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A method and device for producing sulfuric acid from flue gas desulfurization and sulfuric acid purification

A flue gas, sulfuric acid technology, applied in separation methods, combined devices, chemical instruments and methods, etc., can solve the problems of difficult separation, high operating costs, large ozone consumption and power consumption, and achieve high oxidation efficiency and oxidation. Long lasting effect to avoid clogging

Active Publication Date: 2019-03-19
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 producing sulfuric acid from flue gas desulfurization and sulfuric acid purification
  • A method and device for producing sulfuric acid from flue gas desulfurization and sulfuric acid purification
  • A method and device for producing sulfuric acid from flue gas desulfurization and sulfuric acid purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The flue gas composition of a catalytic cracking catalyst regenerated is shown in Table 1.

[0043] Table 1 Composition of flue gas regenerated from a catalytic cracking catalyst.

[0044]

[0045] Operating conditions of the present invention: (1) The dedusting and quenching tower adopts a turbulent liquid-gas ratio of 7.0L / m 3 ; (2) The deep dust removal unit 4-1 of the desulfurization tower is filled with packing, and the desulfurization unit adopts spray absorption, and the operating liquid-gas ratio of the deep dust removal unit is 3.0L / m 3 , the desulfurization unit first, second and third cycle desulfurization liquid gas ratio is 4.0L / m 3 ; (3) The absorption solution is ferric chloride solution, in which Fe 3+ The mass concentration is 3.0%; (4) The pH of the absorption liquid in the liquid holding tank of the dedusting and quenching tower is 1.0~2.0; (5) There are two absorption liquid regeneration towers, switching operation, and the commercially availabl...

Embodiment 2

[0048] The flue gas composition of adsorbent regeneration in a S zorb unit is shown in Table 2.

[0049] Table 2 Composition of flue gas from adsorbent regeneration in a certain S-zorb device.

[0050]

[0051] The operating conditions of the present invention: (1) The dedusting and quenching tower adopts a Venturi composition gas-liquid mass transfer unit, and the liquid-gas ratio is 3.0L / m 3 ; (2) The deep dust removal unit 4-1 of the desulfurization tower is filled with packing, and the desulfurization unit adopts spray absorption, and the operating liquid-gas ratio of the deep dust removal unit is 3.0L / m 3 , the desulfurization unit's primary, secondary and tertiary cycle desulfurization liquid-gas ratios are all 2.0L / m 3 ; (3) The absorption solution is ferric chloride and H 2 o 2 The mixed solution, where Fe 3+ Mass concentration 3.0%, H 2 o 2 The mass concentration is 1.0%; (4) The pH of the absorption liquid in the liquid holding tank of the dedusting quenchin...

Embodiment 3

[0054] The flue gas composition of a coal-fired boiler is shown in Table 3.

[0055] Table 3 Flue gas composition of a coal-fired boiler.

[0056]

[0057] Operating conditions of the present invention: (1) The dedusting and quenching tower adopts turbulence, and the liquid-gas ratio is 8.0L / m 3 ; (2) The deep dust removal unit 4-1 of the desulfurization tower is filled with packing, and the desulfurization unit adopts spray absorption, and the operating liquid-gas ratio of the deep dust removal unit is 3.0L / m 3 , the desulfurization unit's primary, secondary and tertiary cycle desulfurization liquid-gas ratios are all 4.0L / m 3; (3) The absorption solution is ferric chloride and H 2 o 2 The mixed solution, where Fe 3+ Mass concentration 3.0%, H 2 o 2 The mass concentration is 0.3%; (4) The pH of the absorption liquid in the liquid holding tank of the dedusting and quenching tower is 1.0-2.0; (5) There are two regeneration towers for the absorption liquid, switching op...

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Abstract

The invention discloses a method and device for producing sulfuric acid from flue gas desulfurization and sulfuric acid purification. The method includes the following contents: (1) after heat exchange, the flue gas enters a dedusting quenching tower for preliminary dedusting and cooling process; (2) enters The desulfurization tower passes through the deep dedusting unit, desulfurization unit, and water washing unit from bottom to top; (3) The overflow of the obtained rich absorption liquid passes through the desulfurization unit, deep dedusting unit in turn, and then enters the dedusting quenching tower for solid-liquid separation, and the remaining gas phase is discharged (4) The rich absorption liquid separated from the solid waste enters the absorption liquid regeneration tower, and passes through the H in the resin + After removing the transition metal cations in the rich absorption liquid, it enters the sulfuric acid storage tank in the form of dilute sulfuric acid. The method and device of the present invention can directly remove the SO in the flue gas 2 It is oxidized and converted into sulfuric acid, and concentrated to produce a higher concentration of sulfuric acid solution. The purified flue gas can meet the requirements of relevant national or local standards, and is suitable for the recovery and treatment of flue gas containing various concentrations of sulfur dioxide.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, in particular to a method and device for producing sulfuric acid from flue gas desulfurization and sulfuric acid purification, and belongs to the technical field of environmental protection. Background technique [0002] Since 2003, my country's SO 2 The total emissions have remained high. In 2014, my country's SO 2 The total emissions were 19.744 million tons, which was below 20 million tons for the first time since 2003. Although the goal of reducing sulfur dioxide by 10% during the "Eleventh Five-Year Plan" period in my country has been achieved, the current acid rain pollution area in China (accounting for 30% of the country's land area) is still expanding, and is changing from "sulfuric acid type" to "sulfuric acid nitric acid compound type" " Transformation. Each year due to acid rain and SO 2 Pollution has caused economic losses of more than 100 billion yuan in crops, f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14B01D47/00B01D50/00
CPCB01D47/00B01D53/14B01D2258/0283B01D2257/302B01D2252/00B01D50/60
Inventor 李欣王明星阮宗林王岩姜阳
Owner SINOPEC DALIAN RES INST OF PETROLEUM & PETROCHEMICALS CO LTD
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