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rice hull
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  rice hull
Hydrothermal synthesis of cements from rice hull ash
      
Thermal plasma synthesis of SiC from rice hull (husk)
      
This paper focuses on the application of silica rich, rice hull ash (RHA) from the rice industry as filler in polypropylene (PP).
      
Effect of coupling agents on the crystallinity and viscoelastic properties of composites of rice hull ash-filled polypropylene
      
This work describes the utilization of rice hull as raw-material for the preparation of two calcium silicates namely, β-Ca1.91Ba0.04SiO4 and β-Ca1.96Ba0.04SiO4.
      
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Employing slagging index \$t\-2、B/A、S/A、G, \$fouling index Hw and abrasiveness index HM, this paper analyzes the slagging, fouling, abrasiveness performances of low\|temperature pyrolyzed biomass and co\|firing it with coal. It suggests: (1) Three kinds of low\|temperature pyrolyzed biomass (sawdust, rice hull and peanut shell) are not appropriate for direct combustion in the boiler of power plant. (2) The slagging, fouling and abrasiveness performances of co-firing low-temperature pyrolyzed biomass with...

Employing slagging index \$t\-2、B/A、S/A、G, \$fouling index Hw and abrasiveness index HM, this paper analyzes the slagging, fouling, abrasiveness performances of low\|temperature pyrolyzed biomass and co\|firing it with coal. It suggests: (1) Three kinds of low\|temperature pyrolyzed biomass (sawdust, rice hull and peanut shell) are not appropriate for direct combustion in the boiler of power plant. (2) The slagging, fouling and abrasiveness performances of co-firing low-temperature pyrolyzed biomass with coal depend on the ash content, the ash component of them and their blending rate, etc. (3) Co\|firing the three pyrolyzed biomass with coal will improve the performance of the pyrolyzed biomass in slagging, fouling and abrasiveness but will deteriorate the coal's performance in these aspects. (4) The coal will reveal a better performance in slagging and fouling and be propitious to increase co\|firing proportion, if lower content of pyrolyzed biomass ash and higher content of coal ash are availed. (5) Comparing the three pyrolyzed biomass, due to its low ash content, pyrolyzed sawdust has the best mixability with coal and the blending rate with the two coal samples can reach 3∶7 without serious slagging and fouling problem; blending pyrolyzed rice hull with the two coal samples will reduce the rice hull's abrasiveness but lead to serious slagging trend; pyrolyzed peanut shell has a good mixability with long flame coal because the ash content of the latter outweighs that of the former; when blended with anthracite, the blend will reveal a serious fouling trend for their approximate ash contents.

利用灰分的结渣性指数 t2 、B/A、S/A、G ,积灰沾污特性指数Hw 和磨损指数HM 对低温热解生物质单燃和与煤共燃时的结渣、积灰和磨损特性进行了研究和分析。认为 :(1 )低温热解生物质 (锯屑、谷壳和花生壳 )都不适合在电厂锅炉中直接燃烧。(2 )热解生物质与煤共燃时的结渣、积灰和磨损特性取决于热解生物质灰分含量、灰成分 ,煤的灰分含量、灰成分以及混合比例等因素。(3)三种热解生物质与煤共燃能够改善它们的结渣、积灰沾污和磨损性能 ,但又增加了煤的结渣、积灰沾污和磨损性。(4 )热解生物质灰分含量越低 ,煤的灰分含量越高 ,煤的结渣、积灰沾污性能越好 ,越有利于提高混燃比例。(5 )三种热解生物质中 ,热解锯屑与煤可混性最好 ,其他两种则相对较差

Efficient conversion of straw materials for energy purpose has provided one ideal solution in wastes utilization and environment protection.The combustion characteristics of agricultural wastes in circulating fluid bed(CFB) were investigated with rice hull as the feedstock.On basis of long duration successive test with one pilot scale test facility,the effects of fluidizing velocity,particle size and air distribution on the combustion behavior were discussed in detail,as well as agglomeration phenomenon...

Efficient conversion of straw materials for energy purpose has provided one ideal solution in wastes utilization and environment protection.The combustion characteristics of agricultural wastes in circulating fluid bed(CFB) were investigated with rice hull as the feedstock.On basis of long duration successive test with one pilot scale test facility,the effects of fluidizing velocity,particle size and air distribution on the combustion behavior were discussed in detail,as well as agglomeration phenomenon in straw material combustion.The variation of fluidizing velocity was found to be proportional to the variation of combustion efficiency in certain ranges.However,particle size was inversely proportional to combustion efficiency.And it seemed that the best ratio of secondary air in total air output was 50~70 percent for steady CFB operation In order to avoid the high temperature agglomeration in combustion process of straw materials in CFB,the operation temperature should be kept at below 900 ℃,with relatively uniform temperature distribution in CFB reactor under 850 ℃.

生物质的燃烧利用已被人们所重视,大量的生物质秸秆更需要合理的利用,而对于生物质秸秆燃烧锅炉,目前研究则不多。通过一系列秸秆在循环流化床内的燃烧实验,从秸秆颗粒度、密度以及表面粗糙度等方面研究了对其燃烧工况的影响。结果表明,颗粒度大小影响秸秆挥发分的析出以及传热过程,密度大小影响到原料的循环以及传热系数,表面粗糙度直接影响到秸秆的辐射换热。与煤相比,秸秆有其自身的特点,故生物质秸秆的循环流化床燃烧应根据其特点进行设计。考虑到秸秆的具体特性,流化床炉膛燃烧温度控制在800 ̄900℃之间为宜。

In order to study the law of NO emissions from co-combustion of plastic powder and rice hull, the co-combustion experiments were performed in CFB designed by ourselves. The influences of combustion temperature, the ratio of plastic powder to rice hull and stoichiometric coefficient on the emission of NO were studied. Experimental research showed that NO emissions are increasing with the increase of temperature, NO emissions are decreasing with the increase of ratio of plastic powder to rice hull,...

In order to study the law of NO emissions from co-combustion of plastic powder and rice hull, the co-combustion experiments were performed in CFB designed by ourselves. The influences of combustion temperature, the ratio of plastic powder to rice hull and stoichiometric coefficient on the emission of NO were studied. Experimental research showed that NO emissions are increasing with the increase of temperature, NO emissions are decreasing with the increase of ratio of plastic powder to rice hull, and the NO emissions was lower when co-combustion than the weighted arithmetic mean of NO emissions when these two fuels combusted separately, NO emissions will be decreased with the increase of stoichiometric coefficient. In order to search the general law of NO emissions from co-combustion of plastic powder and rice hull, a predicting model of NO emissions based on radial basis function neural network was set up and the forecasted results showed that this model was accurate.

为研究塑料与稻壳共燃的氮氧化物生成规律,在自行设计的循环流化床装置上进行了二者的共燃实验。研究了温度、塑料粉和稻壳的混合比例及过量空气系数对NO生成量的影响。实验结果表明,随温度升高,NO生成量升高;随塑料粉与稻壳混合比例增加,NO生成量呈降低趋势,且NO的生成量低于二者单独焚烧时生成量的线性叠加;随着过量空气系数增加,NO生成量降低。为寻找二者共燃NO生成的一般性规律,采用径向基神经网络建立了NO生成的预测模型,预测结果显示该模型具有很高的精度。

 
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