【摘要】 好氧反应过程中的温度变化模拟预测,对于垃圾填埋场好氧通风系统的安全运行具有重要意义。在热释放守恒定律的基础上,建立考虑液体回灌条件下生活垃圾好氧反应过程中的热平衡方程;将氧气消耗速率引入热释放速率模型中,并提出两阶段氧气消耗速率模型来描述好氧反应过程中的热释放效应;开展通风强度、回灌条件和等效热传导系数对好氧反应过程中垃圾堆体温度变化影响的模拟。结果表明:气体交换导致垃圾堆体的峰值温度至少下降3.6%,液体回灌使垃圾温度降低超过24.1%;液体回灌量从每周500 mL增加到每周1 500 mL,垃圾峰值温度下降29.1%;回灌液体温度每相差10℃,对垃圾温度的影响最多可达4.0℃;随着等效热传导系数从0.3升到1.0,垃圾峰值温度逐渐降低,达到峰值强度的时间提前25.9%,后期温度下降幅度变小。研究结果为好氧通风系统运行过程中温度预测及安全调控提供了理论依据。更多还原

【Abstract】 The simulation of temperature change during aerobic reaction is of great significance for the safe operation of aerobic ventilation system in landfills. Based on the law of conservation of heat release, the heat balance equation in the process of aerobic reaction of municipal solid waste under liquid recharge conditions was established. The oxygen consumption rate of heat release rate model was introduced, and a two-stage model of oxygen consumption rate was used to describe the effect of heat release during the aerobic reaction. The effects of ventilation intensity, recirculation conditions and equivalent heat transfer coefficient on the temperature change of the waste heap during aerobic reaction were simulated. The results show that the gas exchange causes the peak temperature of the waste heap to drop by at least 3.6%, and the liquid recirculation reduces the waste temperature by more than 24.1%. As the liquid recirculation rate increases from 500 mL per week to 1 500 mL per week, the peak temperature of the waste decreases by 29.1%. With a temperature difference of 10 ℃ per recirculation liquid, the effect on the temperature of the waste can reach up to 4.0 ℃. As the equivalent heat transfer coefficient increases from 0.3 to 1.0, the peak temperature of the waste decreases. The time to reach the peak intensity is 25.9% earlier, and the temperature drop in the later stage becomes smaller. The above results provide a theoretical basis for temperature prediction and safety regulation during the operation of aerobic ventilation system.更多还原