CN1068050C - 向气体消耗装置供气的方法及设备 - Google Patents

向气体消耗装置供气的方法及设备 Download PDF

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CN1068050C
CN1068050C CN97121398A CN97121398A CN1068050C CN 1068050 C CN1068050 C CN 1068050C CN 97121398 A CN97121398 A CN 97121398A CN 97121398 A CN97121398 A CN 97121398A CN 1068050 C CN1068050 C CN 1068050C
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air
gas
delivered
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consumption device
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CN1186862A (zh
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迪迪尔·马格尼特
埃马纽埃尔·加尼耶
贝马尔德·索尔尼耶
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LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
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    • F25J3/04957—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network and inter-connecting equipments upstream of the fractionation unit (s), i.e. at the "front-end"
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Abstract

一种气体消耗装置(HF)，它的一部分供气通过一个压缩装置(21)直接送来的气流供给，一部分供气通过一个分离装置(25)送来的气供给，分离装置(25)自身由压缩装置直接送来的气供给。分离装置产生的低压的其它气流在送到消耗装置之前返回到压缩装置中。

Description

向气体消耗装置供气的方法及设备
本发明涉及一种向气体消耗装置供气的方法和设备，尤其是一种消耗低温蒸馏分离空气装置产生的气体的消耗装置。
图1表示了向高炉供气的传统方法。空气被送到压缩机3然后到一个低温分离装置5。其产生的氧气被压缩机7压缩后与鼓风机1送来的空气在被送入高炉HF之前混合。
文献JP139609(1986)描述了一个系统(图2)，其中气体分离装置5由高炉HF的鼓风机1送来的富氧空气来供气。该低压分离装置产生的氧气4被送到鼓风机的进口处。
该系统仅可能利用分离装置产生的单一压力下的气体。
另外，产生的氧气的一部分在空气回收装置中再循环，因此在一个环路中循环，这使得必须增大设备的尺寸并且也增大了能量消耗。
本发明的目的是克服已知方法和设备的缺点。
本发明提供一种向空气消耗装置(HF)供气的方法，包括：
ⅰ)构成气体混合物的供气流在一个压缩装置中被压缩；
ⅱ)被压缩的混合物的第一部分送到消耗装置(HF)；
ⅲ)被压缩的混合物的第二部分送到一个分离装置，它把混合物分离成两股气流，其中一股气流的压力比另一股高；
ⅳ)压力较高的气流送到气体消耗装置(HF)，同时可选择地与压缩混合物的第一部分混合；
ⅴ)另一股气流送到至少一个压缩装置中，并且压缩后的气体送到至少一个气体消耗装置(HF,HF2,HF3)中。
本发明的另一目的是提供：
-一种方法，其中供应气流是空气，而分离装置产生的气体是浓缩的氮气或氧气；
－一种方法，其中所述的两股气流送到同一个气体消耗装置(HF)中；
-另一种方法，其中气体消耗设备(HF)是一个消耗富氧空气的高炉。
本发明还提供一种向气体消耗装置(HF)供气的设备，它包括：
一个压缩装置，一个气体消耗装置，一个分离气体混合物的装置25，将气体混合物送到压缩装置的设施，将压缩后的混合物的第一部分送到气体消耗装置的设施，将压缩后的混合物的第二部分送到分离装置的设施，将压力较高和第一股气流送到气体消耗装置(HF,HF1)的设施，和将第二股气流送到至少一个压缩装置并接着到至少一个气体消耗装置(HF,HF2,HF3)的设施。
本发明可以适用于这里描述的情况之外的其它用途。气体消耗装置可以消耗除了氧气之外的其它气体，例如氮气或氢气。分离装置也因此能产生不同压力的氮气和氢气。
图3到8表示了本发明的不同实施例。
图3中，每小时向鼓风机21输送200,000m3(标准温度和压力下，stp)空气。需要向高炉HF供应含氧25％的浓缩空气，这相当于每天350t纯氧的量。被鼓风机21压缩的气流22分成两股，第一部分28被送到高炉HF，而流量为每小时50,000m3(stp)的第二部分23被送到一个蒸馏装置25，它具有两个以传统方式热连接在一起的蒸馏塔。
这一装置每天产生120t低压氧和230t中压氧。中压氧与气流28混合，低压氧在鼓风机21中被压缩。
在图4中不同的是，图3中的高炉使用同样的空气分离装置来供气，但是使用了两个鼓风机21、21A，其中一个鼓风机21向分离装置25和消耗装置供气，而另一个鼓风机21A用来压缩低压的富氧空气。
用这种方式，空气可以被不同尺寸的鼓风机压缩；这些鼓风机中只有一种需要安全措施来避免由于氧气浓度带来的问题。因此，鼓风机21A每小时压缩富氧空气98,300m’(stp)，而鼓风机21每小时压缩空气145,000m3(stp)，其中每小时向装置25输送空气50,000m3(stp)(气流23)。该装置每小时产生低压氧气3300m3(stp)，它再循环到鼓风机21A并在那里被压缩，且每小时产生中压氧气6700m3(stp)(气流24)。混合的气流28和24构成高炉所需的富氧空气200,000m3/小时(stp)。
压缩后的气流22分成两股，第一部分28送到一个高炉HF中而第二部分23送到一个双塔蒸馏装置25中。该蒸馏装置产生与气流28混合的中压氧气24和将在鼓风机21中压缩的低压氧气26。含氧23％的浓缩空气这样被送到高炉中。
在图4中不同的是有两个鼓风机21、21A向高炉供气。低压氧气26再循环到鼓风机21A，而只有鼓风机21把空气送到分离装置25。
在图5中不同的是，低压氧气分开两支气流36、37，每一支都通过一台相应的鼓风机38、39压缩并送到一个相应的高炉HF2、HF3。空气流也送到压缩机38、39。
分离装置25也可以通过一个压缩机51送来的空气流来供气(见图6)。
中压氧气可以通过液态流的气化来产生，可选择在一个混合塔中(直接热交换)，或在热交换器中逆着该装置供应气流的一部分(间接热交换)。
本发明还适用于消耗除氧气以外的其它气体，及消耗富氧空气的其它装置，例如在玻璃炉和铜冶金装置中。
分离装置产生的其它气体，例如氮气，也可以输送到本发明的压缩气体消耗装置中。
图7中，压缩到中压塔压力的空气71被分成三部分。第一部分71A直接送到中压塔中。第二部分71B在压缩机75中压缩，在热交换线路73中液化膨胀后送到中压塔中。第三部分71C在鼓风叶轮机77中膨胀然后送到低压塔中。液态氧被从低压塔中抽出，被泵输送到热交换线路73中并气化。
图8和图7除了空气鼓风叶轮机被替代为中压氮气叶轮机81之外，其它元件相同。压缩后的空气71B液化并分成两部分，其中一个送到中压塔而另一个送到低压塔。

Claims (12)

1、向气体消耗装置(HF)供气的方法，包括：
ⅰ)构成气体混合物的供气流在一个压缩装置(21)中被压缩；
ⅱ)被压缩的混合物的第一部分(28)送到消耗装置(HF)；
ⅲ)被压缩的混合物的第二部分(23)送到一个分离装置(25)，它把混合物分离成两股气流，其中一股气流的压力比另一股高；
ⅳ)压力较高的气流(24)送到气体消耗装置(HF)，同时可选择地与压缩混合物的第一部分(28)混合；
ⅴ)另一股气流(26)送到一个压缩装置(21)中，并且压缩后的气体送到至少一个气体消耗装置(HF,HF2,HF3)中。
2、如权利要求1所述的方法，其中供应气流是空气，而分离装置产生的气体是浓缩的氮气或氧气。
3、如权利要求1或2所述的方法，其中所述的两股气流送到同一气体消耗装置(HF)中。
4、如权利要求1至3之一所述的方法，其中气体消耗装置(HF)由至少两股分别由鼓风机(21,21A)组成的压缩装置分别压缩的供气流来供气。
5、如权利要求4所述的方法，其中第一鼓风机(21A)由其它气流(26)供气，而供气流被第二鼓风机(21)压缩的那部分送到分离装置(25)。
6、如权利要求1至3之一所述的方法，其中分离装置(25)也由通过空气压缩机(51)送来的空气供气。
7、如权利要求1至3之一所述的方法，其中压力较高的气体在该装置(25)中通过直接或间接热交换使液体气化来产生，并可选择地与压缩气体流混合。
8、如权利要求1至3之一所述的方法，其中压力较高的气体被压缩到该压力。
9、如权利要求8所述的方法，其中空气或较高压力的气体通过分离装置(25)的一个膨胀叶轮机驱动的压缩机来压缩。
10、如权利要求1至3之一所述的方法，其中分离装置(25)是一个低温蒸馏装置。
11、如权利要求1至3之一所述的方法，其中气体消耗装置(HF)是一个消耗富氧空气的高炉。
12、向气体消耗装置(HF)供气的设备，包括：
一个压缩装置(21)，一个气体消耗装置，一个分离气体混合物的装置(25)，将气体混合物送到压缩装置的设施，将压缩后的混合物的第一部分送到气体消耗装置的设施(22,28)，将压缩后的混合物的第二部分送到装置(25)的设施(23)，将压力较高的第一股气流送到气体消耗装置(HF,HF1)的设施(24)，和将第二股气流送到至少一个压缩装置(26,38,39)并接着到至少一个气体消耗装置(HF,HF2,HF3)的设施(36,38)。
CN97121398A 1996-09-25 1997-09-25 向气体消耗装置供气的方法及设备 Expired - Fee Related CN1068050C (zh)

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