Pump Efficiency Calculation Method Based on Flow Soft Measurement of Independent Low Addition Drainage Pump

Abstract

A pump efficiency measurement method based on soft flow measurement of independent low-add-drain pumps. The thermal system of the present invention is composed of an independent low-pressure heater (referred to as low-pressure heater) and a drain pump. From the database of the plant-level monitoring information system SIS or the distributed control system DCS of the thermal power plant, obtain the outlet water pressure with the drain pump heater, obtain the temperature of the inlet water of the drain pump, and obtain the real-time current, real-time voltage, and motor efficiency of the drain pump configuration motor. With the power factor, the inlet water pressure of the drainage pump and the average drainage specific volume are calculated, and the pressure difference of the drainage pump is calculated as the difference between the outlet water pressure of the heater with the drainage pump and the inlet water pressure of the drainage pump, and the independent thermal power unit based on energy balance is applied. The low-load drain pump flow measurement method calculates the drain pump flow rate, and calculates the drain pump output power and input power according to the above data. The ratio of output power to input power is calculated as the drain pump efficiency.

Description

technical field [0001] The invention relates to a method for measuring and calculating pump efficiency based on the soft measurement of the flow rate of an independent low-pressure drain pump, and belongs 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 ...

AI Technical Summary

Problems solved by technology

When calculating the input power of the drain pump, it is impossible to extract the instantaneous power value, which affects the calculation of the efficiency of the drain pump. When calculating the output power of the drain pump, it is necessary to calculate the flow of the drain pump. At present, adding a drain pump measurement point in the thermal system, It is necessary to select a suitable flowmeter according to its performance requirements, fluid characteristics, installation requirements, environmental conditions and cost factors, etc.

After adding this measuring point, there will be a certain impact on the flow rate, and it will take manpower and material resources to maintain it

Therefore, it is time-consuming and labor-intensive to directly solve the problem of the drainage pump flow from the hardware aspect, and there are many inconveniences

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

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