Bioenergy purification

The expansion air volume entering the upper tower increases, and the reflux ratio of the distillation section decreases correspondingly. In order to achieve the required purity of nitrogen products, more tower plates need to be set. When the reflux ratio is reduced to countless Tower plates needed to be set to make the purity of nitrogen reach the required value, then the reflux ratio is called the minimum reflux ratio. The expansion air volume entering the upper tower is first limited by the minimum reflux ratio. The closer the reflux ratio is to the minimum reflux ratio, the faster the number of tower plates needed to ensure the product purity increases, which will lead to the increase of investment, the increase of tower plate resistance, the increase of Operation pressure and the increase of energy consumption. Therefore, the reflux ratio after the inflated air enters the tower should be larger than the minimum reflux ratio. When the purity of nitrogen is required to be low, the...

Phase cooling method is one of the start-up operating force methods of the air separation plant which uses switching heat exchanger to self-remove moisture and carbon dioxide. In the full low pressure air separation plant, under the operating pressure of 0.5MPa (surface pressure), the moisture content is-40 ~ -60℃ has been basically frozen. However, carbon dioxide will not be precipitated and frozen until it is below-133 ℃ until-165 ~ -170℃ frozen. Thus, the range from-60℃ to-133 ℃ is dry zone. Using this principle, the cooling process of the equipment during the start-up operation is carried out in stages, which is the stage cooling method. The whole cooling process is divided into four stages: the first stage is the stage of moisture precipitation and freezing. In this stage, only the switching heat exchanger is first cooled until the temperature at the cold end reaches-60℃; the second stage is drying stage, and the available water has been cleared, while for the machine which has...