Process for treating exhaust from sulfur recovery

Abstract

The invention relates to a process for treating exhaust from sulfur recovery. The exhaust from a sulfur condenser in a sulfur recovery process is subjected to heat exchange with process gas from a primary reactor in a primary process gas heat exchanger, is mixed with reductive gas and enters a hydrogenation reactor, so that almost all sulfur and sulfide in the exhaust can be converted into H2S; then, the exhaust is subjected to heat exchange with process gas of a secondary reactor in a secondary process gas heat exchanger for cooling, and flows through a three-stage sulfur condenser to generate low-pressure steam; the exhaust from the third-stage sulfur condenser is cooled in a condensation cooler, enters a vapor-liquid separator for vapor-liquid separation, and is pumped into a desulfurization unit; and the exhaust is delivered into a coke oven gas system or remelt gas system after H2S is removed to be lower than 10ppm. The process has the advantages of low operation cost, energy conservation and environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of recovery of coking chemical products, in particular to a sulfur recovery tail gas treatment process. Background technique [0002] At present, the sulfur recovery process in the coking industry has no tail gas treatment measures, and the tail gas is returned to the coke oven gas system. [0003] The sulfur recovery process in the coking industry usually consists of a combustion section and a one-stage and two-stage catalytic section. By controlling the H in the combustion section 2 The incomplete combustion ratio of S makes 1 / 3 of H 2 S generates SO 2 , H 2 S and SO 2 This produces elemental sulfur. To the catalytic section, under the action of the catalyst, H 2 S and SO 2 Stoichiometric reaction generates elemental sulfur; then condenses the generated gaseous sulfur into liquid sulfur for separation. [0004] In the sulfur recovery reaction, its progress is limited by the reaction temperature, ch...

AI Technical Summary

Problems solved by technology

Practice shows that, taking the scale of annual production of 3 million tons of coke as an example, the N 2 The content increases by 2-3%, and the energy consumption increases by about 200KW in the process of producing methanol and LNG

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