CN111564646B - 一种熔融碳酸盐燃料电池隔膜焙烧的在线评价方法 - Google Patents
一种熔融碳酸盐燃料电池隔膜焙烧的在线评价方法 Download PDFInfo
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Abstract
本发明公开了一种熔融碳酸盐燃料电池隔膜焙烧的在线评价方法,包括以下步骤:1)估算熔融碳酸盐燃料电池隔膜所含的溶剂、粘结剂及增塑剂的质量;2)设定熔融碳酸盐燃料电池隔膜焙烧的升温程序;3)根据熔融碳酸盐燃料电池隔膜焙烧的升温程序,对组装后的熔融碳酸盐燃料电池进行升温焙烧,当熔融碳酸盐燃料电池内部经过活化反应后,对熔融碳酸盐燃料电池进行放电测试,其中,当熔融碳酸盐燃料电池的阴极与阳极未发生窜气或漏气危险,且单个电池的平均开路电压大于预设电压值时,则说明熔融碳酸盐燃料电池隔膜焙烧合格,完成熔融碳酸盐燃料电池隔膜焙烧的在线评价,该方法能够有效的保证熔融碳酸盐燃料电池的发电性能。
Description
技术领域
本发明属于熔融碳酸盐燃料电池技术领域,涉及一种熔融碳酸盐燃料电池隔膜焙烧的在线评价方法。
背景技术
熔融碳酸盐燃料电池(MCFC)是一种工作于650℃的高温燃料电池,具有不需要贵金属作催化剂、燃料来源广、噪音低、污染物基本达到近零排放、发电效率高、可实现热电联供等优点,适合于百千瓦级至兆瓦级分布式电站或固定电站,具有良好的发展前景。
熔融碳酸盐燃料电池的关键核心部件包括电极、隔膜、电解质、双极板等,其中隔膜性能的好坏对电池性能影响非常大。一般来说,隔膜的性能与其孔隙率和平均孔径有很大关系,定型后的隔膜的孔分布主要取决于定型前膜中所含的不易挥发的粘结剂和溶剂的含量及其分布的均匀程度。含量较高时,定型后膜的孔隙率和平均孔径较大,膜中浸入的电解质较多,膜电阻小,但由于平均孔径大,容易发生阴阳极窜气的危险;含量较低时,导致膜孔隙率和平均孔径减小,这虽然有利于阻气,却降低了膜中浸入的电解质,不利于离子导电。因此,要求隔膜有一个合理的孔隙率及孔径分布,一般要求隔膜的孔隙率为50~70%,孔径小于1μm,而且分布均匀。
熔融碳酸盐燃料电池隔膜是在电池首次启动时进行原位焙烧,因此首次的焙烧效果直接决定电池的性能。由于技术保密及技术封锁,我国在MCFC方面的研究还处于初级阶段。目前从事MCFC研究的单位主要有中国科学院大连化学物理研究所、中国华能集团清洁能源技术研究院有限公司以及一些高等院校,在熔融碳酸盐燃料电池隔膜焙烧效果的在线评价方面尚无相关的论述与著作,因此不能有效保证熔融碳酸盐燃料电池的发电性能。
发明内容
本发明的目的在于克服上述现有技术的缺点,提供了一种熔融碳酸盐燃料电池隔膜焙烧的在线评价方法,该方法能够有效的保证熔融碳酸盐燃料电池的发电性能。
为达到上述目的,本发明所述的熔融碳酸盐燃料电池隔膜焙烧的在线评价方法包括以下步骤:
1)在组装熔融碳酸盐燃料电池之前,记录熔融碳酸盐燃料电池隔膜的重量,根据熔融碳酸盐燃料电池隔膜的配方,估算熔融碳酸盐燃料电池隔膜所含的溶剂、粘结剂及增塑剂的质量;
2)根据熔融碳酸盐燃料电池隔膜的热重曲线,设定熔融碳酸盐燃料电池隔膜焙烧的升温程序;
3)根据熔融碳酸盐燃料电池隔膜焙烧的升温程序,对组装后的熔融碳酸盐燃料电池进行升温焙烧,其中,在升温过程中,向熔融碳酸盐燃料电池的阴极通入空气,向熔融碳酸盐燃料电池的阳极通入氮气,同时在线监测阴极尾气出口的氧气浓度变化,当氧气浓度由大变小又逐渐变大时,则说明熔融碳酸盐燃料电池隔膜内的溶剂、粘结剂及增塑剂已燃烧完全,此时熔融碳酸盐燃料电池隔膜为多孔片状结构;
当熔融碳酸盐燃料电池稳定在490~500℃时,则关闭阴极的进气,此时电解质逐步熔解浸入熔融碳酸盐燃料电池隔膜中;
当熔融碳酸盐燃料电池稳定在600~650℃时,电解质浸满熔融碳酸盐燃料电池,此时熔融碳酸盐燃料电池已具备发电能力,向熔融碳酸盐燃料电池的阳极通入氢气,向熔融碳酸盐燃料电池的阴极通入空气及二氧化碳,当熔融碳酸盐燃料电池内部经过活化反应后,对熔融碳酸盐燃料电池进行放电测试,其中,当熔融碳酸盐燃料电池的阴极与阳极未发生窜气或漏气危险,且单个电池的平均开路电压大于预设电压值时,则说明熔融碳酸盐燃料电池隔膜焙烧合格,否则,则说明熔融碳酸盐燃料电池隔膜焙烧不合格,完成熔融碳酸盐燃料电池隔膜焙烧的在线评价。
在升温过程中,向熔融碳酸盐燃料电池的阴极通入1L/min的空气,向熔融碳酸盐燃料电池的阳极通入0.5L/min的氮气。
当熔融碳酸盐燃料电池稳定在600~650℃时,电解质浸满熔融碳酸盐燃料电池,此时熔融碳酸盐燃料电池已具备发电能力,向熔融碳酸盐燃料电池的阳极通入1L/min的氢气,向熔融碳酸盐燃料电池的阴极通入3L/min的空气及1L/min的二氧化碳。
预设电压值为1.1V。
本发明具有以下有益效果:
本发明所述的熔融碳酸盐燃料电池隔膜焙烧的在线评价方法在具体操作时,在对电池进行升温焙烧过程中,向阴极通入空气,向阳极通入氮气,以防止阳极氧化,同时在焙烧过程中,通过在线监测阴极尾气出口的氧气浓度变化,当氧气浓度由大变小又逐渐变大时,说明隔膜内的粘结剂及增塑剂已燃烧完全,此时隔膜形成一定的多孔片状结构;同时当电池已初步具备的发电能力时,向阳极通入氢气,向阴极通入空气和二氧化碳,当电池内部经过短暂的活化反应后,即可对电池进行放电测试,在测试过程中,当电池阴阳两极未发生窜气或漏气危险,且单电池的平均开路电压大于1.1V,则说明电池隔膜焙烧合格,以实现熔融碳酸盐燃料电池隔膜焙烧的在线评价,保证熔融碳酸盐燃料电池的发电性能,在优化MCFC发电性能等方面具有重要的指导意义。
附图说明
图1为本发明的流程图。
具体实施方式
下面结合附图对本发明做进一步详细描述:
参考图1,本发明所述的熔融碳酸盐燃料电池隔膜焙烧的在线评价方法包括以下步骤:
1)在组装熔融碳酸盐燃料电池之前,记录熔融碳酸盐燃料电池隔膜的重量,根据熔融碳酸盐燃料电池隔膜的配方,估算熔融碳酸盐燃料电池隔膜所含的溶剂、粘结剂及增塑剂的质量;
2)根据熔融碳酸盐燃料电池隔膜的热重曲线,设定熔融碳酸盐燃料电池隔膜焙烧的升温程序;
3)根据熔融碳酸盐燃料电池隔膜焙烧的升温程序,对组装后的熔融碳酸盐燃料电池进行升温焙烧,其中,在升温过程中,向熔融碳酸盐燃料电池的阴极通入空气,向熔融碳酸盐燃料电池的阳极通入氮气,同时在线监测阴极尾气出口的氧气浓度变化,当氧气浓度由大变小又逐渐变大时,则说明熔融碳酸盐燃料电池隔膜内的溶剂、粘结剂及增塑剂已燃烧完全,此时熔融碳酸盐燃料电池隔膜为多孔片状结构;
当熔融碳酸盐燃料电池稳定在490~500℃时,则关闭阴极的进气,此时电解质逐步熔解浸入熔融碳酸盐燃料电池隔膜中;
当熔融碳酸盐燃料电池稳定在600~650℃时,电解质浸满熔融碳酸盐燃料电池,此时熔融碳酸盐燃料电池已具备发电能力,向熔融碳酸盐燃料电池的阳极通入氢气,向熔融碳酸盐燃料电池的阴极通入空气及二氧化碳,当熔融碳酸盐燃料电池内部经过活化反应后,对熔融碳酸盐燃料电池进行放电测试,其中,当熔融碳酸盐燃料电池的阴极与阳极未发生窜气或漏气危险,且单个电池的平均开路电压大于1.1V时,则说明熔融碳酸盐燃料电池隔膜焙烧合格,否则,则说明熔融碳酸盐燃料电池隔膜焙烧不合格,完成熔融碳酸盐燃料电池隔膜焙烧的在线评价。
实施例一
本实施例的具体操作过程为:
1)准备一对电极有效面积为0.2m2的熔融碳酸盐燃料电池单电池,选取一张隔膜,隔膜的厚度为0.7mm,重量为420g,根据隔膜制备的配方,估计偏铝酸锂粉末含量约为70~80%;
2)根据隔膜的热重曲线,制定出隔膜焙烧的升温程序;
3)按照升温程序,对组装的单电池进行升温焙烧,升温过程中,向阴极通入1L/min的空气,向阳极通入0.5L/min的氮气;
4)使用氧气浓度检测仪,对阴极尾气进行监测,当氧气浓度由刚开始的0.2L/min重新回至0.2L/min左右时,则说明隔膜内的粘结剂及增塑剂等基本焙烧完全;
当电池稳定达到490~500℃时,关闭阴极进气;
当电池稳定达到600~650℃时,电解质基本浸满隔膜,再向阳极通入1L/min的氢气,向阴极通入3L/min的空气及1L/min的二氧化碳,当电池内部经过短暂的活化反应后,即可对电池进行放电测试;
其中,隔膜焙烧好坏判断的依据是电池阴阳两极未发生窜气或漏气危险,单电池的开路电压达到1.12V,说明此次隔膜焙烧较好。
Claims (4)
1.一种熔融碳酸盐燃料电池隔膜焙烧的在线评价方法,其特征在于,包括以下步骤:
1)在组装熔融碳酸盐燃料电池之前,记录熔融碳酸盐燃料电池隔膜的重量,根据熔融碳酸盐燃料电池隔膜的配方,估算熔融碳酸盐燃料电池隔膜所含的溶剂、粘结剂及增塑剂的质量;
2)根据熔融碳酸盐燃料电池隔膜的热重曲线,设定熔融碳酸盐燃料电池隔膜焙烧的升温程序;
3)根据熔融碳酸盐燃料电池隔膜焙烧的升温程序,对组装后的熔融碳酸盐燃料电池进行升温焙烧,其中,在升温过程中,向熔融碳酸盐燃料电池的阴极通入空气,向熔融碳酸盐燃料电池的阳极通入氮气,同时在线监测阴极尾气出口的氧气浓度变化,当氧气浓度由大变小又逐渐变大时,则说明熔融碳酸盐燃料电池隔膜内的溶剂、粘结剂及增塑剂已燃烧完全,此时熔融碳酸盐燃料电池隔膜为多孔片状结构;
当熔融碳酸盐燃料电池稳定在490~500℃时,则关闭阴极的进气,此时电解质逐步熔解浸入熔融碳酸盐燃料电池隔膜中;
当熔融碳酸盐燃料电池稳定在600~650℃时,电解质浸满熔融碳酸盐燃料电池,此时熔融碳酸盐燃料电池已具备发电能力,向熔融碳酸盐燃料电池的阳极通入氢气,向熔融碳酸盐燃料电池的阴极通入空气及二氧化碳,当熔融碳酸盐燃料电池内部经过活化反应后,对熔融碳酸盐燃料电池进行放电测试,其中,当熔融碳酸盐燃料电池的阴极与阳极未发生窜气或漏气危险,且单个电池的平均开路电压大于预设电压值时,则说明熔融碳酸盐燃料电池隔膜焙烧合格,否则,则说明熔融碳酸盐燃料电池隔膜焙烧不合格,完成熔融碳酸盐燃料电池隔膜焙烧的在线评价。
2.根据权利要求1所述的熔融碳酸盐燃料电池隔膜焙烧的在线评价方法,其特征在于,在升温过程中,向熔融碳酸盐燃料电池的阴极通入1L/min的空气,向熔融碳酸盐燃料电池的阳极通入0.5L/min的氮气。
3.根据权利要求1所述的熔融碳酸盐燃料电池隔膜焙烧的在线评价方法,其特征在于,当熔融碳酸盐燃料电池稳定在600~650℃时,电解质浸满熔融碳酸盐燃料电池,此时熔融碳酸盐燃料电池已具备发电能力,向熔融碳酸盐燃料电池的阳极通入1L/min的氢气,向熔融碳酸盐燃料电池的阴极通入3L/min的空气及1L/min的二氧化碳。
4.根据权利要求1所述的熔融碳酸盐燃料电池隔膜焙烧的在线评价方法,其特征在于,预设电压值为1.1V。
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