Molten salt heat storage single-tank internal arrangement heat exchange off-peak electricity steam boiler and heat exchange method

Abstract

The invention discloses a molten salt heat storage single-tank internal arrangement heat exchange off-peak electricity steam boiler and a heat exchange method. The electricity steam boiler comprises a molten salt tank, an electric heater and a steam generator; the electric heater is arranged in an electric heating area inside the molten salt tank, and the steam generator is arranged in a heat exchange area inside the molten salt tank; molten salt in the molten salt tank is heated by the electric heater in the electric heating area and then flows to the heat exchange area to achieve heat releasing; and the cooled molten salt circulates to the electric heating area through a molten salt conveying pipeline. The single-tank internal arrangement heat exchange scheme is adopted, the heated molten salt flows in the molten salt tank, heat exchange between the molten salt and a heat exchanger can be achieved in the molten salt tank, material cost is effectively saved, and molten salt solidification and pipeline blockage can be effectively prevented.

Description

technical field [0001] The invention relates to the field of electric steam boilers, in particular to a single-tank built-in heat exchange valley electric steam boiler for molten salt heat storage and a heat exchange method. Background technique [0002] At present, molten salt heat storage boilers are mainly used in solar thermal power generation. Existing solar thermal power generation heat storage and heat exchange generally adopt a double-tank external heat exchange scheme (ie, high-temperature tank, low-temperature tank, and heat exchanger). The scheme has the following problems and disadvantages when applied to medium and low temperature industrial boilers: both tanks need high temperature and corrosion resistant steel plate materials and good performance insulation materials, which are relatively expensive; the flow control of the molten salt pump requires precision; the heat exchanger And pipelines need good measures to prevent molten salt from solidifying and cloggi...

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Problems solved by technology

[0002] At present, molten salt heat storage boilers are mainly used in solar thermal power generation. Existing solar thermal power generation heat storage and heat exchange generally adopt a double-tank external heat exchange scheme (ie, high-temperature tank, low-temperature tank, and heat exchanger). The scheme has the following problems and disadvantages when applied to medium and low temperature industrial boilers: both tanks need high temperature and corrosion resistant steel plate materials and good performance insulation materials, which are relatively expensive; the flow control of the molten salt pump requires precision; the heat exchanger And pipelines need good measures to prevent molten salt from solidifying and clogging pipelines; valves and measuring instruments that are resistant to high temperature and corrosion are required

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