Improving eco-eficiency by auditing and steam condensate systems
Petek, Janez ; Glavič, Peter
Several assessments of steam and condensate systems have been carried out (in textile plants, animal food processing plant, slaughterhouse waste processing plant, etc.) The methodology of the ...assessment includes flowsheet, mass and energy balances of the process and boiler house, the identification of all steam consumers, the flowsheet of steam and condensate systems, the study of pressure and temperature levels, the determination of the database for pressure reducing valves and steam traps, the introduction of rational steam consumption and effective steam production options, and making technical, economic and environmental assessments. Only the most beneficial options should be proposed and implemented. The analyses show that several options can improve the eco-efficiency of a plant. The efficiency of boilers can be improved by heat recovery from blowdown, from flue gas and deaerating gasses, control of the combustion process, etc. The steam should be efficiently consumed , all steam traps should be correctly selected and installed in the process. The staff should regularly check the operating of steam and condensate armatures, seek for leaks, etc. The results show that it is possible to reduce the productionof flue gas emissions by more than 10%, wastewater by 5%, fuel by 8%and wste heat up to 20%. Payback periods of the proposed options reach up to1.1 years.
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