Process optimization for arsenic removal of fine coal in vibrated dense medium fluidized bed
Abstract The dry separation of fine coal provides a feasible, low-cost and pollution-free method for the pre-arsenic removal from coal prior to combustion. In this study, the arsenic (As) occurrence of the coal from Wangjiazhai coal mine in China and the corresponding migration law in the dissociation process were investigated. Accordingly, it was proposed for the vibrated dense medium fluidized bed (VDMFB) to be utilized, where it was suitable to separate the fine coal for As removal. The fluidization characteristics and the improvement of fluidization quality under the collaborative effect of vibration amplitude ( A ), vibration frequency ( f ) and air velocity ( U a ) were also explored. It was discovered that the fluidized bed density was uniform and beneficial to separate coal through settling velocity when the fluidization number, N v , was 1.0–1.83 with A of 0.5–3 mm and f of 5–30 Hz. Moreover, the bed density was driven to periodically fluctuate in a low range, based on the periodic vibration energy input in the bed. Furthermore, thirteen separation experiments for fine coal with various parameter combinations were executed through the Box-Behnken RSM method. The results demonstrated that the three operation parameters importance on the segregation degree of As content ( S As ) was as follows: vibration amplitude > air velocity > vibration frequency. Compared to raw coal, the As content of the clean coal was reduced by 81.06%, whereas a 90.29% of As was concentrated into the tailing, indicating that the VDMFB can achieve a satisfactory performance for the dry arsenic removal in coal. Highlights A pollution-free dry arsenic removal method from coal prior to combustion was proposed. The collaborative effect of vibration amplitude, frequency and air velocity were studied. The feasibility of separation for easily mismatched particles was explored. 90.29% of arsenic in raw coal was concentrated into the tailing product.
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기