Catalyst combination process of sulfur recovering device

Abstract

The invention relates to a catalyst combination process of a sulfur recovering device, belonging to the technical field of sulfur recovery, and comprising a combustion furnace, a primary clotz reactor and a secondary clotz reactor connected in series with each other. The catalyst combination process is characterized in that: behind the secondary clotz reactor, a selective hydrogenation reduction reactor, a selective oxidation reactor and two absorption desulfurizing towers connected in parallel are connected in series; a deoxygenation protection-type sulfur recovery catalyst is filled in the upper part of the primary clotz reactor, and a TiO2 sulfur recovery catalyst is filled in the lower part; an auxiliary agent type sulfur recovery catalyst is filled in the secondary clotz reactor; a SO2 selective reduction catalyst is filled in the selective hydrogenation reduction reactor and selectively reduces the SO2 into elemental sulfur; H2S selective oxidation catalyst is filled in the selective oxidation reactor and selectively oxidizes the H2S into elemental sulfur. In the invention, the recovery rate of sulfur is high, and the tail gas after desulfuration can completely reach the national discharge requirement of GB16297-1996.

Description

technical field [0001] The invention belongs to the technical field of sulfur recovery, and in particular relates to a catalyst combination process of a sulfur recovery device. Background technique [0002] Sulphides in crude oil or coal are converted to H during processing 2 S, and H 2 S is a highly toxic substance, which has a great poisonous effect on the human body and the environment. It must be treated in a harmless manner. The most suitable process is the sulfur recovery process. [0003] The acid gas in the refinery mainly comes from catalytic dry gas desulfurization, coking dry gas desulfurization, sewage gas stripping tower gas, hydrotreating unit desulfurization and other devices. The main processing flow of sour gas in refinery is: [0004] Sulfur in crude oil→petroleum processing (atmospheric and vacuum)→gasoline\kerosene\diesel→hydrofining→H 2 S → sulfur recovery → sulfur [0005] In a chemical plant using coal as raw material, the sour gas processing flow...

AI Technical Summary

Problems solved by technology

[0018] The biggest disadvantage of this process is the large one-time investment. The investment in the tail gas hydrotreating unit is 1.5 times the investment in the previous sulfur recovery unit, and due to the need for hydrogenation, amine absorption, amine desorption and other operations, the consumption of H2 and MDEA amine solution is required. As well as steam for regeneration, the operating cost of the device is high. For a 50,000-ton / year sulfur recovery device, the annual operating cost is about 25 million yuan

Moreover, the tail gas hydrogenation unit itself does not produce any economic benefits

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