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Why does the steam temperature rise when the condensing gas boiler is discharged regularly?

2021-07-02 09:34    page view:

Guide: When the condensing gas boiler is discharged regularly, it discharges the boiler water at the saturation temperature under the drum pressure. For example, the saturated water temperature of the medium-pressure furnace is 256°C, and the high-pressure furnace is 317°C. In order to maintain the normal water level, the water supply must be increased. Because the feed water temperature is lower than the furnace water temperature, such as the medium pressure furnace, the high pressure heater is 172°C when it is put into operation, 104°C when it is not put in, and it is 215°C when the high pressure heater of the high pressure furnace is put in, and 168°C when it is not put in.

  When the condensing gas boiler is discharged regularly, it discharges the boiler water at the saturation temperature under the drum pressure. For example, the saturated water temperature of the medium-pressure furnace is 256°C, and the high-pressure furnace is 317°C. In order to maintain the normal water level, the water supply must be increased. Since the feed water temperature is lower than that of the furnace water, such as a medium pressure furnace, the high pressure heater is 172°C when it is in operation, 104°C when it is not turned on, and it is 215°C when the high pressure heater is turned in, and 168°C when it is not.

Condensing gas boiler

  During the periodical blowdown of the condensing gas boiler, the boiler water that reaches the saturation temperature is discharged, and the feedwater of lower temperature is supplemented. In order to maintain the evaporation rate unchanged, it is necessary to increase the amount of fuel, the flue gas temperature and flue gas flow rate at the outlet of the furnace increase, and the steam temperature rises. If the amount of fuel does not change, because part of the fuel is used to increase the temperature of the feed water, the heat used for vaporization to produce steam is reduced, and the amount of steam is reduced, and the flue gas temperature and flue gas flow rate at the outlet of the furnace remain unchanged, so the steam temperature rises.

  The lower the feed water temperature, the greater the increase in steam temperature caused by the regular blowdown of the condensing gas boiler. If you pay attention to the steam temperature record table, you can clearly see the rise in steam temperature when the regular blowdown is completed. After the regular blowdown, The steam temperature is restored to its original level.

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