Ferri-catalyzing desulfurization device for sintering flue gas and kiln flue gas and method

A technology of sintering flue gas and catalytic desulfurization, which is applied in chemical instruments and methods, separation methods, ferric sulfate, etc., can solve problems such as equipment corrosion, secondary pollution, and accumulation of desulfurized gypsum, and achieves reduced floor space, resource conservation, and The effect of avoiding secondary pollution

Pending Publication Date: 2019-01-29
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent 200910153849.1 discloses a limestone-gypsum wet-process simultaneous removal device and method for multiple pollutants used in coal-fired boilers. This patented technology realizes the simultaneous removal of SO in flue gas by using the limestone-gypsum method 2 , NO X and other pollutants, but this method will cause a series of problems such as serious secondary pollution, equipment corrosion and accumulation of desulfurized gypsum

Method used

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  • Ferri-catalyzing desulfurization device for sintering flue gas and kiln flue gas and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: When the flue gas volume is 150,000 to 200,000 Nm 3 , the flue gas with a temperature of 130-150°C passes through the first flue gas inlet pipe 7 and enters the first-stage absorption desulfurization tower 1 after being dedusted by the dust collector. The temperature of the flue gas is reduced to 110-120°C. 3+ The ion filtrate is sprayed into the primary absorption desulfurization tower 1, the filtrate is in contact with the flue gas for 3-4 seconds, and the SO 2 Efficiently oxidized to SO 3 , directly contact with the solution to generate dilute sulfuric acid, and the flue gas reacted in the primary absorption desulfurization tower 1 continues to enter the secondary absorption desulfurization tower 2 through the first flue gas outlet pipe 9, and the temperature of the flue gas will drop to 90-110°C. The same is the use of high-pressure spray gun will contain Fe 3+ The filtrate of ions is sprayed into the secondary absorption desulfurization tower 2, and th...

Embodiment 2

[0032] Example 2: When the flue gas volume is 400,000 to 450,000 Nm 3 , the flue gas with a temperature of 130-150°C is dedusted by the dust collector and then enters the first-stage absorption desulfurization tower 1 through the flue gas inlet pipe 7. After the flue gas temperature drops to 115-123°C, the Fe-containing 3+ The filtrate of ions is sprayed into the primary absorption desulfurization tower 1, and the filtrate is contacted with the flue gas for 3-5 seconds, and the SO 2 Efficiently oxidized to SO 3 , directly contact with the aqueous solution to generate dilute sulfuric acid, and the flue gas reacted in the primary absorption desulfurization tower 1 continues to enter the secondary absorption desulfurization tower 2 through the first flue gas outlet pipe 9, and the temperature of the flue gas will drop to 92-115°C. The same is the use of high-pressure spray gun will contain Fe 3+ The filtrate of ions is sprayed into the secondary absorption desulfurization tower...

Embodiment 3

[0033] Example 3: When the flue gas volume is 1 to 1.1 million Nm 3 , the flue gas with a temperature of 130-150°C passes through the first flue gas inlet pipe 7 and enters the first-stage absorption desulfurization tower 1 after being dedusted by the dust collector. After the flue gas temperature drops to 105-125°C, the Fe-containing 3+ The filtrate of ions is sprayed into the primary absorption desulfurization tower 1, and the filtrate is contacted with the flue gas for 4-5 seconds, and the SO 2 Efficiently oxidized to SO 3 , directly contact with the solution to generate dilute sulfuric acid, and the flue gas reacted in the primary absorption desulfurization tower 1 continues to enter the secondary absorption desulfurization tower 2 through the first flue gas outlet pipe 9, and the temperature of the flue gas will drop to 90-110°C. The same is the use of high-pressure spray gun will contain Fe 3+ The filtrate of the ion is sprayed into the secondary absorption desulfuriza...

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Abstract

The invention discloses a ferri-catalyzing desulfurization device for sintering flue gas and kiln flue gas and a method and belongs to the technical field of treatment of iron and steel sintering fluegas and the kiln flue gas. The desulfurization device comprises a dust collector, a first-stage absorption desulfurizer, a second-stage absorption desulfurizer, a third-stage absorption desulfurizer,a diluted acid tank, a packed tower, a freezing tank, a press filter, a filter liquor tank and a chimney. According to the device and the method, desulfurization solutions of different Fe<3+> contents can be prepared according to different flue gas rates and ingredient differences, so as to achieve the aim and effect of most effective desulfurization; SO2 can be easily oxidated into SO3 by oxygengas in the flue gases by using a catalytic action of Fe<3+>, the aim of removing the SO2 is achieved, and corresponding downstream products with different high added values such as FeSO4.7H2O, Fe3O4,Fe(OH)3 and ferric polysulfate can be prepared by using produced dilute sulfuric acid; and no obvious waste liquor and waste solid is produced during preparation. According to the device and the method, an environment-friendly circulating catalyzing process is achieved, and the problems such as secondary pollution, carbon emission and equipment corrosion resulting from calcium-method desulfurization and desulfurized gypsum accumulation caused by the calcium-method desulfurization are effectively avoided.

Description

Technical field: [0001] The invention belongs to the technical field of iron and steel sintering flue gas and kiln flue gas treatment, and in particular relates to an iron catalytic desulfurization device and method for sintering flue gas and kiln flue gas. Background technique: [0002] At present, as the impact of smog on the atmospheric environment is becoming more and more serious, people are paying more and more attention to the causes of smog. After research, researchers found that SO 2 and NO X (mainly NO) quickly forms sulfate and nitrate in the wet desulfurization device and dissolves in the water mist. With the discharge of the water mist, it reunites with fine dust in the atmosphere to form charged high-standard PM 2.5 particles; that is, when airborne dust, SO 2 and NO X When the aerosol system composed of such particles meets the climate conditions with sufficient humidity and water vapor, smog will form. The emission of sintering flue gas and kiln flue gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/50C01B17/74C01G49/14
CPCB01D53/8609B01D2258/0283C01B17/74C01G49/14
Inventor 李玉娇张千峰许超潘梦雅
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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