The inlet temperature of the converter must be maintained above 25°C, which is the dew point temperature
Thread Content
The inlet temperature of the shift converter must be maintained above a dew point temperature of 25°C. How is this dew point determined? For example, if the inlet temperature of the shift system is 181°C and the pressure is 3.89 MPa gauge, how can the dew point temperature be calculated?
Dew point temperature refers to the temperature at which cooling occurs until saturation, under conditions where both the water vapor content and air pressure remain unchanged. The temperature of the process gas entering the shift reactor, coming out of the wash tower, is the saturated temperature. The inlet temperature of the shift system is 181°C; it’s not clear what temperature that represents. If it’s the temperature coming out of the gas-liquid separator, then the dew point temperature should also be 181°C. In that case, simply add 25°C to the inlet temperature of the shift furnace.
It is the temperature after vaporization; the temperature after the gas-liquid separator is 176℃
It can’t be simply +25 degrees on top of 181 degrees. The partial pressure of saturated steam must be calculated based on the furnace water-vapor ratio at this operating pressure (absolute pressure). The temperature corresponding to this pressure (as found in tables) is the \"dew point\" temperature; the inlet temperature of the shift converter is then +25 degrees above this temperature.
Although not entirely accurate, the approximation should be fairly close; it can be used if precision isn’t a major concern. The calculations are relatively accurate, but the water vapor ratio needs to be known, and calculating this ratio also requires the saturated steam temperature, which brings us back to the same point. Therefore, the water vapor ratio used in calculations is also an estimated value. . .
Is your gasification powder coal gasification? 181 degrees is the inlet temperature of the converter, 3.89 MPa is the inlet pressure of the conversion system, and your water vapor ratio should be around 1.0. Under these operating conditions, the temperature upon entry into the furnace should be above 230 degrees.
All of the above statements are reasonable. :lol:lol
Based on your water vapor ratio, the saturation temperature should be around 210°C. Since the inlet temperature for the conversion process is 181°C, which is below the saturation temperature, it means that the process gas entering the conversion unit already contains water vapor. . . . Agree to powder coal gasification, but the water vapor ratio should be around 0.4-0.5
No, it’s pressurized gasification of coal. For this water-to-gas ratio, are you referring to the ratio of water vapor to dry gas?
Shouldn’t the value of the water vapor ratio be determined with reference to design data, and adjusted appropriately based on the reaction conditions in the converter? Why can you give the water vapor ratio directly? Seeking advice
Could you tell me how you calculate the water-to-vapor ratio?