Experimental Research On Fine Pulverized-coal And Optimal Design Of Circulating Fluidized-bed Boiler

NO_X is one reason of acid rain, greenhouse effect, photochemical fog and breakage of ozonosphere, which is produced by combustion(especily combustion of coal). It has become the global problem of air pollution. By the reason of increase of environment protection issue, it is an important task that people control the emission of NO_X and study the theory of combustion of pulverized coal for low NO_X emission in the field of pulverized coal burning. One of these is fuel reburning. It is one of the effective method of low NO_X emission for it low cost, easy realization and high effective of NO_X emission. Plentiful investigation has been done and it has been applied in industry. And NO_X emission to more than 50 percent.The paper researched on the creation and breakage mechanism of NO_X from coal-fired boilers. Especially researched on the technology which controls the creation of NO_X. The mechanism of reburning which deoxidizes NO_X and the main influential factors of reburning is also researched on in the paper. More attraction and feasibility of method of reburning using superfine pulverized coal is put forward.A great deal of test works have shown that fine coal can can be used for reburning and its effect is very good. The key problem to realize this technology is how to get fine caol. The primary scheme of superfine pulverized coal reburning of first wind is brought forward in the paper by the analysis of 670t/n boiler of ZhenHai power plant after the analyse of the first wind reburning and the third wind beburning and familiar and inertial separate machine. The experimentation is done on test-bed of multiphase liquid using the pulverized coal of groovy diameter. The rule that effects fine pulverized coal creation is gained in the paper. The particle distribution of shade of both sides is investigated when shade proportion is satisfied. It offers theoretical and experimental base for inertial and separate equipment that can furnish appropriate pulverized coal shade and groovy diameter. It is base for industrial application of fine pulverized coal reburning.Because of the complexity of the NO_X production mechanism, it is very difficult to establish an exact mathematical model to estimate the production of NO_X emission.