CN113277586A - 一种煤气化装置放空蒸汽回收系统 - Google Patents
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Abstract
本发明涉及煤化工技术领域,公开了一种煤气化装置放空蒸汽回收系统,包括除氧水槽、高压闪蒸分离器以及灰水槽,所述除氧水槽的气相出口通过放空气管线配管连接于放空气冷却器,放空气冷却器在换热后使得放空气中水蒸汽被冷凝后进入到灰水槽中回收;所述放空气冷却器中的不凝气同高压闪蒸分离器的气相不凝气一起送入到变换装置汽提塔中汽提处理。本发明,采取将除氧水槽放空气引至放空气冷却器当中,冷凝后的蒸汽冷凝液回收至系统循环利用,不凝汽同其他装置不凝汽一道送入汽提塔分离处理的方式,实现蒸汽回收和不凝汽处理,并保证回收后装置水质不受影响。
Description
技术领域
本发明涉及煤化工技术领域,具体是一种煤气化装置放空蒸汽回收系统。
背景技术
随着国家对企业环保要求的不断提升,国内煤化工行业对减少“三废”排放的研究与应用工作也相应开展起来,行业内“三废”研究治理主要集中在废水减排与治理方面,但是对废气的研究应用进度相较滞后。在以多元料浆为主体的煤炭气化工艺当中,为减轻系统加入的氧气在灰水中大量存在加速设备管道腐蚀,往往通过热力除氧的方式将灰水中大部分氧气去除,这些需要除氧的介质包括高压闪蒸汽冷凝液,煤气化产生的煤浆灰水,工艺气变换后产生的高低压冷凝液和工厂用新水废液。这些液体与低压蒸汽,闪蒸汽在填料内逆向接触进行传质传热,达到除氧目的。
现有煤气化装置存在的工艺缺陷:煤气化装置热力除氧设备产生的放空气不仅造成大量蒸汽浪费,产生“蒸汽白龙”,并且在除氧的同时将介质中CO,CO2,H2S等气体一并解析出随蒸汽放空,对大气环境造成不利影响。
发明内容
本发明的目的在于提供一种煤气化装置放空蒸汽回收系统,以解决上述背景技术中提出的问题:煤气化装置除氧水设备运行过程中造成大量蒸汽浪费以及污染气体排放。
为实现上述目的,本发明提供如下技术方案:
一种煤气化装置放空蒸汽回收系统,包括除氧水槽、高压闪蒸分离器以及灰水槽,所述除氧水槽的气相出口通过放空气管线配管连接于放空气冷却器,放空气冷却器在换热后使得放空气中水蒸汽被冷凝后进入到灰水槽中回收;
所述放空气冷却器中的不凝气同高压闪蒸分离器的气相不凝气一起送入到变换装置汽提塔中汽提处理。
作为本发明进一步的方案:所述高压闪蒸分离器的液相端连接灰水加热器。
作为本发明进一步的方案:所述放空气管线配管上安装放空气管线消音器。
作为本发明进一步的方案:所述灰水槽与除氧水槽的液相进端连接低压灰水泵。
作为本发明进一步的方案:所述除氧水槽的液相进端连接除氧水泵。
作为本发明再进一步的方案:所述除氧水槽的气相进端连接低压闪蒸汽冷却器,低压闪蒸汽冷却器的气相进端连接有低温热水器。
与现有技术相比,本发明的有益效果是:采取将除氧水槽放空气引至放空气冷却器当中,冷凝后的蒸汽冷凝液回收至系统循环利用,不凝汽同其他装置不凝汽一道送入汽提塔分离处理的方式,实现蒸汽回收和不凝汽处理,并保证回收后装置水质不受影响。
附图说明
图1为一种煤气化装置放空蒸汽回收系统的结构示意图。
图中:1、低温热水器;2、低压闪蒸汽冷却器;3、高压闪蒸汽分离器;4、除氧水槽;5、灰水加热器;6、放空气管线消音器;7、放空气冷却器;8、灰水槽;9、低压灰水泵; 10、除氧水泵。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的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。
请参阅图1,本发明实施例中,一种煤气化装置放空蒸汽回收系统,包括除氧水槽4、高压闪蒸分离器3以及灰水槽8,所述除氧水槽4的气相出口通过放空气管线配管连接于放空气冷却器7,放空气冷却器7在换热后使得放空气中水蒸汽被冷凝后进入到灰水槽8 中回收;
所述放空气冷却器7中的不凝气同高压闪蒸分离器3的气相不凝气一起送入到变换装置汽提塔中汽提处理,达到既对水资源进行回收,也对CO等污染气体进行分离处理的效果。
所述高压闪蒸分离器3的液相端连接灰水加热器5,所述放空气管线配管上安装放空气管线消音器6,所述灰水槽8与除氧水槽4的液相进端连接低压灰水泵9,所述除氧水槽4的液相进端连接除氧水泵10,所述除氧水槽4的气相进端连接低压闪蒸汽冷却器2,低压闪蒸汽冷却器2的气相进端连接有低温热水器1。
本发明的工作原理是:进入除氧水槽4的液相介质有高压闪蒸汽分离器3液相(分离器介质由高温热水器气相闪蒸汽经过灰水加热器5于洗涤塔灰水换热后进入)、气化装置新鲜水、灰水槽8灰水和变换装置的高低压冷凝液(后两者由低压灰水泵9提供压力送入);气相介质有管网低压蒸汽和低压闪蒸汽冷却器2气相(该冷却器介质为气化炉产生的黑水进入高温热水器后,底部黑水进入低温热水器1进一步闪蒸产生的闪蒸汽和不凝汽),在除氧水槽4中,控制水槽压力在0.06~0.08MPa,温度在100~110℃,该操作压力下由于气相蒸汽的加入,氧气及其他气体分压降低,由于气液平衡被破坏促使液相中氧气和其他气体不断析出至气相放空,由于同压力下氧气,CO等解析出气体的沸点远低于水,故通过换热器后蒸汽被冷凝回收,不凝气同高压闪蒸汽分离器3气相不凝汽一并送入变换装置汽提塔处理。
通过实施本发明采取的煤气化装置放空蒸汽回收系统,首先实现了对水蒸汽的回收利用,水蒸汽回收率达70%以上;其次本回收系统实现了对CO,H2S等大气污染物的分离处理,减少煤气化装置的环境污染;最后本回收系统对放空蒸汽回收后,煤气化装置灰水品质未发生改变,PH保持在7~9,氨氮含量≤300mg/l,COD保持在350~800mg/l。
本发明,放空蒸汽回收系统额外设备少,施工周期短,投资回报率高;系统工艺路线安全、可靠、易行;同时实现了对水蒸汽冷凝回收和放空气中不凝汽分离处理的目的。
对于本领域技术人员而言,显然本发明不限于上述示范性实施例的细节,而且在不背离本发明的精神或基本特征的情况下,能够以其他的具体形式实现本发明。因此,无论从哪一点来看,均应将实施例看作是示范性的,而且是非限制性的,本发明的范围由所附权利要求而不是上述说明限定,因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。
此外,应当理解,虽然本说明书按照实施方式加以描述,但并非每个实施方式仅包含一个独立的技术方案,说明书的这种叙述方式仅仅是为清楚起见,本领域技术人员应当将说明书作为一个整体,各实施例中的技术方案也可以经适当组合,形成本领域技术人员可以理解的其他实施方式。
Claims (6)
1.一种煤气化装置放空蒸汽回收系统,其特征在于,包括除氧水槽、高压闪蒸分离器以及灰水槽,所述除氧水槽的气相出口通过放空气管线配管连接于放空气冷却器,放空气冷却器在换热后使得放空气中水蒸汽被冷凝后进入到灰水槽中回收;
所述放空气冷却器中的不凝气同高压闪蒸分离器的气相不凝气一起送入到变换装置汽提塔中汽提处理。
2.根据权利要求1所述的一种煤气化装置放空蒸汽回收系统,其特征在于,所述高压闪蒸分离器的液相端连接灰水加热器。
3.根据权利要求1或2所述的一种煤气化装置放空蒸汽回收系统,其特征在于,所述放空气管线配管上安装放空气管线消音器。
4.根据权利要求1所述的一种煤气化装置放空蒸汽回收系统,其特征在于,所述灰水槽与除氧水槽的液相进端连接低压灰水泵。
5.根据权利要求4所述的一种煤气化装置放空蒸汽回收系统,其特征在于,所述除氧水槽的液相进端连接除氧水泵。
6.根据权利要求5所述的一种煤气化装置放空蒸汽回收系统,其特征在于,所述除氧水槽的气相进端连接低压闪蒸汽冷却器,低压闪蒸汽冷却器的气相进端连接有低温热水器。
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