The recycling method of coal fired additives in coal ash in high ridge soil based on coal fired boiler in the process of high sodium coal combustion in the process of adding kaolin to alleviate the slagging problem, can not accurately control the proportion of mixing and kaolin additives can not recycle and other problems, the use of a single grinding machine grinding kaolin, and the grinding grain size model Kaolin, which is slightly larger than pulverized coal, is stored in a silo. Kaolin is sent directly into the air pipe and pulverized coal by mixing the kaolin directly into the coal powder. The fly ash in the dust collector is separated and the large size fly ash is taken out for acid washing, filtration and drying, and the composition analysis and ash melting of the treated fly ash are carried out. When the mass fraction of Na2O in the treated large particles is less than 2% and the softening temperature is higher than 1300 C, it is sent to the silo for re grinding. On the one hand, this method realizes the recycling of kaolin additives, reduces the cost of the raw materials of the enterprises, and on the other hand, it can also accurately control the blending ratio of kaolin.
【技术实现步骤摘要】
粉煤灰中高岭土基燃煤添加剂的循环利用方法
本专利技术属于火力发电领域,涉及粉煤灰中高岭土基燃煤添加剂的循环利用方法。
技术介绍
目前,我国电站锅炉主要以煤作为主要燃料。新疆准东煤田已探明储量达到3900亿吨,是我国最大的整装煤田,也是我国未来重点发展的能源基地之一。然而,准东煤中钠含量较高,其灰成分Na2O含量大多超过5%,远高于普通煤种灰中Na2O含量水平(通常<1%)。煤中水溶性钠和酸溶性钠在燃烧过程的高温环境中容易气化,当烟气温度降低时,一部分气相钠的化合物会在受热面管壁凝结,形成熔融态的液膜,进而黏附其他固体灰颗粒,将引起严重的结渣;还有一部分会在灰颗粒表面凝结,并在灰颗粒表面形成熔融态的膜,这些灰颗粒可直接黏附在受热面或沉积物表面上,引起结渣。为了缓解高钠煤燃烧过程中严重的结渣问题,常采用的方法是在煤燃烧过程中添加硅铝基高熔点添加剂。受当地矿物资源分布情况限制,目前采用的添加剂主要是高岭土。高岭土在高温条件下可与烟气中由煤燃烧释放的气相碱金属发生物理化学反应,降低烟气中气相碱金属浓度,从而能够有效地缓解准东煤的结渣问题。然而,目前在高钠煤燃 ...
【技术保护点】
粉煤灰中高岭土基燃煤添加剂的循环利用方法,其特征在于包括以下步骤:1)将高岭土送入磨粉机中研磨;2)将磨好的高岭土粉末存放在粉仓中;3)将高岭土按配比需求,与煤粉充分混合,并参与燃烧;4)将除尘器中的粉煤灰进行分离,将小粒径粉煤灰颗粒直接送入灰仓,而大粒径粉煤灰选出备用;5)采用溶液浸渍选出的大粒径粉煤灰,并过滤、干燥;6)对干燥后的大颗粒粉煤灰开展实验分析,将满足要求的粉煤灰送入磨粉机重新磨制,而将不满足要求的粉煤灰送回灰仓。
【技术特征摘要】
1.粉煤灰中高岭土基燃煤添加剂的循环利用方法,其特征在于包括以下步骤:1)将高岭土送入磨粉机中研磨;2)将磨好的高岭土粉末存放在粉仓中;3)将高岭土按配比需求,与煤粉充分混合,并参与燃烧;4)将除尘器中的粉煤灰进行分离,将小粒径粉煤灰颗粒直接送入灰仓,而大粒径粉煤灰选出备用;5)采用溶液浸渍选出的大粒径粉煤灰,并过滤、干燥;6)对干燥后的大颗粒粉煤灰开展实验分析,将满足要求的粉煤灰送入磨粉机重新磨制,而将不满足要求的粉煤灰送回灰仓。2.根据权利要求1所述的粉煤灰中高岭土基燃煤添加剂的循环利用方法,其特征在于:采用磨粉机将高岭土磨碎,送入粉仓的粉煤...
【专利技术属性】
技术研发人员:魏博,张雪慧,孟永彪,马瑞,王杰刚,排日代·赛米,马凤云,
申请(专利权)人:新疆大学,
类型:发明
国别省市:新疆,65
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