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Integrated device and method for denitrification and mercury removal in sintering flue gas circulating fluidized bed desulfurization

A circulating fluidized bed and sintering flue gas technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of low solubility, difficulty in controlling mercury, mercury pollution, etc., and achieve wide sources, easy absorption, The effect of low running cost

Active Publication Date: 2021-12-10
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The form of mercury in flue gas: elemental mercury (Hg 0 ), monovalent mercury (Hg + ) and divalent gaseous mercury (Hg 2+ ), the mercury present in particulate form in flue gas (Hg + ) can be partially removed by dust removal equipment such as bag filter or classic dust collector, divalent mercury (Hg 2+ ) is relatively stable, easily soluble in water, and can be removed by adsorption by fly ash in flue gas or by desulfurization equipment, while elemental mercury (Hg 0 ) has a low solubility in water and can exist relatively stably in the atmosphere, while mercury existing in the gas phase is more difficult to control, which in turn will form global mercury pollution

Method used

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  • Integrated device and method for denitrification and mercury removal in sintering flue gas circulating fluidized bed desulfurization
  • Integrated device and method for denitrification and mercury removal in sintering flue gas circulating fluidized bed desulfurization
  • Integrated device and method for denitrification and mercury removal in sintering flue gas circulating fluidized bed desulfurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1: The flue gas volume of sintering flue gas is 1 million Nm 3 / h, where SO 2 The content is 650~800mg / Nm 3 , NO X The content is 200~280mg / Nm 3 , the oxygen content is 13-16%, and the water content is 5-7%. When the flue gas enters the pipeline through the electrostatic precipitator, the prepared component A of the denitrification oxidant is sprayed into the flue with a high-pressure spray gun, and the formed mist water vapor fully contacts with the flue gas, and quickly oxidizes NO to NO 2 , SO 2 in Fe 3+ Catalyzed by ions into SO 3 , consume about 276-387Kg / h of denitrification oxidizer A component. At the same time, the lime is added into the pipeline where the industrial water tank is located through the digestion tank, and the B component of the denitration reduction absorbent in the denitration reduction absorbent tank is sprayed into the bottom of the CFB reactor through the denitration pump, and then enters the CFB reactor to participate in the r...

Embodiment 2

[0055] Example 2: The flue gas volume of sintering flue gas is about 1.3 million Nm 3 / h, where SO 2 The content is 680~850mg / Nm 3 , NO X The content is 210~250mg / Nm 3 , the oxygen content is about 14-16%, and the water content is about 8-10%. When the flue gas enters the pipeline through the electrostatic precipitator, the prepared component A of the denitrification oxidant is sprayed into the flue with a high-pressure spray gun, and fully contacts with the flue gas to quickly oxidize NO to NO 2 , SO 2 in Fe 3+ Catalyzed by ions into SO 3 , about 364.7-432.9Kg / h of denitrification oxidant component A is consumed. At the same time, the lime is added into the pipeline where the industrial water tank is located through the digestion tank, and the B component of the denitration reduction absorbent in the denitration reduction absorbent tank is sprayed into the bottom of the CFB reactor through the denitration pump, and then enters the CFB reactor to participate in the reac...

Embodiment 3

[0056] Example 3: The flue gas volume of sintering flue gas is about 1.6 million Nm 3 / h, where SO 2 The content is 800~1000mg / Nm 3 , NO X The content is 250~280mg / Nm 3 , the oxygen content is about 15-16%, and the water content is about 10-11%. When the flue gas enters the pipeline through the electrostatic precipitator, the prepared component A of the denitrification oxidant is sprayed into the flue with a high-pressure spray gun, and fully contacts with the flue gas to quickly oxidize NO to NO 2 , SO 2 in Fe 3+ Catalyzed by ions into SO 3, about 523.2-583.2Kg / h of component A of the denitrification oxidant is consumed. At the same time, the lime is added into the pipeline where the industrial water tank is located through the digestion tank, and the B component of the denitration and reduction absorbent in the denitration and reduction absorbent tank is sprayed into the bottom of the CFB reactor through the denitration pump, and then enters the CFB reactor to partici...

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Abstract

The invention discloses an integrated device and method for denitrification and demercury removal in desulfurization of a sintering flue gas circulating fluidized bed, and belongs to the technical field of desulfurization and denitrification of sintering flue gas. The device includes CFB reactor, industrial water tank, digestion tank, denitrification reduction absorbent tank, bag dust removal system, flue gas monitoring system and electrostatic dust removal system. In this method, component A of the denitrification oxidant is sprayed into the flue between the electrostatic precipitator and the CFB reactor. The component A of the denitrification oxidant will quickly oxidize part of the NO in the flue gas into high-valence polynitrogen oxides that are easily absorbed by water vapor. The mixture then enters the CFB reactor; the B component of the denitrification reducing absorbent is sprayed into the CFB reactor, the lime is sprayed into the CFB reactor, and the flue gas after desulfurization and denitrification is detected by the flue gas monitoring system after dedusting discharge. The invention has the advantages of simple method, green circulation, no pollution, low operation cost and remarkable economic and environmental benefits.

Description

Technical field: [0001] The invention belongs to the technical field of desulfurization and denitrification of sintering flue gas, and in particular relates to an integrated device and method for denitrification and demercuration in desulfurization of sintering flue gas circulating fluidized bed. Background technique: [0002] Sintering flue gas is the main source of air pollutants emitted by iron and steel enterprises, mainly including sulfur dioxide, nitrogen oxides, particulate matter, dioxins, heavy metals and other pollutants, among which sulfur dioxide, nitrogen oxides and trace toxic Pollution control and emission reduction of metal element mercury. With the introduction of the ecological civilization construction and green development policy of the Fifth Plenary Session of the Thirteenth Central Committee of the Communist Party of China, the iron and steel industry's original desulfurization-based single pollutant treatment has been transformed into a multi-pollutant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/86B01D53/78B01D53/56B01D53/50B01D46/02B01D46/44
CPCB01D53/75B01D53/8696B01D53/8628B01D53/56B01D53/502B01D53/504B01D53/78B01D46/023B01D46/44B01D2258/0283B01D2257/404B01D2251/2067B01D2251/21B01D2251/902B01D2251/404B01D2251/608
Inventor 潘梦雅张千峰李玉娇陆伟星
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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