Sulfur recovery tail gas processing technology and system

Abstract

The invention relates to a sulfur recovery tail gas processing technology and system. After sulfur is recovered from an acid gas containing hydrogen sulfide through a Klaus+SCOT technology, the tail gas of sulfur production performs the heat exchange with intermediate temperature smoke of the outlet of a tail gas heat recovery boiler, so the fuel consumption of the tail gas boiler is saved, the waste-heat utilization efficiency is improved, the smoke temperature is further reduced, and the effective combination with a semi-drying desulfurization technology is realized. The smoke containing SO2is fed into a circulating fluidized bed desulfurizing tower, the SO2 and an absorbent perform the neutral reaction under the action of atomized water, and the SO2 content in the discharged smoke is less than 50 mg / Nm3. The desulfuration process of the technology and system has no wastewater discharge, no corrosion and no rime fog phenomenon, and the investment and operating cost is low.

Description

technical field [0001] The invention relates to the technical field of sulfur recovery tail gas treatment, in particular to a sulfur recovery tail gas treatment process and system. Background technique [0002] Environmental issues are a prominent issue that my country attaches great importance to. The GB31570-2015 "Petroleum Refining Industrial Pollutant Discharge Standard" implemented on July 1, 2015 stipulates that SO 2 The emission limit is 100mg / Nm 3 , compared to the SO 2 Emission concentration is not higher than 960mg / Nm 3 A reduction of -90% shows my country's determination to control environmental pollution. At present, domestic sulfur recovery tail gas treatment methods mainly include low-temperature Claus, selective catalytic oxidation and reduction absorption. The reduction and absorption process has strong adaptability to the Claus sulfur recovery unit, high purification degree, and the sulfur recovery rate can reach 99.8%. The SO in the flue gas after being...

AI Technical Summary

Problems solved by technology

Patent ZL201510401950.X adopts sodium-magnesium wet sulfur flue gas desulfurization technology, and the absorbent is Mg(OH) 2 And NaOH, both are wet desulfurization processes, which consume a lot of water, and the operating costs are relatively high, the system is easy to corrode, and the later operation and maintenance are complicated

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