Watch and analyze the questions
Thread Content
Let’s analyze what the problems are How to adjust? Project% Desorbed Gas Poor Gas Dry Gas Liquid Hydrocarbons Air 3.49 6.39 9.24 CO 0.28 1.35 0.48 Methane 2.14 21.67 20.27 CO2 0.66 1.28 1.22 Ethylene 5.27 10.91 8.43 Ethane 9.47 16.57 7.77 0 Propane 8.83 0.51 3.59 12.17 Propylene 46.01 2.24 4.39 46.07 Isobutane 4.11 1.08 1.19 16.33 n-Butane 0.73 0.22 1.27 2.49 n-Isobutylene 3.59 0.89 0.1 110.7 sec-Butylene 3.5 0.31 0.02 4.68 cis-Butylene 1.39 0.29 0.19 3.03 Isopentene 0.96 0.5 0.03 2.63 n-Pentene 1.53 0.04 0 1.53 Pentene 0.13 0 0 0 Hydrogen 0 35.25 41.8 / C6 0.15 0.42 / /
1. When the H/H2 ratio is high, the nickel catalyst needs to be passivated or replaced. 2. I don’t understand; isn’t poor gas the same as dry gas? If the dry gas is not dry enough, the absorption tower requires adjusted operation or modification of its trays. 3. The propylene content in liquefied gas is 46%, which is at a high level.
To build on what was said above, since the C5 content in liquefied gas is high, the operation of the stabilizer tower needs to be adjusted by lowering the temperature and increasing the reflux
There is an issue with the data for liquid hydrocarbons and n-isobutylene; it should be 11
The volume percentage of air in the dry gas is high; in the regeneration system, flue gas entrainment in the catalyst is severe, and the fluidization condition is poor.
(1) The desorbed gas contains 2.75% of components with C5 or higher, and there is a high content of liquid hydrocarbon components such as propylene; no C2 components were detected in the analysis of the liquid hydrocarbons, suggesting that over-desorption may have occurred. The temperature at the bottom of the desorption tower can be gradually and appropriately reduced. (2) The lean gas and dry gas contain a high proportion of components with molecular weights above C3; the proportion of such components in the dry gas reaches 10.78%. This severe insufficiency in absorption results in the dry gas not being truly dry, and it also contains some C5 components, indicating that the reabsorption tower is not effective either. The pressure in the reabsorption tower can be increased appropriately to enhance the absorption effect; the amount of supplementary absorption agent can be raised, as well as the volume of the lean absorption oil, in order to ensure effective absorption. The temperature at the middle stage of the absorption process and the temperature of the absorbent can be adjusted to lower the absorption temperature and thus maintain effective absorption. (3) A C5 content of 4.16% in the liquid hydrocarbons indicates problems with the operation of the stabilizer tower; the bottom temperature of the tower can be reduced accordingly, based on the 10% point of the stabilized gasoline ； Increase the top reflux to ensure an appropriate reflux ratio and properly control the top temperature ； Control the stabilizer tower pressure stably ； Feed below the stabilizer column can be used if necessary. (4) The hydrogen content in the dry gas reached 41.8%, indicating significant heavy metal contamination in the catalyst; it is possible to remove some of the equilibrium agents and increase the amount of new catalyst added ； Ensure the proper amount of passivator is added and maintain stability