A method of exhausting salt for molten salt heat absorber

Abstract

The invention relates to an air exhausting and salt scattering method for a molten salt heat absorber. The heat absorber comprises N stages of heat absorber units, and the heat absorber units are provided with first ends and second ends. The method comprises the steps that when the heat absorber is started, molten salt enters the heat absorber, and air in the heat absorber is exhausted; salt scattering valves of all salt scattering branch pipes and exhaust valves of all exhaust branch pipes are opened, a part of molten salt enters an inlet pipe, the other part of molten salt enters the heat absorber units through the salt scattering branch pipes and second connecting pipes, a part of air is discharged through an outlet pipe, and the other part of air is discharged through first connectingpipes and the exhaust branch pipes; and after the air in the heat absorber is discharged, the salt scattering valves of all the salt scattering branch pipes and the exhaust valves of all the exhaust branch pipes are closed, the molten salt flows from the inlet pipe, and the molten salt sequentially passes through the heat absorber units at all stages through the first connecting pipes and the second connecting pipes, so that the molten salt flows out of the outlet pipe. The invention provides the high-efficiency air exhausting and salt scattering method.

Description

technical field [0001] The invention relates to the field of photothermal power generation, in particular to an exhaust salt repelling method for a molten salt heat absorber. Background technique [0002] The heat absorber is one of the core equipment of the tower solar power generation system. During the operation of the heat absorber, in order to ensure the smooth flow of the exhaust and salt-repelling pipeline, the current main method is to let the molten salt inside the heat absorber pass through the exhaust pipeline and the salt-repelling pipeline to realize the heating of the exhaust pipeline and the clean drainage pipeline. Ensure the reliable and uniform heating of the exhaust and clean pipelines, maintain the temperature of the pipelines higher than the freezing point of the molten salt, and avoid the blockage of the pipelines. Loss. [0003] The Chinese patent with the patent number CN104236142A discloses a method for antifreezing of the exhaust pipeline of a mol...

AI Technical Summary

Problems solved by technology

During the operation of the heat absorber, in order to ensure the smooth flow of the exhaust and salt-repelling pipeline, the current main method is to let the molten salt inside the heat absorber pass through the exhaust pipeline and the salt-repelling pipeline to realize the heating of the exhaust pipeline and the clean drainage pipeline. Ensure the reliable and uniform heating of the exhaust and clean pipelines, maintain the temperature of the pipelines higher than the freezing point of the molten salt, and avoid the blockage of the pipelines. Loss

[0003] The Chinese patent with the patent number CN104236142A discloses a method for antifreezing of the exhaust pipeline of a molten salt solar heat absorber. The connecting pipe on the top of the heat absorber is connected with an exhaust branch pipe with a throttling orifice. The branch pipes are combined to form the exhaust main pipe; part of the molten salt enters the heat absorber from the top connecting pipe, and the other part enters the exhaust branch pipe through the throttling orifice, and is collected in the exhaust main pipe and then discharged to maintain the temperature of the exhaust main pipe higher than the molten salt. Salt solidification point; the connecting pipe at the bottom of the heat absorber is connected with a discharge branch pipe with an electric gate valve, and the valve plate of the electric gate valve is provided with a throttling hole, and several discharge branch pipes are combined into a clean discharge main pipe; part of the molten salt enters from the bottom connection pipe The other part of the heat absorber enters the exhaust branch pipe through the orifice on the valve plate of the electric valve, and is collected to the main exhaust pipe before being discharged. This patent still cannot avoid the heat absorption caused by the diversion of the molten salt flow by the exhaust pipeline and the salt-repellent pipeline. loss of efficiency

[0004] Therefore, the prior art also lacks an exhaust salt repellent method efficiently used in molten salt heat absorbers

Images