CN103131498B - 一种热压塑化成型秸秆炭及其制造方法 - Google Patents
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Abstract
一种热压塑化成型秸秆炭,为秸秆和造纸制浆黑液二组分物料混合后模压成型再炭化而得,其意义不光在于制浆造纸中产生的大量木质素资源可以得到充分利用,减轻环境治理的压力,而且在于大量废弃秸秆资源可以得到充分利用,如果将我国被烧掉的秸秆能量用来发电,年发电量将达5000亿KWh以上;另外农民起码会从中受益,一是在经济方面,再则,如以炭来发电,废渣将是农田改良的极佳选择;本发明更深的意义还在于将太阳能以炭的形式被储存和利用,并且方便易行,可以实现大气CO2的迁移,应对气候变暖,也为能源可持续提供一途径。
Description
【技术领域】
本发明涉及一种炭的制造技术和黑液治理领域。
【背景技术】
秸秆通常是指小麦、水稻、玉米、薯类、油料、棉花、甘蔗和其它农作物在收获籽实后的剩余部分。农作物光合作用的产物有一半以上存在于秸秆中,秸秆是一种具有多用途的可再生的生物资源。
据有关统计,中国每年在农作物秸秆利用方面包括其中用于畜牧饲料为1.45亿t,还田肥料0.91亿t,工业原料0.14亿t,作为农民传统的生活燃料的秸秆为2.8亿t,分别占总量的24%、15%、2.3%和40%,除了上述用途外,还有18.7%约1.13亿t剩余秸秆没有任何用途,成为真正的废弃物,大部分在田野焚烧了,这不仅严重污染环境,影响交通,而且造成生物质能源的极大浪费,秸秆的利用水平有待进一步提高。
在现有技术秸秆的生物质能源利用中,生物质热化学转化利用是最主要的选项。秸秆的热解利用包括秸秆的气化、干馏、液化和炭化,秸秆气化是指在有氧气助燃的情况下在煤气发生炉里将秸秆转化为可燃性气体,秸秆干馏是指秸秆在干馏釜中隔绝空气热解加工成初级液体产品,而液化则是将其进一步在高温和催化剂等条件的共同作用下转化为液体燃料。秸秆的热解技术是个成熟的技术,但是不被广泛利用,原因主要在于木本类植物资源比它更具价值,相对而言由于其本身热值低、灰分高,所以在产量、质量、生产成本上不具优势,缺少商品化竞争条件。
在现有技术秸秆的生物质能源利用中,也有将秸秆作为机制炭原料的,由于秸秆相对柔软不具脆性,存在粉碎难问题、往往需要几次粉碎,能耗和用工提高了制造成本,秸秆属草本植物,木质素含量相对少,制棒机械对秸秆粉碎料技术要求高,在炭化过程中易碎等缺陷,很少被利用。
在现有技术秸秆的生物质能源利用中,用秸秆直接燃烧供热发电的利用方式,是一条将秸秆转化为生物质能源的工艺技术路线。生物质的热解气化与燃气轮机结合的联合循环发电系统(IGCC)将生物质转换成电能和热能的利用,大大提高了发电效率并降低污染。生物质IGCC技术被认为是目前世界上最先进的生物质气化发电技术。但是存在以下技术缺陷:高温燃气中含有的碱金属及其他有害微量元素对燃气轮机的叶片及系统其它设备的腐蚀极大,并且导致沉积的形成、阻碍热交换,降低换热效率,从而降低发电效率和功率,阻塞流道,造成机械损害,运行故障。
制浆造纸的主要技术就是脱除木质纤维中的木质素,其主要的副产物黑液由于其结构复杂,生物降解难,是造纸工业主要的有机污染物,若不充分利用,流入江河湖泊,造成严重的环境污染及大量的资源浪费。在我国每年制浆造纸可利用的木质素有1000多万吨,过去大部分随造纸废水排放污染环境,现在绝大部分是被燃烧处理,大量的木质素资源有待开发利用。
【发明内容】
本发明的目的在于克服以上现有技术的不足,解决秸秆生物质资源不能被大规模利用问题、秸秆制炭存在的质量产量规模化问题、在制浆造纸造成环境污染和大量的木质素资源浪费问题以及秸秆生物质资源被发电存在的设备腐蚀损害等问题,提供了一种炭即热压塑化成型秸秆炭,其充分利用了农田废弃秸秆生物质资源和制浆造纸的副产物木质素资源,改变现有技术中炭的制造工艺以及黑液的治理模式,产品得炭率高、固定炭含量高,灰分低,并且成本低廉,可以提供生物质能源发电,对设备的腐蚀甚微;本发明的另一目的是,提供一种工艺合理,生产效率高,能耗低,产品质量好,规模化生产的热压塑化成型秸秆炭的制造方法。
为了达到上述目的,本发明采用的技术方案是:
一种热压塑化成型秸秆炭,其特征在于,所述的热压塑化成型秸秆炭原料为秸秆和造纸制浆黑液,经二组分物料混合后模压成型再炭化而得。特征在于,浸渍工序是将自然风干的秸秆不需经过粉碎放置黑液池中与黑液混合,秸秆可在农田里自然日晒风干,生产用的秸秆不需产生能耗,也不需将其粉碎,只需将其放置黑液池中与黑液混合即可;析出工序是往池中注入秸秆燃烧的烟气,液体中沉淀物析出粘附在池中秸秆物料表面,碱木质素黑液可以酸析,秸秆燃烧的烟气主要是CO、CO2,通过在封闭室内吸氧燃烧,由解除冷却系统的空气压缩机吸入,注入黑液池底部即可,秸秆浸入黑液发生中和反应,如需加快,还可以往池里适当加草酸;干燥工序是将物料取出后叠放堆置致使物料风干;热压塑化成型工序是将以上风干物料按分量铺装进入热压机受5~20MPa压强的力作用,同时温度控制在120~190℃,塑化时间为1~4小时,完成热压塑化工艺,成型后使物料密度达0.9~1.4g/cm3,出料后经锯切成要求规格堆叠进入炭化炉窑炭化,完全炭化后冷却即成热压塑化成型秸秆炭。
本发明的积极效果是:
(1)制浆造纸中产生的大量木质素资源可以得到充分利用,减轻环境治理的压力。
(2)大量废弃秸秆资源可以得到充分利用,如果将我国被烧掉的秸秆能量用来发电,年发电量将达5000亿KWh以上。
(3)农民起码会从中受益,一在经济方面,再则,如以炭来发电,废渣将是农田改良的极佳选择。
(4)将太阳能以炭的形式被储存和利用,并且方便易行,可以实现大气CO2的迁移,应对气候变暖,也为能源可持续提供一途径。
【具体实施方式】
以下提供本发明黑液秸秆炭具体的实施方式。但本发明不限于以下实施例。
实施例
先往黑液池底高5cm处预先铺入一张与池底面积相当的竹笆,竹笆四角和四边都有绳子一头系住,另一头露在池外,方便起拉作业,池底留5cm高度给烟气管排气用,此时可开始作业;将含水率在8%左右的稻草一把把往池里扔,以稻草吸湿后沉入池底为宜,可人工用竹竿扶助下沉,扔满后以稻草全部淹入液中为适宜,完成浸渍工序;稻草在池中浸渍3天,不断排入秸秆燃烧烟气,用行车吊起置陈放叠放,让其自然风干;将干燥好物料每等份160Kg称重置框式料斗铺装组胚进入热压机,在最高5MPa压强和155℃温度条件下成型规格为2400mm*1200mm*50mm半成品;出料后经锯切成要求规格堆叠进入炭化炉窑炭化,完全炭化后冷却即成热压塑化成型秸秆炭。
Claims (1)
1.一种热压塑化成型秸秆炭的制造方法,包含以下生产工序:(1)浸渍(2)析出(3)干燥(4)热压塑化成型(5)锯切(6)炭化,其特征在于,浸渍工序是将自然风干的秸秆不需经过粉碎放置黑液池中与黑液混合,析出工序是在池中注入秸秆燃烧的烟气或加草酸,液体中沉淀物析出粘附在池中秸秆物料表面,干燥工序是将物料取出后叠放堆置致使物料风干,热压塑化成型工序是将以上风干物料按分量铺装进入热压机受5~20MPa压强的力作用,同时温度控制在120~190℃,塑化时间为1~4小时,完成热压塑化工艺,成型后使物料密度达0.9~1.4g/cm3,出料后经锯切成要求规格堆叠进入炭化炉窑炭化,完全炭化后冷却即成热压塑化成型秸秆炭。
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