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CN-122015552-A - Solid heat storage equipment with high heat storage temperature

CN122015552ACN 122015552 ACN122015552 ACN 122015552ACN-122015552-A

Abstract

The invention discloses a solid heat storage device with high heat storage temperature, which comprises a heat storage body and a heat preservation mechanism, wherein the heat storage body comprises a heat storage brick and an electric heating wire assembly, the electric heating wire assembly comprises a connecting plate and a spiral electric heating wire connected to the connecting plate, and the heat preservation mechanism comprises a side wall, a top wall and a concrete foundation. The side wall and the top wall respectively comprise an outer heat preservation layer, an inner heat preservation layer and a phase change heat storage module positioned between the side wall and the top wall. The phase-change heat storage module comprises a phase-change heat storage module shell, the heat exchange tube of the heat preservation layer is arranged in the phase change heat storage module shell and is filled with phase change heat storage materials. The inner heat-insulating layer is an aluminum silicate fiber module. The heat exchange tube of the foundation layer is embedded in the concrete foundation. By improving the heating wire materials, the heat preservation measures, the heat accumulator structure and the like, the problems that the heating wire has poor temperature resistance and short service life in a high-temperature environment, the external heat preservation measures are difficult to meet the requirements, the heat accumulator is easy to deform and the like are solved.

Inventors

  • WANG QING
  • ZHONG KEZHI
  • SONG DEJUN
  • JIANG JING

Assignees

  • 烟台卓越新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260408

Claims (10)

  1. 1. The solid heat storage equipment with the high heat storage temperature comprises a heat storage body (1) and a heat preservation mechanism, wherein the heat storage body (1) comprises a heat storage brick (1-1) and an electric heating wire assembly (5), the electric heating wire assembly (5) comprises a connecting plate (5-1) and a spiral electric heating wire (5-2) connected to the connecting plate (5-1), the heat preservation mechanism comprises a side wall (3), a top wall (2) and a concrete foundation (8), and the solid heat storage equipment is characterized in that the side wall (3) and the top wall (2) respectively comprise an outer heat preservation layer, an inner heat preservation layer and a phase change heat storage module located between the outer heat preservation layer and the inner heat preservation layer, the phase change heat storage module comprises a phase change heat storage module shell (14), a heat preservation layer heat exchange tube (12) is installed in the phase change heat storage module shell (14) and is filled with a phase change heat storage material (13), the inner heat preservation layer is an aluminum silicate fiber module, and a foundation layer heat exchange tube (11) is pre-buried inside the concrete foundation (8).
  2. 2. The solid heat storage device with high heat storage temperature according to claim 1, wherein the heat storage brick (1-1) is provided with a thermocouple jack (1-4), and the solid heat storage device comprises a corundum thermocouple (4) penetrating into the thermocouple jack (1-4) from a side wall (3) and used for detecting the temperature of a heat storage body.
  3. 3. The solid heat storage device with high heat storage temperature according to claim 1, wherein the solid heat storage device comprises an infrared temperature sensor (6) for detecting the temperature of the spiral heating wire, the infrared temperature sensor (6) penetrates into the inner space of the heat preservation mechanism from the side wall (3), and a high-purity quartz glass lens (7) is arranged at the inner end of the solid heat storage device.
  4. 4. The solid heat storage device with high heat storage temperature as set forth in claim 1, wherein two ends of the heat-insulating layer heat exchange tube (12) are respectively penetrated out of the phase-change heat storage module shell (14) as tube side medium inlet and outlet ends and are connected with a header, and two ends of the base layer heat exchange tube (11) are respectively penetrated out of the concrete base (8) as tube side medium inlet and outlet ends and are connected with the header.
  5. 5. The solid heat storage device with high heat storage temperature as claimed in claim 1, wherein the aluminum silicate fiber module adopts a high-purity aluminum silicate fiber heat preservation module, wherein Al 2 O 3 ≥ 47%;Al 2 O 3 + SiO 2 is more than or equal to 99%.
  6. 6. The solid heat storage device with high heat storage temperature as claimed in claim 1, wherein the upper surface and the lower surface of the heat storage bricks (1-1) are of concave-convex structures in a mutually matched and inserted mode, and expansion joints are reserved between adjacent heat storage bricks (1-1) in the horizontal direction.
  7. 7. A solid heat storage device with high heat storage temperature as claimed in claim 1, wherein the connecting plate (5-1) is fixed on the heat storage brick of the heat storage body end by a fixing bolt (1-3).
  8. 8. The solid heat storage device with high heat storage temperature as claimed in claim 1, wherein the phase change heat storage material (13) is formed by compounding magnesium sulfate heptahydrate, sodium dihydrogen phosphate dihydrate, a nucleating agent and a thickening agent.
  9. 9. The solid heat storage device with high heat storage temperature as set forth in any one of claims 1 to 8, wherein the spiral heating wire (5-2) is made of 0Cr27Al7Mo2NbY, wherein the 0Cr27Al7Mo2NbY is made of 28.0-30.0% by mass of chromium, 8.0-10.0% by mass of aluminum, 1.5-2.5% by mass of molybdenum, less than or equal to 0.08% by mass of carbon, less than or equal to 1.0% by mass of silicon, less than or equal to 1.0% by mass of manganese, less than or equal to 0.03% by mass of phosphorus, less than or equal to 0.030% by mass of sulfur, 0.07-0.13% by mass of yttrium, 0.20-0.40% by mass of niobium, 0.70-0.90% by mass of titanium, and the balance of iron and unavoidable impurity elements, and the weight of the unavoidable impurity elements is less than or equal to 0.05%.
  10. 10. The high heat storage temperature solid heat storage device as set forth in claim 9 wherein said 0Cr27Al7Mo2NbY material is prepared by the steps of: Firstly, mixing all raw materials according to element proportion, adding the mixture into a vacuum induction smelting furnace for vacuum induction smelting, controlling the vacuum degree to be 10 -2 kPa, the smelting temperature to be 1560-1600 ℃ and the refining time to be 30-60 min; Wherein, the addition of yttrium (Y) uses Al-Y intermediate alloy, and the addition of niobium (Nb) uses Fe-Nb intermediate alloy; Secondly, performing hot working on the steel ingot formed after smelting, wherein the temperature of the hot working is 900-1000 ℃; And thirdly, cogging and hot rolling the steel ingot after hot working to form a wire rod.

Description

Solid heat storage equipment with high heat storage temperature Technical Field The invention relates to a solid heat storage device, in particular to a solid heat storage device with high heat storage temperature (such as 1000 ℃ in heat storage temperature). Background The heat accumulation temperature of the existing solid heat accumulation equipment is basically below 800 ℃. With the change of the requirements (such as 530 ℃ C./25 MPa steam) of the solid heat storage device on the aspect of high-temperature high-pressure steam, higher requirements are put on the heat storage temperature of the solid heat storage device, such as the heat storage temperature requirement reaches 1000 ℃. To achieve this temperature, existing equipment manufacturing techniques and processes have a number of problems. The electric heating wires of the iron-based high-temperature alloy (such as 0Cr25Al5 and 0Cr27Al7Mo 2) of the first and the existing solid heat storage equipment can normally run at the temperature of about 1200 ℃ (when the temperature of the heat storage is up to 1000 ℃ and the temperature of the electric heating wires is up to 1150-1250 ℃), but the service life is greatly shortened, and the electric heating wires cannot adapt to the normal use and maintenance period of the equipment. And when the second heat storage temperature reaches 1000 ℃, the heat storage body has larger expansion amount, and is easy to deform and damage. Thirdly, the spiral heating wire is easy to creep at the temperature of 1200 ℃ to expand the range of the heat accumulator, so that the interlayer heating wire is short-circuited, and the equipment is in fault. Fourth, because 10KV or 35KV high voltage electricity is introduced into the heating wire, contact measurement cannot be adopted, and the temperature difference between the outer surface and the inner part of the heat accumulator is large. Therefore, when the heat storage temperature reaches 1000 ℃, the detection of the temperature of the heating wire and the heat storage is not easy. Fifth, when the heat storage temperature reaches 1000 ℃, the existing external heat preservation measures are difficult to meet the requirements. First, the outer insulation material requires an expensive material resistant to 1200 ℃. Secondly, by utilizing the existing heat preservation measures, the heat preservation loss of the 800 ℃ heat storage body reaches 3% -5%, and the heat preservation loss is larger at the temperature of 1000 ℃, so that special heat preservation measures are needed. Disclosure of Invention The invention aims to solve the technical problems that the solid heat storage equipment with high heat storage temperature is provided, and the problems that the heat resistance of an electric heating wire is poor, the service life is short, the external heat preservation measure is difficult to meet the requirement, the heat storage body is easy to deform, the spiral electric heating wire is easy to creep to cause interlayer electric heating wire short circuit, the heat storage body temperature is difficult to detect and the like are solved by improving the electric heating wire material, the heat preservation measure, the heat storage body structure and the like. The technical scheme of the invention is as follows: The solid heat storage equipment with the high heat storage temperature comprises a heat storage body and a heat preservation mechanism, wherein the heat storage body comprises a heat storage brick and an electric heating wire assembly, the electric heating wire assembly comprises a connecting plate and a spiral electric heating wire connected to the connecting plate, the heat preservation mechanism comprises a side wall, a top wall and a concrete foundation, the side wall and the top wall respectively comprise an outer heat preservation layer, an inner heat preservation layer and a phase change heat storage module positioned between the outer heat preservation layer and the inner heat preservation layer, the phase change heat storage module comprises a phase change heat storage module shell, heat preservation heat exchange pipes are installed in the phase change heat storage module shell and are filled with phase change heat storage materials, the inner heat preservation layer is an aluminum silicate fiber module, and a foundation layer heat exchange pipe is embedded in the concrete foundation. The solid heat storage device comprises a corundum thermocouple penetrating into the thermocouple insertion hole from the side wall and used for detecting the temperature of the heat storage body. The solid heat storage device comprises an infrared temperature sensor for detecting the temperature of the spiral heating wire, wherein the infrared temperature sensor penetrates into the inner space of the heat preservation mechanism from the side wall, and a high-purity quartz glass lens is arranged at the inner end of the infrared temperature sensor. The two ends of the heat exchange t