GB/T 33690-2017 in English

Background Introduction:

With the adjustment of global energy structure and the improvement of environmental protection requirements, coal liquefaction technology, as an important part of clean coal technology, has received extensive attention. GB/T 33690—2017 "Autoclave Test Method for Coal Liquefaction Reactivity" is an important standard in the field of direct coal liquefaction, which is used to determine the reaction performance of coal under high pressure, high temperature and hydrogen conditions.

Method Summary:

The standard stipulates that coal, catalyst and solvent are added to the autoclave and the hydrocracking reaction is carried out at a specific temperature and pressure. The oil yield and conversion rate are calculated by analyzing the gas products and liquid and solid products.

Key instruments:

Autoclave (Intermittent mechanical stirring autoclave): core equipment used to simulate the reaction environment of direct coal liquefaction. The main technical parameters include volume, pressure range, temperature control and stirring speed.

Test steps:

1. Sample preparation and treatment: Coal samples need to be dried to a moisture content of ≤3%.
2. Autoclave loading: Add coal samples, catalysts and solvents in sequence to ensure sealing.
3. Gas replacement: Use nitrogen and hydrogen for multiple replacements to ensure that the reaction environment is oxygen-free.
4. Heating and constant temperature: control the temperature to 450°C and maintain for 120 minutes.
5. Product analysis: sample and analyze the gas composition, liquid and solid product components and ash content.

Test condition control:

• Ensure the sealing of the autoclave to avoid leakage affecting the results.
• Precisely control the temperature and pressure to ensure that the reaction environment meets the standard requirements.
• Use high-purity reagents to reduce impurity interference.

Data processing:

• Strictly calculate key indicators such as oil yield and conversion rate according to the formula.
• Conduct material balance inspection to ensure the validity of the test results.
• Analyze the causes of abnormal data and record them.

Safety Precautions:

• Hydrogen use must strictly comply with safety regulations to prevent leakage and explosion risks.
• Pay attention to heat insulation protection during high-temperature operation to avoid burns.
• Properly dispose of waste after the experiment to reduce environmental pollution.