CN110078330A - 一种寒冷地区富氧燃烧沼气发电工程系统 - Google Patents
一种寒冷地区富氧燃烧沼气发电工程系统 Download PDFInfo
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 48
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Abstract
本发明涉及一种寒冷地区富氧燃烧沼气发电工程系统,属于沼气发电技术领域。该寒冷地区富氧燃烧沼气发电工程系统包括沼气发酵系统、沼气供热保温系统、沼气净化与贮存系统、富氧沼气发电系统、脱硝系统和有机肥生产系统。该系统可以解决寒冷地区沼气发酵供热问题,该系统不仅可以有效脱出沼气中H2S,还可回收硫饼;采用富氧燃烧‑沼液脱硝技术强化沼气燃烧和微碱性沼液脱出富氧燃烧主要氮氧化物气体NO2;采用有机肥生产系统,脱硝后微酸性沼液浓缩制成叶面肥,沼渣通过进一步好氧发酵制成有机肥,提高收益。
Description
技术领域
本发明涉及一种寒冷地区富氧燃烧沼气发电工程系统,属于沼气发电技术领域。
背景技术
能源是人类社会存在与发展的物质基础。过去多年,建立在煤炭、石油、天然气等化石燃料基础上的能源体系极大的推动了人类社会的发展。然而,人们在物质生活和精神生活不断提高的同时,也越来越感悟到大规模使用化石燃料所带来的严重后果,资源日益枯竭,环境不断恶化,还诱发不少国与国之间、地区之间的政治经济纠纷,甚至冲突和战争。因此,人类必须寻求一种新的、清洁、安全、可靠的可持续能源系统。
生物质能作为世界上一次能源消费中的第四大能源资源,在历史长河中与人类生活密切相关,是唯一可存储和运输的可再生能源,在人类未来的能源系统中也将占有重要地位。因此,改变我国传统的能源生产、消费模式,利用生物质能等清洁可再生能源,对建立可持续发展的能源系统具有较大益处。我国的沼气资源相当富裕,而沼气的利用是一项惠国惠民的举措,未来有很大的发展前景。利用沼气满足村镇住宅采暖需求首先可以解决我国村镇的能源短缺现状;其次能够有效减少化石能源的利用和冬季采暖污染物排放;再次,将闲置的农作物秸秆和禽畜粪便利用起来,有助于构建整洁的村容,同时提高农民生活质量,是很有潜力的可再生能源建筑应用新技术。
沼气产量的多少主要受到沼液温度、pH值和料液浓度的影响,而温度受到室外环境的影响最大。由于发酵菌的活性值与温度呈正比例关系,沼气产生速率与发酵菌活性也呈现正相关。一般说来,在一定的范围之内,温度的高低决定了沼气的产量,温度越高,发酵菌活性越强,原料分解的速率加快,沼气产量自然提高。但是,如此情况下,发酵的周期便会相应变短,对原料的需求量会增加。北方寒冷季节,冬季沼气池内温度大多处于10℃以下,属于常温发酵,不利于沼气菌活性,厌氧作用不能顺利进行,产气量非常小,无法满足农村的采暖需求。根据研究得出:短时间内,温度升降5℃,沼气产气速率明显降低,变化范围过大,甚至停止产气,同时,温度的高低和浮动的大小还会影响甲烷含量。因此,如何有效的使沼液发酵温度维持在高产量区间,并且使其温度波动在1℃/d,对于沼气能否用于冬季采暖是决定性因素。
除此之外,沼气中的硫化氢燃烧后生成二氧化硫,它与燃烧产物中的水蒸气结合生成亚硫酸,使燃烧设备的低温部位金属表面产生腐蚀,还会造成对大气环境的污染,影响人体健康。利用沼气发电生产时,沼气中的硫化氢、二氧化硫等含硫杂质严重腐蚀柴油机机件。现在,沼气的热能利用设备的品种和数量不断增多,如沼气发电、烧锅炉、干燥、烘烤、暖房、孵化和养蚕等生产领域,并逐步向产品的标准化、系列化和工厂化发展。因此,对沼气进行净化,脱除沼气中的冷凝水、硫化氢和二氧化碳等杂质,使沼气的质量达到使用要求,是十分必要的。
沼气中含有大量二氧化碳具有阻燃作用,燃烧效果不佳,且在燃烧过程会产生氮氧化物污染环境,需要进一步处理。
发明内容
为了解决寒冷地区沼气产气率低问题,本发明提供了一种寒冷地区富氧燃烧沼气发电工程系统。该系统可以解决寒冷地区沼气发酵供热问题,该系统不仅可以有效脱出沼气中H2S,还可回收硫饼;采用富氧燃烧-沼液脱硝技术强化沼气燃烧和微碱性沼液脱出富氧燃烧主要氮氧化物气体NO、NO2;采用有机肥生产系统,脱硝后微酸性沼液浓缩制成叶面肥,沼渣通过进一步好氧发酵制成有机肥,提高收益。本发明通过以下技术方案实现。
一种寒冷地区富氧燃烧沼气发电工程系统,包括沼气发酵系统、沼气供热保温系统、沼气净化与贮存系统、富氧沼气发电系统、脱硝系统和有机肥生产系统;
所述沼气发酵系统包括预处理池、发酵罐体、后发酵罐和存储池,原料经预处理池处理后进入到发酵罐体中发酵产生沼气和剩余物,剩余物依次经后发酵罐二次发酵得到二次发酵物,二次发酵物经存储池存储后分离得到沼液和沼渣;
所述沼气供热保温系统为沼气发酵系统中的发酵罐体供热;
所述沼气净化与贮存系统包括过渡金属离子催化氧化吸收-富氧再生脱硫装置、沼气脱水的气水分离器和干式储气柜储气装置,所述沼气发酵系统中发酵罐体产生的沼气通过过渡金属离子催化氧化吸收-富氧再生脱硫装置的过渡金属离子吸收H2S气体进行脱硫再生沼气,脱硫再生沼气经沼气脱水的气水分离器脱水后在干式储气柜储气装置中储存;
所述富氧沼气发电系统包括富氧燃烧发电机组,干式储气柜储存的沼气装置进入到富氧燃烧发电机组中进行富氧燃烧发电,在此过程中产生剩余烟气;
所述脱硝系统包括脱硝装置,经富氧沼气发电系统剩余烟气进入到脱硝装置中,存储池存储后分离得到沼液进入到脱硝装置中对剩余烟气进行脱硝,脱硝后烟气进行排放;
所述有机肥生产系统包括沼液浓缩装置和有氧发酵装置,脱硝后沼液经沼液浓缩装置浓缩后得到叶面肥;存储池存储后分离得到沼渣经有氧发酵装置后得到有机肥。
所述发酵罐体中采用完全混合式厌氧消化方法进行厌氧发酵。
所述沼气供热保温系统采用微生物有氧发酵产生的热量和富氧沼气发电系统中富氧燃烧发电机组燃烧发电产生的热量为沼气发酵系统中的发酵罐体供热。
该寒冷地区富氧燃烧沼气发电工程系统的方法:
步骤1、将动物粪便收集后置于沼气发酵系统中的预处理池进行预处理,预处理后进行调配进入发酵罐体进行厌氧消化工艺发酵处理产生沼气和剩余物,厌氧消化工艺采用完全混合式厌氧消化工艺(CSTR);
步骤2、2.1、将步骤1得到的沼气通过沼气净化与贮存系统中的过渡金属离子催化氧化吸收-富氧再生脱硫装置,采用过渡金属离子酸根盐溶液催化氧化吸收沼气中H2S气体进行脱硫,过渡金属离子包括铜离子、铁离子、钴离子、镍离子等具有催化氧化作用的金属离子;吸收了H2S气体的过渡金属离子然后经压缩富氧空气再生过渡金属离子,将溶液中的还原性低价态金属离子氧化成氧化性高价态金属离子,并得到硫饼,经脱硫后的沼气进行脱水后在干式储气柜储气装置;2.2、将步骤1得到的剩余物进入后发酵罐进行二次发酵,后进入储存池分离沼液和沼渣;
步骤3、步骤2.1中产生的在干式储气柜储气装置中的沼气按照要求供给沼气发电机组富氧燃烧发电:沼气在富氧空气中燃烧效果好,燃烧温度相对较高,燃烧烟气中氮氧化物主要成分为NO、NO2;
步骤4、步骤2.2产生的沼液呈微碱性,可用于吸收沼气富氧燃烧后烟气中的NO2和等酸性气体生成无机酸根离子,将沼液放置到脱硝系统中的脱硝装置里,并向脱硝装置里通入步骤3产生的烟气脱除NO、NO2,在此过程中通入空气,经过烟气脱硝后排出;
步骤5、将步骤4剩余的沼液经有机肥生产系统中沼液浓缩装置浓缩后得到叶面肥;步骤2.2产生的沼渣经过有机肥生产系统中有氧发酵装置的有氧发酵进一步发酵制备有机肥;
在上述过程中沼气供热保温系统为沼气发酵系统中的发酵罐体供热,沼气供热保温系统采用微生物有氧发酵产生的热量和富氧沼气发电系统中富氧燃烧发电机组燃烧发电产生的热量为沼气发酵系统中的发酵罐体供热;微生物有氧发酵主要原料为各类农作物秸秆如玉米秸秆、大豆秸秆、水稻秸秆等;微生物发酵菌剂主要为市购的含有纤维素降解菌、木质素降解菌的各类复合有机肥发酵菌剂。
本发明的有益效果是:
1、本发明采用生物能源供热,可适用于寒冷地区沼气工程建设。
2、本发明采用过渡金属离子催化氧化吸收的方法吸收沼气中的H2S,形成的单质硫进行沉积分离提纯,生产硫饼。
3、本发明采用富氧燃烧-沼液脱硝,有效改善由于沼气中二氧化碳高而导致阻燃效果,并将沼液改性为微酸性,浓缩成叶面肥,可适用于北方偏盐碱性土地。
4、本发明沼气发电工程系统,该系统流程工艺简单、易操作、成本低、运行稳定、污染物排放超低、技术成熟。
附图说明
图1是本发明流程示意图。
具体实施方式
下面结合附图和具体实施方式,对本发明作进一步说明。
实施例1
如图1所示,该寒冷地区富氧燃烧沼气发电工程系统,包括沼气发酵系统、沼气供热保温系统、沼气净化与贮存系统、富氧沼气发电系统、脱硝系统和有机肥生产系统;
所述沼气发酵系统包括预处理池、发酵罐体、后发酵罐和存储池,原料经预处理池处理后进入到发酵罐体中发酵产生沼气和剩余物,剩余物依次经后发酵罐二次发酵得到二次发酵物,二次发酵物经存储池存储后分离得到沼液和沼渣;
所述沼气供热保温系统为沼气发酵系统中的发酵罐体供热;
所述沼气净化与贮存系统包括过渡金属离子催化氧化吸收-富氧再生脱硫装置、沼气脱水的气水分离器和干式储气柜储气装置,所述沼气发酵系统中发酵罐体产生的沼气通过过渡金属离子催化氧化吸收-富氧再生脱硫装置的过渡金属离子吸收H2S气体进行脱硫再生沼气,脱硫再生沼气经沼气脱水的气水分离器脱水后在干式储气柜储气装置中储存;
所述富氧沼气发电系统包括富氧燃烧发电机组,干式储气柜储存的沼气装置进入到富氧燃烧发电机组中进行富氧燃烧发电,在此过程中产生剩余烟气;
所述脱硝系统包括脱硝装置,经富氧沼气发电系统剩余烟气进入到脱硝装置中,存储池存储后分离得到沼液进入到脱硝装置中对剩余烟气进行脱硝,脱硝后烟气进行排放;
所述有机肥生产系统包括沼液浓缩装置和有氧发酵装置,脱硝后沼液经沼液浓缩装置浓缩后得到叶面肥;存储池存储后分离得到沼渣经有氧发酵装置后得到有机肥。其中发酵罐体中采用完全混合式厌氧消化方法进行厌氧发酵;沼气供热保温系统采用微生物有氧发酵产生的热量和富氧沼气发电系统中富氧燃烧发电机组燃烧发电产生的热量为沼气发酵系统中的发酵罐体供热。
以上结合附图对本发明的具体实施方式作了详细说明,但是本发明并不限于上述实施方式,在本领域普通技术人员所具备的知识范围内,还可以在不脱离本发明宗旨的前提下作出各种变化。
Claims (3)
1.一种寒冷地区富氧燃烧沼气发电工程系统,其特征在于:包括沼气发酵系统、沼气供热保温系统、沼气净化与贮存系统、富氧沼气发电系统、脱硝系统和有机肥生产系统;
所述沼气发酵系统包括预处理池、发酵罐体、后发酵罐和存储池,原料经预处理池处理后进入到发酵罐体中发酵产生沼气和剩余物,剩余物依次经后发酵罐二次发酵得到二次发酵物,二次发酵物经存储池存储后分离得到沼液和沼渣;
所述沼气供热保温系统为沼气发酵系统中的发酵罐体供热;
所述沼气净化与贮存系统包括过渡金属离子催化氧化吸收-富氧再生脱硫装置、沼气脱水的气水分离器和干式储气柜储气装置,所述沼气发酵系统中发酵罐体产生的沼气通过过渡金属离子催化氧化吸收-富氧再生脱硫装置的过渡金属离子吸收H2S气体进行脱硫再生沼气,脱硫再生沼气经沼气脱水的气水分离器脱水后在干式储气柜储气装置中储存;
所述富氧沼气发电系统包括富氧燃烧发电机组,干式储气柜储存的沼气装置进入到富氧燃烧发电机组中进行富氧燃烧发电,在此过程中产生剩余烟气;
所述脱硝系统包括脱硝装置,经富氧沼气发电系统剩余烟气进入到脱硝装置中,存储池存储后分离得到沼液进入到脱硝装置中对剩余烟气进行脱硝,脱硝后烟气进行排放;
所述有机肥生产系统包括沼液浓缩装置和有氧发酵装置,脱硝后沼液经沼液浓缩装置浓缩后得到叶面肥;存储池存储后分离得到沼渣经有氧发酵装置后得到有机肥。
2.根据权利要求1所述的寒冷地区富氧燃烧沼气发电工程系统,其特征在于:所述发酵罐体中采用完全混合式厌氧消化方法进行厌氧发酵。
3.根据权利要求1所述的寒冷地区富氧燃烧沼气发电工程系统,其特征在于:所述沼气供热保温系统采用微生物有氧发酵产生的热量和富氧沼气发电系统中富氧燃烧发电机组燃烧发电产生的热量为沼气发酵系统中的发酵罐体供热。
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