船舶柴油机NO<sub><i>x</i></sub>比排放计算方法

尹自斌; 吴桂涛; 孙培廷

船舶柴油机NO_x比排放计算方法

尹自斌^{1, 2,},
吴桂涛¹,
孙培廷¹

1.
大连海事大学轮机工程学院, 辽宁大连 116026
2.
集美大学轮机工程学院, 福建厦门 361021

基金项目:

国家自然科学基金项目 50276006

详细信息

作者简介:
尹自斌(1971-)，男，四川开江人，大连海事大学博士研究生，从事船舶柴油机动力学性能研究

中图分类号: U664.121
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- 被引次数: 0
出版历程
- 收稿日期: 2005-06-25
- 刊出日期: 2005-12-25

Calculation method of brake NO_x emission from marine diesel engine

1.
School of Marine Engineering, Dalian Maritime University, Dalian 116026, China
2.
School of Marine Engineering, Jimei University, Xiamen 361021, China

More Information

Author Bio:
Yin Zi-bin(1971-), male, doctoral student, 86-411-84729799, onlyyinzb@163.com

摘要

摘要: 为了提高船舶柴油机排气流量计算精度, 利用柴油机不完全燃烧化学反应方程及元素质量平衡关系, 推导出一种新的排气流量NO_x比排放计算方法, 不需要计算CO₂的浓度参数, 避免排放量的迭代计算。为适应NO_x排放实船测试的特点和要求, 探讨了基于该方法的近似计算方法和排气浓度简化测试方案。新方法比简单碳平衡法排气流量计算精度高1.1%~1.5%, NO_x比排放计算精度高0.3%~0.6%, 忽略CO、HC成分浓度所造成的加权NO_x比排放误差在0.2%以内。结果分析表明, 忽略排气中CO和HC的实船简化测试方案是可行的, NO_x排放实船测试可以采用便携式气体分析仪。
- 轮机工程 /
- 船舶柴油机 /
- NO_x排放 /
- 实船测试 /
- 计算方法
Abstract: In order to improve the computation precision of exhaust gas flows, a new calculation method of brake NO_x emission from marine diesel engine was deduced by chemical reaction equations based on incomplete combustion and the principle of element quality balance, CO₂ gas was ignored, iterative calculation was avoided.For meeting the requirements and characteristics of on-board measurement of NO_x emission, approximate calculation methods based on the new method and simplified measurement were discussed. The calculation result of a example shows that the exhaust gas flows calculated by the new method are more accurate by 1.1%~1.5% than by carbon balance method, brake NO_x emission is more accurate by 0.3%~0.6%, and the error of weighted brake NO_x emission caused from ignoring CO and HC is less than 0.2%. The result proves the feasibility of simplified on-board measurement of NO_x emission because of ignoring CO and HC by handy gas analyzer.
- marine engineering /
- marine diesel engine /
- NO_x emission /
- on-board measurement /
- calculation method

HTML全文

图 1 排气质量流量对比

Figure 1. Computation result comparison of exhaust gas mass flows

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图 2 NO_x比排放对比

Figure 2. Computation result comparison of brake NO_x emissions

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图 3 误差敏感系数

Figure 3. Sensitivity parameters of error

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图 4 排气质量流量对比

Figure 4. Comparison of exhaust gas mass flows

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图 5 NO_x比排放对比

Figure 5. Comparison of brake NO_x emissions

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表 1 计算系数取值

Table 1. Values of computation coefficients

气体	u	v	w
NO_x	0.001587	0.002053	0.002053

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表 2 燃油成分

Table 2. Fuel mass composition

碳所占的质量份额/%	氢所占的质量份额/%	硫所占的质量份额/%
86.02	13.80	0.18

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表 3 原始测量数据

Table 3. Original measured data

工况	1	2	3	4
柴油机参数
功率/kW	1082	809	538	269
转速/(r·min^-1)	1000	1000	1000	1000
燃油流量/(g·s^-1)	60.07	45.10	31.81	18.88
大气参数
大气压力/kPa	100.73	100.74	100.77	100.77
大气温度/℃	25.9	23.0	23.2	22.7
大气相对湿度/%	45.7	59.4	58.6	58.0
扫气参数
冷空气温度/℃	53.6	52.6	51.5	51.7
冷空气参考温度/℃	39.53	38.53	39.15	40.12
扫气压力(表压)/kPa	291	209	126	54
排气参数
NO_x的湿体积浓度	8.70×10^-4	8.25×10^-4	6.99×10^-4	5.02×10^-4
CO的干体积浓度	2.50×10^-5	2.10×10^-5	3.40×10^-5	9.70×10^-5
O₂的干体积浓度/%	12.52	13.15	13.38	14.02
HC的湿体积浓度	1.06×10^-4	1.16×10^-4	2.10×10^-4	2.53×10^-4
CO₂的干体积浓度/%	6.10	5.69	5.47	5.01

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参考文献(4)

[1]	吕代臣. 船用柴油机NO_x排放实船测试技术与计算方法的研究[D]. 大连: 大连海事大学, 2001.
[2]	刘军, 苏清祖. 根据排气成分确定空燃比的研究[J]. 内燃机学报, 2000, 18(3): 308—314. Liu Jun, Su Qing-zu. Research on air-fuel ratio model based on vehicle emission[J]. Transactions of CSICE, 2000, 18(3): 308—314. (in Chinese)
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[4]	李士信. 船用柴油机氮氧化物排放台架试验[M]. 北京: 人民交通出版社, 2000.