Research And Application Of Oil-coal-water Slurry Manufactured With Oily Sludge

Oil sludge is one kind of pollutant during oil field exploitation and oil refining. At the sametime, it restricts the improvement of oil field environment quality. It has become a greatproblem for petroleum and petrochemical industry to dispose the oily sludge properly andscientifically. In this paper, the oil-coal-water was prepared by reducing viscosity of the oilysludge and adding it to the coal-water slurry, and the effect of the addition of small amount ofoily sludge on the gasification of water-coal slurry was investigated. The main researchcontents focus on the following aspects:(1) The experiments on viscosity reduction of the oily slurry, i.e., the blend of oily sludgewith viscosity reducer with a certain concentration. The results indicate that good viscosityreducing effect can be achieved when OP-10, AES and SDS are selected as the compoundviscosity reducer (The amount of viscosity agent is0.5%,0.1%and0.3%, respectively).(2) The preparation of water-coal slurry and oil-coal-water slurry. Oil-coal-water slurry isprepared by mixing viscosity reduced oily sludge with certain concentration coal-water slurry.Slurry property and the relationship of viscosity with temperature are studied afterwards. Theresults demonstrate that the low-viscosity and stable coal-water slurry can be obtained whenPFH additives and sodium carboxymethyl cellulose were used as dispersing agent andstabilizer, respectively; the oil-coal-water slurry shows a low viscosity of565mPa s, goodstability, no stratification after placed for a long time when the additive amount of viscosityreduction oily sludge is25%, and it has high stability; the viscosity of oil-coal-water slurrydecreases gradually with the increase of temperature.(3) The combustion characteristic of the coal, coal-water slurry and oil-coal-water slurrywere studied using TGA tests, and the gasification possibility of oil-coal-water slurry preparedby adding a small amount of oily sludge in water-coal slurry was speculated. The results showthat the kindling point of oil-coal-water slurry is lower than that of water-coal slurry, and separation and combustion of volatile is faster; the combustible index and combustioncharacteristic index declined slightly. In general, the combustion characteristic ofoil-coal-water slurry and water-coal slurry basically are similar; when adding3.22%of oilysludge through the analysis of moisture, ash content and oil content.(4) In this paper, based on the mature preparation process of water-coal slurry, a staticmixer was installed before the section of gasifier, then, the oil-coal-water slurry andwater-coal slurry were mixed at a certain proportion in the static mixer; after intensive mixing,the mixture was added into the gasifier. Even if the oil-coal-water slurry preparationtechnology is simple, easy operation, and also save the equipment investment cost.Oil-coal-water slurry was prepared by the addition of viscosity reduction processed oilslurry to water-coal slurry. The use of water-coal slurry not only saves coal tar and diesel, butalso realizes the minimization, harmlessness, recycling utilization of oil slurry. Moreover, itprovides a new way and idea to handle with oil slurry.