Beijing Qinglian Measurement and Control Technology Co., Ltd

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Beijing Qinglian Measurement and Control Technology Co., Ltd

Tel：18500242456
Email：sales@qingliancekong.com

Address: Inside Beijing Taixing Art Institute, Shuipo Village, Gaoliying Town, Shunyi District, Beijing

TLG-837

Liquid Sulfur Pool Gas Analyzer

The system is used to monitor H above the liquid sulfur pool in real time. ₂ S and SO ₂ at the appropriate concentration and with a fast response rate to prevent hydrogen sulfide from accumulating beyond safe levels.

Product Features

Performance

Fast, continuous measurement The entire system’s response time is less than 10 seconds. High precision ±1% full scale Excellent off-ratio performance 100:1 H ₂ S:SO ₂ 20:1

Reliability

Continuous online monitoring The system's uptime is above 99.6%. All-solid-state structure No moving parts; no need to replace the filter unit. Fully automated operation under unmanned supervision Automatic system purging and zeroing function; remote automated control Customizable alarm and signal outputs 4-20 mA analog output; MODBUS; HART, etc.

Security

The sample will not enter the inside of the analyzer housing. Toxic and harmful gases circulate only within the probe itself. The analyzer can be manually operated or the probe can be plugged in and unplugged without shutting down the sulfur recovery process. The specially designed ball valve offers high sealing performance and easy operability.

Operating costs

No consumables or reagents required. Except for zero-point gas Low utility consumption Low power consumption, low steam consumption Pulsed xenon lamp light sources have a long service life. On average, replace it every five years. All-solid-state device No moving parts, with a longer lifespan than similar products.

Compatibility

Explosion-proof certificate for hazardous areas Class I Div 1 & 2; ATEX; GOST, etc. No need to analyze the hut or sunshade. Can be directly installed outdoors.

Application areas

Liquid sulfur pool

The sulfur recovery unit (SRU) is designed to remove hydrogen sulfide (H₂S) from the incoming acid gas. ₂ S) and other sulfur-containing compounds, converting them into elemental sulfur. The Claus process is the most commonly used method in SRUs. In the Claus process, the elemental sulfur removed is condensed and then fed into a liquid sulfur pond. The liquid elemental sulfur produced in this process may contain up to 300 ppmw of dissolved H. ₂ S.

As time goes by, the dissolved H ₂ S will escape into the gas phase space of the liquid sulfur pool, establishing an equilibrium between the gas and liquid phases. The H accumulated in the liquid sulfur pool... ₂ S must be monitored. H ₂ The lower explosive limit of S is 4% by volume concentration, and it may ignite upon contact with mechanical equipment such as pumps or compressors.

Technical concept

Operating principle

TLG-837 uses the UV-visible principle to detect chemical components in sulfur tail gas. The system acquires high-resolution spectra in the 200-nanometer to 800-nanometer wavelength range, within which H ₂ S, SO ₂ COS and CS ₂ All exhibit unique and distinct absorbance curves.

Optical structure

The TLG-837 uses a long-life xenon lamp as a light source to emit an optical signal, which comes into contact with the sample via a flow cell plate. This signal is emitted by the light source and transmitted through an optical fiber cable to the top of the probe’s flow cell plate, where it interacts with the sample gas. The sample, composed of various chemical substances, exhibits unique absorption characteristics for light. The resulting optical signal then exits the flow cell, travels back to the detector via the optical fiber cable.

Gas Absorbance Spectrum of Liquid Sulfur Pool

To monitor the gas concentration in the liquid sulfur pool, the TLG-837 analyzer detects the unique absorbance curves of each chemical substance and uses an algorithm to distinguish the spectrum of the substance being measured from the overall sample spectrum. According to Beer-Lambert’s law, the TLG-837 analyzer can directly correlate the height of each spectral curve with the real-time concentration of the corresponding sample component.

User interface

AAI’s proprietary ECLIPSE software processes the acquired spectral data into actual concentration readings. On the touchscreen controller, the analyzer operator can easily switch between different interfaces—such as trend graphs, spectra plots, concentration readings, and more—and can independently and at any time set and adjust alarms, outputs, purge functions, zeroing, and other parameters.

Multi-component measurement

TLG-837 Continuous Monitoring H ₂ S and SO ₂ The concentration is determined by using a mathematical algorithm to distinguish between different absorbance curves. This method is far more advanced than traditional optical filter wheels—it has no moving parts, no filters, and therefore avoids cross-interference.

In-situ sampling

TLG-837 uses AAI’s patented in-situ fog-control probe to sample sulfur tail gas.

Fog-control probe

The fog-control sampling probe is designed with a lightweight, compact structure, allowing it to be installed by just one worker. The probe is directly mounted onto the sample pipeline via a flange.

The portion of the sample gas that actually comes into contact with the optical signal is located inside the sample-flow cell disc at the tip of the probe. The optical signal enters the interior through one end of the flow cell disc, where it contacts the sample gas, and then exits through the other end.

Automatic desulfurization

Sulfur-containing tail gas contains elemental sulfur, which readily condenses, clogs pipelines, and blocks the passage of optical signals. As the sample gas rises through the probe and enters the flow cell plate, the mist-control probe removes the elemental sulfur, preventing it from obstructing the flow cell plate. The probe utilizes the steam generated by the Claus reaction to regulate its internal temperature, ensuring that at this temperature, the elemental sulfur condenses into droplets and is then returned to the sample pipeline.

Inside the probe, a mist-control pipe is concentrically arranged with the probe itself. Low-pressure steam continuously flows through this mist-control pipe. Since the temperature of the low-pressure steam is significantly lower than that of the sulfur tail gas, the low-pressure steam effectively cools the rising tail gas. Among the various gases in the sulfur tail gas, sulfur itself has the lowest boiling point. Thanks to the cooling effect of the low-pressure steam, elemental sulfur in all the rising gases is efficiently condensed, allowing all other gaseous components to continue rising toward the top of the probe.

The point of contact between the sample gas and the optical signal is located inside the flow cell disc at the top of the probe. The flow cell disc contains a channel through which high-pressure steam flows. The purpose of the high-pressure steam is to heat the flow cell disc, ensuring that any elemental sulfur that has not been condensed in previous steps remains in the gaseous state. This eliminates the risk of elemental sulfur condensing within the flow cell disc.

The ejector creates a Venturi effect, drawing the sample gas into the probe, where it rises to the interior of the flow cell for analysis and then returns to the sample line.

Practical Control Panel

The UCP practical control panel can stabilize the pressure and regulate the flow of high-pressure and low-pressure steam, instrument air, calibration gas, and nitrogen entering the probe. The UCP is an optional accessory; we recommend that customers use the配套 practical control panel provided by AAI. Users are also free to manufacture this control panel themselves.

Ultra-safe design

The primary drawback of all other tailgas ratio analyzers is that they introduce the sample into the analyzer’s interior for measurement. This design not only makes the electrical components inside the enclosure more susceptible to corrosion but also poses a potentially lethal threat to personnel: Should a leak occur inside the analyzer—especially in a sealed cabinet or small enclosure—operators could face a life-threatening danger.

The biggest difference between the TLG-837 and other exhaust gas ratio analyzers is that we use optical fibers: We introduce light into the sample, rather than introducing the sample into the light. The toxic and hazardous sample gas flows only within the probe itself and never enters the analyzer’s housing, which contains electrical components.

Technical Parameters

The following technical specifications are based on the premise that all components and the sample system are supplied by AAI, and that the system installation has been approved by AAI. For technical specifications under other conditions, please consult AAI’s sales team directly.

General

Operating environment
Measurement principle	Ultraviolet-Visible Spectrophotometry Principle
Detector	nova II™ UV-Vis Diode Array Meter
Spectral detection range	200–800 nm
Light source	Pulsed xenon lamp light source (average service life of five years)
Signal transmission	600 μm core, 1.8-meter optical cable; other lengths available upon request.
Sampling method	In-situ Fog-Control Probe
Analyzer calibration	Before leaving the factory, the instrument is calibrated using a standard gas certified by the manufacturer; users do not need to recalibrate it again. The system’s accuracy is ensured by an automatic zeroing function.
Reading verification	Simple verification using standard samples
Controller	Industrial controller equipped with an LCD touch screen and ECLIPSE™ operating software.
Data storage	Pure solid-state drive
Analyzer environmental conditions	Suitable for both indoor and outdoor use; no analysis cabin required.
Ambient temperature	Standard: 0 - 35 °C (32 - 95 °F) Optional: -20 to 55 °C (-4 to 131 °F) To avoid thermal radiation, it is recommended to install the analyzer under a sunshade in environments with direct sunlight.
Utility Equipment Requirements
Electricity	85 - 264 VAC 47 - 63 Hz
Power consumption	65 watts
Instrument air	70 psig (-40 °C dew point)
Steam pressure	Fog-control pipeline: 70 psig Automatic back-blow: 30-50 psig
Output
Standard output	1x galvanically isolated 4-20mA analog output per measured analyte 5x digital relay outputs for indication and control 1x K-type ungrounded thermocouple input
Optional output	Modbus TCP/IP; RS-232; RS-485; Fieldbus; Profibus; HART
Size specifications
Material in contact with the sample gas	316/316L stainless steel, perfluoroelastomer, other materials available upon request
Analyzer chassis material	Wall-mounted NEMA 4X304 stainless steel enclosure; other enclosures available.
Probe material	316/316L stainless steel; other materials available upon request.
System size	Analyzer: 24 inches high x 20 inches wide x 8 inches deep (610mm H x 508mm W x 203mm D) Probe: 36 inches long x 12 inches maximum diameter (914 mm x 305 mm)
System weight	Analyzer: 32 pounds (15 kilograms) Probe (average): 29 pounds (13 kilograms)

Performance

Measurement parameters
Accuracy/Repeatability	matter	Scope	Accuracy	Repetitiveness
	H ₂ S	0-2%	± 1% of full scale	± 0.4%
	SO ₂	0-2%	± 1% of full scale	± 0.4%
Ratio range	100:1 < H ₂ S:SO ₂ < 20:1
Response time	1-5 seconds
Zero-drift	After a 1-hour warm-up, the accuracy is ±0.1% of full scale and remains stable for 24 hours under constant ambient temperature.
Sensitivity	±0.1% of full scale
Noise	±0.004 AU at 220 nm