What would the flue gas symptoms be if there were too much airflow?

What would the flue gas symptoms be if there were too much airflow?

Too much excess air leads to lower flame temperature. That means less heat gets into the system. Also, excess air must heat up to flue gas temperature, which consumes extra energy.

What happens when too much excess air is supplied to the furnace in the process of combustion of coal *?

What happens when too much excess air is supplied to the furnace in the process of combustion of coal? If the excess air is supplied above this amount, there is a loss of heat in the furnace. In such cases, the supply of air to the hearth is cut short or the rate of fuel supply is increased.

What happens when excess air enters the furnace?

Many operators of industrial furnaces are losing significant amounts of energy because of too much air entering the furnace, resulting in heat loss through flue gases. The excess air results in oxygen that isn’t consumed during combustion, and this oxygen absorbs otherwise usable heat and carries it out of the stack.

What is significance of excess air?

Excess air ensures that there is enough air for complete combustion. Excess air is expressed as a percentage of theoretical air required. Thus, 10% excess air indicates that 110% total air is being supplied. In boiler operation, excess air represents a heat loss.

What is the main reason to use excess air for a combustion reaction?

In order to ensure complete combustion, combustion chambers are fired with excess air. Excess air increases the amount of oxygen and nitrogen entering the flame increasing the probability that oxygen will find and react with the fuel.

How do you determine excess air level in a furnace?

To measure excess air in the furnace an excess oxygen analyser is provided to measure the excess O2 in flue gases. In cases where the excess oxygen analyser is not available or not reliable, the air/fuel ratio must be monitored to prevent the burners from operating incorrectly and affecting combustion.

What happens when there is too much primary air?

Too much primary air— Primary air is the air mixed with the gas before it’s ignited. Too much primary air makes the gas-air mixture hard to light, causing gas to build up. Too little gas at the burners—Like too much air, not enough gas makes it hard for the gas-air mixture to ignite.

What could result if a flame is adjusted with too much primary air?

FT. If flue gases are not vented properly, carbon monoxide poisoning could result. The gas flame will lift off the burner and be noisy if it receives too much primary air.

How does excess air affect the vent gas CO2 percentage?

Excess air is added to insure complete combustion. This reduces the CO2 percentage by adding more air than is used in the combustion process.

Which of the following may be a cause of problems in a gas furnace?

If a gas furnace’s flame characteristics change when the ____ comes on, severe deterioration of the heat exchanger may be indicated. Which of the following may be a cause of problems in a gas furnace? Improperly sized vents and malfunctioning air filters.