서지주요정보
습증기를 포함한 연소가스의 폐열 회수를 위한 열교환기 성능 예측 = Performance prediction of heat exchanger for waste heat recovery from humid flue gases
서명 / 저자 습증기를 포함한 연소가스의 폐열 회수를 위한 열교환기 성능 예측 = Performance prediction of heat exchanger for waste heat recovery from humid flue gases / 정동운.
발행사항 [대전 : 한국과학기술원, 2000].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8010827

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 00002

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

리뷰정보

초록정보

In boiler combustors and incinerators, the heat exchangers have been being used to recover the waste heat from the flue gases. The flue gases basically consist of the noncondensable gases with a certain amount of the water vapor. While the gas flows across the horizontal tube bank cooled by the cooling water, the heat transfer is enhanced by the vapor condensation. To predict the heat exchanger performance accurately, the effect of the noncondensable gases on the condensation over a horizontal tube should be known. However there are few review works reported on the condensation heat transfer with high concentration of the noncondensables. Therefore, in the present study, reviewed were the correlations for the condensation heat transfer, but with high concentration of the noncondensables. Then the best-estimate correlation was selected. To validate the correlation, it was tested by estimating the heat-recovery rate with a pilot-scale system. Three correlations for the flat plates and six correlations for the horizontal tubes were considered. For the flat plate condensation, among these three correlations, Asano’s correlation best represents the experimental results in the most range of the noncondensable-gas concentration. For the horizontal tube condensation, most of the correlations cover the mass-fraction range of the noncondensable gas below 0.3. Among them, Fujii’s correlation well represents the experimental results over the wide range of the mass-fraction of noncondensables, even down below 0.3 and up above 0.85, and is tentatively recommended as the best-estimate correlation for the condensation of the vapor/gas mixture outside the horizontal tubes. A simulation program using the Fujii’s correlation was constructed to analyze 1-D simplified condensing flow across the tube bank. Higher efficiency was anticipated by reducing the flue gas temperature down below the dew point where the water vapor in the flue gas is condensed at the surface of the heat exchanger; that is, the heat transfer by the latent heat is added to that by the sensible heat. This implies that there is an optimum operating condition to maximize the heat recovery from the flue gas. The temperature rises of the flue gas and the cooling water between the inlet and the outlet of the tube bank were compared with the experimental data reported previously. The predicted results agree well with the experimental data. Using this program, the parametric studies have been conducted by changing the operating conditions, such as the velocities and temperatures of the vapor/gas mixture and the cooling water, the number of the rows, and the conductivity of the wall material.

서지기타정보

서지기타정보
청구기호 {MME 00002
형태사항 xi, 75 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Dong-Woon Jeong
지도교수의 한글표기 : 이상용
지도교수의 영문표기 : Sang-Yong Lee
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 73-75
주제 폐열 회수
연소가스
응축
비응축성 기체
열/물질전달 관계식
Waste heat recovery
Flue gas
Condensation
Noncondensable gas
Heat/mass transfer correlation
QR CODE qr code