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The aqueous solution absorbs H2S gas and the ferric ions (Fe3+) oxidize divalent sulfur. The total absorption and oxidation reaction equation is:
H2S(g) + 2Fe3+(L) → 2H+(L) + S↓+ 2Fe2+(L)
The complex ferrous ion solution is directly contacted with the air for gas-liquid reaction, then the oxygen in the air is used to oxidize the complex ferrous ions in the aqueous solution into complex ferric ions. The regeneration reduction reaction equation is:
1/2O2(g) + H2O(L) + 2Fe2+(L) → 2OH-(L) + 2Fe3+(L)
The iron ions are not consumed in the reaction. The iron ions serve as the catalyst for the reaction of hydrogen sulfide and oxygen.
Since the treated gas phase contains carbon dioxide (CO2), especially at high pressure, carbon dioxide is very soluble in water and will form bicarbonate (HCO3-) and carbonate (CO32-), followed by a side reaction to reduce the pH value of the aqueous solution. In order to stabilize the pH value of the aqueous solution, sodium hydroxide needs to be added to the system.
The system uses the redox properties of the alkaline complex iron catalyst to absorb H2S in the acidic gas. H2S is directly oxidized by the complex iron to generate elemental sulfur, and the complex iron is converted into complex ferrous iron. Then air is blown into the regeneration sedimentation tank to oxidize the complex ferrous iron in the alkaline absorbent, so that the complex ferrous iron in the absorbent is converted into complex iron for regeneration and reuse. At the same time, the sulfur is precipitated and separated in the regeneration sedimentation tank to form sulfur slurry, and the sulfur slurry is sent to the filter to be dehydrated into sulfur cakes.
The hydrogen sulfide-containing gas is pressurized by the booster fan, and then passes through the desulfurization tower from bottom to top, and contacts the lean liquid pumped by the lean liquid pump in reverse.
After removing the hydrogen sulfide, it passes through the steam-water separator at the top of the desulfurization tower and then exits the device.
The trivalent iron in the solution at the bottom of the desulfurization tower absorbs the hydrogen sulfide in the natural gas to become divalent iron, and the solution becomes sulfur-containing rich liquid and enters the regeneration tank through the rich liquid pump, and is oxidized with the air blown in by the oxidation fan.
The divalent iron in the rich liquid is oxidized by the oxygen blown in by the regeneration fan to become a trivalent iron lean liquid. At the same time, the elemental sulfur in the regeneration tank grows layer by layer in each compartment and is deposited to the bottom of the cone of the sedimentation tank due to its weight.
The lean liquid separated from the sulfur in the upper layer is transported to the high-efficiency desulfurization tower by the lean liquid pump for desulfurization. The bottom sulfur slurry is sent to the bottom of the sedimentation tank by the sulfur slurry pump for circulation disturbance to prevent blockage.
When the sulfur content reaches about 5%, the other way is opened to enter the plate and frame filter press for solid-liquid separation. The liquid is recovered to the system, and the sulfur paste can be sold after purification.
(1) The process is simple. The one-step process can quickly oxidize hydrogen sulfide directly to sulfur.
(2) The complex iron has high sulfur capacity. The system has anti-fluctuation ability and the outlet sulfide is stable.
(3) The complex iron catalyst can be recycled and reused without side reactions. Only a small amount of supplementation is required and the treatment cost is low.
(4) The complex iron catalyst has high selectivity, low by-salt production and long service life of the agent.
(5) The sulfur capacity of the desulfurizer circulating fluid is not affected by carbon dioxide. The working sulfur capacity is as high as 8.5g sulfur/L, which is higher than similar technologies.
(6) It can remove organic sulfur COS and mercaptans.
(7) The desulfurization equipment is small in size and can be effectively skid-mounted with low installation cost.
(8) The complex iron catalyst is highly safe and has good environmental benefits.
| NO | Volume(M3) | Diameter(M) | Height(M) | Anti-corrosion method | Stirring power (KW) | Mixer material |
| 1 | 300 | 7.64 | 7.2 | Electrophoresis/enamel | 5.5 | 304/carbon steel anticorrosion |
| 2 | 400 | 8.41 | 7.8 | Electrophoresis/enamel | 7.5 | 304/carbon steel anticorrosion |
| 3 | 500 | 9.17 | 8.4 | Electrophoresis/enamel | 7.5 | 304/carbon steel anticorrosion |
| 4 | 600 | 9.94 | 8.4 | Electrophoresis/enamel | 11 | 304/carbon steel anticorrosion |
| 5 | 800 | 10.7 | 9.6 | Electrophoresis/enamel | 11 | 304/carbon steel anticorrosion |
| 6 | 1000 | 11.46 | 10.8 | Electrophoresis/enamel | 15 | 304/carbon steel anticorrosion |
| 7 | 1500 | 12.99 | 12 | Electrophoresis/enamel | 18.5 | 304/carbon steel anticorrosion |
| 8 | 2000 | 13.76 | 14.4 | Electrophoresis/enamel | 18.5 | 304/carbon steel anticorrosion |
| 9 | 3000 | 15.29 | 16.8 | Electrophoresis/enamel | 22.5 | 304/carbon steel anticorrosion |
| 10 | 3500 | 16.82 | 16.8 | Electrophoresis/enamel | 25 | 304/carbon steel anticorrosion |
| 11 | 4000 | 17.58 | 17.4 | Electrophoresis/enamel | 25 | 304/carbon steel anticorrosion |
| 12 | 5000 | 18.34 | 19.8 | Electrophoresis/enamel | 30 | 304/carbon steel anticorrosion |
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