Burner for main burning furnace of sulfur recovery unit

Abstract

The invention relates to a burner for a main burning furnace of a sulfur recovery unit of a process for natural gas sulfur recovery and tail gas treatment. The burner adopts a high swirling device to form swirling jet flows in the furnace and has the characteristics of high-efficiency mixing, stable burning, energy saving and consumption reduction. The technical scheme is that the burner consistsof an air swirling device, a sour gas inlet device and a burner attachment, wherein the air swirling device is provided with an air inlet, an air chamber outer cavity, an air chamber porous plate, anair chamber inner cavity and an air guide vane; the sour gas inlet device comprises a central sour gas inlet and an outer ring sour gas inlet; the central sour gas inlet is provided with a sour gas inlet pipe, an annular chamber, a sour gas swirling vane and a conical nozzle; the outer ring sour gas inlet is provided with an outer ring sour gas inlet pipe, a sour gas chamber outer cavity, a sour gas chamber porous plate and an outer ring sour gas spout; and the burner attachment is provided with a burning torch inlet, a fuel gas inlet, a premixing chamber and a shell. The burner can improve the total sulfur production rate in the furnace, reduce the pressure drop loss in the furnace, and is used for the sulfur recovery unit.

Description

technical field [0001] The invention relates to a burner for a main combustion furnace of a sulfur recovery device used in natural gas purification, sulfur recovery and tail gas treatment processes. Background technique [0002] In the Claus sulfur recovery process, the efficient mixing of gases in the main combustion furnace is an important guarantee for the powerful combustion in the furnace. In the general process, about 1 / 3 of the H in the main combustion furnace 2 S burns to SO 2 , the remaining H 2 S and product SO 2 Elemental sulfur is further generated. [0003] 2H 2 S+3O 2 =2SO 2 +2H 2 O (1) [0004] 2H 2 S+SO 2 =3 / 2S 2 +2H 2 O (2) [0005] The burner is the core component in the main combustion furnace. Most active burners use high swirl devices to achieve strong combustion of gas in the furnace. The structure of the active burner can basically realize the strong combustion of the gas in the furnace, but there are still the following deficiencies in...

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Problems solved by technology

The structure of the active burner can basically realize the strong combustion of the gas in the furnace, but there are still the following deficiencies in the secondary mixing of the gas in the furnace, the temperature rise rate of the main jet and the energy consumption of the device: 1. The structural characteristics of the burner cause the main jet to be Air-enveloped acid gas flow form, which will lead to H at the center of the main jet after oxygen consumption is complete 2 Excessive S, SO at the boundary layer around the jet 2 excess

This mixing process is relatively slow, which is unfavorable to the formation of elemental sulfur; 2. Due to the high flow rate of the main jet and the slow mixing speed of the gas inside and outside the jet, the temperature rise of the main jet is slow

Especially in the furnace acid gas flow rate or H 2 When the S content decreases, the temperature rise rate of the main jet will be slower, which will have a greater impact on the combustion stability and temperature field distribution in the furnace; can be more

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