On the utilization of low-calorific-value gas
Thread Content
Gentlemen, does anyone know what the appropriate temperature for the hot air in a gas boiler that burns pure blast furnace gas (with a calorific value of 750 Kcal/Nm³) should be, as well as what the adiabatic temperature inside the furnace needs to be? This furnace operates at high temperature and high pressure.
Pure combustion BFG, hot air temperature: 320°C,
Okay, thank you. However, the calorific value of BFG is low; with hot air at 320 degrees, the combustion temperature should not be very high. It might be over 1450 degrees; in that case, are there convective evaporation heating surfaces at the rear of the furnace?
220/9.8; the pure BFG hot air temperature is 377°C, it is a π-type furnace with a ceiling superheater (convection heating surface) arranged in the horizontal flue. 150/3.82; the hot air temperature purely at BFG is 329℃
The temperature of the hot air is more or less in that range, around 350°C. If the calorific value of the fuel is low, the temperature of the hot air is higher; values between 310 and 320 degrees are also commonly used, and I agree with all of this. What I’m asking is, in the tail flue, besides the superheater and economizer, are there any evaporator tubes as well? The convective evaporation tube bundle is a set of inclined coiled tubes installed to compensate for the insufficient heat absorption in the furnace
Only D-type boilers with double drum arrangements have convective evaporation tube banks; what I mentioned earlier refers to π-type boilers, which do not have such tube banks.
Not necessarily; you’ll know once you’ve prepared a plan and done the calculations
220/9.8, a pure BFG type π furnace; the cross-sectional dimensions of the furnace chamber are 7.6×7.6, and the elevation at the furnace chamber outlet is 30.4. There are 3 layers, each containing 3 swirl burners, arranged on the front wall of the furnace.
Firstly, I’m not aware of your gas volume. Based on experience, blast furnace gas can be perfectly handled by the double-regenerative steam boilers developed by Beijing Shenwu Group; each boiler has an output of 10–40 steam tons, with a thermal efficiency of over 85%! It is necessary to be able to contact me at 13501107519
wzj1975pp, could you please tell me the boiler steam parameters you mentioned first?
90t/h 9.8/540. For the hot air at 377°C you mentioned, by approximately what percentage is the burner more expensive than a regular burner? What materials are used for high-temperature air preheaters?