The technology of the sixth generation hydrogen sulfide online analyzer

Tunable diode laser (TDL)

Continuous online measurement
Measurement of hydrogen sulfide content in natural gas, 0~500 ppm H2S

Outlet of desulfurization/cleaning agent for amine solution

Before the export/liquefaction of natural gas treatment plants to pipelines
Natural gas pipeline
Injection/extraction of underground storage
Detection of pipeline corrosion
Natural gas transfer
Biogas from landfill pits
Measurement after desulfurization
Gas transfer
• Sturdy design
NEMA 4X / IP66
0~50 ° C ambient temperature
90 inside (height) x 100 centimeters (width) x 27.5 centimeters (thickness) D1
86 kilograms (D1)
Explosion proof certificate
CSA Division 1 & 2

ATEX / IECEx Zone 1 & 2

• Electricity consumption
80 watt DC
110 watt AC
Multiple flow paths
Up to 4 flow paths
Human Machine Interface (HMI)
Local display screen, keyboard
Access level of operators and technicians
Graphic User Interface (GUI)

Browser based (any browser works)
Only accessible within the local area network (secure!)
Don't worry about whether the software has been updated
Mobile phones and computers can be used for remote instrument operation
communication
4-20mA analog output, isolated (self powered)

4-20mA analog input, isolated (self powered or loop powered)
Modbus TCP/IP or serial port (RS485)

Ethernet
Digital input
• Analysis cycle
Process gas is sampled by a probe
Suspended particles and liquids are eliminated by filters
The pressure and flow rate of the process gas are regulated
Pre processed process gas enters the measurement chamber
The infrared light emitted by the laser enters the measurement room
Infrared light is absorbed by hydrogen sulfide, and the intensity of the light reaching the detector decreases
The absorbance is directly proportional to the concentration of hydrogen sulfide
• Vacuum pump
Reduce the pressure inside the measurement chamber to 200 Torr (0.26 bar)
Reduce the broadening of spectral peaks
Avoid overlapping spectral peaks
No need for air purifier
Proprietary algorithm
Noise caused by laser intensity
The sensitivity of the instrument is affected by low-frequency noise from the detector signal
Modulation of light wavelength
The wavelength of the light emitted by the laser is modulated at high frequencies
Extract the weak absorption signal of hydrogen sulfide from the noisy background
The bottom limit of zero absorbance intensity is set
Detect at high frequency
Eliminating noise issues
Requirements for process gas
¼ "outer diameter inlet/outlet
1-2 bar process gas pressure
1-3 liters/minute process gas flow rate
No suspended solids/water
Temperature of process gas from 0 to 100 ° C (temperature must be above the dew point of hydrocarbon gas/water)
Extract process gas from the instrument
Gas, excluding condensable liquids
The pressure and temperature of process gas are basically determined by the environment
Optional Process Gas Pre treatment System
Equipped with pressure regulator and filter
• Operational challenges
Pollutants have an impact on the ability of amine solutions to absorb hydrogen sulfide
Conditions for Corrosion Caused by Hydrogen Sulfide Combined with Water
The malfunction of amine liquid gas purifier has a significant impact on the quality of natural gas
negative effect
The amine solution is too weak, and the corrosion rate is faster
There is too little rich amine solution (that is, amine solution that has absorbed hydrogen sulfide) in the air purifier, and the consumption of consumables (electricity, steam, etc.) is high
There is too much rich amine liquid in the air purifier, which causes more corrosion
• Measurement plan
0~50 ppm H2S at the outlet of natural gas desulfurization system
Optimize the lifespan of amine solution between update cycles
Reduce the cost of consumables for the reboiler of the regenerator
Immediately detect the breakthrough of hydrogen sulfide
Preventing corrosion damage within natural gas plants