Glycol regenerator

An excessive circulation rate may overload the reboiler and prevent good glycol regeneration. The heat required by the reboiler is directly proportional to the circulation rate. Thus, an increase in circulation rate may decrease reboiler temperature, decreasing lean glycol concentration, and actually decrease the amount of water that is removed by the glycol from the gas. Only if the reboiler temperature remains constant will an inc.rea,se in circulation rate lower the dew point of the gas. 

Various glycol regeneration methods were considered, such as direct-fired glycol reboilers, o direct-fired indirect hot oil system, electricol heating ond waste heat recovery. A direct-fired in-direct hot oil system was finally selectd because it provided a safe, well proven regeneration system which could be accommodated within the platform space limitations. 

For a conventional glycol regeneration system the maximum leon glycol concentration attainable without stripping gas is 98.5%. Table 2 shows that the reduction in reboiler heat lood is relatively small when using the leoner glycol. This is particularly so for systems operating ot lower process gas inlet temperatures to the contactor. 

TRAYS IN GLYCOL CONTACTOR GLYCOL REGENERATION HEAT LOAD (MW) CONTACTOR LEAN TEG CONCENTRATION (% Wt) OPERATING TEMPERATURE (°c) 98.4 98.7 99.0 99.3 99.5 ... 

One common example of firing on the tube side of a heater is the glycol-regeneration boiler, shown in Fig. 21.7. This type of heater will typically have a high excess 02, to prevent high flame temperatures, which could overheat the fire tube. Also, the fire tube is kept submerged in liquid, to prevent tube overheating. 

Moderate foaming, e.g., oil absorbers, amine and glycol regenerators 0.85... 

The gas off the glycol regenerator is cooled to condense some of the water. The remaining vapor are returned to the suction of the compressor using a vapor recovery unit (VRU). 

Moderate foaming, as in oil absorbers, amine, and glycol regenerators 0.85 Heavy foaming, as in amine and glycol absorbers 0.73... 

Moderate foaming, as in oil absorbers and amine and glycol regenerators Heavy forming, as in amina and glycol absorbers Severe forming, as in methyl ethyl ketone units Foam-stable systems, as in caustic regenerators... 

A misleading level indication due to oil accumulation in the column base caused severe operating problems in many aqueous services. In several cases, liquid level in amine towers rose above the bottom feed inlet and caused column flooding, while the level instrument indicated normal level (238). In another case (238), a glycol regenerator performed poorly when the liquid level in a kettle draw compartment rose above the overflow weir, while the level instrument indicated normal level (238). 

In mildly corrosive applications it often pays to fabricate the packing support from stainless steel, even when carbon steel is satisfactory for the packing. This prevents localized corrosion that can puncture holes in the support, resulting in downward migration of packings. One service where this technique is commonly applied is in natural gas plant glycol-regeneration stills (84). 

Moderate foaming, e.g., oil absorbers, amin and glycol regenerators Heavy foaming, e.g., amin and glycol absorbers Severe foaming, e.g., MEK units Foam-stable systems, e.g., caustic regenerators... 

Notes CRA = corrosion resistant alloy CS = carbon steel MEG regen. = glycol regeneration. 

Glycol pump deficiencies (gas drying), 443-445, 455 reduced circulation, 443-444 regeneration temperature, 444 leaking feed-effluent exchanger, 444-445 Glycol regeneration temperature, 455... 

Circulation rate of glycol Reboiler BTU rating Effect of superheated gas Contactor tray capacity Glycol regeneration temperature vs contactor temperature Stripping gas... 

Dissolved oil is also called "soluble oil," representing all hydrocarbons and other organic compounds that have some solubility in produced water. The source of the produced water affects the quantity of the dissolved oil present. Produced water derived from gas/condensate production typically exhibits higher levels of dissolved oil. In addition, process water condensed from glycol regeneration vapor recovery systems contains aromatics including benzene, toluene, ethyl benzene, and xylenes (BTEX) that are partially soluble in produced water. 

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