CN218688006U - Device for uniformly distributing nitric oxide pollutants in flue gas of W-shaped flame furnace - Google Patents
Device for uniformly distributing nitric oxide pollutants in flue gas of W-shaped flame furnace Download PDFInfo
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- CN218688006U CN218688006U CN202222635809.4U CN202222635809U CN218688006U CN 218688006 U CN218688006 U CN 218688006U CN 202222635809 U CN202222635809 U CN 202222635809U CN 218688006 U CN218688006 U CN 218688006U
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Abstract
The utility model relates to a device of nitrogen oxide pollutant equipartition in W type flame furnace flue gas. The utility model discloses a set up radian gradual change formula air current equipartition board at W type flame stove afterbody flue top, set up the side flue bottom the afterbody flue, set up the technical method of side flue draught fan and flue gas damper on the side flue. The utility model discloses a balanced equipartition of nitrogen oxide pollutant in the flue in W type flame furnace flue gas, the balanced equipartition of pollutant on the flue cross section is effectual. The utility model discloses the operation is maintained and is overhauld convenience, running resistance and running cost low, be applicable to the balanced equipartition of nitrogen oxide pollutant in the flue in W type flame stove flue gas.
Description
Technical Field
The utility model relates to a device of nitrogen oxide pollutant equipartition in W type flame stove flue gas especially relates to a device of nitrogen oxide pollutant equipartition in W type flame stove flue gas of compriseing radian gradual change type air current equipartition board, side flue draught fan and flue gas damper.
Background
As most of coal for W-shaped flame boiler combustion is anthracite and lean coal, extremely high hearth temperature, higher oxygen content and longer combustion flame are needed to fully burn off the coal powder, thus bringing about the problems of higher NOx emission value and 1000mg/Nm of NOx emission 3 The above. In order to meet the requirement of ultra-low emission of denitration provided in the working scheme of fully implementing ultra-low emission and energy-saving reconstruction of coal-fired power plants, namely the concentration of NOx is not more than 50 mg/m 3 (6%O 2 On the basis), the coal-fired power plant mainly adopts the nitrogen oxide purification measures of further exploiting the low-nitrogen combustion transformation potential to reduce the initial emission level of NOx at the outlet of a hearth and implementing Selective Catalytic Reduction (SCR) denitration and the like.
However, the W-type flame furnace has complicated fuel characteristics, variable combustion conditions and poor combustion atmosphere structure of the furnace chamber, so that a large amount of nitrogen oxides are formed and discharged into the flue gas, and what is more troublesome is that the concentration distribution of the nitrogen oxides in the flue gas is extremely uneven, which brings great difficulty to the design and operation of the subsequent Selective Catalytic Reduction (SCR) denitration purification facility, and how to effectively reduce the nonuniformity of the distribution of the NOx as much as possible is a difficult point of the design of the denitration flow field and the operation of the denitration facility.
The utility model discloses a nitrogen oxide pollutant equipartition technology in the W type flame furnace flue gas of innovation, on the one hand through strengthening in the W type flame furnace export flue gas nitrogen oxide's turbulence scale, strengthens nitrogen oxide's mixing uniformity, and on the other hand, through the design of side flue, the efficiency and the actual operation effect of further improving in the flue gas nitrogen oxide equipartition provide the even pollutant flow field condition of nitrogen oxide distribution for subsequent Selective Catalytic Reduction (SCR) flue gas denitration clarification plant. The invention designs a device for uniformly distributing nitric oxide pollutants in flue gas of a W-shaped flame furnace by adopting a synergistic innovative technology of principles such as an air flow turbulence uniform distribution technology, a side flue gas tangential mixing turbulence strengthening technology and the like, and obtains an expected effect through practical verification of engineering.
Disclosure of Invention
The utility model aims at providing a device of nitrogen oxide pollutant equipartition in W type flame stove flue gas, the adoption sets up radian gradual change formula air current equipartition board at W type flame stove afterbody flue top, sets up the side flue bottom the afterbody flue, sets up the method of nitrogen oxide pollutant equipartition in the W type flame stove flue gas of side flue draught fan and flue gas damper on the side flue. The utility model discloses a nitrogen oxide pollutant equipartition technology in the W type flame furnace flue gas of innovation, on the one hand through strengthening in the W type flame furnace export flue gas nitrogen oxide's turbulence scale, strengthens nitrogen oxide's mixing uniformity, and on the other hand, through the design of side flue, the efficiency and the actual operation effect of further improving in the flue gas nitrogen oxide equipartition provide the even pollutant flow field condition of nitrogen oxide distribution for subsequent Selective Catalytic Reduction (SCR) flue gas denitration clarification plant. The invention designs a method for uniformly distributing nitric oxide pollutants in flue gas of a W-shaped flame furnace by adopting a synergistic innovative technology of principles such as an air flow turbulence uniform distribution technology, a side flue gas tangential mixing turbulence strengthening technology and the like, and obtains an expected effect through practical verification of engineering. The invention has convenient operation maintenance and overhaul, low operation resistance and operation cost, and is suitable for the uniform distribution of nitrogen oxide pollutants in the flue gas of the W-shaped flame furnace in the flue so as to be beneficial to the removal and purification and ultra-clean emission of subsequent flue gas denitration and purification equipment.
In order to achieve the purpose, the utility model discloses set up radian gradual change formula air current equipartition board at W type flame stove afterbody flue top, radian gradual change formula air current equipartition board adoptsFour continuous arc-shaped air flow uniform distribution plates with different radians, wherein the included angles of tangent lines at two sides of the four arc-shaped air flow uniform distribution plates are respectively 110 ° ，130 ° 、150 ° 、170 ° And the tangent included angle of two sides of the circular arc-shaped air flow uniform distribution plate is designed in a special innovation mode that the included angle is gradually increased from the near end of the boiler to the far end of the boiler at the top of the tail flue. The radian-graded air distribution plate enhances the turbulence of nitrogen oxides in flue gas from the outlet of the W-shaped flame furnace, so that the nitrogen oxides are gradually and uniformly mixed in the flue, and the aim of uniformly and uniformly distributing the concentration of the nitrogen oxides on the cross section of the flue is fulfilled.
In order to achieve the above object, the utility model discloses set up the side flue bottom the afterbody flue, the import setting of side flue is at the boiler distal end of afterbody flue, and the export setting is at the boiler near-end of afterbody flue.
In order to achieve the purpose, the utility model discloses set up side flue draught fan and flue gas damper on the side flue, under the effect of side flue draught fan, the flue gas is drawn forth the back at side flue boiler distal end, through side flue boiler near-end reentrant afterbody flue. The flue gas outlet end of the side flue and the tail flue are 45 degrees ° And (4) an included angle. The flue gas baffle door is arranged at the inlet end of the side flue and used for controlling the flow of flue gas entering the side flue. According to the balanced and uniform distribution of nitrogen oxides on the cross section of flue gas at the inlet of the flue gas denitration and purification equipment, the flow of the flue gas entering the side flue is controlled to be 5% -8% of the total flue gas volume of the tail flue. The worse the balanced and uniform distribution condition of the nitrogen oxides is, the larger the opening degree of a flue gas baffle door is, and the larger the flue gas volume entering a side flue is. Flue gas of the side flue is 45 0 The contained angle gets into the afterbody flue, adopts tangent line mixing turbulence to strengthen the design, further improves nitrogen oxide's equipartition efficiency and actual operation effect in the flue gas.
Compared with the prior art, the utility model has the characteristics of it is following:
(1) By adopting the principles of air flow turbulence uniform distribution technology, side flue gas tangent mixed turbulence strengthening technology and the like, the invention realizes the uniform distribution of nitrogen oxide pollutants in the flue of the W-shaped flame furnace flue gas in the flue, and the uniform distribution effect of the pollutants on the cross section of the flue is good.
(3) The invention has convenient operation maintenance and overhaul, low operation resistance and operation cost, and is suitable for the uniform distribution of nitrogen oxide pollutants in the flue gas of the W-shaped flame furnace in the flue.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic view of the process flow of the present invention.
Fig. 2 is a schematic cross-sectional view of the arc gradual change type air distribution plate of the present invention.
In the figure: 1. the device comprises a W-shaped flame furnace, a 2-tail flue, a 3-radian gradual change type airflow uniform distribution plate, 4-flue gas denitration and purification equipment, 5-side flue, 6-side flue induced draft fan and 7-flue gas baffle door.
Detailed Description
In the figure 1, a radian-gradual-change type air flow uniform distribution plate is arranged at the top of a tail flue of a W-shaped flame furnace, a side flue is arranged at the bottom of the tail flue, and a side flue induced draft fan and a flue gas baffle door are arranged on the side flue.
In fig. 2, the radian-graded air distribution plate adopts four continuous arc-shaped air distribution plates with different radians, and the included angles of the tangents on the two sides of the four arc-shaped air distribution plates are respectively 110 ° ，130 ° 、150 ° 、170 ° And the tangent included angle of two sides of the circular arc-shaped air flow uniform distribution plate is designed in a special innovation mode that the included angle is gradually increased from the near end of the boiler to the far end of the boiler at the top of the tail flue.
When the utility model discloses a device of nitrogen oxide pollutant equipartition is in operating condition in W type flame stove flue gas, the radian gradual change formula air current equipartition board that sets up at afterbody flue top has strengthened the turbulence degree of nitrogen oxide in the flue in coming from W type flame stove export flue gas, makes nitrogen oxide misce bene gradually in the flue, reaches the purpose of the balanced equipartition of nitrogen oxide concentration on the flue cross section.
Under the action of a side flue induced draft fan, a certain proportion of flue gas from a tail flue is led out at the far end of a side flue boiler and then passes through side flueThe near end of the flue boiler enters the tail flue again. The flue gas outlet end of the side flue and the tail flue are 45 degrees ° And (4) an included angle. The flue gas baffle door is arranged at the inlet end of the side flue and used for controlling the flow of flue gas entering the side flue. According to the balanced and uniform distribution of nitrogen oxides on the cross section of flue gas at the inlet of the flue gas denitration and purification equipment, the flow of the flue gas entering the side flue is controlled to be 5% -8% of the total flue gas volume of the tail flue. The worse the balanced and uniform distribution condition of the nitrogen oxides, the larger the opening degree of the flue gas baffle door is, and the larger the flue gas quantity entering the side flue is. Flue gas of the side flue is 45 0 The contained angle gets into the afterbody flue, adopts tangent line mixing turbulence to strengthen the design, further improves nitrogen oxide's equipartition efficiency and actual operation effect in the flue gas.
By adopting the principles of an air flow turbulence uniform distribution technology, a side flue gas tangent mixing turbulence strengthening technology and the like, the invention realizes the uniform distribution of nitrogen oxide pollutants in the flue gas of the W-shaped flame furnace in the flue, and the uniform distribution effect of the pollutants on the cross section of the flue is good.
And nitrogen oxides in the flue gas enter the flue gas denitration and purification equipment after being uniformly distributed.
The utility model discloses the operation is maintained and is overhauld convenience, running resistance and running cost low, be applicable to the balanced equipartition of nitrogen oxide pollutant in the flue in W type flame stove flue gas.
The above embodiments are only examples, the technical features of the present invention are not limited thereto, and any person skilled in the art can make changes or modifications within the scope of the present invention.
Claims (5)
1. The utility model provides a device of nitrogen oxide pollutant equipartition in W type flame stove flue gas, mainly comprises radian gradual change formula air current equipartition board, side flue draught fan and flue gas damper, its characterized in that: the top of the tail flue of the W-shaped flame furnace is provided with an arc gradual change type air flow uniform distribution plate, the bottom of the tail flue is provided with a side flue, and the side flue is provided with a side flue induced draft fan and a flue gas baffle door.
2. The device of claim 1, wherein the device comprises: the radian-gradually-changed air flow uniform distribution plate adopts four continuous arc-shaped air flow uniform distribution plates with different radians, and the included angles of tangent lines at two sides of the four arc-shaped air flow uniform distribution plates are respectively 110 ° ，130 ° 、150 ° 、170 ° And the included angles of the tangent lines at the two sides of the circular arc-shaped airflow uniform distribution plate are gradually increased from the near end of the boiler to the far end of the boiler at the top of the tail flue.
3. The device of claim 1, wherein the device comprises: the inlet of the side flue is arranged at the far end of the boiler of the tail flue, and the outlet of the side flue is arranged at the near end of the boiler of the tail flue.
4. The device of claim 1, wherein the device comprises: the flue gas outlet end of the side flue and the tail flue are 45 degrees ° And (4) an included angle.
5. The device of claim 1, wherein the device comprises: the flue gas baffle door is arranged at the inlet end of the side flue and used for controlling the flow of flue gas entering the side flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222635809.4U CN218688006U (en) | 2022-10-09 | 2022-10-09 | Device for uniformly distributing nitric oxide pollutants in flue gas of W-shaped flame furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222635809.4U CN218688006U (en) | 2022-10-09 | 2022-10-09 | Device for uniformly distributing nitric oxide pollutants in flue gas of W-shaped flame furnace |
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| Publication Number | Publication Date |
|---|---|
| CN218688006U true CN218688006U (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222635809.4U Active CN218688006U (en) | 2022-10-09 | 2022-10-09 | Device for uniformly distributing nitric oxide pollutants in flue gas of W-shaped flame furnace |
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| CN (1) | CN218688006U (en) |
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- 2022-10-09 CN CN202222635809.4U patent/CN218688006U/en active Active
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