Pebble bed molten salt heat storage tank

Abstract

The utility model discloses a pebble bed molten salt heat storage tank, belongs to the technical field of combined heat and power generation, and mainly solves the problems of large occupied area and high investment of a double-tank design of a traditional molten salt system. Comprising a tank body, a first material port and a second material port are formed in the two ends of the tank body respectively, the first material port is communicated with a first cavity, the second material port is communicated with a second cavity, a first distribution pore plate is arranged on the inner side of the first cavity, a second distribution pore plate is arranged on the inner side of the second cavity, and a heat storage element is arranged in the tank body and located between the first distribution pore plate and the second distribution pore plate. The solid pebble bed is adopted as an actual heat storage medium in the storage tank, the use amount of the fused salt is reduced, the cost is further saved, and the stable heat storage capacity and the high-temperature heat storage capacity under normal pressure of the fused salt tank are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cogeneration, and in particular relates to a pebble bed molten salt heat storage tank. Background Art

[0002] Molten salt heat storage systems are currently widely used to solve the technical problem of insufficient flexible operation capacity in the production process of thermal power plants. The operation of the cogeneration unit coupled with the heat storage system can store the electric energy of the unit in the off-peak period in the form of molten salt heat, and replace the unit for heating during the peak period, realizing the movement of energy in time and space dimensions, and improving the flexible operation capacity of the system's power supply and heating.

[0003] At present, in the molten salt heat storage system, the double tank design is mostly used, that is, the hot salt tank is used to store high-temperature molten salt, and the cold salt tank is used to store low-temperature molten salt. This solution occupies a large area and has high investment. Therefore, it is necessary to adopt reasonable technical means to design a new type of molten salt heat storage tank to solve its defect of being difficult to be small and intensive. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a pebble bed molten salt heat storage tank with a reasonable structural design, mainly to solve the problem of large footprint and high investment of the double tank design of the traditional molten salt system.

[0005] The technical solution adopted by the utility model to solve the above-mentioned problem is: a pebble bed molten salt heat storage tank, characterized in that it includes a tank body, wherein two ends of the tank body are respectively provided with a material port one and a material port two, the material port one is communicated with a chamber one, the material port two is communicated with a chamber two, a distribution orifice plate one is provided on the inner side of the chamber one, and a distribution orifice plate two is provided on the inner side of the chamber two, a heat storage element is arranged inside the tank body, and the heat storage element is located between the distribution orifice plate one and the distribution orifice plate two.

[0006] Furthermore, the inner wall of the tank body is provided with a heat-insulating layer.

[0007] Furthermore, the heat storage element is a spherical structure, the surface of the heat storage element is a SiC material layer, and the interior of the heat storage element is a MgO heat storage body.

[0008] Furthermore, the distribution orifice plate 1 and the distribution orifice plate 2 are both provided with flow distribution holes, and raised limiting bosses are provided around the flow distribution holes.

[0009] Compared with the prior art, the utility model has the following advantages and effects: it solves the problem of large floor space and high investment in the double tank design of the traditional molten salt system. The solid ball bed is used as the actual heat storage medium in the storage tank, which reduces the amount of molten salt, further saves costs, and improves the stable heat storage capacity of the molten salt tank and the ability to store high-temperature heat under normal pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the molten salt heat storage tank in the utility model.

[0011] Figure 2 It is a structural schematic diagram of the heat storage element in the utility model.

[0012] Figure 3 It is a structural schematic diagram of the distribution orifice plate in the utility model.

[0013] In the figure: tank body 1, heat storage element 2, distribution orifice plate 1 3, chamber 1 4, material port 1 5, distribution orifice plate 2 6, chamber 2 7, material port 2 8, insulation layer 9, SiC material layer 10, MgO heat storage body 11, flow distribution hole 12, and limiting boss 13. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0015] Example

[0016] See also Figure 1-Figure 3 A pebble bed molten salt heat storage tank comprises a tank body 1, the inner wall of the tank body 1 is provided with a heat preservation layer 9, two ends of the tank body 1 are respectively provided with a material port 1 5 and a material port 2 8, the material port 1 5 is communicated with a chamber 1 4, the material port 2 8 is communicated with a chamber 2 7, a distribution orifice plate 1 3 is provided on the inner side of the chamber 1 4, a distribution orifice plate 2 6 is provided on the inner side of the chamber 2 7, a heat storage element 2 is arranged inside the tank body 1, and the heat storage element 2 is located between the distribution orifice plate 1 3 and the distribution orifice plate 2 6.

[0017] The pebble bed in the tank is formed by stacking the heat storage elements 2. The spherical heat storage elements 2 are as follows: Figure 2 As shown, the diameter is 6cm; the surface is made of high temperature resistant SiC material layer 10, the thickness of which is 1cm; the interior is MgO heat storage body 11, the diameter is 4cm. SiC material has the characteristics of high temperature resistance, corrosion resistance, fluid erosion resistance, and helps to protect the integrity of the internal heat storage body; MgO is used as the heat storage material inside, which has a wide operating temperature range, strong heat storage capacity, and the ability to quickly store and release heat.

[0018] The distribution orifice plate is used to achieve the flow distribution of molten salt when it enters and exits, so that the temperature of the ball bed changes evenly during the heat storage and release process. The structure of the distribution orifice plate is as follows Figure 3 The distribution orifice plate 1 3 and the distribution orifice plate 2 6 are both provided with flow distribution holes 12, and the flow distribution holes 12 are surrounded by raised limiting bosses 13, which are used to limit the position of the heat storage element 2 to prevent the heat storage element 2 from blocking the flow distribution holes 12, and at the same time, the ball bed can be pressed tightly, and the ball bed does not need to be fixed by welding process.

[0019] During heat storage, high-temperature molten salt flows into the tank body 1 from the material port 1 5 , and the heat of the molten salt is stored in the heat storage element 2 through heat exchange, and the low-temperature molten salt flows out of the tank body 1 from the material port 2 8 ; the heat release process is opposite to the heat storage process, the low-temperature molten salt flows into the tank body 1 from the material port 2 8 , the molten salt absorbs heat from the heat storage element 2 , and the high-temperature molten salt flows out of the tank body 1 from the material port 1 5 to conduct heat away.

[0020] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0021] In addition, it should be noted that the above content described in this specification is only an example of the structure of the utility model. All equivalent changes made based on the structure, features and principles described in the utility model patent are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications, supplements or replace the specific embodiments described in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A pebble bed molten salt heat storage tank, characterized in that: The tank body (1) comprises a first material port (5) and a second material port (8) respectively formed at two ends of the tank body (1), the first material port (5) being in communication with the first chamber (4), the second material port (8) being in communication with the second chamber (7), the first distribution orifice plate (3) being provided on the inner side of the first chamber (4), the second distribution orifice plate (6) being provided on the inner side of the second chamber (7), a heat storage element (2) being arranged inside the tank body (1), the heat storage element (2) being located between the first distribution orifice plate (3) and the second distribution orifice plate (6); The heat storage element (2) is a spherical structure, the surface of the heat storage element (2) is a SiC material layer (10), and the interior of the heat storage element (2) is a MgO heat storage body (11); The distribution orifice plate 1 (3) and the distribution orifice plate 2 (6) are both provided with flow distribution holes (12), and raised limiting bosses (13) are provided around the flow distribution holes (12).

2. The pebble bed molten salt heat storage tank according to claim 1 is characterized in that: The inner wall of the tank body (1) is provided with a heat-insulating layer (9).

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