Someone who is involved in the preliminary work for turbine construction, please take a look
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When selecting and configuring equipment, if an air-cooled vaporizer is used, are the data such as the design ambient temperature, exhaust pressure, exhaust temperature, and exhaust enthalpy provided by the design institute?
The design ambient temperature is provided by the user; the exhaust pressure and temperature are determined based on the user’s steam network conditions, while the exhaust enthalpy value is calculated by the design institute using relevant data.
Thank you for your support! ““The exhaust pressure and temperature are determined based on the conditions of the steam pipeline network at the user’s site” – this probably refers to the inlet steam pressure and temperature!
The design ambient temperature is the average temperature over several years in the region where the unit will be used, including the maximum and minimum values
For fully condensed steam turbines, the exhaust parameters are provided by the equipment manufacturer
For fully condensed steam turbines, the exhaust parameters are provided by the equipment manufacturer
If an air cooler is used, it is recommended to set the maximum ambient temperature higher. Otherwise, the summer can be quite pleasant. It’s necessary to pre-estimate a part of the process. Only in this way can the summer proceed smoothly.
Choosing a high setting also doesn’t yield good results; this is a pseudo-shortcoming of air coolers: they provide excessive cooling in winter and insufficient cooling in summer. We have designed our maximum operating temperature at 38 degrees Celsius, but when the ambient temperature exceeds 27 degrees, it operates at full speed; the vacuum breakdown is severe, with the pressure rising from 23 to 35 kPa
In winter, anti-freezing measures are necessary, such as the ability of the fan on the counterflow side to reverse direction. Install louvers on the top of the fins or increase dispersion (similar to the insulation method used in greenhouses in winter). If it’s too small, summer is really tough. We also need to consider the repair of frozen fins; it shouldn’t be several layers higher. Leaks and freezing damage make repairs quite troublesome.
Taking the average temperature doesn’t seem very scientific to me; in summer, the temperature can exceed 40 degrees, while the annual average might be around 10 degrees. Based on this average, the operating pressure during summer would be too high. The 6,000-hour method used in power plants seems more scientific – as long as I can operate at full capacity for 6,000 hours per year, that’s sufficient. Chemical companies could adopt an 8,000-hour standard! ;P
It’s better to choose a higher value, but not to an extreme extent; this requires optimization through the efforts of various parties, with the owner’s preferences being the key factor, of course!