고체분말의 유동화

소개

1. 초록

유동층 반응기는 고체입자와 유체사이의 접출율이 좋기 때문에 공업적으로 여러 가지 반응장치에 사용되고 있다.
일반적으로 유동화 과정은 고정층에서 입체유동화, 초기유동화, 밀집상 유동화, 분산상 유동화로 진행된다. 전체적으로 유속이 증가함에 따라 층내의 압력강하가 증가한다. 그러나 초기유동화에서 밀집상 유동화 단계는 압력강하가 일정하게 유지되는데 이를 실험을 통해서 알아보며 또한 초기 유동화가 일어나는 최소유동화 속도도 그래프를 통해서 얻는다.
유동층은 고체입자와 유체사이의 접촉율이 좋기 때문에 열전달이 잘 일어난다. 일반적으로 공업적 규모의 장치의 열전달은 유체를 통한 열전달의 3~5배 정도에 달하는데 이 또한 실험을 통해서 유체와 유동층사이의 열전달 효과를 비교해보기로 하자.

목차

<목 차>

1. 초록 ························································································································································ 2

2. 서론 ······················································································································································ 2 ~ 6
2-1 목적 ················································································································································· 2
2-2 이론적 배경 ···························································································································· 2

3. 실험과정 ······································································································································· 6 ~ 8
3-1 실험 장치 ··································································································································· 6
3-2 실험 방법 ··································································································································· 8

4. 실험 결과 ······································································································································· 9

5. 결과 분석 ······································································································································ 12

6. 결론 ······················································································································································· 16

7. 참고문헌 ········································································································································ 17

8. 인용부호 ········································································································································· 17

본문내용

1. 초록
유동층 반응기는 고체입자와 유체사이의 접출율이 좋기 때문에 공업적으로 여러 가지 반응장치에 사용되고 있다.
일반적으로 유동화 과정은 고정층에서 입체유동화, 초기유동화, 밀집상 유동화, 분산상 유동화로 진행된다. 전체적으로 유속이 증가함에 따라 층내의 압력강하가 증가한다. 그러나 초기유동화에서 밀집상 유동화 단계는 압력강하가 일정하게 유지되는데 이를 실험을 통해서 알아보며 또한 초기 유동화가 일어나는 최소유동화 속도도 그래프를 통해서 얻는다.
유동층은 고체입자와 유체사이의 접촉율이 좋기 때문에 열전달이 잘 일어난다. 일반적으로 공업적 규모의 장치의 열전달은 유체를 통한 열전달의 3~5배 정도에 달하는데 이 또한 실험을 통해서 유체와 유동층사이의 열전달 효과를 비교해보기로 하자.
2. 서론
① 목적
유동층 반응기에서의 유동화 과정과 유동층에서의 열교환을 이해한다.
② 이론적 배경
- 유동화의 도입
고체입자와 유체의 접촉을 다루는 일반 공정에서 종래의 고정층식 반응기의 효율은 여러가지 면에서 불만족스런 면을 지니고 있다. 고체입자와 유체의 접촉률을 향상시키기 위해서 유동층 반응기가 도입되었으며, 유체를 반응기 아래에서 불어넣어 고체입자를 부유시키며 공업적으로 흡수, 흡착, 건조, 연소 등의 반응에 사용된다.
- 유동화의 진행과정
A 구간 : 고정층 변화없이 유체가 통과하는 구
간이다.
B 점 : 층이 재배열되는 최소점이다. 이때의 유
속이 최소유동화 속도(U)가 된다.
C 구간 : 응집상 유동화가 일어나는 구간으로
압력강하의 변화가 없다.
D 구간 : Slugging 현상과 분산상 유동화가

참고자료

· Warren L. McCabe / Unit Operations of Chemical Engineering /7th Edition / McGraw-Hill Korea / pp39~57 / 2005년 10월