One Question per Day (February 7, 2018)
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What does the calorific value of artificial gas refer to? The ratio of the calorific value of artificial gas to the square root of its relative density
In gas engineering, when exchanging different types of gases, it is necessary to consider characteristic indices that measure the magnitude of heat flow. When the pressure in front of the burner nozzle remains constant, the thermal load Q of the burner is proportional to the calorific value H of the gas, and inversely proportional to the square root of the relative density of the gas; this value is known as the Btu number.
The Huaji number is an important parameter reflecting the characteristics of gas
The ratio of the calorific value of artificial gas to the square root of its relative density
The Whittaker index is a parameter indicating thermal load (heat generation index). Different gas compositions with the same calorific value index can release the same heat load at the same combustion pressure. The low calorific index is the net heat value of the gas under test divided by the square root of its relative density. Low calorific index = Net heat value / Relative density. The high calorific index is the total heat value of the gas under test divided by the square root of its relative density. High calorific index = Total heat value / Relative density
The ratio of the calorific value of artificial gas to the square root of its relative density
The ratio of the calorific value of artificial gas to the square root of its relative density
The ratio of the calorific value of artificial gas to the square root of its relative density
The Wobbe index is a parameter that represents the characteristics of gas; it was first proposed in 1926 by the Italian scientist Wobbe, and is also known as the Wobbe number. It is now widely used across various countries. If the calorific value and density of the two gases are different, as long as their heat of combustion is equal, they can deliver the same heat load at the same gas pressure and on the same burner. If the calorific value of one of the gases is higher than that of the other, then its heat load is also greater than that of the other. Therefore, the Huashi number is also known as the heat load index. If the two burners have similar heat release rates, swapping them allows the burners to maintain similar heat loads and primary air coefficients. If the calorific value of the replacement gas is higher than that of the reference gas, the thermal load on the burner will increase during replacement, while the primary air coefficient will decrease. Therefore, the Huai number is an interchangeability index. Countries stipulate that the change in calorific value when switching between the two types of gas should not exceed ±5% to 10%.
When the pressure in front of the burner nozzle remains constant, the thermal load Q of the burner is proportional to the calorific value H of the gas, and inversely proportional to the square root of the relative density of the gas