High-sulfur tail gas treatment system and technology

Abstract

The invention provides a high-sulfur tail gas treatment system and technology. The high-sulfur tail gas treatment system comprises a tail gas incineration unit and a flue gas waste heat recovery unit.The tail gas incineration unit comprises a combustor and an incinerator. The combustor and the incinerator are connected through a flange or in a welding mode. The mixed gas of high-sulfur tail gas,fuel gas and combustion air is burnt in the incinerator, and then high-temperature flue gas is discharged and enters the flue gas waste heat recovery unit. The flue gas waste heat recovery unit is setas multi-stage waste heat recovery facilities, and comprises a medium-pressure steam superheater, a steam generator, an energy-saving heat exchange facility and an air preheater. The steam superheater is connected with the incinerator, the steam generator is connected with the medium-pressure steam superheater, and the air preheater is connected with the tail end of the energy-saving heat exchange facility. According to the high-sulfur tail gas treatment system and technology, due to the design of multi-stage air distribution and tail gas flow separation of the incinerator, the emission indexrequirement can be met. Meanwhile, the equipment structure and materials of the waste heat recovery unit are optimized, and therefore the low-temperature acid dew point corrosion is avoided, and thelong-period stable operation is guaranteed.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a high-sulfur tail gas treatment system and process. Background technique [0002] For a conventional Claus or Super Claus sulfur recovery unit, a tail gas incinerator is equipped at the end of the device to make the H contained in the tail gas 2 S, COS, S, etc. are completely incinerated to generate SO 2 , due to the low calorific value of the combustible components in the Claus tail gas, fuel gas needs to be added to the tail gas incinerator to maintain combustion, and the heat released during the combustion of fuel gas and air is used to make H 2 S, COS, S, etc. are converted into SO 2 , CO converted to CO 2 , the flue gas after incineration usually recovers part of the heat through the waste heat boiler and produces medium-pressure steam by-product. A large amount of waste heat is not fully utilized, resulting in waste of heat. [0003] In the existing Claus su...

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Problems solved by technology

[0005] In view of this, the present invention aims to propose a high-sulfur tail gas treatment system and process to solve the poor incineration effect of the tail gas treatment unit of the Claus sulfur recovery unit in the prior art, and the H in the flue gas 2 S, NOx, and CO are not up to standard, high energy consumption, low utilization rate of waste heat, high concentration of SO in flue gas 2 For problems such as low-temperature acid dew point corrosion caused by heat exchange equipment

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