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Consumables
Published in Carl Bozzuto, Boiler Operator's Handbook, 2021
Conveyors come in a wide variety of sizes and styles. Many use a belt, a wide, fabric reinforced rubber or synthetic rubber, riding on rollers that shape it into a trough that holds the coal. At some point in a belt conveyor system, the belt is pulled taught by a roller that is adjustable. The belt makes a full 180 degree turn over the roller. Belt conveyors are used mainly in large plants, where a constant movement of coal is required. Treat the belt with care. Sudden stopping and starting of large belt conveyors will tend to break the belt. One coal requires careful handling on conveyors. Coal from the Powder River Basin (PRB) in Wyoming and Montana is used throughout the country in pulverized coal fired boiler plants because of its lower sulfur content. PRB coal, however, is very friable (it breaks up easily) and it generates dust readily. After several explosions in conveyor systems, major rebuilds were required. When handling PRB coals, ventilate transfer sheds and other areas, thereby preventing flammable concentrations of airborne dust accumulation, and conveyors to reduce dust generation hot spots and sparking. Pay close attention to the special instructions normally received when a plant is switched to burn PRB coal.
Thermal Power Generation
Published in T.M. Aggarwal, Environmental Control in Thermal Power Plants, 2021
The choice of technology of Fluidized Bed Combustion (FBC) Boilers over the conventional Pulverized Fuel (PF) Boilers has several reasons. FBC boilers can handle a wide range of fuels with low heating values (as low as 1500 kcal/kg), high ash content (as high as 55 per cent) and high sulphur content. FBC is well suited for Indian high ash coal and high sulphur lignite. If a FBC boiler is designed for coal, the same boiler can be used to burn lignite and petroleum coke. The material handling and feeding system should be properly designed to meet these fuel variations. Such fuel flexibility is not available in the competing conventional pulverized coal-fired boiler technologies. This kind of fuel flexibility is required where uncertainty of fuel supply exists and economics are also an issue.
Consumables
Published in Kenneth E. Heselton, Boiler Operator’s Handbook, 2020
One coal requires careful handling on conveyors. Coal from the Powder River Basin in Wyoming and Montana is used throughout the country in pulverized coal fired boiler plants because of its lower sulfur content. PRB coal, however, is very friable (it breaks up easily) and it generates dust readily. After several explosions in conveyor systems major rebuilds were required when handling PRB to ventilate transfer sheds and other areas thereby preventing flammable concentrations of airborne dust accumulation and to conveyors to reduce dust generation hot spots and sparking. Pay close attention to the special instructions you normally receive when a plant is switched to burn PRB coal.
Application and comparative analysis of radiative heat transfer models for coal-fired furnace
Published in Numerical Heat Transfer, Part A: Applications, 2022
Shesh N. Dhurandhar, Ankit Bansal, Sivaram Pramod Boppudi, Medha Dakshina Murty Kadiyala
The pulverized coal-fired boiler furnace is one of the most critical parts of a thermal power plant. The furnace has to facilitate and accommodate several disturbances such as variations in fuel quality, part-load operations, coal blending operations, slagging, and fouling of heat transfer surfaces toward generating electric power under specified conditions. Occasionally, the blending of coals from various sources is required, causing variation in volatiles, moisture, and sulfur content. This situation is even more challenging with the use of supercritical technology as the bulk fluid temperature in the furnace water walls increases throughout its height, affecting the water wall’s safe and allowable metal temperatures. Designing the furnace for such conditions is challenging and needs detailed mathematical models and techniques to predict performance, safe limits of operation, and compliance with the environmental guidelines. Also, furnace performance significantly influences essential parameters like boiler efficiency, super-heater, and re-heater outlet temperatures that significantly impact overall power plant efficiency.