At what temperature do flue gases condensate?

around 135°F.
Flue gas will form and condense on a heat exchanger and in the boiler stack when it falls below its dew point, and this occurs when the return water temps of the system are around 135°F.

What is the dew point temperature of the water Vapour in the combustion flue products?

If the combustion end products are cooled, the dew point of the combustion process of methane with standard air is reached at a temperature of 59.6à‚°C. At that temperature, the exhaust gas is saturated with water vapour. Cooling of the exhaust gas below 59.6à‚°C will make that water vapour condense.

Why dew point adjustment is needed in the natural gas treatment?

To avoid condensation of heavy components when the gas pressure reduces in the delivery system, the HDP of natural gas also needs to be reduced as necessary.

What is Sulphur dew point?

The dewpoint of sulfuric acid depends on the concentration of sulfur trioxide in the flue gas, but is typically about 280°F (138°C).

What is boiler flue gas dew point?

While the precise dew-point for sulfuric acid depends on the sulfur-trioxide concentration, at 10 parts per million sulfur trioxide in the flue gas, the dew-point is 280o F. Dew-point corrosion is exacerbated in coal-fired boilers by the presence of fly ash.

How can condensation be avoided in a flue?

Here is the bottom line: The only way to avoid sustained flue gas condensation is to monitor the boiler’s inlet water temperature and react to that temperature by limiting the rate at which heat moves from the boiler to the distribution system.

What is the dew point of fuel?

The hydrocarbon dew point is the temperature (at a given pressure) at which the hydrocarbon components of any hydrocarbon-rich gas mixture, such as natural gas, will start to condense out of the gaseous phase. It is often also referred to as the HDP or the HCDP.

What’s a normal dew point?

Most people are comfortable with a dew-point temperature of 60 degrees Fahrenheit (16 degrees Celsius) or lower. At a higher dew point of, for example, 70 F (21 C), most people feel hot or “sticky” because the amount of water vapor in the air slows the evaporation of perspiration and keeps the body from cooling.

Which dew point is better or?

General comfort levels USING DEW POINT that can be expected during the summer months: less than or equal to 55: dry and comfortable. between 55 and 65: becoming “sticky” with muggy evenings. greater than or equal to 65: lots of moisture in the air, becoming oppressive.

Does sulfur in the fuel change the dew point?

During the combustion process, the sulfur contained in fuel undergoes oxidation. This leads to acid dew point, which is the highest level of temperature where acid deposition can take place.

What is Boiler dew point?

With regards to boilers, dew point is important as it allows the heat exchanger to work at its most efficient; the condensing of the water vapour releases additional energy into the heating system. The dew point of the byproducts created when burning natural gas is around 55 ℃.

How is dew point calculated?

How do I calculate dew point? To calculate the dew point: Measure the temperature and relative humidity of the air. Multiply 17.625 by the temperature and divide the result by the temperature plus 243.04.

What is the formula for dew point?

Td = T – ((100 – RH)/5.) where Td is dew point temperature (in degrees Celsius), T is observed temperature (in degrees Celsius), and RH is relative humidity (in percent). Apparently this relationship is fairly accurate for relative humidity values above 50%.

How much condensate does a gas boiler produce?

An efficient condensing boiler will generate around 2 litres of condensate water an hour at a temperature of around 30-40°c. This needs to be safely disposed of, within the buildings waste water system.

How is condensation formed in a flue?

Flue gas condensation is a process, where flue gas is cooled below its water dew point and the heat released by the resulting condensation of water is recovered as low temperature heat. Cooling of the flue gas can be performed either directly with a heat exchanger or indirectly via a condensing scrubber.

How is gas dew point calculated?

The dew-point temperature ( ) of a sample of air with vapor pressure is the temperature to which it must be cooled to become saturated, i.e. it is defined by the equation e = e s ( T d ) .

What is dew point in HVAC?

The dew point is an accurate predictive value that indicates the temperature at which moisture will condense out of the air. Liquid moisture condensing on surfaces can cause staining, creates a ideal environment for mold growth and left unabated can result in structural deterioration of many building components.

Why is dew point important?

By definition, the dew point is the temperature at which the air is completely saturated and can’t hold any more moisture. This is where comfort comes into play. Higher dew points mean more moisture can be held in the atmosphere, and vice versa.

How can dew point be reduced?

There are two basic methods for mechanical systems to dehumidify the air and lower the dew point. One method is to sub-cool and reheat. Sub-cooling followed by reheating is the most common method of dehumidification in large building systems.