NR1726

NEWS RELEASE                                                                                                       FEBRUARY 2013

Boosting Air Pollution Export Sales

Overcoming language and knowledge barriers is necessary for successful export of air pollution control systems and products. This is the advice offered by McIlvaine in its Air Pollution Management service.

Several European nations along with Japan and the U.S. are funding programs to boost export of domestic air pollution control systems and components. One challenge is the lack of experience and knowledge and another is the fluency with English technical terms. The fact that the Asians in general incorrectly use denitration or dentrification instead of DeNOx to describe the reduction of NOx in the stack gases is testimony to the problem.

Before exporting countries can successfully communicate, it is necessary to precisely classify the products to be exported. In fact, there are no comprehensive and precise definitions and classifications for the latest air pollution control technologies. There was no agreement on ways to clean NOx catalyst until McIlvaine formed a committee of catalyst suppliers who agreed that there are really only three ways to treat existing catalyst for reuse:

Top of Form

Bottom of For

        
  

Descriptor

  
  

Chinese    Descriptor

  
  

Definition

  

 Cleaning Catalyst

 催化剂除

 A dry process that utilizes   vacuum and compressed air to mechanically remove as much of the flyash   accumulation as possible.

 Regeneration Catalyst

 催化剂再

 “Catalyst cleaning” followed   by a wet chemical process to remove decay compounds plus re-impregnation of   the catalytic compound(s).

 Rejuvenation Catalyst

 催化剂复

 “Catalyst cleaning” followed   by a wet chemical process to remove some decay compounds with minimum removal   of catalytic compound(s). There is no re-impregnation of the catalytic compound(s).

These three methods have now been defined and precise translations created in Chinese.

There are a number of ways to reduce NOx. These have been summarized in the McIlvaine Global Decisions Orchard.

DeNOx Decisively   Classified Options for Coal, Cement, Incineration

Option

*

Details

SCR

E

Ammonia injection followed by a   catalytic reactor

 

A

High efficiency and accepted by   regulatory authorities

 

D

Cost, catalyst plugging, space

SNCR

E

Urea injection in the furnace

 

A

Low cost, low maintenance, space

 

D

Low efficiency, ammonia slip

Ozone

Oxidation

E

Ozone injection followed by scrubber

 

A

Little space if scrubber already in   place

 

D

Ozone cost, efficiency

Hydrogen

Peroxide

E

Chemical injection converts to NO2   followed by scrubbing

 

A

Low capital cost if scrubber already   in place

 

D

Chemical cost

Catalytic

Filter

E

Fabric filter has embedded catalyst

 

A

Lower foot print with combination,   lower capital and operating cost

 

D

Lack of experience

*   E= explanation     A=advantages       D=disadvantages

The sequence of decision making for the specifier is unique. Here is the sequence recommended for decisions on monitoring ammonia slip from a gas turbine:

Ammonia Slip Monitor Selection for Gas Turbine SCR System

 

Decision Sequence

Decision

Category

Decision Subject

Explanation

Level 1

Orientation

Specifier

Purchaser or A/E making the decisions   for bid purposes

Level 2

Application

221112 –

Fossil Fuel 化石燃料

Gas-fired 燃气

Also applicable for coal-fired power   plants, incinerators and cement kilns

Level 3

Process

NOx Reduction

Can be used with both SCR and SNCR

Level 4

Location

SCR Outlet

Measure ammonia slip

 

Level 5

Pollutant

NH3

Ammonia which escapes SCR

 

Level 6

Product

CEM

Continuous emission monitor to measure   ammonia after reaction with NOx

Level 7a

Type

In situ

 

Big differences between measuring in   stack and taking a small sample and conditioning and treating it

Level 7b

Type

Extractive

Extract sample, condition and measure

Level 8a

Principle

Laser Spectroscopy

(TDL IR)

 

Advantages: Interference free, in situ   or extractive

Disadvantages: Moisture interference,   limited experience

 

Level 8b

Principle

Automated Wet Chemistry

Advantages: familiarity, quick set up   and good for extractive periodic testing

Disadvantages: labor intensive,   reagents

Level 8c

Principle

NOx Differential

Advantages: Tried and proven

Disadvantages: Poor sensitivity to   high NOx levels

Level 8d

Principle

UV Photometry

Advantages: Tried and proven

Disadvantages: Strong interference   from SO2

Level 8e

Principle

Ion Mobility

Advantages: Sensitive and interference   free

Disadvantages: Not suited for   corrosive gases, slow response

Level 8f

Principle

IR-Multi

Component

Advantages: Multiple species

Disadvantages: Cost

Exporting countries and companies need to promote the decisive classification of the products which they wish to sell. All decision making is a series of classifications. A clear presentation of the alternatives will facilitate better decision making. This will be one of the most cost effective ways to expand exports.

For more information on Air Pollution Management, click on: http://home.mcilvainecompany.com/index.php/component/content/article?id=48#n5ab