Has anyone ever seen an industrial drive turbine with intermediate steam extraction?
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Has anyone ever seen an industrial drive turbine with intermediate steam extraction? Personally, it is best not to evacuate the turbines used in the process, in order to avoid being affected by the pipeline network and thus prevent fluctuations in the efficiency of the process compressors
I’ve seen it before but haven’t used it; I just treat it as a fully solidified product
Is it that the design doesn’t match actual use at all? Is the pressure in the lower-level pipeline network stabilized by a temperature-reducing pressure regulator?
The steam drawn out from the middle is combined into the pipeline network, and it has no impact on the pressure in the lower-level pipelines
The main purpose of steam extraction is to stabilize the pressure in the pipeline network; if the pressure is low, the amount of steam extracted is increased, and if the pressure is high, it is decreased. If steam extraction is not used to stabilize the lower-level pipeline network, then is it the temperature reduction valve that is used to regulate the stability of the pipeline network?
Poster: Since this is posted in the fertilizer section, I suggest you take a look at those large-scale fertilizer production units that were introduced in China in the early years; all of their CO2 compressors operate using the mechanism you mentioned, and their performance is stable.
When the compressor is stable and the extraction pressure is higher than that of the downstream pipeline network, extraction is enabled to supplement the steam supply in that network and maintain pressure, thereby reducing steam consumption
Large fertilizer production projects all feature such a design; our syngas compressor turbines are designed in this way, as exhaust-condensation type units. In fact, incorporating an exhaust mechanism in the design helps to save energy and reduce consumption, otherwise, if you use valves to reduce pressure, all that energy will be wasted!
Are you a designer from the manufacturer? What concerns me now is whether steam extraction will affect the speed of the steam turbine and the exhaust parameters (in the case of a back-pressure system), thereby impacting the efficiency of the process compressors as well as the pressures in the inlet and exhaust piping networks, all in consideration of the stability of the entire plant’s steam system.
Practice has shown that steam extraction and injection condensing units operate quite stably. The owner’s reasoning makes sense; fluctuations in pipeline pressure can affect the units, but this only occurs when there are significant changes in the system, such as when the unit is started or stopped, or when the steam pressure drops suddenly!
A factory may have several units, but they all share the same medium-pressure steam network. If one of these units stops operating suddenly, could this cause significant fluctuations in the steam network, thereby affecting the operations of the other units? If only normal operation is taken into consideration, pump-type turbines do facilitate balancing minor fluctuations in the pipeline network; however, at present many owners require us to assess whether the various systems can operate smoothly in the event of an accident