GH/T 1318-2020 in English
VALIDDetermination for thermal decomposition gaseous products of cotton
- Issued on:2020-12-07
- Implemented on:2021-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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| Standard No: | GH/T 1318-2020 |
| Document status: | VALID |
| Title in English: | Determination for thermal decomposition gaseous products of cotton |
| Title in Chinese: | 棉花热解气体产物测定方法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-12-07 |
| Implemented on: | 2021-03-01 |
| ICS Classification: | 65.020-Farming and forestry |
| Chinese Classification: | B93-Agricultural products and feed processing machinery |
| Related Topics: | Pyrolysis
cotton product gas molecule Liquid Thermal Decomposition Products dalton hotspot method of determination untie product standard gas molecule Pyrolysis system Pyrolysis furnace GH 2 gh/t Pyrolysis furnace Gas determination method Pyrolysis products type of gas Gas solubility determination method Test method for gas-producing components of electrolyte Plant digestion method gh/t 1161 |
本标准规定了棉花热解气体产物测定方法的术语和定义、测量原理、仪器设备、环境要求、试样制备、测量方法、试验结果和试验报告。
本标准适用于皮棉、棉短绒热解气体产物种类的实验室分析测定。
Introduction
Analysis of Standard Technical Framework
| Core Module | Technical Requirements | Innovation Points |
|---|---|---|
| Pyrolysis System | Temperature Range 25-1300℃ Temperature Control Accuracy ±1℃ | Multi-gas Environment Simulation Capability |
| Gas Chromatography-Mass Spectrometer | Reproducibility ≤0.5%RSD Acquisition Frequency ≥200Hz | 300℃ High Temperature Transmission Pipeline |
| Data Analysis | Triple error control system (time/peak area/molecular weight) | Intelligent database comparison |
Detailed explanation of key technical indicators
The standard requires that the tubular pyrolysis furnace must achieve a linear temperature increase of 0-100℃/min, and with a temperature control accuracy of ±1℃, it can accurately simulate the thermodynamic process of cotton from room temperature to ignition point. The connecting pipeline is made of electrically heated stainless steel to maintain a constant temperature of 300℃ to prevent gas condensation.
In terms of detection sensitivity, the retention time error is specified to be ≤0.0008min, and the detection limit of characteristic gases such as 3-pentene-1-ol and furfural reaches the ppm level.
Implementation and Application Guide
Typical Application Scenarios
A central cotton reserve warehouse used this standard method to monitor the concentration changes of 2-methylfuran and successfully warned of a smoldering accident. The data showed that when the concentration of the substance reached 23ppm (the background value is usually <5ppm), the self-heating phenomenon of the cotton bale at a depth of 2 meters was discovered in time.
Operational Points
- The sample must be pre-treated at constant temperature and humidity for 48 hours
- The switching timing of the six-way valve is controlled at 30±2 seconds
- Parallel test errors exceeding 3% need to be re-measured
Standard Evolution Analysis
Compared with the traditional burning test method, this standard innovatively introduces the programmed temperature-mass spectrometry technology to distinguish the characteristic gases at different pyrolysis stages. After implementation in 2021, the average warning time for cotton storage fires will be 72 hours earlier.
The next step is to add a micro-thermogravimetry-gas chromatography-mass spectrometry module to achieve a breakthrough in the detection of sample volumes from 10g to mg.
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