A structure for effectively reducing heat leakage of metal heat preservation in a nuclear power plant

Abstract

The present application belongs to the technical field of heat preservation, and particularly relates to a structure for effectively reducing heat leakage of metal heat preservation in a nuclear power plant, which is applied to heat preservation of annular gaps between metal heat preservation blocks, instrument pipe gaps and tee pipe sections in the nuclear power plant. A long T-shaped heat preservation block is installed at a specified position of a pipeline, and a metal heat preservation block is abutted with the long T-shaped heat preservation block to ensure that the annular gap position is dense. A long L-shaped heat preservation block is installed at an instrument branch pipe, and the metal heat preservation block is abutted with the long L-shaped heat preservation block. Heat preservation of the tee pipe section is divided into four metal heat preservation blocks which are spliced through a buckle abutment mode. The long T-shaped heat preservation block is abutted with the metal heat preservation block at the upper annular gap and the horizontal pipe section annular gap position. The present application is favorable for improving the heat preservation performance effect of the metal heat preservation and the on-site disassembly and assembly work efficiency, can greatly reduce on-site heat leakage, effectively reduce heat dissipation of the nuclear power plant equipment / system, reduce heat loss of each system in the production plant during operation of the unit, and improve the economy of the unit.

Description

Technical Field

[0001] This invention belongs to the field of thermal insulation technology, specifically relating to a structure for effectively reducing heat leakage from metal insulation in nuclear power plants, which is applied to the insulation of circumferential seams between metal insulation blocks, gaps in instrument pipes, and tee pipe sections in nuclear power plants. Background Technology

[0002] Currently, the metal insulation used in nuclear power plants has certain gap requirements in its installation process. Due to the principle of thermal expansion and contraction caused by changes in pipe temperature, in order to avoid deformation and damage caused by compression during the deformation process, a gap of 3-5mm is required during the installation process to allow for expansion and contraction. After the metal insulation reaches a certain length, an expansion gap of about 2cm needs to be reserved. After the metal insulation expands due to heat, there may be a situation where the expansion coefficient or expansion direction is inconsistent with the original design, resulting in heat leakage due to gaps in the insulation.

[0003] However, the existence of gaps means that the insulation is not fully wrapped or that the insulation performance cannot be 100% achieved. Heat convection forms in the gaps, carrying heat away and causing significant heat loss, resulting in an increase in the ambient temperature. Due to the special working environment of thermal expansion and contraction, the initial dimensional measurement and installation of insulation are quite difficult. Larger dimensions may allow sufficient space, but result in greater heat leakage. Smaller dimensions may cause the insulation to burst open after expansion, leading to insulation failure on site. Summary of the Invention

[0004] The purpose of this invention is to provide a structure for nuclear power plants that effectively reduces heat leakage from metal insulation, specifically for horizontal and vertical metal insulation pipe sections and tees in nuclear power plants.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A structure for nuclear power plants to effectively reduce heat leakage from metal insulation includes: long T-shaped insulation blocks installed at designated locations on pipelines; metal insulation blocks are mated to the long T-shaped insulation blocks to ensure a tight circumferential joint; long L-shaped insulation blocks are installed on instrument branch pipes, with metal insulation blocks fitted together; the insulation of a tee section consists of four metal insulation blocks, spliced ​​together by snap-fit ​​connections; the upper circumferential joint and the circumferential joint of the horizontal pipe section are mated to the metal insulation using long T-shaped insulation blocks.

[0007] Join the long T-shaped insulation block at the circumferential joint with the first installed metal insulation block, wrap it around the bare pipe once, and then fix the joint to ensure that the long T-shaped insulation block is firmly installed on the bare pipe. Then, attach the remaining metal insulation block to the long T-shaped insulation block and fit it tightly together. Repeat the above steps to complete the insulation installation of a section of the pipe.

[0008] Use long L-shaped insulation blocks to wrap around the connection between the instrument pipe and the horizontal pipe. After wrapping the insulation block around the instrument pipe once, fix the joint position. Press down firmly on the installed long L-shaped insulation block to ensure that the long L-shaped insulation block is tightly attached to the contact surface of the bare pipe. Then install the metal insulation block.

[0009] The heat of the T-joint pipe is concentrated at the corner of the T-joint. The insulation circumferential joint is raised to the straight pipe section and divided into four insulation sections. The resulting circumferential joint is sealed with long T-shaped insulation blocks.

[0010] After wrapping the cord around the bare tube once, use metal Velcro to secure the connector.

[0011] The metal insulation blocks and the long T-shaped insulation blocks are tightly spliced ​​together by pushing them horizontally.

[0012] After wrapping the tube around the instrument tube once, use metal Velcro to secure the connector.

[0013] Then install the metal insulation blocks, ensuring that there are no gaps between the metal insulation and the long L-shaped insulation blocks during the installation process.

[0014] The beneficial effects achieved by this invention are as follows:

[0015] This invention features a simple structure and is easy, quick, and secure to install. It improves the insulation performance of metal insulation and enhances the efficiency of on-site assembly and disassembly. It significantly reduces on-site insulation leakage, effectively minimizes heat dissipation from nuclear power plant equipment / systems, reduces heat loss from various systems within the production building during unit operation, and improves the unit's economic efficiency. Furthermore, when applied to poorly ventilated or relatively enclosed spaces, it can significantly lower ambient temperatures, reduce potential hazards to equipment operation within the production building, and improve the safety and reliability of the unit. Attached Figure Description

[0016] Figure 1 Schematic diagram of the application of long T-shaped insulation block circumferential joint;

[0017] Figure 2 This is a schematic diagram of a long, T-shaped insulation block.

[0018] Figure 3 Image showing the effect of laying out long, T-shaped insulation blocks;

[0019] Figure 4 This is a schematic diagram of the structure of the long L-shaped insulation block for the instrument pipe section;

[0020] Figure 5 This is an application scenario diagram of the long L-shaped insulation block for instrument pipe sections;

[0021] Figure 6 This is a diagram of a metal insulation structure for a tee pipe section;

[0022] In the picture: 1. T-shaped long strip insulation block; 2. Insulation buckle; 3. Metal insulation; 4. Pipe body; 5. Metal hook and loop fastener; 6. Metal loop and loop fastener. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] The long T-shaped insulation blocks are installed at the designated positions on the pipeline using positioning methods. Then, the metal insulation is installed and joined to the long T-shaped insulation blocks to ensure a tight seal at the circumferential joint. For instrument branch pipe sections, long L-shaped insulation blocks are installed on the instrument branch pipes, with the metal insulation blocks fitted snugly against the long L-shaped insulation blocks. The tee pipe section insulation consists of four metal insulation pieces, spliced ​​together using a snap-fit ​​connection. The upper circumferential joint and the circumferential joint of the horizontal pipe section still use long T-shaped insulation blocks joined to the metal insulation.

[0025] Long T-shaped insulation blocks are installed between the metal insulation ring seams to block heat dissipation; long L-shaped insulation blocks are installed at the instrument branch pipes to block heat dissipation; the metal insulation method at the tee position is changed by moving the ring seam upwards, and the insulation block is assembled into four pieces. A locking buckle is added in the middle to reduce the pressure on the upper buckles and prevent them from breaking open due to excessive force during operation. This method is easier to install than the original method, as the splicing of insulation blocks and the overlapping of the buckles reduce on-site installation difficulty and improve the efficiency of on-site insulation assembly and disassembly.

[0026] See Figure 1 This diagram illustrates the application of a long T-shaped insulation block at a circumferential joint. The insulation block enhances insulation performance by fitting snugly into the gaps of the metal insulation. First, the long T-shaped insulation block at the circumferential joint is joined to the first installed metal insulation block. It is wrapped around the bare pipe once and secured with metal Velcro fasteners to ensure a stable installation. Second, the remaining metal insulation block is then joined to the long T-shaped insulation block, and then pushed horizontally to tightly connect them. This process is repeated until the insulation installation of a section of pipe is complete.

[0027] Refer to Figure 5The instrument pipe section uses long L-shaped insulation blocks to wrap around the connection between the instrument pipe and the horizontal pipe, similar to the installation method of the long T-shaped insulation blocks mentioned above. After wrapping around the instrument pipe once, metal Velcro is used to fix the joint position. The installed long L-shaped insulation blocks are pressed down firmly to ensure that the long L-shaped insulation blocks are tightly attached to the contact surface of the bare pipe. Then, the metal insulation is installed. During the installation process, it is ensured that there are no gaps between the metal insulation and the long L-shaped insulation blocks to ensure that the insulation performance meets the usage requirements.

[0028] This invention also makes some changes to the metal insulation method, which can be found in [reference needed]. Figure 6 Because the heat from the tee pipes is concentrated at the tee's angle, to reduce heat loss at this location, the insulation circumferential joint is raised to the straight pipe section and divided into four insulation blocks. This is to distribute the stress and prevent the clamps from breaking or the insulation from loosening due to thermal expansion and contraction. The resulting circumferential joint is sealed with long T-shaped insulation blocks. This ensures the insulation effect while avoiding the deformation of metal insulation due to thermal expansion and contraction, which could lead to irreversible installation or damage.

[0029] This invention provides a structure for nuclear power plants to effectively reduce heat leakage from metal insulation. By adding novel long T-shaped insulation blocks to the circumferential seams of the metal insulation in horizontal pipe sections and long L-shaped insulation blocks to the instrument branch pipe sections, the gaps that were originally necessary to prevent thermal expansion and contraction are filled, reducing heat convection within the insulation and thus preventing increased heat loss from equipment pipelines. This change in the metal insulation of the tee pipe not only solves the heat loss problem but also avoids excessive stress on the clamps, fully meeting the insulation requirements of the on-site environment.

Claims

1. A structure for effectively reducing heat leakage from metal insulation in nuclear power plants, characterized in that: Long T-shaped insulation blocks are installed at designated locations on the pipeline. Metal insulation blocks are then fitted together with the long T-shaped insulation blocks to ensure a tight seal at the circumferential joint. Long L-shaped insulation blocks are installed on instrument branch pipes, with metal insulation blocks fitted together with the long L-shaped insulation blocks. The insulation of the tee section consists of four metal insulation blocks, which are spliced ​​together using a snap-fit ​​connection. The upper circumferential joint and the circumferential joint of the horizontal pipe section are fitted together with long T-shaped insulation blocks and metal insulation blocks.

2. The nuclear power plant structure for effectively reducing heat leakage of a metal heat insulator according to claim 1, characterized by: Join the long T-shaped insulation block at the circumferential joint with the first installed metal insulation block, wrap it around the bare pipe once, and then fix the joint to ensure that the long T-shaped insulation block is firmly installed on the bare pipe. Then, attach the remaining metal insulation block to the long T-shaped insulation block and fit it tightly together. Repeat the above steps to complete the insulation installation of a section of the pipe.

3. The nuclear power plant structure for effectively reducing heat leakage of a metal heat insulator according to claim 1, characterized by: Use long L-shaped insulation blocks to wrap around the connection between the instrument pipe and the horizontal pipe. After wrapping the insulation block around the instrument pipe once, fix the joint position. Press down firmly on the installed long L-shaped insulation block to ensure that the long L-shaped insulation block is tightly attached to the contact surface of the bare pipe. Then install the metal insulation block.

4. The nuclear power plant structure for effectively reducing heat leakage of a metal heat insulator according to claim 1, characterized by: The heat of the T-joint pipe is concentrated at the corner of the T-joint. The insulation circumferential joint is raised to the straight pipe section and divided into four insulation sections. The resulting circumferential joint is sealed with long T-shaped insulation blocks.

5. The nuclear power plant structure for effectively reducing heat leakage of a metal heat insulator according to claim 2, characterized by: After wrapping the cord around the bare tube once, use metal Velcro to secure the connector.

6. The nuclear power plant structure for effectively reducing heat leakage of a metal heat insulator according to claim 2, characterized by: The metal insulation blocks and the long T-shaped insulation blocks are tightly spliced ​​together by pushing them horizontally.

7. The nuclear power plant structure for effectively reducing heat leakage of a metal heat insulator according to claim 3, characterized by: After wrapping the tube around the instrument tube once, use metal Velcro to secure the connector.

8. The nuclear power plant structure for effectively reducing heat leakage of a metal heat insulator according to claim 3, characterized by: Then install the metal insulation blocks, ensuring that there are no gaps between the metal insulation and the long L-shaped insulation blocks during the installation process.

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