[Asia Fluid Network News] Cryogenic pump is mainly the delivery of liquid hydrocarbons, liquefied petroleum gas, liquefied natural gas, liquid oxygen, liquid nitrogen and Other low-temperature liquefied gas vacuum pump equipment. The temperature of these gases is usually -30 --- l96 ℃, understand the characteristics of cryogenic pumps for more efficient use of such products has a very important role. Next mainly introduces the characteristics of low-true pump through three aspects. Cryogenic pump 1. High pressure at the pump inlet Liquefied gas is normally at ambient temperature and atmospheric pressure and becomes liquid only under certain pressure and low temperature conditions. Such as ethylene plant, liquefaction of methane is 3MPa, -l00 ℃; ethylene liquefaction conditions of 2MPa, -30 ℃. 2. Strict requirements on the shaft seal Most liquefied gases are corrosive and dangerous, so do not allow leakage to the outside world; once liquefied gas leak bitch. As the liquefied gas vaporization heat easily lead to the sealing parts of the icing, cryogenic pump delivery of liquefied gas on the shaft seal of the very strict requirements. 3. Vapor pressure changes sharply with temperature Liquefied gases delivered by cryogenic pumps are usually saturated (or with a slight subcooling). The vaporization pressure of this liquid has a very significant temperature change. Generally when the temperature changes ± 25%, the vaporization pressure can change ± (100 0A - 200%), meanwhile the physical properties of the medium such as density, specific heat capacity and latent heat of vaporization will also change. For example, when the temperature rises, the vapor pressure increases sharply, the density decreases, the specific heat capacity increases, the latent heat of vaporization decreases, the liquefied gas is more easily vaporized, and the inlet pressure is increased, which affects the strength of the pump body; Vapor pressure within the tank decreases, but also through the suction tube 蔫, but also easy to absorb heat from the outside heat, which will result in NPSH. Of the decline, the deterioration of inhalation cavitation performance, and therefore must be fully insulated suction pipe cold, so that the suction tank temperature fluctuations do not often. Pipeline at the same time should try not to set spherical lanthanum, throttling, filters and other throttling device, so as not to cause local pressure drop, the liquefied gas vaporization. In summary, the cryogenic pump at work there are many areas of concern, and only a real understanding of its characteristics, the producer can better improve and enhance the product, consumers can better choose the product and use the product. With the development of the vacuum pump speeding up, how to make the cryogenic pump to maintain its own advantages, there is still much work to be done, relevant professionals can pay attention to the relevant data research. Related articles: Sputtering ion pump features getter ion pump features
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