Effect of additives on fusion characteristic of ashes during rice straw combustion

被引：5

作者：

Ma X.-Q. ^{[1
,2
]}

Qin J.-G. ^{[1
]}

Luo Z.-Y. ^{[1
]}

Yu C.-J. ^{[1
]}

Fang M.-X. ^{[1
]}

Cen K.-F. ^{[1
]}

机构：

[1] Stake Key Laboratory of Clean Energy Utilization, Zhejiang University

[2] School of Mechanics and Electronics, Henan Institute of Science and Technology

来源：

Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2010年 / 44卷 / 08期

关键词：

Additives; Alkali metals; Fusion characteristic; Straw combustion; Thermal equilibrium calculation;

D O I：

10.3785/j.issn.1008-973X.2010.08.025

中图分类号：

学科分类号：

摘要：

In order to provide references and bases for solving the problem of slag and agglomeration that occurred during biomass thermal chemical transformation of straw, experiments on combustion of pure pulverized straw and mixture of pulverized straw with additives were carried out in a pilot plant. The additives which selected by thermal equilibrium calculation included aluminum powder, silicon powder, Al2O3, SiO2, Ca3(PO4)2, CaSiO3, CaCO3, Al2(SO4)318H2O, CaSO4, CaO and (NH4)H2PO4. By analyzing ash samples, we singled out ideal additives. They are (NH4)H2PO4, Al2(SO4)318H2O, CaSO4, CaO and CaCO3. According to XRD measurements, potassium in rice straw can be turned into high melting point of potassium in the form of K2CaP2O7 with (NH4)H2PO4 as additive. CaSO4 and Al2(SO4)318H2O can make potassium be fixed in the form of K2SO4. CaO and CaCO3 are not directly involved in the reaction with alkali metals, but can react to other elements in the system, which promotes potassium in the straw to be separated from bottom ash. The result shows that adding additives to straw is one of the effective ways to solve straw ash fusion problem caused by alkali metals.

引用

页码：1573 / 1578

页数：5

共 12 条

[1]

Ma X.-Q., Luo Z.-Y., Fang M.-X., Et al., Effect of additives on behavior of alkali metals during straw combustion, Journal of Zhejiang University: Engineering Science, 40, 4, pp. 599-604, (2006)

[2]

Ergudenler A., Ghaly A.E., Agglomeration of silica sand in a fluidized bed gasifier operating on wheat straw, Biomass Bioenergy, 4, 2, pp. 135-147, (1993)

[3]

Lin W.-G., Dam-Johansen K., Frandsen F., Agglomeration in bio-fuel fired fluidized bed combustors, Chemical Engineering Journal, 96, 1-3, pp. 171-185, (2003)

[4]

Nielsen H.P., Frandsen F.J., Dam-Johansen K., Et al., The implications of chlorine-associated corrosion on the operation of biomass-fired boilers, Progress in Energy and Combustion Science, 26, 3, pp. 283-298, (2000)

[5]

Lin W.-G., Krusholm G., Dam-Johansen K., Et al., Agglomeration phenomena in fluidized bed combustion of straw, 14th International Conference on Fluidized Bed Combustion, pp. 831-838, (1997)

[6]

Ma X.-Q., The study on the agglomeration in straw fired fluidized bed combustors, pp. 46-65, (2006)

[7]

Steenari B.M., Lindqvist O., High-temperature reactions of straw ash and the anti-sintering additives kaolin and dolomite, Biomass Bioenergy, 14, 1, pp. 67-76, (1998)

[8]

Vuthaluru H.B., Zhang D.-K., Effect of Ca-and Mg-bearing minerals on particle agglomeration defluidization during fluidized-bed combustion of a South Australian lignite, Fuel Processing Technology, 69, 1, pp. 13-27, (2001)

[9]

Reifenstein A.P., Kahraman H., Coinc D.A., Et al., Behavior of selected minerals in an improved ash fusion test: Quartz, potassium feldspar, sodium feldspar, kaolinite, illite, calcite, dolomite, siderite, pyrite and apatite, Fuel, 78, 12, pp. 1449-1461, (1999)

[10]

Ardersen K.H., Deposits formation during coal-straw co-combustion in a utility PF-boiler, (1998)

← 1 2 →