Shandong Huaning Electric Heating Technology Co., Ltd.
The important role of mineral insulated armored heating cables in molten salt energy storage systems
Pipes, valves and equipment must be pre-heated before the first start of the solar thermal power plant. After the power plant heat collection system is shut down on rainy days and nights, before re-starting, the electric heating system must be started to preheat in advance or during the shutdown process Always open the electric heating system to keep warm
May 23,2023
The salt fusion used in photothermal power plants is usually a binary salt that has a relatively high melting point, mostly around 230 °C. Technological pipelines, equipment, fittings, etc. D. Must be preheated to a temperature above the freezing point of the melt. Salts before they are combined with molten salt.
The preheating function mainly has two aspects: First, it can prevent molten salt from entering cold pipes, valves, tanks and other equipment, and then freeze and solidify, causing blockage or even damage to pipelines, valves, tanks and other equipment.; secondly, It can also prevent the expansion of valves. When the door and other equipment collide with hot molten salt, they will heat, expand and deform locally, causing damage to the equipment. Therefore, the pipes, fittings and equipment must be preheated before the commissioning of the solar thermal power plant. After the power plant's heat collection system is shut down on rainy days and nights before re-starting, it is necessary to start the electric heating system for pre-heating or after shutdown. During the process, an electric heating system was turned on to preserve heat.
If the electric heating system often fails or cannot continue to operate stably, it will seriously affect the normal operation of the solar thermal power plant. Given the important role of the electric heating system in a solar thermal power plant, at present, a reinforced heating cable with mineral insulation is the preferred heating element for an electric heating system in a solar thermal power plant. The advantages of the selection of mineral insulated armored heating cables are mainly reflected in the following aspects:
High temperature resistance
Mineral insulated reinforced heating cable heating core is a nickel-based alloy, the insulating layer is a high-purity magnesium oxide, And the outer shell is a seamless tube made of heat-resistant and corrosion-resistant alloy that is resistant to high temperatures. Which can work stably for a long time at a high temperature of 600 ° C. Meet the process temperature requirements for hot salt piping in solar thermal power plants;
Uniform heating
The heating wire core of mineral insulated reinforced heating cable is an electric heating element with consistent resistance, the temperature difference of the whole line is extremely small, no blind spots, And uniform installation will not lead to local heating temperature of the pipeline. Or the equipment is too high, resulting in pyrolysis of molten salt;
Uniform heating
The heating wire core of the mineral insulated reinforced heating cable is an electric heating element with consistent resistance, the temperature difference of the whole line is extremely small, there are no blind spots, and uniform installation will not lead to local heating temperature of the pipeline. Or the equipment is too high, which leads to pyrolysis of molten salt;
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