Regeneracija odpadne toplote iz papirnega stroja

Delo obravnava regeneracijo odpadne toplote sušilnega zraka, ki se odvaja iz papirnega stroja pri sušenju papirja. Predstavljena je osnovna zasnova in delovanje papirnega stroja z njegovimi sestavnimi deli. V uvodnem delu so predstavljeni tudi prenosniki toplote, ter osnovna teorija njihovega preračunavanja. Podrobneje je obravnavana teorija cevnih prenosnikov toplote s križnim tokom, ker se tovrstni prenosniki uporabljajo v papirnicah za regeneracijo toplote. Izveden je matematični model preračuna cevnega prenosnika toplote s križnim tokom. V nadaljevanju je s tem modelom izveden izračun prenosnika za realni papirni stroj. Določene so dimenzije prenosnika, temperature na vstopu in izstopu, ter učinkovitost prenosnika. V zaključnem delu je izvedena primerjava rezultatov izračunanih z namenskim licenčnim programskim paketom. This assignment examines the regeneration of waste heat from drying air which is discharged from paper machine during the process of paper drying. It also includes an explanation of the basic layout and operation of the paper machine and its components. In addition to the latter, the introduction includes the presentation of the heat exchangers and the general theory of their calculations. A theory of tubular heat exchangers with cross flow is additionally closely examined, that is because those exchangers are used in paper mills for heat regeneration. A mathematical calculation model of tubular heat exchangers with cross flow is performed. With the use of previously mentioned model, calculations for exchanger in the real paper mill were made. Certain specifications were given, such as exchanger’s dimensions, temperatures at the input and the output, and exchanger’s efficiency. In the concluding part of this assignment, a comparison of calculated results is presented with dedicated licensed software packages.