CN1351246A - 减蚀剂补充系统 - Google Patents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
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- F25B47/003—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing corrosion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
一种在线减蚀剂补充系统,它可用在一种吸收式冷却单元中,该单元包括一蒸发器装置、一吸收器装置、一发生器装置和一冷凝器装置,它们相互联系以提供一种吸收式循环,溴化锂溶液可通过一系列相互联系的流线和泵通过所述单元进行循环。一种定时放出减蚀剂的供源与所述流线之一相连,以便选择性地将减蚀物质释放入所述溶液。
Description
技术领域
本发明总地涉及吸收式制冷系统,更具体地说是涉及这些系统中使用的减蚀物质以及将这些物质提供给吸收式系统的方法。通常提供给吸收式系统的减蚀剂可使系统中接触系统工作液的金属的腐蚀减少。
背景技术
吸收式制冷系统中使用着许多对不同的制冷剂和吸收剂。其中之一是水和锂的卤盐(例如溴化锂、氯化锂或碘化锂),将它们混合起来以形成锂盐的浓缩水溶液。另一对是水和氨。
吸收式制冷系统中使用的结构材料一般是铁和铁合金(如钢)以及铜和铜合金。这些材料的腐蚀将造成不利的影响,如果不加以抑制,有时会缩短冷却器内部构件的使用寿命。不但金属损失,而且黑色金属的氧化还会产生气态氢。如果不加以清除,氢会妨碍系统的正常运行。在使用锂的卤盐的系统中,腐蚀问题特别重要,而且与特定系统中使用的制冷剂/吸收剂对无关,金属腐蚀的速度将随系统温度的上升而增加。
众所周知的现有技术是将铬盐(例如铬酸锂)添加入吸收式制冷系统中的制冷剂/吸收剂溶液,它可有效地减少金属的腐蚀。铬酸盐化合物的存在可促使铁和铬氧化物的保护层形成在与吸收剂接触的系统表面上。随着铁的氧化减少,生成的非凝聚态氢也相应减少。然而,令人担忧的是铬的存在会损害健康。至少有一家政府机构(美国环保署)已经将铬认定为致癌物质,并已禁止在向大气开放的系统中存在铬化合物。在书写本文之时,对于在封闭系统中使用铬化合物尚无任何限制,但在近期可能会进行限制。当然,吸收式制冷系统是封闭系统,但是通过样本提取、制造过程以及搬运和加注过程中的溢出,会使一定数量的工作液处于大气之中。在系统使用寿命的末期,对系统进行处理必须排除工作液,包括其中含有的铬化合物。
目前在吸收式制冷系统中可作为工作液使用的是锂的卤盐或氨的无铬水溶液。除锂盐或氨之外,溶液一般也可包括含有钼酸盐的化合物、含有硼酸盐的化合物以及在较佳的实施例中,含有硅酸盐的化合物,以使工作液中出现钼、硼和硅的离子。将足量的、含有氢氧化物的化合物加入溶液,使其呈强碱性。加入的成分可作为高效减蚀剂。这些流体的减蚀性能优于现有的铬酸锂减蚀剂的减蚀性能。
将钼、硼和在较佳的实施例中的硅的卤盐或铵盐加入锂盐或氨的水溶液中,可制备出一种工作液。也可加入氢氧化钠、氢氧化锂、氢氧化钾或氢氧化铵以获得所需的碱度。较佳的是,化合物以水溶液的方式加入。这种系统在美国专利5,547,600中有较详细的叙述,本文将援引其内容作为参考。
经验表明,新的吸收式冷却器在其运行的早期阶段消耗减蚀剂的速度较快。冷却器在低于建议的减蚀剂浓度水平下运行,会使其内部所遭受的腐蚀速度令人无法接受,并有可能使循环提前失效。为了向冷却器提供理想的腐蚀防护,这种初始减蚀剂的快速消耗要求通过溶液采样来对减蚀剂浓度进行密切观察,并由一位熟练的机器操作员或维护技师来及时补充减蚀剂,以维持所需的腐蚀防护。这种需要人员的注意力的方法既昂贵又易于导致问题的发生,如由于采样失误和未及时地将减蚀剂加入系统都将产生破坏性的腐蚀速度。
发明内容
因此,本发明的目的是提供一种用于吸收式制冷系统的减蚀剂补充系统,它可以克服上述现有技术中的问题。
本发明提供一种系统,它在冷却器运行了选定的若干小时后可以定期性地自动补充减蚀剂。使用外壳包裹减蚀剂可以实现该功能,可呈丸粒、颗粒、小片、胶囊或块状。当减蚀剂的外壳处于吸收式冷却器的制冷剂(水)中时,经过一段特定时间后就会破裂,于是将减蚀剂释放到制冷剂中。该过程类似于间隔一段预定时间释放某些药物、肥料和用于洗碗机的防污斑剂的定时释放过程。当冷却器运行时,减蚀剂将只会处于制冷剂中某一选定的位置。这使胶囊型的减蚀剂处于制冷剂中的时间将与冷却器的运行时间相联系。或者,将减蚀剂引入制冷剂的喷淋头会促进制冷剂的混合,该制冷剂通过喷嘴和制冷剂泵进行循环。为冷却器的电子控制所编制的程序可以在运行期的规定时间中触发一次稀释循环事件,以使富含减蚀剂的制冷剂与溴化锂溶液在吸收器中充分混合,由溶液泵将它们循环至冷却器的其余部分。这一在定时的基础上的自动的减蚀剂补充循环过程的完成可以维护整个冷却器内部的腐蚀防护表面的完整性。
附图说明
为了充分理解本发明的性质和目的,可参考下面的本发明的较佳实施例的详细叙述并可结合附图进行理解,其中:
图1图示了一吸收式系统的关键构件;
图2是一可容纳减蚀物质的容器的放大侧视图;
图3是沿图2中的线3-3截取的容器示意图。
具体实施方式
现在请看图1,在图1所示的机器中图示了吸收式系统10的基本构件。根据冷却模式下的机器运行来叙述循环的运行过程,然而,本技术领域中的熟练人员应当清楚,可调整该循环以使机器也能在供热模式下运行。本系统将水作为制冷剂,将溴化锂(它与水有较高的亲和力)作为吸收剂。
该机器包括一蒸发器19和一吸收器20,它们被并排地安装在一个公共的外壳21中。过程中使用的液态制冷剂在蒸发器中得以汽化,蒸发器从待冷却的物质中吸收热量。管线23将待冷却的物质带过蒸发器。在蒸发器中产生的被汽化的制冷剂输送至吸收器与吸收剂结合,以产生一种适合在过程中使用的溶液。由水管线24将吸收过程中的热量带出吸收器。
一旦稀溶液离开低温溶液的热交换器27,可借助低温溶液管线31将其一部分送至低温发生器36。借助溶液管线29将剩余的稀溶液沿高温溶液的热交换器28送至高温发生器16。尽管在图1中没有示出,但是外部热源使高温发生器中的稀溶液的温度升高以使制冷剂汽化,并因而使其离开溶液。已蒸发的制冷剂蒸汽通过蒸汽管线35进入低温发生器36,所述低温发生器与系统冷凝器38同处于外壳37中。在这里,剩余的稀溶液将被加热,高温制冷剂使稀溶液中含有的制冷剂汽化,它与高温发生器的蒸汽一起被送入系统冷凝器中冷凝。在冷凝器中,制冷剂的蒸汽与通过管线24的冷却水进行热交换,可使制冷剂处于过冷液体的状态中。吸收剂浓溶液从两只发生器中流回至吸收器,以便在吸收式循环中得以再利用。在其回流时,从高温发生器中流出的浓溶液经过高温溶液的热交换器28,然后借助溶液回流管线40流过第二低温溶液的热交换器27。从低温发生器中流出的浓溶液通过补给管线42进入溶液回流管线,所述补给管线在第二溶液的热交换器的进口处进入回流管线。
冷凝器中凝结为液体的制冷剂在重力作用下经由管线41流入蒸发器的贮液槽。
吸气管线46将一制冷剂泵43与系统的蒸发器的贮液槽44相连接,设置该制冷剂泵使其可借助供给管线47将汇集在贮液槽中的液态制冷剂抽回至喷淋头39。
根据本发明,一容器50位于喷淋头39上游的制冷剂回流供给管线47中,其作用是向系统补充减蚀剂。该容器包括一外壳52和一包含胶囊型减蚀剂的内部网篮(mesh basket)54,内部网篮允许制冷剂流过容器,并可使减蚀剂溶解及混合在制冷剂中,并通过喷淋头39释放出来。如图2所示,减蚀剂呈颗粒56的形状。在另一种实施例中,容器可在图1所示的60处与流线29相连,其作用与上述的容器50相同。在本发明中,钼酸盐形式的钼(例如钼酸锂)可用作为较佳的减蚀剂。
用于吸收式装置的工作液应当具有从0.03至0.2的当量浓度,钼的浓度范围是120至180ppm,硼的浓度范围是160至220ppm,以及硅的浓度范围是1至20ppm。此外,浓度相对较小(钼的浓度约为10ppm,硼的浓度约为1ppm)的减蚀添加剂即可有效地减少腐蚀。这些添加剂在先前认定的美国专利5,547,600中有详细叙述。定时释放是借助在本技术领域中众所周知的传统技术来实现的。固体减蚀剂——即呈颗粒或丸状的钼酸锂覆盖有一层可渗透的或固体的外壳,可将钼酸锂缓慢而均匀地释放至溶液中。适当的外壳物质包括硅胶、硅酸盐、明胶和其它相关的凝胶。
Claims (11)
1.一种在线减蚀剂补充系统,它可用在一种吸收式冷却单元中,该单元包括一蒸发器装置、一吸收器装置、一发生器装置和一冷凝器装置,一系列相互联系的流线和泵将它们连接在一起,所述系统可提供一种吸收式循环,溴化锂溶液可通过所述单元进行循环,其特征在于,设置一定时释放减蚀物质的供源,使其与所述流线之一相连,以便当所述单元运行时选择性地将减蚀物质释放入所述溶液,使减蚀剂得以改进。
2.如权利要求1所述的系统,其特征在于,所述定时放出减蚀剂的装置与制冷剂供给管线相连接。
3.如权利要求2所述的系统,其特征在于,所述减蚀剂流过蒸发器的喷淋头。
4.如权利要求1所述的系统,其特征在于,减蚀剂是钼酸盐。
5.如权利要求4所述的系统,其特征在于,钼酸盐是钼酸锂。
6.如权利要求5所述的系统,其特征在于,被释放的钼酸锂以约为120至180ppm的浓度存在于溴化锂溶液中。
7.一种在线减蚀剂补充系统,它可用在一种吸收式冷却单元中,该单元包括一蒸发器装置、一吸收器装置、一发生器装置和一冷凝器装置,它们相互联系以提供一种吸收式循环,溴化锂溶液可通过一系列相互联系的流线和泵通过所述单元进行循环,所述系统还包括一减蚀剂的供源,该来源与所述流线之一相连,以便当所述单元运行时,选择性地将减蚀物质释放入所述溶液。
8.如权利要求4所述的系统,其特征在于,减蚀剂的供源呈容器状,所述容器与制冷剂供给管线在线相连,它通过蒸发器的喷淋头在系统中释放减蚀剂。
9.如权利要求7所述的系统,其特征在于,减蚀剂是钼酸盐。
10.如权利要求7所述的系统,其特征在于,钼酸盐是钼酸锂。
11.如权利要求7所述的系统,其特征在于,被释放的钼酸锂以约为120至180ppm的浓度存在于溴化锂溶液中。
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US09/703,116 | 2000-10-31 | ||
US09/703,116 US6430942B1 (en) | 2000-10-31 | 2000-10-31 | Inhibitor replenishment system |
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US6637220B1 (en) * | 2002-07-29 | 2003-10-28 | Carrier Corporation | Dilution cycle for absorption chiller |
US6823682B1 (en) * | 2004-01-13 | 2004-11-30 | Carrier Corporation | Absorptive chiller with evaporator protection |
JP4913474B2 (ja) * | 2006-05-08 | 2012-04-11 | 日立協和エンジニアリング株式会社 | 吸収式冷温水機 |
DE102008037597B4 (de) * | 2008-11-27 | 2014-10-30 | Webasto Ag | Opferanode für eine mobile Absorptionskälteanlage |
KR20220120596A (ko) | 2019-12-09 | 2022-08-30 | 디에고 제이콥슨 | 혹한기 생존 수트 |
CN111811160A (zh) * | 2020-07-01 | 2020-10-23 | 同方节能装备有限公司 | 一种溴化锂机组水系统的防腐结构 |
US11970254B1 (en) | 2020-12-10 | 2024-04-30 | Diego Jacobson | Cold weather infant survival suit |
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US5186009A (en) * | 1987-04-14 | 1993-02-16 | Gas Research Institute | Aqueous absorption fluids |
GB9123794D0 (en) * | 1991-11-08 | 1992-01-02 | Atkinson Stephen | Vapour absorbent compositions |
US5964103A (en) * | 1995-10-06 | 1999-10-12 | Hitachi, Ltd. | Absorption refrigerator and production method thereof |
US5653117A (en) * | 1996-04-15 | 1997-08-05 | Gas Research Institute | Absorption refrigeration compositions containing thiocyanate, and absorption refrigeration apparatus |
US5783104A (en) * | 1996-04-16 | 1998-07-21 | Gas Research Institute | Absorption refrigeration compositions having germanium based compounds |
US6004475A (en) * | 1996-06-27 | 1999-12-21 | Fmc Corporation | Corrosion inhibiting solutions for refrigeration systems comprising heteropoly complex anions of transition metal elements |
US6033595A (en) * | 1996-07-18 | 2000-03-07 | Fmc Corporation | Corrosion inhibiting solutions and processes for refrigeration systems comprising halides of a Group Va metallic element |
US6083416A (en) * | 1996-07-18 | 2000-07-04 | Fmc Corporation | Corrosion inhibiting processes for refrigeration systems |
US5811026A (en) * | 1996-08-14 | 1998-09-22 | Phillips Engineering Company | Corrosion inhibitor for aqueous ammonia absorption system |
US6177025B1 (en) * | 1998-11-17 | 2001-01-23 | University Of Utah | Absorption heat pumps having improved efficiency using a crystallization-inhibiting additive |
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US6430942B1 (en) | 2002-08-13 |
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