Abstract
This paper introduces a technology of preparing bed material with bottom slag of circulating fluidized bed boiler, and designs the system of filling the bed material into the furnace, which has been applied in engineering. This technology uses bottom slag to prepare bed material. Through screening treatment of developed ultra-fine roller screen, the bed material with particle size meeting combustion requirements is prepared and fed into fluidized bed furnace. It not only ensures the combustion effect of the boiler, but also saves a lot of bed material procurement and operation costs, at the same time, it reduces the discharge of boiler bottom slag, which is conducive to reducing pollutant emission. Moreover, some limestone which is not involved in the desulfurization reaction in the furnace is screened out and returned to the furnace again as bed material, so as to improve the utilization rate of limestone powder. The success of this system in engineering application provides a low-cost and reliable new bed material preparation and filling method for the industry, and provides a reliable guarantee for the combustion of CFB boilers. The system meets the requirements of energy conservation and environmental protection, enriches the auxiliary system of CFB boiler, improves the supporting level of auxiliary system of CFB boiler, and further promotes the application of clean combustion fluidized bed unit.
Highlights
With the increasing consumption of energy in society, it is more and more important to solve the problem of environmental pollution in energy production process
The results show that the combustion temperature of fluidized bed boiler is low (850 ~ 900°C), the emission of Nitrogen Oxides is low, the fuel adaptability is wide, the combustion efficiency is high, the desulfurization cost is low, and the load regulation ratio is large
According to the requirements of the boiler plant, if the quartz sand is used as the bed material, the particle size should be less than 1mm; if the bottom slag is used, the particle size should be less than 3 mm
Summary
With the increasing consumption of energy in society, it is more and more important to solve the problem of environmental pollution in energy production process. The results show that the combustion temperature of fluidized bed boiler is low (850 ~ 900°C), the emission of Nitrogen Oxides is low, the fuel adaptability is wide, the combustion efficiency is high, the desulfurization cost is low, and the load regulation ratio is large. It makes fluidized bed a clean combustion mode with high efficiency and low pollution. In the combustion process of circulating fluidized bed boilers, bed material is an important part of fuel combustion. According to the requirements of the boiler plant, if the quartz sand is used as the bed material, the particle size should be less than 1mm; if the bottom slag is used, the particle size should be less than 3 mm
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