南疆棉秆能源炭制备及其燃烧特性研究
发布时间：2019-05-13 23:18
【摘要】：南疆棉秆资源丰富,但是利用率很低。合理高效的利用棉秆资源对南疆的发展会带来动力,对降低大气污染也有积极的作用。本文首先阐述了合理利用南疆棉秆的目的和意义,然后对生物质利用现状进行了介绍。本文以南疆棉秆作为研究对象,利用智能马弗炉对其进行热解炭化,找出了最优的制备棉秆能源炭的工艺参数组合。本文主要研究内容和结论如下:(1)秆的水分由刚收集的41.84%下降到一个月以后的11.46%,下降十分的非常明显,但一个月以后水分下降趋于平缓,基本不再减少。挥发分的含量由刚开始的22.95%上升到一个月以后的52.87%,挥发分上升的非常明显,但一个月后挥发分的增加趋于平缓。固定碳与灰分的含量基本不受时间变化。影响得炭率的各因素主次顺序为热解终温、升温速率、保温时间。最优组合为热解终温400℃,升温速率8℃/min,保温时间1h。为验证优选的工艺参数,按最优组合热解炭化棉秆粉末,得炭率为36.14%。(2)随着压强逐渐增大,压缩成型的棉秆炭、棉秆粉末的密度逐渐增大,在压缩强度30MPa之后基本趋于平缓。(3)不同热解参数下制得的棉秆能源炭水分的失重峰温度范围为62~82℃。不同热解参数下制得的棉秆能源炭燃烧过程中失重峰值也都不相同,温度最低出现在热解终温300℃、保温时间3h制得的棉秆能源炭失重最为明显的温度为454℃,温度最高出现在500℃热解终温、保温时间4h制得的棉秆能源炭失重最为明显的温度为1028℃。棉秆炭燃烧过程中,挥发分析出与固定碳燃烧温度区间有相互重叠区间,棉杆炭燃烧由挥发分燃烧和固定碳燃烧组成。(4)不同条件下制得的棉秆能源炭的着火温度存在差异。着火温度范围为175~228℃。着火点温度最低的是在热解终温为300℃、保温时间为1h条件下制得的棉秆能源炭,着火点温度最高的是在热解终温为600℃、保温时间为3h条件下制得的棉秆能源炭。燃尽温度的范围为1020℃至1488℃。燃尽温度最低的是在热解终温600℃、保温时间为4h条件下制得的棉秆能源炭,燃尽温度最高的是在热解终温600℃、保温时间为1h条件下制得的棉秆能源炭。
[Abstract]:Southern Xinjiang is rich in cotton stalk resources, but the utilization rate is very low. Rational and efficient utilization of cotton stalk resources will bring impetus to the development of southern Xinjiang, and also play a positive role in reducing air pollution. This paper first expounds the purpose and significance of rational utilization of cotton stalks in southern Xinjiang, and then introduces the present situation of biomass utilization. In this paper, the cotton stalk in southern Xinjiang was pyrolysis and carbonified by intelligent muffle furnace, and the optimal process parameter combination for preparing cotton stalk energy carbon was found out. The main contents and conclusions of this paper are as follows: (1) the moisture of culm decreased from 41.84% to 11.46% after one month, but after one month, the decrease of moisture tended to be gentle and almost no longer decreased. The content of volatile matter increased from 22.95% at the beginning to 52.87% after one month, and the content of volatile matter increased very obviously, but the increase of volatile matter tended to be gentle after one month. The contents of fixed carbon and ash are basically unchanged from time to time. The primary and secondary order of the factors affecting the carbon yield is final pyrolysis temperature, heating rate and holding time. The optimum combination is the final pyrolysis temperature of 400 鈩，
本文编号：2476257
[Abstract]:Southern Xinjiang is rich in cotton stalk resources, but the utilization rate is very low. Rational and efficient utilization of cotton stalk resources will bring impetus to the development of southern Xinjiang, and also play a positive role in reducing air pollution. This paper first expounds the purpose and significance of rational utilization of cotton stalks in southern Xinjiang, and then introduces the present situation of biomass utilization. In this paper, the cotton stalk in southern Xinjiang was pyrolysis and carbonified by intelligent muffle furnace, and the optimal process parameter combination for preparing cotton stalk energy carbon was found out. The main contents and conclusions of this paper are as follows: (1) the moisture of culm decreased from 41.84% to 11.46% after one month, but after one month, the decrease of moisture tended to be gentle and almost no longer decreased. The content of volatile matter increased from 22.95% at the beginning to 52.87% after one month, and the content of volatile matter increased very obviously, but the increase of volatile matter tended to be gentle after one month. The contents of fixed carbon and ash are basically unchanged from time to time. The primary and secondary order of the factors affecting the carbon yield is final pyrolysis temperature, heating rate and holding time. The optimum combination is the final pyrolysis temperature of 400 鈩，
本文编号：2476257
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