Method for desulfurization and denitrification of fume and coproduction of ammonium sulfate

A technology of ammonium sulfate and flue gas, which is applied in the field of flue gas purification, can solve the problems of oxidation failure of ferrous complexing agent and achieve significant economic benefits

Active Publication Date: 2015-07-08
青岛赛诺威尔工业水处理有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for simultaneously removing sulfur dioxide and nitrogen monoxide in flue gas by using aminocarboxylic acid ligands and pyrite, and by-product ammonium sulfate, effectively solving the oxidation failure of ferrous complexing agent question

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  • Method for desulfurization and denitrification of fume and coproduction of ammonium sulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A coal-fired boiler with a rated evaporation capacity of 75t / h and a flue gas volume of 100,000 Nm 3 / h, SO 2 The content is 1500mg / Nm 3 , NO content is 600mg / Nm 3 , the flue gas temperature is 135°C, according to the method of the present invention, the SO 2 Content 90mg / Nm 3 , NO content 60mg / Nm 3 , The desulfurization rate is 94%, and the denitrification rate is 90%.

[0026] Prepare a complexing agent solution with a concentration of 18mmol / L with equimolar ferrous sulfate and disodium edetate, and add coal powder with a particle size of 100-400 μm to make the slurry solid content 15%.

[0027] The absorption tower is a spray tower with a diameter of 4m and a height of 25m.

[0028] Absorption tower operating liquid gas ratio is 10L / Nm 3 , slurry flow rate 1000m 3 / h, the bottom of the absorption tower is used as a circulation pool, the residence time of the slurry in the circulation pool is 10min, and the pH value of the slurry is 3-4.

[0029] SO removal ...

Embodiment 2

[0031] A coal-fired boiler with a rated evaporation capacity of 150t / h and a flue gas volume of 198,000 Nm 3 / h, SO 2 Content 1500mg / m 3 , NO content 500mg / Nm 3 , the flue gas temperature is 120°C, according to the method of the present invention, the SO 2 Content 90mg / Nm 3 , NO content 40mg / Nm 3 , The desulfurization rate is 94%, and the denitrification rate is 92%.

[0032] The absorption tower is a spray tower with a diameter of 5.5m and a height of 29m.

[0033] Prepare a complexing agent solution with a concentration of 18mmol / L by equimolar ferrous sulfate and disodium edetate, and add mineral pyrite powder with a particle size of 200-600 μm to make the slurry solid content 20%.

[0034] Absorber operating liquid-gas ratio is 12L / Nm 3 , slurry flow rate 2376m 3 / h, the bottom of the absorption tower is used as a circulation pool, the residence time of the slurry in the circulation pool is 10min, and the pH value of the slurry is 3-4.

[0035] SO removal from flu...

Embodiment 3

[0037] A coal-fired boiler with a rated evaporation capacity of 130t / h and a flue gas volume of 170,000 Nm 3 / h, SO 2 Content 1500mg / Nm 3 , NO content 400mg / Nm 3 , the flue gas temperature is 130°C, according to the method of the present invention, the SO 2 Content 90mg / Nm 3 , NO content 40mg / Nm 3 , The desulfurization rate is 94%, and the denitrification rate is 90%.

[0038] The slurry is prepared with disodium edetate and coal powder with a particle size of 300-600 μm, the concentration of disodium edetate is 15 mmol / L, and the solid content is 18%. During the washing process, sulfur dioxide and oxygen leach coal-based pyrite to generate ferrous iron, which reacts with disodium edetate to generate ferrous complexing agent.

[0039] The absorption tower is a swirl plate tower with a diameter of 5m and a height of 25m.

[0040] Absorption tower operating liquid gas ratio is 10L / Nm 3 , slurry flow rate 1700m 3 / h, the bottom of the absorption tower is used as a circul...

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Abstract

The invention discloses a method for desulfurization and denitrification of fume and coproduction of ammonium sulfate. The method comprises the steps that slurry is prepared by a solution containing hydroxy carboxylic acid ligands and pyrite powder, the slurry is used for washing the fume containing sulfur dioxide and nitric oxide, sulfur dioxide and oxygen in the fume react with pyrite, sulfur dioxide and pyritic sulfur are oxidized into sulfate radicals, ferrous generated by leaching the pyrite is combined with aminocarboxylic acid ligands to generate a ferrous complexing agent, the ferrous complexing agent complexes and absorbs nitric oxide in the fume, a complexation product nitrosyl complex continues to react by the action of the pyritic to generate ammonium radicals, and the ammonium radicals are combined with the sulfate radicals to generate ammonium sulfate. According to the method, with the adoption of the pyrite, oxidation degradation of the ferrous complexing agent is inhibited, and the nitrosyl complex continues to react to generate the ammonium radicals. In addition, ferrous ions and the like leached from the pyrite have a catalyst effect in oxidizing sulfur dioxide.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and relates to a method for simultaneously removing sulfur dioxide and nitric oxide in flue gas by using pyrite and aminocarboxylic acid ligands and producing ammonium sulfate by-product. Background technique [0002] At present, the widely used flue gas denitrification method is the selective catalytic reduction method, but this method has the disadvantages of easy deactivation of the catalyst, easy leakage of ammonia and high operating costs. Because the nitrogen oxides in flue gas are mainly NO, and NO is almost insoluble in water and lye, it is proposed to use ferrous complexing agent to absorb NO, so that NO can easily transfer from gas phase to liquid phase. However, because ferrous iron is easily oxidized to ferric iron, and the oxidized complexing agent cannot complex with NO, the absorption efficiency drops rapidly, so this method has not been widely used. In addition, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/60C01C1/24
Inventor 孙文寿高洁王力超陈佳仪
Owner 青岛赛诺威尔工业水处理有限公司
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