跳至主要内容

The Technical Analysis on Upgrade and Coupling of Low-Quality Coal

Read full paper at:
http://www.scirp.org/journal/PaperInformation.aspx?PaperID=51605#.VHKBdWfHRK1

Experimental study was conducted with regard to upgrading low-quality coal by low temperature pyrolysis technology and fluidization classification technology, which laid the theoretical foundation for research and development of low-quality coal upgrading process. Firstly, a pyrolysis pilot experiment of long-flame coal was performed and the optimum pyrolysis conditions were found. When the final pyrolysis temperature was 450?C and the residence time was 10 minutes, the content of semicoke volatile dry ash-free was about 22.89% and the content of semicoke ash was about 16.1%. More than 5% of the ash needs to be removed before entering the pyrolysis fluidized bed. Thus, classification tests were carried out to pick out the coal particles with the target size of 500 μm, using a gas-solid fluidized bed coal picker. It was found that the separating effect of coal particles was the most satisfactory when the inlet velocity at the bottom was 3.27 m/s. The percentage of particles with diameters less than 500 μm was as low as 28.7% in the coarse samples. Based on the test results, a novel process of low-quality coal upgrade and coupling was proposed, which realized the sorting, grading, drying and pyrolysis of low-quality coal through the multi-stage fluidized bed integrated process.
Cite this paper
Zhao, B. , Yao, Q. , Lu, S. , Wang, Q. and Lv, J. (2014) The Technical Analysis on Upgrade and Coupling of Low-Quality Coal. Energy and Power Engineering, 6, 467-472. doi: 10.4236/epe.2014.613039. 
 

[1] Li, Z., Yu, W., Yang, C. and Zhou, A.N. (2013) Actuality and Expectation on Upgrading Utilization of Low-Rank Coal. Mining & Processing Equipment, 41, 1-6.
[2] Gu, X.-Y. (2009) Study on the Upgrading Process of Low-Rank Coal by the Thermalmodification. Clean Coal Technology, 1, 89-92.
[3] Wang, J.-G. and Zhao, X.-H. (2012) Demonstration of Key Technologies for Clean and Efficient Utilization of Low-Rank Coal. Bulletin of the Chinese Academy of Sciences, 27, 382-388.
[4] Guan, J., He, D.-M. and Zhang, Q.-M. (2011) The Technology of Improving Lignite Quality through Pyrolysis and the Concept of Poly-Generation. Coal Chemical Industry, 39, 1-4.                                  eww141124lx
[5] Qian, W. (2012) Experimental Study on Medium-Low Temperature Pyrolysis of Low Rank Bituminous Coal and Characterization of Pyrolysis—Derived Products. Ph.D. Thesis, China University of Mining and Technology, Beijing.
标签：

评论

发表评论

此博客中的热门博文

Does Immigration Promote the Investment of the Monopolistic Firm?

In the present paper, we examine the effect of increasing uncertainty of immigrants’ growth on the optimal timing of investment of a firm that has a monopolistic power over the labor market. It is revealed that when the uncertainty of immigrants’ growth is more than a threshold level, increasing uncertainty of immigrants’ growth accelerates the optimal timing of firms’ investment and enhances the economic growth, even if the uncertainty of immigrants’ growth is formulated by the geometric Brownian motion, which is in sharp contrast to the standard result that an increase in the uncertainty postpones the optimal timing. With an increase in the immigrants over the past ten years, workforces in the host countries have been growing significantly to the extent that the immigrants represent 70% of the increase in the workforce in Europe, and 47% in the United States as OECD indicates. In the present paper, we attempted to investigate the effect of increased uncertainty caused by the growi...
发表评论
阅读全文

Education Policy Implementation: A Mechanism for Enhancing Primary Education Development in Zanzibar

Education is one of the fundamental rights of individuals; therefore, the government of a country needs to develop and strengthen educational policy and quality as well as to ensure that everyone has equal access to basic education. The improvement of access and quality of education in the world is becoming as an essential factor in development, whereas the basic education (primary school), is acknowledged as a foundation of the higher educational development for every country. To fulfill this goal, governments introduce several policies and procedures; however, it requires some reforms and participation from the politician, policymakers, and other stakeholders to re-examine educational policy so that it can lead to multiplication and betterment of the reforms. Educational reforms actually focus on accountability. A positive educational development and reform is very challenging and needs more effort and strategy on how to use and utilize the resources effectively as such it can achie...
发表评论
阅读全文