Chemical process intelligent pump and control method thereof

Abstract

The invention discloses a control method of a chemical process intelligent pump, which belongs to a pump control technology, a technological process device for realizing energy conservation of a chemical process pump in the prior art is complicated, and the control method comprises the following steps: writing startup rotational speed N0, writing a flow rate-power performance chart of energy conservation and setting target flow rate Q0 through an initialization module; leading the pump to be started up according to the startup rotational speed N0 and measuring actual power P when the pump operates at a certain rotational speed N1 by a power measuring module; using a control module to compare the measured actual power P with the flow rate-power performance chart to obtain actual flow rate Q when the pump operates at the rotational speed N1, and calculate through a formula that Q0 / Q equals N / N1 to obtain rotational speed N when the pump achieves the target flow rate Q0; and using an output module to output the rotational speed N when achieving the target flow rate Q0 to a motor for driving the pump. The control method does not need to increase any sensing device in the technological process device and can carry out self-parameter detection and operation control on the pump to achieve the desired operation parameters of the pump, thereby improving the energy efficiency and being conductive to transformation of the existing device.

Description

technical field [0001] The invention belongs to pump control technology, in particular to an energy-saving chemical process intelligent pump mainly used in petroleum and chemical process equipment. Background technique [0002] The pump is a big energy consumer. According to the data, the power consumption of the pump accounts for about 20% of the total power consumption in the country, and the power of the motor matching the pump accounts for about 45% of the total capacity of the motor in the country. In petroleum and chemical plants, the power consumption of pumps is even higher, reaching 59% and 26% respectively. In our country, in the past, the energy loss of the pump operation system was very large, and the adjustment of centrifugal pumps mostly adopted methods such as valve control and opening and closing bypass. According to a foreign survey data, among more than 1,600 pumps operating in 20 factories, the average energy efficiency is only about 40%, and the energy e...

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Problems solved by technology

[0006] The technical problem to be solved and the technical task proposed by the present invention are to overcome the defects of complex process equipment and changing the characteristics of the original process equipment caused by the combination of existing sensors and frequency converters to realize the energy saving of chemical process pumps, and to solve the problems of existing sensors and frequency converters. The defect of the control method (quantitative and constant pressure control) provides a chemical process intelligent pump and its control method

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