The Process Optimization For Coking Dry Gas Hydrogen-producing Unit Of Liaohe Petrochemical Company

This paper systematically discusses the importance of hydrogen in the oil refining industry, the sources of hydrogen and also the optimization and process principle of the hydrogen feedstock processed by the steam reforming of hydrocarbons method. Based on the case of the hydrogen-producing in Liaohe Petrochemical Company which using coking dry gas as the replacement of the natural gas, it has been proved that coking dry gas could be quite available and cheap feedstock for hydrogen process. Meanwhile we also analyzed the material consumption, energy consumption and conversion, usage and recycling levels to find the outstanding problems combining the calibration of device after transformation.Through technical demonstration and field practice for a range of issues such as the coke powder carrying, poor gas-liquid phase separation, serious aging equipment, waste of energy after transformation, we developed scientific and rational transformation and process optimization solutions and implemented. With the help of advanced technology at home and abroad, those problems exposed in the coking dry gas hydrogen-producing after the transformation got well resolved.From calculation of the calibration data after the device optimizing and the analysis and evaluation of energy use, it can be seen: the load rate is about 90%, unit consumption reached 1031.73 kilograms of standard oil per tons of hydrogen, oxygen content of the reforming furnace flue gas got reduced from above 6% to below 3.5%, thermal conversion efficiency of the furnace increased from 88% to more than 91% up to 92.32%, the fuel gas consumption dropped from 1.32 tons of fuel gas per tons to 1.13 tons of hydrogen fuel gas per tons of hydrogen, the energy transmission and conversion efficiency of device was 86.86%, energy recovery and utilization rate was 86.63%. we can come to the conclusions that the energy use is more reasonable. The absorption and regeneration of carbon dioxide in the two towers gas purification process has exceeded the design value, which limited the improvement of unit load. Thus we must redesign and calculate the two tower purification system and transform the unit parameters based on the actual working conditions. Only in this way, can we fundamentally solve the bottleneck problems of poor regeneration effect of benzene Phil solution and that absorption capacity was difficult to meet the load rate which the adjustment process required.