Zhang X.-L.,Xian Thermotechnical Research Institute Coltd |
Jin S.-P.,University of Science and Technology of China |
Huang S.-Y.,University of Science and Technology of China |
Ge J.-P.,Jiangsu Yanxin Science and Technology Group
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2012
The flue gases of natural gas and other hydrocarbon fuels contain a great amount of steam after their combustion.To lower the temperature of the flue gases to any temperature below the condensation temperature of the steam can recover the latent heat of the steam during condensation and the thermal efficiency of a boiler can exceed 100% as calculated according to the low heating value.The heat balance calculation results show that it is possible to recover the latent heat for condensation of flue gases by using combustion-supporting air.However, the temperature of the flue gases at the inlet has an upper limit value.To use the heat accumulation type combustion technology for gas-fired boilers can lower the temperature of the flue gases below the condensation temperature.The shorter the direction change period, the higher the thermal efficiency.When the direction change period lasts 20 seconds, the thermal efficiency can be up to 106.7%.The staged combustion of air can make the NOx emissions level reduced to around 46 mg/Nm3 (6% O2) and the fluid for condensing the flue gases can adsorb 14.3% of the NOx in the flue gases.
Zhang X.,Huazhong University of Science and Technology |
Jin S.,Huazhong University of Science and Technology |
Fang S.,Huazhong University of Science and Technology |
Wen W.,Huazhong University of Science and Technology |
And 2 more authors.
2011 International Conference on Electrical and Control Engineering, ICECE 2011 - Proceedings | Year: 2011
The basic principle and technical features of regenerative combustion technology is induced. Considering the problems faced in the development of current tubular furnace, the application feasibility of high temperature air combustion technology in tubular furnace is analyzed. A set of experimental installation of regenerative combustion tubular furnace is established in this paper. The experiment result shows that the regenerative heat exchanger is capable of decreasing the flue gas temperature in the tubular furnace under the dew-point temperature, the latent heat of condensate vapor is recovered, and the thermal efficiency is over 100% calculated by low calorific value. The impact of the switching time on the thermal efficiency is analyzed. Considering the thermal efficiency and equipment reliability, it is believed that the switching time between 4060s is reasonable. © 2011 IEEE.
Zhao D.-P.,Jiangsu Yanxin Science and Technology Group |
Zhou J.,Jiangsu Yanxin Science and Technology Group |
Tao G.-X.,Jiangsu Yanxin Science and Technology Group
Petrochemical Equipment | Year: 2014
Because of the existing problems of periodic temperature and pressure fluctuation on the technology of shift sectionalized regenerative waste recovery, one method of sectionalized re-generative waste recovery equipment and its temperature control are put forward in order that the periodic temperature fluctuation of preheating air is controlled within a certain range to be suitable for the heater which requires a high stability of preheating air.