Temporary ventilation system arranged in steel containment

Abstract

The invention discloses a temporary ventilation system arranged in a steel containment vessel, which is suitable for the steel containment vessel and comprises an upper exhaust system, a lower exhaust system, a first transverse and vertical main pipe assembly and a second transverse and vertical main pipe assembly, and the upper exhaust system and the lower exhaust system are both arranged in the steel containment vessel. The upper exhaust system is arranged at the upper end of the lower exhaust system, one end of the first transverse and vertical main pipe assembly extends into the steel containment and is connected with the upper exhaust system, and one end of the second transverse and vertical main pipe assembly extends into the steel containment and is connected with the second transverse and vertical pipe assembly. Through the application of the invention, the temporary ventilation system arranged in the steel containment vessel is provided, and the temporary ventilation system can effectively collect flue gas generated at different heights, so that the sedimentation and residual rate of the flue gas in the steel containment vessel can be reduced; in addition, the probability that the temporary ventilation item occupies the space of the formal item is reduced, more sufficient space is provided for construction of the formal item, and the space utilization rate of the steel containment is increased.

Description

Technical Field

[0001] This invention relates to the field of ventilation installation technology, and more particularly to a temporary ventilation system installed inside a steel containment building. Background Technology

[0002] In the field of nuclear power plant construction, for nuclear reactor types such as AP1000, CAP1000, and CAP1400 that have steel containment structures, ventilation is crucial during the civil engineering and installation phases after the steel containment structure is capped. During this phase, grinding, welding, and other operations generate large amounts of fumes, which, if not effectively and promptly removed, will seriously impact the construction environment and the health of personnel.

[0003] The current standard practice in China for temporary ventilation of steel containment structures involves using the equipment gates attached to the steel containment structure as outlets. By establishing a main temporary exhaust system and supplementing it with local temporary supply air, the system effectively removes fumes generated during grinding and welding within the containment structure and introduces fresh air to circulate the system. However, this conventional approach has its limitations. During the construction phase after the steel containment structure is capped, there are numerous construction sites. If small axial flow fans and temporary ventilation hoses are installed at each site, it will occupy a significant amount of space within the containment. Given the limited space within the containment, the extensive placement of such equipment will not only affect the construction progress of the permanent structures within the containment but also greatly increase the risk to the protection of these finished structures. Summary of the Invention

[0004] In view of this, in order to solve the above problems, the purpose of the present invention is to provide a temporary ventilation system installed inside a steel containment vessel, applicable to steel containment vessels, comprising: an upper exhaust system, a lower exhaust system, a first horizontal and vertical main pipe assembly, and a second horizontal and vertical main pipe assembly. Both the upper exhaust system and the lower exhaust system are installed inside the steel containment vessel, and the upper exhaust system is installed at the upper end of the lower exhaust system. One end of the first horizontal and vertical main pipe assembly extends into the steel containment vessel and is connected to the upper exhaust system, and one end of the second horizontal and vertical main pipe assembly extends into the steel containment vessel and is connected to the second horizontal and vertical pipe assembly.

[0005] In another preferred embodiment, the upper exhaust system includes a dome duct, a circumferential secondary duct, and a circumferential main duct arranged sequentially from top to bottom. A duct support is provided on the inner wall of the steel containment building. The dome duct, the circumferential secondary duct, and the circumferential main duct are all installed on the duct support and connected to the first horizontal and vertical main duct assembly.

[0006] In another preferred embodiment, the lower exhaust system includes a four-layer pipe and a five-layer pipe arranged sequentially from top to bottom, both of which are connected to the second horizontal and vertical main pipe assembly.

[0007] In another preferred embodiment, the first horizontal and vertical main pipe assembly includes: a first horizontal main pipe and a first vertical main pipe, wherein the dome pipe, the circumferential secondary air duct and the circumferential main air duct are all connected to the first vertical main pipe, the first vertical main pipe is connected to the first horizontal main pipe, and one end of the first horizontal main pipe passes through the upper equipment compartment door of the steel containment vessel.

[0008] In another preferred embodiment, the second horizontal and vertical main pipe assembly includes: a second horizontal main pipe and a second vertical main pipe, both the four-layer pipe and the five-layer pipe are connected to the second vertical main pipe, the second vertical main pipe is connected to the second horizontal main pipe, the first horizontal main pipe and the second horizontal main pipe are arranged parallel to each other, and one end of the second horizontal main pipe passes through the upper equipment compartment door of the steel containment vessel.

[0009] In another preferred embodiment, the system further includes a first fan and a second fan, both of which are disposed outside the steel containment building. One end of the first transverse main pipe is connected to the first fan, and one end of the second transverse main pipe is connected to the second fan.

[0010] In another preferred embodiment, it further includes an air supply unit disposed outside the steel containment building and located near the lower equipment compartment door of the steel containment building.

[0011] In another preferred embodiment, it further includes: an air supply duct, one end of which is connected to the air supply unit, and the other end of which passes through the lower equipment compartment door of the steel containment and extends into the steel containment, the air supply duct being disposed at the lower end of the five-layer pipe.

[0012] The present invention, by adopting the above-mentioned technical solution, has the following positive effects compared with the prior art: By applying the present invention, a temporary ventilation system for installation within a steel containment structure is proposed. Through the setting of an upper exhaust system and a lower exhaust system, it can accurately cover the area requiring ventilation, effectively collect flue gas generated at different heights, thereby reducing the accumulation and residual rate of flue gas within the steel containment structure, improving the air quality of the construction environment, and providing a healthier working environment for workers. Furthermore, by connecting the upper and lower exhaust systems through a first and second vertical main pipe, respectively, and placing the first and second fans outside the steel containment structure, it helps reduce the probability of temporary ventilation items occupying space for formal items, providing more sufficient space for the construction of formal items, improving the space utilization rate of the steel containment structure, and avoiding construction inconvenience and delays caused by space conflicts. Attached Figure Description

[0013] Figure 1This is a schematic diagram of a temporary ventilation system installed inside a steel containment vessel according to the present invention; Figure 2 This is a schematic diagram of the upper exhaust system of a temporary ventilation system installed inside a steel containment vessel according to the present invention; Figure 3 This is a schematic diagram of the lower exhaust system of a temporary ventilation system installed inside a steel containment vessel according to the present invention.

[0014] In the attached image: 1. Steel containment structure; 2. Dome duct; 3. Circumferential secondary duct; 4. Circumferential main duct; 5. Four-layer duct; 6. Five-layer duct; 7. First horizontal main duct; 8. First vertical main duct; 9. Second horizontal main duct; 10. Second vertical main duct; 11. First fan; 12. Second fan; 13. Air supply unit; 14. Air supply duct. Detailed Implementation

[0015] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] In the description of this invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "lateral", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention.

[0017] It should be noted that the terms "horizontal" and "vertical" in this invention are used to describe approximate positional relationships, and not strictly "horizontal plane" or "vertical plane".

[0018] like Figure 1-3 As shown, a temporary ventilation system installed inside a steel containment vessel according to a preferred embodiment is provided. The system is suitable for a steel containment vessel 1 and includes: an upper exhaust system, a lower exhaust system, a first horizontal and vertical main pipe assembly, and a second horizontal and vertical main pipe assembly. Both the upper and lower exhaust systems are installed inside the steel containment vessel 1, with the upper exhaust system located above the lower exhaust system. One end of the first horizontal and vertical main pipe assembly extends into the steel containment vessel 1 and is connected to the upper exhaust system. One end of the second horizontal and vertical main pipe assembly extends into the steel containment vessel 1 and is connected to the second horizontal and vertical pipe assembly.

[0019] Furthermore, in a preferred embodiment, the upper exhaust system includes a dome duct 2, a circumferential secondary duct 3, and a circumferential main duct 4 arranged sequentially from top to bottom. A duct support is provided on the inner wall of the steel containment vessel 1. The dome duct 2, the circumferential secondary duct 3, and the circumferential main duct 4 are all mounted on the duct support and connected to the first horizontal and vertical main duct assembly. Further, the dome duct 2 is used to collect flue gas generated near the dome of the steel containment vessel 1. The circumferential secondary duct 3 can further expand the collection range of flue gas inside the steel containment vessel 1, and can perform secondary collection of flue gas that the dome duct 1 fails to completely collect. The circumferential main duct 4 can concentrate the flue gas collected by the dome duct 1 and the circumferential secondary duct 2 for discharge through the first horizontal and vertical main duct assembly.

[0020] Furthermore, in a preferred embodiment, the lower exhaust system includes a four-layer pipe 5 and a five-layer pipe 6 arranged sequentially from top to bottom, both of which are connected to the second horizontal and vertical main pipe assembly. Further, the four-layer pipe 5 and the five-layer pipe 6 are used to collect flue gas in the lower region inside the steel containment vessel 1. Specifically, the four-layer pipe 5 mainly collects flue gas generated at higher positions in the lower region inside the steel containment vessel 1, while the five-layer pipe 6 focuses on collecting flue gas near the bottom of the steel containment vessel 1.

[0021] Furthermore, as a preferred embodiment, the first horizontal and vertical main pipe assembly includes: a first horizontal main pipe 7 and a first vertical main pipe 8, the dome pipe 2, the circumferential secondary air pipe 3 and the circumferential main air pipe 4 are all connected to the first vertical main pipe 8, the first vertical main pipe 8 is connected to the first horizontal main pipe 7, and one end of the first horizontal main pipe 7 passes through the upper equipment compartment door of the steel containment 1.

[0022] Furthermore, as a preferred embodiment, the second horizontal and vertical main pipe assembly includes: a second horizontal main pipe 9 and a second vertical main pipe 10, both the four-layer pipe 5 and the five-layer pipe 6 are connected to the second vertical main pipe 10, the second vertical main pipe 10 is connected to the second horizontal main pipe 9, the first horizontal main pipe 7 is arranged parallel to the second horizontal main pipe 9, and one end of the second horizontal main pipe 9 passes through the upper equipment compartment door of the steel containment 1.

[0023] Furthermore, as a preferred embodiment, it further includes: a first fan 11 and a second fan 12, both of which are disposed outside the steel containment vessel 1. One end of the first transverse main pipe 7 is connected to the first fan 11, and one end of the second transverse main pipe 9 is connected to the second fan 12. Further, the first fan 11 is used to extract the flue gas collected by the upper exhaust system, and the second fan 12 is used to extract the flue gas collected by the lower exhaust system. When the first fan 11 is activated, the suction force generated by the first fan 11 allows the flue gas in the upper exhaust system to be smoothly discharged outside the steel containment vessel 1 through the first transverse and transverse main pipe assembly. Similarly, the second fan 12 can extract the flue gas collected by the lower exhaust system to ensure an effective negative pressure extraction environment is formed inside the entire steel containment vessel 1.

[0024] Furthermore, as a preferred embodiment, it also includes: an air supply unit 13, which is disposed outside the steel containment 1 and is located near the lower equipment compartment door of the steel containment 1.

[0025] Furthermore, as a preferred embodiment, it also includes: an air supply duct 14, one end of which is connected to the air supply unit 13, and the other end of which passes through the lower equipment compartment door of the steel containment 1 and extends into the steel containment 1. The air supply duct 14 is located at the lower end of the five-layer pipe 6. Furthermore, the air supply unit 13 can supply fresh air into the steel containment 1 through the air supply duct 14. After the fresh air enters the steel containment 1 from the air supply duct 14, it can form an airflow within the steel containment 1, creating convection with the exhaust gas, thereby achieving air circulation and purification within the steel containment 1. This allows the fresh air to be better distributed throughout the various areas of the steel containment 1, while simultaneously ensuring pressure balance within the steel containment 1.

[0026] The working principle of this invention is as follows: During construction inside the steel containment vessel 1, grinding and welding operations at the top of the steel containment vessel 1 generate high-temperature fumes. These fumes, rising naturally, are first captured by the dome pipe 2, which collects most of the rising fumes. Subsequently, the remaining fumes flow to the circumferential secondary ventilation duct 3, which captures any fumes remaining around the dome pipe 2. Finally, the fumes concentrate in the circumferential main ventilation duct 4, which transports the collected fumes to the first vertical main duct 8 connected to it. Fumes generated from grinding and other operations at the bottom of the steel containment vessel 1 are partially collected directly by the five-layer pipe 6, while the remaining fumes diffuse upwards. The flue gas is captured by the four-layer pipe 5. The flue gas collected by the four-layer pipe 5 and the five-layer pipe 6 is then transmitted to the second vertical main pipe 10. The first vertical main pipe 8 receives the flue gas from the upper exhaust system and guides it to the first horizontal main pipe 7. The second vertical main pipe 10 can guide the flue gas from the lower exhaust system to the second horizontal main pipe 9. Then the first fan 11 and the second fan 12 are started. The first fan 11 and the second fan 12 can generate strong suction, forming a negative pressure environment in the first horizontal main pipe 7 and the second horizontal main pipe 9. Under the action of negative pressure, the flue gas in different height areas inside the steel containment 1 can be quickly extracted from the steel containment 1 through their respective horizontal and vertical main pipe components, realizing efficient exhaust function.

[0027] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A temporary ventilation system installed inside a steel containment vessel, suitable for steel containment vessels, characterized in that, include: The enclosure includes an upper exhaust system, a lower exhaust system, a first horizontal and vertical main pipe assembly, and a second horizontal and vertical main pipe assembly. Both the upper and lower exhaust systems are housed within the steel containment building, with the upper exhaust system positioned above the lower exhaust system. One end of the first horizontal and vertical main pipe assembly extends into the steel containment building and connects to the upper exhaust system, while one end of the second horizontal and vertical main pipe assembly extends into the steel containment building and connects to the second horizontal and vertical pipe assembly.

2. The temporary ventilation system installed inside the steel containment vessel according to claim 1, characterized in that, The upper exhaust system includes a dome duct, a circumferential secondary duct, and a circumferential main duct arranged sequentially from top to bottom. A duct support is provided on the inner wall of the steel containment vessel. The dome duct, the circumferential secondary duct, and the circumferential main duct are all installed on the duct support and connected to the first horizontal and vertical main duct assembly.

3. The temporary ventilation system installed inside the steel containment vessel according to claim 2, characterized in that, The lower exhaust system includes a four-layer pipe and a five-layer pipe arranged sequentially from top to bottom, and both the four-layer pipe and the five-layer pipe are connected to the second horizontal and vertical main pipe assembly.

4. The temporary ventilation system installed inside the steel containment vessel according to claim 2, characterized in that, The first horizontal and vertical main pipe assembly includes a first horizontal main pipe and a first vertical main pipe. The dome pipe, the circumferential secondary air duct and the circumferential main air duct are all connected to the first vertical main pipe. The first vertical main pipe is connected to the first horizontal main pipe. One end of the first horizontal main pipe passes through the upper equipment compartment door of the steel containment vessel.

5. The temporary ventilation system installed inside the steel containment vessel according to claim 4, characterized in that, The second horizontal and vertical main pipe assembly includes: a second horizontal main pipe and a second vertical main pipe. The four-layer pipe and the five-layer pipe are both connected to the second vertical main pipe. The second vertical main pipe is connected to the second horizontal main pipe. The first horizontal main pipe and the second horizontal main pipe are arranged parallel to each other. One end of the second horizontal main pipe passes through the upper equipment compartment door of the steel containment vessel.

6. The temporary ventilation system installed inside the steel containment vessel according to claim 5, characterized in that, Also includes: A first fan and a second fan are both located outside the steel containment building. One end of the first transverse main pipe is connected to the first fan, and one end of the second transverse main pipe is connected to the second fan.

7. The temporary ventilation system installed inside the steel containment vessel according to claim 3, characterized in that, Also includes: An air supply unit is disposed outside the steel containment building and is located near the lower equipment compartment door of the steel containment building.

8. The temporary ventilation system installed inside the steel containment vessel according to claim 7, characterized in that, Also includes: An air supply duct, one end of which is connected to the air supply unit, and the other end of which passes through the lower equipment compartment door of the steel containment building and extends into the steel containment building. The air supply duct is located at the lower end of the five-layer pipe.

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