Simulation and Research of Boiler Combustion Process Based On the Improved RBF Neural Network

Rong, Panxiang; Sun, Jianpeng; Liu, Zhaoyu; Lin, Yu Cheng; Dong, Wenbo

doi:10.14257/ijunesst.2013.6.5.08

Cited by 3 publications

(1 citation statement)

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“…This division is in space, and the reduction layer exists above the oxidation layer . The reduction layer appears because of a lack of O 2 and char gasification . Layering may occur between particles or within a single particle .…”

Section: Results and Discussionmentioning

confidence: 99%

Influence of Oxidation–Reduction Layering on Fuel Nitrogen Oxide Emissions during a Char Grate-Fired Process

Gao

Zhao

et al. 2017

Energy Fuels

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Previous studies have found that the nitric oxide (NO) trend above the fuel seam of a chain boiler is opposite that of a reciprocating grate boiler. We have researched the factors that influence fuel NO emissions during the char grate-fired process by changing the char/oxygen (O2) ratio in a small-scale one-dimensional fixed-bed system. With an increase in the char/O2 ratio compared to the mass loss of char, the advent of excess O2 is delayed and carbon monoxide (CO) is generated. As a result, oxidation–reduction layering of char occurs. Char grate firing leads to an increase in char mass of the complete oxidation layer, and a thicker ash layer covers the char surface. The reduction layer and low-O2 region of the oxidation layer favor NO reduction; therefore, NO emission is delayed or shows a double-peak trend. The ash layer covering and a long residence time at a high temperature increase the NO generation rate of the oxidation layer. However, the overall NO generation rate is controlled by the reduction and oxidation layer, and an optimal char/O2 ratio exists, which makes the overall NO generation rate the lowest. A difference in the NO trend between the chain boiler and reciprocating grate boiler in and after the O2-deficient zone is because of the influence of the reciprocating disturbance on the reduction layer, ash layer, and char N release.

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Section: Results and Discussionmentioning

confidence: 99%