CN211424374U - Secondary air nozzle for preventing and treating high-temperature corrosion of water-cooled wall of four-corner tangential firing boiler - Google Patents
Secondary air nozzle for preventing and treating high-temperature corrosion of water-cooled wall of four-corner tangential firing boiler Download PDFInfo
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- CN211424374U CN211424374U CN201922410294.6U CN201922410294U CN211424374U CN 211424374 U CN211424374 U CN 211424374U CN 201922410294 U CN201922410294 U CN 201922410294U CN 211424374 U CN211424374 U CN 211424374U
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- secondary air
- air nozzle
- wall
- temperature corrosion
- firing boiler
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Abstract
The utility model discloses a overgrate air spout that is used for four corners tangential firing boiler water-cooling wall high temperature corrosion to prevent and treat, including setting up compound combustion-supporting overgrate air spout (3) and compound adherence overgrate air spout (4) in overgrate air wind channel (2) exit side by side, on two spout location back whole were fixed in the combustor panel, two spout tip all were provided with a plurality of guide plates (6), and all seted up expansion joint (5) on the inner wall of two spouts and on guide plate (6). The utility model relates to a rationally, simple structure can form the efflux that sweeps of the rotatory air current low reaches of flue gas of the burner district of the combustion boiler burner of four corners tangential firing boiler, fundamentally prevents and treats four corners tangential firing boiler water wall high temperature corrosion problem.
Description
Technical Field
The utility model belongs to the technical field of four corners tangential firing boiler water wall high temperature corrosion prevention and cure, especially, relate to a overgrate air spout that is used for four corners tangential firing boiler water wall high temperature corrosion prevention and cure.
Background
With the continuous improvement of the control requirement of nitrogen oxide discharged by domestic coal-fired boilers, most of the four-corner tangential coal-fired boilers adopt the low-nitrogen combustion technology of deep air classification to realize low NOxAnd (5) discharging. However, for a four-corner tangential firing boiler, under the low-nitrogen combustion condition of a main burner region, the oxygen content of the near wall of the water-cooled wall at the downstream half side of the flue gas swirling flow is very low, and the local reducing atmosphere is formed, and meanwhile, a large amount of corrosive gas (mainly H in the reducing atmosphere) exists in the region2S gas) to cause serious high-temperature corrosion of the water-cooled wall at the downstream half side of the smoke rotating airflow in the main burner area, so that the wall of the water-cooled wall is quickly corroded and thinned and even explodes, and the running safety of the boiler is seriously influenced.
At present, no mature and reliable prevention and control means for high-temperature corrosion of a semi-side water-cooled wall at the downstream of smoke rotating airflow in a main burner area of a four-corner tangential firing boiler still exist in China, most boilers which have high-temperature corrosion of the water-cooled wall can only be relieved by adopting a passive anticorrosive spraying method, and the method has the defects of short service life, increased long-term maintenance cost and the like. The secondary air nozzle for preventing and controlling the high-temperature corrosion of the water-cooled wall of the tangential firing boiler at four corners can fundamentally and effectively protect the water-cooled wall pipe in the area of the hearth easy to corrode at high temperature, can be realized only by replacing part of the secondary air nozzle, and has good safety and economy.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the not enough of above-mentioned prior art, a overgrate air spout that is used for four corners tangential firing boiler water wall high temperature corrosion to prevent and treat is provided.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
the utility model provides a overgrate air spout that is used for high temperature corrosion of four corners tangential firing boiler water-cooling wall to prevent and treat, is including setting up the compound combustion-supporting overgrate air spout and the compound adherence overgrate air spout in overgrate air wind channel exit side by side, and on two spouts location back whole were fixed in the combustor panel, two spout tip all were provided with a plurality of guide plates, and all seted up the dilatation joint on the inner wall of two spouts and on the guide plate.
The utility model discloses further improvement lies in, overgrate air wind channel entrance is provided with the overgrate air door.
The utility model discloses a further improvement lies in, and compound combustion-supporting overgrate air spout and compound adherence overgrate air spout regard as the wind regime with hot overgrate air, and spout wind speed is unanimous with main burner secondary wind speed.
The utility model discloses further improvement lies in, and compound combustion-supporting overgrate air spout and compound adherence overgrate air spout are whole all to adopt the rectangle spout, and the aspect ratio is unanimous with main burner overgrate air spout aspect ratio, and the level is arranged.
The utility model discloses further improvement lies in, and compound combustion-supporting overgrate air spout jet direction is the same with the flue gas owner rotation air current direction, and unanimous with main burner overgrate air spout jet direction.
The utility model discloses further improvement lies in, and compound adherence overgrate air spout efflux direction is on a parallel with and closes on side water-cooling wall horizontal center line and arranges, and efflux direction and flue gas owner rotation air current opposite direction.
The utility model discloses at least following profitable technological effect:
the utility model discloses a fall into two parts with original traditional combustion-supporting overgrate air spout, one part remains the combustion-supporting function of overgrate air, another part overgrate air sets to be on a parallel with water-cooling wall horizontal center line and with main flue gas whirl opposite direction's adherence overgrate air, form the efflux that sweeps that effectively covers the water-cooling wall perishable region, the nearly wall department of the half side water-cooling wall that makes the regional rotatory air current of main burner low reaches is the oxidizing atmosphere, reduce corrosive gas H2And the concentration of S is used for realizing the high-temperature corrosion prevention of the water-cooled wall in the region.
The utility model relates to a rationally, simple structure can form the efflux that sweeps of the rotatory air current low reaches of flue gas of the burner district of the combustion boiler burner of four corners tangential firing boiler, fundamentally prevents and treats four corners tangential firing boiler water wall high temperature corrosion problem.
Drawings
FIG. 1 is the utility model relates to a top view of overgrate air spout that is used for four corners tangential firing boiler water wall high temperature corrosion control.
Fig. 2 is a view from a direction a of the overfire air nozzle for preventing and treating high-temperature corrosion of the water wall of the tangential firing boiler.
Description of reference numerals:
1-secondary air door; 2-secondary air duct; 3-compound combustion-supporting secondary air nozzle; 4-composite wall-attached secondary air nozzle; 5-expansion gap; 6 a deflector.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figures 1 and 2, the utility model provides a pair of a overgrate air spout that is used for four corners tangential firing boiler water wall high temperature corrosion to prevent and treat has as follows:
(1) this overgrate air spout is including setting up compound combustion-supporting overgrate air spout 3 and compound adherence overgrate air spout 4 in overgrate air wind channel 2 exit side by side, and 2 entrances in overgrate air wind channel are provided with overgrate air door 1, and on two spouts location back whole were fixed in the combustor panel, two spout tip all were provided with a plurality of guide plates 6, and all seted up expansion joint 5 on the inner wall of two spouts and on the guide plate 6.
(2) The secondary air nozzle comprises a composite combustion-supporting secondary air nozzle 3 and a composite wall-attached secondary air nozzle 4, the composite combustion-supporting secondary air nozzle 3 takes hot secondary air as an air source, the air speed of the nozzle is consistent with the secondary air speed of the main burner, the jet flow direction is the same as the main rotating airflow direction of the flue gas and is consistent with the jet flow direction of the main burner secondary air nozzle, the composite wall-attached secondary air nozzle 4 takes the hot secondary air as the air source, the air speed of the nozzle is consistent with the secondary air speed of the main burner, and the jet flow direction is opposite to the main rotating airflow direction of the flue; the composite combustion-supporting secondary air nozzle 3 and the composite wall-attached secondary air nozzle 4 are rectangular nozzles, and the height-width ratio of the nozzles is consistent with that of the primary burner secondary air nozzle and is horizontally arranged.
(3) The secondary air nozzle is integrally cast and manufactured by adopting high-temperature-resistant steel.
Without departing from the scope of the present invention, various changes and modifications may be made by those skilled in the art, and all equivalent technical solutions should also fall within the scope of the present invention.
Claims (6)
1. The utility model provides a overgrate air spout that is used for high temperature corrosion of four corners tangential firing boiler water-cooling wall to prevent and treat which characterized in that, including compound combustion-supporting overgrate air spout (3) and compound adherence overgrate air spout (4) that set up in overgrate air wind channel (2) exit side by side, on two spouts location back whole were fixed in the combustor panel, two spout tip all were provided with a plurality of guide plates (6), and all seted up expansion joint (5) on the inner wall of two spouts and on guide plate (6).
2. The secondary air nozzle for preventing and treating high-temperature corrosion of the water wall of the tangential firing boiler in four corners as claimed in claim 1, characterized in that a secondary air damper (1) is arranged at the inlet of the secondary air duct (2).
3. The secondary air nozzle for preventing and treating high-temperature corrosion of the water wall of the quadrangular tangential firing boiler according to claim 1, wherein the composite combustion-supporting secondary air nozzle (3) and the composite wall-attached secondary air nozzle (4) use hot secondary air as an air source, and the air speed of the nozzles is consistent with the secondary air speed of a main burner.
4. The secondary air nozzle for preventing and treating high-temperature corrosion of the water wall of the tangential firing boiler in four corners as claimed in claim 1, characterized in that the composite combustion-supporting secondary air nozzle (3) and the composite wall-attached secondary air nozzle (4) are both rectangular nozzles as a whole, and the aspect ratio is consistent with that of the primary air nozzle of the main burner and is horizontally arranged.
5. The secondary air nozzle for preventing and treating high-temperature corrosion of the water wall of the tangential firing boiler in four corners as claimed in claim 1, characterized in that the jet direction of the composite combustion-supporting secondary air nozzle (3) is the same as the main rotating airflow direction of the flue gas and is the same as the jet direction of the primary air nozzle of the main burner.
6. The secondary air nozzle for preventing and treating high-temperature corrosion of the water-cooled wall of the quadrangular tangential firing boiler as claimed in claim 1, wherein the jet direction of the composite wall-attached secondary air nozzle (4) is arranged in parallel with the horizontal center line of the water-cooled wall adjacent to the side, and the jet direction is opposite to the main rotating gas flow direction of the flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922410294.6U CN211424374U (en) | 2019-12-28 | 2019-12-28 | Secondary air nozzle for preventing and treating high-temperature corrosion of water-cooled wall of four-corner tangential firing boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922410294.6U CN211424374U (en) | 2019-12-28 | 2019-12-28 | Secondary air nozzle for preventing and treating high-temperature corrosion of water-cooled wall of four-corner tangential firing boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211424374U true CN211424374U (en) | 2020-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922410294.6U Active CN211424374U (en) | 2019-12-28 | 2019-12-28 | Secondary air nozzle for preventing and treating high-temperature corrosion of water-cooled wall of four-corner tangential firing boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211424374U (en) |
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2019
- 2019-12-28 CN CN201922410294.6U patent/CN211424374U/en active Active
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