CN203479118U

CN203479118U - Molten salt energy-storage system capable of gravity flow-type salt evacuation

Info

Publication number: CN203479118U
Application number: CN201320530015.XU
Authority: CN
Inventors: 张智强; 寇建玉; 布仁; 王志勇
Original assignee: Inner Mongolia Electric Power Survey and Design Institute Co Ltd
Current assignee: Inner Mongolia Power Survey & Design Institute Co ltd
Priority date: 2013-08-28
Filing date: 2013-08-28
Publication date: 2014-03-12
Anticipated expiration: 2023-08-28

Abstract

The utility model discloses a molten salt energy-storage system capable of gravity flow-type salt evacuation. The molten salt energy-storage system comprises a high temperature molten salt pot, a low temperature molten salt pot, and multiple heat exchangers connected in series via a molten salt pipeline. The lowest points of the molten salt pipeline are higher than the molten salt liquid levels in the high temperature molten salt pot and the low temperature molten salt pot and are connected with the high temperature molten salt pot and the low temperature molten salt pot via salt evacuation pipelines. According to the utility model, no salt evacuation pot or salt evacuation pump is arranged and only gravity is used for realizing the salt evacuation function of the molten salt energy-storage system. Therefore, the dependence of a conventional salt evacuation system on the salt evacuation pot and salt evacuation pump is prevented; the function of evacuation of molten salt in the heat exchangers and molten salt pipeline can be realized in a very good manner in any case; the security of the large-scale molten salt energy-storage system is greatly improved; and at the same time, the system equipment configuration is simplified, the investment is reduced, and the operation cost is lowered.

Description

A kind of gravity flow is dredged the power generation molten salt energy storage system of salt

Technical field

The utility model relates to a kind of power generation molten salt energy storage system, particularly relates to the power generation molten salt energy storage system that a kind of gravity flow is dredged salt.

Background technology

Power generation molten salt energy storage system is generally formed, by pipeline, is formed an airtight system between each equipment by system equipments such as high/low temperature molten salt tank, high/low temperature molten salt pump, fused salt pipeline, heat exchangers.

Due to energy-accumulating medium---fused salt (regardless of composition) is being solid lower than under crystallization temperature condition, cannot flow.Only have by fused salt be heated to crystallization temperature just can make above its melt, covert for liquid.In other words, in the middle of power generation molten salt energy storage system, temperature of molten salt only, more than crystallization temperature, could utilize pump for liquid salts to carry, and makes it participate in heat accumulation and the exothermic process of power generation molten salt energy storage system.

What carry out during higher than thermic load when the energy of thermal source is heat accumulation process, this process is got low-temperature molten salt by low-temperature molten salt pump from low-temperature molten salt tank, absorb the heat transfer medium heat of thermal source in the middle of heat exchanger after, heat up, then deliver to high temperature melting salt cellar and realize thermal energy storage.

When what carry out during lower than thermic load without heat-source energy or heat-source energy, it is exothermic process, this process is got high-temperature molten salt by high-temperature melting salt pump from high temperature melting salt cellar, reverse flow in the middle of the same heat exchanger of mentioning in the middle of above-mentioned heat accumulation process, after the heat of high temperature lava is passed to heat transfer medium, lower the temperature, then deliver to low-temperature molten salt tank and realize heat energy release.

General power generation molten salt energy storage system is stage running system, rather than continuous operational system.Be to move in the middle of power generation molten salt energy storage system only has heat accumulation and exothermic process, other times system is shut down condition.Due to the crystallization property of fused salt, fused salt heat reservoir must be resolved the crystallization-preventive problem that seals fused salt in system under system quiescence or system failure state.After the fused salt of fused salt heat reservoir starts to put into operation, himself temperature just can not be again lower than crystallization temperature, otherwise will cause the fused salt cannot flow field problem.

The high/low temperature molten salt tank volume of large-scale fused salt heat reservoir is generally all more than several kilosteres, its storage tank outer surface radiation loss is little, high/low temperature molten salt storage tank average daily temperature reduces approximately 1 ℃ of left and right, and its storage tank outer surface radiation loss is not enough at the interval of rest of heat accumulation and heat release and in the troubleshooting stage, affects fused salt crystallisation problems in storage tank.Therefore, the fused salt crystallization-preventive problem of large-scale fused salt heat reservoir is mainly reflected in the less places of fused salt volume such as fused salt pipeline and heat exchanger.

The fused salt crystallization-preventive scheme of existing large-scale fused salt heat reservoir generally all adopts the thin salt system that arranges as shown in Figure 1.Owing to having fused salt pipeline minimum point 205 lower than the fused salt liquid level 206(heat accumulation pattern in high temperature melting salt cellar 201) or lower than the fused salt liquid level 206(Heat release mode in low-temperature molten salt tank 202), when fused salt heat reservoir is out of service or can only the fused salt in the middle of heat exchanger 204 and fused salt pipeline 203 is first unrestrained to dredging salt cellar 208 during heat exchanger 204 fault, then by dredging salt pipeline 207, deliver to high temperature melting salt cellar 201 or low-temperature molten salt tank 202 by after dredging salt pump 209 and boosting.

The fused salt crystallization-preventive scheme of existing large-scale fused salt heat reservoir exists dredges salt system complexity, whole thin salt system is high to the dependency degree of thin salt cellar 208, thin salt pump 209, once thin salt cellar 208, thin salt pump 209 break down and cannot realize thin salt functional, and then cause the fused salts in the middle of fused salt pipeline 203, heat exchanger 204 cannot be emptying, affect safety, the stable operation of whole fused salt heat reservoir.In addition, the fused salt crystallization-preventive scheme of existing large-scale fused salt heat reservoir is a many thin salt cellar 208, dredge salt pump 209, not only high the but also thin salt pump of equipment investment also can increase engineering self-operating power consumption.Cause salt melting system increase of investment, station service to increase.

Utility model content

The purpose of this utility model is to provide a kind of system simplification, small investment, operating cost low, a kind of novel molten salt system layout structure that security of system is high.

The purpose of this utility model is implemented by following technical scheme, a kind of gravity flow is dredged the power generation molten salt energy storage system of salt, it comprises high temperature melting salt cellar, low-temperature molten salt tank and several heat exchangers that are connected in series by fused salt pipeline, described in first, heat exchanger is connected by described fused salt pipeline with described high temperature melting salt cellar, described in last, heat exchanger is connected by described fused salt pipeline with described low-temperature molten salt tank, described fused salt pipeline minimum point is higher than the fused salt liquid level in described high temperature melting salt cellar and described low-temperature molten salt tank, described fused salt pipeline minimum point is connected with described low-temperature molten salt tank with described high temperature melting salt cellar respectively by dredging salt pipeline.

After fused salt heat reservoir is stopped transport, the fused salt in heat exchanger and fused salt pipeline, by self gravitation effect, flow back in high-temperature molten salt tank and low-temperature molten salt tank certainly, realizes the thin salt functional of heat exchanger and fused salt pipeline.

The utility model has the advantage of, the utility model does not arrange dredges salt cellar and thin salt pump, depend merely on gravity and realize the thin salt functional of power generation molten salt energy storage system, evaded existing thin salt system to dredging the dependence of salt cellar and thin salt pump, can realize well in any case the unrestrained function of fused salt in heat exchanger and fused salt pipeline, the security that has greatly improved large-scale fused salt heat reservoir.Simplify system equipment configuration simultaneously, reduced investment, reduced operating cost.

Accompanying drawing explanation

Fig. 1 is the front power generation molten salt energy storage system schematic diagram of transformation.

Fig. 2 is the power generation molten salt energy storage system schematic diagram that a kind of gravity flow of the utility model is dredged salt.

High temperature melting salt cellar 201, low-temperature molten salt tank 202, fused salt pipeline 203, heat exchanger 204, fused salt pipeline minimum point 205, fused salt liquid level 206, dredges salt pipeline 207, dredges salt cellar 208, dredges salt pump 209.

The specific embodiment: as shown in Figure 2, a kind of gravity flow is dredged the power generation molten salt energy storage system of salt, it comprises high temperature melting salt cellar 201, low-temperature molten salt tank 202 and several heat exchangers that are connected in series by fused salt pipeline 203 204, first heat exchanger 204 is connected by fused salt pipeline 203 with high temperature melting salt cellar 201, last heat exchanger 204 is connected by fused salt pipeline 203 with low-temperature molten salt tank 202, fused salt pipeline minimum point 205 is higher than the fused salt liquid level 206 in high temperature melting salt cellar 201 and low-temperature molten salt tank 202, fused salt pipeline minimum point 205 is connected with low-temperature molten salt tank 202 with high temperature melting salt cellar 201 respectively by dredging salt pipeline 207.

Claims

1. a gravity flow is dredged the power generation molten salt energy storage system of salt, it comprises high temperature melting salt cellar, low-temperature molten salt tank and several heat exchangers that are connected in series by fused salt pipeline, described in first, heat exchanger is connected by described fused salt pipeline with described high temperature melting salt cellar, described in last, heat exchanger is connected by described fused salt pipeline with described low-temperature molten salt tank, it is characterized in that, described fused salt pipeline minimum point is higher than the fused salt liquid level in described high temperature melting salt cellar and described low-temperature molten salt tank, described fused salt pipeline minimum point is connected with described low-temperature molten salt tank with described high temperature melting salt cellar respectively by dredging salt pipeline.