The heat transfer process of fluid passing through the wall is a complex process, and there are many factors affecting the heat transfer. The experimental results show that the hourly heat transfer Q (also known as heat load) is directly proportional to the temperature difference △ t (℃) between cold and hot fluids, and is directly proportional to the size of heat transfer area f (M2). The formula is q = 3600kf △ t (kJ / h).DEAR Biogas purification unit.Since the subcooler and liquefier can fully recover the cooling capacity of the expansion air, it is unnecessary to send air to the upper tower too early. When the main cooling liquid area is enough, the normal distillation condition is established, it is appropriate to stop one expander and then send gas to the upper tower.DEAR Biogas purification unit.Water is sprayed from the top of the tower to contact and mix with the air to cool the air. A plurality of cross flow sieve plates or fillers are arranged in the air cooling tower to increase the gas-liquid contact area. In order to separate the water, a water capture layer is set on the top of the tower. When the air flow rate in the air cooling tower is too fast, the water carrying or spraying amount is too much, and the water level automatic regulation fails, the water inflow accident of Molecular Sieve Purifier will occur.
DEAR Biogas purification unit.Compared with gas leakage, liquid leakage is more harmful, because its unit cooling capacity is twice as large as that of gas at the same temperature, and the density of liquid is hundreds of times of that of gas. Taking liquid oxygen as an example, if the leakage occurs at the speed of 1l / min, the increased cooling loss is 27200kj / h = 7.6kw, and the expansion of 600m3 / h is needed to make up for it. In fact, the equipment can not work normally. Therefore, the leakage of liquid pipeline is absolutely not allowed.The whole argon rich region of distillation section contains oxygen, argon and nitrogen, while the argon rich region of stripping section contains oxygen, argon and nitrogen in the upper part and only oxygen and argon in the lower part. In argon production, it is advantageous to locate the argon rich region of the stripping section at the outlet of the argon fraction.When the water level is higher than the air inlet pipe, the water will be washed to the top of the tower by the air flow, and a large amount of water will be brought into the molecular sieve adsorber or the air separation tower. In addition, when the pressure of the air separation system drops suddenly (such as the forced valve and automatic valve are not closed tightly), the air flow through the spray cooling tower increases sharply.
Oxygen blowing in EAF steelmaking can accelerate the melting of burden and oxidation of impurities, save power consumption, and gradually become a fixed oxygen user. Oxygen enriched blast in blast furnace ironmaking can increase pulverized coal injection, save coke and reduce fuel ratio. Although the purity of rich oxygen is not high (oxygen content is 24% - 25%), the oxygen consumption is considerable due to the large amount of blast, which is close to one third of the oxygen used in steelmaking. Therefore, it has also become a major oxygen user.DEAR Biogas purification unit.After these working fluids are compressed in gaseous state, heat can be released in the condenser at room temperature to condense into liquid. Then the saturation temperature is reduced to a lower temperature than the ambient temperature by throttling expansion. It can cool other substances (air, water, food, etc.) by evaporating and absorbing heat in the evaporator to achieve the purpose of refrigeration. The working fluid itself is heated and vaporized in the evaporator, and then returned to the compressor for further compression.
