Study Of Applying Foundation Of Double Staged And Deoxidized Low NOx Technology

The study of double staged and deoxidized technology by means of experimental, numerical simulation and reaction mechanism methods has been performed in this paper. Double staged and deoxidized technology is a combination of air staging, fuel staging and SNCR and an effective low NOx emission control measure.The experimental results of 1# boiler show that when full-load 350MW, O₂ volume fraction 4%, 100kNm³/h BFG is co-fired, no COG and Datong and Shenhun coal are co-fired, with the increase of OFA baffle's opening size from 0 to 80%, NOx emission decreases by 25.3%. When 320MW, O₂ volume fraction 4%, no BFG, 20kNm³/h COG is used as reburn fuel and only Datong coal is used, with the increase of OFA baffle's opening size from 40% to 80%, NOx emission decreases by 27.9%. When 300MW, O₂ volume fraction 4%, no BFG and COG and only Datong coal is used, with the increase of OFA baffle's opening size from 0 to 60%, NOx emission decreases by 27.3%. When 350MW, O₂ volume fraction 4%, no BFG, OFA baffle's opening size is 60%, with the amount of reburn fuel COG increasing from 25kNm³/h to 35kNm³/h, NOx emission decreases by 15.6%. When O₂ volume fraction 4%, no BFG, COG 20kNm³/h and OFA baffle's opening size is 60%, with the increase of operating load from 320MW to 340MW, NOx emission increases by 4.3%. Consequently, applying air staging, adding OFA's using amount, applying fuel staging, adding reburn fuel COG's amount and decreasing operating load can help reduce NOx emission. The experimental results of 2# boiler show that using pulverized-coal as the only fuel and full-load 350MW, with the increase of O₂ volume fraction from 3% to 5%, NOx emission increases by 36.2%. On the condition of O₂ volume fraction 4%, with the increase of operating load from 210MW to 350MW, NOx emission increases by 83.3%. When O₂ volume fraction 4%, keeping operating load invariable but using different layer's burners, NOx emission results are different. When 15%BFG is co-fired, with the increase of operating load from 280MW to 350MW,...