DE202013101663U1 - Transport container for a compressed gas packaging - Google Patents

Abstract

Transport container (1) for at least one compressed gas packaging with a volume of at most 50 liters, wherein the transport container (1) has a transport space (2) for the at least one compressed gas packaging and a thermal insulation (3) of the transport space (2) and wherein within the thermal Insulation (3) at least one latent heat storage (4) is arranged.

Description

The present invention relates to a transport container for at least one pressurized gas packaging with a volume of at most 50 liters. In the compressed gas packaging are in particular monogases or gas mixtures, which are used for analytical purposes. The transport container has a transport space for the compressed gas packaging and a thermal insulation of the transport space.

For the calibration and calibration of measuring instruments, the calibration and calibration gases used must comply with legal requirements. In order to confirm compliance with the legal requirements with regard to the narrow tolerances for production and analysis of the gas mixtures used, a certificate is issued by a state-recognized body. Part of the certificate is compliance with defined boundary conditions for the storage and transport of the gas mixtures from the manufacturer to the end customer and the end customer. Such a certificate is issued, for example, by the Open Grid Europe or the test center GH 80 according to the certification PTB A7.63.

In the case of multicomponent gas mixtures, there is the risk that at least partial condensation of gaseous gas mixture components may occur when the compressed gas packaging is cooled. The condensation of the components can already occur at temperatures well above the dew point of the mixture, which leads at least temporarily to a uselessness of the mixture. The usability can be restored if the gas mixture is tempered and rehomogenised before the first use of the mixture.

Therefore, issuing the certificate requires that gas mixtures do not fall below a temperature of 0 ° C, so that the properties of the gas mixtures remain stable. This has in practice meant that delivery of the gas mixtures did not occur at temperatures below freezing or that the gas mixtures had to be transported in a van with a heated cargo area. As a result, the delivery of the gas mixtures is delayed and / or more expensive.

On the other hand, it is also known that some gases adversely affect their properties at higher ambient temperatures, so that transport at temperatures, for example, above 25 ° C in summer is problematic. For example, the gas diborane is sensitive to heat.

It is therefore an object of the present invention to at least partially solve the disadvantages described with reference to the prior art. In particular, a transport container should be specified, which allows to transport temperature-sensitive gases or gas mixtures in winter and summer, with the properties of the transported gas or gas mixture remain stable, so do not change their properties.

These objects are achieved with a transport container having the features of the independent claim. Advantageous developments are specified in the dependent claims. It should be noted that the features listed individually in the dependent claims can be combined with each other in any technologically meaningful manner and define further embodiments of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, wherein further preferred embodiments of the invention are shown.

The object is achieved in particular with a transport container for at least one pressurized gas packaging having a (geometric) volume of at most 50 liters, wherein the transport container has a transport space for the compressed gas packaging and a thermal insulation of the transport space and wherein at least one latent heat storage is disposed within the thermal insulation.

As compressed gas packaging in particular those containers are meant that are suitable for the transport and storage of gases under pressure (up to 300 bar). Compressed gas packaging is preferably compressed gas cartridges with a volume up to about 1 liter and compressed gas cylinders with a volume of 1 to 50 liters. Compressed-gas cartridges are also referred to as pressurized gas cans. The compressed gas packages suitable for the transport container provided in the present invention are preferably made of metal, in particular of a metal which is suitable for receiving the corresponding gas or gas mixture, ie it does not react with the gas or the gas mixture or influences its properties.

As a transport space in particular the space in the transport container is to be understood, which is taken during transport of the compressed gas packaging of this. The transport space is preferably limited by recordings, brackets or the like, which fix the compressed gas packaging during transport in the transport space. If several compressed gas packages are transported with a transport container, the transport space represents the sum of the spaces occupied by the compressed gas packages.

The transport space is preferably surrounded by the thermal insulation in one direction, particularly preferably in the radial direction to the compressed gas packaging. Most preferably, the thermal insulation completely surrounds the transport space. Thus, the thermal insulation between the transport space and an outer shell of the transport container (for example, the housing) is arranged. The thermal insulation may be of any material suitable for thermal insulation. In the simplest case, the thermal insulation is given by the air surrounding the transport space. Preferably, however, the thermal insulation is at least partially or completely formed by a thermally insulating material, for example polyurethane foam. In addition, the thermal insulation on the at least one latent heat storage. Alternatively, the latent heat storage itself can form the complete thermal insulation. Preferably, the thermal insulation has a thermal conductivity of less than 0.1 W / mK [watts per meter and Kelvin], more preferably less than 0.05 W / mK.

Latent heat stores are also known as "phase change materials" (PCM). Latent heat storage devices are based on the fact that when they change their state of aggregation (phase change) they absorb or release more thermal energy than they would do on account of their normal specific heat capacity in one phase (for example solid or liquid). In most cases, the aggregate state change (phase transition) from solid to liquid or vice versa is utilized. By the use of latent heat storage, the cooling or heating of the compressed gas packaging during transport at high temperature differences to the ambient temperature to a value below or above a critical temperature is delayed so long that the properties of the gas or gas mixture in the compressed gas packaging remain stable and thus a transport can be done to a temperature-controlled bearing point.

According to an advantageous embodiment of the invention, the latent heat storage and / or the thermal insulation are shaped so that the compressed gas packaging can be held by them positively.

The pressurized gas packaging facing surface of the latent heat accumulator and / or the thermal insulation is thus shaped so that it corresponds to the outer shape of the compressed gas packaging. Thus, the compressed gas packaging is firmly held by the thermal insulation and / or the latent heat storage in the transport container.

It is also preferred that the latent heat storage and the compressed gas packaging are arranged interchangeable within the thermal insulation. Thus, not only the compressed gas packaging for transport in the transport container can be easily replaced, but also the latent heat storage. This has the advantage that the transport container can be equipped with a previously externally conditioned by the transport container latent heat storage and thus can be used again quickly after previous use without the previously used latent heat storage must be conditioned again. Thus, however, the latent heat storage can be conditioned independently of the compressed gas cylinder and the other components of the transport container. The interchangeability of the latent heat storage and the compressed gas packaging can be achieved that the material of the thermal insulation is shaped so that the compressed gas packaging and the latent heat storage are held by the thermal insulation form-fitting. Alternatively or cumulatively, detent devices for the pressurized gas packaging and / or the latent heat accumulator may be provided in the transport container. The latent heat storage and the compressed gas packaging can also be arranged so that they are in heat-conducting contact with each other.

According to a further advantageous embodiment, the transport container has a double-walled housing, wherein in a space of the double-walled housing, the thermal insulation and / or the latent heat storage is arranged. It is preferred that the outer wall of the housing is shaped so that the transport container is easy to handle and transport and the inner wall of the housing is shaped so that it can accommodate the compressed gas packaging. In the space between the inner wall and the outer wall of the latent heat storage and / or thermal insulation can be arranged. Such a double-walled housing is preferably molded from a plastic. Thus, a production of the transport container is inexpensive in large quantities possible.

It is also advantageous if the latent heat storage during transport of a compressed gas packaging with this in heat-conducting contact.

Due to the heat-conducting contact, a nearly homogeneous temperature distribution in the transport container can be realized.

Preferably, the latent heat storage can perform a phase transition in a temperature range in which the properties of the gas or gas mixture to be transported in the compressed gas package are stable.

This phase transition is preferably an aggregate state change from solid to liquid or vice versa. The latent heat storage material used is preferably salt hydrates, fatty acids, silicones, oils and / or paraffins. Depending on the temperature range, the latent heat storage material is in the liquid or solid phase. The latent heat store containing the latent heat storage material may preferably be in the form of plates or granules, wherein the latent heat storage material is held in a matrix-like tissue.

According to a further advantageous embodiment of the transport container of the latent heat storage performs a phase transition in a temperature range of -5 ° C to 40 ° C from.

According to yet another advantageous embodiment of the transport container, the latent heat storage performs a phase transition in a temperature range of -5 ° C to 20 ° C, preferably in a temperature range of 0 ° C to 10 ° C or to 15 ° C.

By so configured latent heat storage is achieved that a cooling of the compressed gas packaging is slowed down at an ambient temperature below -5 ° C or 0 ° C, so that a transport of pressurized gas at temperatures below freezing point without condensing components of the gas mixture in the compressed gas packaging can. Thus, for such latent heat accumulators, a mixture of saturated n-paraffinic hydrocarbons from petroleum (empirical formula: C _n H _{2n + 2} ) is particularly preferably used as the latent heat storage material whose phase transition is in a corresponding temperature range. The temperature at which the phase transition takes place is thereby set by the length (n) of the hydrocarbon chains.

Alternatively, the latent heat storage performs a phase transition in the temperature range of 20 ° C to 40 ° C, more preferably in the temperature range of 25 ° C to 35 ° C, from. By such a latent heat storage prevents the temperature of the compressed gas packaging is rapidly increased during transport, when the ambient temperature is above 25 ° C or 35 ° C or 40 ° C. Again, a mixture of saturated n-paraffinic hydrocarbons from petroleum (empirical formula: C _n H _{2n + 2} ) can be used, the phase transition is in a corresponding temperature range.

A further advantageous embodiment of the transport container provides that the thermal insulation and the latent heat storage are designed so that a transported compressed gas packaging within a given period, especially within 24 hours or even within 48 hours, with a vorgebaren temperature difference, especially at a temperature difference of 30 K [Kelvin], between the compressed gas packaging and the environment outside the transport container, its temperature by not more than a predetermined value, in particular by not more than 20 K, preferably by not more than 15 K, most preferably by not more than 10 K or not more than 5 K, changes.

Such a design of the transport container ensures that the transported compressed gas packaging does not exceed or fall below a critical temperature during transport, so that the properties of the gas or gas mixture remain stable. This embodiment is achieved by suitable choice and dimensioning of the thermal insulation and the latent heat storage.

According to a further advantageous embodiment of the transport container, this has a metallic outer shell, preferably made of an aluminum alloy, and is designed in particular in the manner of a suitcase, a pallet or a cabinet.

The transport container thus consists of a metallic box open on one side, which can be closed by means of a lid or a door. Thus, easy handling of the transport container with respect to the loading or unloading of the compressed gas packaging and the transport of the container is ensured.

It is also considered advantageous that the thermal insulation of a plastic foam, in particular a plastic foam made of polyurethane, or the like is formed with molded first free spaces for receiving one or more compressed gas packaging and with second spaces for receiving one or more latent heat storage, the first and the second free spaces communicate with each other or merge. Such a configuration of the thermal insulation ensures that the latent heat storage and the compressed gas packaging are interchangeable. In this case, the first free space extending from the transport space to the outer shell of the transport container and the first space to define the transport space.

It is also considered advantageous if the latent heat storage has a latent heat storage material and a matrix in which the Latent heat storage material is embedded. The latent heat storage can thus be designed in any shape, in particular in the form of granules or plates.

It is also preferred that the transport container is designed to accommodate two, three or more bottles.

This means in particular also that the transport space is shaped so that a corresponding number of bottles can be received, which are each held at least partially positive fit in the thermal insulation and are at least partially in heat-conducting contact with the latent heat storage.

Furthermore, it is also proposed that the transport container according to the invention for the transport of a monogase or gas mixture for testing, calibration or calibration purposes, in particular for natural gas or Biogasbeschaffenheitsmessungen at ambient temperatures outside the temperature range in which the properties of the gas mixture in question are stable. According to Open Grid Europe certification, test gas mixtures must not exceed a temperature of 0 ° C.

A transport of test gas mixtures can thus be carried out even at temperatures below freezing, without a van with a heated cargo area must be used, so that the properties of the test gas mixtures remain stable. Advantageously, the individual constituents used to prepare a test, calibration or calibration gas mixture have a purity of at least 99.0% by volume, preferably of at least 99.9% by volume, particularly preferably of at least 99.995% by volume. , When producing the gas mixtures, a deviation of not more than 5%, preferably not more than 2%, relative to the nominal value is to be observed for constituents with a mole fraction of at least 0.1%. For components with smaller molar proportions, the manufacturing tolerance may be a maximum of 10%, preferably a maximum of 5% relative. Alternatively, test, calibration or calibration gases impurities of at most 1%, preferably at most 0.1%, or even at most 0.01%.

• – Konditionieren zumindest eines Latentwärmespeichers auf eine erste Starttemperatur,
• – Einbringen des Latentwärmespeichers in den Transportbehälter,
• – Einbringen der Druckgasverpackung in den Transportbehälter.

Also proposed is a method for transporting a gas or gas mixture in a compressed gas package for testing, calibrating or calibrating purposes in a transport container, in particular in a transport container according to the invention, comprising the following steps:

• Conditioning at least one latent heat accumulator to a first starting temperature,
• Introducing the latent heat accumulator into the transport container,
• - Introducing the compressed gas packaging in the transport container.

At low outside temperatures (below the freezing point), the latent heat storage is preferably conditioned to a first temperature of 15 ° C to 25 ° C, most preferably to a first temperature of 18 ° C to 22 ° C. It is particularly preferred if, at low outside temperatures, the complete transport container is conditioned with the compressed gas packaging to the first temperature. This ensures that the gas or gas mixture to be transported has stable properties throughout the transport.

At high ambient temperatures, the latent heat storage is preferably conditioned to a first temperature of 0 C to 15 ° C, most preferably to a first temperature of 5 ° C to 10 ° C, or even from 0 ° C to 5 ° C. Again, it is particularly preferred if at high outside temperatures of the complete transport container is conditioned with the compressed gas packaging to the first temperature. Thus, even at high temperatures it is achieved that the gas or gas mixture to be transported has stable properties throughout the transport. But it is sufficient if only the latent heat storage is conditioned to the first temperature.

By conditioning is meant that at least the latent heat storage, the compressed gas packaging or the transport container is heated or cooled to the appropriate temperature. With the introduction of the compressed gas packaging in the transport container is meant that the compressed gas packaging is placed or placed in the transport container and is fixed there accordingly. The latent heat storage can also be conditioned outside of the transport container. But it is also possible to condition the latent heat storage in the transport container together with the transport container.

It is preferred in the method that the temperature of the compressed gas packaging within 24 hours, preferably within 48 hours at a temperature difference of 30 K between the compressed gas packaging and the environment outside the transport container by not more than 20 K, preferably not more than 10 K. , changes.

The details and advantages disclosed for the method according to the invention can be applied to Transfer and apply device according to the invention and vice versa.

The invention and the technical environment will be explained by way of example with reference to the figures. It should be noted that the figures show, but are not limited to, particularly preferred embodiments of the invention. They show schematically:

1 : a first view of an opened transport container,

2 : a view of an open transport container without latent heat storage,

3 a cross section through a transport container, and

4 : A plan view of a further embodiment of a transport container according to the invention and

5 a cross section through a further embodiment of the transport container.

1 schematically shows a plan view of an open transport container 1 , The transport container 1 includes an outer shell 5 in which a thermal insulation 3 and a latent heat storage 4 are arranged. The latent heat storage 4 and the thermal insulation 3 are shaped so that they can accommodate a compressed gas packaging. The so of the latent heat storage 4 and thermal insulation 3 limited space provides a transportation space 2 for the compressed gas packaging dar. A compressed gas packaging is not in this representation in the transport container 1 , The compressed gas packaging can be easily in the transport room 2 be placed or laid, depending on how the transport container is placed. The transport container 1 can be closed with a lid, not shown, so that the transport container is a kind of suitcase. Alternatively, the transport container 1 be closed in a erect position with a door, so that the transport container 1 forms a kind of cabinet. Is a compressed gas packaging in the transport room 2 , This is in heat-conducting contact with the latent heat storage 4 , The latent heat storage 4 is replaceable in the transport container 1 arranged.

In 2 is a plan view of the transport container 1 in which the latent heat storage 4 not in the transport container 1 located. Between the thermal insulation 3 , For example, a polyurethane foam, are first free spaces 6 , which are suitable for receiving a compressed gas packaging. Between the thermal insulation 3 there are second free spaces 7 , which are for receiving the latent heat accumulator, not shown here 4 serve. This ensures that not only the compressed gas packaging can be easily replaced, but also the latent heat storage 4 if the transport container 1 must be re-equipped quickly.

In 3 is the transport container 1 in a cross section in the area of thermal insulation 3 shown. The transport container 1 includes an outer shell 5 in which is the thermal insulation 3 located. The thermal insulation 3 has a receptacle that has a first free space 6 forms for receiving the compressed gas packaging. So will a transport room 2 defined, in which the compressed gas packaging is in the transport.

4 schematically shows a further embodiment of the transport container 1 , The embodiment according to 4 differs from the embodiment according to 1 in that here is the thermal insulation 3 and the latent heat storage 4 are shaped so that in a transport room 2 three compressed gas packaging can be included.

In 5 is a schematic cross-section through another embodiment of a transport container 1 shown. The transport container 1 , has a double-walled housing with an inner wall 8th and an outer wall 9 on, between which there is a gap 10 located. In the gap 10 is a latent heat storage 4 filled, which is also the thermal insulation 3 forms. From the inner wall 8th becomes a transport space 2 limited, in which a compressed gas packaging can be adjusted. The outer wall 9 forms the outer shell 5 ,

With the transport container according to the invention 1 Temperature-sensitive gases can be transported in summer and in winter without having to take any further special precautions. Thus, for example, test, calibration or calibration gases in winter at temperatures below the freezing point in the transport container 1 be transported without condensation of components of the gas mixture, so that the properties of the test, calibration or calibration gases remain stable. Thus, gases or gas mixtures can be transported over a given period at a given temperature difference between compressed gas packaging and ambient temperature so that the properties of the gases or gas mixtures remain stable. Condensation of gases or gas mixture components or decomposition or polymerization of the gases or gas mixture constituents is avoided.

LIST OF REFERENCE NUMBERS

1

 transport container

2

 transport space

3

 Thermal insulation

4

 Latent heat storage

5

 outer shell

6

 first free spaces

7

 second free spaces

8th

 inner wall

9

 outer wall

10

 gap

Claims (14)

Transport container ( 1 ) for at least one pressurized gas packaging of a volume not exceeding 50 liters, the transport container ( 1 ) a transport space ( 2 ) for the at least one compressed gas packaging and a thermal insulation ( 3 ) of the transport space ( 2 ) and wherein within the thermal insulation ( 3 ) at least one latent heat storage ( 4 ) is arranged. Transport container ( 1 ) according to claim 1, wherein the latent heat storage ( 4 ) and / or the thermal insulation ( 3 ) are shaped so that the compressed gas packaging can be held by them positively. Transport container ( 1 ) according to claim 1 or 2, wherein the latent heat storage ( 4 ) and the compressed gas packaging interchangeable within the thermal insulation ( 3 ) are arranged. Transport container ( 1 ) according to claim 1, wherein the transport container ( 1 ) a double-walled housing ( 8th . 9 ), wherein in a space ( 10 ) of the double-walled housing the thermal insulation ( 3 ) and / or the latent heat storage ( 4 ) is arranged. Transport container ( 1 ) according to one of the preceding claims, wherein the latent heat storage ( 4 ) When transporting a compressed gas packaging with this in heat-conducting contact. Transport container ( 1 ) according to one of the preceding claims, wherein the latent heat storage can perform a phase transition in a temperature range in which the properties of the gas or gas mixture to be transported in the compressed gas package are stable. Transport container ( 1 ) according to one of the preceding claims, wherein the latent heat storage ( 4 ) can perform a phase transition in a temperature range of -5 ° C to 40 ° C. Transport container ( 1 ) according to one of the preceding claims, wherein the latent heat storage ( 4 ) can perform a phase transition in a temperature range of -5 ° C to 20 ° C. Transport container ( 1 ) according to one of claims 1 to 7, wherein the latent heat storage ( 4 ) can perform a phase transition in a temperature range of 20 ° C to 40 ° C. Transport container ( 1 ) according to one of the preceding claims, characterized in that the thermal insulation ( 3 ) and the latent heat storage ( 4 ) are designed so that a transported compressed gas packaging within a given period, in particular within 24 hours, at a vorgebaren temperature difference, in particular at a temperature difference of 30 K [Kelvin], between the compressed gas packaging and the environment outside the transport container ( 1 ) does not change its temperature by more than a predetermined value, in particular by not more than 20 K. Transport container ( 1 ) according to one of the preceding claims, wherein the transport container ( 1 ) Has a metallic outer shell and is designed in particular in the manner of a suitcase or cabinet. Transport container ( 1 ) according to one of the preceding claims, wherein the thermal insulation ( 3 ) of a plastic foam or the like with molded-in first free spaces ( 6 ) for receiving one or more compressed gas packaging (s) and with second free spaces ( 7 ) for receiving one or more latent heat storage devices (s) ( 4 ), wherein the first and second clearances communicate with each other or merge. Transport container ( 1 ) according to one of the preceding claims, wherein the latent heat storage ( 4 ) is formed from a granulate in which the latent heat storage material is embedded in a matrix. Transport container ( 1 ) according to one of the preceding claims, wherein the transport container ( 1 ) is designed to accommodate two, three or more compressed gas packages.

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