The development of clean coal combustion technology with wide fuel adaptability is an important direction for China's energy development strategy. From the perspective of maturity of technology development, meeting environmental protection requirements and economic affordability, CFB combustion technology is a relatively realistic and low-cost, low-pollution technology that is actively being developed for many new coal-fired technologies. The energy-efficient coal-fired technology, through the supercritical and large-scale circulation of circulating fluidized bed boilers, can further increase the power generation efficiency and reduce the emission of greenhouse gases and pollutants. It is one of the hot spots in the current clean coal combustion technology field.
In the process of increasing the size of CFB boilers from subcritical parameters to supercritical ones, some key technologies include the uniformity of the inlet flow at the bottom of the furnace, the furnace height limit, the secondary air penetration capacity, and the gas-solid separator. Problems such as amplification effects are still at the exploratory stage. Studies have shown that one of the main factors constraining the development and application of large-scale CFB boilers is the lack of interaction mechanisms between the scales of the CFB system (large-scale structural factors and small-scale gas-solid flow characteristics). the study.
Institute of Engineering Thermophysics, Chinese Academy of Sciences Circulating Fluidized Bed Laboratory Wang Haigang's research team focused on large-scale, complex gas-solid flow systems, two-fluid model and CPFD discrete particle simulation method, combined with electrical capacitance tomography (ECT) and microwave Doppler Microwave Doppler studied the gas-solid flow characteristics of a full-circulation loop system with 6 to 8 gas-solid separators connected in parallel at different structural scales, and analyzed the correlation between gas-solid velocity and structural dimensions (Figure 1). The changing characteristics of the key parameters of the flow process, focusing on the uniformity of the gas-solid flow distribution of the multi-separator system (Figure 2); and the development of capacitance tomography algorithms and capacitive sensors of the combined structure under complex gas-solid flow conditions Based on the above numerical simulation platform and experimental methods, the gas-solid flow geometry parameters of the large-scale circulating fluidized bed are optimized, which provides an important theoretical basis for the large-scale design of the circulating fluidized bed boiler, and is a strategic pilot project of the Chinese Academy of Sciences. "Supercritical Circulating Fluidized Bed Combustion Technology and Demonstration" Topic Research and Development of Advantage Furnace Types Provides Technology stand by.
At the same time, through the research, a complex gas-solid flow numerical simulation platform and an imaging algorithm for capacitive tomography in a complex flow structure have been formed and applied to the measurement of key parameters of the gas-solid flow process in a fluidized bed particle preparation system for particle preparation. The process provides an online, non-destructive and rapid detection method.
The above research work has been supported by the National Natural Science Foundation of China major international cooperation research project and the Chinese Academy of Sciences' strategic pilot technology project. The relevant research results have been published in international journals Chemical Engineering Science, AIChE Journal, Powder Technology, IEEE Sensor Journal, IEEE Trans. On Instrumentation & Measurement magazine, will also give an invitation report at the 6th Asian Particle Technology Conference (APT2015) held in Korea.
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