基于模糊控制的隧道有害气体治理技术研究

针对隧道通风系统控制手段单一、控制滞后、效率低且效果差等问题，改进一种基于模糊理论的多种有害气体综合治理新方法，并采用模糊PID控制技术构建一种综合治理系统。该系统利用采样模块实时监测数据，将信号上传至分析模块进行全局把控，通过模糊控制模块在线校正参数，不断循环控制变频器来提高被控对象的运行频率，调节风量与吸收液喷雾量，最后由治理模块实施通风稀释和喷雾净化，实现对多种有害气体进行治理。该系统应用于青海省某穿煤隧道，结果表明： 该系统能够快速降低放炮后监测断面处有害气体浓度，其中掌子面处瓦斯、硫化氢的平均浓度值分别降低了17.3%、27.3%，衬砌前端处二者的平均浓度降低了12.2%、36.7%，具有较高的准确性；放炮后浓度降至规范限值的时间也由平均20 min减少至10 min左右，缩短了1~2倍，能有效保障隧道施工安全，提高隧道施工效率。

Research on Tunnel Harmful Gas Control Technology Based on Fuzzy Control

Aiming at the problems of tunnel ventilation system, such as single control means, lagging control, low efficiency, and poor effect, a new method for comprehensive treatment of multiple harmful gases based on fuzzy theory is improved, and a comprehensive treatment system is constructed using fuzzy proportional integral derivative control technology. By using real time monitoring data of sampling module, the system uploads the signal to the analysis module for global control. The fuzzy control module corrects parameters online, controls the frequency converter to improve the operating frequency of the controlled object continuously and circularly, and adjusts the air volume and the absorption liquid spray amount. Finally, ventilation dilution and spray purification are carried out by the treatment module to dispose various harmful gases. This system has been applied to a coal tunnel in Qinghai Province. The results show that the system can quickly reduce the concentration of gas and hydrogen sulfide at the monitoring section after blasting, and the average concentration values are reduced by 17.3%, 27.3% respectively at the excavation workface, 12.2% and 36.7% at the front end of the lining, with high accuracy. After blasting, the time for the concentration to drop to the standard limit is also reduced from 20 min to 10 min on average, which is shortened by about 1~2 times. It effectively ensures the safety of tunnel construction and improves the efficiency of tunnel construction.