Microcomputer Automatic Calorimeter AVHW-9D

Microcomputer Automatic Calorimeter AVHW-9DMainly used for measuring the calorific value of combustibles in thermal detection institutions and coal standard analysis. Capable of automatically measuring in strict accordance with the relevant provisions and methods of the national standard GB/T213-2008. Therefore, this embedded calorimeter is widely used in industries or departments such as power, coal, metallurgy, petrochemicals, coalification, environmental protection, cement, papermaking, geological exploration, agriculture and animal husbandry, pharmaceutical research, and teaching to measure the calorific value of solid or liquid combustibles such as coal, petroleum, cement raw materials, grain, and feed.

1. Compliance with standards:

GB/T213-2008 "Method for determination of calorific value of coal"

GB/T384-1981 "Method for determination of calorific value of petroleum products"

JC/T1005-2006 "Method for determination of calorific value of cement black raw materials"

ASTM-D5865-2010 "Test Method for Total Calorific Value of Coal and Coking Coal"

GB/T30727-2014 "Method for determination of calorific value of solid biomass fuels"

The requirements of ISO 1928-2009 "Solid mineral fuels - Determination of total value and calculation of net calorific value using a bomb calorimeter".

2. Main features and functions:

Adopting a modular 24 bit AD temperature acquisition circuit ensures a temperature measurement accuracy of one ten thousandth bit.

The temperature measurement module adopts ultra-low temperature drift characteristic electronic components to ensure the stability of test results.

Using embedded ARM as the main control chip, equipped with a 10 inch true color touch screen and mouse device, it achieves simpler and more flexible operation; The direct human-computer interaction method is more convenient to use. Automatically adjust the temperature of the inner and outer cylinders to make the measurement results more accurate.

Having powerful data processing capabilities and good scalability, it has achieved the expression of instruments. Querying and printing historical data has become simple and easy, providing compatible possibilities for future device networking and data sharing.

The same data processing speed as the previous "personal computer+controller" mode enhances reliability.

Real time cooling correction with relaxed requirements for ambient temperature. The data of sulfur, hydrogen, and water can be supplemented and automatically converted into high and low calorific values after the experiment is completed, which is more in line with the conventional experimental process.

The experimental process of water injection, drainage, mixing, ignition, temperature collection, calculation, calibration, and printing is fully automated, avoiding human errors and greatly improving accuracy and precision.

The display adopts a 10 inch ultra large touch screen display, which displays a very rich, intuitive, and clear amount of information, and supports the viewing of files or documents. You can view the national standard requirements, experimental methods, and experimental steps for coal testing methods.

The device is designed with an integrated appearance, which is easy to install and replace, and has more reliable performance.

3. Testing principle:

The calorific value of coal is measured in an oxygen bomb calorimeter. A certain amount of sample is analyzed and burned in an oxygen bomb filled with excess oxygen. The heat generated by the combustion is conducted by the cylinder wall to a certain amount of inner cylinder water and calorimeter system (including inner cylinder, oxygen bomb, stirring blade, temperature probe) for absorption. The temperature rise of water is proportional to the heat released by the combustion of the sample.

Thermal capacity is the amount of heat absorbed by a calorimeter system for every 1 ℃ increase, measured in J/K. The thermal capacity is determined by burning a certain amount of the reference calorimeter substance benzoic acid under similar conditions.

When measuring the calorific value, the calorific value of the sample cylinder can be obtained by correcting the additional heating such as ignition heat based on the temperature rise and system heat capacity generated by the calorimeter before and after ignition of the sample, in joules per gram (J/g).

After deducting the heat of formation of nitric acid and the correction heat of sulfuric acid (the difference between the heat of formation of sulfuric acid and sulfur dioxide) from the heat of heat generated by the cartridge, the high heating value is obtained.

After correcting the gasification heat of the moisture in coal (the original water in coal and the water generated by hydrogen combustion), the low calorific value of coal is obtained.

4.Microcomputer Automatic Calorimeter AVHW-9DTechnical Specifications:

Reference heat capacity: approximately 10500 (J/K);

Outer bucket water capacity: approximately 40L;

Inner bucket water capacity: approximately 2.1 L;

Ignition voltage: AC: 220V;

Ignition time: 3-6 seconds (adjustable);

Temperature measurement range: 0.0000 ℃ -65.000 ℃;

Resolution: 0.0001 ℃;

Measurement accuracy: superior to the national standard GB/T213-2008;

Usage environment: Room temperature 5-40 ℃ (each measurement of room temperature change should be ≤ 1 ℃), relative humidity ≤ 85%;

Power supply: 220V ± 10% 50Hz;

Instrument power: 80W;

Instrument size: 790mm × 540mm × 430mm;

Instrument weight: approximately 40kg.