Application of Thermal Power Plants in Thermal Power Plants
The instrument's instrument tube has water as the medium. In order to prevent freezing in winter and block the pipeline, it needs to use electric heat tracing in the heat, and because the pipeline is rusted, high-pressure steam flushing and sewerage are required at regular intervals. The high-pressure steam reaches 400°C or 500°C. the above. At this time, the surface temperature of the instrument tube greatly exceeds the maximum temperature that can be tolerated by the heat belt. For this reason, the current common practice in the industry is to use a double-layer heat insulation structure to ensure the use of the heat strip.
Generally speaking, the inner insulation thickness of this structure is 10-30mm (depending on the surface temperature of the pipe and the temperature resistance level of the cable), aluminum sheath or aluminum tape is sheathed on the insulation layer and laid on it. Electric heat. Each mm insulation layer can reduce the temperature of the sweeper by about 10°C. When the line is swept, the cable should be turned off. The heat loss of the pipeline is still based on the conventional design (the thickness of the insulation layer can only be calculated according to the thickness of the outer layer). Such as: constant power heating cable CWH type, the maximum withstand temperature of 205 °C, and the sweep temperature reaches 400 °C, the inner insulation layer to be applied to the thickness of more than 20mm, to ensure that the tropical heat in the high temperature after the line can still be used normally.
Polyvinyl Chloride or PVC Resin SG3, SG5, SG7 and SG8 are homopolymers made by suspension polymerization. PVC resin is white powder form thermoplastic resin and has great versatility for making plastic products.
SG3 is for films, hoses, leathers, wire cables and other general purpose soft products.
SG5 is for pipes, fittings, panels, calendaring, injection, moulding, profiles, and sandals.
SG7 / SG8 is for bottles, sheets, calendaring, rigid injection and moulding pipes.
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