| Abstrakt: |
On the example of the T-100-12.8 turbine, it is shown that its efficiency in winter (with a fully closed diaphragm) is significantly influenced by the state of the vacuum system and ejectors. An analysis of the effect of the vacuum in the condenser on the efficiency of the cogeneration turbine with a completely closed cogeneration diaphragm and the operation of the turbine according to the thermal schedule when the steam flow rate in the low-pressure part does not exceed 60 t/h is presented. In this case, the pressure in the condenser depends on the tightness of the turbine vacuum system, the state of the ejectors, and the water temperature at the inlet to the condenser and is determined by the characteristics of the ejector. With a completely closed cogeneration diaphragm, the pressure in the condenser does not depend on the steam and circulating water consumption nor, within certain limits, on the state of the heat exchange surface (tube fouling). The change in the turbine capacity in modes with a fully closed diaphragm depends on the deviation of the condenser vacuum from the standard value nonlinearly. At low steam pressure (low temperature of the circulating water at the inlet to the condenser), the power change is more significant than at increased pressure. Power losses increase with an increase in the steam pressure in the lower heating extraction, a decrease in the temperature of the circulating water, and an increase in air inleakage into the condenser. With the diaphragm fully closed, the standard pressure in the condenser is maintained by one ejector if the air inleakage does not exceed the standard value of 15 kg/h. When two ejectors are switched on, the standard vacuum in the condenser in this case can be maintained if the air inleakage is less than 25 kg/h. When the steam consumption in the LPP is more than 80 t/h, the change in the turbine power becomes proportional to the change in the steam pressure in the condenser. [ABSTRACT FROM AUTHOR] |
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