CN105890413B - A kind of three-dimensional pulsating heat pipe phase-change material coupled tank system - Google Patents

Abstract

The invention discloses a three-dimensional pulsating heat pipe phase-change material coupled energy storage system, the structure of which includes several energy storage sub-modules, pulsating heat pipes, fins, energy storage boxes, phase-change materials, heat release runners, heat charging runners, and sealing pads piece. The upper, middle and lower parts of the pulsating heat pipe are respectively covered with fins, and the fins are respectively placed in the heat releasing flow channel, the energy storage box and the heat charging flow channel, and the phase change material is filled in the energy storage box. The invention rationally combines the advantages of high thermal conductivity, flexible structure and low cost of the pulsating heat pipe with the advantages of high latent heat of phase change materials, the structure is simple and compact, the system shape can be flexibly changed according to the actual structure, and multiple sub-modules can be connected Form a large energy storage system. Several energy storage sub-modules of the present invention are suitable for recovery and utilization of various industrial waste heat after proper combination and design, and have broad market prospects and environmental protection value.

Description

A three-dimensional pulsating heat pipe phase change material coupled energy storage system

technical field

The invention belongs to the field of industrial waste heat utilization and thermal energy storage, and in particular relates to a three-dimensional pulsating heat pipe phase change material coupled energy storage system.

Background technique

With the development of the global economy and society, energy consumption and environmental pollution have become major problems, and energy conservation and emission reduction have become increasingly urgent. my country's industrial energy consumption accounts for about 70% of the total energy consumption in the country, and the energy consumption is relatively large. Among them, the utilization rate of industrial waste heat is low, and the energy is not fully utilized. The energy consumed is exhausted in various forms of waste heat. Therefore, my country is rich in waste heat resources, and waste heat recovery and utilization can further improve energy utilization efficiency, thereby reducing the use of fossil fuels and reducing pollutant emissions.

In recent years, the recovery and utilization of industrial waste heat has attracted the attention of the national government and many scientific research institutes and enterprises. At present, industrial waste heat utilization technologies mainly include heat exchange technology, heat power conversion technology, and refrigeration and heating technology. Regenerative heat exchanger is a kind of heat exchange technology. The main principle is that cold and hot fluid alternately flow through the heat storage element for heat exchange. Phase change materials have great potential in thermal energy storage and utilization. The pulsating heat pipe can not only make up for the low thermal conductivity of phase change materials with its advantages, but also connect phase change materials with hot and cold fluids as a good heat transfer medium.

Contents of the invention

Purpose of the invention: In order to solve the deficiencies in the prior art, the present invention provides a three-dimensional pulsating heat pipe phase change material coupling energy storage system, which has the advantages of large heat storage, fast heat storage and release, simple and compact structure, convenient assembly, and high safety , easy maintenance, long service life and other advantages. The energy storage system can be used as a fixed energy storage system or as a mobile energy storage system. The heat storage process and heat release process can be carried out simultaneously or separately, which can solve the time and space mismatch between heat storage and heat release. The problem.

Technical solution: a three-dimensional pulsating heat pipe phase change material coupled energy storage system, including more than two energy storage sub-modules, the energy storage sub-modules include heat release flow channels, energy storage boxes, heat charging flow channels, and pulsating heat pipes; The heat release flow channel is connected to one end of the energy storage box, while the other end of the energy storage box is connected to the heat charging flow channel; the pulsating heat pipe is provided with upper fins, middle fins and lower fins in sequence from top to bottom , and the upper fins are placed in the heat release flow channel, the middle fins are placed in the energy storage box, and the lower fins are placed in the heat charging flow channel; the energy storage box and the middle fin are filled with phase change Materials; the upper ends of the adjacent energy storage sub-modules are connected to each other through heat release runners, and the lower ends are connected to each other through heat charging runners.

Preferably, a first sealing gasket is arranged between the interconnected heat releasing runners; a second sealing gasket is arranged between the interconnected heating runners.

Preferably, both the first sealing gasket and the second sealing gasket are made of polytetrafluoroethylene or polyethylene corrosion-resistant materials; the working fluid of the pulsating heat pipe is micro-nanocapsule phase-change material emulsion or nanofluid; the The phase change material is a composite phase change material of expanded graphite material and common organic phase change material or a microcapsule phase change material.

Preferably, the middle fin is provided with more than one hole.

Preferably, adjacent upper fins are staggered; and adjacent lower fins are staggered.

Preferably, the energy storage box is a sandwich structure, and the middle of the sandwich is evacuated, or the middle of the sandwich is filled with thermal insulation materials, or the middle of the sandwich is filled with phase-change materials.

Preferably, the end of the pulsating heat pipe is provided with a liquid injection port, and the liquid injection port is exposed outside the heat releasing runner or outside the heating runner.

Preferably, both the heat release runner and the heat charging runner are tapered structures, and the runners gradually narrow along the flow direction of the working medium.

Preferably, the starting temperature of the pulsating heat pipe is lower than the phase change temperature of the phase change material.

Beneficial effects: the invention provides a three-dimensional pulsating heat pipe phase change material coupled energy storage system, which reasonably combines the advantages of high thermal conductivity, flexible structure, and low cost of the pulsating heat pipe with the advantages of high latent heat of the phase change material, and the pulsating As a bridge connecting the waste heat source, heat storage medium and users, the heat pipe plays the role of efficient heat transfer; the energy storage sub-module has a compact and simple structure, and a single energy storage sub-module is easy to repair and replace; the staggered arrangement and The fins with several small holes can greatly improve the heat storage and heat release efficiency, and the geometric structure and installation method of the three-dimensional pulsating heat pipe can be adjusted according to the actual application; the energy storage box is specially designed for heat preservation, which can greatly reduce heat loss.

In the present invention, the energy storage sub-module itself has excellent heat storage and heat release capabilities. For different heat storage temperature ranges, the type of phase change material, the type of pulsating heat pipe working fluid, and the type of wall material of the pulsating heat pipe can meet the requirements. The energy storage The large-scale energy storage system composed of sub-modules only needs a simple structural design to meet the requirements of different heat storage scales, and has broad market prospects and environmental protection value.

Description of drawings

1 is a schematic diagram of a three-dimensional pulsating heat pipe/phase change material coupled energy storage system of the present invention;

Fig. 2 is a schematic structural diagram of a single energy storage sub-module;

Fig. 3a is a front view of a single energy storage sub-module, Fig. 3b is a side view of a single energy storage sub-module, and Fig. 3c is a top view of a single energy storage sub-module;

Fig. 4a is an A-A sectional view of a single energy storage sub-module in Fig. 3a, and Fig. 4b is a B-B sectional view of a single energy storage sub-module in Fig. 3a;

Fig. 5a is an isometric view of the pulsating heat pipe of the three-dimensional pulsating heat pipe, Fig. 5b is a front view of the pulsating heat pipe of the three-dimensional pulsating heat pipe, and Fig. 5c is a partial enlarged view of part A in Fig. 5b.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in the drawings, a three-dimensional pulsating heat pipe phase change material coupling energy storage system includes more than two energy storage sub-modules 1, and the energy storage sub-module 1 includes a heat release flow channel 2, an energy storage box 3, and a heat charging flow channel 4. The pulsating heat pipe 5; the heat releasing runner 2 is welded together with one end of the energy storage box 3, and the other end of the energy storage box 3 is welded together with the heat charging runner 4, or connected by other sealed connection methods. Together; the pulsating heat pipe 5 is provided with upper fins 51, middle fins 52 and lower fins 53 in sequence from top to bottom, and the upper fins 51 are placed in the heat release runner 2, and the middle fins 52 are placed in the energy storage box body 3, and the lower fin 53 is placed in the heat-charging runner 4; the phase-change material 6 is filled between the energy storage box 3 and the middle fin 52; The channels 2 are connected to each other, and the lower ends are connected to each other through the hot runner 4 .

A first sealing gasket 21 is arranged between the interconnected heat releasing runners 2; a second sealing gasket 41 is arranged between the interconnected heating runners 4; Fluid leak.

The shape and structure of the fins are rich and varied, and materials such as high thermal conductivity stainless steel, copper, and aluminum alloy can be used.

The first sealing gasket 21 and the second sealing gasket 41 all adopt polytetrafluoroethylene or polyethylene corrosion-resistant material; A mixture of various substances, such as water/ethylene glycol solution, etc., can be a micro-nanocapsule phase-change material emulsion or a nanofluid. The pulsating heat pipe 5 is a three-dimensional pulsating heat pipe, and its pipe material can be copper, stainless steel, other metals, alloys, etc. Its geometric shape and installation method can be changed according to actual conditions, and it has good plasticity and adaptability. The phase change material 6 can adopt organic phase change materials, such as paraffin, fatty acid, etc., can be inorganic phase change materials, such as molten salt phase change materials, etc., can be materials with high thermal conductivity such as expanded graphite and common organic phase change materials. Phase change materials or microcapsule phase change materials, etc.

The middle fin 52 is provided with more than one small hole. It can increase the filling amount of the phase change material and improve the heat storage capacity without affecting the heat exchange efficiency between the phase change material and the pulsating heat pipe.

A staggered arrangement is made between adjacent upper fins 51 ; and a staggered arrangement is made between adjacent lower fins 53 . It is used to destroy the flow boundary layer, as shown in the enlarged view in Fig. 5c, thereby improving the heat transfer performance.

The energy storage box 3 has a sandwich structure, and the middle of the sandwich is evacuated, or the middle of the sandwich is filled with thermal insulation materials, or the middle of the sandwich is filled with phase-change materials.

The pulsating heat pipe 5 is provided with a liquid injection port 511 , and the liquid injection port 511 is exposed outside the heat releasing runner 2 or outside the heat charging runner 4 . It is convenient to replace the internal working medium of the pulsating heat pipe.

Both the heat release runner 2 and the heat charging runner 4 are tapered structures, and the runners gradually narrow along the flow direction of the working medium. It is used to improve the consistency of heat exchange capacity of different parts inside the flow channel.

The starting temperature of the pulsating heat pipe 5 is lower than the phase change temperature of the phase change material.

The arrangement position of the heat releasing runner 2 or the heat charging runner 4 can be interchanged, or can be used as the heat releasing runner and the heating runner at the same time according to the actual situation.

The energy storage system uses pulsating heat pipes as the heat transfer medium, and does not need to transfer heat through other flowing media, saving pump consumption.

The energy storage system can be used as both a fixed energy storage system and a mobile energy storage system. The heat storage process and heat release process of the energy storage system can be carried out simultaneously or separately. Solve the time and space mismatch of heat storage and release.

The invention rationally combines the advantages of high thermal conductivity, flexible structure, and low cost of the pulsating heat pipe with the advantages of high latent heat of the phase change material. The high-temperature fluid passes through the downflow channel and exchanges heat with the evaporating section covered with fins on the pulsating heat pipe. , the heat is transported by the pulsating heat pipe to the energy storage box area in the middle, and the fins in the middle of the pulsating heat pipe quickly transfer the heat to the phase change material. The phase change material stores heat through latent heat or sensible heat, and the stored heat passes through the pulsating heat pipe Transported to the upper part, the heat is quickly released to the heat exchange medium through the upper fins. The designed energy storage sub-module has a compact and simple structure, the system shape can be flexibly changed according to the actual structure, and multiple sub-modules can be connected to form a large energy storage system. After the several energy storage sub-modules of the present invention are properly combined and designed, they are suitable for recovery and utilization of various industrial waste heat, and have broad market prospects and environmental protection value.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (6)

1. A three-dimensional pulsating heat pipe phase change material coupled energy storage system, characterized in that it includes more than two energy storage sub-modules (1), and the energy storage sub-module (1) includes heat release channels (2), storage Energy box (3), heat charging runner (4), three-dimensional pulsating heat pipe (5); the heat release runner (2) is connected to one end of the energy storage box (3), and the energy storage box (3) The other end is connected to the heat-charging runner (4); the three-dimensional pulsating heat pipe (5) is provided with upper fins (51), middle fins (52) and lower fins (53) sequentially from top to bottom, and the The above-mentioned upper fins (51) are placed in the heat release runner (2), the middle fins (52) are placed in the energy storage box (3), and the lower fins (53) are placed in the heat charging runner (4) ; The phase change material (6) is filled between the energy storage box (3) and the middle fin (52); the upper ends of adjacent energy storage sub-modules (1) are connected to each other through heat release runners (2) , the lower ends are connected to each other through the hot runner (4); The middle fin (52) has more than one hole; The upper fins (51) are in multiple rows, and the adjacent upper fin rows are staggered; the lower fins (53) are in multiple rows, and the adjacent lower fin rows are staggered; The heat release runner (2) and the heat charging runner (4) are all tapered structures, and along the flow direction of the working fluid, the runners gradually narrow. 2. The three-dimensional pulsating heat pipe phase change material coupling energy storage system according to claim 1, characterized in that: a first sealing gasket (21) is arranged between the interconnected heat release channels (2); A second sealing gasket (41) is arranged between the channels (4). 3. The three-dimensional pulsation heat pipe phase change material coupling energy storage system according to claim 2, characterized in that: the first sealing gasket (21) and the second sealing gasket (41) are both made of polytetrafluoroethylene or polytetrafluoroethylene Ethylene corrosion-resistant material; the working fluid of the three-dimensional pulsating heat pipe (5) is a micro-nanocapsule phase-change material emulsion or nanofluid; the phase-change material (6) is a phase-change composite of expanded graphite material and ordinary organic phase-change material materials or microencapsulated phase change materials. 4. The three-dimensional pulsating heat pipe phase change material coupling energy storage system according to claim 1, characterized in that: the energy storage box (3) is a sandwich structure, the middle of the sandwich is vacuumed, or the middle of the sandwich is filled with insulation materials, or the sandwich The middle is filled with phase change material. 5. The three-dimensional pulsating heat pipe phase change material coupled energy storage system according to claim 1, characterized in that: the end of the three-dimensional pulsating heat pipe (5) is provided with a liquid injection port (511), and the liquid injection port ( 511) are exposed outside the heat releasing runner (2) or outside the heating runner (4). 6. The three-dimensional pulsating heat pipe phase change material coupled energy storage system according to claim 1, characterized in that: the start-up temperature of the three-dimensional pulsating heat pipe (5) is lower than the phase change temperature of the phase change material.