猪粪干发酵出料流动性的研究

发布时间：2018-08-18 09:45

【摘要】：物料流动性是影响猪粪干式沼气发酵的重要因素,文章采用流速表征物料的流动性,参考污泥输送流速,并模拟生产规模干式沼气发酵工程,确定猪粪干发酵物料流动的临界流速为6 mm·s~(-1)。以猪粪干式沼气发酵残余物为对象,研究了发酵残余物总固体(TS)含量、出料管管径、出料管进出口高度差对发酵残余物物料流动性的影响。物料下降过程平均流速测试结果表明,TS含量越小,管径越大,高度差越大,流动性越好。TS 18%和TS 19%的物料,在管径75~150 mm的出料管中,在高度差100~800 mm下,都具有流动性。TS 20%的物料,在管径125~150 mm的出料管中,在高度差达到100 mm时,具有流动性;在管径75~100 mm的出料管中,只有在高度差达到300 mm时,才具有流动性。TS 21%的物料,在管径150,125,100,75 mm的出料管中,只有高度差分别达到300,400,600,800 mm时,才具有流动性。TS 22%的物料,在管径75~125 mm的出料管中,在高度差100~800 mm下,都没有流动性;在管径150 mm的出料管中,只有在高度差达到600 mm时,才具有流动性。
[Abstract]:The material fluidity is an important factor affecting the dry biogas fermentation of pig manure. The flow rate of the material is characterized by the velocity of flow, the flow rate of sludge is referred to, and the dry biogas fermentation project of production scale is simulated. The critical flow rate of pig manure dry fermentation material was determined to be 6 mm s ~ (-1). The effects of total solid (TS) content of fermentation residue, diameter of discharge tube and height difference of inlet and outlet of discharge tube on material fluidity of fermentation residue were studied with pig manure dry biogas fermentation residue as an object. The results of the average flow rate test during the process of material descent show that the smaller the content of TS, the bigger the diameter, the greater the height difference, the better the fluidity of the material, the better the flowability. In the discharge pipe with 75 ~ 150 mm diameter, the height difference is 100 ~ 800 mm. In the discharge pipes with a diameter of 125 ~ 150 mm, when the height difference is up to 100 mm, and in a discharge pipe with a diameter of 75 ~ 100 mm, only when the height difference reaches 300 mm, the material with a fluidity of .TS 21% can be obtained. Only when the height difference reaches 300400,600,800 mm in the discharge pipe with a diameter of 150 ~ 125m ~ (125) / 100 ~ (75) mm is the material with a fluidity of .TS 22%. In a discharge pipe with a diameter of 75 ~ 125 mm, there is no fluidity at 100 ~ 800 mm in height difference, and in a discharge pipe with a diameter of 150 mm, there is no fluidity in the discharge pipe with a diameter of 150 mm. Liquidity is available only when the height difference reaches 600 mm.
【作者单位】：农业部沼气科学研究所;
【基金】：国家自然科学基金(31572450) 国家生猪技术产业体系(CARS-36-10B)
【分类号】：S216.4;X713

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