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Semi-dry desulfurization-denitrification integrated device and method for sintering flue gas

A semi-dry desulfurization and sintering flue gas technology, applied in the field of desulfurization and denitrification, can solve problems such as difficult to handle nitrate and nitrite, hazardous waste of nitrite, environmental impact, etc., and achieve simple operation and low operating cost , little corrosion effect

Active Publication Date: 2020-02-14
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the process runs longer, a large amount of nitrate and nitrite will be generated in the later stage, which is difficult to handle. Among them, nitrite is hazardous waste and will have a greater impact on the environment.

Method used

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  • Semi-dry desulfurization-denitrification integrated device and method for sintering flue gas
  • Semi-dry desulfurization-denitrification integrated device and method for sintering flue gas
  • Semi-dry desulfurization-denitrification integrated device and method for sintering flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: The flue gas volume of sintering flue gas is 1.1 million Nm 3 / h. The flue gas from the sintering machine is dedusted by the electrostatic precipitator to greatly reduce the amount of dust. At this time, the flue gas is drawn into the flue by the main exhaust fan. At the same time, the denitrification oxidant component A is sprayed into the flue on the right side of the main exhaust fan through a high-pressure spray gun, and part of the NO in the flue gas is quickly oxidized by the denitrification oxidant component A into high-valence nitrogen oxides, SO 2 Oxidation to SO 3 , The approximate consumption of denitrification oxidant component A is 425-430Kg / h. Subsequently, the oxidized flue gas enters the SDA desulfurization tower, and at the same time, the slaked lime slurry is transformed into very fine droplets (less than 50 μm on average) to spray the flue gas through a rotary atomizer. At this time, the denitration and reduction absorbent components B i...

Embodiment 2

[0052] Example 2: The flue gas volume of sintering flue gas is 900,000 Nm 3 / h. The flue gas from the sintering machine is dedusted by the electrostatic precipitator to greatly reduce the amount of dust. At this time, the flue gas is drawn into the flue by the main exhaust fan. At the same time, the denitrification oxidant component A is sprayed into the flue on the right side of the main exhaust fan through a high-pressure spray gun, and part of the NO in the flue gas is quickly oxidized by the denitrification oxidant component A into high-valence nitrogen oxides, SO 2 Oxidation to SO 3 , The approximate consumption of denitrification oxidant component A is 298-305Kg / h. Subsequently, the oxidized flue gas enters the SDA desulfurization tower, and at the same time, the slaked lime slurry is transformed into very fine droplets (less than 50 μm on average) to spray the flue gas through a rotary atomizer. At this time, the denitration and reduction absorbent components B is al...

Embodiment 3

[0053] Example 3: The flue gas volume of sintering flue gas is 1 million Nm 3 / h. The flue gas from the sintering machine is dedusted by the electrostatic precipitator to greatly reduce the amount of dust. At this time, the flue gas is drawn into the flue by the main exhaust fan. At the same time, the denitrification oxidant component A is sprayed into the flue on the right side of the main exhaust fan through a high-pressure spray gun, and part of the NO in the flue gas is quickly oxidized by the denitrification oxidant component A into high-valence nitrogen oxides, SO 2 Oxidation to SO 3 , the approximate consumption of denitrification oxidant component A is 346.5-355Kg / h. Subsequently, the oxidized flue gas enters the SDA desulfurization tower, and at the same time, the slaked lime slurry is transformed into very fine droplets (less than 50 μm on average) to spray the flue gas through a rotary atomizer. At this time, the denitration and reduction absorbent components B i...

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Abstract

The invention discloses a semi-dry desulfurization-denitrification integrated device and method for sintering flue gas, belonging to the technical field of desulfurization and denitrification. The device comprises a sintering machine, an electric precipitator, a main exhaust fan, an oxidizing agent tank, a rotary atomizer, an SDA desulfurizing tower, a reductant absorption tank, a supplementary absorbent tank, a bag-type dust collector, a booster fan and a flue gas monitoring device. The method comprises the following steps: firstly, dedusting flue gas by virtue of the electric precipitator, then feeding the flue gas into a flue, spraying a denitration oxidant component A into the flue, feeding the treated flue gas into the SDA desulfurization tower, spraying flue gas with slaked lime slurry, and spraying a denitration reduction absorbent component B into the SDA desulfurization tower by virtue of a high-pressure spray gun; and spraying the denitration supplementary absorbent componentC into a pipeline located between the exhaust outlet of the SDA desulfurization tower and the bag-type dust collector, and discharging the purified flue gas through a chimney after the flue gas is dedusted by the bag-type dust collector. The method disclosed by the invention is simple and low in operation cost, and has remarkable environment-friendly benefits.

Description

Technical field: [0001] The invention belongs to the technical field of desulfurization and denitrification, and in particular relates to an integrated device and method for semi-dry desulfurization and denitrification of sintering flue gas. On the basis of SDA desulfurization of sintering flue gas, the denitrification is transformed to achieve the integration of desulfurization and denitrification. Background technique: [0002] In my country's iron and steel enterprises, sintering is an essential process in the production process, which accounts for more than 70% of the supply of iron-containing raw materials for blast furnaces. However, this process is also the largest pollutant emission in iron and steel enterprises, among which SO 2 , NO X These emissions accounted for about 70% and 50% of the total emissions of iron and steel enterprises, respectively. With the increasingly stringent environmental protection policies, China revised the "Steel Sintering and Pelletizin...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/86B01D53/50B01D53/56B01D53/75B01D53/18B01D53/14B01D50/00
CPCB01D53/80B01D53/8628B01D53/8631B01D53/502B01D53/56B01D53/75B01D53/18B01D53/14B01D50/00B01D2258/0283B01D2257/404B01D2255/20738B01D2252/20
Inventor 潘梦雅张千峰李玉娇陆伟星
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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