서지주요정보
Pilot-scale 반응기에서 요소용액을 이용한 질소산화물 제거 연구 = NOx removal by using urea solutions in a pilot-scale reactor
서명 / 저자 Pilot-scale 반응기에서 요소용액을 이용한 질소산화물 제거 연구 = NOx removal by using urea solutions in a pilot-scale reactor / 임영일.
저자명 임영일 ; Lim, Young-Il
발행사항 [대전 : 한국과학기술원, 1996].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8007007

소장위치/청구기호

학술문화관(문화관) 보존서고

MCHE 96031

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The effect of reaction temperature, Normalized Stoichiometric Ratio (NSR; 0.5*[urea]/[NO]), gas additives (CO, $C_3H_8$), liquid additives ($CH_3OH$, $C_2H_5OH$, PEO), and the presence of $SO_2$ gas on the reduction of NOx with urea solution have been determined in a pilot scale combustor. The maximum conversions of NOx reduction by urea and ammonia exhibit at 970℃ and 950℃, respectively. Conversion of NOx reduction increases with increasing NSR up to 2.0 and then remains constant. The optimum temperature and maximum conversion of NOx reduction decrease with increasing concentrations of alcohol additives ($CH_3OH$, $C_2H_5OH$). With an addition of polyethylene oxide (PEO; M.W. = 600,000) into urea solution, power consumption to carry urea solution can be reduced. With an addition of PEO to urea solution, the efficiency of NOx reduction increases at lower temperatures since the rate of radical formation is faster than that of radical termination reaction and the mixing effect is promoted by increasing penetration length of droplets from the nozzle. Temperature window which covers the range of NOx reduction is widened and the optimum temperature decreases with an increase in the concentration of gas additives (CO, $C_3H_8$). The amounts of CO was varied from 1.0 to 4.0 of the relative molar ratio to NO and the molar ratio of urea to NO is 2.0. It has been found that CO additive provides wider temperature window for the optimum $NO$ reduction than that of urea solution only. The optimum temperature window shifted to lower reaction temperatures with increasing the molar ratio of CO/NO. Oxidation of CO in the presence of $H_2O$ promotes the supply of OH and O at lower temperatures. The availability of OH and O radicals may provide an environment of both NO reduction and $NH_2$ oxidation reactions to occur at lower temperatures. The presence of $SO_2$ gas in flue gas slightly reduces NOx reduction and ammonium salt is formed from the reaction between $SO_2$ and ammonia from the decomposition of urea. Among the tested liquid and gas additives, the enhanced urea solution ${[CH_3OH]/[NO]=0.5+PEO=50ppm}$ with ${[CO]/[NO]=1.0}$ gas additive is found to be the most effective one for NO reduction with wider effective temperature window. Since the additives can be ignited at lower temperatures than urea solution only, urea is more readily converted to nitrogenous intermediates by radicals formed from the additives in combustion.

서지기타정보

서지기타정보
청구기호 {MCHE 96031
형태사항 ix, 111 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 수록
저자명의 영문표기 : Young-Il Lim
지도교수의 한글표기 : 김상돈
지도교수의 영문표기 : Sang-Done Kim
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 90-93
주제 질소산화물저감
선택적무촉매환원법
요소용액
반응온도영역
NOx reduction
SNCR
Urea solution
Reaction temperature window
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