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Experimental Research on Fine Pulverized-coal and Optimal Design of Circulating Fluidized-bed Boiler

Author: YanHai
Tutor: ZuoKeFa
School: Zhejiang University
Course: Engineering Thermophysics
Keywords: Reburning Nitrogen oxides (NO_x) Superfine Pulverized Coal Particle size distribution Artificial Neural Networks Circulating fluidized bed Optimal design
CLC: TK229.6
Type: Master's thesis
Year: 2005
Downloads: 110
Quote: 0
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Abstract


Nitrogen oxides (NO_x) combustion (especially coal) process gas is caused by acid rain, the greenhouse effect, resulting in one of photochemical smog and ozone-depleting substances has become a global air pollution problems facing. Pulverized coal combustion field with the environmental requirements, improve control of NOx emissions and low NOx pulverized coal combustion theory and technology has become an important issue, which reburning technology is a common method. This technology is low cost, easy to implement, and out-of-stock and high efficiency, it is one of the most effective method of reducing NOx emissions. Global This is a lot of research and industrial applications, NOx is reduced to more than 50%. This paper first discusses the failure mechanism of NOx formation in coal combustion process and NOx. Of technical measures to control NOx formation reburning reduction mechanism and impact of NOx reburning further pointed out that the ultrafine coal reburning reduce NOx has considerable appeal and feasibility. A large number of test findings superfine pulverized coal as reburning fuel to reduce NOx emissions better, but to achieve this technology is a key problem is how to obtain superfine pulverized coal. Comparative analysis of the wind once reburning and tertiary air reburning and the common inertial separator institutions case, combined with research and analysis of the Zhenhai Power Plant 670t / h boiler unit, primary air ultrafine powder reburning initial program, the impact block fine powder separation test in the selection of a conventional power plant fine degree of pulverized coal as raw powder, were studied in gas-solid multiphase flow test rig, come to a of multiple factors fine powder prepared law, under conditions that meet shades than further investigate the particle size distribution of the shades on both sides, for suitable both provide coal density, but also to meet the pulverized coal particle size the inertial separation device provides the experimental and theoretical basis, Micronized Coal Reburning industrial applications lay a foundation. Circulating fluidized bed boiler NOx emissions by boiler design parameters affect, and interaction between various parameters, has a strong coupling mutual relations is difficult to express the conventional formula, the artificial neural network technology with powerful Lenovo function and memory function, and use BP neural network for nonlinear mapping ability of the variables to optimize the design model to establish a large-scale circulating fluidized bed boiler model factors to affect the target value for the input variable NOx production output variable training data sample collected by the power plant, it can be run in automatic learning to adapt to a wide capacity range, and in accordance with the model proposed the boiler optimization design method to ensure that the boiler combustion pollutant emissions optimal.

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CLC: > Industrial Technology > Energy and Power Engineering > Steam Power Engineering > Steam boiler > Various types of boilers > Coal-fired boilers
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