排风流能量品位提升循环与热回收系统运行优化

钟发清; 张艺才; 陈世强; 蒋加川; 吴　朋

排风流能量品位提升循环与热回收系统运行优化

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- 发布日期: 2023-01-19

Energy grade improvement cycle of exhaust airflow and optimization of heat recovery system operation

摘要

摘要: 如何提高矿井排风流热回收系统的热工收益，属于绿色矿山技术中前沿问题。为了解决该问题，围绕用于排风流热湿能量品位提升中的空气热泵，基于有限时间热力学，得到不可逆变温热源循环方程组，推导出了关于环境温度的火用利润率解析式，定义了无量纲火用利润率表达式；利用该表达式，结合实际工况，对6个城市最不利供给时段的无量纲火用利润率，进行了逐日和逐时对比。结果表明：排风流热回收系统适用的地域呈气候分区特征，特别适宜于温带大陆性气候区；而亚热带季风性气候区，单日火用利润率函数的变化曲线大致呈“M”型，且排风流热回收系统运行过程中产生的收益不稳定，因此，需制定热回收系统的启停策略，以避免持续运行产生亏损。提出了一种启停控制方法，数值计算而得到应用该方法前后的系统收益；经对比，在采用该控制方法后，经济收益显著提高，无因次火用利润率最高可从-0.33提高至0.02，增量达0.35。
Abstract: How to improve the thermal performance of exhaust airflow heat recovery system of mine fan diffuser is a frontier problem in green mine technology. In order to solve this problem, based on finite-time thermodynamics, the air heat pump used to improve the heat and humidity energy grade of exhaust air was used to obtain the cycle equations of ininvertible temperature and heat source, and the analytical expression of exergy profit rate about ambient temperature was derived and the expression of dimensionless exergy profit rate was defined. Used this expression and combined with the actual working conditions in period of the most difficult supply, the exergy profit rates of 6 cities are compared by every day and every hour. The results show that the suitable region of exhaust airflow heat recovery system is characterized by climate division. Especially, this system is suitable for temperate continental climate areas. In the subtropical monsoon climate areas, the change curve of exergic profit margin function in a single day is similar to the shape of “M”, and it is implacable that the revenue generated in the operation of exhaust airflow heat recovery system should be unstable. To avoid losses caused by continuous operation, it is necessary to formulate the start-stop strategy of heat recovery system, and a start-stop control method is proposed, and the benefits of the system throughout the application are calculated numerically. By comparison, the economic return is significantly improved after adopting this control method, and the maximum dimensionless exergy profit rate can be increased from -0.33 to 0.02, by an increment of 0.35.
- exhaust airflow /
- thermal energy /
- Brayton cycle /
- exergeoeconomic profit /
- ambient temperature

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