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A flue gas treatment method for catalytic reduction of doped lanthanum-based perovskite-type composite oxide and simultaneous desulfurization and denitrification

A composite oxide and perovskite type technology, applied in the field of environmental protection science, can solve the problems of low desulfurization and denitrification efficiency, difficult separation and recovery of auxiliary products, etc.

Active Publication Date: 2019-06-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using this method can achieve the purpose of catalytic desulfurization and denitrification at the same time, and can recover high value-added products elemental sulfur and nitrogen, and can also ensure the conversion rate of sulfur dioxide and nitrogen oxides in the flue gas and the recovery rate of product elemental sulfur and nitrogen. The existing technology has the problems of low efficiency of simultaneous desulfurization and denitrification and difficulty in separation and recovery of by-products

Method used

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  • A flue gas treatment method for catalytic reduction of doped lanthanum-based perovskite-type composite oxide and simultaneous desulfurization and denitrification
  • A flue gas treatment method for catalytic reduction of doped lanthanum-based perovskite-type composite oxide and simultaneous desulfurization and denitrification
  • A flue gas treatment method for catalytic reduction of doped lanthanum-based perovskite-type composite oxide and simultaneous desulfurization and denitrification

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Experimental program
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Effect test

Embodiment 1

[0021] Example 1: Both A-site and B-site are doped with La 0.6 Y 0.4 Ni 0.6 W 0.4 o 3 Catalytic reduction and simultaneous desulfurization and denitrification

[0022] Load 10g of catalyst La in the reactor of tubular resistance furnace 0.6 Y 0.4 Ni 0.6 W 0.4 o 3 First pass nitrogen for 5 minutes, then start to heat up, and feed nitrogen at the same time. When the temperature rises to 570°C, feed a mixed gas (30% by volume of nitrogen monoxide, 30% by volume of carbon monoxide, and the rest are nitrogen). It is 7000mL / (g h), and the aeration time is 120 minutes. The exhaust gas is detected by a flue gas analyzer after passing through a condensation tank, and then passed into lime water to recover nitrogen. Elemental sulfur and carbon are calculated by gravimetric method. The denitrification efficiency is 100%, the desulfurization efficiency is 95.7%; the recovery rate of elemental sulfur is over 96.5%, and the N 2 The recovery rate is 97.1%, indicating that it has a ...

Embodiment 2

[0023] Example 2: La doped with both A-site and B-site 0.7 Ce 0.3 mn 0.8 Bi 0.2 o 3 Catalytic reduction and simultaneous desulfurization and denitrification

[0024] Load 10g of catalyst La in the reactor of tubular resistance furnace 0.7 Ce 0.3 mn 0.8 Bi 0.2 o 3First pass nitrogen for 5 minutes, then start to heat up, feed nitrogen at the same time, feed mixed gas (sulfur dioxide volume percentage is 7%, nitrogen monoxide volume percentage is 7%, nitrogen dioxide volume percentage is 7% when heating up to 560 ℃) , the volume percentage of carbon monoxide is 35%, and the rest is nitrogen), the space velocity is 10000mL / (g h), the aeration time is 120 minutes, the exhaust gas is detected by the flue gas analyzer after passing through the condensation tank, and then the nitrogen is recovered after passing through the lime water , elemental sulfur and carbon are calculated by gravimetric method. The denitrification efficiency is 100%, the desulfurization efficiency is 9...

Embodiment 3

[0025] Example 3: La doped with both A-site and B-site 0.6 Sr 0.4 Fe 0.5 al 0.5 o 3 Catalytic reduction and simultaneous desulfurization and denitrification

[0026] Load 10g of catalyst La in the reactor of tubular resistance furnace 0.6 Sr 0.4 Fe 0.5 al 0.5 o 3 First pass nitrogen gas for 5 minutes, then start to heat up, and feed nitrogen gas at the same time, when the temperature rises to 600°C, feed mixed gas (sulfur dioxide volume percentage is 10%, nitrogen monoxide volume percentage is 10%, nitrogen dioxide volume percentage is 10% , the volume percentage of carbon monoxide is 50%, and the rest is nitrogen), the space velocity is 6000mL / (g h), the aeration time is 120 minutes, the exhaust gas is detected by the flue gas analyzer after passing through the condensation tank, and then the nitrogen is recovered after passing through the lime water , elemental sulfur and carbon are calculated by gravimetric method. The desulfurization efficiency is 95.5%; the deni...

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Abstract

The invention provides a flue gas treatment method for catalytic reduction as well as simultaneous desulphurization and denitration with a doped lanthanum-based perovskite type composite oxide The lanthanum-based perovskite type composite oxide with simultaneously doped A position and B position is used as a catalyst, mixed gas of flue gas containing sulfur dioxide or nitrogen oxide (nitric oxide and nitrogen dioxide) and carbon monoxide passes through the catalyst at 450-650 DEG C, catalytic reduction reactions are carried out for sulfur dioxide and nitrogen oxide as well as carbon monoxide separately, sulfur dioxide is reduced and converted to sulfur, after cooling, elemental sulfur is recovered, nitrogen oxide is reduced and converted to nitrogen, tail gas is absorbed by alkali liquor and nitrogen is recycled, so that the purpose for desulphurization and denitration at the same time is realized, elemental sulfur with high added values and nitrogen in the tail gas are recovered, and the tail gas reaches the current discharge standard. The desulphurization efficiency reaches 95% or above; the denitration efficiency reaches 99.9% or above, the recovery rate of elemental sulfur reaches 95% or above, and the recovery rate of N2 reaches 97% or above.

Description

technical field [0001] The invention belongs to the field of environmental protection science, and relates to a flue gas treatment method for catalytic reduction of doped lanthanum-based perovskite-type composite oxides and simultaneous desulfurization and denitrification. Background technique [0002] At present, desulfurization and denitrification technologies are divided into two categories: (1) Selective catalytic reduction method: using a reducing agent to reduce SO 2 as elemental sulfur and / or reduction of NOx to N 2 , to achieve desulfurization and denitrification; (2) Oxidation method, using an oxidant to oxidize water-insoluble NO to generate NO 2 , thus with SO 2 At the same time, it is absorbed in the lye in the later stage to achieve the purpose of desulfurization and denitrification. The application of the oxidation method is limited because the oxidant is expensive and the products are difficult to separate. The reduction method uses catalyst recycling, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/60
CPCB01D53/8637B01D2255/2063B01D2258/0283Y02A50/20
Inventor 何汉兵秦毅红孙立国
Owner CENT SOUTH UNIV