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| Gas/particle flow and pressure variation characteristics of Ende pulverized coal gasifier equipped with ejector | |
| Song, Minhang1; Tang, Di2; Liu, Xiaoying2; Xu, Yang3 | |
| 2023-01-09 | |
| Source Publication | ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING
 |
| ISSN | 1932-2135 |
| Pages | 13 |
| Abstract | Ende pulverized coal gasifier (EPCG), as a typical representative of circulating fluidized bed gasifier, has been widely used in gasification field. The return conduit of EPCG is generally not equipped with a feedback control device (FCD), which tends to result in a low solid circulation rate (G(s)) and high unburned combustibles in fly ash. To address these issues, a new technique using the ejector as the FCD was designed to provide a stable pressure barrier and improve solid circulation. Preliminary thermal experiments demonstrated the feasibility of improving the EPCG with injector system. Currently, the specific mechanisms that contribute to further optimize this technology have not been systematically studied. Considering the large impact of ejector operation on solid circulation rate and stability as well as syngas production, this work adopts a gas/particle 1:15 cold EPCG bench to investigate the gas/particle flow and pressure variation characteristics before and after ejector operation and under different working medium pressures (P-p). When the ejector operates at the design pressure P-s = 0.187 MPa, the outlet pressure of the return conduit is slightly larger than the furnace bottom pressure, thus preventing the reverse gas flow at the furnace bottom. The particle velocity and concentration distribution in the furnace are basically consistent with that without the ejector, showing a similar central spout region and near-wall annulus flow region. As P-p increases from 0.04 to 0.24 MPa, the average particle velocity in the return conduit increases from 0.95 to 2.4 m/s, the particle concentration decreases from 0.088 to 0.051, and the solid circulation rate increases from 0.37 to 0.53 kg/h. The ejector outlet pressure gradually increases, the inlet pressure decreases, and the pressure barrier provided by the ejector rises from 1052 to 3640 Pa. When P-p is 0.12 MPa, the ratio of G(N2)/G(air) is 0.91%, which can achieve the purpose of continuous and stable pressurization with a small amount of nitrogen. |
| Keyword | ejector Ende pulverized coal gasifier particle concentration pressure variation solid circulation |
| DOI | 10.1002/apj.2877 |
| Language | 英语 |
| WOS Keyword | GAS-SOLID FLOW ; CIRCULATING FLUIDIZED-BED ; GASIFICATION CHARACTERISTICS ; L-VALVE ; STEAM ; SIMULATION ; PARTICLES ; HYDRODYNAMICS ; RATIO |
| Funding Project | National Natural Science Foundation of China ; [52006120] |
| WOS Research Area | Engineering |
| WOS Subject | Engineering, Chemical |
| Funding Organization | National Natural Science Foundation of China |
| WOS ID | WOS:000909403300001 |
| Publisher | WILEY |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ipe.ac.cn/handle/122111/56437 |
| Collection | 中国科学院过程工程研究所 |
| Corresponding Author | Liu, Xiaoying |
| Affiliation | 1.Chinese Acad Sci, Inst Proc Engn, Beijing, Peoples R China 2.Inner Mongolia Univ Technol, Coll Energy & Power Engn, 45 Aimin St, Hohhot 010000, Inner Mongolia, Peoples R China 3.Huaneng Clean Energy Res Inst, Beijing, Peoples R China |
| Recommended Citation GB/T 7714 | Song, Minhang,Tang, Di,Liu, Xiaoying,et al. Gas/particle flow and pressure variation characteristics of Ende pulverized coal gasifier equipped with ejector[J]. ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING,2023:13. |
| APA | Song, Minhang,Tang, Di,Liu, Xiaoying,&Xu, Yang.(2023).Gas/particle flow and pressure variation characteristics of Ende pulverized coal gasifier equipped with ejector.ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING,13. |
| MLA | Song, Minhang,et al."Gas/particle flow and pressure variation characteristics of Ende pulverized coal gasifier equipped with ejector".ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING (2023):13. |
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