Method for reducing and removing nitrogen oxide by adsorption-oxidation and liquid phase absorption

A nitrogen oxide and liquid phase absorption technology, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of affecting the service life of catalysts, expensive engineering costs, high operating costs, etc., and achieve good economic and environmental benefits, The effect of reducing the generation of waste and reducing the consumption of materials

Inactive Publication Date: 2016-08-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has the following problems: the engineering cost is extremely expensive, the operating cost is also very high, and the floor area is large; the amount of ammonia in the reaction process needs to be precisely controlled, and ammonia gas leakage is prone to occur; the reaction temperature is high and the temperature window is na...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Grind and sieve the H-ZSM-5 molecular sieve to obtain a granular molecular sieve with a particle size of 12-32 mesh, dry it in a muffle furnace at 500°C for 2 hours, and then put it into a drying dish filled with silica gel to cool to room temperature;

[0030] (2) get 3g silicon-aluminum ratio and be that 25H-ZSM-5 molecular sieve is placed in fixed-bed reactor, will contain nitrogen oxide (volume concentration is 0.1%~0.15%) and oxygen (volume concentration is 20.8%) mixed gas ( The total flow rate is 6L / min) through the adsorbent bed, and the adsorption reaches saturation at 10°C to 30°C;

[0031] (3) The molecular sieve after saturated adsorption is heated up to 500° C. in a WF-01 type differential integration reactor for desorption regeneration, and the nitrogen dioxide in the desorption gas accounts for 82% of the total volume of nitrogen monoxide and nitrogen dioxide;

[0032] (4) Use nitrogen or air as the carrier gas, control the volume concentration of ni...

Embodiment 2

[0034] Same as Example 1, the molar concentration of the sodium sulfite solution is 0.07mol / L, and other conditions remain unchanged, and the conversion rate of the final reduction of nitrogen oxides to nitrogen is measured to be 82%.

Embodiment 3

[0036] (1) Grind and sieve the H-ZSM-5 molecular sieve to obtain a granular molecular sieve with a particle size of 12-32 mesh, dry it in a muffle furnace at 500°C for 2 hours, and then put it into a drying dish filled with silica gel to cool to room temperature;

[0037] (2) Take 3g of silicon-aluminum ratio and place 150H-ZSM-5 molecular sieve in a fixed bed reactor, and mix gas (total flow rate) containing nitrogen oxides (volume concentration 0.1%~0.15%) and oxygen (volume concentration 20.8%) 6L / min) through the adsorbent bed, and the adsorption reaches saturation at 10°C to 30°C;

[0038] (3) The molecular sieve after saturated adsorption is heated up to 500° C. in a WF-01 differential integration reactor for desorption regeneration, and the nitrogen dioxide in the desorption gas accounts for 84% of the total volume of nitrogen monoxide and nitrogen dioxide;

[0039] (4) When the molar concentration of sodium sulfite is 0.035mol / L, the oxidation degree of imported nitro...

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Abstract

The invention discloses a method for reducing and removing nitrogen oxide by adsorption-oxidation and liquid phase absorption. The method comprises the following steps: (1) letting exhaust gas containing nitrogen oxide to pass through a fixed bed reactor filled with a molecular sieve to oxidize part of the nitrogen oxide and adsorb the nitrogen oxide on the molecular sieve; (2) stopping feeding the exhaust gas, feeding carrier gas (air or nitrogen), and performing heating desorption on a bed layer of the molecular sieve in a WF-01 differential integral reactor; (3) absorbing desorbed gas with a sodium sulfite in a filler tower, to finally reduce the gas into nitrogen. According to the method disclosed by the invention, efficient and low-cost removal of the nitrogen oxide is realized; desorbed nitrogen dioxide is 80 percent or higher of the total volume of the desorbed nitrogen oxide; after the gas is absorbed and reduced with the sodium sulfite solution, the denitrification rate can be up to 80 percent or higher.

Description

technical field [0001] The invention relates to the treatment of nitrogen oxides in flue gas in various production processes, in particular to a method for removing nitrogen oxides in flue gas by combining adsorption oxidation with liquid phase absorption and reduction, and reducing them to nitrogen. Background technique [0002] Nitrogen oxides are one of the main sources of air pollution. Their emissions can not only cause acid rain and photochemical smog, but also destroy the ozone layer, causing serious harm to the natural environment and human production and life. Therefore, the flue gas must be denitrified before being discharged. deal with. [0003] At present, there are two kinds of mature flue gas denitrification technologies: selective catalytic reduction and non-selective catalytic reduction. The non-selective catalytic reduction denitrification effect is poor, and the denitrification rate is generally about 40%. At present, the most widely used and most promisin...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/04B01D53/78B01D53/82
CPCB01D53/56B01D53/04B01D53/0438B01D53/565B01D53/78B01D2253/1085B01D2259/40088
Inventor 张光旭张国孟王战科
Owner WUHAN UNIV OF TECH
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