Solar molten salt furnace resistant cold and hot sudden change refractory lining structure

Abstract

This utility model discloses a refractory lining structure for a solar molten salt furnace that resists rapid thermal changes, belonging to the technical field of molten salt furnace linings. It includes multiple metal fixing rods, the outer ends of which are fixedly connected to the inner wall of the molten salt furnace. The inner side of each metal fixing rod is provided with a wear-resistant casting layer, the inner side of which is provided with a steel fiber casting layer, and the inner side of which is provided with a refractory brick layer composed of several refractory bricks spliced ​​together. This utility model uses the thin end of the metal fixing rod to insert into a channel, creating tension on the refractory bricks, effectively preventing them from falling off. The refractory coating reduces thermal stress concentration, making the heating of the lining more uniform and improving the thermal shock resistance of the molten salt furnace lining. The molten salt furnace lining structure of this utility model greatly improves the thermal shock resistance of the molten salt furnace lining.

Description

Technical Field

[0001] This utility model relates to the field of molten salt furnace lining technology, specifically to a refractory lining structure for solar molten salt furnaces that is resistant to rapid temperature changes. Background Technology

[0002] The solar molten salt furnace is the core device of a solar thermal power generation system. It drives power generation by storing the high-temperature heat energy generated by solar energy, combining environmental protection and high efficiency. Its working principle is based on a large-scale reflector array that focuses sunlight onto the heat collection tubes, heating the molten salt flowing through them to a temperature of 500-600℃. The high-temperature molten salt then flows into a storage tank for temporary storage, releasing heat at night or on cloudy days to generate electricity through a steam turbine, achieving a continuous day and night energy supply.

[0003] The lining of a molten salt furnace is the core protective layer of the system, responsible for maintaining the structural integrity and thermal efficiency of the equipment in a high-temperature, corrosive environment. Molten salt furnaces are mainly used in solar thermal power generation, metallurgy, and chemical industries, and the lining material must withstand the chemical erosion, mechanical wear, and drastic temperature fluctuations of molten salt.

[0004] Drastic temperature changes in molten salt furnaces cause thermal stress concentration, leading to cracking, spalling, and even penetrating damage to the lining. As the cracks expand, high-temperature molten salt seeps out, which may ignite combustibles or corrode the equipment foundation, threatening operational safety. Damaged linings require emergency shutdown for repairs, resulting in production interruptions and increased maintenance costs. Existing molten salt furnace linings do not have sufficient thermal shock resistance, which can cause the above problems. Therefore, a refractory lining structure resistant to rapid temperature changes is needed for solar molten salt furnaces. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a refractory lining structure for solar molten salt furnaces that is resistant to rapid temperature changes.

[0006] The technical solution of this utility model is: a refractory lining structure for a solar molten salt furnace that is resistant to rapid temperature changes, including multiple metal fixing rods, the outer ends of which are fixedly connected to the inner wall of the molten salt furnace. The inner side of each metal fixing rod is provided with a wear-resistant casting layer, the inner side of which is provided with a steel fiber casting layer, and the inner side of which is provided with a refractory brick layer composed of several refractory bricks spliced ​​together.

[0007] Furthermore, the refractory brick body includes an inner corundum layer and an outer lightweight high-alumina layer, and the outer side of the lightweight high-alumina layer is provided with multiple channels.

[0008] Explanation: The back of the refractory brick is coated with steel fiber castable and then bonded to the wear-resistant castable layer. In this way, the refractory brick is attached to the inner wall of the molten salt furnace. The pores are filled with steel fiber castable, which makes the refractory brick and the steel fiber castable layer bond more firmly.

[0009] Furthermore, the metal fixing rod includes a thick end and a thin end, the thin end being inserted into a portion of the channel, and the thick end being located within the wear-resistant casting layer and the steel fiber casting layer.

[0010] Note: The thin end is bonded to the refractory brick body through steel fiber castable, and the metal fixing rod can provide a certain tensile force to the refractory brick body, reducing the risk of the refractory brick body falling off.

[0011] Furthermore, each of the left and right sides of the refractory brick body is provided with a notch for splicing with adjacent refractory brick bodies.

[0012] Explanation: By using notches to splice two adjacent refractory bricks together to form a complete refractory brick layer, the interlocking of the refractory bricks can reduce the risk of refractory bricks falling off.

[0013] Furthermore, the surface of the refractory brick is also provided with a refractory coating.

[0014] Note: The refractory coating is made of Al2O3-SiC with a thickness of 0.5-2mm. The refractory coating can prevent the intrusion of external impurities and resist the effects of mechanical wear or oxidizing atmosphere.

[0015] The beneficial effects of this utility model are:

[0016] This invention uses a metal fixing rod with its thin end inserted into the channel to apply tension to the refractory bricks, effectively preventing them from falling off. The refractory coating reduces thermal stress concentration, making the lining more evenly heated and improving the thermal shock resistance of the molten salt furnace lining. The corundum layer directly enhances thermal shock resistance through its high density and low expansion characteristics, while the lightweight high-alumina layer buffers thermal stress through its low density and controllable pore structure. The combination of these two elements forms a "rigid and flexible" protective system. The steel fiber casting layer significantly improves the thermal shock resistance of the molten salt furnace lining through mechanisms such as crack suppression, stress dispersion, and structural reinforcement. The wear-resistant casting layer, through its high-hardness matrix, fiber reinforcement, and dense structure, provides multiple layers of protection against wear, erosion, and thermal shock in the molten salt furnace lining. The molten salt furnace lining structure of this invention greatly improves the thermal shock resistance of the molten salt furnace lining. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a splicing diagram of the refractory brick body of this utility model.

[0019] Figure 3 This is a top view of the refractory brick structure of this utility model.

[0020] Among them, 1-metal fixing rod, 2-wear-resistant casting layer, 3-steel fiber casting layer, 4-refractory brick body, 5-refractory brick layer, 41-corundum layer, 42-lightweight high alumina layer, 43-channel, 11-coarse end, 12-fine end, 44-notch, 6-refractory coating. Detailed Implementation

[0021] Example 1:

[0022] like Figure 1 , Figure 2 As shown, a refractory lining structure for a solar molten salt furnace, resistant to rapid thermal changes, includes multiple metal fixing rods 1. The outer ends of the metal fixing rods 1 are fixedly connected to the inner wall of the molten salt furnace. A wear-resistant castable layer 2 is provided on the inner side of each metal fixing rod 1. A steel fiber castable layer 3 is provided on the inner side of the wear-resistant castable layer 2. A refractory brick layer 5, composed of several refractory bricks 4 spliced ​​together, is provided on the inner side of the steel fiber castable layer 3. The wear-resistant castable layer 2 is cast using silicon carbide wear-resistant castable, and the steel fiber castable layer 3 is cast using steel fiber wear-resistant castable from Wuhan Kanos Company.

[0023] The refractory brick body 4 includes an inner corundum layer 41 and an outer lightweight high-alumina layer 42, with multiple channels 43 on the outer side of the lightweight high-alumina layer 42. The corundum layer 41 is a material of existing technology, such as the LY-Zirconia-Alumina series or LY-ZA18 model products produced by Shandong Luyang Energy Conservation. The lightweight high-alumina layer 42 is also a material of existing technology, such as high-alumina refractory materials produced by Zibo Senmu Energy Conservation Technology Co., Ltd.

[0024] The back of the refractory brick 4 is coated with steel fiber castable and then bonded to the wear-resistant castable layer 2. In this way, the refractory brick 4 is attached to the inner wall of the molten salt furnace. The ducts 43 are filled with steel fiber castable, which makes the refractory brick 4 bonded to the steel fiber castable layer 3 more firmly.

[0025] The metal fixing rod 1 includes a thick end 11 and a thin end 12. The diameter ratio of the thick end 11 to the thin end 12 can be, for example, 2:1. The thin end 12 is inserted into the hole 43, and the thick end 11 is located in the wear-resistant casting layer 2 and the steel fiber casting layer 3.

[0026] The fine end 12 is bonded to the refractory brick body 4 by steel fiber castable. The metal fixing rod 1 can provide a certain tensile force to the refractory brick body 4, reducing the risk of the refractory brick body 4 falling off. The steel fiber castable is a castable of existing technology. For example, the LY-SFC15 model of the LY SteelFiber Castables series produced by Shandong Luyang Energy Conservation can be used.

[0027] Example 2:

[0028] The difference between this embodiment and embodiment 1 is that each of the left and right sides of the refractory brick body 4 is provided with a notch 44 for splicing with the adjacent refractory brick body 4.

[0029] Compared with Example 1, this embodiment uses notch 44 to splice two adjacent refractory bricks 4 together to form the entire refractory brick layer 5. The interlocking of the refractory bricks 4 can reduce the risk of refractory bricks falling off.

[0030] Example 3:

[0031] The difference between this embodiment and embodiment 1 is that the surface of the refractory brick body 4 is further provided with a refractory coating 6.

[0032] The refractory coating 6 in this embodiment is existing technology. For example, the PN-ASC15 product of the PN Al-SiC Coatings series from Puyang Puyang High Temperature Materials (Group) Co., Ltd. can be used, with a thickness of 0.5-2mm. The refractory coating can prevent the intrusion of external impurities and resist the effects of mechanical wear or oxidizing atmosphere.

[0033] The construction method of the refractory lining in Example 3 above includes the following steps:

[0034] S1. Fix the thick ends 11 of multiple metal fixing rods 1 to the inner wall of the molten salt furnace, and then pour the wear-resistant castable into the inner wall of the molten salt furnace to form a wear-resistant castable layer 2. Cover the back of the refractory brick body 4 with corundum castable and then attach it to the wear-resistant castable layer 2.

[0035] S2, the way wear-resistant bricks 4 are spliced ​​together is as follows: Figure 3 As shown, the thin end 12 of the metal fixing rod 1 is inserted into part of the channel 43.

Claims

1. A cold-thermal shock resistant refractory lining structure for a solar molten salt furnace, characterized by, It includes multiple metal fixing rods (1), the outer ends of which are fixedly connected to the inner wall of the molten salt furnace. The inner side of the metal fixing rods (1) is provided with a wear-resistant casting layer (2), the inner side of the wear-resistant casting layer (2) is provided with a steel fiber casting layer (3), and the inner side of the steel fiber casting layer (3) is provided with a refractory brick layer (5) formed by splicing together several refractory bricks (4).

2. A solar molten salt furnace with a cold and hot shock resistant refractory lining structure as claimed in claim 1, wherein, The refractory brick body (4) includes an inner corundum layer (41) and an outer lightweight high-alumina layer (42), and the outer side of the lightweight high-alumina layer (42) is provided with multiple channels (43).

3. A solar molten salt furnace with a cold and hot shock resistant refractory lining structure as claimed in claim 2, wherein, The metal fixing rod (1) includes a thick end (11) and a thin end (12), the thin end (12) is inserted into part of the channel (43), and the thick end (11) is located in the wear-resistant casting layer (2) and the steel fiber casting layer (3).

4. The refractory lining structure for a solar molten salt furnace as described in claim 1, characterized in that, Each of the left and right sides of the refractory brick body (4) is provided with a notch (44) for splicing with the adjacent refractory brick body (4).

5. The refractory lining structure for a solar molten salt furnace as described in claim 1, characterized in that, The surface of the refractory brick body (4) is also provided with a refractory coating (6).

Images