Development a modified crossing point temperature (CPTHR) method to assess spontaneous combustion propensity of coal and its chemo-metric analysis

Mohalik, N.K.; Lester, E.; Lowndes, I.S.

Abstract

Spontaneous combustion of Indian coals was investigated using spontaneous combustion rig at University of Nottingham, UK to assess their susceptibility. In the present study authors have used eleven coal samples collected from the Jharia coalfield (JCF), India. Both thermal as well as gas profiles from spontaneous combustion rig were studied critically to develop a modified crossing point temperature to assess the spontaneous combustion propensity of coal. The product of combustion gases (CO, CO2, CH4, and H2) emitted from spontaneous combustion rig within the temperature range between ambient and 300 0C of these coal samples were studied. The initial product of combustion gas i.e. CO followed by H2 indicates propensity towards oxidation of coal in laboratory condition for Jharia coalfield. The temperatures at which CO and H2 releases in the level of 50ppm (TCO50, TH250), crossing point temperature of coal (CPTCT) (temperature of coal and bath temperature is same) and modified crossing point temperature of coal (CPTHR) (temperature where dT/dt is equal to 2.0 oCmin-1 because heating rate is double of programme temperature 1 oCmin-1) determined from spontaneous combustion rig categorises the coal as per their propensity to spontaneous combustion. The results of these methods have been compared with other standard method i.e. crossing point temperature method – India, which is widely adopted in Indian regulatory bodies to verify the suitability of this method.

Citation

Mohalik, N., Lester, E., & Lowndes, I. (2018). Development a modified crossing point temperature (CPTHR) method to assess spontaneous combustion propensity of coal and its chemo-metric analysis. Journal of Loss Prevention in the Process Industries, 56, 359-369. https://doi.org/10.1016/j.jlp.2018.09.00

• Journal Article Type: Article
• Acceptance Date: Sep 9, 2018
• Online Publication Date: Sep 12, 2018
• Publication Date: 2018-11
• Deposit Date: Sep 17, 2018
• Publicly Available Date: Sep 13, 2019
• Print ISSN: 0950-4230
• Electronic ISSN: 1873-3352
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 56
• Pages: 359-369
• DOI: https://doi.org/10.1016/j.jlp.2018.09.00
• Keywords: Spontaneous Combustion, Spontaneous combustion Rig, Crossing Point Temperature
• Public URL: https://nottingham-repository.worktribe.com/output/1078275
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0950423018303176?via%3Dihub