CN212030298U

CN212030298U - Single-tank phase change heat accumulator without stirrer

Info

Publication number: CN212030298U
Application number: CN202020607071.9U
Authority: CN
Inventors: 王峰; 张世广; 李进; 马瑞; 徐婷睿
Original assignee: Inner Mongolia University of Technology
Current assignee: Inner Mongolia University of Technology
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2020-11-27
Anticipated expiration: 2030-04-21

Abstract

The utility model discloses a single jar phase transition heat accumulator of no agitator, including storing up the salt jar and being located the phase change material who stores up the salt jar respectively, cylinder heat transfer coil and electric heater unit, cylinder heat transfer coil is coaxial with storing up the salt jar, the section of thick bamboo wall of cylinder heat transfer coil comprises spiral heat transfer coil, and cylinder heat transfer coil's axial mesopore is parallel with vertical direction, electric heater unit is located cylinder heat transfer coil's below and just to cylinder heat transfer coil's axial mesopore, phase change material fills the axial mesopore of cavity and cylinder heat transfer coil between storage salt jar inner wall and the cylinder heat transfer coil. The utility model discloses utilize cylindrical heat exchange coil's design, replace the phase change material pump, increase phase change material and get the reserves, improved the heat accumulation. Through electric heater unit and cylindrical heat exchange coil for it is fast to hold the exothermic speed, and energy storage density is high, and is small, and economic nature is good, whole energy memory simple structure, convenient to use, energy-concerving and environment-protective, green low carbon, and the application is extensive.

Description

Single-tank phase change heat accumulator without stirrer

Technical Field

The utility model relates to an energy storage technical field. In particular to a single-tank phase change heat accumulator without a stirrer.

Background

Energy is an important material basis for national economic growth and social development, and as the demand of human beings for energy is continuously increased, the problem of energy is more and more emphasized by people, but most of energy has the characteristics of discontinuity, instability and the like, so that the imbalance of a large amount of heat in time and space is caused, and on one hand, the energy is in shortage, on the other hand, the energy is wasted greatly, and a large amount of solar heat collection and industrial waste heat/waste heat resources are not reasonably utilized.

With increasing attention on energy conservation and emission reduction and environmental protection and development and progress of heat storage and energy storage technology, the enhancement of the efficient utilization of energy sources in a heat storage and energy storage mode is one of important directions of energy development in the future. Particularly, the appearance of haze promotes the process of developing renewable energy sources in China, and solar energy becomes the first choice for developing and utilizing the renewable energy sources by virtue of the advantages of solar energy. Phase-change material heat storage is a key link of solar high-temperature thermal power generation technology, and has been widely noticed by people in recent years, and the design of a heat storage tank is a more central problem in phase-change energy storage.

The design of the heat storage tank needs to take hold of two key points to strengthen the effect of the heat storage, one is to store phase-change materials as much as possible to increase the heat storage capacity; another important point is to enhance heat exchange to increase the heat exchange rate of the phase change material and the conduit.

The existing salt storage tank mostly causes forced convection through the stirrer to promote the heat exchange of the phase-change material and the heat exchange coil, however, the investment cost and the operation cost of the stirrer and the problems of occupying part of the volume and the like of the salt storage tank not only increase the resource investment but also reduce the storage capacity of the phase-change material in the phase-change material tank, and the heat storage capacity of the heat accumulator is influenced to a certain extent.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model aims to solve the technical problem that a single jar phase transition heat accumulator of agitator is provided to structural design is reasonable, convenient to use, and energy storage efficiency is high.

In order to solve the technical problem, the utility model provides a following technical scheme:

a single-tank phase-change heat accumulator without a stirrer comprises a salt storage tank, and a phase-change material, a cylindrical heat exchange coil and an electric heating device which are respectively positioned in the salt storage tank, wherein the cylindrical heat exchange coil is coaxial with the salt storage tank, the cylinder wall of the cylindrical heat exchange coil is composed of a spiral heat exchange coil, an axial middle hole of the cylindrical heat exchange coil is parallel to the vertical direction, the electric heating device is positioned below the cylindrical heat exchange coil and is just opposite to the axial middle hole of the cylindrical heat exchange coil, and the phase-change material is filled in a cavity between the inner wall of the salt storage tank and the cylindrical heat exchange coil and the axial middle hole of the cylindrical heat exchange coil.

In the single-tank phase change heat accumulator without the stirrer, the tank wall of the salt storage tank comprises an inner wall, an outer wall and a heat insulation layer positioned between the inner wall and the outer wall; one end of the cylindrical heat exchange coil, which is close to the electric heating device, is provided with a heat exchange coil inlet, and one end of the cylindrical heat exchange coil, which is far away from the electric heating device, is provided with a heat exchange coil outlet.

In the single-tank phase change heat accumulator without the stirrer, a top cover of the salt storage tank is respectively provided with a salt inlet, a safety valve, a pressure gauge and a thermometer; the salt inlet is communicated with the inner cavity of the salt storage tank.

Above-mentioned single jar phase transition heat accumulator of no agitator, be provided with out the salt mouth on the bottom lateral wall of salt storage tank, go out the salt mouth with the inside cavity of salt storage tank switches on.

According to the single-tank phase change heat accumulator without the stirrer, the heat insulation layer is a magnesium aluminum silicate heat insulation layer.

According to the single-tank phase change heat accumulator without the stirrer, the salt storage tank is cylindrical.

According to the single-tank phase change heat accumulator without the stirrer, the bottom and the periphery of the electric heating device are coated with the heat insulation material layers.

According to the single-tank phase change heat accumulator without the stirrer, the fins are mounted on the pipe body of the cylindrical heat exchange coil.

According to the single-tank phase change heat accumulator without the stirrer, the distance between the electric heating device and the axial middle hole of the cylindrical heat exchange coil is 15 cm.

In the single-tank phase change heat accumulator without the stirrer, the electric heating device is an immersion type electric heater.

The technical scheme of the utility model following profitable technological effect has been obtained:

think through the structure to the heat transfer coil pipe, design new-type heat transfer coil pipe, this design has increased working medium and phase change material's heat transfer area to increased the phase change material reserves with the volume heat accumulator, this heat accumulator can borrow the power that electric heater unit produced simultaneously, makes phase change material can be at phase change material jar internal circulation flow, has saved the input and the running cost of phase change material pump, has also increased phase change material's reserves simultaneously.

The novel cylindrical heat exchange coil is designed to replace a phase-change material pump, so that the storage capacity of the phase-change material is increased, and the heat storage capacity is improved. The phase-change latent heat of the phase-change material and the heat displayed by the phase-change material can be utilized to store heat, and the electric heating device and the cylindrical heat exchange coil pipe are utilized to realize high heat storage and release speed, high energy storage density, small volume and good economical efficiency.

Drawings

FIG. 1 is a schematic structural view of a single-tank phase change heat accumulator without a stirrer according to the present invention; the arrows in the figure indicate the direction of flow of the phase change material in the tank;

fig. 2 is a schematic view of the overlooking structure of the single-tank phase change heat accumulator without the stirrer.

The reference numbers in the figures denote: 1-a salt storage tank; 1-1-inner wall; 1-2-outer wall; 1-3-insulating layer; 1-4-salt inlet; 1-5-safety valve; 1-6-pressure gauge; 1-7-thermometer; 1-8-top cover; 1-9-a salt outlet; 2-cylindrical heat exchange coil; 2-1-heat exchange coil inlet; 2-2-outlet of heat exchange coil; 3-an electric heating device; 4-a phase change material; 5-a layer of insulating material.

Detailed Description

As shown in fig. 1, the single-tank phase-change heat accumulator without a stirrer in this embodiment includes a salt storage tank 1, and a phase-change material 4, a cylindrical heat exchange coil 2, and an electric heating device 3 that are respectively located in the salt storage tank 1, where the cylindrical heat exchange coil 2 is coaxial with the salt storage tank 1, a cylindrical wall of the cylindrical heat exchange coil 2 is formed by a spiral heat exchange coil, an axial middle hole of the cylindrical heat exchange coil 2 is parallel to a vertical direction, the electric heating device 3 is located below the cylindrical heat exchange coil 2 and faces the axial middle hole of the cylindrical heat exchange coil 2, and the phase-change material 4 fills a cavity between an inner wall of the salt storage tank 1 and the cylindrical heat exchange coil 2, and the axial middle hole of the cylindrical heat exchange coil 2. The bottom and the periphery of the electric heating device 3 are coated with heat insulation material layers 5. The salt storage tank 1 is cylindrical. The bottom and the periphery of the electric heating device 3 are coated with heat insulation material layers 5. The distance between the electric heating device 3 and the axial middle hole of the cylindrical heat exchange coil 2 is 15 cm. Fins are arranged on the tube body of the cylindrical heat exchange coil 2. The electric heating device 3 is an immersion electric heater.

The cylindrical partition plate is composed of the heat exchange coil pipe, fins are arranged inside and outside the partition plate, the partition plate is used for guiding and exchanging heat, the temperature difference of the phase-change material caused by a heat source is relied on, and then the density difference is caused, so that natural convection is generated, the stirrer cost is saved by replacing the stirrer, the phase-change material storage capacity is increased, and the heat exchange rate is increased by adopting a natural convection mode. The electric heating device 3 heats the cylindrical heat exchange coil 2 and the phase-change material 4 in the salt storage tank 1, and the phase-change material 4 is liquefied and then generates a buoyancy force along with the increase of temperature difference, so that the phase-change material 4 circularly flows in the salt storage tank 1.

The tank wall of the salt storage tank 1 comprises an inner wall 1-1, an outer wall 1-2 and a heat insulation layer 1-3 positioned between the inner wall 1-1 and the outer wall 1-2. The heat-insulating layer 1-3 is a magnesium aluminum silicate heat-insulating layer. The magnesium-aluminum silicate material can resist high temperature of more than 1000 ℃, has low thermal conductivity and excellent chemical stability and thermal stability, is widely applied to the occasions of wall linings of industrial furnaces, high-temperature pipelines, equipment and the like, and is an ideal high-temperature heat insulating material.

One end of the cylindrical heat exchange coil 2, which is close to the electric heating device 3, is provided with a heat exchange coil inlet 2-1, and one end of the cylindrical heat exchange coil 2, which is far away from the electric heating device 3, is provided with a heat exchange coil outlet 2-2. The heat transfer working medium in the cylindrical heat exchange coil 2 is injected or supplemented through a heat exchange coil inlet 2-1 on the side surface of the salt storage tank 1, and the heat exchange coil inlet 2-1 is sealed by a sealing cover.

A top cover 1-8 of the salt storage tank 1 is respectively provided with a salt inlet 1-4, a safety valve 1-5, a pressure gauge 1-6 and a thermometer 1-7; the salt inlets 1-4 are communicated with the inner cavity of the salt storage tank 1. The bottom side wall of the salt storage tank 1 is provided with salt outlets 1-9, and the salt outlets 1-9 are communicated with the inner cavity of the salt storage tank 1.

A safety valve 1-5, a pressure gauge 1-6 and a thermometer 1-7 are arranged on a top cover 1-8 of the salt storage tank 1 to obtain data of the phase-change material 4, and the safe operation of the salt storage tank 1 is ensured. The safety valve 1-5 has the following functions: when the phase-change material 4 rises to the top of the salt storage tank 1, the trigger limiting device fails or the valve on the bottom electric heating device 3 is closed through the linkage device to fail, the buoyancy safety valve 1-5 is opened along with the increase of the internal pressure, and the operation safety of the salt storage tank 1 is ensured by releasing partial gas in the pipe to reduce the pressure. The salt inlets 1-4 are used for safely and efficiently putting the phase-change material 4.

In practical application, the single-tank phase change heat accumulator without the stirrer can realize the following functions:

a heat storage process: filling a phase-change material 4 into a salt storage tank 1 through a salt inlet 1-4 before starting, starting a bottom electric heating device 3 to electrically heat the phase-change material 4 to a liquid state, and inserting a pressure gauge 1-6 and a thermometer 1-7 into a top cover 1-8 of the salt storage tank 1 from an opening. Although the forced convection heat exchange of the stirrer is not carried out in the process, the natural convection heat exchange generated by the heat source and the flow guide area generated by the cylindrical heat exchange coil 2 can have good effects.

An exothermic process: the heat exchange working medium enters the cylindrical heat exchange coil 2 through the heat exchange coil inlet 2-1, the heat exchange working medium fluid is controlled to flow in the cylindrical heat exchange coil 2, the energy stored by the phase-change material 4 is absorbed, the fins can strengthen heat exchange, and the working medium fluid after heat exchange flows out from the heat exchange coil outlet 2-2 to realize heat release.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.

Claims

1. A single-tank phase-change heat accumulator without a stirrer is characterized by comprising a salt storage tank (1), and a phase-change material (4), a cylindrical heat exchange coil (2) and an electric heating device (3) which are respectively positioned in the salt storage tank (1), the cylindrical heat exchange coil (2) is coaxial with the salt storage tank (1), the wall of the cylindrical heat exchange coil (2) is formed by a spiral heat exchange coil, and the axial middle hole of the cylindrical heat exchange coil (2) is parallel to the vertical direction, the electric heating device (3) is positioned below the cylindrical heat exchange coil (2) and is opposite to the axial middle hole of the cylindrical heat exchange coil (2), the phase-change material (4) is filled in a cavity between the inner wall of the salt storage tank (1) and the cylindrical heat exchange coil (2) and an axial middle hole of the cylindrical heat exchange coil (2).

2. The agitator-less single-tank phase-change heat accumulator according to claim 1, characterized in that the tank walls of the salt storage tank (1) comprise an inner wall (1-1), an outer wall (1-2) and an insulation layer (1-3) between the inner wall (1-1) and the outer wall (1-2); one end of the cylindrical heat exchange coil (2) close to the electric heating device (3) is provided with a heat exchange coil inlet (2-1), and one end of the cylindrical heat exchange coil (2) far away from the electric heating device (3) is provided with a heat exchange coil outlet (2-2).

3. The single-tank phase change heat accumulator without stirrer according to claim 1, characterized in that the top cover (1-8) of the salt storage tank (1) is respectively provided with a salt inlet (1-4), a safety valve (1-5), a pressure gauge (1-6) and a thermometer (1-7); the salt inlet (1-4) is communicated with the inner cavity of the salt storage tank (1).

4. The single-tank phase-change heat accumulator without stirrer according to claim 1, characterized in that the side wall of the bottom of the salt storage tank (1) is provided with salt outlets (1-9), and the salt outlets (1-9) are communicated with the inner cavity of the salt storage tank (1).

5. The stirrerless single-pot phase change heat accumulator according to claim 2, characterized in that said insulation (1-3) is an aluminium magnesium silicate insulation.

6. The stirrerless single-tank phase change regenerator according to any one of claims 1 to 5, characterized in that the salt storage tank (1) is cylindrical.

7. The stirrerless single-pot phase change heat accumulator according to any of claims 1 to 5, characterized in that the bottom and the periphery of said electric heating means (3) are coated with a layer (5) of insulating material.

8. The single-tank phase-change heat accumulator without stirrer according to any of claims 1-5, characterized in that the tubular body of the cylindrical heat exchange coil (2) is provided with fins.

9. Single-tank phase-change heat accumulator without stirrer according to any of claims 1-5 characterized by the fact that the distance between the electric heating means (3) and the axial median hole of the cylindrical heat exchange coil (2) is 15 cm.

10. Agitatorless single-tank phase-change heat accumulator according to any of claims 1 to 5, characterized in that the electric heating means (3) are electric immersion heaters.