Industrial Gas Online Detection System

summary:

The monitoring, detection, and control of chemical components in the chemical production process play a crucial role in increasing the yield, reducing consumption, improving product quality, and ensuring safe production of chemical products.

The advantages of using industrial online process chromatography and laboratory chromatography for manual sampling, analysis, and report filling are self-evident. But in the field of chemical industry in China, industrial online process chromatography is almost dominated by products from foreign companies. Due to its high price, it is difficult to widely use it in the chemical industry in China.

With the continuous rise of labor costs in China and the impact of the special environment of chemical enterprises (toxic, polluted, and dangerous), the use of industrial online process gas chromatography is a tool for chemical enterprises to improve the real-time analysis, avoid manual operation errors, improve analysis accuracy, reduce labor intensity, and enhance automation level.

Industrial Gas Online Detection SystemInstrument features:

★ Upright integrated cabinet structure, positive pressure explosion-proof box body, explosion-proof grade: ExPxd Ⅱ CT3, suitable for various explosion-proof places;

The box is made of stainless steel to cope with long-term use in environments with corrosive gases in the factory;

★ Two independently controllable chromatographic column boxes, capable of single machine operation or single sample analysis at different column box temperatures;

★ Support program temperature rise column box with rear door opening, which can achieve analysis of complex samples;

★ Supports gas path control for chromatography with full EPC technology. Realize remote operation of instrument control parameters;

★ Set temperature and pressure sensors inside the box to achieve gas flow correction of the EPC module;

★ Built in pressure detection, abnormal pressure alarm, and protection for 4 gas sources (carrier gas, hydrogen gas, air, power gas);

★ Supports packed column and capillary column injectors; Gas injection with 6-way valve, 10 way valve, 12 way valve, and liquid injection with 0.5ul, 1.0ul, and 1.5ul micro valves;

★ Supports multiple detector modules, including thermal conductivity detector (TCD), flame ionization detector (FID), flame photometric detector (FPD), and electron capture detector (ECD);

★ It has functions such as sample filtration, decompression, and extraction;

★ Built in fiber optic interface enables long-distance data transmission and control;

★ Equipped with NETChrom ® The workstation can support multiple chromatographs (253 units) working simultaneously, achieving data processing and reverse control, reaching the level of the industry;

★ NETChrom ® The Modbus/TCP server built into the workstation facilitates the integration of analysis results into DCS (Distributed Control System); The detection data can be included in the factory's automatic control system and comprehensive information management system;

Main technical indicators:

Temperature controlled area: 8 channels

Temperature control range: 4 ℃ to 450 ℃ above room temperature, increment: 1 ℃, accuracy: ± 0.01 ℃

● Program heating order: 16 orders

● Lift rate: 0.1-39 ℃/min (ordinary type); 0.1-80 ℃/min (high-speed type)

External events: 6 channels; Auxiliary control output 2 channels

● Sample injector types: packed column injection, capillary injection, six way valve gas injection, micro valve liquid injection optional

Number of detectors: 4 (the most numerous); FID, TCD, ECD, FPD, and NPD are optional

● Gas path control: EPC mode optional

EPC and EFC working modes: 2 types; Constant current mode, constant voltage mode

EPC and EFC working gases: 5 types; Nitrogen, hydrogen, air, helium, argon

EPC and EFC lift: 4th order

EPC and EFC control range: pressure: 0-0.6MPa; Flow rate of 0-100mL/min or 0-500mL/min (air);

EPC and EFC control accuracy: pressure 0.01KPa; Flow rate of 0.01 mL/min;

● Pressure sensor:

Accuracy:<± 2% of full scale

Reproducibility:< ±0.05 KPa

Temperature coefficient:< ±0.01 KPa/°C

Range: 0-0.6MPa;

● Flow sensor:

Accuracy:<± 5% of full scale

Reproducibility:<± 0.5% (full scale)

Range: 0-500 mL/min

● Start injection: manual or automatic selection

● Communication interface: 1310nm SC single-mode fiber, The maximum transmission distance is 40km

● Whole machine cabinet structure: 840×1000×456mm

● Bracket installation structure: 840 × 450mm; Fixed bolt: 540 × 410mm;

● Environmental temperature:- 10 ～ 45 ℃

● Relative humidity:< 90%

● Protection level: IP50

Explosion proof level: Positive pressure inflation explosion-proof, explosion-proof level is Ex p Ⅱ CT3

● Instrument air: Instrument (air) air should be oil-free and dust-free at 0.4MPa to 0.6MPa. Consumption: Ventilation status: 10L/min ventilation status: 80L/min

● Power supply: 220VAC±10% 50HZ; 4KW (the largest)

Technical specifications of detector

Hydrogen flame ionization detector (FID):

Detection limit: Mt ≤ 3 × 10-12g/s (n-hexadecane-isooctane solution);

Noise: ≤ 5×10-14A

Drift: ≤ 1×10-13A/30min

● Linear range: ≥ one hundred and six

Thermal conductivity detector (TCD):

Sensitivity: S ≥ 3500mV • ml/mg (conventional) 5000mV • ml/mg (highly sensitive) (benzene toluene solution) (amplification 2, 4, 8 times optional)

Noise: ≤ 10μV

Baseline drift: ≤ 30μV/30min

● Linear range: ≥ one hundred and four

Electron Capture Detector (ECD):

Detection limit: ≤ 1×10-14g/s

Noise: ≤ 0.03mV

Baseline drift: ≤ 0.2mV/30min

● Linear range: ≥ one hundred and three

● Radioactive source: 63Ni

Flame photometric detector (FPD):

Detection limit: (S) ≤ 5 × 10-11g/s, (P) ≤ 1 × 10-12g/s;

Noise: ≤ 0.03mV

Baseline drift: ≤ 0.2mV/30min

● Linear range: ≥ 103（S）,102（P）

With the improvement of industrial automation and the advancement of process gas chromatography technology, process gas chromatography has become an important instrument for process analysis, and its application scope is becoming increasingly wide. At present, process gas chromatography is increasingly used in gas analysis in fields such as petrochemicals, petroleum refining, chemical engineering, and gas industry.

(l) The analysis of raw material components can be accurately analyzed using a process gas chromatograph when testing various gas raw materials. Analysis of the composition of natural gas and synthetic ammonia.

(2) Gas chromatography can be used for quality analysis of gases in petrochemical products, such as online detection and control of the quality of industrial products such as ethylene, propylene, butadiene, and vinyl chloride.

(3) The analysis process of intermediate product reactions in control devices. Gas chromatography can be used to measure and control the reaction efficiency of various devices in production processes such as petrochemicals, such as distillation towers for refined gases, polymerization devices and reactors using gases as raw materials, and applications in circulation systems.

(4) Monitoring and adjustment of abnormal phenomena in industrial equipment. During the production process, process chromatography can analyze and handle abnormal phenomena that occur in the equipment. Such as monitoring acetylene in ethylene plants; Control the hydrogen flow rate and adjust the polymerization degree of polypropylene; Monitor ethylene and other substances in the ethylene oxidation unit. When abnormal phenomena are detected, alarm signals can be promptly issued or closed-loop feedback adjustments can be made.

(5) Analyzing and measuring the production situation of the device, determining the material balance and energy balance of the production device, or analyzing the top gas of the blast furnace in the steel industry, can all make the process chromatograph an important information source for computers.

(6) The application of process chromatography in pollution monitoring is not only used for general process flow, but also for pollution monitoring in environmental protection.