阅读说明：本技术 一种电站直接空冷机组空冷风机群统筹调节控制方法 (Overall regulation control method for air cooling fan group of direct air cooling unit of power station ) 是由 孙大伟 王星 郑金 陈得胜 闫宏 石清鑫 马翔 李凯伦 李昊燃 于 2020-05-13 设计创作，主要内容包括：本发明公开了一种电站直接空冷机组空冷风机群统筹调节控制方法,包括：根据空冷风机群周围风场强度的大小,将空冷风机群的运行状态划分为无风、低风、中风和高风4种运行状态；空冷风机群共有p行、q列,共计p·q台空冷风机,空冷风机群在每种运行状态,分别设定不同的转速调节控制方法,并在空冷风机群周围配置风场的风速、风向监测设备和调节控制设备,用于实现空冷风机群的统筹调节控制和不同运行状态之间的切换。本发明在不改变电站空冷风机群结构和布局的前提下,根据空冷风机群周围的风向和风速,对空冷风机群内部的空冷风机分区域进行转速调节,实现了空冷风机群平均运行风量达到单台空冷风机设计风量的目的。(The invention discloses a method for overall regulation and control of air cooling fan groups of a direct air cooling unit of a power station, which comprises the following steps: according to the intensity of the wind field around the air cooling fan group, dividing the running states of the air cooling fan group into 4 running states of no wind, low wind, middle wind and high wind; the air cooling fan group has p rows and q columns, and p.q air cooling fans are counted, different rotating speed adjusting control methods are set for each operating state of the air cooling fan group, and wind speed and wind direction monitoring equipment and adjusting control equipment of a wind field are arranged around the air cooling fan group, so that overall adjusting control of the air cooling fan group and switching between different operating states are realized. According to the invention, on the premise of not changing the structure and layout of the air cooling fan group of the power station, the rotating speed of the air cooling fans in the air cooling fan group is regulated in different areas according to the wind direction and the wind speed around the air cooling fan group, so that the aim of achieving the design wind rate of a single air cooling fan by the average running wind rate of the air cooling fan group is achieved.)

1. The utility model provides a power station direct air cooling unit air cooling fan crowd overall regulation control method which characterized in that includes:

according to the intensity of the wind field around the air cooling fan group, dividing the running states of the air cooling fan group into 4 running states of no wind, low wind, middle wind and high wind; the air cooling fan group has p rows and q columns, and p.q air cooling fans are counted, different rotating speed adjusting control methods are set for each operating state of the air cooling fan group, and wind speed and wind direction monitoring equipment and adjusting control equipment of a wind field are arranged around the air cooling fan group, so that overall adjusting control of the air cooling fan group and switching between different operating states are realized.

2. The method for overall regulation and control of the air cooling fan group of the direct air cooling unit of the power station as claimed in claim 1 is characterized in that the specific implementation method is as follows:

determining the strength of a wind field around an air cooling fan group, and dividing the wind field into a main wind (1), a reverse wind (2), a cross wind A (3) and a cross wind B (4) according to the field arrangement condition of the air cooling fan group; according to the wind speed v of the main wind direction of the surrounding wind field, the wind field intensity is divided into 4 running states of no wind v approximately equal to 0m/s, low wind 0 < v < 4m/s, wind stroke 4 < v < 10m/s and high wind v > 10 m/s; different adjusting and controlling methods are adopted in each operation state, namely, a regional rotating speed adjusting and controlling method is adopted on the premise that the angle of the fan blades of the air cooling fan group is kept unchanged.

3. The method for overall regulation and control of the air cooling fan group of the direct air cooling unit of the power station as claimed in claim 2, wherein the method for regulation and control of the air cooling fan group in the windless operation state is as follows:

the rotating speed of the air cooling fans at the edge of the air cooling fan group, namely 1, p rows and 1 and q columns of the air cooling fans, is determined by the design rotating speed n_designIs raised to α₁n_designKeeping the designed rotating speed n of the air cooling fan in other areas_designInvariable, α₁The amplification factor of the rotating speed is no wind state, and is not less than 1.1 and not more than α₁≤1.2。

4. The method for overall regulation and control of the air cooling fan group of the direct air cooling unit of the power station as claimed in claim 2, wherein the method for regulation and control of the air cooling fan group in the low wind operation state is as follows:

① when the main wind direction of the surrounding wind field is the main wind (1), the air cooling fan group adopts different adjusting control methods according to the 1-P rows, wherein the P row is the nearest row from the main wind (1), and the P row is the nearest row from the main wind (1)₁0.25P, the first reference number of rows, 1 to P₁Keeping design rotating speed n of air cooler_designInvariable, (P)₁+1) the rotational speed of the traveling air cooler is increased to 1.1n_designThe rotating speed of the p-row air cooler is increased to α₂n_design，(P₁The rotation speed of the middle row from the row +1) to the row p is 1.1n_designGradually increase to α₂n_design，α₂The amplification factor of the rotating speed is equal to or less than 1.15 and is α in a low wind state₂≤1.25；

② when the main wind direction of the wind field around is the reverse wind (2), the air cooling fan group adopts different adjusting control methods according to the P-1 line, wherein the 1 line is the nearest line to the reverse wind (2), and the P line is the nearest line to the reverse wind (2)₂0.75P, a second reference number of rows, P to P₂Keeping design rotating speed n of air cooler_designInvariable, (P)₂-1) speed increase of the traveling air cooler to 1.1n_designAnd the rotating speed of the 1-row air cooler is increased to (α)₂+0.1)n_design，(P₂Line 1) to line 1 intermediate line rotational speed from 1.1n_designGradually increased to (α)₂+0.1)n_design；

③ when the main wind direction of the surrounding wind field is transverse wind A (3), the air cooling fan group adopts different adjusting control methods according to 1-Q rows, wherein the Q row is the closest row to the transverse wind A (3), and Q is the closest row to the transverse wind A (3)₁0.25Q, the first reference column number, 1 to Q₁Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₁+1) row air cooling fan rotation speed is increased to 1.1n_designThe rotating speed of the q-row air cooling fan is increased to α₂n_design，(Q₁The rotation speed of the middle row from the +1) row to the q row is 1.1n_designGradually increase to α₂n_design；

④ when the main wind direction of the surrounding wind field is transverse wind B (4), the air cooling fan group adopts different adjusting control methods according to the Q-1 rows, wherein the 1 row is the closest row to the transverse wind B (4), and Q is the closest row to the transverse wind B (4)₂0.75Q, the second reference column number, Q to Q₂Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₂-1) increase of the speed of the row of air-cooled fans to 1.1n_designThe rotating speed of the 1-row air cooling fan is increased to α₂n_design，(Q₂-1) intermediate row speed from row to row 1 from 1.1n_designGradually increase to α₂n_design。

5. The method for overall regulation and control of the air cooling fan group of the direct air cooling unit of the power station as claimed in claim 2, wherein the method for regulation and control of the air cooling fan group in the wind power running state is as follows:

① when the main wind direction of the surrounding wind field is the main wind (1), the air cooling fan group adopts different adjusting control methods according to the 1-P rows, wherein the P row is the nearest row from the main wind (1), and the P row is the nearest row from the main wind (1)₁0.25P, the first reference number of rows, 1 to P₁Keeping design rotating speed n of air cooler_designInvariable, (P)₁+1) the rotational speed of the traveling air cooler is increased to 1.1n_designThe rotating speed of the p-row air cooler is increased to α₃n_design，(P₁The rotation speed of the middle row from the row +1) to the row p is 1.1n_designGradually increase to α₃n_design，α₃The amplification coefficient of the rotating speed in the stroke state is not less than 1.35 and not more than α₃≤1.45；

② when the main wind direction of the wind field around is the reverse wind (2), the air cooling fan group adopts different adjusting control methods according to the P-1 line, wherein the 1 line is the nearest line to the reverse wind (2), and the P line is the nearest line to the reverse wind (2)₂0.75P, a second reference number of rows, P to P₂Keeping design rotating speed n of air cooler_designInvariable, (P)₂-1) speed increase of the traveling air cooler to 1.1n_designAnd the rotating speed of the 1-row air cooler is increased to (α)₃+0.1)n_design，(P₂Line 1) to line 1 intermediate line rotational speed from 1.1n_designGradually increased to (α)₃+0.1)n_design；

③ when the main wind direction of the surrounding wind field is transverse wind A (3), the air cooling fan group adopts different adjusting control methods according to 1-Q rows, wherein the Q row is the closest row to the transverse wind A (3), and Q is the closest row to the transverse wind A (3)₁0.25Q, the first reference column number, 1 to Q₁Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₁+1) row air cooling fan rotation speed is increased to 1.1n_designThe rotating speed of the q-row air cooling fan is increased to α₃n_design，(Q₁The rotation speed of the middle row from the +1) row to the q row is 1.1n_designGradually increase to α₃n_design；

④ when the main wind direction of the surrounding wind field is transverse wind B (4), the air cooling fan group adopts different adjusting control methods according to the Q-1 rows, wherein the 1 row is the closest row to the transverse wind B (4), and Q is the closest row to the transverse wind B (4)₂0.75Q, the second reference column number, Q to Q₂Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₂-1) increase of the speed of the row of air-cooled fans to 1.1n_designThe rotating speed of the 1-row air cooling fan is increased to α₃n_design，(Q₂-1) intermediate row speed from row to row 1 from 1.1n_designGradually increase to α₃n_design。

6. The method for overall regulation and control of the air cooling fan group of the direct air cooling unit of the power station as claimed in claim 2, wherein the method for regulation and control of the air cooling fan group in the high wind operation state is as follows:

① when the main wind direction of the surrounding wind field is the main wind (1), the air cooling fan group adopts different adjusting control methods according to the 1-P rows, wherein the P row is the nearest row from the main wind (1), and the P row is the nearest row from the main wind (1)₁0.25P, the first reference number of rows, 1 to P₁Keeping design rotating speed n of air cooler_designInvariable, (P)₁+1) the rotational speed of the traveling air cooler is increased to 1.1n_designThe rotating speed of the p-row air cooler is increased to α₄n_design，(P₁The rotation speed of the middle row from the row +1) to the row p is 1.1n_designGradually increase to α₄n_design，α₄The amplification factor of the rotating speed is high in the wind state, and is not less than 1.55 and not more than α₄≤1.65；

② when the main wind direction of the wind field around is the reverse wind (2), the air cooling fan group adopts different adjusting control methods according to the P-1 line, wherein the 1 line is the nearest line to the reverse wind (2), and the P line is the nearest line to the reverse wind (2)₂0.75P, a second reference number of rows, P to P₂Keeping design rotating speed n of air cooler_designInvariable, (P)₂-1) speed increase of the traveling air cooler to 1.1n_designAnd the rotating speed of the 1-row air cooler is increased to (α)₄+0.1)n_design，(P₂Line 1) to line 1 intermediate line rotational speed from 1.1n_designGradually increased to (α)₄+0.1)n_design；

③ when the main wind direction of the surrounding wind field is transverse wind A (3), the air cooling fan group adopts different adjusting control methods according to 1-Q rows, wherein the Q row is the closest row to the transverse wind A (3), and Q is the closest row to the transverse wind A (3)₁0.25Q, the first reference column number, 1 to Q₁Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₁+1) row air cooling fan rotation speed is increased to 1.1n_designThe rotating speed of the q-row air cooling fan is increased to α₄n_design，(Q₁The rotation speed of the middle row from the +1) row to the q row is 1.1n_designGradually increase to α₄n_design；

④ when the main wind direction of the surrounding wind field is transverse wind B (4), the air cooling fan group adopts different adjusting control methods according to the Q-1 rows, wherein the 1 row is the closest row to the transverse wind B (4), and Q is the closest row to the transverse wind B (4)₂0.75Q, the second reference column number, Q to Q₂Column air cooling fan retention designSpeed n_designInvariable, (Q)₂-1) increase of the speed of the row of air-cooled fans to 1.1n_designThe rotating speed of the 1-row air cooling fan is increased to α₄n_design，(Q₂-1) intermediate row speed from row to row 1 from 1.1n_designGradually increase to α₄n_design。

Technical Field

The invention belongs to the technical field of air cooling fan groups used by direct air cooling units of coal-fired power plants, and particularly relates to a method for overall regulation and control of the air cooling fan groups of the direct air cooling units of a power station.

Background

The shortage of water resources makes the water-saving problem of the thermal power plant increasingly become a focus of social attention, the application of the conventional wet cooling unit is limited due to the large consumption of the water resources, and the air cooling unit, particularly the direct air cooling unit, is becoming the best choice in coal-rich and water-deficient areas with excellent water-saving performance. At present, a mechanical ventilation type direct air cooling system is mainly adopted in a direct air cooling system, and an axial flow air cooling fan with large air volume and low pressure head is an important component part of a cold end of an air cooling island and provides the air volume required for cooling an air cooling condenser. However, because the air-cooled fans are directly arranged in the open air, the system has natural defects that the system is easily influenced by the surrounding environment, especially different ambient wind speeds and wind directions can directly influence the operation of the fans, so that the working state of the air-cooled fans deviates from the design value, and normal air volume cannot be provided; meanwhile, the air cooling fans are arranged in groups, so that the working state of a single air cooling fan can be influenced by other fans around.

Because the air-cooled air machine group of the power station has the characteristics of unstable working state and easy influence by external factors, the running state of the air-cooled air machine group can directly influence the actual cooling air volume of each air-cooled condenser, and further influence the safety and the economical efficiency of the running of the whole air-cooled unit. Therefore, it is necessary to develop a general regulation and control technology for air-cooled air machines to improve the safety and economy of the operation of the air-cooled fans and even the air-cooled air machines in the power station.

Disclosure of Invention

The invention provides a method for overall regulating and controlling an air-cooled fan group (ACFG) of a direct air-cooled unit of a power station, aiming at regulating the rotating speed of air-cooled fans in the air-cooled fan group (ACFG) in different areas according to the wind direction and the wind speed around the air-cooled fan group (ACFG) on the premise of not changing the structure and the layout of the air-cooled fan group (ACFG) (the existing air-cooled fans in the air-cooled fan group are the same and the angle of blades of the air-cooled fans is kept unchanged) so as to realize the aim that the average running wind volume of the air-cooled fan group (ACFG) reaches the design wind volume of a single air-cooled fan.

The invention is realized by adopting the following technical scheme:

a power station direct air cooling unit air cooling fan group overall regulation control method comprises the following steps:

according to the intensity of the wind field around the air cooling fan group, dividing the running states of the air cooling fan group into 4 running states of no wind, low wind, middle wind and high wind; the air cooling fan group has p rows and q columns, and p.q air cooling fans are counted, different rotating speed adjusting control methods are set for each operating state of the air cooling fan group, and wind speed and wind direction monitoring equipment and adjusting control equipment of a wind field are arranged around the air cooling fan group, so that overall adjusting control of the air cooling fan group and switching between different operating states are realized.

The further improvement of the invention is that the concrete implementation method is as follows:

determining the strength of a wind field around an air cooling fan group, and dividing the wind field into a main wind, a reverse wind, a cross wind A and a cross wind B according to the field arrangement condition of the air cooling fan group; according to the wind speed v of the main wind direction of the surrounding wind field, the wind field intensity is divided into 4 running states of no wind v approximately equal to 0m/s, low wind 0 < v < 4m/s, wind stroke 4 < v < 10m/s and high wind v > 10 m/s; different adjusting and controlling methods are adopted in each operation state, namely, a regional rotating speed adjusting and controlling method is adopted on the premise that the angle of the fan blades of the air cooling fan group is kept unchanged.

The invention has the further improvement that the adjusting and controlling method of the air cooling fan group in the windless running state is as follows:

the rotating speed of the air cooling fans at the edge of the air cooling fan group, namely 1, p rows and 1 and q columns of the air cooling fans, is determined by the design rotating speed n_designIs raised to α₁n_designKeeping the designed rotating speed n of the air cooling fan in other areas_designInvariable, α₁The amplification factor of the rotating speed is no wind state, and is not less than 1.1 and not more than α₁≤1.2。

The invention further improves that the method for adjusting and controlling the air cooling fan group in the low wind running state comprises the following steps:

① when the main wind direction of the surrounding wind field is the main wind, the air cooling fan group adopts different adjusting control methods according to the 1-P rows, wherein the P row is the nearest row to the main wind, and the P row is the nearest row to the main wind₁0.25P, the first reference number of rows, 1 to P₁Keeping design rotating speed n of air cooler_designInvariable, (P)₁+1) the rotational speed of the traveling air cooler is increased to 1.1n_designThe rotating speed of the p-row air cooler is increased to α₂n_design，(P₁The rotation speed of the middle row from the row +1) to the row p is 1.1n_designGradually increase to α₂n_design，α₂The amplification factor of the rotating speed is equal to or less than 1.15 and is α in a low wind state₂≤1.25；

② when the main wind direction of the wind field around is reverse wind, the air cooling fan group adopts different adjusting control methods according to the P-1 line, wherein the 1 line moves closest to the reverse wind, and the P line moves closest to the reverse wind₂0.75P, a second reference number of rows, P to P₂Keeping design rotating speed n of air cooler_designInvariable, (P)₂-1) speed of the air-cooling fanIncrease to 1.1n_designAnd the rotating speed of the 1-row air cooler is increased to (α)₂+0.1)n_design，(P₂Line 1) to line 1 intermediate line rotational speed from 1.1n_designGradually increased to (α)₂+0.1)n_design；

③ when the main wind direction of the surrounding wind field is transverse wind A, the air cooling fan group adopts different adjusting control methods according to 1-Q rows, wherein the Q row is the closest row to the transverse wind A, and Q is the closest row to the transverse wind A₁0.25Q, the first reference column number, 1 to Q₁Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₁+1) row air cooling fan rotation speed is increased to 1.1n_designThe rotating speed of the q-row air cooling fan is increased to α₂n_design，(Q₁The rotation speed of the middle row from the +1) row to the q row is 1.1n_designGradually increase to α₂n_design；

④ when the main wind direction of the surrounding wind field is cross wind B, the air cooling fan group adopts different adjusting control methods according to the Q-1 rows, wherein the 1 row is the closest row to the cross wind, and Q is₂0.75Q, the second reference column number, Q to Q₂Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₂-1) increase of the speed of the row of air-cooled fans to 1.1n_designThe rotating speed of the 1-row air cooling fan is increased to α₂n_design，(Q₂-1) intermediate row speed from row to row 1 from 1.1n_designGradually increase to α₂n_design。

The invention further improves that the adjusting and controlling method of the air cooling fan group in the stroke running state is as follows:

① when the main wind direction of the surrounding wind field is the main wind, the air cooling fan group adopts different adjusting control methods according to the 1-P rows, wherein the P row is the nearest row to the main wind, and the P row is the nearest row to the main wind₁0.25P, the first reference number of rows, 1 to P₁Keeping design rotating speed n of air cooler_designInvariable, (P)₁+1) the rotational speed of the traveling air cooler is increased to 1.1n_designThe rotating speed of the p-row air cooler is increased to α₃n_design，(P₁The rotation speed of the middle row from the row +1) to the row p is 1.1n_designGradually increase to α₃n_design，α₃For the state of strokeRapid amplification factor of 1.35- α₃≤1.45；

② when the main wind direction of the wind field around is reverse wind, the air cooling fan group adopts different adjusting control methods according to the P-1 line, wherein the 1 line moves closest to the reverse wind, and the P line moves closest to the reverse wind₂0.75P, a second reference number of rows, P to P₂Keeping design rotating speed n of air cooler_designInvariable, (P)₂-1) speed increase of the traveling air cooler to 1.1n_designAnd the rotating speed of the 1-row air cooler is increased to (α)₃+0.1)n_design，(P₂Line 1) to line 1 intermediate line rotational speed from 1.1n_designGradually increased to (α)₃+0.1)n_design；

③ when the main wind direction of the surrounding wind field is transverse wind A, the air cooling fan group adopts different adjusting control methods according to 1-Q rows, wherein the Q row is the closest row to the transverse wind A, and Q is the closest row to the transverse wind A₁0.25Q, the first reference column number, 1 to Q₁Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₁+1) row air cooling fan rotation speed is increased to 1.1n_designThe rotating speed of the q-row air cooling fan is increased to α₃n_design，(Q₁The rotation speed of the middle row from the +1) row to the q row is 1.1n_designGradually increase to α₃n_design；

④ when the main wind direction of the surrounding wind field is cross wind B, the air cooling fan group adopts different adjusting control methods according to Q-1 rows, wherein the 1 row is the closest row to the cross wind B, and Q is₂0.75Q, the second reference column number, Q to Q₂Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₂-1) increase of the speed of the row of air-cooled fans to 1.1n_designThe rotating speed of the 1-row air cooling fan is increased to α₃n_design，(Q₂-1) intermediate row speed from row to row 1 from 1.1n_designGradually increase to α₃n_design。

The invention further improves that the method for adjusting and controlling the air cooling fan group in the high wind running state comprises the following steps:

① when the main wind direction of the surrounding wind field is the main wind, the air cooling fan group adopts different adjusting control methods according to the 1-P rows, wherein the P row is the nearest row to the main wind, and the P row is the nearest row to the main wind₁＝0.25P, is the first reference number of rows, 1 to P₁Keeping design rotating speed n of air cooler_designInvariable, (P)₁+1) the rotational speed of the traveling air cooler is increased to 1.1n_designThe rotating speed of the p-row air cooler is increased to α₄n_design，(P₁The rotation speed of the middle row from the row +1) to the row p is 1.1n_designGradually increase to α₄n_design，α₄The amplification factor of the rotating speed is high in the wind state, and is not less than 1.55 and not more than α₄≤1.65；

② when the main wind direction of the wind field around is reverse wind, the air cooling fan group adopts different adjusting control methods according to the P-1 line, wherein the 1 line moves closest to the reverse wind, and the P line moves closest to the reverse wind₂0.75P, a second reference number of rows, P to P₂Keeping design rotating speed n of air cooler_designInvariable, (P)₂-1) speed increase of the traveling air cooler to 1.1n_designAnd the rotating speed of the 1-row air cooler is increased to (α)₄+0.1)n_design，(P₂Line 1) to line 1 intermediate line rotational speed from 1.1n_designGradually increased to (α)₄+0.1)n_design；

③ when the main wind direction of the surrounding wind field is transverse wind A, the air cooling fan group adopts different adjusting control methods according to 1-Q rows, wherein the Q row is the closest row to the transverse wind A, and Q is the closest row to the transverse wind A₁0.25Q, the first reference column number, 1 to Q₁Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₁+1) row air cooling fan rotation speed is increased to 1.1n_designThe rotating speed of the q-row air cooling fan is increased to α₄n_design，(Q₁The rotation speed of the middle row from the +1) row to the q row is 1.1n_designGradually increase to α₄n_design；

④ when the main wind direction of the surrounding wind field is cross wind B, the air cooling fan group adopts different adjusting control methods according to Q-1 rows, wherein the 1 row is the closest row to the cross wind B, and Q is₂0.75Q, the second reference column number, Q to Q₂Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₂-1) increase of the speed of the row of air-cooled fans to 1.1n_designThe rotating speed of the 1-row air cooling fan is increased to α₄n_design，(Q₂-1) intermediate row speed from row to row 1 from 1.1n_designGradually increase to α₄n_design。

The invention has at least the following beneficial technical effects:

the inlet airflow of the air cooling fans in the peripheral row and column of the Air Cooling Fan Group (ACFG) is easily influenced by the surrounding wind field, the inlet negative pressure is obviously larger, and the air cooling fans in the peripheral row and column need to overcome larger system resistance. Therefore, the working pressure of the air-cooled fans at different positions of an air-cooled fan group (ACFG) is different, and further the working air volume of the air-cooled fans at different positions is uneven. Therefore, the invention provides a method for overall regulating and controlling an air-cooled fan group (ACFG) of a direct air-cooled unit of a power station, which can regulate the rotating speed of different air-cooled fans in the air-cooled fan group (ACFG) in different areas according to the wind direction and the wind speed change of a surrounding wind field on the premise of keeping the angle of a blade of the air-cooled fan unchanged, so that all the air-cooled fans can reach the designed wind volume in the actual operation, the requirement of the actual cooling wind volume of an air-cooled condenser is met, and the safe and stable operation of the air-cooled unit is ensured.

Drawings

Fig. 1 is a schematic view of an air-cooled fan group and an ambient wind field according to the present invention.

Wherein, ACFG-air-cooled fan group, 1-main air guide, 2-counter air, 3-cross air A, 4-cross air B, P-air-cooled fan group total line number, P₁-a first reference number of rows, P₂-a second reference number of rows, Q-total number of columns, Q, of air-cooled chiller trains₁-a first reference column number, Q₂-a second reference number of columns, n-air cooling fan speed, n_designDesign speed of air-cooled fan, v-wind speed, α₁-windless speed amplification factor, α₂Low wind speed amplification factor, α₃-stroke state speed amplification factor, α₄-high wind regime speed amplification factor.

Fig. 2 is a schematic diagram of an embodiment of the present invention.

Wherein, in the main air-guide middle-speed operation state, the 1 st to 2 nd air-cooling fans keep the design rotating speed (n)_design) The rotating speed of the No. 3 air cooler is improved to 1.1n without change_designThe rotating speeds of the 4 th to 6 th air-cooling fans are respectively increased to 1.15n_design、1.2n_designAnd 1.3n_designThe rotating speed of the No. 7 air cooler is increased to 1.4n_design。

Detailed Description

The invention is further described below with reference to the following figures and examples.

The invention provides a method for overall regulating and controlling an air-cooled fan group (ACFG) of a direct air-cooled unit of a power station, which comprises the following steps: according to the intensity of the wind field around the air-cooled fan group (ACFG), the running states of the air-cooled fan group (ACFG) are divided into 4 running states of no wind (v is approximately equal to 0m/s), low wind (0 is more than v and less than 4m/s), wind stroke (4 is more than or equal to v and less than 10m/s) and high wind (v is more than 10 m/s). The air-cooled fan group (ACFG) has p rows and q columns, and p.q air-cooled fans are counted. Different rotating speed regulation control methods are respectively set for the air-cooled fan group (ACFG) in each running state. And wind field (including wind speed and wind direction) monitoring equipment and adjusting control equipment are arranged around the Air Cooling Fan Group (ACFG) and are used for realizing the overall adjusting control and the switching between different running states of the Air Cooling Fan Group (ACFG). The specific implementation method comprises the following steps:

1. and determining the intensity of the wind field around the air-cooled fan group (ACFG). According to the arrangement situation of an air-cooled air blower group (ACFG) on site, a wind field is divided into a main wind 1, a reverse wind 2, a crosswind A3 and a crosswind B4. According to the wind speed v of the main wind direction of the surrounding wind field, the wind field intensity is divided into 4 running states of no wind (v is approximately equal to 0m/s), low wind (0 is more than v and less than 4m/s), medium wind (4 is more than or equal to v and less than 10m/s) and high wind (v is more than 10 m/s). Different adjusting control methods are adopted in each operation state, namely, a regional rotating speed adjusting control method is adopted on the premise that the angle of the fan blades of the Air Cooling Fan Group (ACFG) is kept unchanged.

2. The air-cooled air machine group (ACFG) adjusting and controlling method under the windless (v is approximately equal to 0m/s) running state comprises the following steps: the rotating speed of an air-cooled fan group (ACFG) edge air-cooled fan (namely 1, p rows and 1 and q columns of air-cooled fans) is designed to be n_designIs raised to α₁n_design(α₁The amplification factor of the rotating speed is no wind state, and is not less than 1.1 and not more than α₁Less than or equal to 1.2), keeping the rotating speed of the air cooling fan in other areas at the designed rotating speed n_designAnd is not changed.

3. The air-cooled air blower group (ACFG) adjusting control method under the low wind (v is more than 0 and less than 4m/s) running state:

① when the main wind direction of the wind field around is the main wind 1, the air-cooled wind machine group (ACFG) adopts different adjusting control methods according to the 1-P lines, wherein the P line is the nearest line from the main wind 1, and the P line is the nearest line from the main wind 1₁0.25P (rounded) as the first reference number of rows, 1 to P₁Keeping design rotating speed n of air cooler_designInvariable, (P)₁+1) the rotational speed of the traveling air cooler is increased to 1.1n_designThe rotating speed of the p-row air cooler is increased to α₂n_design(α₂The amplification factor of the rotating speed is equal to or less than 1.15 and is α in a low wind state₂≤1.25)，(P₁The rotation speed of the middle row from the row +1) to the row p is 1.1n_designGradually increase to α₂n_design；

② when the main wind direction of the surrounding wind field is reverse wind 2, the Air Cooling Fan Group (ACFG) adopts different adjusting control methods according to the P-1 line, wherein the 1 line is nearest to the reverse wind 2, and the P line is P₂0.75P (rounded) as the second reference number of lines, P to P₂Keeping design rotating speed n of air cooler_designInvariable, (P)₂-1) speed increase of the traveling air cooler to 1.1n_designAnd the rotating speed of the 1-row air cooler is increased to (α)₂+0.1)n_design，(P₂Line 1) to line 1 intermediate line rotational speed from 1.1n_designGradually increased to (α)₂+0.1)n_design；

③ when the main wind direction of the surrounding wind field is transverse wind A3, the air-cooled air blower group (ACFG) adopts different regulation control methods according to 1-Q rows, wherein the Q row is the closest row to the transverse wind A3, and the Q row is the closest row to the transverse wind A3₁0.25Q (rounded) as the first reference column, 1 to Q₁Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₁+1) row air cooling fan rotation speed is increased to 1.1n_designThe rotating speed of the q-row air cooling fan is increased to α₂n_design，(Q₁The rotation speed of the middle row from the +1) row to the q row is 1.1n_designGradually increase to α₂n_design；

④ when the main wind direction of the wind field around is transverse wind B4, the air-cooled fan group (ACFG) adopts different regulation control methods according to the Q-1 row, wherein the 1 row is the closest row to the transverse wind B, and the Q row is the closest row to the transverse wind B₂0.75q (take)Integer) of a second reference column number, Q to Q₂Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₂-1) increase of the speed of the row of air-cooled fans to 1.1n_designThe rotating speed of the 1-row air cooling fan is increased to α₂n_design，(Q₂-1) intermediate row speed from row to row 1 from 1.1n_designGradually increase to α₂n_design。

4. An air-cooled air blower group (ACFG) adjusting and controlling method under the running state of stroke (v is more than or equal to 4 and less than 10 m/s):

① when the main wind direction of the wind field around is the main wind 1, the air-cooled wind machine group (ACFG) adopts different adjusting control methods according to the 1-P lines, wherein the P line is the nearest line from the main wind 1, and the P line is the nearest line from the main wind 1₁0.25P (rounded) as the first reference number of rows, 1 to P₁Keeping design rotating speed n of air cooler_designInvariable, (P)₁+1) the rotational speed of the traveling air cooler is increased to 1.1n_designThe rotating speed of the p-row air cooler is increased to α₃n_design(α₃The amplification coefficient of the rotating speed in the stroke state is not less than 1.35 and not more than α₃≤1.45)，(P₁The rotation speed of the middle row from the row +1) to the row p is 1.1n_designGradually increase to α₃n_design；

② when the main wind direction of the surrounding wind field is reverse wind 2, the Air Cooling Fan Group (ACFG) adopts different adjusting control methods according to the P-1 line, wherein the 1 line is nearest to the reverse wind 2, and the P line is P₂0.75P (rounded) as the second reference number of lines, P to P₂Keeping design rotating speed n of air cooler_designInvariable, (P)₂-1) speed increase of the traveling air cooler to 1.1n_designAnd the rotating speed of the 1-row air cooler is increased to (α)₃+0.1)n_design，(P₂Line 1) to line 1 intermediate line rotational speed from 1.1n_designGradually increased to (α)₃+0.1)n_design；

③ when the main wind direction of the surrounding wind field is transverse wind A3, the air-cooled air blower group (ACFG) adopts different regulation control methods according to 1-Q rows, wherein the Q row is the closest row to the transverse wind A3, and the Q row is the closest row to the transverse wind A3₁0.25Q (rounded) as the first reference column, 1 to Q₁Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₁+1) column blankThe rotating speed of the air cooler is increased to 1.1n_designThe rotating speed of the q-row air cooling fan is increased to α₃n_design，(Q₁The rotation speed of the middle row from the +1) row to the q row is 1.1n_designGradually increase to α₃n_design；

④ when the main wind direction of the wind field around is transverse wind B4, the air-cooled air blower group (ACFG) adopts different regulation control methods according to Q-1 rows, wherein 1 row is the row closest to the transverse wind B4, and Q is the row closest to the transverse wind B4₂0.75Q (rounded) as the second reference column number, Q to Q₂Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₂-1) increase of the speed of the row of air-cooled fans to 1.1n_designThe rotating speed of the 1-row air cooling fan is increased to α₃n_design，(Q₂-1) intermediate row speed from row to row 1 from 1.1n_designGradually increase to α₃n_design。

5. An air-cooled air blower group (ACFG) adjusting and controlling method under the high wind (v is more than 10m/s) running state:

① when the main wind direction of the wind field around is the main wind 1, the air-cooled wind machine group (ACFG) adopts different adjusting control methods according to the 1-P lines, wherein the P line is the nearest line from the main wind 1, and the P line is the nearest line from the main wind 1₁0.25P (rounded) as the first reference number of rows, 1 to P₁Keeping design rotating speed n of air cooler_designInvariable, (P)₁+1) the rotational speed of the traveling air cooler is increased to 1.1n_designThe rotating speed of the p-row air cooler is increased to α₄n_design(α₄The amplification factor of the rotating speed is high in the wind state, and is not less than 1.55 and not more than α₄≤1.65)，(P₁The rotation speed of the middle row from the row +1) to the row p is 1.1n_designGradually increase to α₄n_design；

② when the main wind direction of the surrounding wind field is reverse wind 2, the Air Cooling Fan Group (ACFG) adopts different adjusting control methods according to the P-1 line, wherein the 1 line is nearest to the reverse wind 2, and the P line is P₂0.75P (rounded) as the second reference number of lines, P to P₂Keeping design rotating speed n of air cooler_designInvariable, (P)₂-1) speed increase of the traveling air cooler to 1.1n_designAnd the rotating speed of the 1-row air cooler is increased to (α)₄+0.1)n_design，(P₂Line 1) to line 1The middle line rotating speed is controlled by 1.1n_designGradually increased to (α)₄+0.1)n_design；

③ when the main wind direction of the surrounding wind field is transverse wind A3, the air-cooled air blower group (ACFG) adopts different regulation control methods according to 1-Q rows, wherein the Q row is the closest row to the transverse wind A3, and the Q row is the closest row to the transverse wind A3₁0.25Q (rounded) as the first reference column, 1 to Q₁Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₁+1) row air cooling fan rotation speed is increased to 1.1n_designThe rotating speed of the q-row air cooling fan is increased to α₄n_design，(Q₁The rotation speed of the middle row from the +1) row to the q row is 1.1n_designGradually increase to α₄n_design；

④ when the main wind direction of the wind field around is transverse wind B4, the air-cooled air blower group (ACFG) adopts different regulation control methods according to Q-1 rows, wherein 1 row is the row closest to the transverse wind B4, and Q is the row closest to the transverse wind B4₂0.75Q (rounded) as the second reference column number, Q to Q₂Keeping designed rotating speed n of row air cooling fan_designInvariable, (Q)₂-1) increase of the speed of the row of air-cooled fans to 1.1n_designThe rotating speed of the 1-row air cooling fan is increased to α₄n_design，(Q₂-1) intermediate row speed from row to row 1 from 1.1n_designGradually increase to α₄n_design。