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Exhaust gas treatment method and denitrification/SO[3] reduction apparatus

A treatment method, flue gas technology, applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve problems such as increasing SO3 concentration, and achieve the effects of low treatment cost, cost reduction, and concentration reduction

Active Publication Date: 2016-07-27
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even in the exemplary case cited in Patent Document 1, when ammonia is consumed by the denitration reaction in the process of denitrifying the combustion flue gas, the oxidation reaction represented by the following formula (1) proceeds remarkably, and thus may increase SO 3 concentration
Furthermore, although reduction of SO in flue gas from combustion is achieved through the use of reducing agents consisting of carbon monoxide (CO) and hydrocarbons 3 The method is known, but expensive iridium (Ir) is used in the catalyst (for example, Patent Document 2)

Method used

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  • Exhaust gas treatment method and denitrification/SO[3] reduction apparatus

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no. 1 approach

[0044] figure 1 A first embodiment is shown in which the denitration / SO according to the present invention is 3 The reduction equipment is arranged to the backflow side of the boiler. for figure 1 , will deNOx / SO 3 The reduction device 5 is arranged on the backflow side of the flue gas flue 2 of the boiler in which the flue gas is produced in the combustion furnace 1 .

[0045] The boiler burns externally supplied fuel in the combustion furnace 1 and discharges the combustion flue gas produced by the combustion into the flue gas flue 2 . DeNOx / SO arranged on the backflow side of flue gas flue 2 3 The reduction plant 5 simultaneously performs NO for the combustion flue gas flowing through the flue gas flue 2 x Denitrification and SO 3 Restore processing. In the description given here and in the claims, SO will be used to 3 Revert to SO 2 processing called "SO 3 recovery process".

[0046] The ECO3 arranged in the combustion flue gas flue 2 in which the combustion flu...

no. 2 approach

[0085] will refer to figure 2 Detailed description of the denitration / SO according to the present invention 3 A second embodiment of the reduction apparatus. In this embodiment, the same denitration / SO as in the first embodiment described above will be provided with the same reference numerals and symbols 3 Elements of the apparatus are reproduced, and detailed descriptions thereof will not be repeated. Denitrification / SO according to the present embodiment 3 The reduction device 15 includes a catalyst layer divided into a first catalyst layer and a second catalyst layer and a first injection device disposed therebetween, and denitration / SO 3 The reduction device 15 differs from the denitration / SO according to the first embodiment described above in this point 3 Restore device 5.

[0086] for figure 2 , will deNOx / SO 3 The reduction device 15 is arranged in the combustion flue gas flue 2 and comprises at least: a first injection device 16 configured to add a first add...

no. 3 approach

[0097] will be referred to below image 3 Detailed description of the denitration / SO according to the present invention 3 A third embodiment of the reduction apparatus. In this embodiment, the same elements as those of the first and second embodiments described above will be provided with the same reference numerals and symbols, and detailed descriptions thereof will not be repeated. Denitrification / SO according to the present embodiment 3 The reduction device 25 differs from the denitration / SO according to the second embodiment in this point 3 Reduction device 15: The first injection device and the first catalyst layer are arranged on the front flow side of the second injection device and the second catalyst layer.

[0098] for image 3 , will deNOx / SO 3 The reduction device 25 is arranged into the combustion flue gas flue 2 and comprises at least: a first injection device 26 , a second injection device 27 , a first catalyst layer 28 and a second catalyst layer 29 . Den...

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Abstract

The present invention provides: an exhaust gas treatment method by which treatment costs are lower than in the past, which efficiently reduces the concentration of SO[3] in a combustion exhaust gas, and which reduces the quantity of NOX; and a denitrification / SO[3] reduction apparatus. This exhaust gas treatment method comprises adding a compound that contains H element and C element as a first additive to a combustion exhaust gas that contains SO[3] in addition to NOX in an oxidizing atmosphere, and then bringing the combustion exhaust gas into contact with a catalyst that contains, as a carrier, oxides of at least one element selected from among the group consisting of Ti, Si, Zr and Ce and / or a mixed oxide and / or composite oxide of two or more elements selected from among this group, thereby reducing SO[3] to SO[2].

Description

technical field [0001] The present invention relates to a flue gas treatment method and denitration / SO 3 Reduction plant, and more particularly a flue gas treatment method and denitration / SO for the treatment of combustion flue gas including sulphur trioxide 3 Restore the device. Background technique [0002] In general, in order to prevent air pollution, a flue gas treatment method and a flue gas treatment apparatus for treating combustion flue gas generated from various combustion furnaces have been strongly desired. Such flue gases include oxides of nitrogen (NO x ) and a large amount of sulfur oxides (SO x ). Handling NO x when already applied which will NO x Contact with a denitration catalyst to decompose it into nitrogen (N 2 ) and water (H 2 O) method. in SO x medium, sulfur trioxide (SO 3 ) is corrosive and due to SO 3 The blockage and dew point corrosion of the flue gas treatment facilities (such as air preheaters and electric precipitators) caused by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01J23/10B01J23/22B01J23/28B01J23/30B01J23/34B01J23/652B01J23/75B01J23/755B01J29/076
CPCB01J23/10B01J29/076Y02A50/20B01J21/063B01J23/6527B01J23/462B01J35/04B01J21/066B01J23/63B01J37/0215B01J37/08B01J37/0248B01D2258/0283B01D2251/208B01D53/8625B01D2251/2062B01D2255/1026B01D2255/20707B01D2255/20776B01D2255/20723B01D2255/30B01D2255/20715B01D2255/2065B01D2255/2073B01D2255/20746B01D2255/20753B01D2255/20769B01D53/50B01D53/8609B01D53/8637B01D53/60B01J23/22B01J23/28B01J23/30B01J23/34B01J23/652B01J23/75B01J23/755B01D53/86B01D53/8628B01D53/90B01D2255/40B01D2257/302B01D2257/404
Inventor 东野耕次泽田明宏藤川圭司米村将直
Owner MITSUBISHI HEAVY IND LTD
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