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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2020, Vol. 54 Issue (5): 1014-1021    DOI: 10.3785/j.issn.1008-973X.2020.05.020
Energy and Power Engineering     
Performance of incinerator-waste heat boiler and NOx emissions in solid waste incineration power plants
Jun LIU(),Quan-gong LI,Yi-han LIAO,Wei-shu WANG
School of Electic Power, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
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Abstract  

The flue gas composition on the outlet of economizer and the flue gas temperature in the furnace were tested in a waste incineration power plant with a waste disposal capacity of 500 t/d, in order to master the operation status of a newly built units and explore the influence of flue gas recirculation on the pollutant emission of a waste incineration power plant. The performance of the incinerator-waste heat boiler was experimentally studied, and the efficiency of the incinerator-waste heat boiler and the heat losses were quantitatively calculated. The influencing factors of NOx emissions were analyzed based on the test results. Results indicate that the largest proportion of the total heat loss is the exhaust heat loss under different loads, and the next is the heat loss of slag. The influence of flue gas recirculation on the efficiency of incinerator-waste heat boiler is small within the test range. The oxygen volume fraction in the flue gas and the flue gas recirculation have significant influence on NOx emissions. The NOx mass concentration on the outlet of the economizer increased from 209.54 mg/m3 to 307.30 mg/m3, that is an increase of 46.65%, when the oxygen volume fraction on the outlet of the economizer increased from 4.52% to 8.00%. The NOx mass concentration on the outlet of the economizer decreased from 209.54 mg/m3 to 126.15 mg/m3 when the flue gas recirculation valve was fully opened, compared with the shutdown of flue gas recirculation system.

Key words： solid waste incineration      incinerator-waste heat boiler      NOx emissions      flue gas recirculation      performance test     
Received: 16 May 2019      Published: 05 May 2020
CLC:  TQ 028.8  
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Jun LIU
Quan-gong LI
Yi-han LIAO
Wei-shu WANG
Cite this article:

Jun LIU,Quan-gong LI,Yi-han LIAO,Wei-shu WANG. Performance of incinerator-waste heat boiler and NOx emissions in solid waste incineration power plants. Journal of ZheJiang University (Engineering Science), 2020, 54(5): 1014-1021.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2020.05.020     OR     http://www.zjujournals.com/eng/Y2020/V54/I5/1014


垃圾焚烧电厂焚烧炉-余热锅炉性能及NOx排放

为了掌握新建机组运行状况，探索烟气再循环对垃圾焚烧电厂污染物排放的影响，针对某垃圾处理量为500 t/d的垃圾焚烧电厂，现场测试省煤器出口烟气成分及炉内烟气温度，试验研究焚烧炉-余热锅炉性能，定量计算焚烧炉-余热锅炉效率及各项热损失，并根据试验测试结果，分析炉内NOx生成的影响因素. 结果表明：在不同负荷下，机组总热损失中排烟热损失所占比例最大，其次为炉渣热损失，在试验范围内，烟气再循环量对焚烧炉-余热锅炉效率影响较小；烟气中氧气的体积分数及烟气再循环对NOx排放影响显著，省煤器出口氧气的体积分数由4.52%增加到8.00%，NOx质量浓度由209.54 mg/m3升高到307.30 mg/m3，增加46.65%；与烟气再循环系统停运相比，当烟气再循环阀门全开时，省煤器出口NOx质量浓度由209.54 mg/m3降为126.15 mg/m3.


关键词： 垃圾焚烧,  焚烧炉-余热锅炉,  NOx排放,  烟气再循环,  性能试验 
Fig.1 System and flow diagram of waste incineration power generation
项目 参数
设计垃圾热值/（kJ?kg?1） 6 699.00
烟气在>850 °C的条件下停留时间/s ≥2.00
焚烧残渣热灼减率/% ≤3.00
省煤器出口烟气温度/°C 190～220
焚烧炉-余热锅炉效率（100%MCR）/% 80.00
锅炉额定蒸发量（100%MCR）/（t?h?1） 51.8
蒸汽压力/MPa 4.0
主蒸汽温度/°C 400
汽包工作压力/MPa 5.0
汽包工作温度/°C 266
给水温度/°C 130
Tab.1 Main design parameters of incinerator-waste heat boiler
Fig.2 System diagram of flue gas sampling and analysis
项目 mwaste/
（t?d?1） 		ρ（CO）/
（mg?m?3） 		qm/
（kg?s?1） 		θ1/
°C 		θ2/
°C 		θ3/
°C 		θ850/
°C 		t/s Qout/
MW 		$Q_{{\rm{emi}}}^{{\rm{loss}}}$/
MW 		$Q_{{\rm{slag}}}^{{\rm{loss}}}$/
MW 		$Q_{{\rm{ash}}}^{{\rm{loss}}}$/
MW 		$Q_{{\rm{rad}}}^{{\rm{loss}}}$/
MW 		$Q_{{\rm{total}}}^{{\rm{loss}}}$/
MW 		Lemi/
% 		Lslag/
% 		Lash/
% 		Lrad/
% 		η/
% 		$\bar \eta $/
%
60%MCR 286.2 2.26 24.62 830 874 904 917 5.53 25.04 4.29 0.88 0.08 0.29 5.54 14.04 2.88 0.27 0.93 81.88 77.04
100%MCR 509.2 5.33 33.96 893 949 973 986 5.82 34.42 6.53 1.39 0.16 0.36 8.44 15.24 3.24 0.38 0.83 80.3 80.42
110%MCR 564.5 7.12 35.85 943 1 014 1 032 1 053 5.79 40.29 7.02 1.77 0.22 0.40 9.41 14.12 3.57 0.44 0.8 81.07 80.63
Tab.2 Test results of incinerator-waste heat boiler performance under different load conditions
项目 qm/（kg?s?1） θeco/°C Qout/MW $Q_{{\rm{emi}}}^{{\rm{loss}}}$/MW $Q_{{\rm{slag}}}^{{\rm{loss}}}$/MW $Q_{{\rm{ash}}}^{{\rm{loss}}}$/MW $Q_{{\rm{rad}}}^{{\rm{loss}}}$/MW $Q_{{\rm{total}}}^{{\rm{loss}}}$/MW Lemi/% Lslag/% Lash/% Lrad/% η/% $\bar \eta $/%
工况1 33.96 193 34.42 6.53 1.39 0.16 0.36 8.44 15.24 3.24 0.38 0.83 80.3 80.42
工况2 33.68 195 34.36 6.41 1.41 0.18 0.36 8.36 15.00 3.30 0.42 0.84 80.43 80.37
工况3 33.41 198 33.98 6.48 1.42 0.18 0.35 8.43 15.28 3.35 0.42 0.83 80.12 80.26
Tab.3 Effect of recirculating flue gas on efficiency of incinerator-waste heat boiler
项目 qVrec/（m3?h?1） qVurea/（L?h?1） φ（O2）/% ρ（CO）/（mg?m?3） φ（CO2）/% ρ（NOx）/（mg?m?3） θeco/°C
工况1 0 0 4.52 9.56 13.92 209.54 198
工况2 0 0 6.25 4.58 12.50 265.01 196
工况3 0 0 8.00 1.97 10.98 307.30 198
Tab.4 Test results of flue gas composition on outlet of economizer with different O2 volume fractions
项目 Z/% Vrec/（m3?h?1） Vurea/（L?h?1） φ（O2）/% ρ（CO）/（mg?m?3） φ（CO2）/% ρ（NOx）/（mg?m?3） θeco/°C
工况1 100 16 163.9 0 4.43 11.48 14.07 126.15 193
工况2 50 9 345.7 0 4.39 11.30 14.13 178.90 195
工况3 0 0 0 4.52 9.56 13.92 209.54 198
Tab.5 Test results of flue gas composition on outlet of economizer with different volume flow rates of recirculating flue gas
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