CN212055226U - Fan anti-surge control system - Google Patents
Fan anti-surge control system Download PDFInfo
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- CN212055226U CN212055226U CN202020596436.2U CN202020596436U CN212055226U CN 212055226 U CN212055226 U CN 212055226U CN 202020596436 U CN202020596436 U CN 202020596436U CN 212055226 U CN212055226 U CN 212055226U
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Abstract
The utility model relates to a fan surge prevention control system belongs to fan surge control technical field. The utility model comprises a fan, an inlet pipeline, an outlet pipeline and an emptying pipeline which are connected with the fan; the anti-surge pipeline is respectively connected with the inlet pipeline, the outlet pipeline and the emptying pipeline to form a closed loop; the controller comprises a receiving unit and a control unit, the receiving unit receives input signals transmitted by the inlet flow display, the outlet pressure transmitter and the emptying flow regulator and transmits the input signals to the control unit, and when the control unit judges that surge occurs, the control unit controls the opening degrees of the inlet valve and the emptying valve to perform anti-surge control; the utility model is suitable for the chemical enterprises to realize the automatic control by transforming the original device, and the cost is extremely low; the minimum flow and the warning flow of the fan can be quickly obtained according to the pressure at the outlet of the fan, the running condition of the fan can be monitored at any time in actual production, and the stable running of the fan is realized.
Description
Technical Field
The utility model relates to a fan surge prevention control system belongs to fan surge control technical field.
Background
Surging is the phenomenon that the working point of a fan changes suddenly and repeatedly, and gas suddenly flows in and out from the fan, so that a rotor is subjected to alternating load, a machine body vibrates and spreads to a connected pipeline, and the phenomenon is shown in that pointers of a flowmeter and a pressure gauge swing greatly.
When the fan runs in a pipeline system, the supply and demand balance of energy must be satisfied. If a new stable balance can be established under the external interference in the balance, the operation condition which can still be recovered after the interference is eliminated is called as a stable condition. On the contrary, after the external interference and the interference elimination, a new balance cannot be established and the original state is restored after the stabilization, but an operation condition of flow transition or severe fluctuation occurs, which is called as an unstable condition.
As shown in FIG. 3, a curve L-D-C-B-A is a performance curve of the fan, P I, P II, P III are pipeline characteristic curves, and the intersection points D, E, k, A, B of the fan performance curve and the pipeline characteristic curves are called fan working points. The p-qv performance curve of the fan has a hump, and the working pipeline system capacity of the fan is large. The large-capacity pipeline system is characterized in that: when the flow rate required by the user changes, the pressure of the gas in the pipe system does not change immediately, which lags behind the change in the operating conditions. When the working point is located in the descending section of the performance curve of the fan, such as A, B point in the figure, the wind pressure change of the fan can adapt to the change of the pipeline load, and the operation is stable. The K point is the critical point of the stable working condition, if the working condition is adjusted, qv is less than qvk, the wind pressure generated by the fan is instantaneously lower than the pressure of the gas in the pipe system, and the flow suddenly drops to zero. However, at this time, the wind pressure pd is smaller than pk, and the balance still cannot be achieved, so the working point will move to the second quadrant L point in the diagram rapidly, and the supply and demand balance of energy is achieved. At the moment, one part of the air storage in the system supplies air to the user, and the other part of the air storage is discharged from the inlet of the fan, so that the pressure in the pipeline system is rapidly reduced, and the working point of the fan is moved to the point D along the performance curve. If the pressure of the gas in the pipeline system is reduced to the pressure below zero flow, the working point of the fan is rapidly moved to the point C to be put into operation, the fan continues to supply gas to the pipeline system, if the pressure of the pipeline system continues to rise, the output flow is still less than qvk, the process is repeatedly circulated according to K-L-D-C-K, and the working point of the fan cannot fall to the point E all the time. This unstable condition is a surging phenomenon. Surge is extremely destructive to the fan and is more dangerous than chemical systems. Therefore, the avoidance of the surge of the fan is an extremely important link in the operation of the chemical machinery.
The most effective means for avoiding the surge of the fan is to control the working point of the fan to fall on the right side of the hump top of the fan performance curve, namely to control the flow of the fan to be not less than the minimum flow of the fan surge. However, because the operation condition of the fan is complex, it is difficult to obtain perfect surge data by a theoretical calculation method.
Surge data under different conditions can be obtained through experiments, as shown in fig. 4, and is generally provided by a supplier during fan supply, but the data is relatively dispersed and cannot be applied to actual production guidance.
In order to effectively prevent surging and stabilize the stable operation of the system, various fan manufacturers develop various anti-surging control systems in recent years, but the anti-surging control systems are independent control systems, have high cost and large volume, are difficult to connect with a DCS distributed control system, and are not beneficial to large-scale popularization.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned defect that prior art exists, the utility model provides a fan anti-surge control system.
The blower anti-surge control system comprises a blower, and an inlet pipeline, an outlet pipeline and an emptying pipeline which are connected with the blower; an inlet pipeline is provided with an inlet valve, an outlet pipeline is provided with an outlet valve, and the outlet valve is connected with the outlet of the fan; the emptying pipeline is provided with an emptying valve and also comprises an anti-surge pipeline which is respectively connected with the inlet pipeline, the outlet pipeline and the emptying pipeline and forms a closed loop;
the anti-surge pipeline comprises a controller, an inlet flow display, an outlet pressure transmitter and an emptying flow regulator;
the inlet flow display is positioned on the inlet bypass pipe, the inlet bypass pipe is connected with the inlet pipeline, and two ends of the inlet flow display are respectively connected with the inlet bypass pipe and the controller and used for detecting the inlet flow of the inlet pipeline;
the outlet pressure transmitter is positioned in the outlet bypass pipe, the outlet bypass pipe is connected with the outlet pipeline, and two ends of the outlet pressure transmitter are respectively connected with the outlet bypass pipe and the controller and used for detecting the outlet pressure of the outlet pipeline;
the emptying flow regulator is positioned in the emptying bypass pipe, the emptying bypass pipe is connected with an emptying pipeline, and two ends of the emptying flow regulator are respectively connected with the emptying bypass pipe and the controller and used for detecting the emptying flow of the outlet pipeline;
the controller comprises a receiving unit and a control unit, the receiving unit receives input signals transmitted by the inlet flow display, the outlet pressure transmitter and the emptying flow regulator and transmits the input signals to the control unit, and when the control unit judges that surging occurs, the control unit controls the opening degree of the inlet valve and the opening degree of the emptying valve to perform anti-surge control.
Preferably, the inlet valve and the emptying valve are also provided with filter silencers.
Preferably, the angle between the flow direction of the medium in the inlet pipeline and the inlet of the anti-surge pipeline connected with the inlet pipeline is more than 90 degrees.
Preferably, the angle between the flow direction of the medium in the inlet and outlet pipelines connected with the anti-surge pipeline and the outlet pipeline is less than 90 degrees.
Preferably, the inlet valve, the outlet valve and the emptying valve are electrically controlled valves or hydraulically controlled valves.
Preferably, the inlet valve, the outlet valve and the emptying valve are freely adjusted within 0-90 degrees.
The utility model has the advantages that: the blower fan anti-surge control system (1) the technique does not need extra investment to adopt and buy the blower fan surge monitoring system; (2) the controller adopts a DCS distributed control system to realize automatic control; (3) the device is suitable for chemical enterprises to realize automatic control by transforming the original device, and has extremely low cost.
Drawings
Fig. 1 is a structural diagram of the control system of the present invention.
Fig. 2 is a schematic diagram of the control system of the present invention.
FIG. 3 is a graph of a prior art fan performance curve versus a pipeline characteristic.
FIG. 4 is a prior art fan surge limit line graph.
In the figure: 1. an inlet valve; 2. a fan; 3. an outlet valve; 4. an emptying valve; 5. a controller; 6. an inlet flow display; 7. an outlet pressure transmitter; 8. and (5) emptying the flow regulator.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1:
as shown in fig. 1 to 2, the blower anti-surge control system of the present invention includes a blower 2, and an inlet pipeline, an outlet pipeline and a vent pipeline connected to the blower 2; an inlet pipeline is provided with an inlet valve 1, an outlet pipeline is provided with an outlet valve 3, and the outlet valve 3 is connected with the outlet of the fan; the emptying valve 4 is arranged on the emptying pipeline, and the emptying pipeline also comprises an anti-surge pipeline which is respectively connected with the inlet pipeline, the outlet pipeline and the emptying pipeline and forms a closed loop;
the anti-surge pipeline comprises a controller 5, an inlet flow display 6, an outlet pressure transmitter 7 and an emptying flow regulator 8;
the inlet flow display 6 is positioned on the inlet bypass pipe, the inlet bypass pipe is connected with the inlet pipeline, and two ends of the inlet flow display 6 are respectively connected with the inlet bypass pipe and the controller 5 and used for detecting the inlet flow of the inlet pipeline;
the outlet pressure transmitter 7 is positioned on the outlet bypass pipe, the outlet bypass pipe is connected with the outlet pipeline, and two ends of the outlet pressure transmitter 7 are respectively connected with the outlet bypass pipe and the controller 5 and used for detecting the outlet pressure of the outlet pipeline;
the emptying flow regulator 8 is positioned in the emptying by-pass pipe, the emptying by-pass pipe is connected with an emptying pipeline, and two ends of the emptying flow regulator 8 are respectively connected with the emptying by-pass pipe and the controller 5 and used for detecting the emptying flow of the outlet pipeline;
the controller 5 comprises a receiving unit and a control unit, the receiving unit receives input signals transmitted by the inlet flow display 6, the outlet pressure transmitter 7 and the emptying flow regulator 8 and transmits the input signals to the control unit, and when the control unit judges that surging occurs, the control unit controls the opening degrees of the inlet valve 1 and the emptying valve 4 to perform anti-surge control.
And a filtering silencer is also arranged on the inlet valve 1 and the emptying valve 4.
The inlet of the anti-surge pipeline connected with the inlet pipeline forms an included angle larger than 90 degrees with the flowing direction of the medium in the inlet pipeline.
The flow direction of the medium in the inlet and outlet pipelines connected with the anti-surge pipeline and the outlet pipeline forms an included angle smaller than 90 degrees.
The inlet valve 1, the outlet valve 3 and the emptying valve 4 are all electric control valves or hydraulic control valves.
The inlet valve 1, the outlet valve 3 and the emptying valve 4 are all freely adjusted within 0-90 degrees.
Fan surge-proof control system, have following advantage:
(1) the technology does not need extra investment for adopting and buying a fan surge monitoring system;
(2) the controller 5 adopts a DCS distributed control system to realize automatic control;
(3) the device is suitable for chemical enterprises to realize automatic control by transforming the original device, and has extremely low cost.
Example 2:
in particular, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to specific data,
firstly, obtaining fan surge experimental data from a fan manufacturer:
then fitting laboratory data to obtain a fan surge limit flow calculation formula:
QZ＝0.4895x2+11.848x+95.313
integrating a fan surge warning flow calculation formula according to a fan surge limit flow calculation formula, wherein the formula is used as a basis for adjusting the running state of the fan 2:
QA＝Q0×1.15＝0.5629x2+13.625x+109.61
after the fan surge warning flow formula is obtained, the minimum flow of the fan 2 can be simply calculated according to the pressure of the fan outlet, and the inlet valve and the outlet valve of the fan 2 are adjusted to ensure that the flow of the fan 2 is higher than the surge flow, so that the stable operation of the fan 2 can be ensured.
Fan anti-surge control system's limit line flow calculation method, including following step:
s1, setting the pressure according to the outlet pressure of the fanSP(ii) a Fan outlet pressure set point PSPThe set value of the inlet flow is adjusted at any time according to the load change condition of the fan 2 through calculation, and the calculation part is arranged outside the closed loop, so that the controller parameter is set by a single-loop flow control system.
Wherein, PSP: a fan outlet pressure set value, Kpa;
s2: calculating the minimum flow of the fan 2 according to a fan surge early warning control formula of the controller 5 and monitoring the flow Q constantlyA；
Wherein, Q: fan outlet flow, m3/min；
QA: surging warning flow m of fan3/min；
P: fan outlet pressure, pa (g);
QO: surge limit flow m of fan3/min；
S2: the control method of the control unit includes the following cases:
s21: when the flow of the fan 2 is reduced, the outlet pressure of the fan is increased, and the method comprises the following small steps:
after detecting that the outlet pressure of the fan is increased, the controller 5 firstly detects whether the emptying valve 4 is in an open state;
s211: if the emptying valve 4 is in an open state, the controller 5 slowly closes the inlet valve 1, and the flow of the fan 2 and the outlet pressure are simultaneously and gradually reduced until the outlet pressure of the fan reaches a pressure set value PSP；
The controller 5 compares the flow Q of the fan 2 with the surge Q of the fan by real-time detection in the adjusting processAIf the flow Q of the fan 2 reaches QAWhen the fan 2 is close to the surge warning line, the controller 5 stops the closing action of the inlet valve 1 and keeps the original position, and the emptying valve is slowly opened until the outlet pressure of the fan reaches the pressure set value PSP；
S212: if the emptying valve 4 is in a closed state, the controller 5 slowly closes the inlet valve 1, and the flow of the fan 2 and the outlet pressure are simultaneously and gradually reduced until the outlet pressure of the fan reaches a pressure set value PSP；
S213: if the actual flow of the fan 2 is smaller than Q in the process of closing the inlet valve 1AWhen the fan 2 is close to the surge warning line, the controller 5 stops the closing action of the inlet valve 1 and keeps the original position, and the emptying valve is slowly opened until the outlet pressure of the fan reaches the pressure set value PSP；
S22: when the air demand of the pipeline system is increased, the outlet pressure of the fan is reduced, and the method comprises the following small steps:
the controller 5 firstly detects whether the emptying valve 4 is in an opening state;
s221: if the emptying valve 4 is in a closed state, the controller 5 slowly opens the inlet control valve of the fan 2 until the outlet pressure of the fan reaches a pressure set value PSP；
S222: if the vent valve 4 is in the open state, the controller 5 will slowly close the vent valve 4 until the fan outlet pressure reaches the pressure set value PSP；
S223: if the emptying valve 4 is closed, the fan is dischargedThe port pressure still cannot reach the pressure set point PSPThe controller 5 continues to open the inlet control valve of the fan 2 until the inlet valve 1 and the outlet pressure of the fan reach the pressure set valuePSP。
In step S2, the controller 5 collects the fan outlet pressure and the fan 2 flow rate on the spot, and controls the inlet valve 1 and the emptying valve 4 according to a predetermined control scheme, so as to ensure that the fan outlet pressure is stabilized at a set value.
In the step S2, a fan surge limit line formula is generated to generate a fan surge early warning control formula QK＝Q0×1.15。
In the step S2, the fan 2 fits to generate a fan surge limit line formula Q of the fan outlet flow and the fan pressureZ＝aP2+bP+c；
Wherein, a, b, c: coefficients in the formula.
It should be noted that:
(1) fitting of fan surge experiment data needs to ensure high coincidence, and a fitting coefficient R must be higher than 99.9%;
(2) accuracy of fan surge experimental data;
(3) the pressure setting of the fan outlet needs to be set periodically according to the requirement of air supply quantity.
Fan anti-surge control system's limit line flow calculation method, adopt fan surge limit flow computational formula, fan surge experimental data's fitting method, have following advantage: the minimum flow and the warning flow of the fan 2 can be rapidly obtained according to the pressure at the outlet of the fan, the running condition of the fan 2 can be monitored at any time in actual production, and the stable running of the fan 2 is realized.
The utility model discloses can extensively apply to fan surge control occasion.
Claims (6)
1. A fan anti-surge control system comprises a fan (2), and an inlet pipeline, an outlet pipeline and an emptying pipeline which are connected with the fan (2); an inlet pipeline is provided with an inlet valve (1), an outlet pipeline is provided with an outlet valve (3), and the outlet valve (3) is connected with the outlet of the fan; the emptying valve (4) is arranged on the emptying pipeline, and the anti-surge pipeline is characterized by also comprising an inlet pipeline, an outlet pipeline and the emptying pipeline which are respectively connected to form a closed loop;
the anti-surge pipeline comprises a controller (5), an inlet flow display (6), an outlet pressure transmitter (7) and an emptying flow regulator (8);
the inlet flow display (6) is positioned on the inlet bypass pipe, the inlet bypass pipe is connected with the inlet pipeline, and two ends of the inlet flow display (6) are respectively connected with the inlet bypass pipe and the controller (5) and used for detecting the inlet flow of the inlet pipeline;
the outlet pressure transmitter (7) is positioned on the outlet bypass pipe, the outlet bypass pipe is connected with the outlet pipeline, and two ends of the outlet pressure transmitter (7) are respectively connected with the outlet bypass pipe and the controller (5) and used for detecting the outlet pressure of the outlet pipeline;
the emptying flow regulator (8) is positioned in the emptying by-pass pipe, the emptying by-pass pipe is connected with an emptying pipeline, and two ends of the emptying flow regulator (8) are respectively connected with the emptying by-pass pipe and the controller (5) and are used for detecting the emptying flow of the outlet pipeline;
the controller (5) comprises a receiving unit and a control unit, the receiving unit receives input signals transmitted by the inlet flow display (6), the outlet pressure transmitter (7) and the emptying flow regulator (8) and transmits the input signals to the control unit, and when the control unit judges that surging occurs, the control unit controls the opening degree of the inlet valve (1) and the opening degree of the emptying valve (4) to perform anti-surge control.
2. The blower anti-surge control system according to claim 1, wherein a filter muffler is further installed on the inlet valve (1) and the blow-down valve (4).
3. The blower anti-surge control system of claim 1, wherein an inlet of the anti-surge pipeline connected to the inlet pipeline forms an angle of more than 90 ° with a flow direction of a medium in the inlet pipeline.
4. The blower anti-surge control system of claim 1, wherein an inlet of the anti-surge pipeline connected to the outlet pipeline forms an angle of less than 90 ° with a flow direction of the medium in the outlet pipeline.
5. The blower anti-surge control system according to claim 1, wherein the inlet valve (1), the outlet valve (3) and the blow-down valve (4) are electrically or hydraulically controlled valves.
6. The blower anti-surge control system according to claim 1, wherein the inlet valve (1), the outlet valve (3) and the blow-down valve (4) are freely adjustable between 0-90 degrees.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117108540A (en) * | 2023-10-12 | 2023-11-24 | 山东天瑞重工有限公司 | Anti-surge pressure-maintaining control method and system for magnetic suspension blower |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117108540A (en) * | 2023-10-12 | 2023-11-24 | 山东天瑞重工有限公司 | Anti-surge pressure-maintaining control method and system for magnetic suspension blower |
| CN117108540B (en) * | 2023-10-12 | 2023-12-19 | 山东天瑞重工有限公司 | Anti-surge pressure-maintaining control method and system for magnetic suspension blower |
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Address after: 255434 No. 22, middle refinery Road, Linzi District, Shandong, Zibo Patentee after: Shandong Sanwei Chemical Group Co.,Ltd. Address before: 255434 No. 22, middle refinery Road, Linzi District, Shandong, Zibo Patentee before: SHANDONG SUNWAY PETROCHEMICAL ENGINEERING Co.,Ltd. |