SWSR-8 pressurization sulfur recovery process

Abstract

The invention belongs to the field of sulfur recovery, and particularly relates to an SWSR-8 pressurization sulfur recovery process. The process comprises the steps that acid gas enters a sulfur making furnace, H2S is subjected to a high-temperature Claus reaction and converted into sulfur, and sulfur enters a two-stage converter to conduct two stage catalytic conversion for recovering sulfur; sulfur making tail gas enters a hydrogenation reactor, under the action of a hydrogenation catalyst, SO2 and COS are reduced to H2S through hydrogenation hydrolysis, reduced H2S gas is absorbed with an MDEA solution, and after purified tail gas recovers heat through incineration, flue gas is exhausted to the atmosphere through a chimney, wherein the pressure of acid gas entering the sulfur making furnace ranges from 90 kPa(g) to 120 kPa(g), and the pressure of the sulfur making furnace ranges from 90m kPa(g) to 120 kPa(g). The pressure of cooling and heat exchange equipment such as a sulfur making waste heat furnace, a first stage sulfur condenser, a second stage sulfur condenser, a third stage sulfur condenser, a steam generator and a tail gas waste heat boiler is higher than that in the prior art, the total heat transfer coefficient is increased, the occupied area is decreased, catalytic and absorption reactions can be conducted conveniently, the sulfur recovery rate is increased, and SO2 discharge is reduced.

Description

technical field [0001] The invention belongs to the field of sulfur recovery, and in particular relates to a SWSR-8 pressurized sulfur recovery process. Background technique [0002] At present, the domestic sulfur recovery and tail gas treatment technology adopts the Claus sulfur recovery process of high temperature thermal reaction and two-stage catalytic reaction, and the sulfur tail gas contains a small amount of H 2 S, SO 2 , COS, S x And other harmful substances, the discharge after direct incineration cannot meet the environmental protection requirements stipulated by the state. Sulfur recovery tail gas treatment methods mainly include low-temperature Claus method, selective oxidation method, and reduction-absorption method. The hydrogenation reduction absorption process is to recover sulfur from the elements S and SO in the tail gas 2 , COS and CS, etc., under a very small hydrogen partial pressure and extremely low operating pressure (about 0.01MPa ~ 0.06MPa), u...

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Problems solved by technology

[0003] For the device adopting the Claus sulfur recovery and hydrogenation reduction absorption process, the specifications of each equipment and process gas pipeline are determined according to the pressure drop of the whole device at 40-50kPa. In order to meet the requirements of low pressure drop, the equipment and pipeline specifications are relatively large. Generally, the acid gas pressure that can be provided by the upstream device is 90-120kPa(g), the acid gas pressure is not fully utilized, and the investment and floor area of ​​the device increase accordingly