As a condenser manufacturer, Ruicheng Machinery will talk to you today about how to deal with the problems encountered when using condensers.
First, let's talk about what to do if the condensate is too cold.
Turbine exhaust steam condenses under saturated pressure. The temperature of the condensate should be equal to the saturation temperature at that pressure, and it should also be equal to the exhaust temperature. Sometimes the temperature of the condensate is lower than the saturation temperature, resulting in supercooling, so that the heat of the condensate is circulated by the water. Take away and reduce economics. In addition, supercooling will increase the oxygen content of the condensate and affect pipeline corrosion. Or the condensate temperature of some units is slightly higher than the saturation temperature at this pressure. The slight "overheating" is mainly due to the high temperature of the heater or the water collecting tank, which is drained back into the hot water well of the condenser and is not cooled by the circulating water, which causes the condensation. As the water temperature rises, the condensate will not vaporize due to the influence of the static pressure of the water level of the hot water well at a certain height.
An increase in subcooling occurs during operation. If the water level of the condenser is normal, an air tightness test can be performed to check that the air extractor works normally. Due to the accumulation of air in the condenser, it not only affects the formation of an air film on the surface of the copper tube and reduces heat transfer. Effect, the end difference rises, and as the air component in the steam-air mixture in the condenser increases, the partial pressure of the steam relative to the total pressure of the mixture decreases, and this air-vapor mixture with less steam content will condense at a lower temperature Increase subcooling.
Another problem is the water level of the condenser. The rise of the water level of the condenser should be analyzed with reference to the meter of the condensate water, the current of the condensate pump, the pressure of the condensate water, and the conductivity. If the flow of the condensate drops, it indicates that the condenser pump has failed or the output is insufficient. The increase of the current indicates that the condensate pump is too late to draw water due to the large amount of condensate water. You should check the reason for the increase in the amount of condensate pump. If the current of the pump and the pressure and flow of the condensate drop or slosh, the water loss due to leaking air is generally explained. The condenser water level rises, the condensate temperature drops, the condenser subcooling increases, and it affects the economic decline. The condensate temperature is an important basis for checking the degree of condenser water level rise. The water level of the condenser rises too much, and a large number of copper pipes are immersed, which affects the rapid drop in vacuum. The condenser water level is too low, which may cause cavitation of the condensate pump.
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