The calorific value of coal is usually determined based on the amount of heat released per unit mass of coal, in units of MJ/kg or J/g, or cal/g or kcal/kg.
The significance of measuring calorific value is:
- Pricing basis
- Boiler design parameters
- Boiler operation calculation and important parameters of coal consumption for power supply
- Auxiliary classification index
In China's current national standard GBT213, the method of expressing calorific value is as follows:
The heat of the cartridge :
The calorific value measured by the calorimeter is expressed by Qb. The combustion products are oxygen, nitrogen, carbon dioxide, sulfuric acid, nitric acid, liquid water and solid ash. Since the sulfur and nitrogen oxides are dissolved in water for exothermic reaction, the heat of the cartridge is high. The calorific value emitted by the actual combustion of coal.
High calorific value :
The calorific value of the cartridge minus the heat generated by sulfuric acid and nitric acid gives a high calorific value. According to Qgr, the products of sulfur and nitrogen produced by combustion of coal in the air are sulfur oxides and free nitrogen, so the calorific value of the coal is evaluated.
Low calorific value :
The heat generated by the unit mass of coal in the complete combustion of the boiler is represented by Qnet. Since the coal is discharged by water vapor in the boiler and condensed into water in the cartridge, it is necessary to subtract the vaporization heat of the water before the coal is in the boiler. The heat generated by complete combustion.
Constant pressure heat:
The unit mass of coal is completely burned under constant pressure, and there is heat generated when the work is expanded. Using Qnet, p, ar, the coal is burned to a constant pressure state in the boiler.
Based on the complexity of the conversion of the above-mentioned bases and the processing requirements, modern calorimetry requires advanced data processing techniques.
The C6000 calorimeter can complete the national standard data conversion in a single machine:
The C6000 Omnipotent Oxygen Bomb Calorimeter combines modern technology, variability and automation (both adiabatic, isothermal and dynamic). It meets all standards of oxygen bomb calorimeters such as DIN, ISO, ASTM, GOST and GB. Through the data evaluation function, after the measurement is completed, the measurement results can be expanded and corrected according to relevant domestic or international standards. If you need to store and analyze data, it has a variety of different data interfaces (computer, Ethernet, SD card, balance, printer), which can be adjusted according to the specific application needs of users.
Calwin C6040 calorimeter control and management software conversion:
Calwin C6040 software has a complete set of advanced solutions, concepts and possibilities for IKA calorimeter measurement data management, support management and control of multiple IKA calorimeter devices, powerful data filtering settings database and grouping functions, export excel measurements The format clearly displays all the measurement data and results of the interface, has a control chart view, can print and store the calibration protocol, and supports different international standards such as DIN, ISO, ASTM, GOST and GB. Data management can be performed using Microsoft SQL Server and a connected LIMS system.
About IKA ()
The German IKA Group is a global market leader in laboratory pre-treatment, calorimetric analysis, and mixed dispersion industrial technologies. IKA calorimetry began in 1922 and has been a global leader in technology transfer and innovation for nearly a century. The new C 1 calorimeter sets a new standard for the future development of oxygen bomb calorimeters, and is the smallest automated calorimeter on the market to date. The C 6000 calorimeter offers fast dynamics, classic adiabatic and isothermal three-calorie modes, without any analog calculations, with a precision of 0.05%. Automated operation, calibration and data logging are available via the IKA CalWin Professional Software Platform. Founded in 1910, IKA Group is headquartered in Staufen, southern Germany, with subsidiaries in the United States, China, India, Malaysia, Japan, Brazil, South Korea, the United Kingdom, and Poland.
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