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Hydrazine solution special for chimney flue gas desulfurization and denitrification and preparation method thereof

A desulfurization and denitrification, solution technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as ammonia escape, achieve low ammonia escape rate, inhibit volatilization and decomposition, and reduce NH3

Active Publication Date: 2020-10-02
周凯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a special hydrazine solution for desulfurization and denitrification of chimney flue gas with high desulfurization and denitrification efficiency, aiming at the defect that ammonia escape generally exists when the selective non-catalytic reduction method is used in the prior art. its preparation method

Method used

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  • Hydrazine solution special for chimney flue gas desulfurization and denitrification and preparation method thereof
  • Hydrazine solution special for chimney flue gas desulfurization and denitrification and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Add 0.13 kg of industrial salt to 91 kg of water, and obtain reverse osmosis water after the first-stage reverse osmosis treatment, pass the reverse osmosis water into the synthesis tank through the pipeline, and spray 6 kg of urea in the synthesis tank with an air compressor at room temperature. Steam or electric heating, so that the temperature of the solution in the synthesis tank is 20-35 ° C, start the electric mixer, stir at a rate of 4000 rpm for 30 minutes, and then use NH 3 Spray method to 1kg liquid NH 3 Spray into the synthesis tank, then add 0.1kg hydrogen peroxide, hydrogen peroxide 2 o 2 The content is 27.5wt%, and the obtained solution has a pH of 8. Finally, 1 kg of lauryl amidopropyl amine oxide is added to obtain a hydrazine solution. The solution is naturally cooled for 6 hours and pumped into a storage tank for later use.

Embodiment 2

[0037] Add 0.2kg of industrial salt to 62kg of water, obtain soft water after first-stage reverse osmosis filtration, pass the soft water into the synthesis tank through the pipeline, and spray 16kg of urea in the synthesis tank with an air compressor at room temperature, and use steam or electric heating , so that the temperature of the solution in the synthesis tank is 20-35 ° C, use an electric mixer to stir at a rate of 4000 rpm for 30 minutes, and then use NH 3 Spray method will 7.5kg NH 3 Spray into the synthesis tank, then add 5kg hydrogen peroxide, hydrogen peroxide 2 o 2 The content is 27.5 wt%, and the obtained solution has a pH of 7. Finally, 9 kg of lauryl amidopropyl amine oxide is added to obtain a hydrazine solution. The solution is naturally cooled for 6 hours and pumped into a storage tank for later use.

Embodiment 3

[0038] Embodiment 3 (right end point)

[0039] Add 0.3kg of industrial salt to 85kg of water, obtain soft water after one-stage reverse osmosis filtration, pass the soft water into the synthesis tank through the pipeline, and spray 11.5kg of urea in the synthesis tank with an air compressor at room temperature, use steam or electric After heating so that the temperature of the solution in the synthesis tank is 20-35°C, use an electric mixer to stir at a rate of 4000 rpm for 30 minutes, then use NH 3 Spray method will 5kg NH 3 Spray into the synthesis tank, then add 3kg of hydrogen peroxide, H in hydrogen peroxide 2 o 2The content is 27.5 wt%, and the obtained solution has a pH of 6.8. Finally, 6 kg of lauryl amidopropyl amine oxide is added to obtain a hydrazine solution. The solution is naturally cooled for 6 hours and pumped into a storage tank for later use.

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Abstract

The invention discloses a hydrazine solution special for desulfurizing and denitrifying chimney flue gas and a preparation method of the hydrazine solution. The hydrazine solution comprises, by weight percentage, 6-18% of urea, 1-8% of NH3, 0.1-5% of hydrogen peroxide, 1-10% of lauramidopropylamine oxide and the balance water. The hydrazine solution has the advantages that the hydrazine solution effectively inhibits volatilization and decomposition of ammonia water and urea under high temperature, ammonia escaping rate in the discharged flue gas is low, ammonia content in the treated flue gas is below 3.98mg / Nm<3>, the desulfurizing and denitrifying rate of the flue gas is lowered by the added lauramidopropylamine oxide, the desulfurizing rate reaches above 96.7%, and the denitrifying rate can reach above 82.4%; compared with a method using an ammonia water solution to perform desulfurization and denitrification, a method using the hydrazine solution to perform the desulfurization and denitrification can save desulfurization and denitrification cost by 30-35%.

Description

technical field [0001] The invention belongs to the field of waste gas pollution control, and in particular relates to a special solvent for desulfurization and denitrification of chimney flue gas and a preparation method thereof. Background technique [0002] Sulfur oxides SOx (mainly including SO 2 , SO 3 ) and nitrogen oxides NOx (mainly including NO, NO 2 ), where SO 2 , NO and NO 2 It is the main component of air pollution and the main substance of acid rain. [0003] Desulfurization and denitrification is to remove or reduce SO in the process of burning coal 2 How to effectively control SOx and NOx in coal combustion is a key problem that needs to be solved urgently in the field of energy saving and emission reduction. [0004] Desulfurization and denitrification technologies include catalytic reduction method, absorption method, solid adsorption method, and clean combustion technology. Among these methods, catalytic reduction method is the most widely used. This...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/79B01D53/60
CPCB01D53/60B01D53/79B01D2251/2062B01D2251/2067
Inventor 周凯周晓红南志祥
Owner 周凯
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