Description:Complete Specification

The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.
Field of the invention
[0001] This invention relates to a method to identify brush type electric feed pump degradation, and more specifically to the method to identify brush type electric feed pump degradation with integrated electric pump control.

Background of the invention
[0002] CN 110766172 A describes an intelligent monitoring method for the running state of a power plant steam feed pump. According to the method, a main failure form of the steam feed pump is provided, vibration sensors are installed on bearing seats of a small steam turbine and the steam feed pump, vibration data of the small steam turbine and the steam feed pump are collected, and fault characteristic parameters of the small steam turbine and the steam feed pump are obtained through signal reconstruction. A power plant equipment management system is used for collecting a feed pump rotating speed given value, a rotating speed feedback value, outlet pressure, the shaking degree of a booster stage impeller wear ring and gourd-off data of a thrust disc working face, fault coefficients of all failure forms are set and calculated, and fault prediction is given according to the fault coefficients. According to the method, intelligent monitoring of the operation state of the steam feed pump is achieved through classification indexes, the degradation trend of the operation state of the steam feed pump is mastered, various defects of the steam feed pump are found in time, normal operation and safety of equipment are guaranteed, and maintenance is guided.

Brief description of the accompanying drawing
[0003] Figure 1 illustrates an algorithm to identify brush type electric feed pump degradation with integrated electric feed pump control in one embodiment of the invention.

Detailed description of the embodiments
[0004] Figure 1 illustrates a method 100 to identify brush type electric feed pump degradation with integrated electric feed pump control. The method 100 comprises supplying 110 the brush type electric feed pump with a constant voltage power supply, determining 120 a corresponding first pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in a new condition, and determining 130 a corresponding second pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in an old condition. The method 100 further comprises determining 140 a deviation in the second pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in an old condition and the first pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in the new condition, and inferring 150 that the brush type electric feed pump has degraded if the deviation in the second pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in the old condition is lesser than the first pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in the new condition by a pre-determined threshold value.

[0005] Figure 1 illustrates a method 100 to identify brush type electric feed pump degradation with integrated electric feed pump control. The method 100 comprises supplying 110 the brush type electric feed pump with a constant voltage power supply. Therein, the method comprises determining 120 a corresponding first pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in a new condition. Therefore, since the corresponding first pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump is determined for the brush type electric feed pump that is in the new condition, the second pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump is determined 130 for the brush type electric feed pump that is in an old condition.

[0006] In an exemplary embodiment, the method 100 further comprises determining 140 a deviation in the second pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in an old condition and the first pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in the new condition. The determined deviation between the second pump speed that is in the old condition and the first pump speed that is in the new condition is then compared with a pre-determined threshold value. If the second pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in the old condition is lesser than the first pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in the new condition by a pre-determined threshold value, it is therein inferred 150 that the brush type electric feed pump has degraded.

[0007] In an exemplary embodiment, the method 100 to identify brush type electric feed pump degradation with integrated electric feed pump control further comprises determining 160 a first outlet flow rate of fuel from the brush type electric feed pump based on the first pump speed. Thereafter, the method 100 further comprises determining 170 a second outlet flow rate of fuel from the brush type electric feed pump based on the second pump speed. Once the first outlet flow rate of fuel and the second outlet flow rate of fuel is determined, the method 100 comprises determining 180 a deviation of the second outlet flow rate of fuel from the brush type electric feed pump from the first outlet flow rate of fuel from the brush type electric feed pump. If the deviation of the second outlet flow rate of fuel from the brush type electric feed pump is lesser than the first outlet flow rate of fuel from the brush type electric feed pump by a user defined threshold flow rate, it is thereby inferred 190 that the brush type electric feed pump has degraded.

[0008] The first outlet flow rate of fuel from the brush type electric feed pump based on the first pump speed and the second outlet flow rate of fuel from the brush type electric feed pump based on the second pump speed can be used to plot predictive charts on the behavior of the brush type electric feed pump at different operating points of the brush type electric feed pump. Thereby, the degradation of the brush type electric feed pump at different operating points of the brush type electric feed pump can be predicted more effectively.

[0009] It must be understood that the embodiments explained above are only illustrative and do not limit the scope of the disclosure. Many modifications in the embodiments with regard to dimensions of various components are envisaged and form a part of this invention. The scope of the invention is only limited by the scope of the claims.
, Claims:We Claim

1. A method (100) to identify brush type electric feed pump degradation with integrated electric feed pump control, the method (100) comprising:
supplying (110) the brush type electric feed pump with a constant voltage power supply;
determining (120) a corresponding first pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in a new condition;
determining (130) a corresponding second pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in an old condition;
determining (140) a deviation in the second pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in an old condition and the first pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in the new condition; and
inferring (150) that the brush type electric feed pump has degraded if the deviation in the second pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in the old condition is lesser than the first pump speed based on the constant voltage power supply that is supplied to the brush type electric feed pump for the brush type electric feed pump that is in the new condition by a pre-determined threshold value.

2. A method (100) to identify brush type electric feed pump degradation with integrated electric feed pump control in accordance with Claim 1, further comprising:
determining (160) a first outlet flow rate of fuel from the brush type electric feed pump based on the first pump speed;
determining (170) a second outlet flow rate of fuel from the brush type electric feed pump based on the second pump speed; and
determining (180) a deviation of the second outlet flow rate of fuel from the brush type electric feed pump from the first outlet flow rate of fuel from the brush type electric feed pump.

3. A method (100) to identify brush type electric feed pump degradation with integrated electric feed pump control in accordance with Claim 2, wherein the brush type electric feed pump is inferred (190) to be degraded if the deviation of the second outlet flow rate of fuel from the brush type electric feed pump from the first outlet flow rate of fuel from the brush type electric feed pump is below a user defined threshold flow rate.