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Technique of catalytic oxidation flue gas desulfurization and hydrocarbonylation by-product polymerization iron sulfate

A technology of polymerizing ferric sulfate and catalytic oxidation, which is applied in the field of flue gas purification, can solve the problems of low added value, high cost of desulfurization, incomplete oxidation of ferrous ions, etc., and achieve the effect of reducing raw material costs and improving economic benefits

Inactive Publication Date: 2008-03-05
DALIAN UNIV OF TECH
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  • Description
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AI Technical Summary

Problems solved by technology

The dilute sulfuric acid method solves the problem of clogging and scaling in the lime desulfurization process, but the by-product is still gypsum with low added value
[0006] Chinese patent (patent No. 00101556.7) discloses the process of utilizing iron filings as a desulfurizer. In the desulfurization process, ferrous sulfate crystals are first obtained, and then the ferrous sulfate crystals are oxidized into solid polyferric sulfate in a high-temperature oxidation tower. Using this The oxidation process does not require the addition of other oxidants, but there may be a problem of incomplete oxidation of ferrous ions
The oxidation of sulfite and ferrous ions produced by the desulfurization of this invention requires an oxidant to complete, so the cost of desulfurization is relatively high

Method used

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  • Technique of catalytic oxidation flue gas desulfurization and hydrocarbonylation by-product polymerization iron sulfate
  • Technique of catalytic oxidation flue gas desulfurization and hydrocarbonylation by-product polymerization iron sulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A 75t / h coal-fired thermoelectric boiler with a flue gas flow rate of 100,000 Nm 3 / h,SO 2 The content is 1500mg / Nm 3 , the flue gas temperature is 130°C, according to the process of the present invention, when leaving the desulfurization tower, the SO in the desulfurization tail gas 2 Content 150mg / Nm 3 , the flue gas temperature is 50°C, and the desulfurization efficiency is 90%.

[0038] The desulfurization tower is a packed tower with a diameter of 6m and a height of 28m. The packing is a stepped ring made of reinforced polypropylene with a nominal diameter of 50mm

[0039] The gas residence time of the desulfurization tower is 11s

[0040] The oxidation tower is a bubble tower, and the liquid residence time is 20min

[0041] The liquid-gas ratio of the desulfurization tower is 6L / Nm 3 , absorption liquid flow 600m 3 / h

[0042] The reaction pressure controlled by the desulfurization tower, oxidation tower and circulating reaction pool is normal pressure, an...

Embodiment 2

[0053] A 220t / h coal-fired thermoelectric boiler with a flue gas flow rate of 250,000 Nm 3 / h,SO 2 The content is 1500mg / Nm 3 , the flue gas temperature is 130°C, according to the process of the present invention, when leaving the desulfurization tower, the SO in the desulfurization tail gas 2 Content 150mg / Nm 3 , the flue gas temperature is 50°C, and the desulfurization efficiency is 90%.

[0054] The desulfurization tower is a packed tower with a diameter of 8.5m and a height of 32m. The packing is a stepped ring made of reinforced polypropylene with a nominal diameter of 50mm

[0055] The gas residence time of the desulfurization tower is 11s

[0056] The oxidation tower is a bubble tower, and the liquid residence time is 20min

[0057] The liquid-gas ratio of the desulfurization tower is 6L / Nm 3 , absorption liquid flow rate 1500m 3 / h

[0058] The reaction pressure controlled by the desulfurization tower, oxidation tower and circulating reaction pool is normal pre...

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Abstract

The catalytically oxidizing process for desulfurizing fume and co-producing polyferric sulfate includes: absorbing and dissolving SO2 from fume in a desulfurizing tower with ferrous sulfate solution as desulfurizing absorbent, catalytically oxidizing sulfite radical into sulfuric acid in the presence of O2 and iron ion as catalyst, reacting sulfuric acid and ferrous sulfate to co-produce liquid polyferric sulfate, and drying to obtain solid polyferric sulfate. The process has cheap desulfurizer, no waste discharge and obvious economic benefit, and is suitable for desulfurizing fume in boilers and other advantages.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and relates to a process for catalytic oxidation flue gas desulfurization and oxidation by-product polymerized ferric sulfate. Background technique [0002] my country is a sulfur-poor country, and the existing sulfuric acid resources cannot meet the needs of the rapid growth of the national economy, and more than 6 million tons of sulfuric acid need to be imported every year to produce sulfuric acid. In the treatment of flue gas SO 2 It is of great significance to fully recycle and utilize sulfur resources while polluting, and to develop sulfur resource technology. [0003] The "Pollution Prevention and Control Technology Policy of Coal-fired Sulfur Dioxide Emissions" released in January 2002 encourages the research and development of technologies that are suitable for local resource conditions and can recover sulfur resources; encourages the research and development of desulfuriz...

Claims

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Application Information

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IPC IPC(8): B01D53/50C01G49/16
Inventor 张玉周集体李承宇王国栋郭士元
Owner DALIAN UNIV OF TECH
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