为处理矿井大流量乏风中的超低浓度甲烷,拟采用将乏风作为锅炉二次风进行处理利用。对此类工程改造的锅炉引风、投资运行成本、项目改造收益、锅炉效率影响进行了分析。结果表明,矿井乏风甲烷利用工程改造减小了原来锅炉烟气的产生量,且烟气量改变很小,无需对锅炉侧进行改造。管道及保温材料的采购与安装是此类改造工程的主要投资部分。该类项目的主要收益为乏风处理的碳汇补贴收益。乏风流速越低,工程投资成本变高,但运行成本变低,有助于项目的长周期盈利。绘制了不同输运长度下乏风总量与瓦斯绝对涌出量的20年期盈利平衡曲线。提出了优化矿井侧及二次风侧的乏风输送系统,并对乏风温度、湿度等因素对锅炉效率的影响进行了分析。对矿井乏风利用项目的立项及可行性分析提供了指导。

In order to treat with ultra-low concentration methane in high flow ventilation air in mines,the ventilation air is fed into the boiler as a secondary air.Induced draft fan,investment and operating cost,project renovation earnings and the influence of boiler efficiency for these engineering reconstructions are analyzed.Results illustrate that the boiler generates less flue gas after using ventilation air methane.The variation of mass flow rate of the fuel gas is so small that there needs no technological transformation on induced draft fan of the boiler.Majority investment of such renovation project is subject to procurement and installation of pipelines and thermal insulation cotton.Carbon sink part is the main earnings for such a project.Low flow velocity of the ventilation air can raise the engineering investment cost but reduce annual operating cost,which is beneficial for the profit over a long period.Earnings surplus and deficit balance curves of the project in 20-year are plotted under different transportation distances.An optimized ventilation air methane delivery system is proposed for both mine-side and secondary air-side.Meanwhile,the effect of ventilation air methane temperature and humidity on boiler efficiency is analyzed.This study provides a reference for the approval and feasibility analysis of ventilation air methane utilization projects.

郭前鑫(1970-),男,本科,高级工程师,从事电力工程技术开发和管理;魏琳(1994-),男,博士,工程师,研究方向为矿井乏风利用技术,通讯联系人,18706830601@163.com。