On April 1st, 2024, at 13:00, a sudden fire broke out at a chemical factory located in Songjiang District, Shanghai. The blaze burned for several hours, with fierce flames and dense black smoke filling the scene. Fortunately, there were no casualties reported.

At around 3 pm on that day, a witness who happened to pass by the scene nearby told Xiangxiao Morning Post that the factory on fire was a rubber factory, and the flames were quite large at the time. Xinmin Evening News also reported that according to nearby residents, when the fire broke out, a large amount of smoke emerged from above the unit on fire, and the fire was fierce. After the incident, personnel on the scene quickly dialed the emergency number to report the fire.

In recent years, accidents in chemical enterprises have occurred frequently. With the approach of the Qingming Festival and the May Day holiday, the main responsible persons, safety management personnel, and operators of these enterprises are likely to return home for family visits, ancestor worship, and travel. This often leads to a reduction in on-site personnel, relaxed mindset among employees, lax daily management, and increased risks to safety production. As chemical enterprises enter the peak season of production and operation, equipment and facilities operate at high loads with concentrated personnel in workshops and factories. In the event of an accident, it can easily lead to serious consequences such as mass casualties. Therefore, more attention should be paid to gas detection in safety production.

However, in past detection standards, there was no clear concept of gas spillage protection for regional boundaries, nor were there effective detection methods established. Basically, the approach was to indirectly achieve the goal of preventing risk spillage by simply increasing the number of fixed-point detectors and thereby enhancing the probability of detecting leaks. The existence of this phenomenon was mainly limited by the technical principles and application level of traditional point-based detectors, which can only function within a very small detection area of several square meters and determine the occurrence of leaks through catalytic combustion or chemical reactions that take 30-60 seconds. This is not effective for online detection of device boundaries with side lengths of hundreds or even several hundred meters.

The fixed reflective laser gas telemetry and fixed scanning laser gas telemetry from Hanhai Optoelectronics are suitable for real-time monitoring of gas leaks during chemical plant construction and processing.

By installing fixed reflective laser gas telemetry and fixed scanning laser gas telemetry at the boundaries of equipment, tank areas, compressors, and other locations, effective detection of dangerous gas leaks and spills can be achieved. Due to their wide detection range, long detection distance, and fast response time, these telemetry devices offer broader detection coverage, increased safety, simpler design and construction, and cost savings compared to the conventional setup of multiple fixed-point detectors.

Fixed Reflective Laser Gas Telemetry

Hanhai Optoelectronics' fixed reflective laser gas telemetry features integrated transceiver capabilities with a detection range of up to 1 kilometer. It boasts a response time of only 1 second, enabling precise detection of trace leaks at the ppm level. This telemetry truly achieves preventive monitoring of gas leaks. Compared to traditional detectors, which are susceptible to interference from environmental factors and cross-gases, it exhibits strong anti-interference capabilities. With fingerprint-based detection, it ensures zero false alarms. The product requires no calibration, saving operational costs throughout its lifecycle. It can detect various gases including methane, ethylene, acetylene, carbon monoxide, carbon dioxide, hydrogen sulfide, ammonia, and more.

Fixed Scanning Laser Gas Telemetry

The telemetry instrument integrates laser control, spectral acquisition, and spectral analysis. It projects a laser beam onto a distant object under surveillance, and the reflected beam returns to the telemetry instrument. The telemetry instrument then analyzes the returned signal to obtain gas concentration data. By rotating the telemetry instrument in both horizontal and vertical directions, it scans to create a 360° three-dimensional detection area similar to a radar, enabling coverage and monitoring of a large spatial area with a detection radius of up to 300 meters. The detection data is combined with video images, allowing management personnel to "see" the current detection situation, including the location being monitored and gas concentration information. Leaks can be discovered and their locations pinpointed through scanning. Multiple scanning modes can be set, allowing flexible configuration of scanning and detection paths. The instrument operates fully automatically, eliminating the need for manual operation. It can perform real-time online monitoring of gases such as methane, ethylene, acetylene, and ammonia.