Flow regulation at constant head in feedwater pumps in a sugar industry

Abstract

In this paper the feasibility of energy saving by implementing flow regulation at constant load in feedwater pumps in a sugar industry is studied. As regulation strategy, the use of a variable speed drive in the hydraulic system is proposed. For the project evaluation, the Net Present Value and Payback Period techniques are used. Among the variables considered are the price of energy, the equipment useful life, financial data and those related to environmental impact. As a result, it was found that if only a commercial approach is considered, the energy saving strategy is profitable but not attractive, because investment is recovered in a period close to the useful life of technology. However, if a government focus that encourages the implementation of these energies saving strategies is considered, the investment of the project recovers in a short time.

Direct-on-line-start permanent-magnet-assisted synchronous reluctance motors with ferrite magnets for driving constant loads

“…As can been observed in table for a same output power, the input power is lower, so the efficiency of the PMa-SynRM is 5.9 percentage points higher than the IM, which is remarkable. It is also shown that the power factor is substantially higher than in the IM [2]. The cage of PMa-SynRM has the same effect as in a squirrel cage induction motor at start-up.…”

“…Among the total energy demand in the industries, motors consume nearly 70%. Due to the great energy consumption that electric motors have in the industry, not only in conditions of adequate parameters of energy quality, but also in the case where there are quality problems, every day there is more concern to increase the efficiency of motors [1][2][3][4]. At present, great attention is being given to the development of synchronous motors without windings in the rotor, replacing the induction motors (IM).…”

A new exact equivalent circuit of the medium voltage three-phase induction motor

“…The three-phase induction motor is the electromechanical converter of the electric drive of the great majority of mechanisms or mechanical loads and the principal electrical energy consumption of industrial installations [1,2]. This means that the knowledge of the mathematical models that allow the prediction of the behavior of these motors on the electric grid as well as on the mechanical system of which is its driver has great importance.…”

Personal computer/programmable logic controller based variable frequency drive training platform using WxPython and PyModbus

“…Puja and Syed [24] stated that VFD allows to control the induction motor with the reduction in power consumption. Gómez et al [25] studied the feasibility of energy saving by implementing flow regulation at constant load in feed water pumps in a sugar industry. Jasim et al [26] used four VFD units to control the speed of four submersible water pump and the light intensity of four lamps (each VFD controls one pump and one lamp) according to the voltage control signals derived from the IIR filter.…”