DE10259555A1 - Insulating container for transport of liquefied gas, made of insulating vacuum panels - Google Patents

Abstract

The insulating panels are provided with a core made of a powder or fibers like micro porous silicic acid, or a porous foam like polystyrol or PU. The core is accommodated in a cover made of a metal foil, a foil consisting mainly of metal, or a metal coated foil, serving as a gas tight barrier. In order to create a perfect insulating effect a vacuum is created inside the cover, which can be filled with carbon dioxide, krypton, or argon. The condensation caused by the gasses increases the strength of the vacuum.

Description

The invention relates to an insulation body solid filling material.

For cryogenic liquefied Gases are used for storage and transportation with a thermal container Vacuum insulation used. The vacuum insulation consists in the Usually from an evacuated double-walled jacket.

So-called vacuum insulation panels are known as highly heat-insulating panels. These have a high thermal insulation with minimal thickness. They consist of a pressure-resistant core material and an envelope made of high-barrier film that is evacuated. Vacuum insulation panels are used, for example, in the DE 199 04 799 A1 and the DE 101 14 633 A1 described.

The object of the invention is that Insulation properties of vacuum insulation panels and similarly built insulators to improve.

The task is solved by an insulation body with the features described in claim 1.

The insulating body has a gastight envelope (e.g. wrapping made of foil) or a gas-tight body (e.g. container) and a solid filling material on and contains at least one of the gases (based on normal conditions) carbon dioxide, Krypton or Argon at a total gas pressure of less than one bar absolute. The gas or gas mixture in the insulation body usually contains carbon dioxide, Krypton or argon in a concentration of at least 10 percent by volume, preferably at least 30 percent by volume, particularly preferably at least 50 volume percent, in particular at least 80 volume percent. Advantageous the gas or gas mixture consists of carbon dioxide, krypton and / or Argon.

Preferred filling materials are open-pore plastic foams or microporous Powder, especially microporous Silica powder or airgel powder.

The material of the envelope (envelope or Body) is a plastic-containing material such as plastics, in particular cold weather Plastics. As cold resistant Plastics there are thermoplastic and thermosetting plastics, e.g. Polycarbonate or epoxy resin. Fiber-reinforced plastics are advantageous like glass fiber reinforced Plastics, e.g. glass fiber reinforced Epoxy resin or polyester resin. The preferred wrappings (e.g. containers, cover) usually consist partly or completely of low-temperature plastics.

The insulating body is preferably at storing or transporting a cryogenic liquid or solidified gas or gas mixture such as liquid nitrogen, liquid or solid carbon dioxide or liquid Air used, especially for an insulated container.

The insulating body or jacket is preferably a vacuum insulation panel or is like a vacuum insulation panel built up. Vacuum insulation panels are usually based on one flat support and thermal insulation body (insulation core) a powder or fibrous Material (e.g. microporous silicas) or an open-cell foam (e.g. polystyrene, polyurethane) that from an evacuated enclosure is surrounded by foil. The preferred material for the insulation core consists of a pressed, microporous Powders such as fumed silica, Airgel powder or precipitated silica. The insulating core is preferably with a wrapper packed gastight. The wrapping the vacuum insulation panels are generally made of metal, metal-containing (e.g. aluminum-containing), metal-coated or metal-clad Plastic films. The plastic films used serve as a barrier film and are gastight. In particular, commercially available special ones are used High barrier films (e.g. metal-coated plastic composite films), which have a gas pressure increase of no more than 2 mbar per year. The vacuum generated in the vacuum insulation panels corresponds to Generally an absolute pressure in the range of 0.01 to 100 mbar (absolute), advantageously from 0.01 to 10 mbar, particularly preferred Range from 0.01 to 2 mbar, in particular from 0.01 to 1 mbar.

With a vacuum insulation body the vacuum (the negative pressure) in the insulating body, in particular in the Vacuum insulation panels, preferably less than 20 mbar (absolute), particularly preferably 0.01 to 1 mbar. To improve thermal Isolation properties in particular at the negative pressure mentioned a gas filling of the evacuated or evacuable room with carbon dioxide, krypton or argon are particularly advantageous. The subject of the invention are hence vacuum insulation panels that contain carbon dioxide, krypton or Contain argon, especially in a reduced pressure atmosphere (negative pressure). The reduced pressure atmosphere of the evacuated room advantageously consists of carbon dioxide, krypton and / or argon. Such an insulating body is particularly cheap for use in cold liquefied Gases like liquefied nitrogen, liquefied Oxygen or liquefied air. Through the cold the gases carbon dioxide, krypton and argon are condensed the vacuum in the insulating body is improved.

Vacuum insulation panels, their manufacture and materials used are described, for example, in the DE 40 29 405 A1 . DE 101 14 633 A1 and DE 199 04 799 A1 , which is hereby incorporated by reference. Commercially available and suitable vacuum insulation panels have, for example, the following properties: a thermal conductivity of 0.004 W / (mK) at 10 ° C; a core material made of a microporous silica plate with a density in the range of 160 to 180 kg / m3; a cover made of metallized, highly vacuum-tight plastic film; Standard size 1.0 × 0.5 m, other sizes available; Thickness: 10 mm to 40 mm, typically 20 mm; right-angled edge formation, almost seamless jointing possible. In such vacuum insulation panels, for example, a fleece is arranged between the powder core and the plastic film. Such vacuum insulation panels are available, for example, from va-Q-tec AG in D-97080 Würzburg.

Claims (10)

insulator with a gastight cover or a gas-tight body, containing a solid filler at least one of the gases carbon dioxide, krypton or argon at one Total gas pressure of less than one bar absolute. insulator according to claim 1, characterized in that the insulating body a Absolute internal pressure in the range of 0.01 to 500 mbar. insulator according to claim 1 or 2, characterized in that the gas-tight Shell or the gas-tight body Contains plastic. insulator according to one of the claims 1 to 3, characterized in that the gas-tight body container is. insulator according to one of the claims 1 to 4, characterized in that the insulating body Vacuum insulation panel is. insulator according to one of the claims 1 to 5, characterized in that the filling material is an open-pore Foam or a microporous Powder is. insulator according to one of the claims 1 to 6, characterized in that the insulating body is flat or is cylindrical. insulator according to one of the claims 1 to 7, characterized in that the insulating body for direct or indirect contact with liquid nitrogen is designed. Use of an insulating body according to one of claims 1 to 8 for insulated containers for transport of cold liquefied or work hardened Gas. Use according to claim 9, characterized in that that the insulator in a cooling device is arranged.