新型发生炉防煤气泄漏装置优化  

Optimization of new gas leakage prevention device for generators

作　　者：冯美艳 郑斌黎 褚梦雅 陈昌荣 黄旭 FENG Meiyan;ZHENG Binli;CHU Mengya;CHEN Changrong;HUANG Xu(School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China;Corporation of Fujian Dingxin Technology, Ningde 352000, China)

机构地区：[1]福建工程学院机械与汽车工程学院,福建福州350118 [2]福建鼎信科技有限公司,福建宁德352000

出　　处：《福建工程学院学报》2022年第1期7-12,共6页Journal of Fujian University of Technology

基　　金：福建省中青年教师教育科研项目(JAT190407)。

摘　　要：发生炉生产煤气过程中,炉内煤气经开启的加煤阀向上泄露至缓冲煤仓和储煤仓,容易引起爆炸、人员中毒等事故,造成能源浪费和环境污染。为了降低缓冲煤仓煤气含量,并有效地封堵煤气进入储煤仓,提高置换效率及能源利用率,降低闪爆事故发生率,针对某煤气发生炉建立缓冲煤仓三维模型,采用FLUENT对缓冲煤仓吹扫N_(2)置换煤气的过程进行模拟,探究一级进气管长和二级进气角度对缓冲煤仓内煤气置换时间的影响规律。试验结果表明,缓冲煤仓内N_(2)浓度由初始60%急剧增加,8 s后达到99%,之后N_(2)浓度增长缓慢。CO浓度由初始30%逐渐降低,8 s后接近于0,完成置换。0°进气孔优于90°进气孔;进气管长占缓冲煤仓总高度的比例约为1/3时为最优,置换时间最短。该结构通过两级协同吹扫,有效解决加煤时缓冲煤仓的煤气外泄问题和储煤仓闪爆问题。In the process of furnace gas production,the gas in the furnace leaks upward through the open coal valve to the buffer coal bunker and coal storage bunker,which causes explosion,personnel poisoning,energy waste and environmental pollution.This research aims at reducing the gas content in the buffer bunker and effectively preventing gas from entering the coal storage bunker.Consequently,the replacement efficiency and energy utilization rate can be improved to reduce the incidence of flash explosions.A three-dimensional model of buffer bunker was established for a gas generator and the FLUENT was used to simulate the process of blowing N_(2) to replace gas in buffer bunker.The influence of the length of primary intake pipe and the angle of secondary inlet on the time of gas replacement in buffer bunker was investigated.Experiment results show that the N_(2) concentration in buffer bunker increases sharply from the initial 60%and reaches 99%after 8 seconds followed by a slow increase;while the CO concentration decreases gradually from the initial 30%and approximates 0 after 8 seconds,indicating that the replacement is completed.The 0-degree air inlet is better than the 90-degree one;the optimal proportion of the length of the intake pipe to the total height of the buffer coal bunker is about 1/3,and the replacement time is shorter.Through two-stage collaborative blowing,the structure effectively solves the problem of gas leakage from the buffer coal bunker and the flash explosion problem of the coal storage bunker when adding coal.

关 键 词：发生炉 煤气泄漏 N_(2)吹扫装置 气体置换 数值模拟 

分 类 号：TQ545[化学工程—煤化学工程]