1. Sunshine board. The steel supporting part covered by the solar panel is located between the solar panel and the exhaust gas. The sealing of the solar panel and the rising temperature accelerate the corrosion of the steel supporting part, and the service life is 3-5 years. Even if stainless steel is used, the problem of corrosion cannot be avoided. At the same time, there will be problems of aging and brittleness after 2 years.
2。 Glass fiber reinforced plastic has good corrosion resistance, but the span is not good, generally the maximum span is 8 meters. And the greater the span, the more steel will be invested. Moreover, the steel body will be corroded when it comes into contact with waste gas.
3. Anti-hanging membrane structure. The advantages of anti-hanging membrane structure are anti-hanging and the membrane surface is in contact with corrosive gas. Because the membrane material is chemically stable, it will not be corroded. Moreover, the membrane material itself has good sealing performance, large span and long service life of 15-25 years, which is the most suitable scheme for capping sewage tanks.