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Sintering machine flue gas desulfurization process and device thereof

A desulfurization device, sintering machine technology, applied in the direction of calcium/strontium/barium sulfate, the use of liquid separation agent, the separation of dispersed particles, etc., can solve the problems of dust clogging equipment, inability to achieve desulfurization separation, increasing flue gas resistance, etc. The effect of prolonging service life, saving water consumption and improving desulfurization efficiency

Inactive Publication Date: 2012-07-04
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent does not control the water volume and pH of the flue gas. If the pH of the spray water is high, it will directly absorb the sulfur dioxide in the flue gas, and the separation of desulfurization and flue gas pretreatment cannot be realized; there is no stirring equipment in the slurry tank at the bottom of the device. The dust washed from the flue gas will block the equipment; in addition, this utility model introduces the inlet flue gas into the pretreatment device, and the equipment itself and the disturbance nozzle greatly increase the resistance of the flue gas

Method used

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  • Sintering machine flue gas desulfurization process and device thereof
  • Sintering machine flue gas desulfurization process and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A steel group 2×180m 2 The flue gas of the sintering machine adopts the wet limestone-gypsum desulfurization process. The pH value of the washing liquid in the flue gas washing tank is controlled at 2.5-2.8, and the residence time of the flue gas in the spray washing section is 2 seconds. The liquid-gas ratio is 3L / m 3 , the pH value of the absorption tower slurry is controlled at 5.2-5.5, and the amount of defoamer in the flue gas washing tank is 5g / m 3 d, entrance SO 2 Concentration is 3700mg / m3, export SO 2 The concentration is 81mg / m 3 , the liquid-gas ratio of the absorption tower is 8L / m 3 . The purity of the gypsum is greater than 97%, the residual calcium carbonate in the gypsum is less than 0.01%, and the Fe content is less than 0.02%.

Embodiment 2

[0039] A steel group 2×120m 2 The flue gas of the sintering machine adopts the wet limestone-gypsum desulfurization process, the pH value of the washing liquid in the flue gas washing tank is controlled at 2.5-3.0, and the residence time of the flue gas in the spray washing section is 1.8 seconds. The liquid-gas ratio is 5L / m 3 , the pH value of the absorption tower slurry is controlled at 5.2-5.6, and the amount of defoamer in the flue gas washing tank is 8g / m 3 d, entrance SO 2 The concentration is 4600mg / m 3 , export SO 2 The concentration is 113mg / m 3 , the liquid-gas ratio of the absorption tower is 10L / m 3 . The purity of the gypsum is as high as 96%, the residual calcium carbonate in the gypsum is less than 0.02%, and the Fe content is less than 0.03%.

Embodiment 3

[0041] A steel group 2×320m 2 The flue gas of the sintering machine adopts the wet limestone-gypsum desulfurization process, the pH value of the washing liquid in the washing tank is controlled at 2.5-2.7, the residence time of the flue gas in the spray washing section is 1.7 seconds, and the liquid-gas ratio of the flue gas washing is 5L / m 3 , the pH value of the absorption tower slurry is controlled at 5.2-5.5, and the amount of defoamer A in the washing tank is 10g / m 3 d, entrance SO 2 The concentration is 3900mg / m 3 , export SO 2 The concentration is 96mg / m 3 , the liquid-gas ratio of the absorption tower is 7L / m 3 . The purity of the gypsum is greater than 96%, the residual calcium carbonate in the gypsum is less than 0.01%, and the Fe content is less than 0.02%.

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Abstract

The invention discloses a sintering machine flue gas desulfurization process and a device thereof, and belongs to the technical field of air pollution control. The device comprises a slurry tank, an absorption tower, an inlet flue channel and an outlet flue channel. A flue gas washing tank is arranged below the inlet flue channel, wherein the flue gas washing tank is communicated with the inlet flue channel. A spraying device is arranged inside the inlet flue channel above the flue gas washing tank, and is communicated with the bottom of the flue gas washing tank through a circulating pump. The process comprises that: before the sintering machine flue gas enters the absorption tower, more than 95% of dust and all acid gases in the sintering machine flue gas are removed through a washing liquid when the sintering machine flue gas flows through the inlet flue channel above the flue gas washing tank, and then the treated sintering machine flue gas enters an absorption tower to carry out desulfurization. The device and the process of the present invention are used for pretreatment of the sintering machine flue gas before the desulfurization to remove the dust and the acid gas in the flue gas so as to improve the desulfurization efficiency and the oxidation rate of the flue gas in the absorption tower, reduce the investment cost and the operation cost of the sintering machine flue gas desulfurization, improve the purity of the desulphurization byproduct gypsum, and achieve the economic benefits of the flue gas desulfurization.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a sintering machine flue gas desulfurization process and device. Background technique [0002] By the end of 2008, there were 8,012 iron and steel enterprises in China, distributed in 31 provinces, municipalities or autonomous regions across the country; the total output value of the iron and steel industry in 2008 was 4,472.796 billion yuan, an increase of 32.71% over 2007, accounting for 9.1% of the total annual industrial output value of the country . Iron and steel production mainly includes sintering, pelletizing, coking, ironmaking, steelmaking, steel rolling, forging, ferroalloy, refractory materials, power and other links. Iron and steel plants have various furnaces and kilns that emit a lot of smoke and waste gas. If they are not controlled, they are industrial One of the major polluters in the sector. [0003] Sulfur dioxide in the iron and steel industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50B01D47/00C01F11/46
Inventor 李泽清莫建松程常杰
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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