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What is the main reason for the change of steam temperature during boiler operation?

2020-07-22 16:29    page view:

Guide: The effect of combustion on steam temperature. The change of combustion conditions in the furnace directly affects the change of the heat absorption share of each heating surface. For example, the switching on and off of the upper row of burners, the changes in fuel quality and properties, the size of excess air coefficient, the changes in air distribution mode and flame center, etc., all have a great impact on the increase or decrease of steam temperature;

★ The effect of combustion on steam temperature.

  The change of combustion conditions in the furnace directly affects the change of the heat absorption share of each heating surface. For example, the switch-on and stop of the upper row of burners, the changes in fuel quality and properties, the size of excess air coefficient, the changes in air distribution mode and flame center, etc., all have a great impact on the increase or decrease of steam temperature;

★ The effect of load changes on steam temperature.

  The thermal characteristics of the superheater and reheater determine the magnitude of the influence of load changes on the steam temperature. In the currently widely used combined superheater, two types of superheaters with different thermal characteristics are used, such as convection and radiation, so that the steam temperature is affected. The influence of boiler load changes is small, but it is generally still close to convection characteristics, and the steam temperature increases and decreases correspondingly as the boiler load increases or decreases;

★ The effect of steam pressure changes on steam temperature.

  The higher the steam pressure, the higher the corresponding saturation temperature; otherwise, the lower. Therefore, if the steam pressure is increased or decreased by a large margin due to a certain disturbance, the steam temperature will increase or decrease accordingly;

★ The influence of feed water temperature and desuperheating water volume on steam temperature.

  In a drum boiler, if the feed water temperature decreases or increases, the steam temperature will increase or decrease. The amount of desuperheating water directly affects the drop and rise of steam temperature;

★ The effect of high-pressure cylinder exhaust steam temperature on reheated steam temperature.

  The temperature of the inlet and outlet steam of the reheater increases and decreases correspondingly with the temperature rise and fall of the exhaust steam of the high pressure cylinder.

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