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A method and device for flue gas desulfurization and sulfuric acid production

A flue gas and sulfuric acid technology, which is applied in the field of flue gas desulfurization and sulfuric acid production, can solve the problems of difficult separation, high operating costs, large ozone consumption and power consumption, and achieves high desulfurization efficiency, high utilization rate, and increased gas production. The effect of liquid mass transfer effect

Active Publication Date: 2019-01-25
SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology consumes a lot of ozone and electricity, and the operating cost is high, and both sulfuric acid and nitric acid are strong acids, which are difficult to separate.

Method used

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  • A method and device for flue gas desulfurization and sulfuric acid production
  • A method and device for flue gas desulfurization and sulfuric acid production
  • A method and device for flue gas desulfurization and sulfuric acid production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The composition of the regenerated flue gas of a catalytic cracking catalyst is shown in Table 1.

[0045] Table 1 Composition of the regenerated flue gas of a catalytic cracking catalyst.

[0046]

[0047] The operating conditions of the present invention: (1) The dedusting and quenching tower adopts a Venturi dust collector, and the liquid-gas ratio is 3.0L / m 3 ; (2) The deep dust removal unit 5-1 of the desulfurization tower is filled with packing, and the desulfurization unit is 2-level, all adopt spray absorption, and the liquid-gas ratio is 3.0L / m 3 ; (3) The absorbent of the desulfurization tower washing unit is supplemented with fresh water, and the liquid-gas ratio is 5.0L / m 3 (4) Microporous aeration hoses are arranged in the oxidation tank, so that the air is dispersed in the liquid phase in the form of micropores. Add ferric sulfate solution, in which Fe 3+ The mass concentration is 3.0%; (5) There are two regeneration towers, switching operation, and ...

Embodiment 2

[0050] The composition of the sorbent regeneration flue gas of a certain S zorb device is shown in Table 2.

[0051] Table 2 The composition of the sorbent regeneration flue gas of a certain S-zorb device.

[0052]

[0053] The operating conditions of the present invention: (1) The dust removal quench tower adopts turbulence as the mass transfer component, and the liquid-gas ratio is 7.0L / m 3 ; (2) The deep dedusting unit 5-1 of the desulfurization tower is filled with packing, and the desulfurization unit is 4 levels, all adopting spray absorption, and the liquid-gas ratio is 5.0 L / m 3 ; (3) The absorbent of the desulfurization tower washing unit is supplemented with fresh water, and the liquid-gas ratio is 3.0 L / m 3 ; (4) Microporous aeration hoses are arranged in the oxidation tank, so that the air is dispersed in the liquid phase in the form of micropores, and the amount of air added is 5 times the liquid (volume) amount in the oxidation tank. Add ferric sulfate solut...

Embodiment 3

[0056] The flue gas composition of a coal-fired boiler is shown in Table 3.

[0057] Table 3 The composition of flue gas of a coal-fired boiler.

[0058]

[0059] The operating conditions of the present invention: (1) The dust removal and quenching tower adopts turbulence, and the liquid-gas ratio is 8.0 L / m 3 ; (2) The deep dust removal unit 5-1 of the desulfurization tower is filled with packing, and the desulfurization unit is 3-level, all adopting spray absorption, and the liquid-gas ratio is 3.0 L / m 3 ; (3) The absorbent of the desulfurization tower washing unit is supplemented with fresh water, and the liquid-gas ratio is 5.0 L / m 3 ; (4) Microporous aeration hoses are arranged in the oxidation tank, so that the air is dispersed in the liquid phase in the form of micropores, and the amount of air added is 6 times the liquid (volume) amount in the oxidation tank. Add ferric sulfate solution, and auxiliary oxidant H 2 O 2 , where Fe 3+ Mass concentration 3.0%, H 2 ...

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Abstract

The present invention discloses a method and an apparatus for flue gas desulfurization and sulfuric acid production. The method comprises that (1) flue gas is subjected to heat exchange through a sulfuric acid storage tank, and then the obtained flue gas enters a dust removing quenching tower and is subjected to primary dust removing cooling; (2) the cooled flue gas enters a desulfurization tower and sequentially passes through a deep dust removing unit, a desulfurization unit and a water washing unit from bottom to top; (3) in the water washing unit, the SOx in the flue gas is absorbed with fresh water, the liquid phase overflows and sequentially passes through the desulfurization unit and the deep dust removing unit, the obtained liquid phase enters the dust removing quenching tower to obtain a rich absorption liquid, solid-liquid separation is performed, and the gas phase is discharged in atmosphere after defogging; and (4) the rich absorption liquid being subjected to solid waste separation is discharged into an oxidation tank, the liquid phase enters a regeneration tower, the Fe<3+> / Fe<2+> in the liquid phase is removed, and the obtained liquid phase enters the sulfuric acid storage tank in the form of dilute sulfuric acid. With the method and the apparatus of the present invention, the SO2 in the flue gas can be absorbed and concentrated, and can be oxidized into the sulfuric acid so as to produce the high concentration sulfuric acid, the purified flue gas can meet the national or local relevant standard requirements, and the method and the apparatus are suitable for the recovery treatment of flue gas containing various concentrations of sulfur dioxide.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and particularly relates to a method and a device for desulfurizing flue gas and producing sulfuric acid. Background technique [0002] Since 2003, my country's SO 2 Total emissions have remained high. In 2014, my country's SO 2 The total amount of emissions was 19.744 million tons, the first time since 2003 that it was below 20 million tons. Although my country's goal of reducing sulfur dioxide by 10% during the "Eleventh Five-Year Plan" period has been achieved, the current area of ​​acid rain pollution in my country (accounting for 30% of the country's land area) is still expanding, and it is changing from "sulfuric acid type" to "sulfuric acid nitric acid compound type" "Conversion. Every year due to acid rain and SO 2 Pollution has caused economic losses of more than 100 billion yuan in crops, forests and human health, and the control of sulfur dioxide emissions cannot be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14B01D53/18B01D47/06B01D47/00B01D47/14B01D50/00C01B17/76C01B17/80
CPCB01D47/00B01D47/06B01D47/14B01D50/00B01D53/1406B01D53/1418B01D53/1481B01D53/18B01D2247/107B01D2252/103B01D2257/302B01D2258/02C01B17/76C01B17/80
Inventor 王明星李欣阮宗林王岩姜阳
Owner SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD
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