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首页> 外文会议>American Society of Agricultural and Biological Engineers Annual International Meeting >Effects of pressure on the torrefaction process using self-heating of dairy manure
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Effects of pressure on the torrefaction process using self-heating of dairy manure

机译：用乳品粪肥自加热对烘焙过程压力的影响

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摘要

To reduce the energy consumption of torrefaction, a torrefaction process employing self-heating of cattle manure was considered. We investigated the effects of ambient pressure on (i) the initiating temperature causing self-heating of wet cattle manure and (ii) the fuel properties of torrefied manure prepared at 250 °C. The results showed that the initiating temperature decreased from 160 to 95 °C when the pressure was elevated from 0.1 to 1.0 MPa. Also, self-heating of dry manure was induced at 125 °C and 1.0 MPa, suggesting that self-heating was promoted not only by pressurization but also by free water in the material. Fuel properties of the torrefied manure were also affected by the ambient pressure. With the increase ofpressure, mass and energy yields, and elemental O content of the products were decreased, whereas ash and elemental C contents were increased. The elemental composition of the manure was altered to that ofpeat at 0.1 MPa and that of lignite at 0.4 to 1.0 MPa. As for calorificvalue, the higher hearing value on a dry basis showed a decreasing trend due to the increase in ash content, while that on a dry and ash-free basis increased as the pressure increased.
机译：为了减少烘焙的能量消耗，考虑了采用牛粪自加热的烘焙过程。我们调查了环境压力对（i）湿牛粪的自加热的启动温度的影响，（ii）在250℃下制备的雾化粪堆的燃料特性。结果表明，当压力升高0.1至1.0MPa时，启动温度从160℃降低到95℃。此外，在125℃和1.0MPa诱导干燥粪肥的自加热，表明不仅通过加压而且通过材料中的游离水而促进自加热。烘焙粪肥的燃料特性也受到环境压力的影响。随着压抑，质量和能量产量的增加，产物的元素o含量降低，而灰分和元素C含量增加。粪肥的元素组成被改变为0.1MPa的琥珀色，褐煤在0.4-1.0MPa的情况下改变。至于热量值，干基的听力值较高，由于灰分含量的增加，由于灰分含量的增加，随着压力的增加而增加，在干燥和无灰的基础上增加。

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