Synergistic reduction of NO x and CO2 emissions by coupling pulverized coal with biomass gas

doi:10.16085/j.issn.1000-6613.2022-2189

Abstract

Abstract:

In view of the "double carbon" policy goal proposed by China, taking a 350MW pulverized coal/biomass gas mixed combustion boiler as the research object, the effects of biomass gas blending ratio and air classification technology on the furnace temperature, NO _x and CO₂ generation and the burnout characteristics of pulverized coal were numerically simulated. The results showed that the temperature of the main burner zone will be reduced by increasing the blending amount of biomass gas and the air classification technology. The temperature will be reduced from 1539K to 1266K, and the flame center in the furnace will move upward. Due to the comprehensive factors such as the increase of the reducing atmosphere medium in the furnace, the decrease of the temperature in the main burner area, the large proportion of N₂ in the biomass gas and the small proportion of CO₂, the pulverized coal/biomass gas co-combustion combined with air classification technology can synergistically reduced the emissions of NO _x and CO₂, with NO _x emissions reduced from 345μL/L to 88μL/L, and CO₂emissions reduced from 22.90% to 10.67%.However, the mixing of pulverized coal and biomass gas will reduce the residence time of pulverized coal particles in the furnace. It was recommended to increase the burnout rate of pulverized coal by increasing the furnace height, reduced the particle size of pulverized coal particles, and pretreated the biomass gas to a higher temperature. The research results can provided technical support for low nitrogen and low carbon operation of pulverized coal/biomass gas co-fired boiler.

Key words: pulverized coal/biomass gas, blending ratio, air staging, carbon emission, numerical simulation

摘要：

针对我国提出的“双碳”目标，以某350MW煤粉/生物质气混烧锅炉为研究对象，数值模拟了生物质气的掺烧比和空气分级技术对炉内温度、NO _x 和CO₂的生成量及煤粉的燃尽特性的影响。结果表明：增加生物质气的掺烧量和空气分级技术均会降低主燃烧器区的温度，温度由1539K降至1266K，炉内火焰中心上移。由于炉内还原气氛介质增加、主燃烧器区温度降低、生物质气中N₂的占比多及CO₂占比少的综合因素，煤粉/生物质气混烧联合空气分级技术能协同降低NO _x 和CO₂的排放量，NO _x 排放量由345μL/L降至88μL/L，CO₂排放量由22.90%降至10.67%。但煤粉混烧生物质气会减少煤粉颗粒在炉内的停留时间，建议通过增大炉膛高度、减小煤粉颗粒的粒径、将生物质气预处理到较高温度等方法提高煤粉的燃尽率。该研究结果可为煤粉/生物质气混烧锅炉的低氮和低碳运行提供技术支持。

关键词: 煤粉/生物质气, 掺烧比, 空气分级, 碳排放, 数值模拟

CLC Number:

TK229.91

FAN Baotian, YAN Zhenrong, SU Houde, LIU Cenfan, SONG Yujuan. Synergistic reduction of NO _x and CO₂ emissions by coupling pulverized coal with biomass gas[J]. Chemical Industry and Engineering Progress, 2023, 42(10): 5501-5508.

范宝田, 严祯荣, 苏厚德, 刘岑凡, 宋玉娟. 煤粉耦合生物质气协同降低NO _x 和CO₂的排放技术[J]. 化工进展, 2023, 42(10): 5501-5508.

Figures/Tables 15

References 25

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工业分析w_ar/%				元素分析w_ar/%					低位热值/kJ·kg^-1
w(M)	w(A)	w(V)	w(FC)	w(C)	w(H)	w(O)	w(N)	w(S)	低位热值/kJ·kg^-1
16.00	5.04	28.05	50.91	64.00	3.78	10.08	0.67	0.43	24320

工业分析w_ar/%				元素分析w_ar/%					低位热值/kJ·kg^-1
w(M)	w(A)	w(V)	w(FC)	w(C)	w(H)	w(O)	w(N)	w(S)	低位热值/kJ·kg^-1
16.00	5.04	28.05	50.91	64.00	3.78	10.08	0.67	0.43	24320

生物质气体积分数/%						密度/kg·m^-3	显热/kJ·m^-3	空燃比	低位热值/kJ·m^-3
N₂	CO	H₂	CO₂	CH₄	H₂O	密度/kg·m^-3	显热/kJ·m^-3	空燃比	低位热值/kJ·m^-3
40.30	25.49	21.53	8.00	0.45	4.23	1.078	1126	1.6	5696

生物质气体积分数/%						密度/kg·m^-3	显热/kJ·m^-3	空燃比	低位热值/kJ·m^-3
N₂	CO	H₂	CO₂	CH₄	H₂O	密度/kg·m^-3	显热/kJ·m^-3	空燃比	低位热值/kJ·m^-3
40.30	25.49	21.53	8.00	0.45	4.23	1.078	1126	1.6	5696

反应式	A_r	E_r/J·kmol^-1	速率指数
(2)	2.119×10¹¹	2.027×10⁸	[vol]:0.2；[O₂]:1.3
(3)	2.240×10¹²	4.180×10⁷	[CO]:1；[O₂]:1.3
(4)	5.690×10¹¹	1.465×10⁸	[H₂]:1；[O₂]:0.5
(5)	1×10¹⁵	1×10⁸	[CH₄]:0.2；[O₂]:1.3

Synergistic reduction of NO _x and CO₂ emissions by coupling pulverized coal with biomass gas

煤粉耦合生物质气协同降低NO _x 和CO₂的排放技术

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Figures/Tables 15

References 25

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反应式	A_r	E_r/J·kmol^-1	速率指数
(10)	0.005	7.396×10⁷	[O₂]:1
(11)	0.00635	1.620×10⁸	[CO₂]:1.3
(12)	0.00192	1.469×10⁸	[H₂O]:1

参数	纯煤	掺烧10%生物质气	掺烧20%生物质气	掺烧30%生物质气	改造工况
一次风量/kg·s^-1	81	81	81	81	80
二次风量/kg·s^-1	137	137	137	137	83
燃尽风量/kg·s^-1	105	105	105	105	52
分离燃尽风量/kg·s^-1	—	—	—	—	108
一次风与煤粉的温度/K	337	337	337	337	337
二次风温度/K	484	484	484	484	484
煤粉量/kg·s^-1	34.72	31.25	27.78	24.31	24.31
生物质气量/m³·s^-1	—	14.82	29.64	44.46	44.46
生物质气的温度/K	363	363	363	363	363

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