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This post was last edited by aaa76555 on 2015-6-23 08:27
It is feasible to raise the temperature to around 240° after heating. At 3.8 Mpa, the saturation temperature of steam at 430° is only 249 degrees; to raise the temperature to 320°, it is necessary to use the sensible heat of the steam. If there is a place to utilize the steam that is released, that’s fine, but if there is no such place, a significant amount of steam is wasted.
The nitrogen heating temperature we are aiming for is around 350°. What’s your QQ number? Could we discuss this in a private message?
Nitrogen is used during operation; it only needs to be heated for over 40 hours. Our steam is superheated steam at 3.8 Mpa and 430°. Can the nitrogen be heated to above 320° using a heat exchanger? What type of heat exchanger is used? What is the area of the heat exchanger?
I think it’s feasible. This is the method for heating molecular sieves after washing with liquid nitrogen
Firstly, the nitrogen temperature requirement can be met, but there must be enough water vapor to prevent phase change of the water vapor. However, this results in low utilization of water vapor, high energy consumption, and since the heat exchanger operates in a gas-gas heat exchange mode, the equipment is also large in size. Given the factors of pressure and gas volume, this heat exchanger is either plain-tube or finned (even for nitrogen at relatively low pressures of 0.7 MPA, it is recommended to use internally expanding fins). If the initial consideration was that using only electric heating would result in excessive costs, then a combination of steam heating and electric heating in series could be considered, which would help to save some costs.
Why is nitrogen at such a high temperature used? Is it used at the start of production? If so, why not use a heating furnace? If not, it is better not to use steam at such a high temperature from the start; the heat balance can be optimized by heating in stages – first using the heat exchange capabilities of the process equipment for heating, and only if that does not yield the desired temperature should superheated steam be used to reach it.
Do you need to heat the nitrogen used for driving?
This results in low heat exchange efficiency; it is recommended to heat the nitrogen with steam to the temperature of saturated steam at 3.8 Mpa, and then use an electric heater for further heating.
This post was last edited by aaa76555 on 2015-6-23 08:26. Hello, our factory is the one that initially started operating