CN112628593B - 一种液氢蒸发气处理系统及其控制方法 - Google Patents
一种液氢蒸发气处理系统及其控制方法 Download PDFInfo
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- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 277
- 239000001257 hydrogen Substances 0.000 title claims abstract description 277
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 271
- 239000007789 gas Substances 0.000 title claims abstract description 123
- 239000007788 liquid Substances 0.000 title claims abstract description 113
- 238000001704 evaporation Methods 0.000 title claims abstract description 32
- 230000008020 evaporation Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 22
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims description 73
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 239000005431 greenhouse gas Substances 0.000 description 1
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Abstract
本发明提供一种液氢蒸发气处理系统及其控制方法,实现对液氢运输船中液氢蒸发气的合理引导及利用,液氢储存罐中的蒸发气经多级氢气压缩机压缩后,可以储存在氢气日用罐供给日用设备,也可以储存在压缩氢气高压储罐中,避免蒸发气直接排到大气中造成损耗,而且无需昂贵的液化设备,大大降低了船舶造价。其中压缩氢气高压储罐同时兼有储存和供给的缓冲功能,压缩氢气高压储罐储存的蒸发气既可以供给氢气日用罐,又可以供给液氢储存罐,对维持整个系统的稳定起到了关键性作用。控制单元实现对整个系统的实时调控,配合压缩氢气高压储罐使液氢储存罐和氢气日用罐的内部压力始终保持稳定,大大提升了船舶运输中的安全性和稳定性,具有极高的实用价值。
Description
技术领域
本发明涉及液氢运输船领域,特别涉及一种液氢蒸发气处理系统及其控制方法。
背景技术
随着能源危机和环境污染的日渐严重,2018年4月,IMO制定了关于温室气体减排的战略。氢气作为一种不含碳的清洁能源,是目前倍受航运业关注和极力开发的新燃料之一。液氢运输船及氢燃料动力船等新概念船舶也随之应运而生,成为业界的热门研究方向。而其中最关键的一点就是如何对液氢进行储存和输运。
氢气在船上的储存通常以常压全冷(-253℃)液态的形式储存于液氢储存罐中。在装货、加注、运输过程中,超低温的液氢由于热量的浸入往往会产生蒸发气,为了避免货损,必须要对这些蒸发气加以限制和回收。通常有两种处理思路,一是将蒸发气引导排出储存罐后进行再液化处理,但是由于蒸发气的液化温度极低,将蒸发气进行再液化的液化设备极其昂贵;二是将这些蒸发气限制在液氢储存罐中而不被排出,但这样必定会增大储存罐的内部压力,造成安全隐患,如果一味的增加储存罐的设计压力,那么船舶的造价成本也会大幅度提高。此外上述限制和回收的方法缺少调控功能,很难使储存罐中的压力保持稳定。
因此,有必要提出一种新的液氢蒸发气处理系统及其控制方法,对蒸发气进行合理的引导和利用。
发明内容
基于以上现有技术中处理液氢蒸发气的不足和缺陷,本发明提供一种液氢蒸发气处理系统,包括:
液氢储存罐,储存液态氢的低温容器;
多级氢气压缩机,对来自所述液氢储存罐中的蒸发气进行压缩;
压缩氢气高压储罐,对所述多级氢气压缩机压缩后的蒸发气进行储存,并且通过压力调节单元连通所述液氢储存罐和氢气日用罐;
控制单元,对整个系统进行监测和控制。
具体地,所述压缩氢气高压储罐和所述液氢储存罐之间设有第一压力调节单元,用于调控所述压缩氢气高压储罐进入所述液氢储存罐的蒸发气气压和流量。
具体地,所述液氢储存罐内安装有第一压力传感器。
具体地,所述液氢储存罐和多级氢气压缩机之间设有气液分离器和气体加热器,气液分离器安装在液氢储存罐的出口用于蒸发气的气液分离,分离掉不可压缩的液体;气体加热器对气液分离器分离出的蒸发气进行加热,使蒸发气的温度达到多级氢气压缩机可接受的温度。
具体地,所述多级氢气压缩机还设有级间出口,以满足不同的压力输出需求,为氢气日用罐提供较低压力的蒸发气。
具体地,所述液氢蒸发气处理系统还包括所述氢气日用罐,储存来自所述级间出口和所述压缩氢气高压储罐的蒸发气。
具体地,所述氢气日用罐内安装有第二压力传感器。
具体地,所述压缩氢气高压储罐和所述氢气日用罐之间设有第二压力调节单元,用于调控所述压缩氢气高压储罐进入所述氢气日用罐的蒸发气气压和流量。
具体地,所述液氢蒸发气处理系统还包括日用设备,所述日用设备的氢能供给来自所述氢气日用罐,所述日用设备包括内燃机、燃料电池和燃气轮机。
可选地,所述第一压力调节单元和第二压力调节单元包括减压阀和压力调节阀。
可选地,所述液氢蒸发气处理系统还包括状态显示单元,用以显示各部件的运行状态、液氢储存罐的压力、氢气日用罐的压力等信息,为船员提供参考。
具体地,所述控制单元接收来自所述第一压力传感器、第二压力传感器、多级氢气压缩机、第一压力调节单元、第二压力调节单元的输入信号,并将控制信号输出至状态显示单元、多级氢气压缩机、第一压力调节单元、第二压力调节单元。
可选地,所述压缩氢气高压储罐的设计压力为700公斤。
本发明还提供一种使用上述液氢蒸发气处理系统调控液氢储存罐压力的方法,包括以下步骤:
S10:设定液氢储存罐保持稳定时的压力值为设定值,将该设定值读入控制单元;
S11:控制单元判断第一压力传感器的压力值相比设定值偏大或是偏小;
S12:根据S11中的判断结果,控制单元按照优先级高低对第一压力调节单元和多级氢气压缩机进行调控,直至第一压力传感器的压力值恢复至设定值。
具体地,当步骤S11中判断第一压力传感器的压力值相比设定值偏大时,S12具体包括以下步骤:
S12-1:对第一压力调节单元进行调控,减少压缩氢气高压储罐至液氢储存罐中的蒸发气输入量;
S12-2:在执行S12-1的同时,判断第一压力传感器的压力值是否降低至设定值,当第一压力传感器的压力值已降低至设定值,则停止步骤S12-1,结束步骤S12;当执行步骤S12-1直至压缩氢气高压储罐至液氢储存罐中的蒸发气输入量减小为0、且第一压力传感器的压力值仍未降低至设定值,则执行步骤S12-3;
S12-3:提升多级氢气压缩机的工作负荷,将液氢储存罐中的蒸发气抽出液氢储存罐,直至第一压力传感器的压力值降低至设定值。
具体地,当步骤S11中判断第一压力传感器的压力值相比设定值偏小时,S12具体包括以下步骤:
S12-1:对多级氢气压缩机进行调控,降低多级氢气压缩机的工作负荷,减少从液氢储存罐中抽出的蒸发气;
S12-2:在执行S12-1的同时,判断第一压力传感器的压力值是否升高至设定值,当第一压力传感器的压力值已升高至设定值,则停止步骤S12-1,结束步骤S12;当执行步骤S12-1直至多级氢气压缩机的工作负荷减小为0、且第一压力传感器的压力值仍未升高至设定值,则执行步骤S12-3;
S12-3:对第一压力调节单元进行调控,增加压缩氢气高压储罐至液氢储存罐中的蒸发气输入量,直至第一压力传感器的压力值升高至设定值。
本发明还提供一种使用上述液氢蒸发气处理系统调控氢气日用罐压力的方法,包括以下步骤:
S20:设定氢气日用罐保持稳定时的压力值为设定值,将该设定值读入控制单元;
S21:控制单元判断第二压力传感器的压力值相比设定值偏大或是偏小;
S22:根据S21中的判断结果,控制单元按照优先级高低对第二压力调节单元和多级氢气压缩机进行调控,直至第二压力传感器的压力值恢复至设定值。
具体地,当步骤S21中判断第二压力传感器的压力值相比设定值偏小时,S22具体包括以下步骤:
S22-1:增大多级氢气压缩机通过级间出口进入氢气日用罐的蒸发气量,减少多级氢气压缩机进入压缩氢气高压储罐的蒸发气量;
S22-2:在执行S22-1的同时,判断第二压力传感器的压力值是否升高至设定值,当第二压力传感器的压力值已升高至设定值,则停止步骤S22-1,结束步骤S22;当执行步骤S22-1直至多级氢气压缩机输出的蒸发气全部用于供给氢气日用罐、且第二压力传感器的压力值仍未升高至设定值,则执行步骤S22-3;
S22-3:对第二压力调节单元进行调控,增加压缩氢气高压储罐至氢气日用罐中的蒸发气输入量,直至第二压力传感器的压力值升高至设定值。
具体地,当步骤S21中判断第二压力传感器的压力值相比设定值偏大时,S22具体包括以下步骤:
S22-1:对第二压力调节单元进行调控,减少压缩氢气高压储罐至氢气日用罐中的蒸发气输入量;
S22-2:在执行S22-1的同时,判断第二压力传感器的压力值是否降低至设定值,当第二压力传感器的压力值已降低至设定值,则停止步骤S22-1,结束步骤S22;当执行步骤S22-1直至压缩氢气高压储罐至氢气日用罐中的蒸发气输入量减小为0、且第二压力传感器的压力值仍未降低至设定值,则执行步骤S22-3;
S22-3:减少多级氢气压缩机通过级间出口进入氢气日用罐的蒸发气量,使多级氢气压缩机输出的蒸发气更多地进入压缩氢气高压储罐,直至第二压力传感器的压力值降低至设定值。
如上所述,本发明提供的液氢蒸发气处理系统及其控制方法,具有如下有益技术效果:本系统实现对液氢运输船中液氢蒸发气的合理引导及利用,液氢储存罐中的蒸发气经多级氢气压缩机压缩后,可以储存在氢气日用罐供给日用设备,也可以储存在压缩氢气高压储罐中,避免了蒸发气直接排到大气中造成损耗,而且无需昂贵的液化设备,大大降低了船舶造价。其中压缩氢气高压储罐同时兼有储存和供给的缓冲功能,压缩氢气高压储罐储存的蒸发气既可以供给氢气日用罐,又可以供给液氢储存罐,对维持整个系统的稳定起到了关键性作用。控制单元实现对整个系统的实时调控,配合压缩氢气高压储罐使液氢储存罐和氢气日用罐的内部压力始终保持稳定,大大提升了船舶运输中的安全性和稳定性。此外,在控制单元实时调控中通过设定优先级高低的方法,使各部件协调有序的运行,从而实现高效有序的调控。
附图说明
图1显示为本处理系统的部件连接示意图。
图2显示为本处理系统的蒸发气流向示意图。
图3显示为本处理系统控制单元的输入信号及输出信号示意图。
图4显示为本处理系统调控液氢储存罐压力的流程示意图
图5显示为本处理系统调控氢气日用罐压力的流程示意图
元件标号说明
1 液氢储存罐
2 第一压力传感器
3 气液分离器
4 气体加热器
5 多级氢气压缩机
6 级间出口
7 压缩氢气高压储罐
8 第一压力调节单元
9 第二压力调节单元
10 控制单元
11 第二压力传感器
12 氢气日用罐
13 状态显示单元
14 内燃机
15 燃料电池
16 燃气轮机
具体实施方式
以下通过特定的具体实例说明本发明的实施方式,本领域技术人员可由本说明书所揭露的内容轻易地了解本发明的其它优点与功效。本发明还可以通过另外不同的具体实施方式加以实施或应用,本说明书中的各项细节也可以基于不同观点与应用,在没有背离本发明的精神下进行各种修饰或改变。
本实施例提供一种液氢蒸发气处理系统,如图1所示,该处理系统具体包括以下部件:
液氢储存罐1,储存液态氢的低温容器,以常压全冷(-253℃)液态形式储存氢气,是液氢的原始储存位置;
第一压力传感器2,安装在液氢储存罐1内部,用于监控液氢储存罐1的内部压力;
气液分离器3,安装在液氢储存罐1的出口用于蒸发气的气液分离,分离掉不可压缩的液体;
气体加热器4,对气液分离器3分离出的蒸发气进行加热,使蒸发气的温度达到多级氢气压缩机5可接受的温度;
多级氢气压缩机5,对气体加热器4加热后的蒸发气进行压缩,同时设有级间出口6,以满足不同的压力输出需求;
级间出口6,设置在多级氢气压缩机5上,为氢气日用罐12提供较低压力的蒸发气;
压缩氢气高压储罐7,对来自多级氢气压缩机5压缩后的蒸发气进行储存,罐内的蒸发气也可以提供给液氢储存罐1或氢气日用罐12;
第一压力调节单元8,包括减压阀和压力调节阀,用于降低来自压缩氢气高压储罐7的蒸发气气压,同时控制蒸发气从压缩氢气高压储罐7进入液氢储存罐1的流量;
第二压力调节单元9,包括减压阀和压力调节阀,用于降低来自压缩氢气高压储罐7的蒸发气气压,同时控制蒸发气从压缩氢气高压储罐7进入氢气日用罐12的流量;
第二压力传感器11,安装在压缩氢气高压储罐7的内部,用于监控压缩氢气高压储罐7 的内部压力;
氢气日用罐12,储存来自多级氢气压缩机5和/或压缩氢气高压储罐7的蒸发气,并提供给内燃机14、燃料电池15、燃气轮机16等日用设备;
状态显示单元13,显示各部件的运行状态、液氢储存罐1的压力、氢气日用罐12的压力等信息,为船员提供参考;
内燃机14,将来自氢气日用罐12中蒸发气燃料的能量转化为动力机械能;
燃料电池15,将来自氢气日用罐12中蒸发气燃料的能量转换成电能;
燃气轮机16,将来自氢气日用罐12中蒸发气燃料的能量转化为动力机械能;
控制单元10,对整个系统进行监测和控制,控制各部件的协调运转。
如图1-2所示为蒸发气流向的示意图,从液氢储存罐1中产生的蒸发气先经气液分离器3 将蒸发气中混杂的液体杂志等过滤掉,过滤后的蒸发气经气体加热器4加热,使蒸发气的温度达到多级氢气压缩机5可接受的温度,之后蒸发气进入多级氢气压缩机5,多级氢气压缩机5对这些蒸发气进行压缩处理,压缩后的蒸发气可以经过压缩机的级间出口6直接进入氢气日用罐12,也可以经过多级压缩后进入压缩氢气高压储罐7进行储存。压缩氢气高压储罐 7中储存的蒸发气也有两种流向选择,可以供给氢气日用罐12,也可以返回液氢储存罐1中用以维持液氢储存罐1中的压力。氢气日用罐12中储存的蒸发气可以用于内燃机14、燃料电池15、燃气轮机16等日用设备。
具体地,控制单元10实现对整个系统的监测和控制,如图3所示,控制单元10接收来自第一压力传感器2、第二压力传感器11、多级氢气压缩机5、第一压力调节单元8、第二压力调节单元9的输入信号。经过运算处理后,将控制信号输出至状态显示单元13、多级氢气压缩机5、第一压力调节单元8、第二压力调节单元9,控制各部件的协调运转。
当检测到输入信号出现异常时,控制单元会通过输出信号对各部件的运行状态进行调控,直至输入信号的状态恢复正常。
该液氢蒸发气处理系统中控制单元调控液氢储存罐1压力的工作原理和调控方法为:
S10:设定液氢储存罐1保持稳定时的压力值为设定值,将该设定值读入控制单元10;
S11:控制单元10判断第一压力传感器2的压力值相比设定值偏大或是偏小;
S12:根据S11中的判断结果,控制单元10按照优先级高低对第一压力调节单元8和多级氢气压缩机5进行调控,直至第一压力传感器2的压力值恢复至设定值。
具体地,如图4所示,当步骤S11中判断第一压力传感器2的压力值相比设定值偏大时, S12具体包括以下步骤:
S12-1:对第一压力调节单元8进行调控,减少压缩氢气高压储罐7至液氢储存罐1中的蒸发气输入量;
S12-2:在执行S12-1的同时,判断第一压力传感器2的压力值是否降低至设定值,当第一压力传感器2的压力值已降低至设定值,则停止步骤S12-1,结束步骤S12;当执行步骤S12-1直至压缩氢气高压储罐7至液氢储存罐1中的蒸发气输入量减小为0、且第一压力传感器2的压力值仍未降低至设定值,则执行步骤S12-3;
S12-3:提升多级氢气压缩机5的工作负荷,将液氢储存罐1中的蒸发气抽出液氢储存罐1,直至第一压力传感器2的压力值降低至设定值。
具体地,如图4所示,当步骤S11中判断第一压力传感器2的压力值相比设定值偏小时, S12具体包括以下步骤:
S12-1:对多级氢气压缩机5进行调控,降低多级氢气压缩机5的工作负荷,减少从液氢储存罐1中抽出的蒸发气;
S12-2:在执行S12-1的同时,判断第一压力传感器2的压力值是否升高至设定值,当第一压力传感器2的压力值已升高至设定值,则停止步骤S12-1,结束步骤S12;当执行步骤S12-1直至多级氢气压缩机5的工作负荷减小为0、且第一压力传感器2的压力值仍未升高至设定值,则执行步骤S12-3;
S12-3:对第一压力调节单元8进行调控,增加压缩氢气高压储罐7至液氢储存罐1中的蒸发气输入量,直至第一压力传感器2的压力值升高至设定值。
该液氢蒸发气处理系统中控制单元调控氢气日用罐12压力的工作原理和调控方法为:
S20:设定氢气日用罐12保持稳定时的压力值为设定值,将该设定值读入控制单元10;
S21:控制单元10判断第二压力传感器11的压力值相比设定值偏大或是偏小;
S22:根据S21中的判断结果,控制单元按照优先级高低对第二压力调节单元9和多级氢气压缩机5进行调控,直至第二压力传感器11的压力值恢复至设定值。
具体地,如图5所示,当步骤S21中判断第二压力传感器11的压力值相比设定值偏小时,S22具体包括以下步骤:
S22-1:增大多级氢气压缩机5通过级间出口6进入氢气日用罐12的蒸发气量,减少多级氢气压缩机5进入压缩氢气高压储罐7的蒸发气量;
S22-2:在执行S22-1的同时,判断第二压力传感器11的压力值是否升高至设定值,当第二压力传感器11的压力值已升高至设定值,则停止步骤S22-1,结束步骤S22;当执行步骤S22-1直至多级氢气压缩机5输出的蒸发气全部用于供给氢气日用罐 12、且第二压力传感器11的压力值仍未升高至设定值,则执行步骤S22-3;
S22-3:对第二压力调节单元9进行调控,增加压缩氢气高压储罐7至氢气日用罐12中的蒸发气输入量,直至第二压力传感器11的压力值升高至设定值。
具体地,如图5所示,当步骤S21中判断第二压力传感器11的压力值相比设定值偏大时,S22具体包括以下步骤:
S22-1:对第二压力调节单元9进行调控,减少压缩氢气高压储罐7至氢气日用罐12中的蒸发气输入量;
S22-2:在执行S22-1的同时,判断第二压力传感器11的压力值是否降低至设定值,当第二压力传感器11的压力值已降低至设定值,则停止步骤S22-1,结束步骤S22;当执行步骤S22-1直至压缩氢气高压储罐7至氢气日用罐12中的蒸发气输入量减小为0、且第二压力传感器11的压力值仍未降低至设定值,则执行步骤S22-3;
S22-3:减少多级氢气压缩机5通过级间出口6进入氢气日用罐12的蒸发气量,使多级氢气压缩机5输出的蒸发气更多地进入压缩氢气高压储罐7,直至第二压力传感器11的压力值降低至设定值。
上述实施例仅例示性说明本发明的原理及其功效,而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下,对上述实施例进行修饰或改变。因此,举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变,仍应由本发明的权利要求所涵盖。
Claims (6)
1.一种使用液氢蒸发气处理系统调控液氢储存罐压力的方法,其特征在于,所述液氢蒸发气处理系统包括:
液氢储存罐,储存液态氢的低温容器,所述液氢储存罐内安装有第一压力传感器;
多级氢气压缩机,对来自所述液氢储存罐中的蒸发气进行压缩;
压缩氢气高压储罐,对所述多级氢气压缩机压缩后的蒸发气进行储存,并且通过压力调节单元连通所述液氢储存罐和氢气日用罐,所述压力调节单元包括第一压力调节单元,所述第一压力调节单元设置在压缩氢气高压储罐和所述液氢储存罐之间,用于调控所述压缩氢气高压储罐进入所述液氢储存罐的蒸发气气压和流量;
控制单元,对整个系统进行监测和控制,所述控制单元接收来自所述第一压力传感器、多级氢气压缩机、第一压力调节单元的输入信号,并将控制信号输出至多级氢气压缩机、第一压力调节单元;
调控液氢储存罐压力的方法包括以下步骤:
S10: 设定液氢储存罐保持稳定时的压力值为设定值,将该设定值读入控制单元;
S11: 控制单元判断第一压力传感器的压力值相比设定值偏大或是偏小;
S12: 根据S11中的判断结果,控制单元按照优先级高低对第一压力调节单元和多级氢气压缩机进行调控,直至第一压力传感器的压力值恢复至设定值。
2.根据权利要求1所述调控液氢储存罐压力的方法,其特征在于,当步骤S11中判断第一压力传感器的压力值相比设定值偏大时,S12具体包括以下步骤:
S12-1: 对第一压力调节单元进行调控,减少压缩氢气高压储罐至液氢储存罐中的蒸发气输入量;
S12-2:在执行S12-1的同时,判断第一压力传感器的压力值是否降低至设定值,当第一压力传感器的压力值已降低至设定值,则停止步骤S12-1,结束步骤S12;当执行步骤S12-1直至压缩氢气高压储罐至液氢储存罐中的蒸发气输入量减小为0、且第一压力传感器的压力值仍未降低至设定值,则执行步骤S12-3;
S12-3: 提升多级氢气压缩机的工作负荷,将液氢储存罐中的蒸发气抽出液氢储存罐,直至第一压力传感器的压力值降低至设定值。
3.根据权利要求1所述调控液氢储存罐压力的方法,其特征在于,当步骤S11中判断第一压力传感器的压力值相比设定值偏小时,S12具体包括以下步骤:
S12-1: 对多级氢气压缩机进行调控,降低多级氢气压缩机的工作负荷,减少从液氢储存罐中抽出的蒸发气;
S12-2: 在执行S12-1的同时,判断第一压力传感器的压力值是否升高至设定值,当第一压力传感器的压力值已升高至设定值,则停止步骤S12-1,结束步骤S12;当执行步骤S12-1直至多级氢气压缩机的工作负荷减小为0、且第一压力传感器的压力值仍未升高至设定值,则执行步骤S12-3;
S12-3: 对第一压力调节单元进行调控,增加压缩氢气高压储罐至液氢储存罐中的蒸发气输入量,直至第一压力传感器的压力值升高至设定值。
4.一种使用液氢蒸发气处理系统调控氢气日用罐压力的方法,其特征在于,
所述液氢蒸发气处理系统包括:
液氢储存罐,储存液态氢的低温容器;
多级氢气压缩机,对来自所述液氢储存罐中的蒸发气进行压缩;
压缩氢气高压储罐,对所述多级氢气压缩机压缩后的蒸发气进行储存,并且通过压力调节单元连通所述液氢储存罐和氢气日用罐,所述压力调节单元包括第二压力调节单元,所述第二压力调节单元设置在压缩氢气高压储罐和所述氢气日用罐之间,用于调控所述压缩氢气高压储罐进入所述氢气日用罐的蒸发气气压和流量,所述氢气日用罐内安装有第二压力传感器;
控制单元,对整个系统进行监测和控制,所述控制单元接收来自所述第二压力传感器、多级氢气压缩机、第二压力调节单元的输入信号,并将控制信号输出至多级氢气压缩机、第二压力调节单元;
调控氢气日用罐压力的方法包括以下步骤:
S20: 设定氢气日用罐保持稳定时的压力值为设定值,将该设定值读入控制单元;
S21: 控制单元判断第二压力传感器的压力值相比设定值偏大或是偏小;
S22: 根据S21中的判断结果,控制单元按照优先级高低对第二压力调节单元和多级氢气压缩机进行调控,直至第二压力传感器的压力值恢复至设定值。
5.根据权利要求4所述调控氢气日用罐压力的方法,其特征在于,当步骤S21中判断第二压力传感器的压力值相比设定值偏小时,S22具体包括以下步骤:
S22-1:增大多级氢气压缩机进入氢气日用罐的蒸发气量,减少多级氢气压缩机进入压缩氢气高压储罐的蒸发气量;
S22-2:在执行S22-1的同时,判断第二压力传感器的压力值是否升高至设定值,当第二压力传感器的压力值已升高至设定值,则停止步骤S22-1,结束步骤S22;当执行步骤S22-1直至多级氢气压缩机输出的蒸发气全部用于供给氢气日用罐、且第二压力传感器的压力值仍未升高至设定值,则执行步骤S22-3;
S22-3:对第二压力调节单元进行调控,增加压缩氢气高压储罐至氢气日用罐中的蒸发气输入量,直至第二压力传感器的压力值升高至设定值。
6.根据权利要求4所述调控氢气日用罐压力的方法,其特征在于,当步骤S21中判断第二压力传感器的压力值相比设定值偏大时,S22具体包括以下步骤:
S22-1: 对第二压力调节单元进行调控,减少压缩氢气高压储罐至氢气日用罐中的蒸发气输入量;
S22-2: 在执行S22-1的同时,判断第二压力传感器的压力值是否降低至设定值,当第二压力传感器的压力值已降低至设定值,则停止步骤S22-1,结束步骤S22;当执行步骤S22-1直至压缩氢气高压储罐至氢气日用罐中的蒸发气输入量减小为0、且第二压力传感器的压力值仍未降低至设定值,则执行步骤S22-3;
S22-3: 减少多级氢气压缩机进入氢气日用罐的蒸发气量,使多级氢气压缩机输出的蒸发气更多地进入压缩氢气高压储罐,直至第二压力传感器的压力值降低至设定值。
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