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SIOD® Brief Introduction of Ion Generator

 

SIOD® Ion generator is composed of pulse discharge equipment and oxidation gas generating equipment, in which pulse discharge equipment releases high-energy electrons under pulse voltage, then ionizes oxygen and water in carrier gas, and utilizes the properties of anisotropic electrodes in pulse discharge area, i.e. electrons, positive and negative ions, and the ability of electrons and ions is uneven. Hence, the unbalanced number of positive and negative ions makes the carrier gas molecules form positive ions and negative ions, and combine with the oxidizing gas (non-ozone) produced in the oxidizing gas generator to form high-energy active ions, so as to improve the oxidizing ability of the oxidizing gas. Then air is diluted to a certain proportion and mixed with flue gas through blower. The gaseous ion oxidizes NO in flue gas to high-valent nitrogen oxides under certain humidity, temperature and oxygen content. The gaseous ion has selectivity for the oxidation of NO and SO2. It oxidizes NO first and SO2 only after excess. By controlling the molar ratio, the ion only oxidizes NO but not SO2

 

When the flue gas enters the improved absorption tower, the oxidized NO becomes high-valent nitrogen oxide, which can be absorbed and reacted by alkaline materials to form nitrate quickly. Because the gas ion is relatively stable and not easy to annihilate, it can not disappear when the flue gas enters the absorption tower, and continues to oxidize NO as the flue gas rises until all NO is oxidized to form high-valent nitrogen oxides. 99.5% of the high-valent nitrogen oxides can be absorbed by alkaline materials, so the removal efficiency of NOx can reach more than 99%, and the emission index of NOx can reach the standard of less than 10mg/Nm3, and reach the near-zero target.

Application conditions of ion generator:

lSmoke temperature is below 180 degrees Celsius (optimum temperature is 80-120 degrees Celsius)

lThe residence time in flue gas is longer than 1S (the optimum residence time is 1.5S).

lSmall amount of steam and compressed air demand

Oxidation characteristics of ion generator (compared with ozone): 

 

Contrastive analysis of main denitrification processes of sintering machine:

 

Serial number

project

Low Temperature SCR Denitrification Process

Activated coke denitrification process

Ozone denitrification process

Denitrification Process of Ion Generator

One

Investment

250,000/10,000 cubic meters of flue gas

400,000/10,000 cubic meters of flue gas

200,000/10,000 cubic meters of flue gas

160,000/10,000 cubic meters of flue gas

Two

Layout position

After desulfurization, the catalyst is greatly disturbed by sulfur.

After desulfurization, the analytical process may escape.

Before desulphurization

Before desulphurization

Three

Equipment Composition

Rotary heat exchange system, sealed air system, ammonia storage gasification dilution heating system, hot blast stove system, ammonia injection grid system, SCR denitrification reactor, catalyst storage filling and replacement system, etc                 

Storage and replacement system, analysis system, dilution heating system for ammonia storage and gasification, screening system of activated coke for denitrification                  

Ozone generation system, generator cooling system, oxygen preparation system, flue cascade reactor

Raw material storage and transportation system, ion generator body, flue reactor

Four

Area covered

large

large

in

Small

Five

Secondary pollution

Ammonia escape increases haze risk

Ammonia Escape, Active Coke Resolves NOx Escape

ozone

nothing

Six

Denitrification efficiency

≥80%

60%

75%

≥90%

Seven

Operation cost of denitrification

10 yuan/ton mine

12 yuan/ton mine

9 yuan/ton mine

9 yuan/ton mine

Eight

By product

Catalysts need to enter hazardous waste treatment process

Activated char incineration, heavy metal cycle

Most of the sulphites are produced and need to be disposed of at a cost.

Formation of sulphate for sale (cement or mixing plant can be used directly)

 

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