The common phenomenon is that the purity of main cooling gas oxygen and liquid oxygen is quite different, and the concentration of gas phase is lower than that of liquid oxygen. For example, the concentration of liquid oxygen and gas oxygen in a factory was 99% and 96%, respectively. As a result, seven main cooling pipes were found leaking during maintenance.The typical adsorption temperature of Molecular Sieve Purifier generally, as long as the air precooling system is normal, the temperature of air entering the purifier will not change, and the temperature curve is basically a horizontal straight line. The temperature of the air out of the adsorber is slightly higher than the inlet temperature due to the influence of adsorption heat release, and it is approximately a straight line most of the time.DEAR Air separation unit.The water and carbon dioxide in the main heat exchanger are frozen. The temperature difference at the hot end increases obviously, the cooling capacity of the air separation unit is insufficient, and the expansion air volume needs to be increased. Pay special attention to this situation when the moisture and carbon dioxide detection instruments fail.
For pure matter, there is no essential difference between evaporation and boiling. Boiling point is also called "evaporation temperature". When the liquid sealed in the constant pressure container is heated, the temperature T of the liquid is lower than the boiling point ts, and it is all in the liquid state, which is called supercooled liquid;DEAR Air separation unit.Nonferrous metal smelting. Pyrometallurgy is the most important method in heavy metal smelting. In addition to sulfur and iron oxidation, it also depends on fuel combustion to provide heat. In order to strengthen the smelting process, reduce energy consumption and harmful flue gas, oxygen enrichment instead of air is used for smelting, and the production capacity of the equipment can be improved.The cooling capacity of liquid product is equivalent to the heat that needs to be released from ambient temperature to liquefying temperature until it becomes saturated liquid, and its value is quite large. For example, under the pressure of 0.1MPa, the cooling capacity of saturated liquid oxygen is 407kj / kg, and that of saturated liquid nitrogen is 435kj / kg. The cooling capacity per liter of liquid is 465kj / L for liquid oxygen and 353kj / L for liquid nitrogen.
Platinum plating on activated alumina. The catalyst can directly hydrogenate oxygen to water at room temperature and raise the temperature to 130-400 ℃. The oxygen content is less than 0.5 × 10 ~ (- 6) and no additional heat source is needed. But it's expensive.DEAR Air separation unit.In the installation, there should be a firm support at the valve to prevent the valve from bending the valve stem with the displacement of the pipeline. The valve and the cold box can be fixed by elastic connection to prevent the valve rod from being deformed and not concentric with the valve body; during the naked cold period, the valve installation should be checked and adjusted in the cold state.The heat transfer coefficient K increases with the increase of fluid velocity. However, increasing the flow rate will increase the flow resistance and increase the energy consumption of conveying fluid, so we can not unilaterally emphasize increasing the flow rate. The strength of heat conduction through the wall is not only related to the material and thickness of the wall, but also related to the pollution of the wall.
