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A method for removing low-concentration sulfur dioxide in flue gas and preparing sodium metabisulfite

A sodium pyrosulfite and sulfur dioxide technology, applied in the chemical industry, can solve the problems of large steam consumption, high operating cost, and long system process of desulfurization by-products, and achieve the effects of wide application range, low operating cost, and high desulfurization efficiency

Inactive Publication Date: 2021-12-14
株洲湘三特环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the system process is long, the investment is large, the recovery of desulfurization by-products consumes a lot of steam, and the operating cost is high.

Method used

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  • A method for removing low-concentration sulfur dioxide in flue gas and preparing sodium metabisulfite
  • A method for removing low-concentration sulfur dioxide in flue gas and preparing sodium metabisulfite
  • A method for removing low-concentration sulfur dioxide in flue gas and preparing sodium metabisulfite

Examples

Experimental program
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Effect test

Embodiment 1

[0051] This example is the first specific embodiment of the method for preparing sodium metabisulfite product from low-concentration sulfur dioxide in flue gas according to the present invention:

[0052] The method for preparing sodium metabisulfite product, its process is as follows:

[0053] (1), flue gas purification: the temperature is 280 ℃, SO 2 Content 0.1% (ie 2860mg / Nm 3 ) of zinc smelting rotary kiln flue gas 50000Nm 3 / h, sent to the water washing tower for washing to remove dust and SO in the flue gas 3 , the dust content of flue gas after water washing is 30mg / Nm 3 , the flue gas temperature drops to 60°C;

[0054] (2), SO 2 Absorption: SO after purification and cooling 2 Flue gas with 0.1% content 50000Nm 3 / h, enter the secondary series rotary tangential flow scrubber, in the secondary series rotary tangential flow scrubber, and the Na-containing 2 CO 3 30wt%-Na 2 SO 3 15wt%-NaHSO 3 10wt% of the absorbing liquid (pH value is 6.5) is in reverse conta...

Embodiment 2

[0058] This example is the second specific embodiment of the method for preparing sodium metabisulfite product from low-concentration sulfur dioxide in flue gas according to the present invention:

[0059] The method for preparing sodium metabisulfite product, its process is as follows:

[0060] (1), flue gas purification: the temperature is 250 ℃, SO 2 Content 1.0% (ie 28600mg / Nm 3 ) of zinc smelting rotary kiln flue gas 60000Nm 3 / h, sent to the water washing tower for washing to remove dust and SO in the flue gas 3 , the dust content of flue gas after water washing is 28mg / Nm 3 , the flue gas temperature drops to 65°C;

[0061] (2), SO2 absorption: SO after purification and cooling 2 Flue gas with 1.0% content 60000Nm 3 / h, enter the secondary series spray scrubber, in the secondary series series spray scrubber, and the Na containing 2 CO 3 35wt%-Na 2 SO 3 18wt%-NaHSO 3 7wt% of the absorption liquid (pH value is 6.8) is in reverse contact, an absorption reaction ...

Embodiment 3

[0065] The present embodiment is the third specific embodiment of the method for preparing sodium metabisulfite product from low-concentration sulfur dioxide in flue gas according to the present invention:

[0066] The method for preparing sodium metabisulfite product, its process is as follows:

[0067] (1), flue gas purification: the temperature is 250 ℃, SO 2 Content 2.0% (ie 57200mg / Nm 3 ) of zinc smelting rotary kiln flue gas 50000Nm 3 / h, sent to the water washing tower for washing to remove dust and SO in the flue gas 3 , the dust content of flue gas after water washing is 29mg / Nm 3 , the flue gas temperature drops to 70°C;

[0068] (2), SO2 absorption: SO after purification and cooling 2 Flue gas with 2.0% content 50000Nm 3 / h, enter the secondary scrubber connected in series with the rotary tangential flow scrubber and the spray scrubbing tower. 2 CO 3 40wt%-Na 2 SO 3 20wt%-NaHSO3 5wt% of the absorption liquid (pH value is 7.0) is in reverse contact, and the...

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Abstract

The invention proposes a method for removing low-concentration sulfur dioxide in flue gas and preparing sodium pyrosulfite, containing SO 2 After the flue gas is washed and purified, it is absorbed by the absorption liquid and reacts to generate Na 2 SO 3 ‑NaHSO 3 The mixed absorption liquid enters the neutralization tower and reacts with sodium carbonate solution to form saturated sodium sulfite liquid, absorbs and reacts with sulfur dioxide-containing waste flue gas from acid production to form supersaturated sodium bisulfite solution, and then contacts with sulfur dioxide to form sodium metabisulfite solid After centrifugation, the solid is air-dried to form anhydrous sodium metabisulfite product. The invention has short process flow, high desulfurization efficiency, less energy consumption, low operating cost, stable product quality, no secondary pollution, and is suitable for various industrial kilns and coal-fired boiler flue gas in metallurgy, steel, thermal power and other industries Removal and recycling of sulfur dioxide.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for removing low-concentration sulfur dioxide in flue gas and preparing sodium pyrosulfite. Background technique [0002] Sulfur dioxide (SO 2 ) is one of the main pollutants in the atmosphere, which has a great impact on human health, mainly damaging the respiratory organs and causing acute and chronic hazards. Many acute air pollution poisoning incidents in the world are related to sulfur dioxide pollution. At present, my country's sulfur dioxide emissions rank first in the world, mainly from thermal processes such as fossil fuel combustion, sulfur-containing ore roasting, smelting, and chemical production. Air pollution caused by a large amount of sulfur dioxide emissions not only seriously affects people's health , It also hinders the development of the economy. Therefore, in order to realize the sustainable development of the economy and the environment, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50C01D5/14
CPCB01D53/78B01D53/502C01D5/145Y02P20/10
Inventor 姚树明李剑胜陶政修易瑶筝周雪姣曾超
Owner 株洲湘三特环保有限公司