EP2357433A1 - Clenche de gaz inerte sur systèmes d'absorption fermés - Google Patents

Clenche de gaz inerte sur systèmes d'absorption fermés Download PDF

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Publication number
EP2357433A1
EP2357433A1 EP10001445A EP10001445A EP2357433A1 EP 2357433 A1 EP2357433 A1 EP 2357433A1 EP 10001445 A EP10001445 A EP 10001445A EP 10001445 A EP10001445 A EP 10001445A EP 2357433 A1 EP2357433 A1 EP 2357433A1
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EP
European Patent Office
Prior art keywords
inert gas
cavity
working fluid
valve
gas trap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10001445A
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German (de)
English (en)
Inventor
Maier-Laxhuber Dr. Peter
Schmidt Dr. Ralf
Wörz Dipl.-Ing. Reiner
Becky Andreas
Richter Gert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zeo Tech Zeolith Technologie GmbH
Original Assignee
Zeo Tech Zeolith Technologie GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zeo Tech Zeolith Technologie GmbH filed Critical Zeo Tech Zeolith Technologie GmbH
Priority to EP10001445A priority Critical patent/EP2357433A1/fr
Publication of EP2357433A1 publication Critical patent/EP2357433A1/fr
Withdrawn legal-status Critical Current

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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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/04—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for withdrawing non-condensible gases
    • F25B43/046—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for withdrawing non-condensible gases for sorption type systems

Definitions

  • the invention relates to devices and methods for removing interfering inert gases from closed, periodically operating sorption systems according to the preamble of claims 1 and 11.
  • Inert gases may be presorbed in the sorbent as well as in the working fluid, released by chemical reactions, outgassed from the existing materials (vessel walls, sealants, heat exchangers, etc.) or leaked into the system.
  • the interfering inert gases or vapors prevent a rapid sorption process, as they impede the access of the vaporous working medium to the sorbent, which in turn can lead to a significant slowing down of the generation of cooling or heat. A significant decline in performance of these sorption systems is the result.
  • zeolite In sorption systems, the use of zeolite as a sorbent and of water as a working medium has proven to be advantageous. Zeolites have a very good ability to absorb water. It releases large amounts of heat of sorption. In addition, water has a high evaporation and solidification enthalpy, so that this pair of substances is particularly suitable for heating and cooling processes according to the sorption principle.
  • this pair of substances in particular the inert gases hydrogen, hydrocarbons and CO 2 occur in sorption systems. If these gases, which are inert for the sorption process, are not removed from the vacuum system, the sorption process is noticeably impeded.
  • the DE 4444252 discloses the use of the binding agent Ca (OH) 2 to bind the foreign gas CO 2 in a sorption system which works with the substance pairing of water-zeolite.
  • Object of the present invention is to permanently remove interfering inert gases in closed, periodically operating sorption from the sorption process throughout the term.
  • the invention utilizes the phenomenon that flowing working agent vapor entrains inert gases and concentrates where the working fluid condenses during the desorption phase.
  • an inert gas trap is connected to this collection point, through the input valve working medium vapor together with entrained inert gas can flow into a cavity located behind it.
  • the inlet valve is arranged so that the cavity side always remains a residue of liquid working fluid and thus blocks the inert gas the way back into the sorption. Liquefied working fluid collects in the cavity in addition to the inert gases. The latter must be able to get back into the sorption cycle.
  • the inlet valve remains open in the cavity until the liquid working medium is pressed back into the sorption system with decreasing total pressure.
  • the inlet valve before inert gas can escape, the inlet valve must close.
  • the input valve is advantageously configured as a float valve, which floats on liquid working fluid and keeps the valve floating while floating.
  • the input valve closes automatically before the entire working fluid has flowed back is.
  • the inert gas thus remains separated with a small amount of working fluid in the cavity.
  • the input valve may be provided with a control that opens the valve as soon as the sorption system is at a higher pressure than in the cavity and then closes when a minimum fluid level is reached at lower system pressure.
  • the input valve is designed as a float valve, which floats on liquid working fluid while keeping the valve open.
  • the valve itself can be designed as a small opening in the lower region of the cavity, which in turn can be closed by a sucker-shaped, flexible bellows as soon as the float body touches the bellows with decreasing working fluid level.
  • the weight of the float must therefore be large enough to securely close the opening before the inert gas can flow back.
  • the float is lifted by the working medium vapor entering the cavity.
  • a separate valve control is not necessary in this construction.
  • the float may e.g. be made inexpensively from the plastic polypropylene (PP).
  • PP polypropylene
  • the cavity may be designed for the total amount of inert gas expected during the service life of the sorption system. However, if the cavity required for this purpose can not be accommodated in the construction volume of the sorption system, a recurring removal of the collected inert gas is necessary.
  • the inert gas must be removed.
  • several measures are suitable. For one thing, over an outlet valve from time to time the inert gas to be blown off. However, this is only possible with tools that have an overpressure at ambient temperatures.
  • the residual water in the cavity (for example by means of an electric heater) must be heated to temperatures above 100 ° C. If the outlet valve is designed as a pressure relief valve, the purging takes place without further intervention.
  • the time for a heating of the residual water can also be determined via the temperature difference signal of two temperature measuring points. Since the working medium vapor always flows into the cavity in the lower region and consequently the inert gas is forced into the upper region of the cavity, depending on the proportion of inert gas, a more or less pronounced temperature difference occurs. Without inert gas, the two temperatures are identical. The more inert gas is accumulated, the greater the temperature difference.
  • the liquefaction temperature of a sorption system is e.g. 60 ° C, at an ambient temperature of 25 ° C, a maximum difference of 35 K may be set as the starting value for the heating of the working fluid remaining in the cavity. At higher condensation temperatures, the temperature difference may also be 70 K or above.
  • a shutdown of the heating can be carried out according to the invention via the same temperature difference signal. Namely, as soon as the inert gas is blown out of the cavity, concentrated working fluid vapor also in the upper region. The temperature difference is thus immediately smaller and can thus serve as a shutdown signal for the heater.
  • inert gases can also be pumped out of the cavity on a regular basis.
  • vacuum pumps can do this, as their necessary final pressure only has to be slightly below the highest system pressure during desorption.
  • the vacuum pump only has to reach a final pressure below 200 mbar.
  • the outlet valve may advantageously be formed as a one-way valve. The vacuum pump can advantageously be operated manually.
  • the opening and closing of a cold room door or a cold box lid may e.g. be coupled via a mechanical transmission system with the lifting movement of a small diaphragm pump. With each door or lid operation, a slight negative pressure is automatically generated in order to re-evacuate the sorption system of the cold room on demand or permanently.
  • reaction substances for the inert gas carbon dioxide (CO 2 ), reaction substances are known which form a chemical or physical bond with CO 2 and which do not release any other interfering gases or vapors when binding and holding CO 2 . Consequently, advantageous are reactants which convert to carbonates in the presence of CO 2 . Accordingly, soda lime is suitable for the binding of CO 2 as it is used today in circulatory respiratory protective devices and anesthesia devices.
  • the reaction substance contains predominantly calcium hydroxide Ca (OH) 2 and sodium hydroxide NaOH. Ca (OH) 2 then reacts with absorption of CO 2 to form CaCO 3 .
  • this reaction substance is disposed within the cavity. In particular, the upper portion of the cavity is ideally suited for the reaction material since there is the inert gas with the highest concentration.
  • a sorbent container 2 contains a zeolite filling and a heat exchanger 3 for heating and cooling the zeolite filling.
  • a line 10 is connected above the maximum water level, which leads to an input valve 19 with underlying cavity 13.
  • the input valve 19 consists of a cylindrical polypropylene floating body 14, which includes a sucker-shaped bellows 15 at the lower end, with which it can close an opening 16 to 10 line, as soon as the water level 17 has dropped to the bottom of the cavity 13 so far that the Bellows 15 rests on the opening 16.
  • In the upper region of the cylindrical cavity 13 there is an outlet valve 18 via which with the help of a dockable vacuum pump (not shown) of the cavity 13 and via the line 10, the entire sorption system 1 can be evacuated.
  • the sorption system 1 operates periodically. During each desorption phase, the zeolite is heated via the heat exchanger 3 to high temperatures (eg 200 ° C). The water vapor pressure in the sorbent container 2 thereby increases. Water vapor flows via the steam channel 5 into the condenser 6. With release of heat, the vapor liquefies at temperatures of about 60 to 80 ° C. The condensate flows into the sump 7. There it jams, since the valve 8 is closed to the evaporator during the desorption phase. A portion of the water vapor flowing out of the sorbent entrains inert gases into the collecting container 7 and from there through the line 10 to the opening 16 below the floating body 14.
  • high temperatures eg 200 ° C
  • the water vapor pressure in the sorbent container 2 thereby increases. Water vapor flows via the steam channel 5 into the condenser 6. With release of heat, the vapor liquefies at temperatures of about 60 to 80 ° C. The condensate flows into the sump 7. There it jams
  • Fig. 2 shows an inert gas trap, similar to in Fig. 1 , extended by a heater 20 in the region of the residual liquid 21 and two temperature sensors 22, 23 in the lower and upper region of the cavity 24.
  • the line 10 in turn opens in the lower region of a cylindrical cavity 24.
  • a fixed at the end of the line 10, flexible suction 26th forms the valve seat for the floating floating body 27, which is guided by the cylindrical cavity 24 in accordance with the state of the residual liquid on the nipple or floating freely.
  • the difference between the two temperature sensors 22, 23 is evaluated by a controller 25, which sets the heater 20 in operation when a preset temperature difference is exceeded and switches off again when falling below a smaller difference selected.
  • the process of removing inert gas from the cavity 24 is now completely self-regulating.
  • the two temperature sensors 22, 23 are at ambient temperature.
  • water vapor now enters the cavity 24 from below and condenses uniformly in all areas, provided that no or only little inert gas is present. However, if there is a lot of inert gas in the cavity 24, it condenses only in the lower region, while in the upper part, the temperature hardly rises.
  • the controller 25 detects this and sets when exceeding the preset difference, the electric heater 20 in operation. The temperature of the residual liquid 21 then rises until the total pressure in the cavity 24, the pressure relief valve 28 opens slightly to the environment and squeezes the inert gas from the inert gas trap.
  • the incoming water vapor condenses instantly even in the colder, upper area and raises the temperature at the upper temperature sensor 23.
  • the difference in the controller 25 falls below the lower setpoint and switches off the heater 20 again.
  • the cavity 24 is now free of inert gas and can again accumulate inert gas from the following desorption phase until at some point the regulator 25 responds again and causes the discharge of inert gas.
  • FIG. 3 shows another, inexpensive inert gas trap for a simple sorption 1 with the fabric pair zeolite-water.
  • a gas-tight cylinder 30 Within a gas-tight cylinder 30 is located in the upper region of a zeolite filling 31, which is heated by a heat carrier circuit 32 and cooled. In the lower region, a heat exchanger 33 is arranged, which absorbs heat during the desorption phase and releases heat to the surrounding, evaporating water 34 during the adsorption phase. The water level 35 thus fluctuates within a minimum and maximum level, depending on the operating state of the sorption is currently.
  • the inert gas trap is also disposed within the cylinder 30. Its cavity 36 is partially bounded by the gas-tight cylinder 30 and thus has a cooling surface 37 to the outside.
  • the water vapor flowing into the cavity can condense and the flow can be maintained.
  • the other interfaces 38 of the cavity 36 point inwards.
  • a bore 39 In the lowest part of the cavity 36 is a bore 39, which opens slightly above the maximum level 35.
  • the bore 39 can be closed on the cavity side by a flexible suction device 40, which is fastened to the lower end of the floating body 41.
  • a reagent 42 In the upper region of the cavity 36 is a reagent 42 for the chemical bonding of carbon dioxide, the main component of the separated inert gas. Soda lime contained in the reactant 42 reacts with carbon dioxide to form insoluble calcium carbonate (CaCO 3 ) with release of a water molecule.
  • the cavity 36 itself has no outlet valve, since the void volume is sufficiently sized.
  • the cylinder 30 tilted so that the float 41, the bore 39 can be released for evacuation. After evacuation, the cylinder 30 is returned to the operating state. The cavity 36 is now ready for buffering inert gases.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation Of Gases By Adsorption (AREA)
EP10001445A 2010-02-12 2010-02-12 Clenche de gaz inerte sur systèmes d'absorption fermés Withdrawn EP2357433A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10001445A EP2357433A1 (fr) 2010-02-12 2010-02-12 Clenche de gaz inerte sur systèmes d'absorption fermés

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10001445A EP2357433A1 (fr) 2010-02-12 2010-02-12 Clenche de gaz inerte sur systèmes d'absorption fermés

Publications (1)

Publication Number Publication Date
EP2357433A1 true EP2357433A1 (fr) 2011-08-17

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EP10001445A Withdrawn EP2357433A1 (fr) 2010-02-12 2010-02-12 Clenche de gaz inerte sur systèmes d'absorption fermés

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011011308A1 (de) 2011-02-15 2012-08-16 Zeo-Tech Zeolith-Technologie Gmbh Solar betriebener Sorptionsapparat
WO2014041034A1 (fr) * 2012-09-11 2014-03-20 Invensor Gmbh Récipient de collecte et procédé de récupération de fluide de travail dans des dispositifs de sorption
US9631851B2 (en) 2010-11-23 2017-04-25 Invensor Gmbh Vacuum container for removing foreign gases from an adsorption refrigeration machine
DE102019105387A1 (de) * 2019-03-04 2020-09-10 Mahle International Gmbh Sorptionswärmeübertragungsmodul
EP3882526A1 (fr) * 2020-03-19 2021-09-22 Vaillant GmbH Phase de séparation
DE102023102022A1 (de) 2023-01-27 2024-08-01 Coolar UG (haftungsbeschränkt) Gasfalle zur entfernung von fremdgasen aus einer sorptionskälteanlage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131546A (en) 1962-03-28 1964-05-05 Carrier Corp Purge arrangements
US3360950A (en) 1965-11-30 1968-01-02 Carrier Corp Purge arrangement for absorption refrigeration systems
DE4444252A1 (de) 1994-12-13 1996-06-20 Zeolith Tech Verfahren und Vorrichtung zum Entfernen störender Gase oder Dämpfe aus Sorptionssystemen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3131546A (en) 1962-03-28 1964-05-05 Carrier Corp Purge arrangements
US3360950A (en) 1965-11-30 1968-01-02 Carrier Corp Purge arrangement for absorption refrigeration systems
DE4444252A1 (de) 1994-12-13 1996-06-20 Zeolith Tech Verfahren und Vorrichtung zum Entfernen störender Gase oder Dämpfe aus Sorptionssystemen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9631851B2 (en) 2010-11-23 2017-04-25 Invensor Gmbh Vacuum container for removing foreign gases from an adsorption refrigeration machine
DE102011011308A1 (de) 2011-02-15 2012-08-16 Zeo-Tech Zeolith-Technologie Gmbh Solar betriebener Sorptionsapparat
WO2014041034A1 (fr) * 2012-09-11 2014-03-20 Invensor Gmbh Récipient de collecte et procédé de récupération de fluide de travail dans des dispositifs de sorption
DE102019105387A1 (de) * 2019-03-04 2020-09-10 Mahle International Gmbh Sorptionswärmeübertragungsmodul
EP3882526A1 (fr) * 2020-03-19 2021-09-22 Vaillant GmbH Phase de séparation
DE102020107579A1 (de) 2020-03-19 2021-09-23 Vaillant Gmbh Trennphase
DE102023102022A1 (de) 2023-01-27 2024-08-01 Coolar UG (haftungsbeschränkt) Gasfalle zur entfernung von fremdgasen aus einer sorptionskälteanlage
WO2024156918A1 (fr) 2023-01-27 2024-08-02 Coolar UG (haftungsbeschränkt) Procédé et système de réfrigération par sorption avec piège à gaz pour éliminer des gaz étrangers

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