Equipment and Technology

Air Pollution Control

Dust Collector

A kind of equipment that captures and removes particulate matter suspended in the exhaust gas. Various types are prepared according to the nature of particles to be removed.

Dry Process

Electrostatic Precipitator A kind of equipment that captures particles in the exhaust gas by electrically charging them with corona discharge.
Mechanical Type Dust Collector A kind of equipment that captures particles in the exhaust gas by utilizing mechanical force working on them. According to the sizes of the particles collected, the collector could have several types such as gravity, inertia or centrifugal force.
Filtration Type Dust Collector A kind of equipment that captures particles in the exhaust gas by filtration with filter cloth, ceramic filter media, etc.

Wet Process

Scrubber Type Dust Collector A kind of equipment that captures particles in the exhaust gas into a liquid by water spraying or by contacting the gas with water.
Electrostatic Precipitator A kind of equipment that captures particles in the exhaust gas by combining the functions of the electrostatic precipitator and the scrubbing type collector.

Exhaust Gas Desulfurization System

A system that removes sulfur oxides (SOx) in the exhaust gas.

Wet Process

Lime Stone Gypsum Process A process that uses limestone or slaked lime liquor to absorb and remove SO2 in the exhaust gas, and that produces gypsum as a byproduct.
Ammonium Sulfate Recovery Process A process that absorbs sulfur oxides in the exhaust gas by activated carbon, and that recovers them as sulfuric acid or ammonium sulfate.
Soda Absorption Process A process that absorbs sulfur dioxide in the exhaust gas by sodium hydroxide, and that recovers the sulfur as sodium sulfite.
Sulfur Recovery Process A process that sprays a solution of caustic soda, magnesium hydroxides, etc. to the exhaust gas to react with sulfur oxides, and that recovers the sulfur as elemental sulfur or sulfuric acid.
Caustic Soda Process A process that absorbs sulfur dioxide in the exhaust gas with caustic soda and then air-oxidizes the sodium compound to sodium sulfate. Solution containing the sodium sulfate receives another treatment.
Magnesium Hydroxide Process A process that absorbs sulfur dioxide in the exhaust gas with magnesium hydroxide and then air-oxidizes it to magnesium sulfate. Solution containing the magnesium sulfate receives another treatment.

Dry Process

Lime Process A process that adsorbs and removes sulfur oxides in the exhaust gas by blowing limestone into the furnace and lime powder into the flue.
Activated Carbon Desulfurization Process A process that adsorbs and removes sulfur oxides in the exhaust gas by activated carbon.
Lime-Fly Ash Compound Process A process that removes sulfur oxides by the use of steam conditioned absorbent made by mixing coal ash and used desulfurizing agents with lime.

Semi-Dry Process

Flue Spray Process A process that has water spray into the flue to increase sulfur removing efficiency.
Spray Dryer Process A process where slaked lime slurry is sprayed into the exhaust gas to form calcium sulfite by the reaction with sulfur oxides in the gas. Generated calcium sulfite is captured by the precipitator after it is dried by gas-carrying and reaction heat.
Electron Beam Irradiation Process By the irradiation of electron beams, sulfur oxides in the exhaust gas react with ammonia injected into the gas and form ammonium sulfate. Then the generated sulfate is removed by electrostatic precipitators, etc.

Exhaust Gas Denitration System

A system that removes nitrogen oxides (NOx) in the exhaust gas.

Dry Process

Selective Catalytic Reduction Process A process that reduces nitrogen oxides in the exhaust gas to free nitrogen and water by the reaction with injected ammonia in the presence of catalysts.
None Catalytic Process A process that has direct injection of ammonia into the incinerator at temperatures around 900 degrees C and does not need any catalysts.
Combustion Modification Process A process where incineration conditions are controlled to reduce incomplete combustion and generation of nitrogen oxides.
Activated Carbon Adsorption Process A process that uses activated carbon to adsorb nitrogen oxides in the exhaust gas.

Wet Process

Alkaline Scrubbing Process A process that sprays alkaline solution into the exhaust gas to absorb nitrogen oxides in the gas and remove them.

Greenhouse Effect Gas Control

Technology that separates carbon dioxide from the exhaust gas and stores it.

Absorption Process A process that uses alkaline solution to selectively absorb carbon dioxide by the chemical reaction.
Others Other greenhouse gas control processes.

Exhaust Gas Treatment System for Other Contaminants

A system that removes contaminants in the exhaust gas other than dust, sulfur oxides, and nitrogen oxides.

Adsorption Process A process that removes and detoxifies harmful contaminants in the exhaust gas by adsorbent.
Absorption Process A process that removes harmful contaminants in the exhaust gas by absorbent. There are two systems, dry and wet absorption.
Direct Combustion Process A process that heats up the exhaust gas and decomposes hazardous substances in it by combustion.
Regenerative Combustion Process A process that decomposes hazardous substances in the exhaust gas by combustion, and that improves combustion efficiency by increasing the gas temperature with the use of accumulated heat from the combustion.
Catalytic Combustion Process A process that decomposes hazardous substances in the exhaust gas by combustion, utilizing catalysts and making the gas odorless.
Biological Process A process that decomposes hazardous substances in the exhaust gas by the use of microorganisms.
Others Other exhaust gas treatment systems.
© The Japan Society of Industrial Machinery Manufacturers