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The Function of the Gas Recirculation of Boilers and Its Effect on Thermal Calculation

Zheng-Wu Xie, Hai-Jie Liang and De-Fu Che(Xi'an Jiaotong University, Xi'an 710049)  
The function of gas recirculation and its effect on the heat transfer calculation of heating surfaces of a boiler are discussed in this paper. The Standard Thermal Calculation Method of Boiler Unit (USSR, 1973 edition) is analyzed thoroughly and a thermal calculation method of boiler unit with gas recirculation is put forward in detail. At the end of this paper, a thermal calculation example is given. The results show that the heat transferred to the radiative heating surface of a boiler decreases and the heat transferred to the convective heating surface increases when gas recirculation is applied.
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