산소공여입자에 의한 석탄의 연소특성

다국어 초록 (Multilingual Abstract)

Chemical-looping combustion (CLC) is a novel power generation technology and has many advantages such as no thermal NOx emissions and inherent CO2 separation without additional energy penalty. It is considered as good application of solid fuels such as coal, char, cokes and biomass to chemical looping combustion due to the low price. However, previous results are restrictive and more comprehensive investigation is prerequisite for development of solid fuel chemical looping combustion technology. This study is basic research to select appropriate oxygen carrier and coal by direct combustion tests of oxygen carriers and coals.
Devolatilization characteristics of four coals were measured in a thermogravimetric analyzer. The weight loss percent and the maximum devolatilization rate were proportional to the contents of (water vapor + volatile) and decreased in order of Roto, Kideco, Hyper, and Sunhwa coal.
Air combustion characteristics of four coals were measured in the thermogravimetric analyzer. The weight loss percent was proportional to the contents of (water vapor + volatile + fixed carbon). The maximum combustion rate decreased in order of Roto, Hyper, Sunhwa and Kideco coal. The maximum combustion rate was faster 4.7～8.0 times than the maximum devolatilization rate.
Direct combustion characteristics of four coals mixed with two different oxygen carriers were measured in the thermogravimetric analyzer. The direct combustion efficiency decreased in order of Roto, Kideco, Sunhwa and Hyper coal for both oxygen carriers. Moreover, OCN703-1100 oxygen carrier showed better combustion efficiency than OCN706-1100 oxygen carrier for four coals.
The reduction characteristics of two oxygen carriers for CH4, CO and H2 gases were measured in the thermogravimetric analyzer to investigate why OCN703-1100 oxygen carrier showed better combustion efficiency than OCN706-1100 for all coals. The OCN703-1100 oxygen carrier represented higher reduction rate than OCN706-1100 for all reducing gases. Moreover, the total pore area and the porosity of OCN703-1100 were higher than those of OCN706-1100 oxygen carrier.

The total volatile gas and volatile component of four coals were measured in the batch type fluidized bed reactor to investigate why the direct combustion efficiency decreased in order of Roto, Kideco, Sunhwa and Hyper coal for both oxygen carriers. The direct combustion efficiency was proportional to the total amount of (CH4+CO+H2) produced during devolatilization of coals.

목차 (Table of Contents)

• Ⅰ. 서 론 1
• 1. 연구배경 1
• 2. 연구 목적 및 범위 4
• Ⅱ. 이론적 고찰 8
• 1. 매체순환연소 8
• 2. 열중량분석기(TGA)에 의한 분석법 21
• 3. 회분식 유동층 반응기를 이용한 분석법 22
• 3.1 유동화의 정의 및 특성 22
• 3.2 배출기체의 농도분석 26
• Ⅲ. 실 험 28
• 1. 산소공여입자 28
• 2. 석탄 30
• 3. 실험장치 31
• 3.1 열중량분석기 31
• 3.2 회분식 유동층 반응기 33
• 4. 실험조건 및 방법 36
• 4.1 열중량분석기를 이용한 석탄의 탈휘발 및 연소실험 36
• 4.2 열중량분석기를 이용한 석탄의 직접연소 실험 37
• 4.3 열중량분석기에서 산소공여입자의 기체별 환원반응 실험 38
• 4.4 회분식 유동층 반응기에서 석탄의 탈휘발 실험 39
• Ⅳ. 결과 및 고찰 41
• 1. 열중량분석기를 이용한 석탄의 탈휘발 및 연소특성 41
• 2. 열중량분석기를 이용한 석탄의 직접연소 특성 51
• 3. 열중량분석기에서 산소공여입자의 기체별 환원반응 특성 62
• 4. 회분식 유동층 반응기에서 석탄의 탈휘발 특성 해석 71
• Ⅴ. 결 론 81
• References 83
• Abstract 89