DMF精馏残渣与煤共成浆特性

Co-slurryability of DMF Distillation Residue with Coal

将DMF精馏残渣作为原料,与神华煤混合制备水煤浆,进行了成浆性、流变性和稳定性实验,探究添加剂种类和精馏残渣掺混量对浆体性能的影响。结果表明:精馏残渣水煤浆的成浆质量分数低于普通水煤浆,且随着掺混量的增加,成浆质量分数下降,当掺混量为11%时成浆质量分数降至61.20%;掺混DMF精馏残渣可以增强水煤浆的假塑性,掺混量越大,浆体假塑性特征越明显;与无残渣水煤浆相比,精馏残渣水煤浆的稳定性有所提高,当掺混量为11%时浆体可以稳定保存7 d以上;对比不同添加剂的分散与稳定效果,发现亚甲基双萘磺酸钠的效果最佳。

The distillation residue coal water slurry(DRCWS) was prepared by mixing the dimethylformamide(DMF) distillation residue with Shenhua coal, based on which, the slurryability, rheology and stability of the slurry fuel were experimentally tested to study the effects of additive category and residue amount on the property of the slurry. Results show that the concentration of DRCWS is lower than that of common coal water slurry(CWS);with the increase of the blending ratio of DMF distillation residue, the DRCWS concentration reduces, which drops to 61.20%, when the blending ratio is 11%. The mixing of DMF distillation residue would enhance the pseudoplasticity of the slurry;the higher the blending ratio is, the more obvious the pseudoplasticity would be. Compared with CWS, the stability of DRCWS is higher. When the blending ratio reaches 11% of the dry coal weight, the DRCWS can be stably stored for more than 7 days. By comparing the dispersion and stabilization effects of different additives, the dispersing agent NNO is found to have the best effects.