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Design points and application characteristics of steam ejector heating
Release time:
2022-01-18
The steam consumption of the steam ejector is related to the required heat. Unless the steam ejector is designed to ensure high heat exchange efficiency, the steam bubble may break on the liquid surface and disperse to the atmosphere.
In the application of steam ejector heating, gas heat exchanger is generally used for indirect heating, but in these systems, heat is transferred through the heat transfer surface. If in some hot water heating process, the steam ejector will be directly used for heating, and the steam will be directly sprayed on the surface of the low temperature liquid, so as to fully mix the steam with the heated medium. After condensation, it will release heat to the surrounding liquid, thus raising the temperature of the surrounding liquid.
Heat transfer often occurs when the liquid and steam are in direct contact, so at present, the steam ejector heating method can only be used in the case of dilution and fluid mass increase, and the heated fluid is usually water, which is also a relatively wide application in our daily life.
Steam ejector is rarely used in cases where chemical reaction may occur, for example, if the solution is diluted, chemical reaction will occur, which will reduce the performance of the product itself. Steam ejector heating is also not applicable to steam condensate, which will be affected by the heated medium. The whole industrial pillar is widely used in the heating of water tank. The reason why steam ejector is selected for heating is that this equipment has simple structure and heating form, and does not need heat exchange surface or steam trap, and does not need to consider the condensate recovery system, and the overall investment is relatively low.
In the heating of steam heater, the form of heat exchange is very different from that of direct heat exchanger, because the heat is not transferred through the heat exchange surface, and the spray can be directly exchanged with the heated fluid, so the heat available in the steam needs to be calculated in different ways.
The steam ejector utilizes all the potential heat and liquid heat in the steam, so the change of liquid heat often depends on the heating water temperature. The main difference between indirect heating and direct steam ejector heating is that the volume of the process fluid increases, and the increase is the amount of steam injected, The other difference is that the internal steam pressure should be considered when calculating the steam flow inside the steam coil. However, for the steam ejector, the pressure in front of the control valve needs to be considered. In these cases, the steam direct ejector will increase the static pressure of the liquid over time, but this part of the increase is relatively small, which is usually not considered in the calculation process.
The steam consumption of the steam ejector is related to the required heat. Unless the steam ejector is designed to ensure high heat exchange efficiency, the steam bubble may break on the liquid surface and disperse to the atmosphere.
