Fujian Province, referred to as "Min", with its capital Fuzhou, is located in the southeast coast of China, facing Taiwan across the Taiwan Strait in the east. Most of the province belongs to the Middle subtropical zone, and some parts of southeastern Fujian belong to the south subtropical zone. The total land area of the province is 124,000 square kilometers, and the sea area is 136,000 square kilometers. Fujian is dominated by erosion coast. The area of the tidal flats in the intertidal zone is about 200,000 hectares, and the bottom material is mainly mud, sediment or sand mud.

In recent years, Fujian's economy has developed rapidly, and many enterprises need to use nitrogen, so the demand for nitrogen machines is great.

Nitrogen machines are used in different industries, and the purity requirements for nitrogen are also different.

Used in the electronics industry, purity requirements: 99.99%~99.9995%, LED can only need to purity: 99.9%

Used in the chemical industry, purity requirements: 95%~99.99% (such as reactor nitrogen machine)

Used in the food industry, purity requirements: 95%~99.999%

Used in metal heat treatment industry, purity requirements: 99.99%

Used in sintering furnace industry, purity requirements: 99.99%

Used in laser cutting industry, purity requirements: 99.99%

Used in stainless steel pipe industry, purity requirements: 99.99%