What is the optimal exhaust backpressure for a steam turbine?
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What is the optimal exhaust backpressure for a steam turbine?
There is no best option for this; it is determined during the unit design.
Both high and low back pressure affect the work output of a turbine; for back-pressure turbines, steam temperature is the most critical factor.
5 kilograms in my workshop! It must not be less than 3.5 kilograms; otherwise, the impact on the final stage impeller will be significant, leading to easy damage to the rotor
The optimal exhaust back pressure for the turbines designed today is 1.3 Mpa.
In actual production, the value is not that high. The so-called optimal back pressure refers to the pressure at which the turbine consumes the least amount of steam to produce the same amount of work; either too high or too low a steam pressure is not desirable. It is therefore necessary to find an optimal back pressure in order to save energy and reduce consumption
My state-owned enterprise unit shuts down due to a backpressure of 0.7. However, in our factory’s differential pressure control system, the difference between medium pressure and low pressure is generally kept at 2.4 Mpa.
The main issue with using backpressure steam is its compatibility with low-pressure steam networks.
Our system uses 3.5 MPA of medium-pressure steam as input, with 1.0 MPA of low-pressure steam as output; this 1.0 MPA steam is then sent to the boundary area, where it is used to drive the turbine in the lubricating oil station. (The small turbine also operates under backpressure, with an input of 1.0 MPA and an output of 0.3 MPA.) Another set of turbines uses 1.0 MPA steam as input and are of the condensing type, which helps to reduce energy consumption and make better use of resources
The back pressure of the turbine is determined during the machine’s design; reducing the back pressure can increase the turbine’s load to a certain extent, but this is not recommended. It is best to follow this parameter of the machine; too high or too low back pressure is not good.
We are 0.8-1. 2 Mpa; during normal production, it’s usually around 0.7. It’s best to keep it at the lower limit, as this helps significantly reduce energy consumption.