粉煤成型过程的数值模拟

Numerical simulation of pulverized coal forming process

  • 摘要: 为明确摩擦系数和成型压力对煤粉成型过程的影响,利用MSC.Marc软件定量化分析了粉煤在成型过程中非均质变化的特点,获得成型过程中的应力、密度和位移等分布参数。结果显示,随着摩擦系数的增加,最大位移逐渐变小,相对密度的均匀性减小,最大应力由6.013 MPa急剧增长到71.22 MPa,极易导致型煤发生开裂。随着成型压力的增加,最大位移不断增加,相对密度略有增加,而最大应力却呈现急剧增长的趋势。因此,煤粉成型过程中应适当降低摩擦系数且不可盲目增加成型压力。

     

    Abstract: To clarify the influence of friction coefficient and molding pressure on the pulverized coal molding process, the MSC. Marc software was used to quantitatively analyze the characteristics of heterogeneous change of pulverized coal in the molding process, and the distribution parameters in the molding process were obtained, such as stress, density and displacement. The results show that with the increase of friction coefficient, the maximum displacement gradually decreases, the uniformity of relative density decreases, and the maximum stress increases sharply from 6.013 MPa to 71.22 MPa , which easily causes the cracking of the briquette. Moreover, with the increase of forming pressure, the maximum displacement continues to increase, and the relative density slightly increasea, while the maximum stress shows a sharp increasing trend. Therefore, the friction coefficient should be appropriately reduced and the molding pressure should not be blindly increased during the pulverized coal molding process.

     

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