NOx Reduction
- Company Name:Tong Yang Magic Co., Ltd.
- Membership:Free Member
- Member Since:2009. 07.10
- Country/Region:Korea
- City:Seoul
- Contact:Moon Seong Cheol
- Related Keywords:NOx Reduction
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Tong Yang Magic Co., Ltd.
[Korea]
General
Nitrogen oxides (NOx) emitted from burining fossils fuels(Coal, natural gas or oil) has been a main pollutant to contruibute to acid rain, urban smog, visibility impairment and global climate changes. The NOx reducing technology has been developed in Germany and Japan, Mid 1970`s. In recent years, many other countries have increased attention to NOx emission prevention. The technology called 'Selective Catalyst Reduction' or SCR is one of the most efficient way to remove NOx.
Soures
Mobil Soures (40%)
Stationary Sources (60%)
Applications
Control of DeNOx
Comparison SCR and SNCR
Description
|
SCR
|
SNCR
|
Initial Costs
|
High
|
Low
|
Temperature
|
200~450��/div>
|
850~900��/div>
|
Efficiency
|
Up to 70%
|
30~60%
|
Catalyst
|
Required
|
Not Required
|
Operating Window
|
Wide
|
Narrow
|
Operation Principal of SCR
Entering the NOx reductuin chamber the incoming air is mixed with required amount of Ammonia or Urea, homogeneously
As the incoming air flows pass through the catalyst layer, NOx react with Ammonia or Urea on the surface of the catalysts and form harmless Nitrogen(N2) and water(H2O)
4NO + 4NH3 + O2 → 4N2 + 6H2O
2NO2 + 4NH3 + O2 → 3N2 + 6H2O
Pre-heater is installed to heat the air steam up to optimum operating temperature (200~400��
To reduce the operating costs the abator unit has a recuperative heat exchanger bullt in, by which outgoing air is to heat the incoming air steam
Constituents and Feature of Catalyst
Active
material |
Substrate
|
Feature
|
Temperature
(�� |
V2O5
|
SiO2
|
Reduction ability is lower than that of TiO2 substrate.
|
250~300
|
V2O5
|
Al2O3
|
The oxidation reaction is more pre-ominant than reduction.
|
250~300
|
V2O5
|
TiO2
|
High sulfur resistance , Most common use
|
300~350
|
Pd
|
α Al2O3
|
High performance in activity of low Temperature.
|
250~300
|
Pt
|
α Al2O3
|
Easily poisoned by sulfur components.
|
250~300
|
Pt + Ru
|
α Al2O3
|
High performance in activity of low Temperature.
|
250~300
|
Zeolite
system. |
Wide operation window.
|
300~450
|
|
Zeolite
system. |
Cr, Cu
|
High performance And wide operation window.
|
300~450
|
Consideration in theDesign SCR
Required Design Factor
Advantage of the SCR System designed by TYMAGIC and LESNI A/S
Usage of catalyst, which has the most efficent performance, produced by BASF. Design capability of SCR required operating temperature and low Dust/High Dust etc. Design technology of the SCR package system containing heat exchanger and steam heater, etc. Ability of supplying the catalyst for Dioxin control. Experience in contruction of SCR system in power plant, Incineration plant, and chemical plant
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