How many types of heat generation indicators are there?

How many types of heat generation indicators are there?

There are three primary methods for expressing the calorific value of fuels, with their distinctions stemming from differences in measurement conditions and practical application scenarios:

‌Gross Calorific Value (GCV)‌

Directly measured via bomb calorimetry, it includes the latent heat of water vapor in combustion products and requires corrections for the heat effects of sulfur and nitrogen oxides.

‌Higher Heating Value (HHV)‌

Derived from the gross calorific value after correcting for sulfur and nitrogen heat contributions, it accounts for the latent heat released during water vapor condensation and is predominantly used in theoretical calculations.

‌Lower Heating Value (LHV)‌

Obtained by subtracting the latent heat of water vapor vaporization from the HHV, it more closely reflects the practically utilizable heat from combustion. In China, this is typically adopted as the standard unit (e.g., MJ/kg or kcal/kg).

The LHV of standard coal is 29.27 MJ/kg (7000 kcal/kg).

The fundamental difference between HHV and LHV lies in whether the latent heat of water vapor condensation is included.

GB/T213-2008 "coal calorific determination method", GB/T483-2007 "coal analysis test method general provisions", JC/T1005-2006 "cement black raw material calorific determination method", GB/T384 "petroleum products calorific value determination method".

Controlled by single chip microcomputer, LCD Chinese display temperature, time, accurate and reliable, intuitive display, easy to operate.

The instrument has automatic ignition, automatic mixing, automatic printing test results.

Real-time display of temperature-time curve, automatic judgment of ignition circuit on and off.

reasonable structure, reliable performance, with fault display function, easy to learn and easy to use.

The test time of single sample is about 15min, and the test results can be used as arbitration analysis.