At about 9:00 on May 17, 2022, a deflagration occurred in the new regulating tank of Fuzhou Hongmiaoling leachate plant.

According to the office of the people's Government of Jin'an District, Fuzhou, at about 9:00 on May 17, a deflagration occurred in the new regulating tank of Fuzhou Hongmiaoling leachate plant, leaving six people trapped.

By 12:40 on the 18th, the rescue work had been basically completed. Six people were rescued on the scene, three of whom had been sent to hospital for treatment. At present, their vital signs were stable, and the other three had no vital signs when rescued. The investigation of the cause of the accident and the related aftermath work are being promoted.

At present, the official has not announced the cause of the accident.

Previously, similar accidents had occurred in other areas due to "methane explosion in leachate regulating tank".

With the end of large-scale construction of environmental infrastructure, environmental protection facilities are changing from "heavy construction" to "heavy operation".

In the era of "focusing on operation", the safety of environmental protection facilities has been put on the agenda. Recently, the frequent environmental protection and safety accidents in various places have also reminded the majority of environmental protection enterprises. Please attach great importance to and be vigilant.

In the future, safety will also become a new threshold for competition in the environmental protection market. If the safety management ability fails to meet the requirements, enterprises will also be eliminated by the market.

How to prevent explosion of sewage treatment

Sewage treatment system is a universal and indispensable non production facility in industrial enterprises. It discharges or recycles the waste water discharged from the production process of the enterprise after sewage purification treatment and reaches the national sewage discharge standard. Because the waste water contains flammable and explosive liquids and gases, solid substances form explosive gas mixture, which has great fire risk. If the fire safety management is ignored and the preventive measures are not in place, explosion will occur once various ignition sources are encountered. Therefore, the sewage treatment system and fire prevention work should be highly valued by the leaders of relevant departments and enterprises.

Hazard of sewage treatment system

1. Presence of explosive gas mixture

Soluble and combustible gases often exist in the sewage discharged by chemical enterprises. Under certain circumstances, these gases and liquids are easy to form explosive mixtures, which are manifested in several aspects: first, if the equipment system is damaged or overflowed due to violation of operation, flammable and explosive gases are easy to enter the sewage, which brings adverse reactions to the safety production of the system. Second, after the high-temperature steam and sewage enter the sewer, the sewage temperature will rise, and the vaporized flammable liquid may cause an explosion. Third, in the process of gas absorption and desorption, if flammable liquid or flammable gas is encountered, these gases will be resolved when the temperature rises. At this time, flammable liquid will continuously overflow from the outlet.

2. Hazardous substances will be generated

Various substances discharged into the sewer will react with each other, which is likely to produce flammable, explosive and even spontaneous combustion substances.

3. Fire spread

Sewage pipelines are all over the enterprise area, and the explosion or fire often spreads along the sewage treatment system. If it is not stopped in time, it is likely to cause chain damage.

4. Ignition source

There are various ignition sources in sewage treatment sources, including mechanical expansion, friction sparks, welding sparks, lighted cigarette butts, and sparks in vehicle exhaust pipes.

How to detect the danger brought by sewage as soon as possible? Hanhai optoelectronics brings solutions.

Fixed reflection laser gas telemeter

In cooperation with the Chinese Academy of Sciences, Hanhai optoelectronics has undertaken the industrialization of laser absorption spectrum gas detection technology, a major national special scientific research achievement. The self-developed fixed reflection laser gas telemeter can detect methane, carbon monoxide, hydrogen sulfide, ethylene, acetylene, ammonia and other gases. And through the networking of multiple devices, the real-time monitoring of the distribution concentration, moving speed and moving direction of different component gases can be realized.

The sewage treatment system of environmental protection enterprises covers a wide range of areas. At the same time, there are many flammable, toxic and harmful gases, and many gases are mixed. In view of such characteristics, Hanhai photoelectric fixed reflection laser gas telemetry instrument has the following characteristics to enhance the detection of large-scale and multi gas.

01. Wide detection area

The fixed reflection laser gas telemeter can detect methane at a distance of 1km, and can detect ethylene, acetylene, hydrogen sulfide and other gases at a distance of 200m.

02. Preventive monitoring

Different from the passive waiting of traditional detection mode, it actively monitors the leakage risk points. The response time is only 1 second, which can accurately detect ppm level micro leakage. Truly realize the preventive monitoring of gas leakage.

03. Convenient installation

The laser transmitting end and receiving end are integrated at one end, and the other end is only equipped with a reflecting device, which is convenient to install.

04. Strong anti-interference ability

Compared with traditional detectors, which are easily disturbed by environment, cross gas and other factors, the anti-interference ability is strong. Fingerprint detection, truly achieve zero false alarm.

05. Accurate measurement

The leakage gas concentration is quickly obtained by spectral inversion algorithm, and the sensitivity is up to 1ppm m. Completely eliminate the phenomenon of false positive and false negative.

06. "0" maintenance

The product does not need to be adjusted, which can save operation in the whole life cyclcost.

07. Long service life

The service life of the product is up to 20 years.

08. Detection of gas diversification

Gas detection type: methane, carbon monoxide, hydrogen sulfide, and ethylene

Alkene, acetylene and ammonia (more gas detection schemes can be provided according to customer needs)