Nitrogen Conversion During Rapid Pyrolysis Of Coal, Aquatic Biomass And Their Blends

Pyrolysis of three kinds of the different rank of coal, four nitrogen model compounds of pyrrole, pyridine, carbazole, acridine, biomass of blue-green algae and water hyacinth together with three different ratios of biomass in Shenfu and Zunyi coal were carried out in a high-frequency furnace. The yields and influencing factors of HCN, NH3 and Char-N were analyzed, the thesis included the following three parts:(1) The yields of HCN during pyrolysis of lignite and bituminous decrease with an increasing heating rate, while HCN yield of anthracite increases and then to be constant with an increasing heating rate. NH3 yields of lignite and bituminous increase, while NH3 yield of anthracite decrease with an increasing heating rate. HCN yields of lignite and bituminous decrease, while HCN yield of anthracite increases with an increasing temperature. NH3 yields of lignite, bituminous and anthracite increase and then decrease with an increasing temperature. NH3 was the main nitrogen-containing product during the pyrolysis of pyrrole and carbazole, while HCN was the main nitrogen-containing product during the pyrolysis of pyridine and acridine.(2) The main nitrogen form in blue-green algae and water hyacinth is protein, NH3 is the main nitrogen-containing pollutant during pyrolysis, a small mount of HCN also is formed, lots of N. NH and NH2 are formed during decomposition of amino acid, a great amount of H are also formed during pyrolysis of blue-green algae and water hyacinth, so NH3 can be easily formed during pyrolysis of blue-green algae and water hyacinth leading a high yield of NH3. The yields of HCN and Char-N decrease with an increasing temperature, while the yields of NH3 increase and then decrease with the increased temperature.(3) HCN can be reduced to NHi and NHi finally converted to N2 during co-pyrolysis of blue-green algae and water hyacinth with Shenfu coal and Zunyi coal because of higher mount of CaO existed in blue-green algae and water hyacinth, so HCN and NH3 yields in the experimental are lower than that of calculated value. The yields of HCN decrease with the increased temperature, while NH3 yields increase and then decrease with an increasing temperature.