Overview
Medium lump coal is a versatile fossil fuel characterized by its moderate particle size, typically ranging from 25mm to 80mm. This form of coal bridges the gap between fine coal powders and large coal blocks, offering balanced combustion properties for various industrial applications. As a sedimentary rock with high carbon content, medium lump coal forms through the geological compression of organic matter over millions of years. Its standardized sizing makes it particularly suitable for automated feeding systems in industrial boilers and furnaces, where consistent particle size ensures efficient combustion.
Physical and Chemical Properties
Medium lump coal typically exhibits a black, shiny appearance with visible layers of organic deposition. Its physical structure provides good permeability for combustion air while maintaining structural integrity during handling and transport. The chemical composition varies by source but generally contains 60-80% carbon, with the remainder consisting of hydrogen, oxygen, nitrogen, sulfur, and mineral matter. The calorific value ranges between 5,500-7,000 kcal/kg, making it suitable for energy-intensive processes. Its moderate moisture content (typically 5-15%) and low volatile matter contribute to stable combustion characteristics.
Main Applications
In power generation, medium lump coal serves as a reliable fuel for circulating fluidized bed (CFB) boilers, offering balanced combustion characteristics. Its particle size ensures proper fluidization while minimizing elutriation losses. The metallurgical industry utilizes medium lump coal for coke production when blended with other coal types. Industrial heating applications include ceramic kilns, lime production, and steam generation. Some chemical plants employ it as a reducing agent or feedstock for gasification processes.
Safety and Storage
Proper storage of medium lump coal requires dry, well-ventilated areas with adequate spacing between piles to prevent spontaneous combustion. Storage yards should have proper drainage to prevent water accumulation, which can degrade coal quality. Handling precautions include dust suppression measures to prevent respiratory hazards and explosive dust clouds. Firefighting equipment should be readily available, with particular attention to using the correct extinguishing agents for coal fires (typically Class D extinguishers or water spray systems).
B2B Procurement Guide
Industrial buyers should specify critical parameters including calorific value, ash content (preferably below 15%), sulfur content (typically below 1% for environmental compliance), and moisture levels. Consistent sizing (with minimal fines) ensures optimal performance in automated feeding systems. Procurement strategies should consider long-term supply contracts to mitigate price volatility, with quality assurance through regular sampling and laboratory analysis. Logistics planning should account for the bulk density (approximately 0.8-1.0 t/m³) when arranging transportation and storage facilities.
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