The Fundamental Research On Preparation Technology Of New Type Coal Tar Pitch Water Slurry

Coal tar pitch water slurry (CTPWS) is a new type of clean fuel that is prepared in virtueof the preparation technology of coal water slurry (CWS). CTPWS is more innoxious,environmental and efficient than other slurry fuels. This paper covers five parts as following:1. The relationships between the dispersant dosage, integrated use and concentration andviscosity of CTPWS have been studied by testing and comparing the performance of severaldispersants including usual dispersants in CWS preparation and one dispersant which wasmade in our lab. 2. The effects of different feeding and grinding method of coal tar pitch (CTP)on the viscosity and size distribution of CTPWS and the CTPWS grinding kinetics with theuse of dispersant were investigated to formulate the equations of grinding kinetics for CTP 3.The effects of different stabilizers on the CTPWS stability and their actions during thepreparation of CTPWS were also studied. 4. Three types of CTPWS dispersants have beensynthesized and the technologies of synthesis were optimized.The effects of various reactionconditions during synthesizing process on dispersants performance have been analyzed. 5.CWS, raw CTPs and CTPWSs made from high temperature and mid temperature CTP havebeen analyzed by TG-DTA-DTG method respectively, to predict their thermal and combustionproperties.The experimental results showed that the CTP from Laiwu is suitable to produce CTPWSwith presence of proper dispersant. Comparing. with others, two dispersants (sulphonatedmelamine urea formaldehyde resin and polysulpHonated naphthalene with formaldehyde)have high dispersing performance.By applying suitable feeding and grinding method of CTP,good fluidity, low viscosity and high concentration CTPWS could be prepared. With presenceof MC or AZMN dispersant, the equations of grinding kinetics for CTP have been formulatedas following: R(t)=100exp[-(0.0244e^0.0109d)t^{(-0.2601·lnd+2.0393)}] R(t)=100exp[-(0.026e^0.0124d)t^{(-0.2728lnd+2.0663)}]The experimental results on CTPWS stability also showed that the addition of non-ionicsurfactants (0P-10 or Tween-80) was helpful to form "statically plastically construction" ofCTPWS. Moreover, the TG-DTA-DTG thermal analyses also proved the advantages ofCTPWS on burning performance.