FUNC Function
Due to the development of production and technology, especially the development of coal, petroleum and chemical industries, the demand for flammable and explosive environment monitoring is becoming more and more urgent. At first, the explosion-proof CCTV system was proposed and applied in Russia, France, Poland and other countries, and later developed and applied in the United States. In the early 1990s, China YANGZI petrochemical introduced a set of explosion-proof CCTV system from the United States. These systems have established a preliminary foundation for the research and development of explosion-proof CCTV systems and triggered a development and application boom in the future. In 1988, Chang Zhou YUHUA electric appliance factory undertook the research and development task of “Seventh Five-Year Plan of China” of the national key project –the coal mine explosion-proof CCTV system, which was completed in 1992 and obtained the product explosion-proof certificate, MA license and project qualification certificate, began to put on the market, and achieved good results. Since then, other units have also begun the research and development work in this area, and achieved varying degrees of progress. With the expansion of the demand side and the deepening of the research work, the explosion-proof CCTV system has reached a considerable technical level and has begun to take shape. Meanwhile, it has also filled up the blank of anti-corrosion CCTV system, high-temperature resistance CCTV system and some special function CCTV system, forming a preliminary series of products. The application environment of the CCTV system is very extensive. The application of the explosion-proof CCTV system in the flammable and explosive environment is still in its infancy. The special function CCTV system for special environment applications has yet to be developed. It can be predicted that the application prospect of the CCTV system, especially the explosion-proof CCTV system and the special function CCTV system is very broad.
Explosive atmospheres may be formed in places involving the production, processing, treatment, storage and transportation of explosive materials.
◆Explosive Atmosphere: Explosive atmosphere is an environment in which an explosion may occur (gas and dust).
◆Hazardous area: The hazardous area is an area in which an explosive atmosphere may be expected to be present at such frequencies as to require special precaution for the structure, installation, and use of electrical equipment.
◆In the petroleum, chemical, coal and other production areas, the explosive material will be released inevitably and form explosive hazardous area with the air. According to the data:
- Underground coal mine, 2/3 of the areas are explosive hazardous area.
- About 60-80% of oil field and refineries are explosive hazardous area.
- In the chemical industry, more than 80% of the production workshop is explosive hazardous area.
The explosive substances are divided into three groups in China:
Group I: firedamp in mines.
Group II: an explosive atmosphere caused by a mixture air and gases (containing vapours and mists) other than mines susceptible to firedamp.
Group III: an explosive dust and fibers atmosphere.
Explosive gas hazardous area is divided into 3 zones, i.e., zone 0, zone 1 and zone 2, just like the IEC standard. Their corresponding definitions are as follows:
Zone 0: The zone 0 is an area in which an explosive atmosphere caused by a mixture of air and gases is presented continuously or for long periods in normal operation. (1000h/y and above)
Zone 1: The zone 1 is an area in which an explosive atmosphere caused by a mixture of air and gases is expected to occur occasionally in normal operation (10 ~ 1000h/y)
Zone 2: The zone 2 is an area in which an explosive atmosphere caused by a mixture of air and gases is unlikely to occur in normal operation and if it occurs it will be for a short time and then only rarely. (10h/y below)
Safe area: less than 1h/y.
Explosive dust hazardous area is divided into 3 zones, i.e., zone 20, zone 21 and zone 22, just like the IEC standard. Their corresponding definitions are as follows:
Zone 20: The zone 20 is an area or the interior in container in which a cloud of combustible dust is present continuously or frequently during normal operation in sufficient quantities to form a mixture of combustible dust and air and/or may form uncontrollable and extremely thick layers of dust.
Zone 21: The zone 21 is an area in which a cloud of combustible dust is present in sufficient quantities to form a mixture of combustible dust and air during normal working operations but not included in zone 20. The area includes a location directly adjacent to where the dust is filled or discharged, a location in which a dust layer occur and a location in which a mixture of combustible dust and air that reaches combustible concentration may occur under normal operating conditions.
Zone 22: The zone 22 is an area in which under abnormal condition, a cloud of combustible dust occurs occasionally and is only present for a short period of time, or in which the combustible dust occasionally accumulates or the dust layer may exist that produces a mixture of combustible dust and air. If it is not guaranteed to exclude the occurring of the combustible dust accumulation or the dust layer, the area should be divided into zone 21.
1. It can realize explosive gas atmospheres monitoring system, explosive dust atmospheres monitoring system and other monitoring systems.
2. Supporting devices complying with explosion-proof requirements, such as explosion-proof junction equipments, explosion-proof cable glands, explosion-proof flexible pipes or explosion-proof armored cables;
3. It can be equipped with infrared light lamp, white light lamp, wiper and stainless steel enclosure to meet the requirements;
4. Receive the digital video streams of cameras through the network, and store and manage it. The multiple network cameras can be watched, browsed, played back, managed and stored at the same time.
5. The recording files can be backed up locally through the mobile storage device. The video image of the local camera system can remotely view, control and download through wired devices (such as optical cable, etc.) or wireless devices (such as wifi, 4G, etc.). Different user levels can be set remotely through wired devices (such as optical cable, etc.) or wireless devices (such as WIFI, 4G, etc.).
6. Single screen switching, multi-screen switching, zoom±, Pan/Tilt, wiper on/off , light on/off and other operations can be realized.
FFB Characteristic
1. It is widely installed in the coal conveying belt tunnel, silo, oil platform, power plant and other inflammable and explosive environments;
2. The camera system can be equipped with white light or infrared light to ensure high quality image effects under low illumination conditions.
3. Our company has a rich and standardized explosion-proof wiring and grounding process;
4. The enclosures of camera system is suitable for environment with high pollution and high strength vibration. In order to cope with the dusty environment on site, the camera system can be equipped with a wiper device, which ensures the cleaning of the window glass.
5. The operator in operator’s cab can control the front-end camera by zooming, wiper, lighting, etc. through the control panel.
6. In order to ensure the safety of the CCTV equipments of port machinery, all camera systems are equipped with safety chains (anti-dropping).