Method and device for removing chlorine-containing organic pollutants in flue gas through combination of ozone catalysis and wet process

A technology of organic pollutants and ozone catalysis, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problem of underreporting

Pending Publication Date: 2020-10-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, by injecting O into the flue gas 3 , especially the combination of catalysis and wet absorption for advanced treatment of chlorine-containing organic pollutants has been rarely reported

Method used

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  • Method and device for removing chlorine-containing organic pollutants in flue gas through combination of ozone catalysis and wet process
  • Method and device for removing chlorine-containing organic pollutants in flue gas through combination of ozone catalysis and wet process
  • Method and device for removing chlorine-containing organic pollutants in flue gas through combination of ozone catalysis and wet process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Embodiment 1 is the method and device (combining figure 1 , figure 2 illustrate).

[0080] The method is as follows: before entering the catalytic oxidation reactor 4, the incoming flue gas with chlorine-containing organic pollutants passes through the heat exchanger 1 to control the temperature of the flue gas at 60-130 °C, and the ozone generated by the ozone generator 3 is diluted by the fan. 2 After dilution, it is sprayed into the catalytic oxidation reactor 4 to participate in the reaction. The molar ratio of the amount of ozone added to the concentration of chlorine-containing organic pollutants in the flue gas is 2 to 15 (the specific ratio should be selected according to the type of chlorine-containing organic pollutants and the initial concentration. and target emission concentration), control the catalytic oxidation reaction time for at least 0.2 seconds, and the chlorine-containing organic pollutants in the flue gas are oxidized to HCl, Cl 2 , CO 2 and H...

Embodiment 2

[0082] Embodiment 2 is the method and device (combining image 3 , Figure 4 illustrate).

[0083] The method is as follows, the incoming flue gas with chlorine-containing organic pollutants and relatively large smoke content enters the water film dust collector 10 after passing through the catalytic oxidation reactor 4 . In the water film dust collector 10, HCl, Cl 2 And the particles will be quickly and efficiently removed by the droplets in the tower space, so as to realize the removal of chlorine-containing organic pollutants and particles. Other steps are identical with embodiment 1.

Embodiment 3

[0085] Embodiment 3 is ozone low temperature synergistic oxidation NO x Method and device for combined wet absorption with chlorinated organic pollutants (combined figure 1 , figure 2 illustrate).

[0086] The method is as follows, with NO x And the incoming flue gas containing chlorine organic pollutants enters the catalytic oxidation reactor 4 and then enters the wet scrubber 6 . due to NO x The concentration is significantly higher than the concentration of chlorine-containing organic pollutants. The molar ratio of ozone dosage and NO concentration in the flue gas is dynamically adjusted from 0.5 to 1.5. The residual ozone can complete the oxidation of low-concentration chlorine-containing organic pollutants in the flue gas. In the catalytic oxidation reaction, NO in flue gas is oxidized to high-valence nitrogen oxides (NO 2 , N 2 o 5 ), the chlorine-containing organic pollutants in the flue gas are oxidized to HCl, Cl 2 , CO 2 and H 2 O. In addition, SO in flue...

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Abstract

The invention relates to a method and a device for removing chlorine-containing organic pollutants in flue gas through a combination of ozone catalysis with a wet process. The method comprises the following steps: introducing to-be-treated flue gas and ozone into a reaction unit, and carrying out a catalytic ozonation reaction under the action of a catalyst; allowing oxidized flue gas to enter anabsorption unit to remove soluble pollutants so as to obtain clean flue gas. The invention provides a technology for efficiently, thoroughly and stably degrading chlorine-containing organic pollutantsin flue gas at a low temperature, an ozone coupled catalysis mode is adopted for conversion of the chlorine-containing organic pollutants into HCl, Cl2, CO2 and H2O , and then wet-process alkali liquor absorption is conducted so as to achieve a removal effect of 90% or more.

Description

technical field [0001] The invention relates to the technical field of flue gas pollutant treatment, in particular to a method and device for removing chlorine-containing organic pollutants from flue gas by combining ozone catalysis and wet method. Background technique [0002] At present, my country's air pollution situation is mainly manifested in the dual pressure of winter smog and summer ozone. Volatile organic pollutants (VOCs) and nitrogen oxides (NO x ) is an important precursor for the formation of ozone. The incineration flue gas of fossil fuels, domestic waste and organic solid waste is the cause of VOCs and NO x main source of emissions. In recent years, large-scale coal-fired power plants have high combustion efficiency, VOCs emissions are negligible, NO x Emissions have also been effectively controlled through the popularization of ultra-low emission technologies. The difficulty of flue gas emission control has shifted to small coal-fired boilers, industri...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/78B01D53/76B01D53/70B01D53/68B01D53/60B01D47/02
CPCB01D47/02B01D53/60B01D53/68B01D53/76B01D53/78B01D53/8625B01D53/8662B01D2251/104B01D2255/2073B01D2257/2064B01D2258/0283Y02P70/10Y02A50/20
Inventor 林法伟项力张志满陈冠益颜蓓蓓程占军马文超
Owner TIANJIN UNIV
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