CN210340328U - 一种一体式连续制氧制氮装置 - Google Patents

一种一体式连续制氧制氮装置 Download PDF

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CN210340328U
CN210340328U CN201920960290.2U CN201920960290U CN210340328U CN 210340328 U CN210340328 U CN 210340328U CN 201920960290 U CN201920960290 U CN 201920960290U CN 210340328 U CN210340328 U CN 210340328U
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oxygen
nitrogen
adsorption tower
air
buffer tank
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徐超
刘硕
雷雳
李永先
范斌
李小伟
陈虹
王艳虹
刘兴东
怀春雷
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Sinopec Ningbo Engineering Co Ltd
Sinopec Ningbo Technology Research Institute
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Sinopec Ningbo Technology Research Institute
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  • Separation Of Gases By Adsorption (AREA)
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Abstract

本实用新型公开的一体式连续制氧制氮装置，包括生产氮气及液氮产品的深冷制氮装置和用于生产氧气产品的变压吸附制氧装置，深冷制氮装置的富氧空气出口与一富氧空气缓冲罐的入口连接，富氧空气缓冲罐的出口与变压吸附制氧装置的入口连接，变压吸附制氧装置的运行由一PLC控制系统控制。该一体式连续制氧制氮装置，将深冷制氮装置、富氧空气缓冲罐和变压吸附制氧装置依次串联，既解决了富氧空气的压力及组成波动问题，实现了氧气、氮气及液氮产品的连续稳定的生产，同时解决了现有深冷制氮装置将富氧空气放空所造成的能量损失问题。该一体式连续制氧制氮装置生产的氮气、氧气纯度高，并能同时生产液氮产品，应用范围大。

Description

一种一体式连续制氧制氮装置
技术领域
本实用新型涉及一种制氧制氮装置，具体是一种一体式连续制氧制氮装置。
背景技术
现有的深冷制氮装置由于结构限制及工艺流程原因，只生产氮气产品，在制取氮气产品后，将大量的富氧空气放空，造成了能量的损失。
专利文件CN203833611U公开了一种适用于一套或多套PSA制氮装置附产富氧的回收装置，包括依次连接的变压吸附制氮装置、富氧回收程控阀、富氧回收低压缓冲罐、气动薄膜切断阀和空气过滤器，富氧回收低压缓冲罐连接有富氧气体压缩机或射流泵，富氧气体压缩机或射流泵均与气动薄膜切断阀连接；变压吸附制氮装置中至少设置有两个吸附塔，吸附塔的进气口都通过管道连通压缩空气入口，吸附塔顶部出气口都连通有产品氮气管道。在不影响变压吸附制氮装置正常产氮气的情况下，可以有效地回收附产的富氧气体；间断排放的富氧气体可以通过本实用新型转变成连续输送，用于工业窑炉的助燃，降低燃料消耗；用于污水处理富氧曝气工艺，提高污水处理效率。该回收装置富氧回收低压缓冲罐，将将吸附塔再生过程中产生的氧气进行回收利用，虽然一定程度上避免了浪费，但是通过该装置回收的这部分再生过程中产生的氧气，因纯度不高，其使用范围受限。
实用新型内容
本实用新型所要解决的技术问题是，针对现有技术的不足，提供一种一体式连续制氧制氮装置，既解决了富氧空气的压力及组成波动问题，实现了氧气、氮气及液氮产品的连续稳定的生产，且氮气纯度在99.99mol%以上、氧气纯度在93mol%以上，同时解决了现有深冷制氮装置将富氧空气放空所造成的能量损失问题。
本实用新型解决上述技术问题所采用的技术方案为：一种一体式连续制氧制氮装置，包括生产氮气及液氮产品的深冷制氮装置和用于生产氧气产品的变压吸附制氧装置，所述的深冷制氮装置的富氧空气出口与一富氧空气缓冲罐的入口连接，所述的富氧空气缓冲罐的出口与所述的变压吸附制氧装置的入口连接，所述的变压吸附制氧装置的运行由一PLC控制系统控制。
本实用新型的一体式连续制氧制氮装置，将深冷制氮装置、富氧空气缓冲罐和变压吸附制氧装置依次串联，通过变压吸附制氧装置回收深冷制氮装置产生的副产品富氧空气，从而实现了氧气、氮气及液氮产品的同时生产。
本实用新型中深冷制氮装置采用现有技术。本实用新型利用现有深冷制氮技术的特点，通过深冷制氮装置同时生产氮气和液氮产品，且深冷制氮装置的副产品富氧空气通过富氧空气缓冲罐输送给变压吸附制氧装置。变压吸附技术的特性为产品的压力及组成波动较大，而本装置采用富氧空气缓冲罐可有效解决产品压力波动问题，保证进入变压吸附制氧装置的富氧空气流量、压力稳定，并提高装置的可靠性。
作为优选，所述的深冷制氮装置的富氧空气出口与所述的富氧空气缓冲罐的入口之间连接设置有富氧空气压缩机。由于深冷制氮装置的富氧空气的压力较低，在深冷制氮装置的富氧空气出口与富氧空气缓冲罐的入口之间增加富氧空气压缩机后，通过富氧空气压缩机可调节氧气产品的压力。
作为优选，所述的变压吸附制氧装置包括第一吸附塔、第二吸附塔、过滤器和氧气缓冲罐，所述的第一吸附塔和所述的第二吸附塔内均装有分子筛吸附剂，所述的第一吸附塔的顶部经第一出口阀与所述的过滤器的入口连接，所述的第二吸附塔的顶部经第二出口阀与所述的过滤器的入口连接，所述的第一吸附塔的顶部与所述的第二吸附塔的顶部经第一均压阀连接，所述的第一吸附塔的底部经第一入口阀与所述的富氧空气缓冲罐的出口连接，所述的第二吸附塔的底部经第二入口阀与所述的富氧空气缓冲罐的出口连接，所述的第一吸附塔的底部与所述的第二吸附塔的底部经第二均压阀连接，所述的第一吸附塔的底部经第一解吸阀与一排气管连接，所述的第二吸附塔的底部经第二解吸阀与所述的排气管连接。变压吸附制氧装置以分子筛为吸附剂，在一定压力下，利用空气中氧气和氮气分子在吸附剂表面吸附量的差异，在一定时间内氮在吸附相富集，氧在气体相富集，实现氧、氮分离。
作为优选，所述的深冷制氮装置包括依次连接的空气过滤器、空气压缩机、空气预冷系统、分子筛纯化器和冷箱，所述的冷箱的富氧空气出口与所述的富氧空气缓冲罐的入口连接，所述的空气过滤器用于除去空气中的机械杂质，所述的空气压缩机用于将空气压缩至所需压力，所述的空气预冷系统用于将空气冷却至较低温度，所述的分子筛纯化器用于除去空气中的CO2和H2O，所述的冷箱用于通过热交换及精馏分离产生氮气、液氮产品并副产富氧空气。
与现有技术相比，本实用新型具有如下优点：本实用新型公开的一体式连续制氧制氮装置，将深冷制氮装置、富氧空气缓冲罐和变压吸附制氧装置依次串联，既解决了富氧空气的压力及组成波动问题，实现了氧气、氮气及液氮产品的连续稳定的生产，同时解决了现有深冷制氮装置将富氧空气放空所造成的能量损失问题。本实用新型一体式连续制氧制氮装置生产的氮气、氧气纯度高（氮气纯度在99.99mol%以上，氧气纯度在93mol%以上），并能同时生产液氮产品，应用范围大。
附图说明
图1为实施例中一体式连续制氧制氮装置的结构连接示意图。
具体实施方式
以下结合附图实施例对本实用新型作进一步详细描述。
实施例1的一体式连续制氧制氮装置，如图1所示，包括生产氮气及液氮产品的深冷制氮装置A和用于生产氧气产品的变压吸附制氧装置B，深冷制氮装置A的富氧空气出口与一富氧空气缓冲罐C的入口连接，富氧空气缓冲罐C的出口与变压吸附制氧装置B的入口连接，变压吸附制氧装置B的运行由一PLC控制系统控制。
实施例1中，深冷制氮装置A采用现有技术。变压吸附制氧装置B包括第一吸附塔1、第二吸附塔2、过滤器3和氧气缓冲罐4，第一吸附塔1和第二吸附塔2内均装有分子筛吸附剂，第一吸附塔1的顶部经第一出口阀51与过滤器3的入口连接，第二吸附塔2的顶部经第二出口阀52与过滤器3的入口连接，第一吸附塔1的顶部与第二吸附塔2的顶部经第一均压阀53连接，第一吸附塔1的底部经第一入口阀54与富氧空气缓冲罐C的出口连接，第二吸附塔2的底部经第二入口阀55与富氧空气缓冲罐C的出口连接，第一吸附塔1的底部与第二吸附塔2的底部经第二均压阀56连接，第一吸附塔1的底部经第一解吸阀57与一排气管59连接，第二吸附塔2的底部经第二解吸阀58与排气管59连接。
实施例2的一体式连续制氧制氮装置，与实施例1的区别在于，实施例2中，深冷制氮装置A包括依次连接的空气过滤器6、空气压缩机7、空气预冷系统8、分子筛纯化器9和冷箱10，空气过滤器6、空气压缩机7、空气预冷系统8、分子筛纯化器9和冷箱10均采用现有技术，冷箱10的富氧空气出口11经富氧空气压缩机12与富氧空气缓冲罐C的入口连接，空气过滤器6用于除去空气中的机械杂质，空气压缩机7用于将空气压缩至所需压力，空气预冷系统8用于将空气冷却至较低温度，分子筛纯化器9用于除去空气中的CO2和H2O，冷箱10用于通过热交换及精馏分离产生氮气、液氮产品并副产富氧空气。
以实施例2的一体式连续制氧制氮装置为例，其深冷制氮装置A的工作原理为：常压空气经空气过滤器6除去机械杂质后进入空气压缩机7，压缩至所需压力后，通过空气预冷系统8后，冷却至约12℃，再通过分子筛纯化器9除去CO2和H2O等杂质后进入冷箱10，在冷箱10内经过热交换及精馏分离产生氮气、液氮产品并副产富氧空气。来自冷箱10的富氧空气出口11的富氧空气经富氧空气压缩机12压缩并经富氧空气缓冲罐C稳压后后进入变压吸附制氧装置B。
变压吸附制氧装置B的工作原理为：
PLC控制系统控制变压吸附制氧装置B的运行，使第一吸附塔1和第二吸附塔2循环交替，吸附、均压、解吸、吹扫四个工序完成一个循环。富氧空气从第一吸附塔1的底部进入第一吸附塔1中，氮气被分子筛吸附，未被吸附的氧气从第一吸附塔1的顶部出口经过过滤器3进入氧气缓冲罐4后作为氧气产品排出，第一吸附塔1中的分子筛吸附饱和后，停止吸附，并对第二吸附塔2进行短暂的均压过程，第一出口阀51、第二出口阀52、第一入口阀54和第二入口阀55关闭，第一均压阀53和第二均压阀56打开，气体分别从第一吸附塔1的进出口通过第一均压阀53和第二均压阀56均压到第二吸附塔2，使第一吸附塔1、第二吸附塔2的压力达到平衡。均压完成后，第一吸附塔1通过底部第一解吸阀57向排气管59排气，将第一吸附塔1的压力迅速降至常压，从而脱出已吸附的氮气，实现分子筛的解吸再生。为了使第一吸附塔1内的分子筛彻底再生，从第二吸附塔2的顶部出口引出一股产品氧气从第一吸附塔1的顶部出口进入第一吸附塔1，对第一吸附塔1进行逆流吹扫。
在第一吸附塔1吸附产氮的同时，第二吸附塔2进行再生（即解吸和吹扫）过程，第一吸附塔1、第二吸附塔2交替进行吸附、均压和再生，完成氧氮分离，连续输出氧气。
经检测，得到的氮气纯度在99.99mol%以上，氧气纯度在93mol%以上。

Claims (4)

1.一种一体式连续制氧制氮装置，其特征在于包括生产氮气及液氮产品的深冷制氮装置和用于生产氧气产品的变压吸附制氧装置，所述的深冷制氮装置的富氧空气出口与一富氧空气缓冲罐的入口连接，所述的富氧空气缓冲罐的出口与所述的变压吸附制氧装置的入口连接，所述的变压吸附制氧装置的运行由一PLC控制系统控制。
2.根据权利要求1所述的一种一体式连续制氧制氮装置，其特征在于所述的深冷制氮装置的富氧空气出口与所述的富氧空气缓冲罐的入口之间连接设置有富氧空气压缩机。
3.根据权利要求1所述的一种一体式连续制氧制氮装置，其特征在于所述的变压吸附制氧装置包括第一吸附塔、第二吸附塔、过滤器和氧气缓冲罐，所述的第一吸附塔和所述的第二吸附塔内均装有分子筛吸附剂，所述的第一吸附塔的顶部经第一出口阀与所述的过滤器的入口连接，所述的第二吸附塔的顶部经第二出口阀与所述的过滤器的入口连接，所述的第一吸附塔的顶部与所述的第二吸附塔的顶部经第一均压阀连接，所述的第一吸附塔的底部经第一入口阀与所述的富氧空气缓冲罐的出口连接，所述的第二吸附塔的底部经第二入口阀与所述的富氧空气缓冲罐的出口连接，所述的第一吸附塔的底部与所述的第二吸附塔的底部经第二均压阀连接，所述的第一吸附塔的底部经第一解吸阀与一排气管连接，所述的第二吸附塔的底部经第二解吸阀与所述的排气管连接。
4.根据权利要求1所述的一种一体式连续制氧制氮装置，其特征在于所述的深冷制氮装置包括依次连接的空气过滤器、空气压缩机、空气预冷系统、分子筛纯化器和冷箱，所述的冷箱的富氧空气出口与所述的富氧空气缓冲罐的入口连接，所述的空气过滤器用于除去空气中的机械杂质，所述的空气压缩机用于将空气压缩至所需压力，所述的空气预冷系统用于将空气冷却至较低温度，所述的分子筛纯化器用于除去空气中的CO2和H2O，所述的冷箱用于通过热交换及精馏分离产生氮气、液氮产品并副产富氧空气。
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