Niroj Kumar Mohalik
@cimfr.nic.in
Senior Principal Scientist
CSIR-CIMFR Dhanbad
RESEARCH INTERESTS
Mine Nevironment, Ventilation, Fire and Safety
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Asfar Mobin Khan, Niroj Kumar Mohalik, Santosh Kumar Ray, Debashish Mishra, Jai Krishna Pandey, and Somu Mandal
Springer Nature Singapore
Debashish Mishra, N. K. Mohalik, D. P. Mishra, S. K. Ray, Asfar M. Khan, and J. K. Pandey
Springer Nature Switzerland
Debashish Mishra, N. K. Mohalik, D. P. Mishra, S. K. Ray, and J. K. Pandey
Springer Science and Business Media LLC
Asfar Mobin Khan, Santosh Kumar Ray, Niroj Kumar Mohalik, Debashish Mishra, Somu Mandal, and Jai Krishna Pandey
Springer Science and Business Media LLC
Santosh Kumar Ray, Asfar Mobin Khan, Niroj Kumar Mohalik, Debashish Mishra, Somu Mandal, and Jai Krishna Pandey
Elsevier BV
Somu Mandal, Niroj Kumar Mohalik, Santosh Kumar Ray, Asfar Mobin Khan, Debashish Mishra, and Jai Krishna Pandey
Elsevier BV
Niroj Kumar Mohalik, Santosh Kumar Ray, Debashish Mishra, Jai Krishna Pandey, Somu Mondal, Asfar Mobin Khan, and Ranvijay Kumar Singh
Informa UK Limited
ABSTRACT Spontaneous combustion of coal in stockpiles of power plants has a significant problem worldwide which leads to several health hazards, environmental pollution and coal loss. Spontaneous combustion coal stockpiles depend on both endogenous (coal characteristics) and exogenous parameters (stockpile geometry, wind speed, wind direction, local temperature). This paper describes the laboratory experiments to study the suitability of firefighting chemicals on the spontaneous combustion/fire of coal in stockpiles. Coal samples were collected from four different heaps of coal laid in coal storage yards of Talwandi Sabo Power Limited (TSPL), Punjab. This study comprises laboratory analysis i.e., proximate analysis, ultimate analysis, critical oxidation temperature, differential scanning calorimetry (DSC) analysis, gross calorific value (GCV), particle size analysis, and field studies i.e., thermal monitoring of fire-affected area before and after firefighting chemicals. Experiments on mixtures of coal and firefighting chemical having compositions viz. 1, 2, 3, and 5%, were carried out using DSC study for optimization of inhibitors as well as its efficacy. During the laboratory study the chemical composition of 3% was found to be optimum for field application to extinguish coal stockpile fire.
Niroj Kumar Mohalik, Edward Lester, and Ian S. Lowndes
Springer Science and Business Media LLC
Niroj Kumar Mohalik, Asfar Mobin Khan, Santosh Kumar Ray, Debashish Mishra, Nikhil Kumar Varma, Ran Vijay Kumar Singh, and Pradeep Kumar Singh
Informa UK Limited
ABSTRACT Spontaneous combustion is one of the key issues in the blasting gallery (BG) method of coal mining. Earlier most of the BG panels have been sealed due to the occurrences of spontaneous heating during the extraction of the panel. This research paper describes a study on spontaneous heating/fire mechanism in depillaring panels of thick seam mining using laboratory experiments, calculating goaf ignition temperature, field investigation and computational fluid dynamics (CFD) techniques. The laboratory study, i.e. Proximate analysis, ultimate analysis, Sulphur analysis, CPT study, DSC study indicated that coal is prone to spontaneous heating. The CFD simulation study reveals that spontaneous heating of leftover coal in goaf areas alone cannot be responsible for the fire in the BG panel. It indicates that an increase in temperature of the goaf is proportional to the amount of coal left in the goaf region. CFD study for roof fall in leftover coal in the goaf region along with spontaneous heating establishes that temperature rise in goaf is proportional to roof fall area of the panel. The laboratory, field and CFD simulation study clearly verify that spontaneous heating/fire in BG panel is due to the combination of spontaneous heating in leftover coal, and frictional heat generated due to roof fall.
Santosh Kumar Ray, Niroj Kumar Mohalik, Asfar Mobin Khan, Debashish Mishra, Nikhil Kumar Varma, Jai Krishna Pandey, and Pradeep Kumar Singh
Elsevier BV
Niroj Kumar Mohalik, Edward Lester, and Ian Stuarts Lowndes
Informa UK Limited
ABSTRACT Petrographic studies are commonly used to categorize the potential utilization of coals. Eleven coal samples from the Jharia coalfield (JCF), India, were studied using petrographic techniques to investigate maceral content, reflectance, and textural characteristics. Multiple test samples of each coal were slowly oxidized under controlled laboratory conditions from an ambient temperature of 30°c to 300°c to investigate the morphology of oxidized coals. The petrographic characterization of coals before and after oxidation showed significant changes in both morphology and vitrinite reflectance. The oxidation of coal particles produced three predominant textural changes: particles with homogeneous change of reflectance (HCv), particles with oxidation rims (ORv), and particles with no changes were observed (Uv), respectively. These textural characteristics were used to indicate how particles had interacted with oxygen at low temperatures during the early stages of oxidation. The morphological classification developed provides an alternative method to confirm the susceptibility of a coal to spontaneous combustion. Conventional thermal parameters such as crossing point temperature (CPT) were unable to identify the coals prone to spontaneous combustion. However, certain petrographic parameters could be combined with CPT values to provide a much more accurate measure for susceptibility to spontaneous combustion.
Santosh Kumar Ray, Asfar Mobin Khan, Niroj Kumar Mohalik, Debashish Mishra, Nikhil Kumar Varma, Jai Krishna Pandey, and Pradeep Kumar Singh
Informa UK Limited
Thermal power units are a major source of power generation in India. Belt conveyor is the leading transportation system in a thermal power plant. Belt conveyor fire in a thermal power plant breaks ...
Niroj K. Mohalik, Debashish Mishra, Santosh K. Ray, Nikhil K. Varma, Asfar M. Khan, and Nageshwar Sahay
Springer Science and Business Media LLC
N.K. Mohalik, E. Lester, and I.S. Lowndes
Elsevier BV
N. K. Mohalik, E. Lester, and I. S. Lowndes
Informa UK Limited
Abstract This paper presents a critical review of the different techniques developed to investigate the susceptibility of coal to spontaneous combustion and fire. These methods may be sub-classified into the two following areas: (1) Basic coal characterisation studies (chemical constituents) and their influence on spontaneous combustion susceptibility. (2) Test methods to assess the susceptibility of a coal sample to spontaneous combustion. This is followed by a critical literature review that summarises previous research with special emphasis given to Indian coals.
N. K Mohalik, E. Lester, I.S. Lowndes, and V. K. Singh
Informa UK Limited
ABSTRACT There are a significant number of uncontrolled coal mine fires (primarily due to spontaneous combustion of coal), which are currently burning all over the world. These spontaneous combustion sources emit greenhouse gases (GHGs). A critical review reveals that there are no standard measurement methods to estimate GHG emissions from mine fire/spontaneous combustion areas. The objective of this research paper was to estimate GHGs emissions from spontaneous combustion of coals in the Indian context. A sampling chamber (SC) method was successfully used to assess emissions at two locations of the Enna Opencast Project (OCP), Jharia Coalfield (JCF), for 3 months. The study reveals that measured cumulative average emission rate for CO2 varies from 75.02 to 286.03 gs−1m−1 and CH4 varies from 41.49 to 40.34 gs−1m−1 for low- and medium-temperature zones. The total GHG emissions predicted from this single fire affecting mines of JCF vary from 16.86 to 20.19 Mtyr−1.
Jitendra Pandey, Dheeraj Kumar, Virendra Kumar Singh, and Niroj Kumar Mohalik
Current Science Association
Phenomenon of coal mine fire has a long history on international magnitude in the destruction of valuable natural resources. It dominantly contributes towards adverse impact on environment. Societal influence in terms of health and life hazard is one of the key factors in mine fire areas. This paper focused on socio-economic and environmental impacts of fire in Jharia coalfield (JCF), Jharkhand, India. Issue related to mine fire in various legislations (Mines Act 1952, Coal Mine Regulation 1957, etc.) has been discussed with a view to overcome such situations. A few mitigative measures and proper management of coal mine fire has also been suggested.
J. Pandey, N. K. Mohalik, R. K. Mishra, A. Khalkho, D. Kumar, and V. K. Singh
Springer Science and Business Media LLC
N. K. Mohalik, D. C. Panigrahi, and V. K. Singh
Springer Science and Business Media LLC
N. K. Mohalik, V. K. Singh, and R. V. K. Singh
Springer Science and Business Media LLC