Cold chain ship
In ancient times, in order to eat fresh lychees thousands of miles away, people designed a simple and movable "fresh-keeping box", filled with cotton and wool between the double-layer wooden boxes, and then put ice cubes. The earliest prototype of cold chain transportation. Nowadays, in a highly developed and convenient modern society, logistics and transportation are becoming more and more efficient and efficient, and thermal insulation and cold preservation are closely related to people's lives. Various biological freezing reagents, medicines, plasma, vaccines, aquatic products, poultry, ornamental fish and long-distance foreign trade fresh-keeping food, etc., are delivered to people's homes safely, freshly and quickly through cold chain, logistics and transportation links. In this process, each link must always be in a specific low-temperature environment necessary for the product to reduce losses, prevent pollution and deterioration, and ensure product food safety, biosafety, and drug safety. In addition to the efficient and fast cold chain transportation end, in the cold storage system with large storage volume and long time, thermal insulation materials also shoulder a heavy responsibility. The heat transfer of the cold storage envelope and thermal insulation layer accounts for 20% to 35% of the total heat load of the cold storage, so it is necessary to reduce the heat load of the envelope structure to achieve the purpose of energy saving. In addition, it is necessary to prevent a variety of fire hazards, which has higher requirements for thermal insulation materials. Aerogel materials are fire-resistant and heat-insulating, have good heat-insulating effect, and have many features such as light weight, easy processing, and long service life. Compared with traditional materials, the thickness of the insulation layer is reduced and the transportation space is saved.
In addition, with the development of ocean transportation and offshore oil fields, the supporting offshore drilling platforms, oil carriers, liquefied natural gas (LNG) ships, and liquefied petroleum gas (LPG) ships have developed rapidly. These special ships put forward new requirements for thermal insulation and fire separation. The temperature involved in low-temperature and ultra-low temperature pipelines is mostly -40 to -170 degrees Celsius. In the construction of LNG/LPG projects and other low-temperature projects, the most commonly used cryogenic insulation materials are perlite, PUR/PIR (polyurethane rigid foam), Foamed glass, rubber and plastic, modified phenolic foam, etc. There are many problems in the use of these traditional materials, such as rapid performance decay, high maintenance cost, poor thermal insulation effect, and large cooling loss, which are easy to bring danger to the storage and transportation of natural gas or other compressed gases; There are many inconveniences in the layout design; the pipeline is corroded by water because of its poor waterproofness, and the waterproof effect is good but cannot meet the fire protection requirements. The aerogel material has excellent thermal insulation and cold insulation effect. At ultra-low temperature, the thermal conductivity is ≤0.02W/(m·K), which effectively reduces the cooling loss, and the required thickness of the insulation layer is greatly reduced, providing an optimized solution for the design of intensive pipeline layout. Excellent waterproof performance at low temperature, inhibits the penetration of water into the surface of metal pipelines, prevents pipeline corrosion and reduces the thermal insulation effect caused by water seepage. The superposition of many advantages has brought qualitative changes to the existing cryogenic cooling system.
Advantages of Aerogel Insulation Materials
Heat preservation and cold preservation: low thermal conductivity ≤0.02W/(m·K), strong low temperature stability, excellent performance can still be maintained for a long time at -200°, reducing cold loss;
Space saving: The required material thickness is greatly reduced under the same performance, which improves the space utilization rate;
Hydrophobicity and anti-corrosion: hydrophobicity rate N98%, strong waterproof performance at low temperature, anti-corrosion and anti-aging, resistant to various solvent erosion;
Compression and earthquake resistance: strong compression resistance in ultra-low temperature environment, three-dimensional porous network structure buffering and earthquake resistance;
Fire and flame retardant: A1 fire and non-combustible grade, can withstand high temperature up to 620 ℃;
Environmentally friendly and non-toxic: water-based inorganic materials, do not produce harmful or toxic substances to the human body at high temperatures;
Convenience in construction: It is convenient for cutting and processing, and the cutting and shaping can meet the design requirements of composite structures of various thicknesses.