Coke exhaust gas treatment

Currently, most coke plants serving the metallurgical industry use traditional coking coal pyrolysis technology. The output products of the  plant are coke, coke oil, light oil…

Coke emissions come from coke burners used to produce iron and steel. Coke emissions are complex mixtures of dust, polluted gases often including carcinogens such as cadmium and arsenic. Chemicals recovered from coke emissions are used as raw materials to produce items such as plastic, solvents, dyes, paints and insulation materials.

 

What are the components of coke emissions?

Coke emissionsare produced under oxygen-free conditions during thecarbonization process athigh temperatures and contains many toxic substances, including coal dust, sulfur oxides, sulfur dioxide (SO₂ ), nitrogen oxide (NO_x), ammonia, benzene, phenolic compounds, polycyclic aromatic compounds and carbon monoxide (CO).

Sources of coke emissions

Coke emissions from coal loading process

During this process, dust is generated from loading coal into the furnace. This dust is visible when coal is loaded into the furnace from coal trucks.

Coke emissions coming from the furnace door

Emissions at the furnace door occur due to overpressure at the furnace during the coking process. Coke emissions escape through gaps and cracks on the furnace door surface.

The coke oven is operated at positive pressure to ensure air does not enter the coke oven. Air entering the furnace will damage the furnace and the quality of the coke.

Emissions from furnace door leaks are the largest source of emissions from coke ovens and are a major source of polycyclic aromatic hydrocarbons (PAHs). Exhaust gas  may also contain dust, CO, SO₂, H₂S and NH₃…

Coke oven door

 

Coke emissions from cooling process

The process of cooling hot coke with water. Usually produces a large stream of steam. Dust suspended and organic compounds escape into the environment through water vapor

Steam from cooling

How dangerous are coke emissions?

Coking coal emissions are the main occupational hazard of the steel, aluminum, electricity and construction industries. Coke emissions affect humans through breathing and absorption through the skin. Long-term exposure of workers to coke emissions can cause conjunctivitis, dermatitis and damage to the respiratory and digestive systems.

Polycyclic aromatic hydrocarbons (PAHs) are the main harmful components of coke emissions. More than 16 types of PAHs are present in coke emissions such as benzo[a]pyrene (BaP), benzoanthracene and phenanthrene.

Coke oven workers are directly exposed to PAHs through inhalation or skin. As a representative of PAHs, BaP is highly toxic to human health.

Many studies demonstrate that long-term exposure to BaP can cause many types of cancer, including lung cancer, kidney cancer, liver cancer, and even brain tumors.

Workers working in environments with coke emissions may have an increased risk of cardiovascular disease

Workers working at a coke oven

Coke exhaust gas treatment system

The coke exhaust gas is treated with an air washing tower to reduce temperature and remove dust. Then the gas stream is directed to the adsorption tower. Here, toxic gases and PAH compounds will be removed. After treatment, coke gas will be reused in other stages of the plant

Cooling the coke exhaust gas allows the recovery of by-products, such as naphthalene, benzene, ammonia and hydrogen sulfide, from the condensate stream and the resulting gas stream after cooling.

HASY ENVIRONMENT installs the system exhaust gas treatment coke in Dien Bien

To be able to choose a coke exhaust treatment system that meets the plant’s operational requirements, please call us immediately at 0972221608 or website https://xulymoitruong360.com/ . With reasonable design and installation consultation costs, HASY ENVIRONMENT is the perfect choice for your treatment system.