关键词:

石化污泥, 流化床, SO₂, NO_x, 多环芳烃

Abstract:

The test of cocombustion of petrochemical sludge and coal was conducted in a circulating fluidized bed (CFB) test facility, focusing on the influences of mass mixing ratio, secondary air fraction, excess air coefficient and bed temperature on SO₂, NO_x and polycyclic aromatic hydrocarbons (PAHs) emissions characteristicsThe experimental results showed that when mass mixing ratio increased, SO₂ and NO_x concentrations decreased but PAHs emissions increased markedlySO_2 concentration in the flue gas increased but NO_x concentration decreased with increasing secondary air fractionAs excess air coefficient increased, SO₂ concentration decreased but NO_x concentration tended to increasePAHs concentration in the flue gas decreased at first and then increased with the increase in bed temperature or excess air coefficientAfter taking those factors, such as stable combustion and reducing pollutant emissions into account, the following operation parameters are recommended : combustion temperature between 850℃ and 860℃, excess air coefficient of 1.35, secondary air fraction 40% and mass mixing ratio 30%During the test runs, SO₂, NO_x and PAHs concentrations all met the national standard for pollutant emissions.

Key words:

石化污泥, 流化床, SO₂, NO_x, 多环芳烃