Method and device for achieving ultra-low emission of sulfur dioxides and nitrogen oxides from flue gas by two-stage ozone oxidation synergistic absorption

A nitrogen oxide and ozone oxidation technology, applied in chemical instruments and methods, separation methods, gas treatment and other directions, can solve the problems of large flue gas temperature fluctuations, large floor space, difficulties, etc., to avoid excessive dosing, high efficiency Absorption and removal, the effect of low pharmaceutical cost

Inactive Publication Date: 2018-10-19
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for non-electric industries such as cement, steel, and coking, it is difficult for SCR technology to achieve efficient and stable denitrification due to low flue gas temperature and large fluctuations.
On the other hand, the limestone / lime-gypsum flue gas desulfurization series SCR denitrification project involves many large-scale equipment, usually occupies a large area, and the cost and operating expenses are also high. It is very difficult to fully promote and apply it to non-electric industries. Therefore, There is an urgent need to develop new efficient multi-pollutant co-processing technologies

Method used

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  • Method and device for achieving ultra-low emission of sulfur dioxides and nitrogen oxides from flue gas by two-stage ozone oxidation synergistic absorption

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Effect test

Embodiment 1

[0028] The present invention firstly provides a device for realizing ultra-low emission of sulfur dioxide and nitrogen oxides in flue gas by synergistic absorption of two-stage ozone oxidation, such as figure 1 As shown, the device includes a primary oxidizer, a primary absorption tower, a secondary oxidizer and a secondary absorption tower, which are sequentially arranged in the flue of the flue gas to be treated, and finally discharge the purified flue gas into the atmosphere. The primary oxidizer ② is placed in the flue before the primary absorption tower ⑦, and the secondary oxidizer ③ is placed in the primary absorption tower ⑦ and the secondary absorption tower flue between. The bottom gas inlet of the primary absorption tower ⑦ is connected to the outlet of the primary oxidizer ②, and the upper gas outlet is connected to the secondary oxidizer ③. Secondary absorption tower The bottom gas inlet is connected to the outlet of the secondary oxidizer ③, and the upper gas ...

Embodiment 2

[0031] The layout of the flue gas purification device is as follows: figure 1 As shown, the type of flue gas to be treated is industrial boiler flue gas. After dust removal, the particulate matter, O 2 , SO 2 and NO content (as NO 2 Count) respectively 45mg / m 3 , 8% (volume percentage), 650mg / m 3 and 420mg / m 3 , the flue gas temperature is 130°C, and the flue gas volume is 250,000m 3 / h,O 3 The total dosage is 76kg / h, 10% (volume percentage) of which is put into the primary oxidizer ②, and 90% (volume percentage) is put into the secondary oxidizer ③. After the primary oxidation, the flue gas passes through the spray device of the primary absorption tower⑦ Countercurrent absorption primary absorption tower ⑦ The absorption liquid uses a mixed solution of by-product sodium hydroxide and sodium hypochlorite with a mass concentration of 10%, and the liquid-gas ratio is 2.4L / m 3 , SO 2 Absorption efficiency of 92%, NO x The absorption efficiency is 30%. The denitrificat...

Embodiment 3

[0033] The layout of the flue gas purification device is as follows: figure 1 As shown, the treatment flue gas category is coke oven flue gas, particulate matter in flue gas, O 2 , SO 2 and NO content (as NO 2 Count) respectively 19mg / m 3 , 9% (volume percentage), 450mg / m 3 and 600mg / m 3 , the flue gas temperature is 140°C, and the treated flue gas volume is 540,000m 3 / h,O 3 The total dosage is 260kg / h, 30% (volume percentage) of which is put into the primary oxidizer ②, and 70% (volume percentage) is put into the secondary oxidizer ③. The first-stage absorption tower ⑦ uses ammonia solution with a mass concentration of 6% as the absorption liquid, and the liquid-gas ratio is 2.5L / m 3 , after the primary oxidation, the flue gas passes through the spray device of the primary absorption tower ⑦ After countercurrent absorption, SO 2 The absorption and removal efficiency is 95%, NO x The absorption efficiency is 40%. The urea solution with a mass concentration of 5% f...

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Abstract

The invention discloses a method and device for achieving ultra-low emission of sulfur dioxide and nitrogen oxide from flue gas by two-stage ozone oxidation synergistic absorption and belongs to the technical field of flue gas pollution control. The method comprises the following steps: enabling to-be-treated flue gas to sequentially pass through a first-stage oxidizer, a first-stage absorption tower, a second-stage oxidizer and a second-stage absorption tower to realize the efficient removal of the nitrogen oxide and obtain purified flue gas; performing defogging treatment on the purified flue gas at the top of the second-stage absorption tower and then emptying; recycling the absorption mother liquor of the second-stage absorption tower till an absorption effect is lost, conveying to a sub-salt oxidation reactor through a pump and then conveying to a subsequent by-product processing process by utilizing air oxidation. The method and the device disclosed by the invention have the benefits that the absorption efficiency of the nitrogen oxide is regulated and controlled through regulating and controlling the addition ratio of O3 subjected to first-stage oxidation and second-stage oxidation, so that the excessive addition of the O3 can be effectively avoided, and the energy consumption is reduced; through the method disclosed by the invention, the nitrogen oxide is reduced into N2, so that the efficient absorption and removal of the nitrogen oxide can be realized, and the secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of flue gas pollution control, and relates to a method and a device for realizing ultra-low emissions of sulfur dioxide and nitrogen oxides in flue gas through two-stage ozone oxidation synergistic absorption. Background technique [0002] SO 2 and NO x As the main pollutant in the atmosphere, it not only directly endangers human health and ecosystem, but also is the precursor of smog, photochemical smog and acid rain. Over the past 20 years, my country has increased the flue gas SO 2 and NO x In terms of emission control, the thermal power industry has generally achieved ultra-low emissions, and non-electric industries such as steel and building materials are gradually implementing ultra-low emissions of flue gas pollutants. At present, the desulfurization and denitrification processes commonly used in industry are limestone / lime-gypsum desulfurization and selective catalytic reduction (SCR) denitrifica...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/76B01D53/78B01D53/56B01D53/50
CPCB01D53/504B01D53/56B01D53/75B01D53/76B01D53/78B01D2251/104B01D2258/0283
Inventor 朱天乐郭小艳孙也谢德援李帅帅
Owner BEIHANG UNIV
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