The foam rises and completes the polyurethane. Finally, it is connected with the outer steel pipe in the form of foaming. The sliding form of the steam pipe must use the inner sliding, so the connection of each interface of the thermal insulation material must be tight. Pressure is a particularly noteworthy parameter in the process of polyurethane foaming into the outer layer. The foaming pressure varies with time. After the foaming material is injected, the pressure gradually rises, and after reaching the highest value, it gradually decreases.
The foaming process needs to be stopped at the maximum point of foaming pressure in the figure to ensure the best density.
4.5 Technical requirements for moisture-discharging devices Most of the insulation materials used in traditional direct-buried pipelines contain moisture of relative humidity. The pipeline network needs to be equipped with a moisture-exhausting device every 200-300 meters. The composite insulation structure using polyurethane foam insulation material as the outer insulation is relatively dense, so that the probability of entering the moisture of the insulation cavity layer is greatly reduced. If the selected insulation materials are all hydrophobic, the outer steel pipe and the inner working pipe The inter-water content will be extremely low, and only the position of the compensator should be set in the design process.
Polyurethane Stuffed Foam Insulation Material Used in Steam Pipeline Technical Advantage Polyurethane foam insulation material can be used to maintain the overall hydrophobicity of the steel pipe straight pipe section after the steel sleeve steel steam insulation pipe is insulated, and reduce the pipe network breaking rate. That is to reduce the number of drain pipes. At the same time, the thermal conductivity of polyurethane is low, the thermal insulation effect is good, the surface heat loss can be reduced, the thermal efficiency of pipeline transportation is improved, the specification of outer casing is reduced, and a series of subsequent engineering costs are reduced. At the same time, the temperature of the surface of the outer steel pipe is low, and the outer steel pipe is also extended. The service life of the surface coating.
In the steel sleeve steel steam insulation pipeline, the outer layer of the composite insulation structure is made of polyurethane varnish for heat preservation, the pipeline insulation effect is good, the pipeline heat loss is low, the outer casing specification is greatly reduced, the construction construction cost is reduced, the pipeline service life is long, and the conventional Steel sleeve steel steam insulation pipe has obvious advantages. The author hopes that by improving the requirements of the inner insulation materials, it can truly apply polyurethane foam insulation materials to the steam transportation field, and make outstanding contributions to the energy conservation and emission reduction of the thermoelectric industry through its good thermal insulation performance.
(Finish)
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