| Summary: | The purpose of this degree-project was to investigate the possibilities for primary air preheating into the two smallest waste incineration boilers of Halmstad Energy and Environment. The investigation is a pre-study which has the primary goal to evaluate technical and financial offers from companies that manufacture primary air preheater, and investigate if it is technically and financially profitable to do a purchase on primary air preheaters in the future. In the pre-study it is proposed that it is most efficient to have individual primary air preheater, one for each incineration boiler and the primary air are also proposed to be preheated by hot water in the pre-study. Further in the pre-study it is proposed that the heat-exchanger should have plain tubes instead of finned tubes, to avoid getting dirty fast. The space in the boiler-room is limited, and therefore the major problem was to fit in the primary air preheaters into the boiler-room. By comparing the different offers from the companies, the result in the pre-study shows that the offer from the company C.A. – MÖRCK has the most optimal primary air preheater. The results in the pre-study shows that it is technically possible to install primary air preheaters into the building, but the limited space in the boiler-room forced the distance between the tube-bundles in the primary air preheaters to be very small. Pressure-measurements on the primary air fans show that it is possible to use the existing fans with the purposed primary air preheaters. This assumes that the air-damper is always in the normal operation position. If it is financially profitable to install primary air preheaters is difficult to answer because it is difficult to predict the lifetime on the boilers and what economical profits the primary air preheaters may cause.
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