Method for measuring and calculating pump efficiency based on soft flow measurement for drainage pump

A technology of drainage pump and soft measurement, applied in the field of soft measurement, can solve the problems affecting the output power measurement of drainage pump and so on

Inactive Publication Date: 2011-09-14
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

These problems in the flow measurement of the drain pump directly affect the measurement of the output power of the drain pump

Method used

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  • Method for measuring and calculating pump efficiency based on soft flow measurement for drainage pump
  • Method for measuring and calculating pump efficiency based on soft flow measurement for drainage pump
  • Method for measuring and calculating pump efficiency based on soft flow measurement for drainage pump

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Embodiment Construction

[0045] A pump efficiency calculation method based on the soft measurement of the flow rate of the drain pump, which is composed of the first to n stages of low-pressure heaters connected in series, n=2 to 4, wherein the drain of the first-stage low-pressure heater is connected to the drain of the first The feed water at the outlet of the low-pressure heater of the first stage is mixed, and the water of the other low-pressure heaters of the other stages is self-flowing step by step. The algorithm steps are as follows:

[0046] Step 1: From the database of the plant-level supervisory information system SIS or the distributed control system DCS of the thermal power plant,

[0047] Obtain the water pressure p at the outlet of the low-pressure heater with the drain pump w ;Get the inlet water temperature t of the drain pump p , calculate the inlet water pressure p of the drain pump p and hydrophobic average specific volume Calculate the pressure difference Δp of the drain pump ...

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Abstract

The invention discloses a method for measuring and calculating pump efficiency based on soft flow measurement for a drainage pump. A thermodynamic system consists of a low-pressure heater (low heater for short) and the drainage pump which are connected in series. The method comprises the following steps: acquiring water pressure of an outlet of the low heater with the drainage pump, acquiring thetemperature of inlet water of the drainage pump and acquiring real-time current and real-time voltage of a motor collocated in the drainage pump, motor efficiency and power factor from a database of a factory-level SIS or a DCS of a heat-engine plant, acquiring inlet water pressure and average drainage specific volume of the drainage pump through calculation, calculating the pressure difference of the drainage pump, namely the difference between the outlet water pressure of the heater with the drainage pump and the inlet water pressure of the drainage pump, calculating the flow of the drainage pump by using a method for measuring and calculating the flow of the drainage pump in a low heating system of a thermal power unit based on energy balance, and calculating the output power and the input power of the drainage pump according to the data. The ratio of the calculated output power to the input power is the efficiency of the drainage pump.

Description

technical field [0001] The invention relates to a method for measuring and calculating pump efficiency based on soft measurement of flow rate of a hydrophobic pump, belonging to the field of soft measurement. Background technique [0002] With the expansion of the capacity of thermal power units, the influence of the heat recovery system on the units has attracted more and more attention. In regenerative heaters, in order to improve the regenerative effect of surface heaters, low pressure heaters are usually equipped with a drain pump. The measurement of the efficiency of the drain pump has an important impact on the performance monitoring of the drain pump, the optimal operation of the drain pump, the analysis of the operating status of the heater group, and even the heat balance calculation of the heat recovery system. Therefore, it is necessary to monitor the efficiency of the drain pump. At present, there are no reports on the calculation of the efficiency of the drain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B51/00
Inventor 王培红刘莎钱瑾苏志刚彭献永
Owner SOUTHEAST UNIV
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