CN212132481U - Centrifugal fan export "ox horn type" cigarette wind channel structure - Google Patents
Centrifugal fan export "ox horn type" cigarette wind channel structure Download PDFInfo
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- CN212132481U CN212132481U CN202020616863.2U CN202020616863U CN212132481U CN 212132481 U CN212132481 U CN 212132481U CN 202020616863 U CN202020616863 U CN 202020616863U CN 212132481 U CN212132481 U CN 212132481U
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Abstract
The utility model relates to a centrifugal fan export "ox horn type" cigarette wind channel structure, including first reducing pipe and second reducing pipe etc. the entry of first reducing pipe is used for communicateing A side fan export, and the export of first reducing pipe communicates in proper order and has first reducing return bend, first pipe way, third pipe way, fifth pipe way and first constant diameter return bend, and the export of first constant diameter return bend communicates to the first entry of Y type confluence spare; the inlet of the second reducing pipe is used for being communicated and connected with the outlet of the B-side fan, the outlet of the second reducing pipe is sequentially communicated with a second reducing bent pipe, a second round pipeline, a fourth round pipeline, a sixth round pipeline and a second equal-diameter bent pipe, and the outlet of the second equal-diameter bent pipe is communicated with the second inlet of the Y-shaped confluence piece; the outlet of the Y-shaped confluence piece is communicated to the inlet of the circular converging flue. The utility model discloses implement respond well, can reduce the total pressure loss of draught fan export to desulfurization absorption tower import section flue by a wide margin, energy-conserving effect is showing, and then has improved the load carrying capacity of unit.
Description
Technical Field
The utility model relates to a flue gas duct that coal fired power plant flue gas system used, concretely relates to centrifugal fan export "ox horn type" flue gas duct structure.
Background
The structure of the flue gas duct at the outlet of the centrifugal fan in the flue gas and air system of the coal-fired power plant has important influence on the power consumption of the fan, the resistance characteristic of the flue gas and air system and the running performance of the fan. Generally, the sectional area of the outlet of the centrifugal fan is small, so that the flow velocity of the outlet of the fan is high (60-70 m/s), and the flow velocity in the flue of the coal-fired power plant is required to be within 15m/s, therefore, the outlet of the centrifugal fan is connected into the flue at the back through a reducer with large expansion degree, and the flow loss in the flue at the section is high; in addition, limited by problems such as site space arrangement, the condition that the flue gas duct at the outlet of the centrifugal fan is circuitous and turns and the airflow directly rushes against each other often occurs, and therefore the flow loss inside the flue gas duct is further increased remarkably.
Therefore, the duct resistance of the centrifugal fan outlet flue duct is generally at a high level, so that the power consumption of the fan increases significantly.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a centrifugal fan export "ox horn type" cigarette wind channel structure on the basis that does not change other equipment positions of centrifugal fan and cigarette wind channel, based on the bionics principle, sets up "ox horn type" cigarette wind channel in centrifugal fan export section cigarette wind channel to reduce the pipeline resistance in this section cigarette wind channel, thereby improve the economic nature of fan operation by a wide margin.
The utility model discloses a following technical scheme realizes:
a centrifugal fan outlet 'ox horn-shaped' flue duct structure comprises a first reducer pipe, a second reducer pipe, a Y-shaped confluence piece and a circular confluence flue; wherein the content of the first and second substances,
the inlet of the first reducing pipe is used for being communicated with the outlet of the side A fan, the outlet of the first reducing pipe is sequentially communicated with a first reducing bent pipe, a first round pipeline, a third round pipeline, a fifth round pipeline and a first equal-diameter bent pipe, and the outlet of the first equal-diameter bent pipe is communicated with the first inlet of the Y-shaped confluence piece;
the inlet of the second reducing pipe is used for being communicated and connected with the outlet of the B-side fan, the outlet of the second reducing pipe is sequentially communicated with a second reducing bent pipe, a second round pipeline, a fourth round pipeline, a sixth round pipeline and a second equal-diameter bent pipe, and the outlet of the second equal-diameter bent pipe is communicated with the second inlet of the Y-shaped confluence piece;
the outlet of the Y-shaped confluence piece is communicated to the inlet of the circular converging flue.
The utility model discloses further improvement lies in, is provided with the pneumatic check valve of first circular between first circular pipeline and the third circular pipeline, is provided with the pneumatic check valve of second circular between second circular pipeline and the fourth circular pipeline.
The utility model discloses further improvement lies in, is provided with first circular nonmetal compensator between third circular pipeline and the fifth circular pipeline, is provided with the circular nonmetal compensator of second between fourth circular pipeline and the sixth circular pipeline.
The utility model discloses further improvement lies in, first reducing pipe and first reducing return bend, second reducing pipe and second reducing return bend constitute two pipeline structures that have "ox horn type" characteristic for pass through gradually the rectangle pipeline of centrifugal fan export to conventional cross sectional dimension circle pipeline, and cross sectional variation coefficient gamma 2 ~ 6, and this pipeline changes simultaneously on level and two perpendicular directions, and the corner is beta 1 ═ 90 ~ 150 respectively, beta 2 ═ 90 ~ 150.
The utility model discloses further improvement lies in, and the expansion angle of first reducing pipe and second reducing pipe is 5 ~ 35, and reducing pipe export diameter is phi 1, and 1000m is less than or equal to phi 1 and is less than or equal to 5000 mm.
The utility model discloses further improvement lies in, and the diameter of six circular pipelines of first circular pipeline, second circular pipeline, third circular pipeline, fourth circular pipeline, fifth circular pipeline and sixth circular pipeline is the same, is phi 2, and has 2000mm to be less than or equal to phi 2 and is less than or equal to 6000 mm.
The utility model discloses further improvement lies in, and the contained angle beta 3 more than or equal to 40 less than or equal to 90 of Y type confluence piece.
The utility model discloses further improvement lies in, and circular diameter that converges the flue is phi 3, and 4000mm is no less than phi 3 and is no less than 10000 mm.
The utility model discloses at least, following profitable technological effect has:
adopt the utility model provides a pair of centrifugal fan export "ox horn type" cigarette wind channel structure implements respond well, can reduce the total pressure loss of draught fan export to desulfurization absorption tower import section flue by a wide margin, and energy-conserving effect is showing, and then has improved the load carrying capacity of unit.
Drawings
FIG. 1 is a perspective view of a "ox horn-shaped" smoke duct at the outlet of the centrifugal fan of the present invention;
FIG. 2 is a top view of the "ox horn" shaped flue duct at the outlet of the centrifugal fan of the present invention;
fig. 3 is a left side view of the centrifugal fan outlet 'ox horn-shaped' smoke duct of the utility model.
Description of reference numerals:
the device comprises a 1A-first reducing pipe, a 1B-second reducing pipe, a 2A-first reducing elbow, a 2B-second reducing elbow, a 3A-first round pipeline, a 3B-second round pipeline, a 4A-first round pneumatic check valve, a 4B-second round pneumatic check valve, a 5A-third round pipeline, a 5B-fourth round pipeline, a 6A-first round nonmetal compensator, a 6B-second round nonmetal compensator, a 7A-fifth round pipeline, a 7B-sixth round pipeline, a 8A-first reducing elbow, a 8B-second reducing elbow, a 9-Y-type confluence part and a 10-round confluence flue.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1 to 3, the utility model provides a centrifugal fan export "ox horn type" flue gas duct structure, including first reducing pipe 1A and second reducing pipe 1B, wherein, first reducing pipe 1A is used for connecting the export of a side fan and its back circular duct, and second reducing pipe 1B is used for connecting the export of B side fan and its back circular duct, is used for realizing the reducing of square pipeline to circular duct; the device comprises a first reducing elbow 2A and a second reducing elbow 2B, wherein the first reducing elbow 2A is arranged between a first reducing pipe 1A and a first round pipeline 3A, and the second reducing elbow 2B is arranged between a second reducing pipe 1B and a second round pipeline 3B, and is used for changing the diameter of the round pipeline from small to large and the airflow direction in the pipeline from inclined to horizontal; the circular pneumatic check valve is divided into a first circular pneumatic check valve 4A and a second circular pneumatic check valve 4B, wherein the first circular pneumatic check valve 4A is positioned between the first circular pipeline 3A and the third circular pipeline 5A, and the second circular pneumatic check valve 4B is positioned between the second circular pipeline 3B and the fourth circular pipeline 5B and is used for isolating smoke in the circular flue; the circular nonmetal compensator is divided into a first circular nonmetal compensator 6A and a second circular nonmetal compensator 6B, wherein the first circular nonmetal compensator 6A is positioned between the third circular pipeline 5A and the fifth circular pipeline 7A, and the second circular nonmetal compensator 6B is positioned between the fourth circular pipeline 5B and the sixth circular pipeline 7B and is used for absorbing the horizontal deformation of the circular flue; the first constant-diameter elbow 8A and the second constant-diameter elbow 8B are connected, wherein the first constant-diameter elbow 8A is connected with a fifth round pipeline 7A and a Y-shaped confluence part 9, the second constant-diameter elbow 8B is connected with a sixth round pipeline 7B and a Y-shaped confluence part 9, the first constant-diameter elbow 8A and the second constant-diameter elbow 8B are used for achieving low-loss steering of airflow inside the pipelines, and the Y-shaped confluence part 9 is used for achieving low-loss confluence of smoke in the pipelines on two sides; and the circular converging flue 10 is positioned behind the Y-shaped confluence piece 9 and is used for realizing the uniform flow of the air flow inside the pipeline behind the confluence piece 9.
Preferably, the first reducing pipe 1A, the first reducing elbow pipe 2A, the second reducing pipe 1B and the second reducing elbow pipe 2B form two pipeline structures with a "ox horn-shaped" characteristic, a small-section-size rectangular pipeline at the outlet of the centrifugal fan is gradually transited to a conventional-section-size circular pipeline (the flow speed is less than or equal to 15m/s), the section variation coefficient (outlet section/inlet section) γ is 2-6, the pipeline is simultaneously changed in the horizontal direction and the vertical direction, the rotation angles are respectively β 1-90 ° to 150 °, and β 2-90 ° to 150 °.
The expansion angle of the first reducing pipe 1A and the second reducing pipe 1B is 5-35 degrees, the diameter of the outlet of the reducing pipe is phi 1, and phi 1 is more than or equal to 1000m and less than or equal to 5000 mm.
The diameters of the first round pipeline 3A, the second round pipeline 3B, the third round pipeline 5A, the fourth round pipeline 5B, the fifth round pipeline 7A and the sixth round pipeline 7B are all the same, and are phi 2, and phi 2 is more than or equal to 2000mm and less than or equal to 6000 mm.
The included angle beta 3 of the Y-shaped confluence piece 9 is more than or equal to 40 degrees and less than or equal to 90 degrees.
The diameter of the circular converging flue 10 is phi 3, and phi 3 is more than or equal to 4000mm and less than or equal to 10000 mm.
Examples
A certain 350MW unit wind smoke system in China is provided with two double-suction centrifugal induced draft fans, a desulfurization system adopts a seawater desulfurization process, 100% of flue gas is treated in one furnace and one tower, and the flue gas is discharged into a chimney after being treated by the desulfurization system from the induced draft fans. However, through on-site actual measurement, under the working condition of 320MW, the average resistance of the flues from the outlet of the original flue induced draft fan to the two sides of the inlet section of the desulfurization absorption tower reaches 1800Pa, the power consumption of the fan is high due to the large flue resistance, and the problem that the full load of the unit cannot be carried out due to the insufficient output of the induced draft fan occurs in the unit. Through analysis and diagnosis, the flow loss of the section of flue is mainly concentrated at the position of a straight flue which is converged from the outlet of the induced draft fan to the outlet of the horizontal flue, and the resistance of the section is up to 1550 Pa.
Aiming at the problem that the flue resistance from the outlet of the induced draft fan to the inlet section of the desulfurization absorption tower is too high, the limitations of a flue support and an arrangement space at the position of the desulfurization absorption tower are comprehensively considered, the improvement economy is considered, and the circular flue structure of the converging flue section from the outlet of the induced draft fan to the outlet of the horizontal flue is provided. The structure of fig. 1 to 3 is provided, in which the first and second reducing pipes at the fan outlet are reduced from a rectangular cross section of 2120mm × 1767mm to a circular flue cross section of 3200mm phi, the first and second reducing elbows ("horn elbows") are reduced from a circular cross section of 3200mm phi to a circular cross section of 4700mm phi, and the Y-type return flue merges two circular flues of 4700mm diameter phi to a circular flue of 6600mm phi.
Adopt the implementation effect behind the utility model: before the flue from the outlet of the induced draft fan to the inlet section of the desulfurization absorption tower is optimized, the total pressure loss of the inlet and outlet sections of the flue at the section is 1800 Pa; and implement to this section flue the utility model discloses afterwards, this section flue advances, the total pressure loss of export cross-section is 590Pa, and the total pressure loss of this section flue has reduced and has exceeded 1210 Pa. Therefore, the utility model discloses an implement respond well, reduced the total pressure loss of draught fan export to desulfurization absorption tower import section flue by a wide margin, energy-conserving effect is showing, and then has improved the load carrying capacity of unit.
Claims (8)
1. A centrifugal fan outlet 'ox horn-shaped' flue duct structure is characterized by comprising a first reducer pipe (1A), a second reducer pipe (1B), a Y-shaped confluence piece (9) and a circular confluence flue (10); wherein the content of the first and second substances,
the inlet of the first reducing pipe (1A) is used for being communicated with the outlet of the side A fan, the outlet of the first reducing pipe (1A) is sequentially communicated with a first reducing bent pipe (2A), a first round pipeline (3A), a third round pipeline (5A), a fifth round pipeline (7A) and a first equal-diameter bent pipe (8A), and the outlet of the first equal-diameter bent pipe (8A) is communicated to the first inlet of the Y-shaped confluence piece (9);
the inlet of the second reducer pipe (1B) is used for being communicated and connected with the outlet of the B-side fan, the outlet of the second reducer pipe (1B) is sequentially communicated with a second reducer elbow (2B), a second round pipeline (3B), a fourth round pipeline (5B), a sixth round pipeline (7B) and a second equal-diameter elbow (8B), and the outlet of the second equal-diameter elbow (8B) is communicated to the second inlet of the Y-shaped confluence piece (9);
the outlet of the Y-shaped confluence piece (9) is communicated to the inlet of the circular confluence flue (10).
2. The centrifugal fan outlet 'ox horn-shaped' flue duct structure as claimed in claim 1, wherein a first round pneumatic check valve (4A) is arranged between the first round pipeline (3A) and the third round pipeline (5A), and a second round pneumatic check valve (4B) is arranged between the second round pipeline (3B) and the fourth round pipeline (5B).
3. The centrifugal fan outlet 'ox horn type' flue duct structure as claimed in claim 1, wherein a first circular nonmetal compensator (6A) is arranged between the third circular duct (5A) and the fifth circular duct (7A), and a second circular nonmetal compensator (6B) is arranged between the fourth circular duct (5B) and the sixth circular duct (7B).
4. The centrifugal fan outlet 'ox horn-shaped' flue duct structure as claimed in claim 1, wherein the first reducing pipe (1A), the first reducing elbow pipe (2A), the second reducing pipe (1B) and the second reducing elbow pipe (2B) form two pipe structures with 'ox horn-shaped' characteristics, the pipe structures are used for gradually transferring a rectangular pipe of the centrifugal fan outlet to a circular pipe with a conventional section size, the section change coefficient γ is 2-6, the pipe structures are simultaneously changed in the horizontal direction and the vertical direction, the rotation angles are respectively β 1-90-150 °, and β 2 is 90-150 °.
5. The centrifugal fan outlet 'ox horn type' flue duct structure as claimed in claim 1, wherein the expansion angle of the first reducer pipe (1A) and the second reducer pipe (1B) is 5-35 degrees, the outlet diameter of the reducer pipe is phi 1, and phi 1 is more than or equal to 1000m and less than or equal to 5000 mm.
6. The ox horn-shaped smoke duct structure at the outlet of the centrifugal fan as claimed in claim 1, wherein six circular ducts of the first circular duct (3A), the second circular duct (3B), the third circular duct (5A), the fourth circular duct (5B), the fifth circular duct (7A) and the sixth circular duct (7B) have the same diameter, are all phi 2, and the phi 2 is more than or equal to 2000mm and less than or equal to 6000 mm.
7. The centrifugal fan outlet ox horn type smoke duct structure as claimed in claim 1, wherein the included angle β 3 of the Y-shaped confluence piece (9) is greater than or equal to 40 ° and smaller than or equal to 90 °.
8. The ox horn-shaped smoke duct structure at the outlet of the centrifugal fan as claimed in claim 1, wherein the diameter of the circular converging flue (10) is phi 3, and phi 3 is more than or equal to 4000mm and less than or equal to 10000 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020616863.2U CN212132481U (en) | 2020-04-22 | 2020-04-22 | Centrifugal fan export "ox horn type" cigarette wind channel structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020616863.2U CN212132481U (en) | 2020-04-22 | 2020-04-22 | Centrifugal fan export "ox horn type" cigarette wind channel structure |
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| CN212132481U true CN212132481U (en) | 2020-12-11 |
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| CN202020616863.2U Active CN212132481U (en) | 2020-04-22 | 2020-04-22 | Centrifugal fan export "ox horn type" cigarette wind channel structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654068A (en) * | 2021-09-13 | 2021-11-16 | 上海市特种设备监督检验技术研究院 | Coal fired boiler desulfurization system inlet flue |
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2020
- 2020-04-22 CN CN202020616863.2U patent/CN212132481U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113654068A (en) * | 2021-09-13 | 2021-11-16 | 上海市特种设备监督检验技术研究院 | Coal fired boiler desulfurization system inlet flue |
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