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Flue gas dry-type method for simultaneously desulfurizing and denitrating

A technology for desulfurization, denitrification and flue gas, which is applied in the field of flue gas purification, can solve the problems of operating cost, limited reaction activity operating temperature, high equipment investment and operating cost, and large floor space, so as to achieve the removal rate and efficiency, The effect of small footprint and cost reduction

Active Publication Date: 2008-10-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two technologies are often divided into two independent systems due to the limitations of technology and process conditions, resulting in disadvantages such as complex systems, large footprints, high equipment investment and operating costs.
Currently available technologies for simultaneous desulfurization and denitrification mainly include electron beam radiation, pulsed corona, activated carbon, CuO / Al 2 o 3 method, etc., but there are limitations in operating cost, reactivity, operating temperature, etc., and it is difficult to directly apply to most boiler equipment in my country

Method used

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  • Flue gas dry-type method for simultaneously desulfurizing and denitrating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] One composition is: 64wt% SiO 2 , 29 wt% Al 2 o 3 , 5 wt% Fe 2 o 3 , 1 wt% Fe 2 (SO 4 ) 3 , 1wt% CaO circular tube catalysts are closely arranged in a matrix into modules whose growth, width, and height are 150mm×144mm×100mm, and 4 modules are placed in series and vertically, and the interval between adjacent modules is 50mm; a filter screen is arranged before the catalyst bed , grid width 10mm.

[0025] The catalyst bed layer obtained by the above method, at 1050ppm SO 2 , 5% O 2 , 500ppm NO, humidity is 2%, the rest is N 2 In the atmosphere, the space velocity is 5000h -1 , NH 3 Under the test condition that the molar ratio of injection amount to NO content in the flue gas is 1, the denitrification rate is higher than 80%, the desulfurization rate is higher than 60%, and the sulfur capacity reaches 4 %(weight).

[0026] After the catalyst is saturated with sulfur, it is ventilated and calcined at 450°C for 5 hours, and then tested under the same condition...

Embodiment 2

[0028] One composition is: 80wt% SiO 2 , 8 wt% Al 2 o 3 , 8 wt% Fe 2 o 3 , 1 wt% Fe 2 (SO 4 ) 3, 3wt% CaO circular tube-shaped catalysts are closely arranged in a matrix into modules whose growth, width and height are 150mm×144mm×50mm respectively. Two modules are placed in series and vertically, and the interval between adjacent modules is 1000mm; a filter screen is arranged in front of the catalyst bed , grid width 50mm.

[0029] The catalyst bed layer obtained by the above method, at 1050ppm SO 2 , 5% O 2 , 500ppm NO, 10% H 2 O (volume concentration, the rest is N 2 ) atmosphere, the space velocity is 2000h -1 , NH 3 Under the test condition that the molar ratio of the injection amount to the NO content in the flue gas is 1.2, the denitrification rate is higher than 80%, the desulfurization rate is higher than 60%, and the sulfur capacity reaches 6 %(weight).

[0030] After the catalyst is saturated with sulfur, it is ventilated and calcined at 500°C for 2 hou...

Embodiment 3

[0032] One composition is: 61wt% SiO 2 , 18.8 wt% Al 2 o 3 , 20wt% Fe 2 o 3 , 0wt% Fe 2 (SO 4 ) 3 , the circular tubular catalyst of 0.2wt% CaO is closely arranged in a matrix into modules whose growth, width, and height are 150mm×144mm×200mm respectively, and are placed vertically in series with 3 modules, with an interval of 50mm between adjacent modules; a filter is arranged before the catalyst bed Mesh, grid width 50mm.

[0033] The catalyst bed layer obtained by the above method, at 1050ppm SO 2 , 5% O 2 , 500ppm NO, 2% H 2 O (volume concentration, the rest is N 2 ) atmosphere, the space velocity is 20000h -1 , NH 3 Under the test condition that the molar ratio of the injection amount to the NO content in the flue gas is 1.2, the denitrification rate is higher than 75%, the desulfurization rate is higher than 50%, and the sulfur capacity reaches 17wt in the flue gas temperature range of 310 ° C ~ 400 ° C %.

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Abstract

The invention relates to a dry-type method of simultaneous desulfurization and denitration of flue gas, which takes iron-based metallic oxides and modules prepared by flay ash as catalyst of denitriation reaction of selective catalystic reduction and desulfurizer. The method of the invention utilizes one reactor to realize simultaneous desulfurization and denitration; the saturated modules after adsorption can be reused through the way of heat regeneration. The process of the invention is that: leading the boiler flue gas out of a coal economizer, distributing the flow of the flue gas through a first grade air deflector, fully mixing the distributed gas flow with the ammonia sprayed in, going through a second grade air deflector to cause the gas flow to be more even, leading the obtained material sequentially going through the catalystic modules of each layer in a fixed-bed reactor, carrying out oxidation-reduction reaction and combination reaction. The method of the invention has low bed pressure drop, can realize desulfurization and denitration simultaneously, has wide working temperature scope, and the desulfurization and denitration efficiency is over 80 percent by adopting the multi-layer catalyst with 4-17wt percent of sulfur capacity.

Description

technical field [0001] The invention relates to a flue gas dry simultaneous desulfurization and denitrification technology, specifically a fly ash-based simultaneous desulfurization and denitrification catalyst and its industrial application method, belonging to the technical field of flue gas purification. Background technique [0002] SO 2 and NO x It is one of the main pollutants that cause acid rain, which seriously affects and destroys the ecosystem of soil and water, and damages human health. In all human production activities, SO emissions from coal combustion 2 and NOx accounted for the main part. Therefore, to control coal combustion to produce SO 2 and NO x emissions are of great significance. [0003] In order to achieve higher SO 2 and NO x Removal rate, flue gas desulfurization and denitrification technologies widely used at home and abroad mainly include combustion control in the furnace and post-combustion control for flue gas. The cost of combustion c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60B01D53/86F23J15/00
Inventor 吴宁宋蔷姚强
Owner TSINGHUA UNIV
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