1、 The principle and development of coal quality analysis instruments, laboratory equipment, calorimeters

1. Principles of coal quality analysis instruments, laboratory equipment, calorimeters

The testing principle of a calorimeter is to first use a substance with a known calorific value (usually benzoic acid) to measure the calorific value required to raise the temperature of the entire calorimetry system by one degree, that is, to measure the heat capacity of the calorimeter. For example, if the calorific value of benzoic acid is known to be 26500J/g, burning 1g of benzoic acid can increase the calorimetry system by 2.65 ℃, then the measured heat capacity of the calorimeter is 10000J/℃; If burning 1g of coal with unknown calorific value can increase the calorimetry system by 2 ℃, the calorific value of the tested coal sample is 20000J/g. If it increases by 2.5 ℃, the calorific value of the tested coal sample is 25000J/g.

2. Development of coal quality analysis instruments, laboratory equipment, calorimeters

At present, in addition to domestically produced calorimeters, there are also models produced by LECO in the United States and IKA in Germany, including constant temperature, adiabatic, and double dry calorimeters. But regardless of the model or manufacturer, it has not yet deviated from the basic mode since the birth of the first calorimeter in 1881, which includes a system of basic components such as a water jacket (usually referred to as an outer cylinder), an inner cylinder, and a combustion chamber (usually referred to as an oxygen bomb). For over a hundred years, especially in the past 20 years, with the rapid development of computer technology, calorimeters have made significant improvements in structure and operation mode, greatly improving automation, faster testing speed, and higher precision and accuracy.

Due to the high demand for automatic temperature tracking technology, adiabatic calorimeters of this type are relatively rare in the market. Double dry calorimeters are basically not produced due to their complex oxygen bomb structure and strict environmental requirements. Therefore, this article mainly discusses constant temperature calorimeters.

2、 Improvement suggestions and ideas for coal quality analysis instruments, laboratory equipment, calorimeters

Since its inception, the oxygen bomb calorimeter has undergone over a hundred years of transformation, with significant improvements in appearance, structure, function, and operation mode. From a usage perspective, it has a higher degree of automation, simpler operation, and higher efficiency; From a maintenance perspective, the failure rate is lower and maintenance is more convenient because they are mostly modular structures, making replacement very easy and fault inspection very intuitive. However, there are still some areas that need further improvement and refinement for this type of calorimeter:

1. Fixed temperature outer barrel

2. Electric heating capacity

3. Reverse buckle oxygen bomb

4. miniaturization of the entire machine

5. Diversified functions

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