Status of Industrial Waste Heat and Heat Trading Practice among District Heating Companies in Korea

摘要

Waste heat from industrial sectors of Korea is statistically investigated to assess the potential of energy recovery. The quantities of unused heat ejected by factories are collected through a national wide survey with the aid of a government organization. The data a processed to delineate key statistical features. We found that chemical plants are responsible for more than half of the waste heat generation. Metal processing produces the second largest portion (about 30%). A great majority (83%) of the waste heat is ejected in the form of flue or exhaust gas. The temperature range of the waste heat is analyzed to assess the potential for applicable technologies. We also surveyed the amount of steam trading among neighboring factories and found that that there are virtually no relations between the steam price and quality (or state). The implication is that steam trading occurs mostly through arbitrary contract without meticulous technological or economic considerations. The current steam trading practice leaves ample potentials for improvement and gives hints to policy makers on the future direction of energy policy. The states (pressure and temperature) of the traded steam are sorted to estimate the exergy destructions associated with the accompanying throttling processes that are required to adjust the pressures of the supplier and receiver sides. A thermodynamic analysis on useful energy destruction during the trading processes is included to provide quantitative technological information.