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为了研究共热解对生物炭中碳氮固定的协同效应,利用管式固定炉开展了不同热解温度(300~700℃)下的污泥与稻秆单独热解及其共热解(泥秆质量分别为1∶3、1∶1、3∶1)试验研究.结果发现,污泥和稻秆共热解并不是两种物料单独热解贡献的简单叠加.共热解对生物炭产率无协同效应,但对固定碳产率的协同性受共热解条件影响较大.在相同热解温度下,1∶3和3∶1泥秆比共热解生物炭中的碳和氮含量协同量化值均明显大于1∶1泥秆比下的协同量化值,碳和氮元素含量协同量化值分别在热解温度和泥秆比为(400℃、1∶3)与(400℃、3∶1)时达到最大值12.43%与40.65%.碳和氮固定率协同量化值随热解温度的升高而增加,最大分别为53.77%~56.13%和38.30%~39.12%,说明共热解可显著提高生物炭中碳和氮元素的固定水平.除3∶1泥秆比共热解生物炭中H/C原子比大于理论值,对降低生物炭的芳香度与饱和度具协同作用外,其他共热解条件下的H/C、(O+N)/C、O/C原子比均小于理论值,对提高生物炭的稳定性具明显的协同促进作用.污泥与稻秆在泥秆比1∶3、1∶1与3∶1下共热解,提高协同效应的方式分别为促进脱氧去氢反应、去氢反应与脱氧反应.该研究结果可为生物炭在碳氮封存减排中的应用提供新的工艺途径.
In order to study the synergistic effect of co-pyrolysis on the immobilization of carbon and nitrogen in biochar, sludge and straw alone pyrolysis and co-pyrolysis at different pyrolysis temperature (300 ~ 700 ℃) Straw quality were 1: 3, 1: 1, 3: 1 respectively) .The results showed that the co-pyrolysis of sludge and rice straw was not a simple superposition of the contribution of the two materials alone.The total pyrolysis of biochar yields But there was no synergistic effect, but the synergistic effect on the fixed carbon yield was greatly affected by the total pyrolysis conditions.At the same pyrolysis temperature, the ratios of carbon and nitrogen in the co-pyrolysis biochar at the ratio of 1: 3 and 3: 1 The synergistic quantification values of contents of carbon and nitrogen were significantly higher than those of 1: 1 sludge stalk, respectively. The synergistic quantification values of carbon and nitrogen contents at pyrolysis temperature and sludge stalk ratio (400 ℃, 1: 3) and (400 ℃, 3: 1) reached the maximum value of 12.43% and 40.65%, respectively.The synergistic quantification values of carbon and nitrogen fixation rate increased with pyrolysis temperature increasing up to 53.77% -56.13% and 38.30% -39.12%, respectively, Solution can significantly increase the fixed level of carbon and nitrogen in biochar.In addition to the ratio of H / C atomic ratio of coke 3: 1 than that of co-pyrolytic biochar is greater than the theoretical value, (O + N) / C, O / C atomic ratio under other co-pyrolysis conditions are all less than the theoretical value, which has a significant synergistic effect on improving the stability of biochar The sludge and rice straw were pyrolyzed at a ratio of 1: 3, 1: 1 and 3:1 of sludge to enhance the synergistic effect of promoting deoxygenation dehydrogenation reaction, dehydrogenation reaction and deoxygenation reaction, respectively Biochar in the carbon and nitrogen storage and emission reduction in the application of new processes.