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System and method for oxidizing flue gas NO by ultrasonic atomization of hydrogen peroxide

A technology of ultrasonic atomization and hydrogen peroxide, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of low NO efficiency and invalid decomposition, and achieve good effect, improved efficiency, and high atomization efficiency

Pending Publication Date: 2020-12-29
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a hydrogen peroxide ultrasonic atomization flue gas NO system and method, and solve the problems of low efficiency and serious invalid decomposition of NO in hydrogen peroxide oxidation flue gas

Method used

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  • System and method for oxidizing flue gas NO by ultrasonic atomization of hydrogen peroxide
  • System and method for oxidizing flue gas NO by ultrasonic atomization of hydrogen peroxide
  • System and method for oxidizing flue gas NO by ultrasonic atomization of hydrogen peroxide

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Embodiment 1

[0038] A hydrogen peroxide ultrasonic atomization oxidation flue gas NO system of the present invention, such as figure 1 As shown, it includes an alkali storage tank 1, a hydrogen peroxide storage tank 2, an alkali metering pump 3, a hydrogen peroxide delivery pump 4, a pH meter 5, a mixing tank 6, a hydrogen peroxide ultrasonic atomizer 7, a spray grid 8, and a flue 9; The outlet of the alkali storage tank 1 is connected to the inlet of the alkali metering pump 3, the outlet of the alkali metering pump 3 is connected to the mixing tank 6, the pH meter 5 is installed on the mixing tank 6, the outlet of the hydrogen peroxide storage tank 2 is connected to the inlet of the hydrogen peroxide delivery pump 4, and the outlet of the hydrogen peroxide delivery pump 4 Connect the mixing tank 6, the outlet of the mixing tank 6 is connected to the inlet of the hydrogen peroxide ultrasonic atomizer 7, the top outlet of the hydrogen peroxide ultrasonic atomizer 7 is connected to the spray...

Embodiment 2

[0055] In this preferred embodiment, the concentration of NO in the flue gas is 150mg / m 3 , the lye tank 1 is sodium hydroxide with a concentration of 1%, and the pH value in the mixing tank 6 is adjusted by the alkali metering pump 3 to about 8, and the hydrogen peroxide atomization pool 15 in the hydrogen peroxide ultrasonic atomizer 7 is arranged in five layers. Ultrasonic atomizing plate 12 adopts ceramic glaze atomizing sheet, and each layer of ultrasonic atomizing plate 12 is connected to the shell by a wire. The height is 8cm, the concentration of hydrogen peroxide in the hydrogen peroxide storage tank 2 is 20%, the molar ratio of the atomized amount of hydrogen peroxide to NO in the flue gas is 2, and the compressed air carries ultrasonically atomized hydrogen peroxide droplets through the spray grid 8 In flue gas at 200°C, the oxidation efficiency of NO is 96%.

Embodiment 3

[0057] In this preferred embodiment, the concentration of NO in the flue gas is 200mg / m 3 , the lye tank 1 is ammonia water with a concentration of 1%, and the pH value in the mixing tank 6 is adjusted to about 6 through the alkali metering pump 3. The atomizing plate 12 adopts a ceramic glaze atomizing sheet, and each layer of ultrasonic atomizing plate 12 is connected to the shell by a wire. The concentration of hydrogen peroxide in the hydrogen peroxide storage tank 2 is 10%, the molar ratio of the atomized amount of hydrogen peroxide to NO in the flue gas is 1.4, and the compressed air carries the ultrasonically atomized hydrogen peroxide droplets through the spray grid 8 into the 350°C In the flue gas, the oxidation efficiency of NO is 98.5%.

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Abstract

The invention discloses a system and a method for oxidizing flue gas NO by ultrasonic atomization of hydrogen peroxide. The system comprises a hydrogen peroxide ultrasonic atomizer, a hydrogen peroxide pH value adjusting system and a jet grid arranged in a flue, a atomization outlet is arranged at the top portion of the hydrogen peroxide ultrasonic atomizer, a hydrogen peroxide inlet pipe is arranged on the side wall of the top of the hydrogen peroxide ultrasonic atomizer, and a compressed air pipe is arranged on the side wall of the bottom; the hydrogen peroxide pH value adjusting system comprises a mixing tank, an alkali storage tank and a hydrogen peroxide storage tank; an inlet of the pH meter is connected with the alkali storage tank and the hydrogen peroxide storage tank, and an outlet is connected with a hydrogen peroxide inlet pipe; and an inlet of the spraying grid is connected with the atomization outlet. According to the method, the pH value is adjusted in the hydrogen peroxide conveying process, the hydrogen peroxide is promoted to directionally decompose hydroxyl radicals more easily at high temperature, and the hydrogen peroxide utilization rate is increased; and hydrogen peroxide droplets obtained after ultrasonic atomization are small in particle size, the gas-liquid contact area is increased, the heating process is shortened, the hydrogen peroxide droplets arerapidly heated and cracked by high-temperature hot flue gas, and the problems that NO in hydrogen peroxide oxidation flue gas is not high in efficiency and invalid decomposition is serious are solved.

Description

technical field [0001] The invention belongs to the field of air pollutant purification, is applicable to the oxidation of NO in flue gas in the fields of coal combustion, coking, steel, biomass and the like, and relates to a system and method for ultrasonically atomizing hydrogen peroxide to oxidize flue gas NO. Background technique [0002] Flue gas denitrification technologies mainly include selective catalytic reduction (SCR) and non-selective catalytic reduction (SNCR) denitrification technologies. Among them, SCR denitrification technology is the most widely used, and the denitrification temperature is between 320°C and 400°C. Large and easily poisoned, it is difficult to apply SCR denitrification technology under the conditions of lack of temperature window and complex flue gas composition; while SNCR denitrification efficiency is only 30% to 40%, which is difficult to meet the requirements of emission standards. [0003] At present, denitrification technology is the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/78
CPCB01D53/56B01D53/78B01D2251/106B01D2258/0283
Inventor 杨成龙李阳申建汛赵东明王晓乾赵瀚辰付康丽程广文杨嵩郭中旭
Owner XIAN THERMAL POWER RES INST CO LTD
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