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（1）混燃发电模式 与煤相比，生物质灰分中碱金属（主要是K） 和碱土金属（主要是Ca） 含量很高。由于生物质灰分和普通粉煤灰的成分有显著的差异，因而在进行混合灰综合利用时需考虑混燃生物质后粉煤灰的特性变化。研究表明，与普通粉煤灰相比，利用混合灰生产混凝土时需要加更多的引气剂才能达到相同的抗冻性能，且随生物质配比的增加，所需引气剂的量也相应增加[ ]。 目前，飞灰在混凝土添加剂使用标准，排除了任何非粉煤灰的来源。在现有的条件下，混燃电厂产生的混合飞灰难以进行生物质灰与粉煤灰的分离，一般用于制节能砖、铺路的材料，没有能够作为混凝土添加剂而得到高附加值的利用。电厂一般通过整体外包的方式出售给开发商，获利甚微。 （2）气化发电模式 兴化中科生物质气化发电案例，生物质气化后产生的飞灰量较小，而且通过水洗的方式除灰，飞灰由产生的废水经处理后带出，使得综合利用困难。湿灰和气化炉的底渣一般作埋田处理。 （3）直燃发电模式 秸秆直接燃烧产生的纯生物质飞灰与底渣，富含钾K、钠Na等元素，从理论上分析是很好的肥料原料。但是实际上，江苏省的秸秆直燃发电案例所采用的秸秆等生物质燃料种类非常多，各种燃料之间的属性差异很大（如稻草等草本类燃料的氯、碱金属含量高，树枝等木本类燃料的氯、碱金属含量相对较低），使得产生的灰成分复杂，不适宜直接将其作为化肥厂的原料。 因此，目前直燃电厂的飞灰以及底渣以半卖半送的方式出售。 [ Last edited by panpan429 on 2009-6-3 at 16:01 ] |
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panpan429(金币+27,VIP+0):谢谢帮助 6-4 09:08
panpan429(金币+27,VIP+0):谢谢帮助 6-4 09:08
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(1) Mode of power generation from mixed fuel Compared with coal, the content of both alkali metal (K as main component) and alkaline earth metals (Ca as main component) in biomass ash was very high. Because the significant differences existed between biomass ash and common fly ash, therefore characteristics of fly ash mixed with biomass should be took into consideration corresponding to comprehensive utilization of mixed ash. The research indicated that, compared with common fly ash, much more air-entraining agent should be used for the same freezing resistance corresponding to concrete production with the use of mixed ash, and the required amount of air-entraining agent increased with the increase in biomass ratio []. At present, according to concrete additive application standards for fly ash, only fly ash could be used. In the present conditions, the separation between biomass ash and fly ash derived from mixed fly ash of power plants was difficult to be performed, therefore, the mixed fly ash was generally used for energy-saving bricks and paving materials but not for concrete additives with high added value. Power plants, it was generally sold to the developer whole outsourcing method and little profit was attained. (2) Mode of power generation by gasification In the case of power generation by biomass gasification of Xinghuazhongke, little amount of fly ash could be produced after gasification of biomass and was removed by washing with water, and fly as was washed out by produced waste water which made comprehensive utilization became more difficult. (3) Mode of power generation by direct burning The pure biomass and bottom ash derived from direct burning of straw was abundant in K and Na and could be used for fertilizer material theoretically. But in fact, in the case of power generation by direct burning of straw in Jiangxi Province, a great many kinds of biomass material such as straw and so on was used and significant differences existed among these fuel (for example, herbage fuel such as straw contained high amount of chlorine and alkali metals, but woody fuel such as branch contained lower amount of chlorine and alkali metals comparatively.), so ash component was unadaptable for fertilizer material due to its complex ingredients. Therefore, at present, fly ash and bottom ash of direct burning power plants was sold by Semi-selling semi-sending method. |
2楼2009-06-03 22:51:02
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panpan429(金币+3,VIP+0):谢谢帮助 6-4 09:08
panpan429(金币+3,VIP+0):谢谢帮助 6-4 09:08
|
（1） 混燃发电模式 与煤相比，生物质灰分中碱金属（主要是K） 和碱土金属（主要是Ca） 含量很高。由于生物质灰分和普通粉煤灰的成分有显著的差异，因而在进行混合灰综合利用时需考虑混燃生物质后粉煤灰的特性变化。研究表明，与普通粉煤灰相比，利用混合灰生产混凝土时需要加更多的引气剂才能达到相同的抗冻性能，且随生物质配比的增加，所需引气剂的量也相应增加[ ]。 mixed fuel power generation mode Compared with coal, the content of alkali metals (mainly K) and alkaline earth metals(mainly Ca) in biomass ash is very high. As biomass ash and ordinary fly ash have composition of significant differences, change of the characteristics of fly ash after mixing biomass fuel should be considered during the comprehensive utilization of mixed ash. Studies have shown that compared with ordinary fly ash, more air-entraining agent is added to achieve the same antifreezing performance when using mixed ash to produce concrete. And the required amount of air-entraining agent increases with the increasing of the biomass ratio. 我刚翻译一段，发现jiaql已经翻译完了，剩下的我就不翻了 |
3楼2009-06-03 23:15:11
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4楼2009-06-04 00:11:40