The utility model relates to a device for producing ammonia water for denitrification with raw ammonia water. The vapor phase medium from the top of the distillation tower is condensed and cooled into two or more different concentrations of ammonia water using heat exchanger equipment, including at least one relatively low concentration of ammonia water, which is used as the working fluid of the vacuum device after cooling, so that the vacuum pump can obtain lower negative operating pressure at the bottom of the tower or at the same time. In order to reduce the consumption of alkali, a small amount of heat is added in the reactor to reduce the consumption of alkali, and two or more stages of reflux are designed to improve the concentration of ammonia water and the recovery rate of ammonia, thus overcoming the key technical problems such as secondary vaporization of vacuum pump and equipment crystallization easily caused by high concentration ammonia water, so that the process can recover the low-grade waste heat at the lowest temperature of 65 degrees C and minimize the treatment of ammonia water per ton of raw material. Ultra-low energy consumption index of 10 kg steam consumption, concentration of ammonia water over 30% and recovery rate of ammonia as high as 98%, and the process equipment of this process is compatible with the current level of equipment design and manufacture, so as to realize stable operation of production.
【技术实现步骤摘要】
一种用原料氨水生产脱硝用氨水用装置
本技术涉及环境保护的废水处理领域,尤其是一种以原料氨水生产脱硝用氨水用装置。
技术介绍
目前在烟气脱硝
以SCR类的脱硝技术应用最为广泛,该技术的关键过程需要用氨作为还原剂,将氮氧化物还原为氮气,实现脱硝目的。所需的氨水可由多种方法制取,用原料氨水制取浓度为5~20%(质量百分比,余同)的氨水是其中的一种传统工艺方法。原料氨水是指化肥、冶金、焦化、垃圾处理、煤化工等领域的生产过程中产生的低浓度含氨废水(氨氮含量0.1%~4%),原料氨水通过常压或负压精馏方法,在精馏塔顶部获得浓氨水(2%~20%),塔底获得氨氮含量极低(50~300PPM)的废水,塔底的废水再送到后续单元进行深度处理。在生产实践中发现传统工艺方法存在以下明显缺点:能耗大,氨回收率低和氨浓度不好控制,氨水中杂质含量高。精馏过程需要消耗大量能源,以蒸汽为例,处理每吨原料氨水需消耗约150~250kg蒸汽,改进型的负压精馏工艺,实际运行时节能约30%,即每吨原料氨水需消耗约110~175kg蒸汽,即使用导热油、管式炉、烟气热量、热介质等其它方式进行加热,也需要消 ...
【技术保护点】
1.一种用原料氨水生产脱硝用氨水用装置,其特征在于,包括碱液混合装置、精馏塔、冷凝器和真空装置,真空装置用于维持精馏塔的负压,原料氨水与碱液在碱液混合装置中充分混合后进入精馏塔内进行精馏分离,精馏塔的塔顶设置有分凝器,分凝器用于将精馏塔塔顶的气相物质冷凝,冷凝的液体回流至精馏塔塔釜作为第一级回流,未冷凝的气相部分进入冷凝器继续冷凝;气相介质刚进入冷凝器不远处的某段开一个采出口,排出中浓度氨水,气相介质完全通过冷凝器后排出高浓度氨水;中浓度氨水一部分流入真空装置作为其工作液的补液,另一部分自流至回流槽,回流槽上设置有回流泵,回流泵将回流槽内液体打到精馏塔塔顶作为第二级回流。
【技术特征摘要】
1.一种用原料氨水生产脱硝用氨水用装置,其特征在于,包括碱液混合装置、精馏塔、冷凝器和真空装置,真空装置用于维持精馏塔的负压,原料氨水与碱液在碱液混合装置中充分混合后进入精馏塔内进行精馏分离,精馏塔的塔顶设置有分凝器,分凝器用于将精馏塔塔顶的气相物质冷凝,冷凝的液体回流至精馏塔塔釜作为第一级回流,未冷凝的气相部分进入冷凝器继续冷凝;气相介质刚进入冷凝器不远处的某段开一个采出口,排出中浓度氨水,气相介质完全通过冷凝器后排出高浓度氨水;中浓度氨水一部分流入真空装置作为其工作液的补液,另一部分自流至回流槽,回流槽上设置有回流泵,回流泵将回流槽内液体打到精馏塔塔顶作为第二级回流。2.如权利要求1所述的用原料氨水生产脱硝用氨水用装置,其特征在于,精馏塔塔釜内的废水从塔底出口用管经废水循环泵抽出与再沸器进行换热,换热后再次回到精馏塔塔釜,多余的废水从废水循环泵的出口管道...
【专利技术属性】
技术研发人员:王秋香,孙冬杰,
申请(专利权)人:连云港力场创新科技有限公司,
类型:新型
国别省市:江苏,32
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