CN104606910A - 一种基于蓄热技术的热泵精馏装置及其启动方法 - Google Patents
一种基于蓄热技术的热泵精馏装置及其启动方法 Download PDFInfo
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- CN104606910A CN104606910A CN201510052500.4A CN201510052500A CN104606910A CN 104606910 A CN104606910 A CN 104606910A CN 201510052500 A CN201510052500 A CN 201510052500A CN 104606910 A CN104606910 A CN 104606910A
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- 238000001704 evaporation Methods 0.000 abstract description 8
- 239000012071 phase Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products 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- 238000000926 separation method Methods 0.000 description 3
- WXZMFSXDPGVJKK-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)propane-1,3-diol Chemical compound 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OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001131 transforming Effects 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N Dimethyl carbonate Chemical compound 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CCC1=CC=CC=C1.C=CC1=CC=CC=C1 JMNDBSWHIXOJLR-UHFFFAOYSA-N 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
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Abstract
本发明公开了一种基于蓄热技术的热泵精馏装置及其启动方法,装置在原有热泵精馏流程的上,通过设置导热油锅炉、蓄热器和配套的阀门及泵等设备,在启动阶段,首先将蓄热器中的固液相变材料通过导热油熔化为液体蓄积热量,然后用导热油将精馏塔塔釜的液体预热至接近沸点温度后,以导热油为介质从已经熔化的相变材料中取热,用于蒸发精馏塔塔釜液体产生蒸汽,为热泵压缩机提供气相介质。本发明通过蓄热技术,由导热油锅炉在启动前将蓄热器中的固液相变材料熔化,满足启动阶段塔釜所需的大量热量,从而可实现热泵精馏装置的快速启动,同时设置的导热油锅炉负荷小,在正常精馏模式时,仅用于补充热泵不足的热量。
Description
技术领域
[0001] 本发明属于化工分离和节能改造技术领域,涉及一种精馏方法和装置,具体涉及 一种基于蓄热技术的热泵精馏装置及其启动方法。
背景技术
[0002] 过程工业就是以流程性物料为主要处理对象、完成各种生产过程的工业,例如石 油化工、生物化工、制药、农药、食品和炼油等等。过程工业其产值虽然占我国工业总产值 的37%,占制造业的46. 9%,但是其耗能也占总的终端能源消费量约57. 4%。通常过程工 业不论规模如何,皆可分解为一系列名为单元操作的过程,而这些单元操作中大多伴随着 能量的转换,特别是分离过程,例如精馏和干燥均需要消耗大量的能源,以常见的化工生产 为例,分离过程能耗占生产总能耗的40%,而其中95%又为蒸馏和干燥或蒸发浓缩过程所消 耗。
[0003] 在常规精馏塔的流程中,塔底再沸器所输入的能量大约有95%在塔顶被冷却空气 或冷却水带走。一般情况下,这部分能量不能得到进一步的回收利用,热力学效率很低。与 精馏过程类似,干燥或蒸发浓缩是一种热分离技术,在化工,医药,食品,果饮,天然有机产 品等领域有着广泛且重要的应用。蒸发浓缩需要消耗大量的热量,是一种能量密集型单元 过程。单位生蒸汽可以蒸发的料液量是衡量蒸发浓缩过程热利用率的重要参数。无任何节 能技术的单效蒸发浓缩过程,1. 1单位的生蒸汽仅能蒸发约1单位的料液,在这个过程中, 一方面,没有过程的热集成设计,二次蒸汽的能量被浪费;另一方面,生蒸汽做为高品质能 量被直接转化为高温凝结水,品质损失较大。
[0004] 多年来,人们已采用了多种方法和手段对精馏和干燥的装置和操作进行改进,以 减少其所消耗的能量,例如在精馏塔中以产品物流预热进料、增加塔板数、减小回流比、增 设中间再沸器和中间冷凝器、多塔差压精馏、适宜的保温材料和高效填料等方式;在干燥和 蒸发浓缩过程中采用多效蒸发技术以降低生蒸汽的耗量。这些方法虽然都取得了较好的效 果,但要进一步降低能耗,只有通过热量回收技术来实现,因此将热泵技术引入分离生产过 程便是目前最为突出的、行之有效的节能方法之一。
[0005] 文献《热泵精馏的应用形式研宄进展》(郑聪,宋爽,穆钰君等,现代化工,2008. 6)、 《化工节能中的热泵精馏工艺流程分析》(许维秀,朱圣东,李其京,节能,2004. 10)对不同类 型的热泵精馏方法、在国内外的应用情况以及存在的问题进行了较详细的归纳,例如从上 世纪80年代末开始,国外企业例如Sulzer公司在乙苯-苯乙烯等装置上广泛采用热泵技 术,国内锦州炼油厂的热泵精馏塔系统也得到了很好的效果。
[0006] 中国专利200610033935. 5《醋酸丁酯的热泵精馏生产方法及装置》和中国专利 02145503. 1《燃料乙醇热泵恒沸精馏工艺及装置》采用开式热泵技术和精馏塔耦合在一起, 分别应用于醋酸丁酯和燃料乙醇的生产中,可取得良好的节能效果。但是,与常规的精馏装 置不同,热泵精馏过程中是采用塔顶的蒸汽升压后来加热塔釜的物料,在系统还没有启动 时,塔顶并不存在蒸汽,因此也无法加热塔釜,因此如何启动热泵精馏是该技术实际应用中 面临的一个重要问题。通常的做法是在塔釜设置小功率的电加热器或使压缩机从十分小的 流量逐渐向额定流量切换,这些方法都存在启动时间长,启动过程不稳定等缺点。
[0007] 中国专利200910022126. 8《热泵精馏节能改造方法和装置》中针对化工行业存在 大量的有节能改造潜力的精馏塔,提出了一种侧线改造的装置,同时对于启动和弹性调节 设计了一套方法,可实现快速启动。但是,该方法在启动阶段,需要采用与原有工艺相同流 量的蒸汽,因此需要保留原有蒸汽锅炉,其对于老系统的改造时,容易实现,但是如果对于 新系统的设计则会增加投资。此外,为了实现负荷的调节,该专利设计的流程中也需要保持 锅炉小负荷运行,这对锅炉工作十分不利。
发明内容
[0008] 本发明的目的在于克服现有技术存在的以上问题,提供一种基于蓄热技术的热泵 精馏装置及其启动方法。
[0009] 为实现上述目的,达到上述技术效果,本发明通过以下技术方案实现: 一种基于蓄热技术的热泵精馏装置,包括精馏塔,所述精馏塔的塔顶蒸汽出口通过管 道分别与第七截止阀及第八截止阀入口相连,所述第八截止阀出口通过管道与冷凝器壳程 入口相连,所述冷凝器管程进出口通过管道连接冷却水,并在冷却水入口管路上安装流量 调节阀,所述第七截止阀出口通过管道与压缩机入口相连,所述压缩机出口通过管道与第 十二截止阀入口相连,所述第十二截止阀出口通过管道与主再沸器壳程入口相连,所述主 再沸器壳程出口通过管道与后冷器管程入口相连,所述后冷器壳程进出口通过管道连接冷 却水,所述后冷器管程出口通过管道与液体缓冲罐的入口相连,所述液体缓冲罐出口通过 管道与屏蔽泵入口相连,屏所述蔽泵出口通过管道物料储液罐的入口相连,物料储液罐的 另一入口通过管道与所述冷凝器的壳程出口相连,所述精馏塔上部物料回流口与物料储液 罐出口通过管道相连,所述物料储液罐另一出口通过管道与下一设备连接,所述精馏塔塔 底出口通过管道与辅再沸器下部管程入口及第十一截止阀入口相连,所述辅再沸器上部管 程出口与所述精馏塔下部上升蒸汽进口及第十截止阀出口相连,所述主再沸器上部管程出 口通过管道与所述第十截止阀入口连接,所述主再沸器下部管程入口通过管道与第十一截 止阀出口连接;导热油锅炉出口至所述主再沸器壳程入口之间通过管道顺次连接有第一导 热油泵和第四截止阀,所述导热油锅炉入口至所述主再沸器壳程出口之间通过管道连接有 第三截止阀,蓄热器储热入口与所述第一导热油泵出口间通过管道连接有第二截止阀,所 述蓄热器储热出口与导热油锅炉入口之间通过管道连接有第一截止阀,所述蓄热器取热出 口至第四截止阀出口间通过管道顺次连接有第六截止阀和第二导热油泵,所述蓄热器取热 入口至第三截止阀入口间通过管道连接有第五截止阀。
[0010] 优选的,所述蓄热器采用板式蓄热换热器,其由多组蓄热单元组成,每组蓄热单元 由第一隔板、第二隔板、第三隔板和第四隔板构成,所述第一隔板和所述第二隔板形成热侧 通道,所述第三隔板和所述第四隔板形成冷侧通道,所述第二隔板和所述第三隔板形成蓄 热通道,所有蓄热单元的热侧通道与所述蓄热器储热入口和出口连接,所有蓄热单元的冷 侧通道与所述蓄热器取热入口和出口连接。
[0011] 进一步的,所述蓄热通道中填充有固液相变蓄热材料。
[0012] 进一步的,所述压缩机为热泵蒸汽压缩机。
[0013] 进一步的,所述压缩机的结构形式为螺杆压缩机、活塞压缩机、离心式压缩机或罗 茨风机。
[0014] 进一步的,所述压缩机由变频电机驱动。
[0015] 优选的,所述装置的工作模式有四种: 1) 当所述第一截止阀、所述第二截止阀、所述第五截止阀和所述第六截止阀关闭,所述 第三截止阀和所述第四截止阀打开,所述压缩机和所述第一导热油泵开启,所述第二导热 油泵停止,所述装置工作在正常热泵精馏模式; 2) 当所述第一截止阀、所述第二截止阀、所述第五截止阀和所述第六截止阀,所述第三 截止阀和所述第四截止阀打开,所述第一导热油泵开启,所述第二导热油泵和所述压缩机 停止,所述装置工作在启动预热模式; 3) 当所述第一截止阀、所述第二截止阀关闭,第三截止阀、第四截止阀、第五截止阀、第 六截止阀打开,所述第一导热油泵和所述第二导热油泵开启,所述压缩机停止,所述装置工 作在正常启动模式; 4) 当所述第三截止阀、所述第四截止阀、所述第五截止阀、所述第六截止阀关闭,所述 第一导热油泵开启,所述压缩机停止,所述装置工作在蓄热模式。
[0016] -种基于蓄热技术的热泵精馏启动方法,所述方法包括如下步骤: 1) 使装置工作在蓄热模式,关闭第七截止阀、第八截止阀、第十截止阀、第十一截止阀、 第十二截止阀和第十三截止阀和流量调节阀,让导热油锅炉产生的高温导热油流经蓄热器 中热侧通道,降温后的导热油再次返回所述导热油锅炉加热,使蓄热器10蓄热通道1007中 的固液相变材料完全融化成液体; 2) 使装置工作在启动预热模式,关闭第七截止阀、第十截止阀、第十一截止阀、第十二 截止阀和第十三截止阀,打开流量调节阀和第八截止阀,使导热油锅炉中高温导热油流经 辅再沸器壳程,在热虹吸作用下,精馏塔1塔釜中的液体被全部预热至设定温度; 3) 使装置工作在正常启动模式,打开第七截止阀、第十截止阀、第十一截止阀、第十二 截止阀和流量调节阀,关闭第十三截止阀,由辅再沸器壳程出口流出的导热油一部分返回 导热油锅炉,另外一部分通过蓄热器冷侧通道,蓄热器蓄热通道中的固液相变材料逐渐转 化为固体,释放热量加热流经冷侧通道中的导热油,从蓄热器取热出口流出并升温的导热 油与来自导热油锅炉的高温导热油混合后,再次流经辅再沸器壳程,对辅再沸器管程的液 体加热,产生蒸汽,蒸汽在精馏塔1中上升至塔顶,在冷凝器中冷凝成液体,流经物料储液 罐7后全部从精馏塔1上部物料回流口返回精馏塔1中,直至精馏塔1塔顶物料组成、压力 和温度满足要求; 4) 使装置工作在正常热泵精馏模式,关闭第八截止阀和流量调节阀,开启屏蔽泵,完成 启动。
[0017] 本发明的有益效果是: 本发明通过蓄热技术,由导热油锅炉在启动前将蓄热器中的固液相变材料熔化,满足 启动阶段塔釜所需的大量热量,从而可实现热泵精馏装置的快速启动,同时设置的导热油 锅炉负荷小,在正常精馏模式时,仅用于补充热泵不足的热量。
[0018] 上述说明仅是本发明技术方案的概述,为了能够更清楚了解本发明的技术手段, 并可依照说明书的内容予以实施,以下以本发明的较佳实施例并配合附图详细说明如后。 本发明的具体实施方式由以下实施例及其附图详细给出。
附图说明
[0019] 此处所说明的附图用来提供对本发明的进一步理解,构成本申请的一部分,本发 明的示意性实施例及其说明用于解释本发明,并不构成对本发明的不当限定。在附图中: 图1为本发明的基于蓄热技术的热泵精馏装置流程示意图; 图2为本发明的蓄热器内部蓄热单元示意图。
[0020] 图中标号说明: 1、精馏塔,2、主再沸器,3、辅再沸器,4、后冷器,5、液体缓冲罐,6、压缩机,7、物料储 液罐,8、冷凝器,9、导热油锅炉,10、蓄热器,101、第一截止阀,102、第二截止阀,103、第三截 止阀,104、第四截止阀,105、第五截止阀,106、第六截止阀,107、第七截止阀,108、第八截止 阀,109、流量调节阀,110、第十截止阀,111、第^^一截止阀,112、第十二截止阀,113、第十三 截止阀,201、第一导热油泵,202、第二导热油泵,203为屏蔽泵,1000为蓄热单元,1001、 第一隔板,1002、第二隔板,1003、第三,1004、第四隔板,1005、热侧通道,1006、冷侧通道, 1007、蓄热通道。
具体实施方式
[0021] 下面将参考附图并结合实施例,来详述本发明的结构特点及技术实施过程: 一种基于蓄热技术的热泵精馏装置,包括精馏塔1,所述精馏塔1的塔顶蒸汽出口通过 管道分别与第七截止阀107及第八截止阀108入口相连,所述第八截止阀108出口通过管 道与冷凝器8壳程入口相连,所述冷凝器8管程进出口通过管道连接冷却水,并在冷却水入 口管路上安装流量调节阀109,所述第七截止阀107出口通过管道与压缩机6入口相连,所 述压缩机6出口通过管道与第十二截止阀112入口相连,所述第十二截止阀112出口通过 管道与主再沸器3壳程入口相连,所述主再沸器3壳程出口通过管道与后冷器4管程入口 相连,所述后冷器4壳程进出口通过管道连接冷却水,所述后冷器4管程出口通过管道与液 体缓冲罐5的入口相连,所述液体缓冲罐5出口通过管道与屏蔽泵203入口相连,屏所述蔽 泵203出口通过管道物料储液罐7的入口相连,物料储液罐7的另一入口通过管道与所述 冷凝器8的壳程出口相连,所述精馏塔1上部物料回流口与物料储液罐7出口通过管道相 连,所述物料储液罐7另一出口通过管道与下一设备连接,所述精馏塔1塔底出口通过管道 与辅再沸器2下部管程入口及第十一截止阀111入口相连,所述辅再沸器2上部管程出口 与所述精馏塔1下部上升蒸汽进口及第十截止阀110出口相连,所述主再沸器3上部管程 出口通过管道与所述第十截止阀110入口连接,所述主再沸器3下部管程入口通过管道与 第十一截止阀111出口连接;导热油锅炉9出口至所述主再沸器2壳程入口之间通过管道 顺次连接有第一导热油泵201和第四截止阀104,所述导热油锅炉9入口至所述主再沸器 2壳程出口之间通过管道连接有第三截止阀103,蓄热器10储热入口与所述第一导热油泵 201出口间通过管道连接有第二截止阀102,所述蓄热器10储热出口与导热油锅炉入口之 间通过管道连接有第一截止阀101,所述蓄热器10取热出口至第四截止阀104出口间通过 管道顺次连接有第六截止阀106和第二导热油泵202,所述蓄热器10取热入口至第三截止 阀103入口间通过管道连接有第五截止阀105。
[0022] 进一步的,所述蓄热器10采用板式蓄热换热器,其由多组蓄热单元1000组成,每 组蓄热单元1000由第一隔板1001、第二隔板1002、第三隔板1003和第四隔板1004构成, 所述第一隔板1001和所述第二隔板1002形成热侧通道1005,所述第三隔板1003和所述 第四隔板1004形成冷侧通道1006,所述第二隔板1002和所述第三隔板1003形成蓄热通 道1007,所有蓄热单元1000的热侧通道1005与所述蓄热器10储热入口和出口连接,所有 蓄热单元1000的冷侧通道1006与所述蓄热器10取热入口和出口连接,所述蓄热通道1007 中填充有固液相变蓄热材料。
[0023] 本实施例应用于年产1万吨碳酸二甲酯反应精馏塔热泵精馏工艺中,热泵提供的 热量为2900kW,塔釜所需总热量为3200kW,物料组成和操作参数如表1所示。
[0024] 表1反应精馏塔物料组成和操作参数
选择导热油锅炉9的加热能力为400kW,所选导热油密度870kg/m3,比热2. 6kJ/kg. K, 导热油入口温度为120°C,出口温度为160°C,蓄热器10中固液相变材料采用季戊四醇 (PE),其相变温度为188°C,相变焓为323kJ/kg,正常启动模式所需时间为1小时,蓄热器10 蓄热能力为3000kWh,计算可知所需固液相变材料为34吨,体积为24立方米。
[0025] 本实施例的工作过程如下: 1) 开启导热油锅炉,使装置工作在蓄热模式,关闭第七截止阀107、第八截止阀108、第 十截止阀110、第^^一截止阀111、第十二截止阀112、第十三截止阀113,和流量调节阀109, 让导热油锅炉9产生的高温导热油流经蓄热器10中热侧通道1005,降温后的导热油再次返 回导热油锅炉9加热,导热油循环流量为13. 8T/h,循环约7. 5小时候,蓄热器10蓄热通道 1007中的固液相变材料完全融化成液体; 2) 使装置工作在启动预热模式,关闭第七截止阀107、第十截止阀110、第十一截止阀 111、第十二截止阀112和第十三截止阀113,打开流量调节阀109和第八截止阀108,使导 热油锅炉9中高温导热油流经辅再沸器2壳程,在热虹吸作用下,精馏塔1塔釜中的液体被 全部预热,直至塔釜液面底部温度达到65°C ; 3) 打开第七截止阀107、第八截止阀108、第十截止阀110、第^^一截止阀111、第十二截 止阀112和流量调节阀109,关闭第十三截止阀113,使装置工作在正常启动模式,由辅再沸 器2壳程出口流出的导热油一部分返回导热油锅炉9,另外一部分通过蓄热器10冷侧通道 1006,蓄热器10蓄热通道1007中的固液相变材料逐渐转化为固体,释放热量加热流经冷侧 通道1006中的导热油,从蓄热器10取热出口流出并升温的导热油与来自导热油锅炉9的 高温导热油混合后,再次流经辅再沸器2壳程,对辅再沸器2管程的液体加热,产生蒸汽,蒸 汽在精馏塔1中上升至塔顶,在冷凝器8中冷凝成液体,流经物料储液罐7后全部从精馏塔 1上部物料回流口返回精馏塔1中; 4)当精馏塔1塔顶物料组成、压力和温度满足表1要求后,使装置工作在正常热泵精馏 模式,关闭第八截止阀108和流量调节阀109,开启屏蔽泵203,完成启动过程。
[0026] 热泵精馏装置启动过程中,若不考虑蓄热器10需要花费7. 5小时进行蓄热模式 夕卜,系统启动所需的3200kW热量绝大部分来自于从蓄热材料的取热,实际热泵精馏启动时 间很短。
[0027] 以上所述仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技 术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修 改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (8)
1. 一种基于蓄热技术的热泵精馏装置,其特征在于,包括精馏塔(1),所述精馏塔(I) 的塔顶蒸汽出口通过管道分别与第七截止阀(107)及第八截止阀(108)入口相连,所述第 八截止阀(108 )出口通过管道与冷凝器(8 )壳程入口相连,所述冷凝器(8 )管程进出口通过 管道连接冷却水,并在冷却水入口管路上安装流量调节阀(109),所述第七截止阀(107)出 口通过管道与压缩机(6)入口相连,所述压缩机(6)出口通过管道与第十二截止阀(112)入 口相连,所述第十二截止阀(112)出口通过管道与主再沸器(3)壳程入口相连,所述主再沸 器(3 )壳程出口通过管道与后冷器(4 )管程入口相连,所述后冷器(4 )壳程进出口通过管道 连接冷却水,所述后冷器(4)管程出口通过管道与液体缓冲罐(5)的入口相连,所述液体缓 冲罐(5)出口通过管道与屏蔽泵(203)入口相连,屏所述蔽泵(203)出口通过管道物料储液 罐(7)的入口相连,物料储液罐(7)的另一入口通过管道与所述冷凝器(8)的壳程出口相 连,所述精馏塔(1)上部物料回流口与物料储液罐(7)出口通过管道相连,所述物料储液罐 (7 )另一出口通过管道与下一设备连接,所述精馏塔(1)塔底出口通过管道与辅再沸器(2 ) 下部管程入口及第十一截止阀(111)入口相连,所述辅再沸器(2)上部管程出口与所述精 馏塔(1)下部上升蒸汽进口及第十截止阀(110)出口相连,所述主再沸器(3)上部管程出口 通过管道与所述第十截止阀(110)入口连接,所述主再沸器(3)下部管程入口通过管道与 第十一截止阀(111)出口连接;导热油锅炉(9)出口至所述主再沸器(2)壳程入口之间通过 管道顺次连接有第一导热油泵(201)和第四截止阀(104),所述导热油锅炉(9)入口至所述 主再沸器(2)壳程出口之间通过管道连接有第三截止阀(103),蓄热器(10)储热入口与所 述第一导热油泵(201)出口间通过管道连接有第二截止阀(102),所述蓄热器(10)储热出 口与导热油锅炉入口之间通过管道连接有第一截止阀(101),所述蓄热器(10)取热出口至 第四截止阀(104)出口间通过管道顺次连接有第六截止阀(106)和第二导热油泵(202),所 述蓄热器(10)取热入口至第三截止阀(103)入口间通过管道连接有第五截止阀(105)。
2. 根据权利要求1所述的基于蓄热技术的热泵精馏装置,其特征在于,所述蓄热器 (10)采用板式蓄热换热器,其由多组蓄热单元组成,每组蓄热单元由第一隔板(1001)、第二 隔板(1002)、第三隔板(1003)和第四隔板(1004)构成,所述第一隔板(1001)和所述第二 隔板(1002)形成热侧通道(1005),所述第三隔板(1003)和所述第四隔板(1004)形成冷侧 通道(1006),所述第二隔板(1002)和所述第三隔板(1003)形成蓄热通道(1007),所有蓄 热单元(1000)的热侧通道(1005)与所述蓄热器(10)储热入口和出口连接,所有蓄热单元 (1000)的冷侧通道(1006)与所述蓄热器(10)取热入口和出口连接。
3. 根据权利要求1所述的基于蓄热技术的热泵精馏装置,其特征在于,所述蓄热通道 (1007)中填充有固液相变蓄热材料。
4. 根据权利要求1所述的基于蓄热技术的热泵精馏装置,其特征在于,所述压缩机 (5)为热泵蒸汽压缩机。
5. 根据权利要求1所述的基于蓄热技术的热泵精馏装置,其特征在于,所述压缩机(5) 的结构形式为螺杆压缩机、活塞压缩机、离心式压缩机或罗茨风机。
6. 根据权利要求1所述的基于蓄热技术的热泵精馏装置,其特征在于,所述压缩机(5) 由变频电机驱动。
7. 根据权利要求1所述的基于蓄热技术的热泵精馏装置,其特征在于,所述装置的工 作模式有四种: 1) 当所述第一截止阀(101)、所述第二截止阀(102)、所述第五截止阀(105)和所述第 六截止阀(106)关闭,所述第三截止阀(103)和所述第四截止阀(104)打开,所述压缩机(6) 和所述第一导热油泵(201)开启,所述第二导热油泵(202)停止,所述装置工作在正常热泵 精馏模式; 2) 当当所述第一截止阀(101)、所述第二截止阀(102)、所述第五截止阀(105)和所述 第六截止阀(106),所述第三截止阀(103)和所述第四截止阀(104)打开,所述第一导热油 泵(201)开启,所述第二导热油泵(202)和所述压缩机(6)停止,所述装置工作在启动预热 模式; 3) 当所述第一截止阀(101)、所述第二截止阀(102)关闭,第三截止阀(103)、第四截止 阀(104)、第五截止阀(105)、第六截止阀(106)打开,所述第一导热油泵(201)和所述第二 导热油泵(202 )开启,所述压缩机(6 )停止,所述装置工作在正常启动模式; 4) 当所述第三截止阀(103)、所述第四截止阀(104)、所述第五截止阀(105)、所述第六 截止阀(106)关闭,所述第一导热油泵(201)开启,所述压缩机(4)停止,所述装置工作在蓄 热模式。
8. -种基于蓄热技术的热泵精馏启动方法,其特征在于,所述方法包括如下步骤: 1) 使装置工作在蓄热模式,关闭第七截止阀(107)、第八截止阀(108)、第十截止阀 (110)、第^^一截止阀(111)、第十二截止阀(112)和第十三截止阀(113)和流量调节阀 (109),让导热油锅炉(9)产生的高温导热油流经蓄热器(10)中热侧通道(1005),降温后的 导热油再次返回所述导热油锅炉(9)加热,使蓄热器(10)蓄热通道(1007)中的固液相变材 料完全融化成液体; 2) 使装置工作在启动预热模式,关闭第七截止阀(107)、第十截止阀(110)、第十一截 止阀(111 )、第十二截止阀(112 )和第十三截止阀(113 ),打开流量调节阀(109 )和第八截止 阀(108),使导热油锅炉(9)中高温导热油流经辅再沸器(2)壳程,在热虹吸作用下,精馏塔 (1)塔釜中的液体被全部预热至设定温度; 3) 使装置工作在正常启动模式,打开第七截止阀(107)、第十截止阀(110)、第^^一截 止阀(111 )、第十二截止阀(112)和流量调节阀(109),关闭第十三截止阀(113),由辅再沸 器(2)壳程出口流出的导热油一部分返回导热油锅炉(9),另外一部分通过蓄热器(10)冷 侧通道(1006),蓄热器(10)蓄热通道(1007)中的固液相变材料逐渐转化为固体,释放热量 加热流经冷侧通道(1006)中的导热油,从蓄热器(10)取热出口流出并升温的导热油与来 自导热油锅炉(9)的高温导热油混合后,再次流经辅再沸器(2)壳程,对辅再沸器(2)管程 的液体加热,产生蒸汽,蒸汽在精馏塔(1)中上升至塔顶,在冷凝器(8)中冷凝成液体,流经 物料储液罐(7 )后全部从精馏塔(1)上部物料回流口返回精馏塔(1)中,直至精馏塔(1)塔 顶物料组成、压力和温度满足要求; 4) 使装置工作在正常热泵精馏模式,关闭第八截止阀(108)和流量调节阀(109),开启 屏蔽栗(203),完成启动。
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