Abstract
Based on the prototypes of a 130 t/h boiler, constant proportional cold-state test bench is established, flow characteristics of multi-nozzle in natural gas reburning burner and its influence on the covering effect for the upflow in the furnace are researched. Numerical simulations of this process are also made with standard turbulence model. The results show that air flow fullness in furnace is better in the case of the reburning zone with 8 nozzles compared to 4 nozzles and also coverage effect of the reburning flow for the updraft gas in the furnace is better. In the condition each nozzle airflow velocity is constant, the effect of reburning flow on coverage of up-secondary air is best when the incident angle for four corners is 14.17?, while Center of the furnace wall is 84.57. And while the best incident angle is invariable, the effect of reburning flow on coverage of up-secondary air is best when the speed of reburning gas in the corners of furnace is 51 m/s, the same to the center of the furnace wall’s.
Highlights
Natur al gas reburning technology is a promising method for denitrification[1], In recent years, study on mechanism of reduce NOx with natural gas reburning in many countries found that compounds containing nitrogen HCN in reburning fuel has important influence on the reburning process
The results show that air flow fullness in furnace is better in the case of the reburning zone with 8 nozzles compared to 4 nozzles and coverage effect of the reburning flow for the updraft gas in the furnace is better
Similarity simulation principle is applied with velocity characterization of concentration and the two phase flow processing for the single phase fluid.T he influence of reburning nozzle numbers, incident angle and airflow speed on the flow field inside the furnace will be studied with the method of numerical simulation and cold-state test in order to optimize the natural gas reburning technology and provide reference for engineering application
Summary
Natur al gas reburning technology is a promising method for denitrification[1], In recent years, study on mechanism of reduce NOx with natural gas reburning in many countries found that compounds containing nitrogen HCN in reburning fuel has important influence on the reburning process. Study on reburning gas flow field is important for investigation on gas mixing characteristics in furnace and its effect on the reduction of NOx. In this paper, compared with only 4 reburning nozzles in four corners, another 4 reburning nozzles is added in the center of the furnace wall in order to improve air flow fullness inside the furnace, achieving the purpose of effective reduction NOx. Similarity simulation principle is applied with velocity characterization of concentration and the two phase flow processing for the single phase fluid.T he influence of reburning nozzle numbers, incident angle and airflow speed on the flow field inside the furnace will be studied with the method of numerical simulation and cold-state test in order to optimize the natural gas reburning technology and provide reference for engineering application
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