Is a steam temperature and pressure reduction device necessary?
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The steam outside the plant has a working pressure of 1.27 MPa and is superheated steam at 287°C; after passing through the temperature and pressure reduction device, it becomes saturated steam at 0.6 MPa and 165°C before being used； Here’s the problem: the property owner doesn’t want to install a temperature and pressure reduction device, as it involves a lot of hassle in terms of subsequent maintenance, requires water to be circulated, and is considered a special type of equipment. I want to get a control valve so that I can reduce the pressure directly. Which one is better? My analysis (for discussion only): If the temperature that needs to be reached through heating is 200°C, then superheated steam is the only option available; using steam for heat exchange at this temperature may not be effective enough. If the heating temperature is around 150°C or so, it’s better to use saturated steam, as it also saves steam. Please have an expert answer this: property owners always seek convenience and therefore use control valves and superheated steam.
Family members generally don’t use superheated steam; instead, they use saturated steam for heating. Therefore, it’s necessary to reduce the temperature, and when the pressure is too high, it needs to be lowered as well. Of course, a temperature and pressure reduction device is required for this
To save energy and reduce consumption, temperature and pressure reduction devices are the best choice.
I would like to ask whether the condensate that fails to be drained from the heat exchanger will be added to the superheated steam that has just entered the equipment
The condensate is at the bottom of the heat exchanger, or even within the outlet piping, while the heating steam inlet is at the top of the heat exchanger; therefore, it is not possible to supply superheated steam.
A temperature and pressure reduction device is still the better choice: first, it saves energy; second, it improves heat exchange efficiency; third, it reduces the design temperature of the heat exchanger, thereby saving on equipment costs; fourth, a temperature and pressure reduction device includes an additional water addition valve and a diffusion tube compared to a separate pressure control valve, which results in only a slight increase in investment, and it requires little maintenance over time.
Isn’t there also condensate on the heat exchanger walls?
Pressure reduction can be designed as a reducing valve or a pressure relief valve； But to reduce the temperature, it is still necessary to add cooling water pipelines; it would be better to include a control valve as well
To reduce the temperature, and also to lower pressure when it is too high, just installing a pressure relief valve is not sufficient.