System for preheating fused salt pipeline through nitrogen

Abstract

The invention relates to the technical field of heat energy utilization, and specifically relates to a system for preheating a fused salt pipeline through nitrogen. The system is characterized in that manual valves (13) are arranged on pipelines connected among a nitrogen superheater (3), a cold fused salt tank (4) and a hot fused salt tank (5); a centrifugal fan (6) is additionally arranged on a pipeline connected between the cold fused salt tank (4) and the hot fused salt tank (5); an outlet A (8) of the cold fused salt tank (4) is connected to one end of a fused salt pipeline (7); an outlet B (9) of the hot fused salt tank (5) is connected to the other end of the fused salt pipeline (7); at least three heat collecting racks (10) which are connected in series are arranged in parallel on the fused salt pipeline (7); the fused salt pipeline (7) is in an n shape in the heat collecting racks (10). According to the system, an electric tracing hot fused salt pipeline in the prior art is changed; the electricity energy is saved a lot; the carbon emission is reduced, and thus the environmental protection can be achieved.

Description

Technical field [0001] The invention relates to the technical field of heat energy utilization, in particular to a system for preheating molten salt pipelines with nitrogen. Background technique [0002] In the current photothermal industry, there are mainly two types of heat transfer and heat storage media: one is heat transfer oil and the other is molten salt. Due to the low boiling point of heat transfer oil, it severely limits the temperature of steam and limits the thermal efficiency of the cycle. Molten salt is used as the heat conduction and heat storage medium. Because the melting point of molten salt is relatively high, usually above 220°C, the pipe must be heated to above its melting point before the molten salt enters the molten salt pipeline. The commonly used method is to install electric heat tracing along the molten salt pipeline to heat the molten salt pipeline through electric energy. Therefore, it needs to consume huge electric energy during preheating, which c...

AI Technical Summary

Problems solved by technology

The commonly used method is to install electric heat tracing along the molten salt pipeline, and heat the molten salt pipeline with electric energy. Therefore, a huge amount of electric energy is consumed during preheating, which consumes a lot of capital and indirectly increases carbon emissions, which is not conducive to environmental development.

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