CN107880913A - 一种沼渣机制炭及其制备方法 - Google Patents
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Abstract
本发明提供了一种沼渣机制炭及其制备方法,包括以下步骤:(1)将沼渣沼液干湿分离;(2)平铺摊开,自然风干;(3)将木材加工剩余物进行粉碎,得到粉碎木屑;(4)将风干沼渣、木屑搅拌均匀,得到混合物料;(5)将混合物料烘干;(6)将烘干后的混合物料挤压成型,得到成型棒状带孔物料;(7)将棒状带孔物料行炭化,在缺氧条件下,自然降温冷却,得到机制炭。本发明有效利用沼渣降低了达到机制炭松弛密度标准时所需的成型压力,降低成型能耗,减少设备磨损,同时碳化温度低,炭化时间短,生产成本低,且生产的机制炭性能好,燃烧稳定。
Description
技术领域
本发明涉及机制炭技术领域,具体是一种沼渣机制炭及其制备方法。
背景技术
随着秸秆综合利用的不断发展,厌氧发酵逐渐成为一种环保而且高效的利用方式。在秸秆厌氧发酵过程中,沼液沼渣的处理是非常重要的问题。沼渣中拥有植物生长所必须的各种营养元素以及腐植酸等,是良好的有机肥生产原料。然而,农民对于有机肥的接受程度不高,“重化肥轻有机肥”是中国农业生产的现状问题之一,沼渣有机肥是企业营收的重要部分,同时有机肥的生产线投入较高,这些导致厌氧发酵企业销售难度大,容易亏损,进一步造成对秸秆的利用不完全。
机制炭成型设备的快速磨损问题是增加成本的重要问题。机制炭的成型需要对其施加很高的压力,一般为10~30MPa,有时甚至高达100MPa,由此产生的高摩擦力是导致制棒机部件快速磨损的主要原因。成型过程中原料颗粒在压力作用下通过固体架桥、机械镶嵌和分子间力形成致密的颗粒或块状燃料。这些作用的发挥主要受纤维素、半纤维素和木质素的物理和化学特性的影响。因此,通过预处理改变原料的物化特性成为降低成型压力及提高成型燃料机械耐久性的重要手段。
目前的机制炭大部分利用农林废弃物加工粉碎后与木屑、竹屑或者果壳屑以一定比例混合制造。秸秆类材料含大量纤维素和一定数量的矿物质,其中纤维素的构件分子含较多羟基,每个分子中碳原子只能通过羟基提供形成氢键的氢原子而与水分子结合,不仅导致在加热过程中烘干、脱水、粘结的时间长,而且弹性较高难以被压缩,导致碳棒疏松、散碎炭较多,成型率较低,热值低,燃烧时间较短,水分、挥发分、灰分也较大,从而降低产品等级。所以,为了达到机制炭等级要求,秸秆的添加量通常较少。
发明内容
本发明的目的在于提供一种沼渣机制炭及其制备方法,以解决上述背景技术存在的问题。
本发明的技术方案是这样实现的:
一种沼渣机制炭及其制备方法,包括以下步骤:
(1)将沼渣沼液通过固液分离机进行干湿分离,得到含水率为50%~60%沼渣;
(2)将步骤(1)中沼渣平铺摊开,自然风干至含水率20%~25%;
(3)将木材加工剩余物进行粉碎,得到粉碎木屑;
(4)将步骤(2)风干沼渣、步骤(3)木屑按质量百分数:风干沼渣45%~55%、木屑45%~55%加入到搅拌机中搅拌均匀,得到混合物料;
(5)将步骤(4)混合物料送入滚筒烘干机进行烘干;
(6)将步骤(5)烘干后的混合物料送入制棒机挤压成型,得到成型棒状带孔物料;
(7)将步骤(6)棒状带孔物料送入炭化炉进行炭化,在缺氧条件下,自然降温冷却,得到机制炭。
进一步地,所述步骤(1)沼渣沼液为玉米秸秆沼气发酵后的残留物。
进一步地,所述步骤(3)木材加工剩余物为锯末、刨花、边皮和截头,粉碎细度为-50目100%。
进一步地,所述步骤(5)烘干温度80℃~100℃,时间1h~2h,烘干后混合物料含水率6%~10%。
进一步地,所述步骤(6)制棒机为螺旋进给式制棒机,压强为5~10MPa,温度100℃~150℃。
进一步地,所述步骤(7)炭化温度500℃~600℃,炭化时间4h~6h。
本发明的有益效果为:
本发明有效利用沼渣降低了达到机制炭松弛密度标准时所需的成型压力,降低成型能耗,减少设备磨损,同时碳化温度低,炭化时间短,生产成本低,且生产的机制炭性能好,燃烧稳定。
具体实施方式
下面将结合实施例对本发明技术方案进行清楚、完整地描述,显然,所描述地实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例1
一种沼渣机制炭及其制备方法,包括以下步骤:
(1)将沼渣沼液通过固液分离机进行干湿分离,得到含水率为60%沼渣;
(2)将步骤(1)中沼渣平铺摊开,自然风干至含水率25%;
(3)将木材加工剩余物进行粉碎,得到粉碎木屑;
(4)将步骤(2)风干沼渣、步骤(3)木屑按质量百分数:风干沼渣55%、木屑45%加入到搅拌机中搅拌均匀,得到混合物料;
(5)将步骤(4)混合物料送入滚筒烘干机进行烘干,烘干温度100℃,时间1h;
(6)将步骤(5)烘干后的混合物料送入制棒机挤压成型,压强为10MPa,温度150℃,得到成型棒状带孔物料;
(7)将步骤(6)棒状带孔物料送入炭化炉进行炭化,炭化温度600℃,炭化时间4h,在缺氧条件下,自然降温冷却,得到机制炭。
实施例2
一种沼渣机制炭及其制备方法,包括以下步骤:
((1)将沼渣沼液通过固液分离机进行干湿分离,得到含水率为55%沼渣;
(2)将步骤(1)中沼渣平铺摊开,自然风干至含水率22%;
(3)将木材加工剩余物进行粉碎,得到粉碎木屑;
(4)将步骤(2)风干沼渣、步骤(3)木屑按质量百分数:风干沼渣50%、木屑50%加入到搅拌机中搅拌均匀,得到混合物料;
(5)将步骤(4)混合物料送入滚筒烘干机进行烘干,烘干温度90℃,时间1.5h;
(6)将步骤(5)烘干后的混合物料送入制棒机挤压成型,压强为7MPa,温度120℃,得到成型棒状带孔物料;
(7)将步骤(6)棒状带孔物料送入炭化炉进行炭化,炭化温度550℃,炭化时间5h,在缺氧条件下,自然降温冷却,得到机制炭。
实施例3
一种沼渣机制炭及其制备方法,包括以下步骤:
(1)将沼渣沼液通过固液分离机进行干湿分离,得到含水率为50%沼渣;
(2)将步骤(1)中沼渣平铺摊开,自然风干至含水率20%;
(3)将木材加工剩余物进行粉碎,得到粉碎木屑;
(4)将步骤(2)风干沼渣、步骤(3)木屑按质量百分数:风干沼渣45%、木屑55%加入到搅拌机中搅拌均匀,得到混合物料;
(5)将步骤(4)混合物料送入滚筒烘干机进行烘干,烘干温度80℃,时间2h;
(6)将步骤(5)烘干后的混合物料送入制棒机挤压成型,压强为5MPa,温度100℃,得到成型棒状带孔物料;
(7)将步骤(6)棒状带孔物料送入炭化炉进行炭化,炭化温度500℃,炭化时间6h,在缺氧条件下,自然降温冷却,得到机制炭。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (6)
1.一种沼渣机制炭及其制备方法,包括以下步骤:
(1)将沼渣沼液通过固液分离机进行干湿分离,得到含水率为50%~60%沼渣;
(2)将步骤(1)中沼渣平铺摊开,自然风干至含水率20%~25%;
(3)将木材加工剩余物进行粉碎,得到粉碎木屑;
(4)将步骤(2)风干沼渣、步骤(3)木屑按质量百分数:风干沼渣45%~55%、木屑45%~55%加入到搅拌机中搅拌均匀,得到混合物料;
(5)将步骤(4)混合物料送入滚筒烘干机进行烘干;
(6)将步骤(5)烘干后的混合物料送入制棒机挤压成型,得到成型棒状带孔物料;
(7)将步骤(6)棒状带孔物料送入炭化炉进行炭化,在缺氧条件下,自然降温冷却,得到机制炭。
2.根据权利要求1所述的一种沼渣机制炭及其制备方法,其特征在于,所述步骤(1)沼渣沼液为玉米秸秆沼气发酵后的残留物。
3.根据权利要求1所述的一种沼渣机制炭及其制备方法,其特征在于,所述步骤(3)木材加工剩余物为锯末、刨花、边皮和截头,粉碎细度为-50目100%。
4.根据权利要求1所述的一种沼渣机制炭及其制备方法,其特征在于,所述步骤(5)烘干温度80℃~100℃,时间1h~2h,烘干后混合物料含水率6%~10%。
5.根据权利要求1所述的一种沼渣机制炭及其制备方法,其特征在于,所述步骤(6)制棒机为螺旋进给式制棒机,压强为5~10MPa,温度100℃~150℃。
6.根据权利要求1所述的一种沼渣机制炭及其制备方法,其特征在于,所述步骤(7)炭化温度500℃~600℃,炭化时间4h~6h。
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CN110257123B (zh) * | 2019-07-04 | 2020-07-03 | 杭州万知科技有限公司 | 一种生物质燃料制备方法 |
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