Objective
The main objective is to reduce the energy acquisition cost of a synthetic fiber plant, and demonstrate that an economic energy saving of about 7. 800 TOE/year, can be achieved by installing a new 9'34 MW. cogenerative turbogas unit, plus a waste heat boiler with production 21'9 Tns/h of steam and 18 Kgs/h of hot water.
The existing cooling compressors will be substituted in a high percentage by absorption units.
Innovative aspects : The integrated use of so many components within an energetic system is claimed as innovative.
Energy saving represents 8% reduction of the production cost.
7.939 hours running the turbine, and 7.180 the boiler, with good performance in 1991. Total real saving 420 Millions pts. in 91 and 4.643 TOE.
Previously the plant purchased all the electricity about 91 GWH/a from the public utility. The steam generation is based on natural gas fired low pressure boilers. The process requires a considerable amount of cooling. The cooling energy, 12,8 Tcal/a (53,5 TO/a, is generated by mechanical compressors which increase the power demand of the plant by more than 20 percent in summer time. The proposed cogeneration plant would employ a gas turbine waste heat boiler unit. Additionally the existing cooling compressors would be replaced by absorption coolers to utilize the low temperature heat of the gas turbine exhaust gases. The introduction of absorption cooling will make possible to increase self-sufficiency of the plant in electrical energy from 50 % close to 80 %.
The cogeneration plant would comprise the following main components :
. Gas turbine 9,34 Mw
. Waste heat boiler : 21,9 t/h plus hot water
. Absorption coolers : 5,7 Gcal/h
The waste heat boiler will have two pressure levels 18-10 bars plus a hot water recovery cycle and one post combustion burner to attend the peak of steam demand as far as 31'8 t/h. The absorption coolers are three : one with 1,2 Gcal/h working during all year and feeding with hot water, and two with 2,25 Gcal/h for summertime with low pressure steam. The cooling systems will be integrated to fully utilize the new coolers.
The new electricity demand for the public system will be reduced to 14,2 Gwh/y.
The plant operates continuously i. e. 365 days a year 24 hours a day. The reliability of the power supply is an essential matter for the process industry of this type. The new cogeneration plant is envisaged to improve the situation in this respect.
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Programme(s)
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Coordinator
08028 Barcelona
Spain
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