Super-long GIL pipe gallery SF6 discharge system
By designing a main channel, emergency exhaust duct, SF6 gas collection tank, and multi-stage fan system in an ultra-long GIL pipe gallery, the problem of SF6 gas being difficult to remove in ultra-long pipe galleries has been solved, achieving rapid and safe gas removal and improved system efficiency.
Patent Information
- Application Number
- CN202520205320.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-02-10
AI Technical Summary
In ultra-long GIL (Gas Intake Line) tunnels, SF6 gas leaks are difficult to effectively eliminate, leading to gas accumulation, local oxygen deficiency, and safety hazards. Traditional exhaust systems have excessive pressure heads and large air leakage, making it difficult to effectively meet the exhaust needs of ultra-long tunnels.
A GIL (Gas Intake System) SF6 emission system was designed, including a main channel, emergency exhaust duct, SF6 gas collection tank, SF6 shaft, electric air valve, isolation wall, and multi-stage fans. By accurately locating the leak point and sectionalizing the exhaust, the fan head is reduced, the leakage volume is decreased, and rapid and effective gas removal is ensured.
It enables rapid and safe removal of SF6 gas from ultra-long GIL pipe corridors, reduces the pressure head requirement of the exhaust system, reduces air leakage, and improves safety and exhaust efficiency.
Smart Images
Figure CN223869390U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of toxic gas emission technology in the power industry, and is particularly applicable to an ultra-long GIL (Gas Inlet and Outer Limit) SF6 emission system. Background Technology
[0002] Pure sulfur hexafluoride (SF6) gas is colorless, odorless, tasteless, and non-flammable. It is chemically stable at room temperature and is an inert gas. SF6 is widely used in the power industry as an insulating and arc-quenching medium, and gas-insulated pipelines (GILs) filled with large amounts of SF6 are an important method of power transmission. With rapid urbanization, GIL tunnels are becoming increasingly common. These tunnels typically contain multiple GIL pipes. In the event of an SF6 gas leak, the extremely slow airflow causes toxic decomposition products to accumulate within the tunnel, posing a significant danger to personnel entering the tunnel. Furthermore, because SF6 is denser than air, a leak will cause it to accumulate in lower levels, leading to localized oxygen deficiency and potentially causing asphyxiation. Therefore, the ventilation system of GIL (Gas Infrared) tunnels must be designed to account for SF6 leaks. The conventional approach is to increase the airflow and pressure of the ventilation system to quickly remove SF6 gas. However, due to the high density of SF6, it accumulates at the bottom, making removal difficult. Furthermore, sharing a ventilation system for both SF6 leaks and regular work areas can easily lead to SF6 diffusion, endangering worker safety. For extremely long GIL tunnels, there is a problem of excessive exhaust fan pressure head in SF6 emergencies. Currently, the longest GIL tunnel in China is 5000m. If a GIL tunnel reaches 30000m in length, the exhaust fan pressure head would exceed 10000Pa using traditional exhaust methods. Additionally, excessively long GIL tunnels result in significant air leakage, leading to poor ventilation system performance.
[0003] Therefore, it is necessary to develop a new and innovative exhaust system adapted to ultra-long GIL (Gas Inlet and Outer Limit) tunnels to solve the above problems. Utility Model Content
[0004] The purpose of this invention is to overcome the above-mentioned defects and provide an SF6 emission system for ultra-long GIL (Gas Insulated Linear Inlet) pipe corridors. This system can solve the problem of SF6 emergency ventilation in ultra-long GIL pipe corridors.
[0005] This utility model provides a GIL (Gas Injection Line) SF6 emission system, characterized in that: the GIL SF6 emission system includes a main tunnel, a main channel, an emergency exhaust duct, other functional compartments, GIL pipes, SF6 gas, an SF6 gas collection tank, floor-mounted grille vents, SF6 gas detectors, SF6 shafts, electric air valves, isolation walls, through-hole walls, and fans. The main channel is located at the top of the main tunnel, the emergency exhaust duct is located at the bottom of the main tunnel, the other functional compartments are located in the area between the main channel and the emergency exhaust duct, the GIL pipes are installed in the main channel, the SF6 gas is filled into the GIL pipes, and the SF6 gas collection tank is located at the bottom width of the main channel. The gas troughs are evenly distributed along the length of the main channel, with a quantity of 2N. The floor-type grille vents are located above the SF6 gas collection troughs. The SF6 gas detectors are located above the floor-type grille vents, with two SF6 gas detectors located above each floor-type grille vent. The SF6 shaft is located at the bottom of the SF6 gas collection trough and is connected to the emergency exhaust duct. The electric air valve is located in the SF6 shaft. The isolation wall is located in the middle of the emergency exhaust duct, with a quantity of 1 isolation wall. The perforated wall is located inside the emergency exhaust duct, with N perforated walls located on the left and right sides of the isolation wall in the emergency exhaust duct. The perforated walls are spaced apart from the SF6 shafts. The fans are located on the perforated walls, with a quantity of 2N fans. The leftmost and rightmost sides of the emergency exhaust duct are connected to the atmosphere.
[0006] The advantages of this invention are as follows: When SF6 leaks in the GIL pipeline, it settles to the lower part of the main channel. The SF6 gas collection tank is located at the lower part of the main channel, facilitating the removal of SF6 gas. Each floor-mounted grille vent above the SF6 gas collection tank is equipped with two SF6 detectors, facilitating precise location of the nearest SF6 exhaust port to the SF6 gas leak point. Each SF6 shaft is equipped with an electric air valve, which can precisely control the exhaust position and prevent incomplete or diffused SF6 gas removal. The isolation wall divides the emergency exhaust duct into two sections. When the SF6 gas leak is in the left half of the pipe gallery, it can be directly discharged through the left half of the emergency exhaust duct. When the SF6 gas leak is in the right half of the pipe gallery, it can be directly discharged through the right half of the emergency exhaust duct, effectively ensuring that any SF6 gas leaking from any location can be discharged to the atmosphere through the shortest distance. This solution uses multi-stage fans in series, which can reduce the pressure head of a single fan, resulting in low pressure in the emergency exhaust duct and small system leakage. Attached Figure Description
[0007] Figure 1 This is a side view of the structure of this utility model.
[0008] Figure 2This is a front view schematic diagram of the structure of this utility model.
[0009] Figure 3 This is a top view of the structure of this utility model.
[0010] The corresponding technical features are marked as follows in the attached diagram:
[0011] 1-Pipe gallery main body, 2-Main passage, 3-Emergency exhaust duct, 4-Other functional compartments, 5-GIL pipeline, 6-SF6 gas, 7-SF6 gas collection tank, 8-Floor-mounted grille vent, 9-SF6 gas detector, 10-SF6 shaft, 11-Electric damper, 12-Isolation wall, 13-Through-hole wall, 14-Fan Detailed Implementation
[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0013] like Figure 1 , Figure 2 or Figure 3 As shown, in implementing this utility model, the construction of the main body (1) of the pipe gallery is completed first, and the main body (1) of the pipe gallery is divided into the main channel (2), the emergency exhaust duct (3), and other functional compartments (4). When dividing the main channel (2), the emergency exhaust duct (3), and other functional compartments (4), the construction of the SF6 gas collection tank (7), the SF6 shaft (10), the isolation wall (12), and the through-hole wall (13) is completed simultaneously. A floor-mounted grille vent (8) is installed in the SF6 gas collection tank (7), an SF6 gas detector (9) is installed on the floor-mounted grille vent (8), an electric air valve (11) is installed in the SF6 shaft (10), a fan (14) is installed on the through-hole wall (13), a GIL pipe (5) is installed in the main channel (2), and then SF6 gas (6) is injected into the GIL pipe (5). The installation is then completed. This GIL pipe gallery SF6 emission system is conducive to the rapid discharge of SF6 gas and can also effectively reduce the air leakage of the system.
Claims
1. An SF6 emission system for an ultra-long GIL (Gas-Insulated Linear Irrigation) tunnel, comprising a tunnel body, a main channel, an emergency exhaust duct, other functional compartments, GIL pipes, SF6 gas, SF6 gas collection troughs, floor-mounted grille vents, SF6 gas detectors, SF6 shafts, electric air valves, isolation walls, through-hole walls, and fans. The main channel is located at the top of the tunnel body, the emergency exhaust duct is located at the bottom of the tunnel body, the other functional compartments are located in the area between the main channel and the emergency exhaust duct within the tunnel body, the GIL pipes are installed in the main channel, the SF6 gas is filled into the GIL pipes, and the SF6 gas collection troughs are arranged along the width of the bottom of the main channel and are evenly distributed along the length of the main channel. The quantity is 2N. The floor-mounted grille vents are located above the SF6 gas collection tank. The SF6 gas detectors are located above the floor-mounted grille vents, and two SF6 gas detectors are located above each floor-mounted grille vent. The SF6 shaft is located at the bottom of the SF6 gas collection tank and is connected to the emergency exhaust duct. The electric air valve is located in the SF6 shaft. The isolation wall is located in the middle of the emergency exhaust duct, and the number of isolation walls is 1. The perforated wall is located in the emergency exhaust duct. N perforated walls are located in the emergency exhaust duct on the left and right sides of the isolation wall. The perforated walls are spaced apart from the SF6 shaft. The fans are located on the perforated wall, and the number of fans is 2N. The leftmost and rightmost sides of the emergency exhaust duct are connected to the atmosphere.