The kitchen is the most smoky place in the home, but it is also a place where hidden dangers, and the biggest source of danger is gas. Gas may be extinguished by the soup that overflows during cooking, it may be blown out by the wind too close to the window, and there may be problems such as gas hoses falling off and rupturing, forgetting to close the gas valve, etc., which can cause gas leakage and cause carbon monoxide poisoning, explosion, fire and other accidents.
Generally speaking, three conditions need to be met at the same time for gas to ignite and explode: First, the gas is in the explosion concentration range. Taking natural gas as an example, its main component is methane, and the explosion concentration range is 5%~15% (the proportion of natural gas concentration in the air); Second, confined space. In the event of a gas leak, if the doors and windows are closed, the ventilation device is missing or not opened, it is easy to form a closed environment, resulting in gas accumulation; Third, there is an ignition source. Not only smoking, turning on a gas stove, but also touch switches, static electricity on clothes, making and receiving phone calls, etc., can cause sparks and explosions.
The gas itself is colorless and odorless, in order to make people aware of the gas leakage, the gas company will add the odorant tetrahydrothiophene to the natural gas when supplying the gas, when the user smells the pungent odor, it means that the leak has occurred, and measures should be taken quickly, but this is far from enough. Some people turn on the lights as soon as they get home, or when they open the door and smell the stench, they subconsciously turn on the lights to check, or quickly call for help, all of which can cause an explosion instantly. There are also young children and elderly people with limited mobility, and it is also difficult to respond correctly in the event of an emergency such as a gas leak.
In this context, people need to use more advanced early warning and alarm methods represented by gas alarms to eliminate gas safety hazards. The gas alarm can send out an alarm signal to remind the user to take safety measures before detecting that the gas concentration reaches the critical point of explosion, which can be described as a rigid device to protect gas safety.
The mainland attaches great importance to gas safety construction, and has issued a series of relevant policy documents, such as the Work Safety Law revised in 2021, the Gas Engineering Project Specification issued in 2021, and the National Urban Gas Safety Special Rectification Work Plan issued in August 2023.
At the national level, the mainland has made mandatory provisions for the installation of gas alarms by industrial and commercial catering users, and those who do not install or affect their normal work will face penalties; For domestic gas users in high-rise buildings (more than 100 meters), it is also stipulated that "gas leakage alarm devices shall be installed, and emergency automatic shut-off devices shall be installed at the gas inlet pipes".
At the local level, in order to better protect the gas safety of residential users, more and more provinces and cities have introduced relevant policies and measures to increase the promotion and installation of household gas alarms. Shandong Province stipulates in the "Shandong Provincial Gas Management Regulations" that "if a residential building uses piped gas, a gas leakage alarm shut-off device shall be installed, and the installation, maintenance and renewal costs shall be included in the gas distribution cost of the gas business enterprise." Henan Province clearly stated in the "2023 Henan Provincial Key People's Livelihood Practical Work Plan": "Implement the installation of gas safety devices for residential users, and complete the installation of gas user safety devices for 10 million households throughout the year." "Shenyang has completed the installation of gas alarms for resident/non-residential gas users throughout the city. Lanzhou City has installed alarms, self-closing valves and metal hoses for urban natural gas residential users in Chengguan District, Qilihe District, Anning District, Xigu District, Yuzhong County, Gaolan County and Yongdeng County free of charge. Changji City, Xinjiang, has installed free civil gas leakage alarms for about 118,000 households in the city's old residential areas. Chengdu Jinniu District installed gas alarms for 2,586 empty-nest elderly people living alone free of charge. Hangzhou has provided free gas alarms to 6,529 elderly households living alone in the city. A total of 110,000 elderly households living alone in Shanghai have been equipped with gas alarms.
There are interference factors such as oil smoke, water vapor, cooking wine (ethanol), vinegar (acetic acid), dust, high temperature and other interference factors in the kitchen, and traditional household gas alarm products often have false alarms and false negatives, which will not only make the user experience extremely poor, but also bring trouble to the gas safety supervision department.
It is reported that Hanwei Technology Group, a well-known sensor leader and intelligent instrument manufacturer in China, launched the JT-KWA/KWD series laser household combustible gas detector, using advanced tunable semiconductor laser absorption spectroscopy technology (TDLAS), realizing the independent and controllable whole industrial chain from the core laser to the sensor module and then to the detector machine, creating a precedent for the use of laser technology to detect household gas leakage in China, and leading the industry in comprehensive performance. In March this year, as a member of the "Henan Science and Technology Specialty Gift Package", the product appeared at the scene of the National Two Sessions and attracted much attention.
Extremely anti-interference, made for methane. This series of new products adopts TDLAS technology, built-in 1653nm laser, only reacts to methane gas, has strong anti-interference ability, and solves the problem of false alarms and false negatives from the technical principle. TEC two-way temperature control, more accurate detection. The product adopts TEC bidirectional temperature control technology, which can accurately control the laser working temperature to ensure the stable operation of the laser and promote more reliable wavelength locking. Maintenance-free and calibration-free, with a service life of up to 10 years. The core component of the product, the laser sensor, is physical in detecting methane, with good long-term consistency, no performance degradation, no maintenance, calibration, more convenient to use, and a life span of up to 10 years. The piano key grille design is beautiful and practical. The product adopts a piano key grille design and is lined with a filter layer, which can prevent dust and dirt while allowing gas to enter the air chamber freely, which is both beautiful and practical. Networked multiple alarms to eliminate potential safety hazards. In the event of a gas leak, the product will notify the user to respond in a timely manner through phone calls, text messages, and platforms, and can be linked with shut-off valves and other devices to automatically close the gas valve and strangle the danger in the cradle.
Gas leakage and explosion accidents are small probability events, but often small probability events often cause large accidents. According to data, the penetration rate of household gas alarms in developed countries has reached more than 85%, and the installation penetration rate of household gas alarms in Japan is close to 100%. The penetration rate of gas alarms in the mainland is about 10%, and there is still a lot of room for development.
In recent years, the construction of gas safety in mainland China has pressed the acceleration button, in this process, Hanwei Technology Group will give full play to its own advantages, protect household gas safety with hard-core products, and help the safety construction of all links of the mainland gas industry chain with one-stop gas safety solutions.