Thermal power plants
The low-pressure heater of steam engine 9 is generally arranged in the throat of -1 and -2 condensers, and two low-plus public condensate bypass systems. The shaft seal heater outlet is equipped with a condensate recirculation pipe. 9. The inlet pipeline of the low-pressure heater is equipped with the main regulating door and the auxiliary regulating door of the deaerator, and the bypass electric door to adjust the water level of the deaerator. 8. The condensate pipeline of the low and low temperature economizer of the boiler is provided with a branch pipeline to go to the boiler, and the condensate heated by the low and low temperature economizer returns to the condensate pipeline of the 7 low refueling port.
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In view of the 9 low-plus arrangement, it is generally arranged up and down, and at the same time, a part of the low-pressure heater is exposed, that is, only a part is inside the condenser, and this system layout is mainly arranged in combination with the condenser throat, 9. The heat exchange area of the low-pressure heater is about 1200 square meters, and the volume is still very large, if all are put into the condenser, it will occupy a large number of condenser space, and the volume of the condenser throat has to be increased, so the centerline position of the throat of the condenser of the steam engine is combined, 9. The low-pressure heater is arranged in this way.
The throat of the condenser is used as the channel for the exhaust steam to enter the condenser, and the 9 low-pressure heater is arranged here, on the one hand, the exhaust steam can make full use of the exhaust steam waste heat, and on the other hand, the low-pressure cylinder exhaust steam belongs to the saturated steam nature, and it is easy to condense into water, so the drain pipeline can be arranged more conveniently. Due to the low pressure here, no pneumatic backstop or electric shut-off door was installed on the extraction pipe.
But there is another exception, when the 1000MW steam turbine only uses 8 low-pressure heaters, 8 low-pressure heaters are symmetrically arranged left and right, and it is a whole, and some units are all put into the inside of the steam turbine condenser, which is mainly to consider the capacity of the condenser throat, that is to say, the specific leakage of the low-pressure heater depends on the capacity of our condenser throat.
With the increase of unit capacity, more and more low-pressure heaters, the on-site layout will occupy a lot of plant space, how to reasonably arrange the low addition, save space, is also a problem that should be considered in the design of steam turbines.