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Process and apparatus for the combustion of sulfur

A kind of equipment, air combustion technology, applied in the direction of chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of expensive, multi-level equipment complex price and so on

Active Publication Date: 2009-03-04
METSO OUTOTEC (FINLAND) OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the equipment structure is concerned, this multi-stage equipment is quite complicated and therefore expensive

Method used

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  • Process and apparatus for the combustion of sulfur
  • Process and apparatus for the combustion of sulfur
  • Process and apparatus for the combustion of sulfur

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Fig. 9 shows a process flow diagram of the present invention through which a sulfur dioxide-containing gas having a sulfur dioxide concentration of 12% by volume is obtained. For this process, each of the first to fourth embodiments of the sulfur combustion furnace described with reference to FIGS. 1-5 can be used.

[0060] Provide 60.04 tons of sulfur per hour to the combustion furnace 1, with the help of 14,030Nm 3 Primary air at 120°C / h introduces sulfur into the furnace in atomized form. 175,000Nm to the first section 5 of the furnace 3 / h is filled with ambient air at 120°C, and 152,518Nm is supplied to the second part 6 of the furnace 3 / h Provide ambient air at 120°C. The residence time in furnace 1 was less than 0.6 s in total and less than 0.2 s in the second part.

[0061] In the first section 5, a sulfur dioxide concentration of 20.5% is obtained at a combustion temperature of 1,700-1,800°C, while at the outlet of the second section 6 or at the inlet of t...

Embodiment 2

[0063] In the flow chart of the second experiment shown in Fig. 10, the conditions in the first part 5 of the furnace 1 were identical to those in the first embodiment. However, the supply of combustion air at the outlet of the second section 6 is reduced to 38,669Nm 3 / h, so that the sulfur dioxide concentration obtained at the outlet of section 6 is 18%. This ensures that all sulfur vapor entering the second section 6 through the first section 5 is consumed either at the outlet of the second section 6 or at the inlet of the waste heat boiler 15 . The temperature of the gas stream when entering the waste heat boiler 15 is about 1,600°C. The temperature drops rapidly in the waste heat boiler 15 and falls below 1,000° C. in less than 0.5 s. Therefore, the retention time at high temperature is so short that no large amounts of nitrogen oxides are formed.

[0064]Since sulfur dioxide with a concentration of 18% by volume is not suitable for entering conventional sulfuric acid ...

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Abstract

During the combustion of sulfur with air for producing sulfur dioxide, sulfur is burnt in a first portion of the combustion furnace under substoichiometric conditions. The sulfur dioxide formed in the first portion and unburnt sulfur are supplied to a second portion of the furnace adjoining the first portion, in that they are subjected to post-combustion with air. This provides for the production of sulfur-dioxide- containing gas free from nitrogen oxide.

Description

technical field [0001] The present invention relates to a process for the production of sulfur dioxide by combustion of sulfur with an oxygen-containing gas, in particular air, wherein sulfur and combustion air are supplied to a furnace and wherein the sulfur is volatilized in a first part of the furnace under substoichiometric conditions and subsequently Sulfur oxidation, and apparatus for carrying out the process. Background technique [0002] Sulfur dioxide is mainly used to produce sulfuric acid or liquid sulfur trioxide and is usually produced by calcination / smelting of sulfur-containing ores or by combustion of elemental sulfur. Combustion is usually carried out with atmospheric air, but oxygen-enriched air or even pure oxygen can also be used. In terms of cost, however, it is generally not desirable to burn sulfur with pure oxygen. Sulfur itself is currently used almost exclusively in liquid form and is usually supplied and temporarily stored in liquid form. Liquid...

Claims

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Application Information

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IPC IPC(8): C01B17/54
CPCC01B17/54Y02P20/129
Inventor K-H·道姆W-C·劳瑟W·斯查尔克
Owner METSO OUTOTEC (FINLAND) OY
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