{"corpus_id":224840757,"paper_sha":"383ab9802c6f0ffa83b543be3f4c3fe51bbb0239","doi":"10.1016/J.JCLEPRO.2020.124310","arxiv_id":null,"pmid":null,"pmcid":null,"mag_id":3089224047,"dblp_id":null,"acl_id":null,"title":"Investigations on combustion optimization and NOX reduction of a 600-MWe down-fired boiler: Influence of rearrangement of tertiary air and jet angle of secondary air and separated over-fire air","year":2020,"publication_date":"2020-12-20","venue":"","journal":{"name":"Journal of Cleaner Production","pages":"124310","volume":"277"},"journal_issn":null,"journal_title":null,"publication_types":[],"pubmed_pub_types":null,"s2_fields_of_study":["Engineering","Environmental Science"],"reference_count":26,"citation_count":26,"influential_citation_count":0,"is_open_access":false,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":1,"s2_open_access_pdf_url":null,"s2_open_access_landing_url":null,"s2_open_access_license":null,"s2_open_access_status":null,"pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"Abstract Low-NOX combustion is the main technology for reducing NOX emission in coal-fired plants. In this work, numerical simulation was conducted on a 600-MWe down-fired lean coal boiler to study the effects of important factors on NOX reduction, namely, the arrangements of tertiary air (TA), the jet angle of secondary air (SA), the separated over-fire air (SOFA) ratio, and the SOFA jet angle. The optimal arrangement was obtained with the original TA moved down; the jet angle of SA (A layer) at 20° (downdip); the SA (F layer) and the TA at 20° and 30° (downdip), respectively; and the SOFA set in the upper furnace, with a 20% ratio and a 30° jet angle. The NOX emissions were reduced from 1527 mg/m3 to 773 mg/m3 in the optimized system. Meanwhile, the exhaust gas temperature decreased from 1387 K to 1369 K, and the unburned carbon content increased slightly by 0.24%, with the overall boiler efficiency kept nearly constant. The in situ measurement results are consistent with the simulation predictions.","claims":[{"public_id":"cl_6d2568bd44dc41cee697bcbdc59143d9","status":"active","text":"An optimized arrangement for the 600-MWe down-fired lean coal boiler uses the original tertiary air moved down, the secondary air jet angle of the A layer set to 20° downdip, the secondary air F layer and tertiary air set to 20° and 30° downdip, and separated over-fire air placed in the upper furnace at a 20% ratio with a 30° jet angle.","confidence":0.98,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_6d2568bd44dc41cee697bcbdc59143d9"},{"public_id":"cl_eb793bb04628ddc4e9ee8f85be731bfe","status":"active","text":"Exhaust gas temperature decreased from 1387 K to 1369 K, while unburned carbon content increased by 0.24% and overall boiler efficiency remained nearly constant.","confidence":0.97,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_eb793bb04628ddc4e9ee8f85be731bfe"},{"public_id":"cl_d8c0d224fa9b06b571bd309c6980b175","status":"active","text":"In situ measurement results are consistent with the numerical simulation predictions.","confidence":0.92,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_d8c0d224fa9b06b571bd309c6980b175"},{"public_id":"cl_7ff61fdc33e4484d8dbf25988e1ab844","status":"active","text":"NOX emissions were reduced from 1527 mg/m3 to 773 mg/m3 in the optimized system.","confidence":0.99,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_7ff61fdc33e4484d8dbf25988e1ab844"}],"concepts":[{"public_id":"co_066a27af4f25c38d89ccf89ef06a6d7c","status":"active","name":"NOX emissions","description":"Nitrogen oxide emissions produced by combustion and measured as an output of the boiler.","types":["outcome"],"aliases":["NOX"],"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/concepts/co_066a27af4f25c38d89ccf89ef06a6d7c"},{"public_id":"co_2a975306968ee97f01ce0e831dfb82bb","status":"active","name":"in situ measurement results","description":"Direct measurements taken on the operating boiler for comparison with simulation.","types":["measurement"],"aliases":["in situ measurements"],"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous 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