I have a question for everyone: What is the calorific value of gas? Is the weight of the components related to the calorific value?

Calorific value is an important indicator representing the quality of fuel in fuel chemistry. The heat released when a unit weight (or volume) of fuel is completely burned. 　　It is usually determined using a calorimeter (calorimeter meter), or calculated from the results of fuel analysis. There are two types: higher calorific value and lower calorific value. The former is the total of the heat of combustion of the fuel and the heat of condensation of water vapor, that is, the total amount of heat released when the fuel is completely burned. The latter is merely the heat of combustion of the fuel, that is, the difference between the total heat and the heat of condensation. The common unit of calorific value is kJ/kg (for solid and liquid fuels), or kJ/m^3 (for gaseous fuels). 　　The heat released when 1 kilogram (cubic meter) of a certain solid (gaseous) fuel burns completely is known as the calorific value of that fuel. It is a property of the substance, denoted by the symbol q, and its unit is joules per kilogram, expressed as J/kg (or J/m^3). 　　Formulas for calculating the heat released upon complete combustion of solid fuels: Q = mq. Formulas for calculating the heat released upon complete combustion of gaseous fuels: Q = Vq. Here, Q represents the heat energy in joules, q represents the calorific value in J/(kg*°C), m represents the mass of the solid fuel in kilograms, and V represents the volume of the gaseous fuel in cubic meters. 　　q=Q/m (solid) ； q=Q/v (for gases) 　　W=Q=mq=Q/m. W=Q=Vq=Q/v (W: total work). The contents of various components in the fuel vary, and so does their heat value. They are mainly combustible components, such as hydrogen, carbon monoxide, methane, hydrocarbons, etc.

Boilers designed domestically generally use the lower heating value, that is, it does not include the heat generated by the condensation of water vapor. Abroad, high calorific value is used for calculations.

Calorific value: The heat released when a unit weight (or volume) of fuel is completely burned. It is related to the components, particularly the amount of water produced during combustion, which in turn relates to the issues of lower and higher heating values.

The calorific value of gas refers to the heat generated during its combustion; there is also the issue of whether the water produced is in liquid or gaseous form. If the water is in liquid form, it is the higher calorific value, while if it is in gaseous form, it is the lower calorific value. The calorific value of gas is related to its composition; in other words, the composition of the gas directly determines its calorific value!

Question: A mixed gas, with measured components of 75% H2, 24% CO2, 1% CO, and methane. Help: 1. I don’t know what the calorific value of this mixed gas (75% H2, 24% CO2, 1% each of CO and methane) is 2. It must be cooled to ≤60°C before it can be used by the equipment. Is this mixed gas still in a gaseous state after being cooled to 20–60°C? I hope experts will kindly offer their guidance. QQ: 2592899833

The low calorific value ranges from 8.18 MJ/liter to 8.41 MJ/liter

Thank you to the person above. So, also on a per unit volume basis, natural gas has a heat value of 36 MJ/m³, which is about 4 times that of my mixed fuel?