PDFInfo
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- CN214345531U CN214345531U CN202022994861.XU CN202022994861U CN214345531U CN 214345531 U CN214345531 U CN 214345531U CN 202022994861 U CN202022994861 U CN 202022994861U CN 214345531 U CN214345531 U CN 214345531U
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Abstract
The utility model discloses a compressed air intervenes device and SNCR deNOx systems for promoting SNCR denitration efficiency, including the tuber pipe, the entry end of tuber pipe is connected with the air supply output, and the exit end of tuber pipe sets up the gas injector head, and the tuber pipe passes the flue wall, and the terminal surface of gas injector head is parallel and level with flue wall surface, and the central line of tuber pipe and the central line of denitration spray gun body are located same level; the utility model provides a compressed air intervention device for improving SNCR denitration efficiency, which can utilize compressed air to spray and blow off dense flying ash at the front end of a denitration device, and improve the denitration efficiency of the SNCR device; the device can effectively reduce the influence of the flying ash concentration of the circulating fluidized bed on the SNCR denitration efficiency, enhance the coal adaptability of the unit, reduce the abrasion of the flying ash wall flow to the spray gun and the sleeve, prolong the service life of the denitration system and reduce the maintenance cost.
Description
Technical Field
The utility model belongs to the technical field of circulating fluidized bed boiler selectivity non-catalytic reduction method (SNCR) denitration application, concretely relates to compressed air intervention device and SNCR deNOx systems for promoting SNCR denitration efficiency.
Background
At present, SNCR denitration is a mainstream denitration technology, and the denitration efficiency is generally 50-80%. Due to low investment and low operation cost, the SNCR denitration technology is particularly suitable for medium and small-capacity boilers, and particularly has good comprehensive cost performance when being applied to circulating fluidized bed boilers.
The SNCR denitration technology is characterized in that an amino reducing agent (such as ammonia water or a urea solution) solution is atomized into liquid drops by a spray gun and sprayed into high-temperature flue gas (850-1050 ℃) in a hearth or other parts, gaseous NH3 is generated by pyrolysis, and NH3 and NOx perform selective non-catalytic reduction reaction under the condition of not adding a catalyst, so that NOx is reduced into N2 and H2O.
The horizontal flue gas-solid two-phase flow is severely disturbed, and the temperature range is 850-1050 ℃, so that the horizontal flue gas-solid two-phase flow is often used as an installation position of an SNCR spray gun. However, the flow velocity of flue gas in the horizontal flue is larger, about 25-30 m/s, and the concentration of flue gas fly ash is higher, about 15000-20000 mg/m 3. Liquid drops sprayed by the SNCR denitration device are easily affected by adherence of fly ash and cannot fully react with NOx in flue gas, so that the SNCR denitration efficiency is affected.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a compressed air intervenes device and SNCR deNOx systems for promoting SNCR denitration efficiency can weaken flying dust concentration around the spray gun effectively, reduces flying dust adhesion to improve the denitration efficiency of SNCR method, further reduce NOxAnd (5) discharging.
In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a device is intervene to compressed air for promoting SNCR denitration efficiency, includes the tuber pipe, and the air supply output is connected to the entry end of tuber pipe, and the exit end of tuber pipe sets up the gas jet head, and the tuber pipe passes the flue wall, and the terminal surface and the flue wall surface parallel and level of gas jet head, the central line of tuber pipe and the central line of denitration spray gun body are located same level.
The pressure at the output end of the air source is higher than 0.15 Mpa.
The air source adopts a denitration device to atomize air or low-quality industrial gas for a power plant.
The outlet of the gas injection head is provided with uniformly distributed gas injection holes, and the aperture of each gas injection hole is 5-10 mm.
The cross-sectional shape of the gas injection head is circular, rectangular or hexagonal.
The cross-sectional area of the gas injection head is 2-3 times of the cross-sectional area of the air pipe.
The space between adjacent gas injection holes of the gas injection head is filled with wear-resistant plastic.
The utility model also provides a SNCR deNOx systems to flue gas flow direction is for referring to in the flue, and the upper reaches of denitration spray gun body set up the utility model compressed air intervenes device.
The compressed air intervention device is 100-150 mm away from the denitration spray gun body.
The compressed air intervention device corresponds to the denitration spray gun one by one.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
the utility model provides a compressed air intervention device for improving SNCR denitration efficiency, which can utilize compressed air to spray and blow off dense flying ash at the front end of a denitration device, and improve the denitration efficiency of the SNCR device; the device can effectively reduce the influence of the flying ash concentration of the circulating fluidized bed on the SNCR denitration efficiency, enhance the coal adaptability of the unit, reduce the abrasion of the flying ash wall flow on the spray gun and the sleeve, prolong the service life of the denitration system and reduce the maintenance cost; the added device is simple, the increase of one path of compressed air can be realized, and the utilization rate of the existing equipment can be improved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the attached drawings, 1, a denitration reducing agent solution interface; 2. a denitration atomizing air interface; 3. a spray gun cooling air interface; 4. a spray gun cooling air sleeve; 5. flue wear-resistant materials and heat-insulating materials; 6. a compressed air interventional device; 7. a gas injection head; 8. a denitration spray gun rod; 9. denitration spray gun nozzle.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, a compressed air intervention device for improving SNCR denitration efficiency includes an air pipe 6, an inlet end of the air pipe 6 is connected with an air source output end, an outlet end of the air pipe 6 is provided with an air jet head 7, the air pipe 6 passes through a flue wall 5, an end surface of the air jet head 7 is flush with the surface of the flue wall 5, the air pipe 6 and a center line of a denitration spray gun body are at the same horizontal height, the denitration spray gun body and the air pipe 6 are common equipment for a traditional SNCR denitration process, the utility model discloses do not make a specific restrictive introduction;
the compressed air intervention device is mainly used for blowing off the adherent ash flow of the horizontal flue, preventing a large amount of fly ash from adhering to a reducing agent and reducing the denitration efficiency;
in order to ensure the blowing effect of the fly ash, the pressure of the air source of the compressed air intervention device is higher than 0.15Mpa, and the air consumption rate of a single device is 0.5m3Min; the compressed air intervenes the device air supply and can select for use denitration device atomizing air, and then reduces device installation cost, because the device does not have nozzle throttling arrangement, the low-quality industrial gas of power plant also can be selected for use to the air supply.
The outlets of the gas injection heads are uniformly distributed gas injection holes, the aperture of each gas injection hole is 5-10 mm, and impurities in industrial gas can pass through the gas injection holes; the cross section of the gas injection head can be circular or rectangular or hexagonal, and the specific area is 2-3 times of the cross section of the air pipe 6;
the gas injection head needs to adopt high-temperature resistant stainless steel metal such as ZG40Cr25Ni20Mo to prevent the pores from being blocked and burnt and deformed; optionally, the gas injector head can also adopt resistant firebrick, and even trompil forms the gas injector head on resistant firebrick, prevents that the gas injector head from seting up inhomogeneously, utilizes wear-resisting plastic to fill the gas pocket partition wall, ensures that the gas pocket surface does not with high temperature flue gas direct contact.
As shown in fig. 1, in an SNCR denitration system equipped with the compressed air intervention device of the present invention, a compressed air intervention device is added in an upstream region where flue gas of an SNCR denitration spray gun flows; the denitration spray gun comprises a spray gun body, a cooling air sleeve 3 and an air pipe 6, wherein the spray gun body comprises a denitration spray gun nozzle 9 and a denitration spray gun rod 8, and the spray gun body is embedded in the cooling air sleeve 4; one end of the spray gun solution pipe is provided with a denitration reducing agent solution pipe joint 1, and the other end is connected with a denitration spray gun nozzle 9; a spray gun atomization air pipe is arranged outside the spray gun solution pipe, one end of the atomization air pipe is provided with an atomization air pipe joint 2, and the other end of the atomization air pipe is connected with a spray gun nozzle 9; the cooling air of the spray gun is connected into a cooling air sleeve 4 through a cooling air joint 3; the front end of the air pipe 6 is provided with a gas spraying head 7.
The utility model also provides an SNCR denitration system, which takes the flow direction of flue gas in the flue as reference, and the upstream of the denitration spray gun body is provided with the compressed air intervention device; the distance between the compressed air intervention device and the denitration spray gun body is 100-150 mm; the compressed air intervention device corresponds to the denitration spray gun one by one.
Claims (10)
1. The utility model provides a compressed air intervenes device for promoting SNCR denitration efficiency, a serial communication port, including tuber pipe (6), the air supply output is connected to the entry end of tuber pipe (6), and the exit end of tuber pipe (6) sets up gas jet head (7), and flue wall (5) are passed in tuber pipe (6), and the terminal surface and flue wall (5) surface parallel and level of gas jet head (7), the central line of tuber pipe (6) and the central line of denitration spray gun body are located same level.
2. The compressed air introduction device for improving SNCR denitration efficiency as claimed in claim 1, wherein a pressure at an output end of said air source is higher than 0.15 MPa.
3. The compressed air interventional device for improving SNCR denitration efficiency of claim 1, wherein the air source adopts denitration device atomized air or power plant low-quality industrial air.
4. The compressed air intervention device for improving SNCR denitration efficiency of claim 1, wherein the outlets of the gas injection heads are uniformly distributed gas injection holes, and the diameter of each gas injection hole is 5-10 mm.
5. A compressed air introduction device for improving SNCR denitration efficiency as set forth in claim 1, wherein a cross-sectional shape of the gas injection head is circular, rectangular or hexagonal.
6. The compressed air intervention device for improving SNCR denitration efficiency of claim 1, wherein a cross-sectional area of the gas injection head is 2-3 times a cross-sectional area of the air pipe (6).
7. The compressed air introduction device for improving the SNCR denitration efficiency as claimed in claim 1, wherein the space between adjacent gas injection holes of the gas injection head is filled with a wear-resistant plastic.
8. An SNCR denitration system, characterized in that, with reference to the flow direction of flue gas in a flue, the compressed air intervention device of claim 1 is arranged upstream of a denitration spray gun body.
9. The SNCR denitration system of claim 8, wherein the compressed air introduction device is 100-150 mm from the denitration lance body.
10. The SNCR denitration system of claim 8, wherein the compressed air introduction devices correspond one-to-one to the denitration lances.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022994861.XU CN214345531U (en) | 2020-12-14 | 2020-12-14 | Compressed air intervention device for improving SNCR (Selective non catalytic reduction) denitration efficiency and SNCR denitration system |
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| CN202022994861.XU CN214345531U (en) | 2020-12-14 | 2020-12-14 | Compressed air intervention device for improving SNCR (Selective non catalytic reduction) denitration efficiency and SNCR denitration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113959749A (en) * | 2021-10-26 | 2022-01-21 | 西安热工研究院有限公司 | Experimental device and method for testing characteristics of urea direct injection pyrolysis spray gun |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113959749A (en) * | 2021-10-26 | 2022-01-21 | 西安热工研究院有限公司 | Experimental device and method for testing characteristics of urea direct injection pyrolysis spray gun |
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