DEVICE AND METHOD FOR OPERATING PARALLEL CENTRIFUGAL PUMPS

摘要

A device and a method for operating multiple centrifugal pumps are disclosed. The device can include a communication interface for receiving as at least one input information, an instantaneous pressure drop and an instantaneous flow rate per pump or speed of the centrifugal pumps, and for transmitting output information to the centrifugal pumps, where the output information reflects a reference value for the number of centrifugal pumps to be operated in parallel. The device can contain a data storage unit and a processing unit, which determine from input information and additional information an instantaneous efficiency, a first expected efficiency under the assumption that the actual number is reduced by one, and a second expected efficiency under the assumption that the actual number is increased by one, and which can generate the reference value depending on which of the instantaneous or first expected or second expected efficiencies has a highest value.

主权项

1. A device for operating multiple centrifugal pumps, wherein the centrifugal pumps are of a same type and size and are to be operated at a same speed, the device comprising:
a communication interface (I/O) for receiving at least one input information on a state of operation of centrifugal pumps and for transmitting at least one output information to at least one driving unit of the centrifugal pumps, where the at least one output information reflects a reference value for a number of centrifugal pumps to be operated in parallel, the communication interface (I/O) being arranged to receive as input information, an instantaneous pressure drop (H_i) across and an instantaneous flow rate per pump (Q_i) or speed (n_i) of the centrifugal pumps which are to be currently operated in parallel; a data storage unit (MEM) for storing at least one additional information, as an actual number (m_a) of currently operated centrifugal pumps and a rated speed (n_r) of the centrifugal pumps; and a processing unit (PU) for generating the at least one output information from the at least one input information and the additional information, the processing unit (PU) being configured to determine from the input information and the additional information an instantaneous efficiency (E_i), a first expected efficiency (E_e1) under an assumption that an actual number (m_a) is reduced by one, and a second expected efficiency (E_e2) under an assumption that the actual number (m_a) is increased by one, and to generate a reference value (m) depending on which of the instantaneous (E_i) or the first expected or second expected efficiencies (E_e1, E_e2) has a highest value.