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助熔劑對生物質(zhì)灰熔點(diǎn)和半焦氣化的影響分析
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    摘要:

    為了滿足生物質(zhì)氣流床氣化液態(tài)排渣的要求,研究了CaO與Fe2O3作為助熔劑對高灰熔點(diǎn)生物質(zhì)的助熔效果,并考察了其對生物質(zhì)半焦氣化的影響。結(jié)果表明:當(dāng)助熔劑CaO質(zhì)量分?jǐn)?shù)介于0.3~0.4之間時(shí),稻殼灰熔點(diǎn)有明顯的降低;當(dāng)助熔劑Fe2O3質(zhì)量分?jǐn)?shù)在0~0.5之間并逐漸增大時(shí),稻殼灰熔點(diǎn)急劇下降。CaO與Fe2O3在質(zhì)量分?jǐn)?shù)較低時(shí)對半焦氣化都有一定的催化作用,能夠提高碳轉(zhuǎn)化速率,但是隨著質(zhì)量分?jǐn)?shù)的增加,助熔劑附著在多孔半焦的表面,阻礙氣化介質(zhì)與半焦的接觸,使氣化效果下降。

    Abstract:

    With the aim to ensure biomass entrained-flow gasification in a slagging gasifier, the characteristics of biomass fusing ash using CaO and Fe2O3 as fusing agent were investigated respectively by experiments. Subsequently, the influence of fusing agent on the gasification reactivity of biomass chars was studied. The results indicate that when the weight percent of CaO is 0.3~0.4, the melting point drops down apparently; when the weight percent of CaO is higher than 0.4, the melting point increases. While the addition of Fe2O3 increases at 0~0.5, the melting point decreases sharply. When the amounts of CaO and Fe2O3 are low, they can promote the reaction rate of char gasification. However, as the amounts of two additives increase, the fusing agents attach on the porous surface of chars and prevent the gas from the surface of chars, so the gasification reactivity decreases.

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趙輝,韓樹新,盛水平,周勁松,駱仲泱,岑可法.助熔劑對生物質(zhì)灰熔點(diǎn)和半焦氣化的影響分析[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2008,39(11):42-47.[J]. Transactions of the Chinese Society for Agricultural Machinery,2008,39(11):42-47.

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