Engineering Selection for a Variable Speed Drive; Steam Turbine Drive or Electric Motor with VFD

Hopper, W.S.

doi:10.1109/papcon.2006.1673772

Cited by 5 publications

(3 citation statements)

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“…He remarked that turbine driven systems are advantageous over electric motor driven systems. 38 Toghraie et al studied numerically the effect of geometrical properties on a solar chimney performance. They discussed the numerical model of continuity, momentum, and energy equations.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of the energy and economic gain that can be achieved by driving the boiler feedwater pump with a backpressure steam turbine

Selimli

Sunay²

2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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The low-pressure steam requirement in the iron and steel production plant is obtained through pressure reduction stations with unrestrained expansion. In this study, the feasibility of obtaining the low-pressure steam that is needed in the plant in a backpressure turbine instead of pressure reduction stations has been studied. In this way, it is foreseen that a significant amount of wasted energy during the unrestrained expansion in pressure reduction stations, can be recovered as shaft work during the expansion process performed in the turbine. The obtained shaft work is planned to be used in the boiler feedwater pump drive. It is aimed to increase the efficiency of the system by the deactivation of boiler feedwater pump electric motors and as well as bringing the energy that is lost during the unrestrained expansion of the superheated steam to the system through the pump drive. The estimated size of energy saving of the system could be reached to 33.74%. The annual size of achievable saving has been determined by approximately 8,094,810 kWh and economically $509,973. The payback period of the estimated $683,079 investment is 1.34 years. A determined amount of saving is also equivalent to the reduction of 7,285,329 kg CO2 emission, annually.

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Section: Introductionmentioning

confidence: 99%

Feasibility study of the energy and economic gain that can be achieved by driving the boiler feedwater pump with a backpressure steam turbine

Selimli

Sunay²

2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…These pumps include the fresh water cooling pump, M/E jacket cooling fresh water pump, lubrication oil pump and auxiliary boiler feed water pump. Various methods have been proposed for controlling open pumps by means of variable frequency drives (VFDs) [1,2,4,8]; those proposed for closed pumps [9][10][11][12][13][14][15][16] have mainly focused on onshore power applications, with sparse literature regarding problems for closed pumps driven by VFDs in marine vessels or offshore power systems. From a practical system operation point of view, the closed pumps can be controlled by means of VFD constant pressure controls, such as boiler feed water control, air compressor pressure control, constant temperature control, such as fresh and sea water cooling water controls, or conditional controls, such as central cooling water control or jacket water cooling water control.…”

Section: Introductionmentioning

confidence: 99%

Variable flow controls of closed system pumps for energy savings in maritime power systems

Liao

Chou

et al. 2016

2016 IEEE Industry Applications Society Annual Meeting

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Pumps are extensively used in maritime industries as marine vessels utilize a wide range of pumps and pumping techniques to transfer and distribute all types of air and fluids. The electrical energy consumed by the various motors accounts for about 70% of a vessel's total power consumption, and this presents a problem in unique marine environments. Such situations are especially conducive to energy-saving strategies using variable frequency drives (VFDs) in centrifugal load service. This paper presents the design and results of applying variable frequency constant pressure technology in closed system pumps on marine vessels. The existing problem of traditional control methods for closed system pumps is analyzed and a mathematical model for variable flow controls with the appropriate control settings is derived. The performance of the proposed method is demonstrated and verified through experimental and field tests of a practical auxiliary boiler feed water management system on a commercial vessel. It is proved that the proposed method can maintain constant water pressure for closed system pumps and provide an efficient way to measure energy savings and maintenance benefits. The results serve to highlight the significant energy-saving opportunities for retrofitted and new VFD installations in marine power applications. Index Terms: Closed system pump, Constant pressure, Energy efficiency, Maritime power system, Variable flow control BIOGRAPHIES Chun-Lien Su (S'97-M'01-SM'13) received the Diploma of Electrical

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“…IF the generator turbine had (enough) additional capacity and IF the generator itself had (enough) surplus capacity to produce electricity and IF an AFD/motor combination to drive the ID fan would require less electrical energy than the incremental generation, the mill had the basis for a viable project. Simplified to most basic form, the key issue was whether the larger generator turbine was enough more efficient than the smaller ID fan turbine that it could use the same steam flow to produce enough power for an electric fan drive and have enough left over to sell or offset purchases in order to produce the positive return on the investment required [1]. IV.…”

Section: Introductionmentioning

confidence: 99%

ID fan drive efficiency upgrade: MV AFD to replace mechanical drive steam turbine

Hopper

2010

Conference Record of 2010 Annual Pulp &Amp; Paper Industry Technical Conference

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Engineering Selection for a Variable Speed Drive; Steam Turbine Drive or Electric Motor with VFD

Cited by 5 publications

References 0 publications

Feasibility study of the energy and economic gain that can be achieved by driving the boiler feedwater pump with a backpressure steam turbine

Feasibility study of the energy and economic gain that can be achieved by driving the boiler feedwater pump with a backpressure steam turbine

Variable flow controls of closed system pumps for energy savings in maritime power systems

ID fan drive efficiency upgrade: MV AFD to replace mechanical drive steam turbine

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