Steam optimization and cogeneration system and method
First Claim
1. In a cogeneration system including at least a first and a second turbogenerator unit, each supplied through throttle valve means with steam at a higher throttle pressure, for generating steam through extraction valve means at a lower extraction pressure and for exhausting steam to an associated condenser at a still lower exhaust pressure and under condenser constraints, while generating electrical power at an operating speed of the associated turbogenerator unit, said generated steam and electrical power being supplied to a plant together with electrical power derived from a tie-line, each of said turbogenerator units having a throttle flow input and a condenser flow output, at least one of said turbogenerator units having an extraction flow output, while generating output electrical power;
- the combination of;
first means responsive to a present steam demand of the plant for determining under said condenser constraints an optimal steam flow output distribution between said exhaustion flow and condenser flow outputs from said turbogenerator units;
second means responsive to said optimal steam output distribution and to said plant power demand for providing a throttle flow input distribution for said turbogenerator units; and
control means responsive to said first and second means and operative on said extraction valve means and said throttle valve means for establishing said optimal steam flow output and throttle steam flow input distributions;
whereby said steam and power demands of the plant are optimally satisfied.
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Accused Products
Abstract
In a multiturbogenerator cogeneration system mass flow balancing is used to optimize the distribution of steam between the machine while meeting the demand in steam and electrical power of the industrial plant in order to choose the less costly between cogenerated power and power purchased from the tie-line. The EVOP method of optimization is used off-line with the assist of a microcomputer to determine the optimal distribution of steam.
36 Citations
3 Claims
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1. In a cogeneration system including at least a first and a second turbogenerator unit, each supplied through throttle valve means with steam at a higher throttle pressure, for generating steam through extraction valve means at a lower extraction pressure and for exhausting steam to an associated condenser at a still lower exhaust pressure and under condenser constraints, while generating electrical power at an operating speed of the associated turbogenerator unit, said generated steam and electrical power being supplied to a plant together with electrical power derived from a tie-line, each of said turbogenerator units having a throttle flow input and a condenser flow output, at least one of said turbogenerator units having an extraction flow output, while generating output electrical power;
- the combination of;
first means responsive to a present steam demand of the plant for determining under said condenser constraints an optimal steam flow output distribution between said exhaustion flow and condenser flow outputs from said turbogenerator units; second means responsive to said optimal steam output distribution and to said plant power demand for providing a throttle flow input distribution for said turbogenerator units; and control means responsive to said first and second means and operative on said extraction valve means and said throttle valve means for establishing said optimal steam flow output and throttle steam flow input distributions; whereby said steam and power demands of the plant are optimally satisfied. - View Dependent Claims (2, 3)
- the combination of;
Specification