Anti-surge automatic control method for high-speed blower

Abstract

The application discloses an anti-surge automatic control method of a high-speed air blower, the high-speed air blower and an aquaculture system, relates to the high-speed air blower in the field of aquaculture, and comprises the following steps: inputting fan performance curve parameters into a fan controller; obtaining real-time operation parameters of the high-speed air blower by a sensor and inputting the real-time operation parameters into the fan controller; comparing the received real-time operation parameters with the parameterized fan performance curve by the fan controller to determine the working state of the fan; and when the high-speed air blower is in a surge state, the controller controls the high-speed air blower to accelerate and accelerate to a preset air speed. The method provided by the application can prevent the high-speed air blower from surging when air is delivered to pool water.

Description

Technical Field

[0001] This invention relates to high-speed blowers for aquaculture, specifically to an automatic anti-surge control method for high-speed blowers, a high-speed blower, and an aquaculture system. Background Technology

[0002] With the increasing demand for aquatic products such as fish and shrimp in recent years, fishing alone can no longer meet the demand. Therefore, aquaculture has become a trend. Aquaculture mainly relies on blowers to continuously supply air to the bottom of the pond to meet the oxygen requirements of the fish and shrimp. Aquaculture involves high stocking densities; if air is not supplied to the bottom of the pond for an extended period, a large number of fish and shrimp will die. Some aquaculture systems use recirculating water, leading to significant fluctuations in water levels. Furthermore, aquaculture places high demands on energy conservation.

[0003] High-speed blowers, with their large air volume, are suitable for aquaculture. However, when the inlet flow rate of a high-speed blower is too low, it will experience surge, causing periodic vibrations in the blower and piping, generating noise, accelerating damage to bearings and seals, and leading to serious consequences. Therefore, appropriate anti-surge measures are necessary, generally including manual anti-surge methods and traditional automatic control methods. Manual anti-surge methods involve professionals monitoring the blower's operating status in real time; when surge occurs, the vent valve is manually opened. Traditional automatic anti-surge methods use temperature, pressure, and humidity sensors installed at the blower's inlet and outlet to calculate the inlet flow rate and determine if the blower is in a surge state. When surge occurs, the controller opens the vent valve. However, regardless of whether it's a manual or automatic anti-surge method, the ultimate measure is to open the vent valve, releasing the blower's gas into the air. But at this time, the pond water is without gas input, and fish and shrimp will die in large numbers within minutes, causing significant economic losses. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an automatic anti-surge control method for high-speed blowers to prevent surge when the high-speed blower delivers air to the pool water.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic anti-surge control method for a high-speed blower includes the following steps:

[0007] The fan performance curve is parameterized and then input into the fan controller. The real-time operating parameters of the high-speed blower are obtained by the sensor and input into the fan controller. The fan controller compares the received real-time operating parameters with the parameterized fan performance curve to determine the working status of the fan. When the high-speed blower is in a surge state, the controller controls the high-speed blower to accelerate to the preset wind speed.

[0008] Optionally, the wind turbine performance curves include an anti-surge curve, a maximum speed PW curve, a minimum recommended speed PW curve, and a maximum power curve, and the four curves are connected.

[0009] Optionally, the fan controller controls the high-speed blower to accelerate at the following wind speed:

[0010]

[0011] Where, n x Let n be the wind speed at each acceleration. max n is the maximum speed of the high-speed blower. a is the operating speed of the high-speed blower when it is in surge, and n is the number of accelerations.

[0012] Optionally, the controller controls the high-speed blower to accelerate to the preset wind speed, which includes the following sub-steps:

[0013] Take the running data after several accelerations, fit the power-static internal efficiency data of each running data to form a fitting curve, and obtain the extreme points of the fitting curve.

[0014] The wind speed corresponding to the extreme point is the preset wind speed.

[0015] Optionally, the power-static internal efficiency data for each operating data point can be fitted using the least squares method.

[0016] Optionally, the formula for curve fitting using the least squares method is:

[0017]

[0018] Where w is the controller output power. To calculate the static pressure internal efficiency, parameters a0, a1, and a2 are calculated and then fitted to form a curve.

[0019] Optionally, if the x-coordinate of the extreme point is located between the running data of the first acceleration and the last acceleration, the wind speed corresponding to the extreme point is the preset wind speed; if the x-coordinate of the extreme point is located to the left of the first acceleration, the wind speed corresponding to the first acceleration is the preset wind speed; if the x-coordinate of the extreme point is located to the right of the last acceleration, the wind speed corresponding to the last acceleration is the preset wind speed.

[0020] Optionally, the formula for calculating the static pressure internal efficiency is:

[0021]

[0022] in, The static pressure value is represented by Q, the flow rate is represented by W, and the fan shaft power is represented by W. The flow rate and the static pressure value are measured by a sensor.

[0023] The present invention has the following beneficial effects:

[0024] The technical solution provided by this invention fits and parameterizes the fan's operating curve, and determines whether the fan's current operating state is within the normal range of the operating curve through real-time monitoring, thereby determining whether the fan's current operating state is normal. When it is determined that a change in the fan's operating conditions has caused a surge phenomenon, the controller automatically performs an acceleration action to overcome the surge. At the same time, it obtains an efficiency-static pressure internal efficiency curve by fitting several data points, enabling the high-speed blower to operate at the highest static pressure internal efficiency.

[0025] In addition, the present invention also provides a high-speed blower controlled by the anti-surge automatic control method described in any one of the above claims.

[0026] Meanwhile, the present invention also provides an aquaculture system, including an aquaculture pond and the aforementioned high-speed blower, wherein the high-speed blower delivers air into the aquaculture pond.

[0027] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of the present invention will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of the present invention. In addition, each of these features, elements and components appearing in the following text and drawings is a plurality of, and different symbols or numbers are used for convenience of representation, but all represent parts with the same or similar construction or function. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the performance curve of the high-speed blower in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram illustrating the monitoring and judgment of the operating status of a high-speed blower in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the fitting curve in an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the operation of the high-speed blower in an embodiment of the present invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0034] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this patent. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0035] Example:

[0036] This embodiment provides an automatic control method for preventing surge in a high-speed blower. In this embodiment, the high-speed blower is used in aquaculture to supply air to pond water to increase its oxygen content. However, if the inlet flow rate of the high-speed blower is too low, surge will occur. Therefore, this embodiment provides an automatic control method for suppressing surge in a high-speed blower, including the following steps:

[0037] The fan performance curves are parameterized and input into the fan controller. These performance curves are obtained from multiple performance tests of this high-speed blower model, including the anti-surge curve, the maximum speed PW curve, the minimum recommended speed PW curve, and the maximum power curve. These four curves are combined into a single region. The vertical axis represents the pressure value measured by the pressure sensor, and the horizontal axis represents the controller's output power. Figure 1 As shown.

[0038] The real-time operating parameters of the high-speed blower are acquired by sensors and input into the blower controller. In this embodiment, the sensors used include pressure sensors and flow sensors, which are commonly used sensors in the prior art and are not limited here.

[0039] The wind turbine controller compares the received real-time operating parameters with the parameterized wind turbine performance curves to determine the wind turbine's operating status, such as... Figure 2 As shown. By monitoring in real time to determine whether the current operating status of the blower is within the normal range of the blower's operating curve, it can be determined whether the blower is operating normally: if the operating point is within the area formed by the four curves, it indicates that the high-speed blower is operating normally; if the operating point is to the left of the surge line or on the surge line, it indicates that the high-speed blower is in a surge state.

[0040] When the high-speed blower is in a surge state, the controller controls the high-speed blower to accelerate to a preset wind speed. In this embodiment, it is preferable to perform at least 5 accelerations. The actual number of accelerations required is determined by those skilled in the art based on comprehensive factors such as the volume and oxygen demand of the aquaculture pond, and is not limited here. The wind speed at which the blower controller controls the high-speed blower to accelerate is:

[0041]

[0042] Where, n x Let n be the wind speed at each acceleration. max n is the maximum speed of the high-speed blower. a The speed at which the high-speed blower is in surge mode is denoted by n, which is the number of accelerations. In this embodiment, n is 5.

[0043] Setting the preset wind speed includes the following sub-steps:

[0044] Taking the operating data after 5 accelerations in this embodiment, the static pressure internal efficiency is calculated according to the following formula:

[0045]

[0046] in, The static pressure is represented by Q, the flow rate is represented by W, and the fan shaft power is represented by W. The flow rate is measured by a flow sensor, and the static pressure is measured by a pressure sensor.

[0047] The power-static pressure internal efficiency data for each operating data point are fitted using the least squares method according to the following formula to form a fitted curve, as follows: Figure 3 As shown:

[0048]

[0049] Where w is the controller output power. To calculate the static pressure internal efficiency, parameters a0, a1, and a2 are calculated and fitted to form a curve. The extreme points of the fitted curve are also obtained.

[0050] If the x-coordinate of the extreme point is located between the running data of the first acceleration and the last acceleration, then the wind speed corresponding to the extreme point is the preset wind speed; if the x-coordinate of the extreme point is to the left of the first acceleration, then the wind speed corresponding to the first acceleration is the preset wind speed; if the x-coordinate of the extreme point is to the right of the last acceleration, then the wind speed corresponding to the last acceleration is the preset wind speed.

[0051] The method provided in this embodiment automatically accelerates the blower to overcome surge when it is determined that the blower's operating conditions have changed and caused the blower to surge. At the same time, it obtains the efficiency-static pressure internal efficiency curve by fitting 5 data points, so that the high-speed blower can operate at the highest static pressure internal efficiency.

[0052] This embodiment also provides a high-speed blower, controlled by the aforementioned anti-surge automatic control method. Furthermore, this embodiment also provides an aquaculture system, such as... Figure 4 As shown, the system includes an aquaculture tank 1 and a high-speed blower 2, which is controlled by the aforementioned anti-surge automatic control method. The high-speed blower 2 supplies air to the aquaculture tank 1 through an air supply pipe 3 to increase the oxygen content of the water in the aquaculture tank 1. Simultaneously, an air vent valve 4 is also installed on the air supply pipe 3; the aquaculture tank 1 also has an inlet 5 and an outlet 6 for water circulation.

[0053] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. An anti-surge automatic control method of a high-speed blower, characterized by, The anti-surge automatic control method comprises the following steps: The fan performance curve is parameterized and input into the fan controller; real-time running parameters of the high-speed blower are obtained by a sensor and input into the fan controller, the fan controller compares the received real-time running parameters with the parameterized fan performance curve to determine the working state of the fan; when the high-speed blower is in a surge state, the controller controls the high-speed blower to accelerate to a preset wind speed; the controller controls the high-speed blower to accelerate to a preset wind speed, which comprises the following sub-steps: A plurality of running data after acceleration are taken, power-static pressure internal efficiency data of each running data are fitted to form a fitting curve, and an extreme point of the fitting curve is obtained; The wind speed corresponding to the extreme point is the preset wind speed; the power-static pressure internal efficiency data of each running data are fitted by using the least square method; and a calculation formula of the static pressure internal efficiency is as follows: wherein, is the static pressure value, Q is the flow size, W 轴 is the fan shaft power, said flow and said static pressure value being measured by sensors.

2. The anti-surge automatic control method according to claim 1, characterized by, The fan performance curve comprises an anti-surge line, a highest speed P-W curve, a lowest recommended speed P-W curve and a maximum power line, and the four curves are surrounded, and w is the output power of the controller.

3. The surge prevention automatic control method according to claim 1, characterized by, The wind speed at which the fan controller controls the high-speed blower to accelerate is: wherein n x is the wind speed for each acceleration, n max is the maximum rotational speed of the high-speed blower, n a is the operational rotational speed of the high-speed blower at the surge, and n is the number of accelerations.

4. The surge-proof automatic control method according to claim 1, wherein If the abscissa of the extreme point is located between the running data of the first acceleration and the last acceleration, the wind speed corresponding to the extreme point is the preset wind speed; if the abscissa of the extreme point is located to the left of the first acceleration, the wind speed corresponding to the first acceleration is the preset wind speed; and if the abscissa of the extreme point is located to the right of the last acceleration, the wind speed corresponding to the last acceleration is the preset wind speed.

5. A high speed blower characterized by, The high-speed blower is controlled by the anti-surge automatic control method in any one of claims 1 to 4.

6. An aquaculture system comprising a rearing tank, characterised in that, The aquaculture system further comprises the high-speed blower in claim 5, and the high-speed blower sends air into the culture pond.

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