The residue pump is mainly composed of a pump body, a pump cover, a gear, a shaft seal and a gland. The pump has the advantages of high pressure, good performance of conveying residual oil and waste oil, hard surface of the tooth surface, special treatment and torsion resistance. Residue pump is the most important feature of the pressure, in order to achieve this feature, the residue pump gear material than ordinary kcb gear pump is better, smaller gear clearance, back and forth plate is made of steel, the other can also be based on the specific selection of stainless steel Material. Residue pump for conveying solid particles and fibers, non-corrosive high temperature liquid medium temperature up to 250oC, viscosity of 5-1500cst. Due to overweight residue components and contains more impurities and polymers, so that the washing line is blocked and cause mechanical seal damage, it must choose a suitable washing liquid. According to the ethylene process, the mixed diesel component in the E-DA103 column will be mixed with the residual oil to produce the final product. We consider it more appropriate to use mixed diesel as the rinse solution for the following reasons: (1) The mixed diesel component is clean and Residue good compatibility. (2) The pressure and temperature of the mixed diesel components are suitable for the residue pump conditions. Mixing diesel oil fraction above 300 ℃, while the residue of the working temperature of 170 ℃, mixed with diesel fuel for flushing will not be vaporized, effectively avoiding the pump cavitation. E-DA103 bottom circulating pump E-GA105 pump outlet pressure of 0.54MPa, the outlet temperature of 80 ℃. The pressure in the sealed chamber of the E-GA103 pump can be estimated by the following formula: P = (inlet pressure + outlet pressure) /2=0.438MPa The rinse liquid pressure is about 0.1 MPa greater than the pressure in the sealed chamber and is well suited to direct E-GA105 pump outlet can be introduced into the sealed chamber. (3) It is the most economical to mix a diesel component as a rinse solution, adding almost no use to any inputs as this portion of the diesel component eventually mixes with the residue.
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