{"title":"CO2稀释对CH4/空气混合物层流燃烧速度、燃烧特性和NOx排放的影响","authors":"Wenlong Dong, Longkai Xiang, Jian Gao, Bingbing Qiu, Huaqiang Chu","doi":"10.1007/s40789-023-00655-9","DOIUrl":null,"url":null,"abstract":"Abstract The laminar combustion characteristics of CH 4 /air premixed flames with CO 2 addition are systemically studied. Experimental measurements and numerical simulations of the laminar burning velocity (LBV) are performed in CH 4 /CO 2 /Air flames with various CO 2 doping ratio under equivalence ratios of 1.0–1.4. GRI 3.0 mech and Aramco mech are employed for predicting LBV, adiabatic flame temperature (AFT), important intermediate radicals (CH 3 , H, OH, O) and NO x emissions (NO, NO 2 , N 2 O), as well as the sensitivity analysis is also conducted. The detail analysis of experiment and simulation reveals that as the CO 2 addition increases from 0% to 40%, the LBVs and AFTs decrease monotonously. Under the same CO 2 doping ratio, the LBVs and AFTs increase first and then decrease with the increase of equivalence ratio, and the maximum of LBV is reached at equivalence ratio of 1.05. The mole fraction tendency of important intermediates and NO x with equivalence ratio and CO 2 doping ratio are similar to the LBVs and AFTs. Reaction H + O 2 ⇔ O + OH is found to be responsible for the promotion of the generation of important intermediates and NO x under the equivalence ratios and CO 2 addition through sensitivity analysis. The sensitivity coefficients of elementary reactions that the increasing of CO 2 doping ratio promotes or inhibits formation of intermediate radicals and NO x decreases. Graphical abstract","PeriodicalId":53469,"journal":{"name":"International Journal of Coal Science & Technology","volume":null,"pages":null},"PeriodicalIF":6.9000,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of CO2 dilution on laminar burning velocities, combustion characteristics and NOx emissions of CH4/air mixtures\",\"authors\":\"Wenlong Dong, Longkai Xiang, Jian Gao, Bingbing Qiu, Huaqiang Chu\",\"doi\":\"10.1007/s40789-023-00655-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Abstract The laminar combustion characteristics of CH 4 /air premixed flames with CO 2 addition are systemically studied. Experimental measurements and numerical simulations of the laminar burning velocity (LBV) are performed in CH 4 /CO 2 /Air flames with various CO 2 doping ratio under equivalence ratios of 1.0–1.4. GRI 3.0 mech and Aramco mech are employed for predicting LBV, adiabatic flame temperature (AFT), important intermediate radicals (CH 3 , H, OH, O) and NO x emissions (NO, NO 2 , N 2 O), as well as the sensitivity analysis is also conducted. The detail analysis of experiment and simulation reveals that as the CO 2 addition increases from 0% to 40%, the LBVs and AFTs decrease monotonously. Under the same CO 2 doping ratio, the LBVs and AFTs increase first and then decrease with the increase of equivalence ratio, and the maximum of LBV is reached at equivalence ratio of 1.05. The mole fraction tendency of important intermediates and NO x with equivalence ratio and CO 2 doping ratio are similar to the LBVs and AFTs. Reaction H + O 2 ⇔ O + OH is found to be responsible for the promotion of the generation of important intermediates and NO x under the equivalence ratios and CO 2 addition through sensitivity analysis. The sensitivity coefficients of elementary reactions that the increasing of CO 2 doping ratio promotes or inhibits formation of intermediate radicals and NO x decreases. Graphical abstract\",\"PeriodicalId\":53469,\"journal\":{\"name\":\"International Journal of Coal Science & Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.9000,\"publicationDate\":\"2023-11-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Coal Science & Technology\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1007/s40789-023-00655-9\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Coal Science & Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1007/s40789-023-00655-9","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
Effect of CO2 dilution on laminar burning velocities, combustion characteristics and NOx emissions of CH4/air mixtures
Abstract The laminar combustion characteristics of CH 4 /air premixed flames with CO 2 addition are systemically studied. Experimental measurements and numerical simulations of the laminar burning velocity (LBV) are performed in CH 4 /CO 2 /Air flames with various CO 2 doping ratio under equivalence ratios of 1.0–1.4. GRI 3.0 mech and Aramco mech are employed for predicting LBV, adiabatic flame temperature (AFT), important intermediate radicals (CH 3 , H, OH, O) and NO x emissions (NO, NO 2 , N 2 O), as well as the sensitivity analysis is also conducted. The detail analysis of experiment and simulation reveals that as the CO 2 addition increases from 0% to 40%, the LBVs and AFTs decrease monotonously. Under the same CO 2 doping ratio, the LBVs and AFTs increase first and then decrease with the increase of equivalence ratio, and the maximum of LBV is reached at equivalence ratio of 1.05. The mole fraction tendency of important intermediates and NO x with equivalence ratio and CO 2 doping ratio are similar to the LBVs and AFTs. Reaction H + O 2 ⇔ O + OH is found to be responsible for the promotion of the generation of important intermediates and NO x under the equivalence ratios and CO 2 addition through sensitivity analysis. The sensitivity coefficients of elementary reactions that the increasing of CO 2 doping ratio promotes or inhibits formation of intermediate radicals and NO x decreases. Graphical abstract
期刊介绍:
The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field.
The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects.
The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.