基于可调谐二极管激光吸收光谱技术的炉内燃烧场参数在线监测系统设计

doi:10.12096/j.2096-4528.pgt.19183

摘要/Abstract

摘要：

基于可调谐二极管激光吸收光谱(tunable diode laser absorption spectroscopy，TDLAS)技术，设计了炉内多燃烧场参数(温度，CO、CO₂和NO浓度等)同时在线监测技术方案，包括一维燃烧参数监测系统和多维燃烧参数监测系统。在一维燃烧参数监测系统中，引入光开关技术实现多个燃烧参数的同时测量。在二维燃烧参数监测系统中，引入分光器技术和代数迭代算法(algebraic reconstruction technique，ART)实现平面内二维燃烧参数的反演和测量。在此基础上，设计了三维燃烧参数监测系统，三维燃烧参数测量步骤为：先将炉内燃烧区域划分为多层二维切片；再基于ART法重建二维燃烧参数；最后基于多层二维燃烧参数数据重构三维燃烧参数。本文所设计的炉内燃烧场参数监测系统有利于未来锅炉精细化调整。

关键词: 燃煤锅炉, 可调谐二极管激光吸收光谱(TDLAS), 污染物浓度, 在线监测系统

Abstract:

Based on the tunable diode laser absorption spectroscopy (TDLAS) technology, one-dimensional and multi-dimensional combustion parameter monitoring systems were designed to simultaneously monitor multiple combustion field parameters in the furnace (such as temperature, CO, CO₂, and NO concentration, etc.). In the one-dimensional system, the optical switch technology was applied to measure the multiple combustion parameters simultaneously. In the two-dimensional system, the spectrometer technology and algebraic reconstruction technique (ART) were introduced to inversion calculate and measure the two-dimensional combustion parameters in a layer. On this basis, the three-dimensional system was designed. The measurement procedures of three-dimensional combustion parameters were as follows: the combustion region in the furnace was divided into multilayer sections; the two-dimensional combustion parameters were reconstructed based on ART; the three-dimensional combustion parameters were reconstructed using the multilayer combustion parameter data. The combustion filed parameter monitoring system contributes to the fine combustion adjustment in the future.

Key words: coal-fired boiler, tunable diode laser absorption spectroscopy (TDLAS), pollutant concentration, online monitoring system

中图分类号:

TK 16

李源, 郭志成, 孟晓超, 陈科峰, 任利明, 毛睿, 岑可法. 基于可调谐二极管激光吸收光谱技术的炉内燃烧场参数在线监测系统设计[J]. 发电技术, 2022, 43(2): 353-361.

Yuan LI, Zhicheng GUO, Xiaochao MENG, Kefeng CHEN, Liming REN, Rui MAO, Kefa CEN. Design of an Online Monitoring System for Combustion Field Parameter in a Furnace Based on Tunable Diode Laser Absorption Spectroscopy Technology[J]. Power Generation Technology, 2022, 43(2): 353-361.

图/表 9

图1 Beer-Lambert原理

Fig. 1 Beer-Lambert principle

图2 网格化待测区域

Fig. 2 Girded measurement region

图3 一维燃烧参数监测系统

Fig. 3 One-dimensional combustion parameter monitoring system

图4 三维燃烧参数监测系统

Fig. 4 Three-dimensional combustion parameter monitoring system

图5 二维燃烧参数监测系统

Fig. 5 Two-dimensional combustion parameter monitoring system

表1 锅炉燃用煤质特性

Tab. 1 Properties of the burning coal

参数	数值
收到基水分M_ar/%	8.00
收到基挥发分V_ar/%	26.39
收到基固定碳F_Car/%	44.38
收到基灰分A_ar/%	21.23
收到基碳C_ar/%	56.91
收到基氢H_ar/%	4.39
收到基氧O_ar/%	8.06
收到基氮N_ar/%	0.86
收到基硫S_ar/%	0.55
收到基低位发热量Q_net，ar/(MJ/kg)	22.55

表2 锅炉燃烧仿真边界条件

Tab. 2 Combustion simulation boundaries of the boiler

参数	数值
机组负荷/MW	300
给煤量/(t/h)	127.5
标准状态下总风量/(m³/h)	913 869
一次风率/%	22
二次风率/%	59
三次风率/%	19
一次风温/℃	160
二次风温/℃	325
三次风温/℃	60
三次风带粉量/%	5

图6 锅炉多层切片

Fig. 6 Boiler multilayer sections

图7 炉内三维燃烧参数重建

Fig. 7 Remonstration of three-dimensional combustion parameters in furnace

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