Study on Computational Method for Explosion Venting Area of Primary Hot Air Duct in Coal Mill System
In order to reduce the dust explosion risk during the pulverized coal preparation process in thermal power plants,in this paper,a quantitative computational method for the explosion venting area of the primary hot air duct was studied. First,the maximum explosion pressure and explosion index were obtained by experimental tests taking the pulverized coal used in three power plants in different regions as examples. Then,the antiknock strength of the primary hot air duct of a type of me-dium-speed mill was analyzed and calculated using the Ansys software. Finally,the explosion venting area of the primary hot air dust of the medium-speed mill was determined in accordance with the Dust Explosion Pressure Relief Guide standard. The results show that both the explosion pressure and explosion index obtained by experiments initially increase as the con-centration increases,and later decrease as the concentration increases after reaching the peak value;and that the antiknock strength of the primary hot air duct calculated through simulation software ranges from 0.014 to 0.14 MPa;and that the ex-plosion venting area required by the primary hot air duct is 0.33 to 0.09 m2,0.38 to 0.1 m2,and 0.2 to 0.06 m2,respective-ly,according to the different pulverized coal and antiknock capacity in three power plants. The above research results have reference value for the explosion venting design of the primary hot air duct in coal mill systems.
NETL
NSTL
万方数据
