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为了探讨城镇燃气爆炸强度与反应初始温度的对应关系,根据工程热力学研究定组分混合气体的基本方法以及阿马格分体积定律将城镇燃气简化为含碳、氢、氧、氮的单一气体,简化其热化学反应方程式及反应终态温度的求解办法。在此基础上采用经典的气体爆炸强度公式计算不同反应初始温度下城镇燃气(体积分数10%)-空气混合气体理论上的最大爆炸压力和最大压力上升速率。结果表明,城镇燃气的最大爆炸压力及最大压力上升速率随初始温度的提高而线性减小,近似成反比例关系。为了验证理论计算所得结论的正确性,采用经典爆炸特性参数测试系统实测了该混合气体对应初始温度下的爆炸强度。实测结果与理论计算结果所得结论基本吻合,且最大爆炸压力的理论值与实测值最大误差为13.95%,最大爆炸压力上升速率的理论值与实测值最大误差为14.52%,满足工程应用(最大误差不超过20%)的需要。该理论计算方法可以近似估算不同初始温度下城镇燃气-空气混合气体的爆炸强度。在爆炸极限范围内城镇燃气的爆炸强度随反应初始温度的增加而线性减少,二者近似成反比例关系。
In order to discuss the corresponding relationship between urban gas explosion intensity and reaction initial temperature, the city gas is simplified to a single gas containing carbon, hydrogen, oxygen and nitrogen according to the basic method of determining the composition of mixed gases and the Amargue volume rule. Simplify its thermochemical reaction equation and reaction solution of the final temperature. Based on this, the maximum explosion pressure and the maximum pressure rise rate of urban gas (volume fraction 10%) - air mixed gas at different reaction initial temperatures were calculated using the classical gas explosion intensity formula. The results show that the maximum explosion pressure and the maximum pressure rise rate of urban gas decrease linearly with the increase of initial temperature, which is approximately inversely proportional. In order to verify the correctness of the theoretical calculation, the explosion intensity of the mixed gas at the initial temperature was measured by the classical explosion characteristic parameter test system. The experimental results are in good agreement with the theoretical ones. The maximum error between the theoretical and measured values of the maximum explosion pressure is 13.95%. The maximum error between the theoretical and measured values of the maximum explosion pressure rise rate is 14.52%, which satisfies the engineering application (maximum error Not more than 20%) needs. The theoretical calculation method can approximate the intensity of explosion of town gas-air mixture at different initial temperatures. The explosion intensity of urban gas within the limit of explosion linearly decreases with the increase of reaction initial temperature, and the two are approximately inversely proportional.