A Method for Calculating the Efficiency of a Steam-driven Feedwater Pump When the Middle Tap of the Feedwater Pump Is Opened

A steam-driven feedwater pump and intermediate tap technology, which is applied in pump control, non-variable pumps, machines/engines, etc., can solve problems such as the method of calculating the efficiency of the pump is not clearly given, and achieve convenient measurement and measurement parameters. little effect

Active Publication Date: 2016-08-24
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing literature, there is no clear method to calculate the efficiency of the pump when the middle tap of the feed water pump is opened

Method used

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  • A Method for Calculating the Efficiency of a Steam-driven Feedwater Pump When the Middle Tap of the Feedwater Pump Is Opened
  • A Method for Calculating the Efficiency of a Steam-driven Feedwater Pump When the Middle Tap of the Feedwater Pump Is Opened
  • A Method for Calculating the Efficiency of a Steam-driven Feedwater Pump When the Middle Tap of the Feedwater Pump Is Opened

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Embodiment Construction

[0037] The specific embodiments of the present invention will be described in further detail below in conjunction with the drawings and embodiments.

[0038] figure 1 It is a schematic diagram of the system structure for determining the efficiency of the steam-driven feed water pump according to the present invention. In the figure, the parameters to be measured are calibrated. T represents temperature, P represents pressure, and G represents flow. In order to calculate the efficiency of the steam-driven feedwater pump, it is necessary to measure the fluid pressure and temperature at the inlet and outlet of the feedwater pump, the pressure and temperature of the feedwater pump, the outlet flow of the feedwater pump, and the dewatering flow. The position of each measuring point is as figure 1 As shown in the TP.

[0039] The method for calculating the efficiency of the steam-driven feedwater pump when the middle tap of the feedwater pump is opened includes the following steps:

[0...

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Abstract

The invention discloses a method for steam feed pump efficiency calculation when a feed pump center tap is opened. The method for the steam feed pump efficiency calculation when the feed pump center tap is opened comprises the steps that the enthalpy values of inlet and outlet fluid and reheat desuperheating water, feed pump inlet entropy, isentropy enthalpy under the pump outlet pressure and isentropy enthalpy under the reheat desuperheating water pressure are worked out respectively; the mass flow rate of feedwater and mass flow rate of the reheat desuperheating water are worked out; the energy absorbed by the flow volume of the reheat desuperheating water and the flow volume of the feed pump outlet under isentropy enthalpy flow under isentropy enthalpy flow and the energy of the feed pump in real flow are worked out; the lost energy is worked out; according to the energy absorbed by the flow volume of the reheat desuperheating water and the energy of the feed pump in real flow and the energy lost calculated by step 3 and step 4, the energy of the feed pump in real flowing and the lost energy, the efficiency of the feed pump when the feed pump center tap is opened is worked out. The method for the steam feed pump efficiency calculation when the feed pump center tap is opened has the advantages that measurement is convenient, a few measuring parameters are needed, and influence on a result by measuring errors is small.

Description

Technical field [0001] The invention relates to the field of steam-driven feedwater pumps, in particular to a method for calculating the efficiency of the steam-driven feedwater pump when the middle tap of the feedwater pump is opened. Background technique [0002] At present, most of the feed pumps of units of 300MW and above in our country are driven by small steam turbines. This is because compared with traditional electric feed water pumps, small steam turbine drives have obvious advantages in terms of saving power and economy. As the unit capacity increases, the power consumption of the feedwater pump accounts for about 2%-4% of the main engine power. Therefore, measuring the efficiency of the steam-driven feedwater pump is of great significance for guiding the safe and economic operation of the power plant. The traditional methods to measure the efficiency of steam-driven feedwater pumps are hydraulics and thermodynamics. However, no matter which method is used for testing,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D15/00
CPCF04D15/00
Inventor 祝令凯张彦鹏董广彦
Owner STATE GRID CORP OF CHINA
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