CN205156393U - Fused salt heat absorber - Google Patents

Abstract

The utility model relates to a molten salt heat absorber, which comprises a heat absorber shell, a heat absorber tube assembly and a heat absorber tube holder for fixing the heat absorber tube assembly are arranged in the shell; the heat absorber tube assembly is composed of a plurality of The assembly weldment composed of heat-absorbing pipe, upper header, lower header, salt outlet pipe section, salt inlet pipe section and support frame; the middle straight sections of multiple heat-absorbing pipes are arranged side by side to form the heat-absorbing surface; the heat-absorbing surface is fixed on The heat-absorbing pipe is mounted on the holder; the salt outlet pipe section is arranged at one end of the upper header; the salt inlet pipe section is arranged at one end of the lower header; the support frames are respectively arranged in the middle of the upper header and the lower header. The utility model improves the heat-absorbing efficiency of sunlight on the surface of the heat-absorbing pipe; solves the problem of freezing of molten salt inside the heat-absorbing pipe at low temperature; The problem of excessive internal temperature difference; not only the structure is simple, the cost advantage is obvious, but also it is especially suitable for the field of high-temperature heat utilization of solar energy, which broadens the application of solar energy.

Description

molten salt heat sink

technical field

The utility model relates to the technical field of mid-high temperature heat utilization of solar energy, in particular to a small solar molten salt heat collector.

Background technique

Molten salt heat absorbers have been used in solar heat collection and conversion systems, mainly in tower solar thermal power plants.

In the tower solar thermal power generation system, the heliostats in the mirror field reflect the sunlight to the central heat absorber on the top of the receiving tower in the center of the mirror field, and the central heat absorber is covered by the heliostat The reflected sunlight is heated, so the received sunlight energy is converted into heat energy and transmitted to the heat transfer and heat storage working medium, which is typically molten salt (a mixture of liquid sodium nitrate and potassium nitrate) . The hot molten salt after absorbing heat is stored in the molten salt storage tank, which is used to heat the steam required by the steam turbine in the power generation system.

The current high-temperature molten salt heat absorber is used in large-scale tower-type solar thermal power stations, and its structure is complex and expensive; it is difficult to apply it to the field of medium-high temperature heat utilization of distributed solar energy with broader application prospects.

Utility model content

The technical problem to be solved by the utility model is to provide a molten salt heat absorber, which is intended to be used in the field of high-temperature heat utilization in distributed solar energy.

The technical solution adopted by the utility model to solve the technical problem is: a molten salt heat absorber, which includes a heat absorber shell, and the heat absorber tube assembly and the heat absorbing tube assembly for fixing the heat absorber tube assembly are arranged in the shell. Tube holder; the heat absorber tube assembly is a weldment consisting of multiple heat absorbing tubes, upper headers, lower headers, salt outlet pipe sections, salt inlet pipe sections, and support frames; the multiple The middle straight sections of the heat-absorbing pipes form the heat-absorbing surface side by side; the heat-absorbing surface is fixed on the heat-absorbing pipe holder; the salt outlet pipe section is arranged at one end of the upper header; the salt inlet pipe section is arranged At one end of the lower header; the support frames are respectively arranged in the middle of the upper header and the lower header, and play an auxiliary role in fixing the heat absorber tube assembly.

Further, the outer surface of the heat-absorbing surface described in the utility model is coated with a heat-absorbing coating; the heat-absorbing ability to sunlight is enhanced; The resistance along the molten salt is equal, which avoids the unbalanced flow of the molten salt flowing through the heat-absorbing pipes.

Furthermore, the heat-absorbing pipe, the upper header and the lower header described in the utility model are all equipped with electric heating cables to prevent the molten salt from solidifying at a low temperature and blocking the pipeline.

Furthermore, an insulating layer is provided between the heat absorber shell and the heat absorber tube assembly described in the utility model.

The utility model has the beneficial effects of solving the defects in the background technology, improving the heat absorption efficiency of sunlight on the surface of the heat-absorbing pipe; It solves the problems of local high temperature caused by unbalanced flow of each heat-absorbing pipe and excessive temperature difference inside the heat-absorbing pipe; not only the structure is simple, the cost advantage is obvious, but also it is especially suitable for the field of high-temperature heat utilization of solar energy, which broadens the application of solar energy.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic structural view of a heat absorber tube assembly of the present invention;

In the figure: 1. Heat absorber tube assembly; 2. Heat absorbing tube; 3. Heat absorbing tube holder; 4. Salt outlet pipe section; 5. Heat absorber shell; 6. Support frame; 7. Salt inlet pipe section; 8 Upper header; 9, lower header.

detailed description

Now in conjunction with accompanying drawing and preferred embodiment the utility model is described in further detail. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the utility model, so they only show the configurations related to the utility model.

A molten salt heat absorber as shown in FIG. 1-2 includes a heat absorber tube assembly 1 , a heat absorber shell 5 , and a heat absorber tube holder 3 . The heat absorber tube assembly 1 is a welded assembly composed of a plurality of heat absorbing tubes 2 , an upper header 8 , a lower header 9 , a salt outlet pipe section 4 , a salt inlet pipe section 7 , and a support frame 6 . The middle straight sections of a plurality of heat-absorbing pipes 2 are arranged side by side to form a heat-absorbing surface, and the outer surface of the heat-absorbing surface is coated with a heat-absorbing coating to enhance the heat-absorbing ability to sunlight. The heat-absorbing pipe holder 3 plays the role of keeping fixed to the heat-absorbing surface formed by the side-by-side middle straight sections of a plurality of heat-absorbing pipes 2 . The support frame 6 plays an auxiliary role in fixing the heat absorber tube assembly 1 . Each heat-absorbing pipe 2, upper header 8 and lower header 9 are equipped with electric heating cables to prevent the molten salt from solidifying at a low temperature and blocking the pipeline.

The length of each heat absorbing pipe 2 in the heat absorber pipe assembly 1 is equal, and the resistance of the molten salt along the pipeline from the salt inlet pipe section to the salt outlet pipe section is equal, which avoids the unbalanced flow of molten salt flowing through each heat absorbing pipe 2 . An insulating material is provided between the heat absorber shell 5 and the heat absorber tube assembly 1 .

When working, the cold molten salt that needs to be heated passes through the salt inlet pipe section 7, and is distributed to each heat-absorbing pipe 2 by the lower header 9. (Usually the sunlight projected by the concentrator) absorbs the heat of the sun and heats the molten salt inside. The temperature of the heated molten salt increases and the density decreases. Then it flows out through the salt outlet pipe section 4.

When the molten salt heat sink is on standby or shut down (at night or when there is no sunlight), when the temperature of the molten salt inside the heat sink drops to close to the freezing point of the molten salt, the electric heating cable is energized to heat the molten salt inside the heat sink to prevent melting. The salt solidifies and clogs the pipes. Stop heating after reaching a safe temperature point.

The implementation process can further form a circulating flow and exchange heat with a certain thermal equipment through natural convection heat exchange, or it can be in the form of forced convection through a molten salt pump.

What is described in the above specification is only the specific implementation of the present utility model, and various illustrations do not limit the essential content of the present utility model. Those of ordinary skill in the art can make specific implementations described before after reading the specification. modification or deformation without departing from the essence and scope of the utility model.

Claims (4)

1. a fused salt heat dump, comprises heat dump shell, it is characterized in that: the endothermic tube retainer being provided with heat absorption organ pipe assembly and fixing heat absorption organ pipe assembly in described shell; Described heat absorption organ pipe assembly is by many endothermic tubes, upper header, lower collector pipe and go out salt pipeline section, enter salt pipeline section, the group welding piece formed of bracing frame; The middle straight section of many described endothermic tubes constitutes heat-absorbent surface side by side; Described heat-absorbent surface is fixed on endothermic tube retainer; Described goes out one end that salt pipeline section is arranged on upper header; Described enters one end that salt pipeline section is arranged on lower collector pipe; Described bracing frame is separately positioned on the middle part of upper header and lower collector pipe.

2. fused salt heat dump as claimed in claim 1, is characterized in that: described heat-absorbent surface outer surface scribbles heat absorbing coating; The length of described endothermic tube is impartial.

3. fused salt heat dump as claimed in claim 1, is characterized in that: described endothermic tube, upper header and lower collector pipe are equipped with electric-heating belt companion heat.

4. fused salt heat dump as claimed in claim 1, is characterized in that: be provided with heat-insulation layer between described heat dump shell and heat absorption organ pipe assembly.