Particulate emissions (mg/dscm) from combustion units are limited to what value?

Particulate emissions (mg/dscm) from combustion units are limited to what value?

• A. 180 mg/dscm
• B. 100 mg/dscm
• C. 120 mg/dscm
• D. 240 mg/dscm

Answer: (A)

Particulate emissions from combustion units are capped as a concentration in the exhaust gas, expressed on a dry basis per volume of gas. This means the limit is how many milligrams of particulates are allowed for each cubic meter of flue gas after moisture is removed (and often corrected to a reference oxygen level). A value of 180 mg/dscm is a common, practical cap for general combustion processes because it represents a balance between achievable control technology and environmental protection. Meeting it typically requires particulate control equipment such as a baghouse or electrostatic precipitator and proper combustion efficiency. The measurement is done by sampling the stack gas, weighing the particulates collected on a filter, determining the gas volume, and correcting the result to a dry standard basis to express it as mg/dscm. Lower limits (like 100 or 120 mg/dscm) would demand tighter controls, while higher limits (like 240 mg/dscm) are easier to meet but offer less protection. Hence, 180 mg/dscm is the value you’re expected to recall.

Particulate emissions from combustion units are capped as a concentration in the exhaust gas, expressed on a dry basis per volume of gas. This means the limit is how many milligrams of particulates are allowed for each cubic meter of flue gas after moisture is removed (and often corrected to a reference oxygen level). A value of 180 mg/dscm is a common, practical cap for general combustion processes because it represents a balance between achievable control technology and environmental protection. Meeting it typically requires particulate control equipment such as a baghouse or electrostatic precipitator and proper combustion efficiency. The measurement is done by sampling the stack gas, weighing the particulates collected on a filter, determining the gas volume, and correcting the result to a dry standard basis to express it as mg/dscm. Lower limits (like 100 or 120 mg/dscm) would demand tighter controls, while higher limits (like 240 mg/dscm) are easier to meet but offer less protection. Hence, 180 mg/dscm is the value you’re expected to recall.