Environmental protection and sustainable development have become a global consensus, unclean and heavily polluting industries are gradually being shut down, under this background, clean and renewable wind power generation is rapidly emerging, behind the rapid development of this industry, safety has become and important issue that plagues and hinders the development of this new energy industry.
Recent years, in the safety accidents of wind turbine operation, the proportion of fire accidents is very large, often cause the entire wind turbines to be completely burned, cause huge economic loss.
with the cumulative increase of wind turbine operating time individual system components are gradually worn out and aged, the failure rate will continue to rise, and fire risk will also increase significantly.
Since the year of 2008, there have been more than 40 devastating fire accidents of wind turbine units reported by the media in China, causing a direct economic loss of 500 million yuan, and causing 10 deaths; Sweden makes statistical analysis on the annual operation accidents of 1487 sets of wind turbine engines units, there are 86 lighting accidents, with an annual failure rate of 5.8%; the control system has 3 times, and its annual failure rate is 2.6%; the power system has 25 times, with annual failure rate of 1.7%; the lighting accidents, control system accidents and electrical equipment accidents often lead to fires.
The features of wind turbine fire are as following:
There are many kinds of combustibles used in wind turbine generator rooms, including: kinds of lubricating oil, hydraulic oil, high-pressure hose, ventilation duct, electrical components, wires and cables, paint, sealing materials, thermal insulation and sound-absorbing cotton, nacelle, blade materials etc.
These combustibles are distributed in different parts of the impeller, engine room and tower, and the type and quantity of combustible materials in the nacelle engine room cover are the most, there are also many machines and equipment, dense distribution, the space is narrow, and the fire risk is the highest.
There have been below 9 points:
Total flooding protection for wind turbine engine room: The wind power engine room is an unattended space, because there are many mechanical and electrical equipment, complex structure; the machine operates continuously for a long time, there are many scattered hot spots, therefore, full flooding protection is adopted.
Equip with Minisol brand aerosol fire extinguishers according to the internal volume space, heat detector, smoke detector, thermal activation device, horn&strobe, gas releasing indicator, fire alarm, isolation switch etc; and feedback the working and fire extinguishing status through the gas fire extinguisher controller; when a fire occurs, the fire suppression units will release a lot of aerosol gas, completely submerge the whole wind turbine space, to suppress fire.
There are many facilities in the engine room, there may be obstacles, therefore, we must use aerosol system as total flooding protection solution; aerosol extinguishing gs can cover all corners of the engine room, it can effectively control the fire, aerosol gas forms a long-term immersion in the engine room, effectively reduce the overall temperature of the engine room and prevent secondary fire.
The relevant electrical cabinets in the wind turbine engine room and tower foundation are unattended space, due to the long-term uninterrupted operation of internal electrical equipment, there is potential electrical fire hazard, therefore, local protection in the cabinet is adopted; in this way, the sudden initial fire can be put out in time.
So we suggest to install the temperature sensing thermal cord type aerosol fire extinguishing device, according to the internal space volume, equip with optional mechanical temperature sensing device, which can also be connected to the gas fire extinguishing controller to extinguish the fire.
The system can be started by temperature sensing without electricity.
Wind turbine smart fire management system is normally made up of on-site monitoring equipment, fire detection device, fire suppression units, fire alarm control panel, data network, and control platform etc.
It is intelligent management for sudden fire in wind turbines, realize the function of initial fire detection, intelligent analysis, early intervention control, automatic and efficient fire extinguishing in case of fire emergency, real time network transmission of fire data, early remote intervention control.
It has the characteristics of multi-sensor compound detection, full cycle fire detection, fire monitoring, analysis and early warning, emergency fire fighting, remote dynamic management etc.
In all, aerosol suppression system and its accessories are the ideal solution for wind turbines in new energy industry.
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