For the same heat transfer area, the number of long tubes is less than that of short tubes, which can reduce the diameter of condensing evaporator. In addition, due to the evaporation in the tube, bubbles are produced in the evaporation, which has strong interference on the flow and large heat transfer coefficient.

For the same heat transfer area of air separation equipment, the number of long tubes is less than that of short tubes, which can reduce the diameter of condensing evaporator. Moreover, due to the evaporation in the tube, bubbles constantly occur in the evaporation process, the flow interference is intense, the heat transfer coefficient is large, about 800 w / (M2 ℃), and the consumption of metal materials can be reduced. The heat transfer of air separation equipment manufacturer is directly proportional to the heat transfer temperature difference. The temperature difference between the surrounding air and the inside of the device increases, and the cooling loss increases. Therefore, the cooling loss in summer is greater than that in winter, and that in day is greater than that in night. When the gas of the air separation plant manufacturer expands in the expander, only the enthalpy drop caused by external operation is considered in calculating the refrigeration capacity of the expander. In fact, when the pressure decreases, the molecular potential energy also increases, so a part of throttling effect must be produced. This part of the refrigerating capacity is not calculated separately, but according to the total enthalpy difference between the low pressure gas and the pressure gas entering the device, it represents the total throttling effect refrigerating capacity of the device. When adjusting the refrigerating capacity of the expander, it does not affect the refrigerating capacity of throttling effect.

When the cold end temperature of the air separator reaches - 10 ℃, circulating current is used. Using circulating current in advance can not only reduce the temperature difference at the cold end, ensure self cleaning, but also make the switching heat exchanger cool evenly. When the staged cooling method is adopted for start-up, the use of circulating current as early as possible can also prolong the working time of the expander under the condition of higher inlet temperature, which can give full play to the characteristics of large refrigeration capacity of the turbo expander under high temperature, thus shortening the start-up time. When the screen hole is partially blocked by scale and dirt, the air flow rate increases, and when it exceeds a certain flow rate, the air will carry water; The injection hole of circulating cooling water distributor is blocked. At this time, it is difficult for the cooling water to flow downward, and the water accumulates on the upper tray, causing the liquid flooding and carrying water;

The working temperature difference of condensing evaporator of air separation equipment is related to its heat transfer mechanism. For example, condensation inside or outside the tube, or condensation in the tank; Whether it is boiling inside or outside the tube, or boiling in the tank; Is it vertical or horizontal. Expander cooling capacity of air separation equipment manufacturer. When the gas with higher pressure expands through the expander, the energy (enthalpy) of the gas itself is reduced and the temperature is significantly reduced because the gas drives the impeller to rotate and output. Its ability to take away heat is to recover the energy before expansion after absorbing heat. Therefore, the difference of energy (enthalpy) before and after expansion is the cooling capacity of expander.

Because of the increase of the cooling capacity of the circulating flow, the cooling capacity of the return gas in the cooling section decreases correspondingly, the temperature of the return gas at the hot end decreases, and the temperature difference at the hot end increases. The temperature of the positive and return gas in the middle decreases, but because the amount of the return gas in the hot section does not increase, the temperature drop of the air in the middle is smaller than that of the return gas, so the temperature difference between the positive and return gas in the middle increases. The acetylene content in the liquid air and liquid oxygen of the air separation plant manufacturer needs to be analyzed every day, so the liquid air and liquid oxygen discharge valves must be operated every day. It's very easy to open the valve often. It's very difficult to close it. Sometimes it can't be closed at all. This is mainly because there is water in the valve filler letter.