Pre-heating and heating device of high-temperature molten salt storage tank

Abstract

The invention discloses a pre-heating and heating device of a high-temperature molten salt storage tank. The pre-heating and heating device comprises a tank wall electric heat tracing, a tank bottom electric heat tracing, an air gathering pipe, a circulating fan, an air door regulator, a fixed type spiral nozzle, a rotation type nozzle and an air channel, and the pre-heating and heating device combines tank body pre-heating and a storage medium together. The electric heat tracings are arranged at the tank bottom and the tank wall, the electric heat tracings heat the tank body metal and conducts heat preservation in the pre-heating process of the tank body, the temperature of the tank wall is cooled and balanced through a closed type circulating air system, meanwhile, the circulating air isheated, and the circulating hot air reheats the tank top and the tank bottom. The electric heat tracings heat molten salt to maintain the temperature of the medium in the long-time break down. The pre-heating and heating device avoids that a conventional electric heating bar sleeve pipe conducts trepanning at the bottom of the tank wall, so that the risk that the storage tank leaks is reduced. Meanwhile, a high-power air heater does not need to be configured. The pre-heating efficiency and the operation reliability of the storage tank are improved.

Description

technical field [0001] The invention belongs to the technical field of solar thermal power generation and other high-temperature energy storage and heat storage utilization, and particularly relates to a preheating and heating device for a high-temperature molten salt storage tank. Background technique [0002] At present, high-temperature energy storage heat storage technology is widely used in solar thermal, conventional power stations and other new energy fields, and the heat storage medium is generally molten salt. Tower-type and trough-type photothermal power stations with heat storage store part of the heat through molten salt or other media while generating electricity during the day, and convert the stored heat into steam at night to drive steam turbines to generate electricity, with long power generation time and more stable power output. Conventional power plants use electric energy or high-temperature flue gas to heat the storage medium, and then convert steam to ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the connection pipe needs to be welded at the bottom of the tank wall, and the stress at the bottom of the tank wall of a large-capacity high-temperature storage tank is large, and the welding seam position of the connection pipe is prone to leakage

Once the storage tank leaks, the entire repair cost and loss caused by outage are huge

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