Refinery stack, flare, and sulfur recovery area at dusk — Stack, flare, and sulfur-recovery area.

Product information

Environmental emissions

The permit is part of the process design. A gasoline train that makes on-spec product and misses the stack or the fence line is not finished work. Fired heaters, flares, tank vapors, sour water, and sulfur recovery are tied to the same heat and material balance as the columns and reactors.

We specify emissions equipment with the unit, not after the plot is frozen. Ducts, vapor recovery, amine, and sulfur plants need plot space, utilities, and metallurgy that the crude and product sides already assumed. Retrofit is possible; it is also slower and more expensive than designing the path once.

When the crude slate gets heavier or summer RVP rules tighten, the emissions system sees it first as more H2S, more light ends, and more heater duty. Hardware that cannot follow those swings becomes a constraint on gasoline rate.

Fired heaters and stack with emissions monitoring — Fired heaters, stacks, and continuous emissions monitoring.

Fired heaters and stacks

Atmospheric heaters, vacuum heaters, and reformer cabins are the largest NOx and CO sources on many gasoline trains. Burner selection, air preheat, and stack monitoring have to match the fuel gas the unit actually burns, including the hydrogen-rich streams that appear when reforming is pushed for octane.

We treat the stack as an extension of the heater, not a civil afterthought. Ducts, platforms, and analyzer taps are placed so a permit test is a routine reading, not a shutdown. When a plant needs lower NOx, the fix is usually the burner and the fuel system together, not a taller stack.

Tank vapor recovery and flare knockout drums — Tank vapor recovery, flare knockout, and header tie-ins.

Tanks, vapors, and flare

Gasoline blending tanks breathe. Summer RVP, filling rates, and roof condition decide how much hydrocarbon leaves as vapor. Vapor recovery units, conservation vents, and flare headers have to take that load without lifting a relief valve every time a blender starts a batch.

The flare is the last door, not the plan. Knockout drums, seal drums, and header hydraulics are sized for the combination of tank breathing, unit upsets, and planned depressuring. We draw those lines with the product tanks, because the same light ends that ruin RVP are the ones that light the flare.

Amine treater and sulfur recovery unit — Amine treating and sulfur recovery after sour naphtha and gas.

Sulfur, sour water, and wastewater

Sulfur stripped from naphtha and fuel gas has to land somewhere that is not the stack. Amine units, sulfur recovery, and tail-gas treating sit on the same hydrogen and steam balances as the hydrotreater. Sour-water strippers take the water that desalting and condensing create before it reaches the wastewater plant.

We specify these packages as process equipment with a permit job. Vessel metallurgy, incinerator duty, and effluent quality are set against the sourer crude the feedstock side is already allowed to run. If sulfur recovery cannot keep up, gasoline rate falls even when the reformer is healthy.