CN108087050B - 一种综合利用lng冷能发电及供冷的系统 - Google Patents
一种综合利用lng冷能发电及供冷的系统 Download PDFInfo
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Abstract
本发明涉及一种综合利用LNG冷能发电及供冷的系统,包括LNG增压气化直接膨胀发电系统、混合工质朗肯循环发电系统,液氨冷库供冷系统,乙二醇蓄冰池空调供冷循环系统;利用LNG气化过程中释放的冷能,采用LNG增压气化直接膨胀发电和混合工质朗肯循环发电生产高品位的电能,氨回收LNG气化过程中释放的冷能对冷库供冷,乙二醇蓄冰池回收LNG气化过程中释放的冷能对空调供冷,该系统LNG冷能梯级利用,冷能利用效率高。
Description
技术领域
本发明涉及天然气低温冷能回收利用技术领域,具体地说,是一种综合利用LNG冷能发电及供冷的系统。
背景技术
液化天然气(LNG)以其运输方便、清洁环保、高效节能等特点逐渐成为主要能源之一,LNG气化时释放大量冷能,传统LNG气化工艺中,该部分冷能被空气或海水带走,大量的高品位冷能由此浪费。虽然目前LNG冷能回收利用的方案很多,但仍然存在冷能利用效率不高、LNG冷能未梯级利用、动设备较多、流程复杂等问题。
发明内容
本发明为了克服上述技术问题的不足,提供了一种综合利用LNG冷能发电及供冷的系统,可实现LNG冷能的梯级利用,生产高品位的电能,冷能利用效率高。
解决上述技术问题的技术方案如下:
一种综合利用LNG冷能发电及供冷的系统,包括LNG增压气化直接膨胀发电系统、混合工质朗肯循环发电系统,液氨冷库供冷系统,乙二醇蓄冰池空调供冷循环系统;
所述的LNG增压气化直接膨胀发电系统包括依次按梯级串接在天然气管道上的LNG增压泵、混合工质冷凝器、第一气氨冷凝器、第一乙二醇换热器和天然气透平膨胀机,所述的天然气透平膨胀机的动力输出端连接第一发电机,第一发电机的电力输出端接入电网,天然气透平膨胀机的天然气出口依次通过第二气氨冷凝器和第三乙二醇换热器的天然气管道通入界外;
所述的混合工质朗肯循环发电系统包括依次串接在混合工质管道上形成循环系统的混合工质冷凝器、混合工质增压泵、第二乙二醇换热器、混合工质空温复热器和混合工质透平膨胀机,混合工质透平膨胀机的动力输出端连接第二发电机,第二发电机的电力输出端接入电网;
所述的液氨冷库供冷系统包括第一气氨冷凝器、氨循环泵、液氨冷冻库和第二气氨冷凝器,所述第一气氨冷凝器和第二气氨冷凝器的液氨出口与氨循环泵液氨入口连接,所述氨循环泵液氨出口与液氨冷冻库液氨入口连接,所述液氨冷冻库气氨出口与第一气氨冷凝器和第二气氨冷凝器的气氨入口连接;
所述的乙二醇蓄冰池空调供冷循环系统包括第一乙二醇换热器、第二乙二醇换热器、第三乙二醇换热器、乙二醇循环泵和乙二醇蓄冰池,所述第一乙二醇换热器、第二乙二醇换热器和第三乙二醇换热器的乙二醇出口与乙二醇循环泵的乙二醇入口连接,所述乙二醇循环泵的乙二醇出口与乙二醇蓄冰池的乙二醇入口连接,所述乙二醇蓄冰池的乙二醇出口与第一乙二醇换热器、第二乙二醇换热器和第三乙二醇换热器的乙二醇入口连接。
本发明的有益效果是:
本发明提供了一种综合利用LNG冷能发电及供冷的系统,利用LNG气化过程中释放的冷能,采用LNG增压气化直接膨胀发电和混合工质朗肯循环发电生产高品位的电能,氨回收LNG气化过程中释放的冷能对冷库供冷,乙二醇蓄冰池回收LNG气化过程中释放的冷能对空调供冷,该系统LNG冷能梯级利用,冷能利用效率高。
下面结合附图和具体实施方式对本发明作进一步详细的说明。
附图说明
图1为本发明结构示意图;
图中:1为LNG增压泵,2为混合工质冷凝器,3为第一气氨冷凝器,4为第一乙二醇换热器,5为天然气透平膨胀机,6为第一发电机,7为混合工质增压泵,8为第二乙二醇换热器,9为混合工质空温复热器,10为混合工质透平膨胀机,11为第二发电机,12为第二气氨冷凝器,13为氨循环泵,14为液氨冷冻库,15为第三乙二醇换热器,16为乙二醇循环泵,17为乙二醇蓄冰池。
具体实施方式
实施例1:
如图1所示:一种综合利用LNG冷能发电及供冷的系统,包括LNG增压气化直接膨胀发电系统,混合工质朗肯循环发电系统,液氨冷库供冷系统,乙二醇蓄冰池空调供冷循环系统,所述LNG增压气化直接膨胀发电系统包括LNG增压泵1,混合工质冷凝器2,第一气氨冷凝器3,第一乙二醇换热器4,天然气透平膨胀机5,第一发电机6,LNG增压泵1包括LNG入口和LNG出口,LNG增压泵1LNG出口与混合工质冷凝器2LNG入口连接,混合工质冷凝器2天然气出口与第一气氨冷凝器3天然气入口连接,第一气氨冷凝器3天然气出口与第一乙二醇换热器4天然气入口连接,第一乙二醇换热器4天然气出口与天然气透平膨胀机5天然气入口连接;混合工质冷凝器2设置有混合工质入口和混合工质出口,第一气氨冷凝器3设置有气氨入口和液氨出口,第一乙二醇换热器4设置有乙二醇入口和乙二醇出口;天然气透平膨胀机5的动力输出端连接有第一发电机6,第一发电机6的电力输出端连接于电网。混合工质朗肯循环发电系统包括混合工质冷凝器2,混合工质增压泵7,第二乙二醇换热器8,混合工质空温复热器9,混合工质透平膨胀机10,第二发电机11,混合工质增压泵7包括混合工质入口和混合工质出口,混合工质出口与第二乙二醇换热器8混合工质入口连接,第二乙二醇换热器8混合工质出口与混合工质空温复热器9混合工质入口连接,混合工质空温复热器9混合工质出口与混合工质透平膨胀机10连接,混合工质透平膨胀机10混合工质出口与混合工质冷凝器2混合工质入口连接,混合工质冷凝器2混合工质出口与混合工质增压泵7混合工质入口连接;第二乙二醇换热器8设置有乙二醇入口和乙二醇出口;混合工质透平膨胀机10的动力输出端连接有第二发电机11,第二发电机11的电力输出端连接于电网。液氨冷库供冷系统包括第一气氨冷凝器3,第二气氨冷凝器12,氨循环泵13,液氨冷冻库14,第一气氨冷凝器3和第二气氨冷凝器12的液氨出口与氨循环泵13液氨入口连接,氨循环泵13液氨出口与液氨冷冻库14液氨入口连接,液氨冷冻库14气氨出口与第一气氨冷凝器3和第二气氨冷凝器12的气氨入口连接;乙二醇蓄冰池空调供冷循环系统包括第一乙二醇换热器4,第二乙二醇换热器8,第三乙二醇换热器15,乙二醇循环泵16,乙二醇蓄冰池17,第一乙二醇换热器4、第二乙二醇换热器8和第三乙二醇换热器15的乙二醇出口与乙二醇循环泵16乙二醇入口连接,乙二醇循环泵16乙二醇出口与乙二醇蓄冰池17乙二醇入口连接,乙二醇蓄冰池17乙二醇出口与第一乙二醇换热器4、第二乙二醇换热器8和第三乙二醇换热器15的乙二醇入口连接。
利用LNG气化过程中释放的冷能,采用LNG增压气化直接膨胀发电和混合工质朗肯循环发电生产高品位的电能,氨回收LNG气化过程中释放的冷能对冷库供冷,乙二醇蓄冰池回收LNG气化过程中释放的冷能对空调供冷,该系统LNG冷能梯级利用,冷能利用效率高。
以上所述,仅是本发明的较佳实施例,并非对本发明做任何形式上的限制,凡是依据本发明的技术实质上对以上实施例所作的任何简单修改、等同变化,均落入本发明的保护范围之内。
Claims (1)
1.一种综合利用LNG冷能发电及供冷的系统,包括LNG增压气化直接膨胀发电系统、混合工质朗肯循环发电系统,液氨冷库供冷系统,乙二醇蓄冰池空调供冷循环系统,其特征在于:
所述的LNG增压气化直接膨胀发电系统包括依次按梯级串接在天然气管道上的LNG增压泵、混合工质冷凝器、第一气氨冷凝器、第一乙二醇换热器和天然气透平膨胀机,所述的天然气透平膨胀机的动力输出端连接第一发电机,第一发电机的电力输出端接入电网,天然气透平膨胀机的天然气出口依次通过第二气氨冷凝器和第三乙二醇换热器的天然气管道通入界外;
所述的混合工质朗肯循环发电系统包括依次串接在混合工质管道上形成循环系统的混合工质冷凝器、混合工质增压泵、第二乙二醇换热器、混合工质空温复热器和混合工质透平膨胀机,混合工质透平膨胀机的动力输出端连接第二发电机,第二发电机的电力输出端接入电网;
所述的液氨冷库供冷系统包括第一气氨冷凝器、氨循环泵、液氨冷冻库和第二气氨冷凝器,所述第一气氨冷凝器和第二气氨冷凝器的液氨出口与氨循环泵液氨入口连接,所述氨循环泵液氨出口与液氨冷冻库液氨入口连接,所述液氨冷冻库气氨出口与第一气氨冷凝器和第二气氨冷凝器的气氨入口连接;
所述的乙二醇蓄冰池空调供冷循环系统包括第一乙二醇换热器、第二乙二醇换热器、第三乙二醇换热器、乙二醇循环泵和乙二醇蓄冰池,所述第一乙二醇换热器、第二乙二醇换热器和第三乙二醇换热器的乙二醇出口与乙二醇循环泵的乙二醇入口连接,所述乙二醇循环泵的乙二醇出口与乙二醇蓄冰池的乙二醇入口连接,所述乙二醇蓄冰池的乙二醇出口与第一乙二醇换热器、第二乙二醇换热器和第三乙二醇换热器的乙二醇入口连接。
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