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Device for eliminating N2O within exhaust gas and method for eliminating N2O

A technology of gas and gas flow paths, which is used in combustion methods, separation methods, chemical instruments and methods, etc.

Active Publication Date: 2015-01-14
METAWATER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009]However, even if the N2O decomposition rate is exchanged below the specified value, the catalyst still has N22O decomposition ability whose / sub>O decomposition rate is below the specified level has not fully utilized the N2O decomposition capacity of the catalyst in the above-mentioned conventional technology that frequently exchanges the entire amount of the catalyst. The stage of 2O decomposition energy wastes the catalyst in vain, and as a result, there is a problem that the total usage of the catalyst increases

Method used

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  • Device for eliminating N2O within exhaust gas and method for eliminating N2O
  • Device for eliminating N2O within exhaust gas and method for eliminating N2O
  • Device for eliminating N2O within exhaust gas and method for eliminating N2O

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Experimental program
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Embodiment

[0055] use figure 1 N shown 2 O removal device will implement N in waste gas of sewage sludge incinerator 2 The results of trial calculation of the amount of catalyst necessary for the O removal treatment are shown below. The N 2 O removal device has filled with each 4m 3 Catalysts have 10 layers of catalyst filled layers, with a total of 40m 3 catalyst.

[0056] The catalyst is the following iron-zeolite catalyst.

[0057] (catalyst type)

[0058] An iron-zeolite catalyst produced by the method described in Patent Document 1 was used. In addition, the iron-zeolite catalyst used in the test was produced according to the method described in Patent Document 1, and was in the form of pellets with a diameter of 2 mm x a length of 5 mm, and the zeolites were β-type and MFI-type.

[0059] (Catalyst Performance Evaluation)

[0060] The following formula is the space velocity A / Hr, exhaust gas temperature 450°C, and ammonia added to NH 3 / N 2 N under the condition that O m...

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Abstract

By use of an N 2 O removing system comprising a plurality of gas flow passages 1 and catalyst packed layers 2 packed with N 2 O decomposition catalysts, which are alternately arranged, wherein the gas flow passages 1 next to each other via the catalyst packed layers 2 comprise a gas introduction passage 11 and a gas discharge passage 12, and wherein the respective gas flow passages are provided with valves 3 sequentially opened along with the deterioration of N 2 O catalysts due to their time-dependent changes to cumulatively increase the number of the catalyst packed layers used, the valves 31 and 32 are opened along with time-dependent changes after the beginning of N 2 O removal treatment, thereby cumulatively increasing the number of the catalyst packed layers 2 used.

Description

technical field [0001] The invention relates to the removal of N in waste gas discharged from sewage sludge incinerators, etc. 2 O device and N 2 O removal method. Background technique [0002] Exhaust gas from sewage sludge incinerators, boiler exhaust gas from thermal power plants, and automobile exhaust gas contain a small amount of N 2 O (nitrous oxide). N 2 O is one of the greenhouse gases. The global warming coefficient is 310, which brings 310 times the global warming effect of carbon dioxide. Therefore, from the viewpoint of preventing global warming, it is strongly required to reduce N 2 O emissions to the atmosphere. [0003] Publicly used N in the past 2 O decomposes the catalyst to reduce and remove N in the exhaust gas 2 O's technology. As an industrially available N 2 The mainstream of O decomposition catalysts is iron-zeolite-based catalysts in which iron or iron ions are carried on zeolite. 4 Stir and mix with a ball mill at room temperature, calc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01J29/072
CPCB01J29/46B01J29/7615B01J2229/186B01J35/023B01D53/8631B01D53/9427B01D2258/01B01D2257/402F23J2219/10B01J29/072B01J35/026B01J35/04B01D2255/9045B01J37/0246B01D2255/50Y02C20/10B01D2255/20738B01D2258/0283F23J15/02B01D2258/0291F23J2215/101B01J35/50B01J35/56B01J35/40B01D53/00B01D53/56B01D53/86
Inventor 山田正树佐佐木统一郎野入菜摘
Owner METAWATER CO LTD
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