CN-122015546-A - Compact molten salt heat exchange and molten salt phase state detection device

CN122015546ACN 122015546 ACN122015546 ACN 122015546ACN-122015546-A

Abstract

The invention discloses a compact molten salt heat exchange and molten salt phase state detection device which comprises a box-type device shell, wherein a separation layer is arranged in the shell and is divided into a plurality of chambers, phase change materials with different phase change temperatures are filled in the chambers, finned tubes are arranged in the chambers and comprise heat exchange medium pipelines and fins positioned on the outer sides of the pipelines, the finned tubes in the chambers are connected in series, heat exchange medium entering the chambers flows from bottom to top in the heat exchange medium pipelines, a phase state monitoring assembly is arranged in the chambers and comprises an ultrasonic wave transmitting device and an ultrasonic wave receiving device which are respectively arranged on the upper wall surface and the lower wall surface of the chambers, and the phase state in the chambers is monitored in real time in a sound wave monitoring mode. The container type molten salt heat exchange device is used for optimizing space, modularization can be realized, and the expansion of a runner and the improvement of the total heat storage capacity of a heat storage system are facilitated.

Inventors

LIU FUQING
ZHOU HAO
HE YIFENG
CHEN YUANSUO
ZHU YUN
JI MENGTING
LI JUNCHENG
ZHENG TIANYAN
YI ZHIBO

Assignees

国能浙江余姚燃气发电有限责任公司
浙江大学

Dates

Publication Date: 20260512
Application Date: 20251215

Claims (10)

1. The compact molten salt heat exchange and molten salt phase detection device is characterized by comprising a box-type device shell, wherein the shell is divided into a plurality of chambers by a separation layer, and each chamber is filled with phase change materials with different phase change temperatures; The finned tubes in each cavity are connected in series, and the heat exchange medium entering each cavity flows from bottom to top in the heat exchange medium pipeline; the phase state monitoring assembly is arranged in the cavity and comprises an ultrasonic wave transmitting device and an ultrasonic wave receiving device which are respectively arranged on the upper wall surface and the lower wall surface of each cavity, and the phase state in the cavity is monitored in real time in a sound wave monitoring mode.
2. The compact molten salt heat exchange and molten salt phase detection device according to claim 1, wherein a medium inlet and a medium outlet are formed in the top of the device shell, the finned tubes in the cavities are simultaneously communicated with the medium inlet and the medium outlet, and a heat exchange medium enters through the medium inlet, sequentially flows through each cavity and flows out of the medium outlet.
3. The compact molten salt heat exchange and molten salt phase detection device of claim 2 wherein a vertical draft tube is disposed in each chamber and is in communication with the heat exchange medium conduit for directing the heat exchange medium to flow from bottom to top along the heat exchange medium conduit into the bottom of the chamber.
4. The compact molten salt heat exchange and molten salt phase detection device according to claim 1, wherein the device housing is of a rectangular box-type structure, and the outside is made of heat insulation materials.
5. The compact molten salt heat exchange and molten salt phase detection device according to claim 4, wherein the heat exchange medium pipeline is a coil pipe which is arranged in a bending mode, fins are uniformly welded on the outer side of the pipeline, the thickness of each fin is 1.5mm, the screw pitch is 15mm, and the width of each fin is 10mm.
6. The compact molten salt heat exchange and molten salt phase detection device of claim 1 wherein the heat exchange medium conduit is maintained sealed through the separation layer such that each chamber forms an independent sealed space.
7. A compact molten salt heat exchange and molten salt phase detection device as claimed in claim 1 wherein the phase monitoring assembly is arranged in the chamber in which heat exchange is worst or in each chamber, the generated waves in different chambers being at different frequencies respectively.
8. The compact molten salt heat exchange and molten salt phase detection device of claim 1 wherein a metal foam is also disposed within the chamber and is combined with the phase change material to enhance heat exchange or nanoparticles are added to the phase change material to enhance heat exchange.
9. The compact molten salt heat exchange and molten salt phase detection device of claim 1 including a plurality of separate box-type device housings connected to the same flow splitting device through which the heat exchange medium is equally distributed into each box device.
10. The compact molten salt heat exchange and molten salt phase detection device according to claim 9, wherein an electromagnetic valve is installed at a medium inlet of a device shell, and a thermocouple for detecting the temperature of fluid is arranged in a pipeline of a medium outlet.

Description

Compact molten salt heat exchange and molten salt phase state detection device Technical Field The invention belongs to the technical field of peak regulation of molten salt systems, and particularly relates to a compact type molten salt heat exchange and molten salt phase state detection device. Background At present, research on a molten salt heat storage device mainly focuses on how to enhance heat exchange and how to accurately control and monitor. However, the prior art only considers the efficiency problem, does not have essential optimization for the total heat exchange amount, and also needs to customize a box body with specific power and storage capacity when the use place of the device changes, and the control and monitoring ideas mainly depend on the change of the liquid level to generate the conversion of an electric signal, which only reflects the overall state of the salt tank and has poor effect on the melting state of each position inside. The prior patent (CN 118623679A) discloses a composite high-heat-conductivity molten salt device, which relates to the technical field of heat exchangers, a plurality of heat-conducting material pieces are respectively arranged in parallel and at intervals along the length direction of the heat-conducting material pieces, the heat conductivity coefficient of the heat-conducting material pieces is more than 50W/(m.K), and a through fluid channel is arranged in the heat-conducting material pieces along the length direction of the heat-conducting material pieces and is used for introducing fluid to store heat or release heat for the heat-conducting material pieces. The invention discloses a molten salt heat exchange/heat storage equipment performance test device which comprises a high-temperature molten salt circulation loop and a cascade cooling system (a heat conduction oil circulation loop and a cooling water circulation loop), wherein the flow of working media is guaranteed to be accurately regulated in a large range in a combined regulation mode of a variable frequency pump, a valve and a bypass pipeline, a plurality of groups of electric heaters are arranged, heating power and temperature can be accurately regulated in a large range in a mode of automatically regulating power by using silicon controlled rectifiers, and the service lives of molten salt and heat conduction oil can be greatly prolonged by introducing nitrogen to isolate the molten salt and the heat conduction oil from contacting with air. The comprehensive test platform for testing the heat exchange or heat storage performance of the molten salt has the characteristics of multiple functions, is suitable for testing the flow, heat exchange and heat storage performance of the molten salt working medium, and can be popularized to other liquid working mediums. In addition, in the prior invention patent, the idea about control and monitoring mainly depends on the change of liquid level to generate the conversion of electric signals, which only reflects the overall state of the salt tank and has poor effect on the melting state of each position inside. At present, research on a molten salt heat storage device mainly focuses on how to enhance heat exchange and how to accurately control and monitor. The prior art can only play a role in macroscopic control and adjustment, or the suitability of equipment is poor, and modularization and batch production cannot be realized. Disclosure of Invention The invention mainly aims at the problems, and provides the compact molten salt heat exchange and molten salt phase state detection device which uses the container type molten salt heat exchange device to optimize the space, and meanwhile, the container type molten salt heat exchange device can realize modularization, and the size and the capacity of each container are consistent, so that the expansion of a flow passage and the improvement of the total heat storage capacity of a heat storage system are facilitated. The specific technical scheme of the invention is as follows: A compact molten salt heat exchange and molten salt phase detection device comprises a box-type device shell, wherein the device shell is divided into a plurality of chambers by separation layers, and each chamber is filled with phase change materials with different phase change temperatures; The finned tubes in each cavity are connected in series, and the heat exchange medium entering each cavity flows from bottom to top in the heat exchange medium pipeline; the phase state monitoring assembly is arranged in the cavity and comprises an ultrasonic wave transmitting device and an ultrasonic wave receiving device which are respectively arranged on the upper wall surface and the lower wall surface of each cavity, and the phase state in the cavity is monitored in real time in a sound wave monitoring mode. Preferably, the top of the device shell is provided with a medium inlet and a medium outlet, the finned tubes in each cavity are simulta