90kw Industrial Steam boiler

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The influence of steam generator outlet gas flow rate on temperature!
The influencing factors of the temperature change of the superheated steam of the steam generator mainly include the change of the temperature and flow rate of the flue gas, the temperature and flow rate of the saturated steam, and the temperature of the desuperheating water.
1. The influence of flue gas temperature and flow velocity at the furnace outlet of the steam generator: when the flue gas temperature and flow velocity increase, the convective heat transfer of the superheater will increase, so the heat absorption of the superheater will increase, so the steam The temperature will rise.
There are many reasons that affect the flue gas temperature and flow rate, such as the adjustment of the amount of fuel in the furnace, the strength of combustion, the change of the nature of the fuel itself (that is, the change of the percentage of various components contained in coal), and the adjustment of excess air. , the change of burner operation mode, the temperature of the steam generator inlet water, the cleanliness of the heating surface and other factors, as long as any one of these factors changes significantly, various chain reactions will occur, and the It is directly related to the change of flue gas temperature and flow rate.
2. The influence of the saturated steam temperature and flow rate at the superheater inlet of the steam generator: when the saturated steam temperature is low and the steam flow rate becomes larger, the superheater is required to bring more heat. Under such circumstances, it will inevitably cause changes in the working temperature of the superheater, so it directly affects the temperature of the superheated steam.

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The factors affecting the temperature of saturated steam and the flow rate are mainly the change of steam generator load, that is, the adjustment of steam production star and the level of pressure in the pot. Changes in the water level in the pot will also cause changes in the humidity of the steam, and changes in the inlet water temperature and combustion conditions of the steam generator will also cause changes in the steam production.
According to different types of superheaters, the temperature of the steam in the superheater varies with the load. The steam temperature of the radiant superheater decreases as the load increases, and the opposite is true for the convective superheater. The higher the water level in the pot, the higher the steam humidity, and the steam needs a lot of heat in the superheater, so the steam temperature will drop.
If the inlet water temperature of the steam generator is low, so the amount of steam flowing through the heater decreases, so the heat absorbed in the superheater will increase, so the steam temperature at the outlet of the superheater will decrease. rise.