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Coal Black Liquor Slurry Preparation and Convertion it to Hydrogen in a Continuous Supercritical Water Reactor

Author: LiuJingYa
Tutor: LvYongKang
School: Taiyuan University of Technology
Course: Chemical processes
Keywords: Black liquor Lignite CWS Supercritical Water Hydrogen Synergies
CLC: TQ116.2
Type: Master's thesis
Year: 2011
Downloads: 77
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Abstract


Pulp and paper industry, black liquor is a black liquid waste generated in the process, our paper waste accounted for 10% of total industrial wastewater, is one of China's major source of environmental pollution. Forced by environmental stress, on paper waste comprehensive treatment is imperative. Black liquor lignin, hydroxy low molecular weight organic acids, salt etc with surfactant function, so you can directly use the black liquor instead of water coal slurry, and then gasification in supercritical water can be black harmful organic liquid into a clean hydrogen energy. This will not only effectively deal with the black liquor, reduce environmental pollution, but also can reduce the production cost of coal-water slurry to achieve the reuse of black liquor, bring good economic and social benefits. This paper aims to efficiently deal with the use of black liquor. First on the black liquor was measured characteristics were analyzed, and then the black liquor configured with Hangjinqi lignite coal slurry liquor excellent performance was investigated using different dilution factors of black liquor coal slurry made from the highest slurry concentration, rheology static stability, and additives on the properties of black liquor coal slurry. Finally, the use of supercritical water unique physical and chemical characteristics to black liquor coal slurry as raw materials in a continuous supercritical water reactor to produce hydrogen. Were investigated temperature, pressure, concentration, and coal slurry gasification of different materials on the impact. Main results are as follows: 1. Liquor characteristics measuring and coal preparation liquor solids in the black liquor higher than the literature values, respectively, of organic and inorganic total solids 66.79% 33.21%, organic matter content inorganic 2.011 times. 1ml lignin lignin acid precipitation 0.375g, 21.82% for the solids content. Total alkali content of 39.68g / 1, the effective alkali is 27.16 g / l. SO42-and S2-'s contents were 1.83% and 0.41%. The measured data and paper production enterprise statistics correspond to the indicators of black liquor production targets were within the normal range. Black liquor can be made with good performance and lignite coal slurry. 5-fold diluted black liquor coal slurry prepared the best overall performance, into a slurry concentration of up to 62.8%, with a yield pseudoplastic, and can stabilize more than 15 days. Dispersant and stabilizer, may significantly reduce the viscosity of coal slurry, but also improve the settling time. 2 black liquor coal slurry in supercritical water to produce hydrogen continuous temperature, pressure, supercritical water is the main influencing parameters, slurry concentration directly affects the large-scale hydrogen production. Black liquor slurry hydrogen in supercritical water continuous process, the temperature changes in the yield of hydrogen has a significant effect, the increase of the pressure promotes the formation of methane, the hydrogen yield was less affected. As the slurry concentration increases, the yield of hydrogen decreased. Three temperature on different materials in supercritical water to produce hydrogen continuous influence of temperature is conducive to separate black liquor gasification of lignite and, in particular, the hydrogen production rate increase for a significant role. The results of two separate weighted average gasification of black liquor coal slurry gasification with the results of comparison, the presence of black liquor lignite continuous gasification in supercritical water has obvious synergies, and as the temperature rises, enhance synergies.

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CLC: > Industrial Technology > Chemical Industry > Basic inorganic chemical industry > Industrial gases > Hydrogen
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