Stack Height Of Furnace Given Design Pressure And Flue Gas Temperature Calculator

Stack Height Formula:

\[ L_s = \frac{P_{Draft}}{0.0342 \times P_{Atm} \times \left(\frac{1}{T_{Ambient}} - \frac{1}{T_{Flue\ Gas}}\right)} \]

Draft Pressure (P_Draft):

Atmospheric Pressure (P_Atm):

Ambient Temperature (T_Ambient):

Flue Gas Temperature (T_{Flue Gas}):

Stack Height (L_s):

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1. What is Stack Height Calculation?

The stack height calculation determines the required height of a chimney or furnace stack to achieve proper draft pressure for venting combustion gases and emissions. It considers atmospheric conditions and temperature differentials to ensure efficient operation.

2. How Does the Calculator Work?

The calculator uses the stack height formula:

\[ L_s = \frac{P_{Draft}}{0.0342 \times P_{Atm} \times \left(\frac{1}{T_{Ambient}} - \frac{1}{T_{Flue\ Gas}}\right)} \]

Where:

\( L_s \) — Stack Height (m)
\( P_{Draft} \) — Draft Pressure (m)
\( P_{Atm} \) — Atmospheric Pressure (Pa)
\( T_{Ambient} \) — Ambient Temperature (K)
\( T_{Flue\ Gas} \) — Flue Gas Temperature (K)

Explanation: The formula calculates the necessary stack height based on the pressure difference created by temperature variations between ambient air and flue gases.

3. Importance of Stack Height Calculation

Details: Proper stack height calculation is crucial for ensuring adequate draft for combustion systems, preventing backdraft, optimizing fuel efficiency, and complying with environmental regulations for emissions dispersion.

4. Using the Calculator

Tips: Enter draft pressure in meters, atmospheric pressure in Pascals, and both temperatures in Kelvin. All values must be positive and valid for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is stack height important in furnace design?
A: Proper stack height ensures sufficient draft for complete combustion, prevents smoke spillage, and helps disperse emissions effectively.

Q2: What factors affect stack height requirements?
A: Temperature differentials, atmospheric pressure, desired draft pressure, and local topography all influence the required stack height.

Q3: How does temperature affect stack draft?
A: Greater temperature differences between flue gas and ambient air create stronger draft due to density differences and buoyancy effects.

Q4: What are typical stack height ranges?
A: Stack heights vary widely from 5-10 meters for small furnaces to over 100 meters for large industrial applications, depending on specific requirements.

Q5: Are there regulatory requirements for stack heights?
A: Yes, many jurisdictions have minimum stack height requirements based on emission types, quantities, and local environmental conditions to ensure proper dispersion.