Experimental Investigation for Co-Combustion Characteristics of Semi-Coke and Bituminous Coal in a 3 MWth Tangential Com
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https://doi.org/10.1007/s11630-020-1187-4
Article ID: 1003-2169(2019)00-0000-00
Experimental Investigation for Co-Combustion Characteristics of Semi-Coke and Bituminous Coal in a 3 MWth Tangential Combustion Facility GUAN Jingyu1,2*, YU Qiang2, SUN Rui1*, SHEN Tao2, WANG Minghao2, YAN Yanfei2, SONG Xin2 1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 2. State Key Laboratory of Efficient and Clean Coal-Fired Utility Boilers, Harbin Boiler Company Limited, Harbin 150046, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: An experimental investigation was conducted in a 3 MW pilot-scale tangential combustion facility to explore the co-combustion characteristics of bituminous coal mixed with semi-coke. The thermal gravimetric analyzer (TGA) was used to obtained fuel thermal analysis. The results presented effects of semi-coke blending ratio (BR) on average furnace temperature, ignition temperature, NO emission and combustion efficiency. The excess air coefficient in main combustion sections and outlet were fixed at 0.85 and 1.2 while BR increased from 0% to 50 wt%. The temperature profiles of combustion decreases along the height of furnace while average furnace temperature fluctuates slightly with an increasing BR. The concentration of NO has an increasing tendency with the increasing of BR. The ignition temperature obtained from TGA measurement agreed well with experiment result. In addition, combustion efficiency was not sensitive to BR and decreased slightly with the increasing BR.
Keywords: tangential combustion, semi-coke, blending ratio, combustion characteristics, experimental investigation
1. Introduction Semi-coke is a low-volatility solid carbon product obtained by dry distillation pyrolysis of high-volatility bituminous coal with no cohesiveness or weak cohesiveness. With the rapid development of coal chemical industry, China’s annual semi-coke production capacity is about 100 million tons. There is a serious excess of semi-coke due to insufficient demand for semicoke in traditional markets such as iron alloy reducing agent, calcium carbide reducing agent and chemical
Received: Jun 10, 2019 AE: TIAN Zhenyu
fertilizer gasification [1]. It is an important method to achieve clean and efficient grade utilization of coal that takes the semi-coke as a high-grade clean fuel for power generation [2]. However, there are usually problems such as poor ignition, low burnout rate, and high NOx emissions which should not be neglected. As a result, it is necessary to explore the combustion characteristics of semi-coke and to develop the clean and efficient combustion technology. It is noticed that most researches on combustion characters of semi-coke are based on thermogravimetry
Corresponding authors: SUN Rui GUAN Jingyu
E-mail: [email protected] [email protected] www.springerlink.com
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instrument (TG) system and laboratory-scale reactors. Wang et al. [3] investigated the inf
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