Method and device for transforming high-concentration SO2 flue gas to prepare sulfuric acid

A SO2, high-concentration technology, applied in chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., can solve the problems of large conversion, catalyst deactivation, high reaction heat, etc., and achieve the effect of ensuring that it will not be destroyed

Inactive Publication Date: 2018-03-27
JIANGSU TIANRUN CHEM EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past two decades, an oxygen-enriched smelting technology that can improve fuel efficiency, save energy and reduce consumption has been more and more widely used in the non-ferrous metal smelting industry, accompanied by SO in smelting flue gas 2 Concentration increased substantially, SO 2 Concentrations around 20% become the norm, while high concentrations of SO 2 For flue gas conversion, due to the large amount of conversion in the first stage and the high heat of reaction, the temperature of the flue gas after the first stage of conversion is ≥ 620 ° C, which will cause the catalyst to lose its activity

Method used

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  • Method and device for transforming high-concentration SO2 flue gas to prepare sulfuric acid
  • Method and device for transforming high-concentration SO2 flue gas to prepare sulfuric acid
  • Method and device for transforming high-concentration SO2 flue gas to prepare sulfuric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 100 tons of SO 2 20% volume concentration of SO 2 Flue gas, sulfuric acid is produced through this method and this device

[0036] Here, the values ​​of V1, V2 and V3 are as follows:

[0037] V 1

V 2

V 3

50

50

50

[0038] Volume is V 1 SO 2 SO 2 When the concentration is 10%, the conversion rate in the pre-reformer is 65%, and the SO in the mixed flue gas after conversion 2 with SO 3 The concentration is as follows:

[0039] SO 2

SO 3

3.5％

6.5％

[0040] The pre-reformed flue gas has a volume of V 2 SO 2 After the flue gas is mixed in the first branch, SO 2 with SO 3 The concentrations are as follows:

[0041] SO 2

SO 3

9％

4.3％

[0042] After the mixed flue gas enters the converter, the conversion rate of each layer is as follows:

[0043] one turn

Embodiment 2

[0045] 100 tons of SO 2 16% SO by volume 2 Flue gas, sulfuric acid is produced through this method and this device

[0046] Here, the values ​​of V1, V2 and V3 are as follows:

[0047] V 1

V 2

V 3

50

50

30

[0048] Volume is V 1 SO 2 Flue gas with volume V 3 The dry air SO after mixing in the first outlet of the preheater 2 When the concentration is 10%, the conversion rate in the pre-reformer is 65%, and the SO in the mixed flue gas after conversion 2 with SO 3 The concentration is as follows:

[0049] SO 2

SO 3

3.5％

6.5％

[0050] The pre-reformed flue gas has a volume of V 2 SO 2 After the flue gas is mixed in the first branch, SO 2 with SO 3 The concentrations are as follows:

[0051]

[0052]

[0053] After the mixed flue gas enters the converter, the conversion rate of each layer is as follows:

[0054] one turn

Embodiment 3

[0056] 100 tons of SO 2 30% volume concentration of SO 2 Flue gas, sulfuric acid is produced through this method and this device

[0057] Here, the values ​​of V1, V2 and V3 are as follows:

[0058] V 1

V 2

V 3

50

50

100

[0059] Volume is V 1 SO 2 SO 2 When the concentration is 10%, the conversion rate in the pre-reformer is 65%, and the SO in the mixed flue gas after conversion 2 with SO 3 The concentration is as follows:

[0060] SO 2

SO 3

3.5％

6.5％

[0061] The pre-reformed flue gas has a volume of V 2 SO 2 After the flue gas is mixed in the first branch, SO 2 with SO 3 The concentrations are as follows:

[0062] SO 2

SO 3

10.1％

4.8％

[0063] After the mixed flue gas enters the converter, the conversion rate of each layer is as follows:

[0064] one turn

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Abstract

The invention provides a method and a device for transforming high-concentration SO2 flue gas to prepare sulfuric acid and belongs to the field of sulfuric acid preparation. The method and the deviceare suitable for transforming the high-concentration SO2 flue gas to prepare the sulfuric acid and the problems that reaction heat of one section of transforming the high-concentration SO2 flue gas toprepare the sulfuric acid is too high and a catalyst is inactivated due to high temprature are solved. According to the method and the device, dry air and part of high-concentration SO2 flue gas aremixed and diluted; the concentration of the diluted SO2 flue gas is controlled to be 10 percent+/-0.5 percent; the diluted SO2 flue gas is pre-transformed to obtain SO3 flue gas with a certain concentration; then the flue gas containing SO3 and the residual part of main flue gas are mixed and mixed gas enters a main transforming device and is transformed. By adopting the method and the device, provided by the invention, the concentration of SO2 is controlled to be 10 percent+/-0.5 percent through mixing with the dry air, and the SO3 flue gas with the certain concentration is transformed through pre-transformation. The transformation rate of each phase can be controlled very well and the stable and reliable sulfuric acid can be produced through utilizing the high-concentration SO2 flue gas;meanwhile, the catalyst in the transforming device is ensured not to be damaged.

Description

technical field [0001] The invention belongs to the field of sulfuric acid preparation, in particular, relates to a kind of high-concentration SO 2 A method and device for producing sulfuric acid by reforming flue gas. Background technique [0002] At present, there are abundant reserves of metal sulfide minerals in non-ferrous metal mineral resources, especially copper ore, nickel ore and lead ore. These metal sulfide minerals will produce a large amount of SO in the process of pyrometallurgy 2 The gas is generally recovered by the method of producing sulfuric acid from flue gas. In flue gas to sulfuric acid process, SO 2 converted to SO 3 The reaction is a strongly exothermic reversible reaction, which needs to be approached to the reaction equilibrium and achieve the maximum conversion rate under the action of a multi-layer catalyst at 400-420 °C. At the same flue gas flow rate, SO 2 The higher the concentration, the greater the heat released by the reaction, but li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74
CPCC01B17/74
Inventor 张志清霍广田陈有祥王志亮霍亚东何陆洋徐爱莲
Owner JIANGSU TIANRUN CHEM EQUIP
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