How many categories are there generally for steam pressure levels in chemical engineering projects?
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In chemical production projects, how many types are there for steam pressure ratings, and how is the appropriate rating generally determined?
What does a chemical engineering project mean? We have four types here: extra-high voltage, high voltage, medium voltage, and low voltage
1# mjp327 Our refinery uses high-pressure steam at 9.5 Mpa, medium-pressure steam at 3.5 Mpa, low-pressure steam at 1.1 Mpa, and very low-pressure steam at 0.45 Mpa. High-pressure steam is mainly used for the reforming units, the compressors and turbines in the wax oil hydrogenation plants, as well as the extraction-type steam turbine generators in the power stations. Medium-pressure steam is primarily used to drive process turbines and for process heating in various units. Low-pressure steam is mainly used for process heating in various units. Low and low-pressure steam is mainly used in deaerators, process heating for various units, as well as in utility and auxiliary facilities.
The projects I have worked on are generally divided into four categories: ultra-high pressure, high pressure, medium pressure, and low pressure. The different pressure levels are connected to each other through throttle valves and turbines~
High, medium, and low pressure for steam are relative concepts; there is no absolute standard. Different factories or plants may require different steam pressures (or temperatures), so as long as the steam pressure is neither the highest nor the lowest, it can be considered medium-pressure steam. Each case must be analyzed on its own. For example: I have been exposed to two sets of drawings before, one for catalytic processes and the other for atmospheric pressure processes. The catalytic process drawings specified steam at three different pressures, hence they were divided into high, medium, and low pressure levels; whereas the atmospheric pressure process used steam at two pressures, so it was divided into low and high pressure levels. Products from different devices and different design institutes will vary to some extent.
Low pressure, medium pressure, high pressure, critical pressure, supercritical pressure. General chemical plants use low-pressure and low-to-medium pressure steam boilers; if the project is not very large, the local quality inspection authorities will not give approval
H.P. Steam M.P. Steam L.M.P. Steam Pressure, MPaG Temperature, oC Minimum required Condensate Pressure, MPaG Fouling factor, m²K/W The four values that generally need to be provided are the following
In fact, pressure is classified according to pressure levels: high-high, high, medium, and low pressure. The steam used by a company is of the pressure level that falls within its specified range.