Around the higher requirements of the power grid in terms of fire prevention and explosion protection, the sealing scheme of the second-generation converter station of Ruixin has made comprehensive innovations in structural design, material selection and construction technology.
1. New structural design
The main structure of the valve chamber hole of the second generation converter station of Ruixin is composed of four parts. The first part is explosion-proof structure. It consists of non-magnetic explosion-proof steel plate and non-magnetized stainless steel square tube keel. It can resist the huge explosion caused by outdoor equipment. Shock. The second part is the fireproof structure. The main part is a metal surface structure composite fireproof board, which meets the fireproof design requirements of more than 4 hours. The third part is the edging fireproof structure, which is covered with stainless steel material and filled with heat-insulating fireproof material inside, which can effectively prevent the fire from extending through the hem. The fourth part is the fireproof sealing structure of the casing of the casing. The layered ceramized silicone rubber and the multi-layered aluminosilicate wool blanket are intercoated to ensure that the fire does not extend to the valve hall.
2. Unique material selection
Explosion-proof materials: The non-magnetic explosion-proof steel plate and the non-magnetized stainless steel square tube keel selected by Ruixin have excellent explosion-proof performance. According to the explosion impact of the explosion-proof structure of the Sichuan Fire Research Institute of the Ministry of Public Security, the impact force of 10 kPa is taken for 10 ms to the explosion-proof structure. The bending deformation of the explosion-proof structure does not exceed 10 mm.
Fireproof material: The fireproof material selected by Ruixin is a metal surface composite fireproof board, and the second is a ceramic silicon rubber material, both of which are self-made materials. The metal surface composite fireproof board can withstand the high temperature of not less than 1000 °C, the fireproof grade reaches A2-s1, d0, t0 grade, the heat insulation effect λ≤0.44w/mk, and the fireproof time is not less than 240 minutes. Shirui ceramic silicon rubber material has the advantages of insulation, fire separation, water isolation, shock resistance, small weight loss, etc. It is converted into inorganic ceramic material when it is exposed to high temperature. In the case of fire, the "ceramic" hard shell can play Very good flame retardant, fireproof, fireproof, fireproof, can withstand 1200 ° C -1500 ℃ high temperature.
Anti-vortex heating material: In the hole sealing structure of Ruixin Valve Hall, the non-magnetic explosion-proof stainless steel material is fully applied. This material belongs to austenitic stainless steel, which can effectively control the eddy current temperature rise and ensure the safe operation of the DC bushing.
3. One-stop sealing service
Ruixin provides a complete set of converter station valve sealing schemes for DC projects, including scheme design, material selection, material production and testing, program construction and inspection maintenance, and provides integrated construction services. Ruixin and the design unit directly docked the design plan, and directly connected the construction plan with the construction unit (electric construction company) and the equipment manufacturing unit, responsible for the overall design, material manufacturing and testing, construction quality and post-checking maintenance, ensuring the entire project can Perfect implementation.