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A flue gas advanced treatment method for synchronous desulfurization and denitrification by absorption method

A desulfurization, denitrification and advanced treatment technology, applied in separation methods, chemical instruments and methods, and air quality improvement, etc., can solve problems such as difficulty in meeting industrial emission standards, high investment and operating costs, and no improvement in NO solubility. Accelerates the dissolution rate of NO, develops pores, and overcomes the effect of insoluble NO

Active Publication Date: 2021-09-21
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN107744715A uses the main product ammonium sulfite in the ammonia desulfurization process as NO, SO 2 Absorbent, use bubbling method and add absorption aid CuO in the absorption liquid to solve the problem of NO insoluble in water, but there are secondary pollution problems such as ammonia volatilization
Patent CN101574617B uses the pulp prepared from pyrolusite and metal chelating agent as absorbent to absorb SO in coal-fired flue gas 2 , NO x Synchronous absorption and removal, the metal chelating agent is used to remove calcium, magnesium, lead, zinc, iron and other multivalent metal ions in pyrolusite pulp, eliminating the problem that metal ion precipitation and scaling affect the desulfurization interface reaction. After solid-liquid separation, the mother liquor can be Utilize the poor solubility of manganese sulfate and manganese nitrate at the same temperature to realize the recycling of sulfur and manganese, but it does not improve the solubility of NO in the absorption liquid, and there is a problem of low NO removal rate
[0004] When previous studies used strong oxidants such as sodium chlorite and ozone, although NO and SO 2 The removal efficiency is high, but most of the oxidants are relatively expensive, and the investment and operation costs are high, so it is difficult to apply industrially; if the absorption liquid such as ammonium sulfite and pyrolusite slurry is used, the NO removal rate is low, generally 60- 70%, difficult to meet industrial emission standards

Method used

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  • A flue gas advanced treatment method for synchronous desulfurization and denitrification by absorption method
  • A flue gas advanced treatment method for synchronous desulfurization and denitrification by absorption method
  • A flue gas advanced treatment method for synchronous desulfurization and denitrification by absorption method

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Experimental program
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Effect test

Embodiment 1

[0037] Select manganese oxide ore from a place in Anhui, the chemical composition of the ore is: SiO 2 , 34.63%; MnO, 20.91%; Fe 2 o 3 , 5.58%; Al 2 o 3 , 4.23%; CaO, 2.21%; ZnO, 1.64%; K 2 O, 1.04%; MgO, 0.65%; P 2 o 5 , 0.56%; loss on ignition, 27.65%; others, 0.9%. The content of manganese oxide is 26.4%, and the microscopic characteristics of manganese oxide can be seen in figure 1 .

[0038] Grind the manganese oxide ore in a ball mill for 60 minutes, and sieve to obtain a 325-mesh powder. Then mix it according to the mass ratio of manganese oxide powder and water at 1:10 to make a suspension. Add polyethylene glycol accounting for 3% of the mass of the suspension to the suspension, and then adjust the pH of the suspension to 4 with sulfuric acid to obtain an absorption liquid for simultaneous desulfurization and denitrification.

[0039] Put the absorbent into the figure 2 In the simulated experimental device shown, the NO / Ar, SO 2 0.1% SO by volume 2 / Ar,O...

Embodiment 2

[0041] Select manganese oxide ore from a place in Anhui, the chemical composition of the ore is: SiO 2 , 34.63%; MnO, 20.91%; Fe 2 o 3 , 5.58%; Al 2 o 3 , 4.23%; CaO, 2.21%; ZnO, 1.64%; K 2 O, 1.04%; MgO, 0.65%; P 2 o 5 , 0.56%; loss on ignition, 27.65%; others, 0.9%. The content of manganese oxide is 26.4%, and the microscopic characteristics of manganese oxide can be seen in figure 1 .

[0042] Grind the manganese oxide ore in a ball mill for 30 minutes, and sieve to obtain a 325-mesh powder. Then mix it according to the mass ratio of manganese oxide ore powder and water at 1:20 to make a suspension. Add polyethylene glycol accounting for 0%, 0.2%, 0.6%, 1.0%, 1.4%, 1.8%, 2.2%, 2.6%, 3.0%, 3.4%, 3.8% of the suspension mass to the suspension, and then use sulfuric acid Adjust the pH of the suspension to 4, namely to obtain absorption solutions with different polyethylene glycol concentrations for simultaneous desulfurization and denitrification.

[0043] The absorp...

Embodiment 3

[0045] Select manganese oxide ore from a place in Anhui, the chemical composition of the ore is: SiO 2 , 34.63%; MnO, 20.91%; Fe 2 o 3 , 5.58%; Al 2 o 3 , 4.23%; CaO, 2.21%; ZnO, 1.64%; K 2 O, 1.04%; MgO, 0.65%; P 2 o 5 , 0.56%; loss on ignition, 27.65%; others, 0.9%. The content of manganese oxide is 26.4%, and the microscopic characteristics of manganese oxide can be seen in figure 1 .

[0046] Grind the manganese oxide ore in a ball mill for 30 minutes, and sieve to obtain a 325-mesh powder. Then mix according to the mass ratio of pyrolusite powder and water at 1:30 to make a suspension. Add 3.0% polyethylene glycol to the suspension, and then adjust the pH of the suspension to 3 with sulfuric acid to obtain an absorption liquid for simultaneous desulfurization and denitrification.

[0047] Put the absorbent into the figure 2 In the simulated experimental device shown, the NO / Ar, SO 2 0.1% SO by volume 2 / Ar,O 2 15% by volume O 2 / Ar gas distribution for abs...

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Abstract

The invention discloses a flue gas advanced treatment method for synchronous desulfurization and denitrification by absorption method, which uses natural manganese oxide ore or synthetic nano manganese oxide added with surfactant as NO x and SO 2 The absorption liquid realizes flue gas purification. The method for synchronous desulfurization and denitrification of the present invention, SO 2 The removal rate is maintained above 95%, the NO removal rate is maintained above 80%, the reaction product can be separated and utilized, the operation cost is low, and it has a good prospect.

Description

technical field [0001] The invention belongs to the field of air pollution control engineering, and in particular relates to a wet absorption method synchronous desulfurization and denitrification flue gas treatment method. Background technique [0002] Various types of boilers and kilns produce a large amount of SO in the process of high temperature combustion 2 , NOx, resulting in acid rain in 81.6% of cities across the country. Nitrogen oxide emissions can also lead to regional environmental pollution problems such as photochemical smog and ozone layer depletion. Current technologies for controlling NOx emissions include Selective Catalytic Oxidation (SCO), Non-Selective Catalytic Reduction (SNCR) and Selective Catalytic Reduction (SCR). Desulfurization processes are mainly wet and semi-dry, among which calcium desulfurization is the main one, accounting for about 85% of the market. At present, the flue gas purification process widely used in my country is the combined...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/60B01D53/80
CPCB01D53/60B01D53/80Y02A50/20
Inventor 陈天虎孙付伟刘海波张常爱陈冬
Owner HEFEI UNIV OF TECH
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