CN113432483B - Self-adaptive adjusting method for inclination angle of internal fan of indirect air cooling tower - Google Patents
Self-adaptive adjusting method for inclination angle of internal fan of indirect air cooling tower Download PDFInfo
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- CN113432483B CN113432483B CN202110564533.2A CN202110564533A CN113432483B CN 113432483 B CN113432483 B CN 113432483B CN 202110564533 A CN202110564533 A CN 202110564533A CN 113432483 B CN113432483 B CN 113432483B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/10—Component parts of trickle coolers for feeding gas or vapour
- F28F25/12—Ducts; Guide vanes, e.g. for carrying currents to distinct zones
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
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Abstract
The invention discloses a self-adaptive adjusting method for an inclination angle of a fan in an indirect air cooling tower, which relates to the technical field of indirect air cooling systems of power stations and solves the technical problems that an included angle between air flow at an outlet of the fan and air flow in the tower is large and the thermal performance of the indirect air cooling system is not strong. Therefore, the included angle between the outlet airflow of the fan in the tower and the airflow in the tower is reduced, the momentum loss generated by impact is weakened, the pressurizing effect of the fan is strengthened, and the thermal performance of the indirect air cooling tower is finally improved.
Description
Technical Field
The disclosure relates to the technical field of indirect air cooling systems of power stations, in particular to a self-adaptive adjusting method for an inclination angle of an internal fan of an indirect air cooling tower.
Background
In recent years, indirect air cooling systems have been developed rapidly due to high water-saving performance, however, because the cooling medium is air, the heat exchange coefficient is low, the thermal performance is closely related to the external environment, the heat exchange temperature difference is reduced when the ambient temperature is increased, the heat exchange effect is seriously affected, and when the ambient wind speed is too high, the ambient wind can also reduce the cooling effect of the air cooling tower.
In order to weaken the adverse effect of high temperature and environmental wind on an indirect air cooling system and improve the thermal performance of the indirect air cooling system, the currently mainly adopted method comprises the steps of arranging a filler, spraying precooling, a guide plate, mechanical ventilation and the like. The mechanical ventilation is realized by arranging the fan in the air cooling tower, so that the ventilation volume in the tower can be increased, the heat transfer effect is enhanced, and the negative influence of high temperature and strong wind on heat exchange of the radiator is better overcome. However, the flow of the air flow in the air cooling tower is complex, and after the mechanical ventilation device is arranged in the tower, an included angle exists between the air flow at the outlet of the fan and the air flow in the tower, so that the two air flows impact each other to generate momentum loss, and the pressurization effect of the mechanical ventilation is weakened.
How to carry out self-adaptive adjustment on the inclination angle of a fan in an indirect air cooling system coupled with mechanical ventilation is a problem to be solved urgently.
Disclosure of Invention
The invention provides a self-adaptive adjusting method for an inclination angle of a fan in an indirect air cooling tower, which aims to reduce an included angle between air flow at an outlet of the fan and air flow in the tower and enhance the thermal performance of an indirect air cooling system.
The technical purpose of the present disclosure is achieved by the following technical solutions:
a self-adaptive adjustment method for an inclination angle of a fan in an indirect air cooling tower, wherein the fan is arranged on a plane in the indirect air cooling tower, the distance between the plane and the bottom of the indirect air cooling tower is 10% -20% of the height of the indirect air cooling tower, the horizontal distance between the central point of the fan and the vertical axis of the indirect air cooling tower is 25% -35% of the diameter of the outer edge of a radiator, and the method comprises the following steps:
step S1: collecting the main air velocity and the main air direction in the area of the indirect air cooling tower;
step S2: dividing the running states of the fan according to the main wind speed, wherein the running states comprise a low wind speed running state, a medium wind speed running state and a high wind speed running state; partitioning the fans according to the main wind direction, wherein the fans comprise a windward fan, a crosswind fan and a leeward fan;
step S3: inquiring the corresponding inclination angles of the fans in different running states and different subareas according to the running states and the subareas of the fans;
step S4: and adjusting the angle of each fan according to the inclination angle.
The beneficial effect of this disclosure lies in: according to the self-adaptive adjusting method for the inclination angle of the fan in the indirect air cooling tower, the operation state of the fan and the partition of the fan are divided through the main air guiding speed and the main air guiding direction in the area of the indirect air cooling tower, the inclination angle corresponding to the fan in different operation states and different partitions is inquired according to the operation state of the fan and the partition of the fan, and finally the angle of each fan is adjusted according to the inclination angle. Therefore, the included angle between the outlet airflow of the fan in the tower and the airflow in the tower is reduced, the momentum loss generated by impact is weakened, the pressurizing effect of the fan is strengthened, and the thermal performance of the indirect air cooling tower is finally improved.
Drawings
FIG. 1 is a flow chart of a method described herein;
FIG. 2 is a schematic view of a section of the present application;
FIG. 3 is a schematic view of a half tower configuration according to an embodiment of the present application;
FIG. 4 is a top view of a half tower structure according to an embodiment of the present application.
In the figure: 1-a tower wall; 2-a radiator; 3, a fan; 4-horizontal line l from central point of fan to vertical axis of indirect air cooling towern(ii) a 5-fan rotational symmetry axis.
Detailed Description
The technical scheme of the disclosure will be described in detail with reference to the accompanying drawings. In the description of the present application, it is to be understood that the terms "horizontal", "vertical", "center", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application. The term "inside" and "outside" refer to the inside and the outside of the contour of each member itself.
Fig. 1 is a flow chart of the method of the present application, in the method, a fan is arranged on a plane in an indirect air cooling tower, the distance between the plane and the tower bottom of the indirect air cooling tower is 10% -20% of the height of the indirect air cooling tower, the horizontal distance between the central point of the fan and the vertical axis of the indirect air cooling tower is 25% -35% of the diameter of the outer edge of a radiator, and the radiator is arranged in the indirect air cooling tower.
As shown in fig. 1, the method includes: step S1: and collecting the main air velocity and the main air direction in the area of the indirect air cooling tower.
Step S2: dividing the running states of the fan according to the main wind speed, wherein the running states comprise a low wind speed running state, a medium wind speed running state and a high wind speed running state; and partitioning the fan according to the main wind direction, wherein the fan comprises a windward fan, a crosswind fan and a leeward fan, and the partition diagram of the application is shown in figure 2.
Specifically, the low wind speed is VL, and VL is less than or equal to V1; the medium wind speed is VM which is more than V1 and less than or equal to V2; the high wind speed is VH, and VH is more than V2. V1 is the critical wind speed of low wind speed and medium wind speed, V2 is the critical wind speed of medium wind speed and high wind speed, V1, V2 are related to indirect air cooling tower structure, size and the climate of the area where the indirect air cooling tower is located, and can be defined according to actual conditions.
Carrying out partition on the fan according to the main wind direction, comprising: determining different zones of the fan according to an angle theta, theta being lhAngle with the main wind direction, lhIs a horizontal line between any azimuth point in the tower and the central axis of the tower. Based on 0 degree in the positive windward direction and 180 degrees in the positive leeward direction, the angle of the fan in the windward area is between 60 degrees below zero and 60 degrees below zero, the angle of the fan in the crosswind area is between 60 degrees below zero and 120 degrees below zero or between 120 degrees below zero and 60 degrees below zero, and the angle of the fan in the leeward area is between 120 degrees below zero and 180 degrees below zero or between 180 degrees below zero and 120 degrees.
Step S3: and inquiring the corresponding inclination angles of the fans in different running states and different partitions according to the running states and the partitions of the fans.
In the low wind speed operation state, the inclination angle
The method comprises the following steps: (1) the included angle between the plane of the fan in the windward area and the horizontal plane where the central point of the fan is
(2) The included angle between the plane of the fan in the side wind area and the horizontal plane where the central point of the fan is positioned is
(3) The included angle between the plane of the fan in the leeward area and the horizontal plane where the central point of the fan is
In the middle speed running state, the inclination angle
The method comprises the following steps: (1) the included angle between the plane of the fan in the windward area and the horizontal plane where the central point of the fan is
Theta is more than or equal to 60 degrees and less than or equal to 60 degrees; (2) the included angle between the plane of the fan in the side wind area and the horizontal plane where the central point of the fan is positioned is
(3) The included angle between the plane of the fan in the leeward area and the horizontal plane where the central point of the fan is
Theta is more than 120 degrees and less than or equal to 180 degrees or more than or equal to-180 degrees and less than-120 degrees. Wherein the content of the first and second substances,
theta is 0 DEG to obtain
And is
Theta is +/-60 DEG to obtain
And is
Theta is + -180 DEG to obtain
And is
Theta is +/-120 DEG to obtain
And is
In the high wind speed operation state, the inclination angle
The method comprises the following steps: (1) the included angle between the plane of the fan in the windward area and the horizontal plane where the central point of the fan is
Theta is more than or equal to 60 degrees and less than or equal to 60 degrees; (2) the included angle between the plane of the fan in the side wind area and the horizontal plane where the central point of the fan is positioned is
Theta is more than 60 degrees and less than or equal to 120 degrees or more than or equal to-120 degrees and less than-60 degrees; (3) the included angle between the plane of the fan in the leeward area and the horizontal plane where the central point of the fan is
Theta is more than 120 degrees and less than or equal to 180 degrees or more than or equal to-180 degrees and less than-120 degrees. Wherein the content of the first and second substances,
theta is 0 DEG to obtain
And is
Theta is +/-60 DEG to obtain
And is
∈[17°,20°]；
Theta is +/-60 DEG or +/-120 DEG to obtain
And is
Theta is obtained at + -90 DEG
And is
Theta is + -180 DEG to obtain
And is
Theta is +/-120 DEG to obtain
And is
Step S4: and adjusting the angle of each fan according to the inclination angle. Specifically, the central point of the fan is used as the rotation center, and the fan passes through the central point of the fan and is connected with the fannThe vertical line is a rotating shaft and inclines towards the inside of the tower
Wherein the content of the first and second substances,
is the plane of the fan and the fanAngle of horizontal plane in which the center point is located,/nAnd a horizontal line from the central point of the fan to the vertical axis of the indirect air cooling tower is shown, and n represents the number of the fan.
When the plane of the fan is vertical to the direction of the air flow in the tower, the included angle between the air flow at the outlet of the fan and the air flow in the tower is minimum, and the loss of kinetic energy is minimum. If the inclination angle of the fan to be adjusted is to be calculated, the average included angle between the air flow of any area to be arranged with the fan and the horizontal plane where the central point of the fan is located in the tower when the fan is not arranged at different wind speeds is calculated through numerical simulation.
For example, if it is considered that the average included angle between the air flow of the fan region in the tower and the horizontal plane where the central point of the fan is located when the fan is not arranged in the windward region (i.e. when the fan in the windward region is arranged, the horizontal plane of the fan and the horizontal plane where the central point of the fan is located when the air flow direction in the tower is perpendicular) is α 1, the inclination angle of the fan in the windward region is set in the low-wind-speed operation state
Similarly, if the average included angle between the air flow of the fan region in the tower and the horizontal plane where the central point of the fan is located when the fan is not arranged in the crosswind region (i.e. when the fan in the crosswind region is arranged, the horizontal plane of the fan and the horizontal plane where the central point of the fan is located when the air flow direction in the tower is perpendicular) is α 2, the inclination angle of the fan in the crosswind region is set when the tower is in the low-wind-speed operation state
Similarly, if the average included angle between the air flow of the fan region in the tower and the horizontal plane where the central point of the fan is located when the fan is not arranged in the lee region (i.e. when the fan in the lee region is arranged, the horizontal plane where the central point of the fan is located when the horizontal plane of the fan is perpendicular to the air flow direction in the tower) is α 3, the inclination angle of the fan in the lee region is set to be α 3 when the tower is in a low-wind-speed operation state
And in the middle wind speed running state, the maximum inclination angle and the minimum inclination angle of the fan in the windward area
Inclination angle of fan in side wind area
Maximum and minimum inclination angles of fan in leeward area
Similarly, under the high-wind-speed operation state, the maximum inclination angle and the minimum inclination angle of the fan in the windward area
Maximum and minimum inclination angles of side wind area fan
Maximum and minimum inclination angles of fan in leeward area
Fig. 3 and 4 are schematic diagrams of a half-tower structure according to an embodiment of the present application, in which a tower height is 173m, a tower outlet diameter is 91m, a radiator outer edge diameter is 155m, and an altitude of a region is 1371.4m, fans are arranged at a position 28m away from a tower bottom plane (generally about 10-20% of the tower height), a horizontal distance between a fan center point and an air cooling tower axis is 48m (generally about 25-35% of the radiator outer edge diameter), 40 fans are arranged in a whole tower, a monthly average wind speed in summer (6-9 months) is 3.3m/s, 2.5m/s, 2.3m/s, 2.6m/s, and a maximum wind speed is 6.6m/s in sequence.
V1 is the critical wind speed of low wind speed and medium wind speed; v2 is the critical wind speed of medium wind speed and high wind speed. V1 and V2 are related to the structure, the size and the climate of the area where the indirect air cooling tower is located, and by combining the practical situation of the embodiment, V1 is determined to be 2m/s, V2 is determined to be 6m/s, the low wind speed VL is less than or equal to 2m/s, the medium wind speed 2m/s is less than VM and less than or equal to 6m/s, and the high wind speed VH is more than 6 m/s.
According to the method of the present application, coefficients in the functional relation followed by the adjustment angles and the adjustment inclination angles of the fans located in different zones under different operating states are obtained by simulation calculation, as shown in table 1, and finally the adjustment angles are output according to the specific operating states and zones of each fan.
TABLE 1
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (3)
1. A self-adaptive adjusting method for an inclination angle of a fan in an indirect air cooling tower is characterized in that the fan is arranged on a plane in the indirect air cooling tower, the distance between the plane and the bottom of the indirect air cooling tower is 10% -20% of the height of the indirect air cooling tower, the horizontal distance between the center point of the fan and the vertical axis of the indirect air cooling tower is 25% -35% of the diameter of the outer edge of a radiator, and the method comprises the following steps:
step S1: collecting the main air velocity and the main air direction in the area of the indirect air cooling tower;
step S2: dividing the running states of the fan according to the main wind speed, wherein the running states comprise a low wind speed running state, a medium wind speed running state and a high wind speed running state; partitioning the fans according to the main wind direction, wherein the fans comprise a windward fan, a crosswind fan and a leeward fan;
step S3: inquiring the corresponding inclination angles of the fans in different running states and different subareas according to the running states and the subareas of the fans;
step S4: adjusting the angle of each fan according to the inclination angle;
wherein, in the low wind speed operation state, the inclination angle
The method comprises the following steps:
the included angle between the plane of the fan in the windward area and the horizontal plane where the central point of the fan is
The included angle between the plane of the fan in the side wind area and the horizontal plane where the central point of the fan is positioned is
The included angle between the plane of the fan in the leeward area and the horizontal plane where the central point of the fan is
In the middle speed running state, the inclination angle
The method comprises the following steps:
the included angle between the plane of the fan in the windward area and the horizontal plane where the central point of the fan is
-60°≤θ≤60°；
The included angle between the plane of the fan in the side wind area and the horizontal plane where the central point of the fan is positioned is
The included angle between the plane of the fan in the leeward area and the horizontal plane where the central point of the fan is
Theta is more than 120 degrees and less than or equal to 180 degrees or more than or equal to-180 degrees and less than-120 degrees;
wherein the content of the first and second substances,
theta is 0 DEG to obtain
And is
Theta is +/-60 DEG to obtain
And is
In the high wind speed operation state, the inclination angle
The method comprises the following steps:
the included angle between the plane of the fan in the windward area and the horizontal plane where the central point of the fan is
-60°≤θ≤60°；
The included angle between the plane of the fan in the side wind area and the horizontal plane where the central point of the fan is positioned is
Theta is more than 60 degrees and less than or equal to 120 degrees or more than or equal to-120 degrees and less than-60 degrees;
the included angle between the plane of the fan in the leeward area and the horizontal plane where the central point of the fan is
Theta is more than 120 degrees and less than or equal to 180 degrees or more than or equal to-180 degrees and less than-120 degrees;
wherein the content of the first and second substances,
theta is 0 DEG to obtain
And is
Theta is +/-60 DEG to obtain
And is
2. The method according to claim 1, wherein in step S2, the partitioning the wind turbine according to the main wind direction includes:
determining different partitions of the fan according to the angle theta; wherein θ is lhAngle with the main wind direction, lhIs a horizontal line between any azimuth point in the tower and the central axis of the tower;
based on 0 degree in the positive windward direction and 180 degrees in the positive leeward direction, the angle of the fan in the windward area is between 60 degrees below zero and 60 degrees below zero, the angle of the fan in the crosswind area is between 60 degrees below zero and 120 degrees below zero or between 120 degrees below zero and 60 degrees below zero, and the angle of the fan in the leeward area is between 120 degrees below zero and 180 degrees below zero or between 180 degrees below zero and 120 degrees.
3. The method of claim 2, wherein the adjusting the angle of each fan according to the inclination angle in step S4 comprises:
using the central point of the fan as the rotation center, and using the fan plane, passing through the central point of the fan and InThe vertical line is a rotating shaft and inclines towards the inside of the tower
Wherein the content of the first and second substances,
is the included angle between the plane of the fan and the horizontal plane of the central point of the fannAnd a horizontal line from the central point of the fan to the vertical axis of the indirect air cooling tower is shown, and n represents the number of the fan.
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| CN111457779A (en) * | 2020-04-30 | 2020-07-28 | 济南蓝辰能源技术有限公司 | Indirect air cooling air guide system capable of changing radial direction into different angles |
| CN111595174A (en) * | 2020-07-10 | 2020-08-28 | 济南蓝辰能源技术有限公司 | Direct air cooling tower with split rotary air guide device |
| CN111594468A (en) * | 2020-05-13 | 2020-08-28 | 西安热工研究院有限公司 | Overall regulation control method for air cooling fan group of direct air cooling unit of power station |
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2021
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204787904U (en) * | 2015-04-30 | 2015-11-18 | 亿吉埃冷却系统有限公司 | Cooling tower |
| CN107451397A (en) * | 2017-07-06 | 2017-12-08 | 扬州大学 | Blower fan of cooling tower and regulative mode accurate quantification optimum choice method based on optimization operation |
| CN107956638A (en) * | 2017-11-15 | 2018-04-24 | 三重能有限公司 | Wind turbine group of planes control method, control system and wind field |
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