Zhundong area in Xinjiang Uygur Autonomous Regions, China is rich in subbituminous coal reserves. Zhundong coal is characteristic of low mining cost and fine reactivity. However, the serious slagging and fouling occurring on the heating surface because of the high sodium content of Zhundong coal leads to very dangerous and uneconomical operation of Zhundong coal-burning boilers. Here, A method using a washing solution to remove sodium from the coal is presented and the effects of temperature, pressure and washing solution amount on the sodium removal from Zhundong coal was investigated. The experimental results show that the temperature employed is the main influencing factor for sodium removal and pressure has little influence on the results. After treatment with the right processing conditions, the upgraded Zhundong coal with the sodium content below 2% (based on ash yield) is obtained and the sodium removal efficiency is higher than 70%.
Bio-char with high fixed carbon yield is a potential material for barbecue and hot pot fuel. In the study, the effects of the process conditions including raw materials, carbonization temperature and residence time on the combustion characteristic of the resulted bio-char were investigated. Here, bio-char yield and combustion characteristic were used as evaluation indexes. It is foud out that the bio-char prepared from cotton stalk under the conditions of the final temperature of 500 oC and the residence time of one hour shows the best combustion characteristics.
The technology of downstream vibrated bed dryer with high temperature flue gas has been applied successfully by CPI Mengdong Energy Group Co., LTD for the large scale upgrading of Baiyinhua lignite. It is very necessary to study the drying process of a single lignite particle by high temperature flue gas. Based on finite volume method, the numerical simulation was applied in the lignite drying process and the mathematical model for the drying process of a single spherical lignite particle with high temperature flue gas was developed. Here, the lignite particle was divided into dry region and wet region by water evaporation interface. To accelerate convergence and make stable domain larger and truncation error smaller in the solution process, Crank-Nicolson six-point difference iteration method was used to solve the model.
The drying experiments of three typical kinds of Inner Mongolia lignite were conducted on a self-designed apparatus. The proximate analyses and oxygen adsorbing capacities of all the samples were analyzed on an industrial analyzer and a coal spontaneous combustion tendency tester. The results show that the treated samples show no apparent changes in their properties compared to the original lignite and no pyrolysis or combustion phenomenon occurs in the drying process. It is also observed that the oxygen adsorbing capacity of the dewatered sample is lower than that of the original lignite. Especially the oxygen adsorbing capacity of the lignite sample undergoing high-temperature drying process decreases significantly. Considering the amount of adsorbed oxygen can reflect the spontaneous combustion tendency of coal to a certain extent, the spontaneous combustion tendency of the treated lignite decreases.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.