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Coal particle ash content has important influence on the bottom ash formation behavior in fluidized bed combustion. Therefore, experiments were conducted on a benchscale fluidized bed combustor to study their relationship. Yima bituminous coal was chosen as the experimental sample. Results show that the influence of coal particle size distribution upon the bottom slag size distribution is gradually...
Efficiency of parallel computation is always a fundamental research field in high performance computing. A study was carried out in this paper by combining the high performance parallel computing with numerical simulations of copper flash smelting furnace, to investigate influences of various factors upon the computing speed, such as the mesh types, the number of grid and CPU cores. It aims to provide...
The paper puts forward to the combined combustion technology of biomass and coal grate-firing and gasification, in which coal fires in the condition of rich fuel on the grate and biomass powder is in suspension combustion. Taking DZL6-1.25-AII as an example, the combustion characteristics of many combined combustion conditions are analyzed and the optimal combined combustion condition is determined...
In this paper, two typical Chinese coals were selected to investigate the pulverized coal combustion characteristic and their pore structure evolution in oxy-fuel combustion and conventional air combustion environment with a drop tube furnace (DTF). Results show that the burn-off rate of pulverized coal in O2/CO2 mixtures is lower than that in O2/N2 environment with equivalent oxygen concentration...
In order to provide references and bases for solving slag, agglomeration and corrosion problems that occurred during straw combustion, experiments on combustion of pure pulverized rice straw and mixture of pulverized rice straw with additives were carried out in a pilot plant. The additives included CaO, Al2(SO4)318H2O, CaSO4, and (NH4)H2PO4. Ion chromatography as well as XRD analysis have been conducted...
In this paper a type of ultra supercritical boiler was researched for BMCR operating condition numerical simulation with the CFD software Fluent. When this type of boiler burning design coal in the BMCR operating condition, the combustibles content of fly ash is low, the combustion efficiency is high and the emission of NOx is low. The maximum heat load of the wall is located between the burner and...
Coal blending has become an important way to ease the tension of coal purchase for many Chinese power plants. Mixed by pulverizers which has been widely used, is considered the most reasonable and convenient approach of coal blending. The implementation of this approach meet three main problems, that is to determine the optimum coal blending formula, to select the pulverizer combination for single...
Fast-growing trees are widely cultivated in the north-eastern of Thailand. The residues of them are plentifully. The aim of this research was the increase in yield of charcoal during cool down process under nitrogen atmosphere. Two kinds of wood residues, eucalyptus and bur-flower, were used for investigation. Charcoal production was carbonized in a high temperature resistant cement furnace. The procedure...
The paper presents an updating scheme for ash cooler fluidized air system of a 410 t/h CFB boiler. The ash cooler fluidized air, which is originally designed, is provided by the independent configuration of two forced fans. By analyzing and studying the operating data of the primary air and the ash cooler fluidizing air system at various operating conditions, an optimum scheme is put up that fluidizing...
Three kinds of pulverized coals were burnt in a laboratory-scale drop tube furnace, and an 8-stage Andersen particle impactor was employed for separating and sampling the ash particles after the pulverized coals combusting, in order to study the enrichment characteristics of trace elements in primary particulate matter during coal combustion. The PM samples were analysed by ICP-AES, the concentration...
Gasification based biomass co-firing was an attractive technology for utilizing biomass as an additional fuel in utility boilers. Compared to directly co-firing biomass and coal, it showed following benefits: (1) avoiding biomass delivery into the boiler, (2) reduced boiler slagging, (3) avoiding altered ash characteristics. In co-firing demonstration project, higher percentage of biomass gas for...
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