I. Prospect of lithium battery energy storage container fire extinguishing system:
In order to meet the normal operation requirements of power plant equipment, user equipment and power system, the power system has set frequency control requirements. Energy storage systems used in power systems need to have both power density and energy density. The frequency regulation of traditional power systems is provided by conventional generating units such as thermal power and hydropower. With the advent of energy storage technology, more and more electrochemical energy storage battery (mainly lithium batteries) systems have begun to provide services for power systems in recent years. Lithium battery energy storage systems can well avoid the disadvantages of traditional generator sets such as adjustment delays, reverse adjustments, and large adjustment deviations, and can quickly and accurately respond to the frequency regulation instructions of the power grid. Therefore, lithium battery energy storage systems are widely used in the market.
Lithium battery energy storage systems are mainly used in telecommunication, communication, solar energy storage batteries, UPS uninterruptible power supplies, nuclear power stations, hydropower stations, wind power storage, mobile communication base stations and other energy storage power stations that need continuous power supply and meet special needs. Lithium battery energy storage containers are mainly a mobile energy storage container power station. Currently, outdoor installation methods are mainly used as auxiliary production equipment for power plants or substations to meet the needs of rapid deployment.
Fire characteristics of lithium battery energy storage containers:
The dangers of lithium battery energy storage containers mainly include the fire danger of lithium batteries and the fire danger of electrical equipment.
1. Fire danger of lithium battery:
Lithium battery fires are mainly the result of electrolyte decomposition and combustion, and are a kind of hydrocarbon gas fire. In the case of battery overheating, excessive charge and discharge, short circuit caused by defects in battery design and raw material defects, chemical reactions occur between the battery materials inside the lithium battery, and the electrolyte decomposes to generate a large amount of heat and gas, leading to the battery's thermal runaway. The thermal runaway that releases energy quickly is the main reason for the electrolyte to burn. Once the thermal runaway occurs, the battery temperature rises rapidly, which directly causes the battery material to burn. When the concentration of flammable gas produced by the decomposition and combustion of the electrolyte of a lithium battery reaches a certain level, it will explode in the presence of an open flame. In large-scale lithium battery energy storage containers, the battery pack has the characteristics of high density and centralized distribution. The lithium battery module forms a single battery pack in series, and multiple battery packs form a large-capacity energy storage unit in parallel. This not only increases the probability of failure of the lithium battery, but also in the event of a fire, it will also increase the spread of fire because the circuit cannot be cut between the batteries.
2. Fire danger of electrical equipment:
There are a large number of auxiliary electrical equipment in the lithium battery energy storage container. The unsafe use of these devices also increases the overall fire risk of the energy storage container, such as accidental high voltage and high current (lightning, surge) intrusion. The high-voltage and high-current invasion of the lithium battery energy storage container is on the one hand the highly integrated electronic equipment in the lithium battery energy storage container, which reduces its resistance to high voltage and high current; on the other hand, the system uses A large number of communication lines increase the channels for high voltage and high current intrusion. At the same time, the failure of protective components is also an important cause of fire. Long-term heating and over-temperature caused oxidation and corrosion of some electrical components in the cabinet, aging of some insulation materials, over-current protection in the battery, DC fuses and over-current fuses in the battery failed to effectively isolate short-circuit faults, and could not meet its original design resistance and insulation Requirements, as a result, the lithium battery energy storage container system as a whole has a greater hidden danger in electrical safety, and at the same time, it will cause the fire to spread and expand.
Generally, a large amount of gas is generated when a lithium battery is burned, mainly composed of organic gases such as hydrogen, carbon monoxide, carbon dioxide, methane, benzene and toluene, and toxic gases such as hydrogen chloride and hydrogen fluoride. In the event of a fire, flammable gases such as hydrogen and carbon monoxide released by the lithium battery inside the lithium battery energy storage container under high temperature conditions cannot be effectively controlled, which can easily cause the fire to spread rapidly and even explode, endangering the main electrical equipment and causing huge property. loss.
Setting up a lithium battery energy storage container fire extinguishing system
From the above, safety is a key consideration for lithium battery energy storage container manufacturers. The solution of Nianhai Fire Protection's lithium battery energy storage container fire extinguishing system mainly discusses the fire methods and measures of lithium battery energy storage container from the aspects of gas automatic fire extinguishing system and fire safety management.
1. Lithium battery energy storage container gas automatic fire extinguishing system configuration:
According to the "Code for Design of Gas Fire Extinguishing System" (GB 50370-2005), the lithium battery energy storage container fire extinguishing system uses a non-conductive portable, cabinet or pipe network sevoflurane gas fire extinguishing system, and a nitrogen fire extinguishing system is also arranged at the same time. Lithium battery energy storage container fire extinguishing system consists of heptafluoropropane fire extinguishing device, pressure relief device, gas fire extinguishing controller, fire detector and controller, emergency start stop button and isolation module, smoke detector, sound and light alarm, and gas release indicator And other components to achieve automatic detection, alarm, fire protection protection function.
Each container in the container-type lithium battery energy storage system is an alarm area, and point-type smoke detectors are added. When the smoke and temperature changes are detected, the sound and light alarm will immediately respond, and the fire will be extinguished in the early stage of the fire. Ensure the safety of energy storage containers. At the same time, considering the processing method of the collected signals, the number of sound and light alarms should be increased, and they should be arranged in places where personnel are often patrolled and on duty. When the smoke and temperature changes are sensed, the sound and light alarm will immediately respond, extinguish the fire in the early stage of the fire, and ensure the safety of the energy storage container.
At the same time, considering that the lithium battery energy storage container is liable to explode, according to the characteristics of different lithium batteries, a targeted explosion-proof system is configured. The gas fire extinguishing controller is linked to the fan, power supply, etc. Transfer to fire control center.
2. Features of lithium battery energy storage container fire extinguishing system:
The lithium battery energy storage container fire extinguishing system has automatic advance, automatic monitoring, and automatic fire extinguishing functions. The system has a high degree of integration and good results. A systematic analysis may be performed to meet the needs of different customers. The spraying duration of the heptafluoropropane fire extinguishing system is 10s. After the spraying is completed, the lithium battery energy storage container is kept in a sealed state for 10 minutes, so that the fire extinguishing agent is fully diffused and extinguished.
Strengthening fire safety management
1. Nianhai Firefighting formulated a special lithium battery energy storage container fire extinguishing system training program and user manual, and carried out multiple trainings and on-site simulation operations for the users to solve the problems in the user's use in a timely manner.
2. The user shall establish a fire safety responsibility system in accordance with the law. By establishing a fire inspection and inspection system and an emergency response system, the fire safety responsibilities at all levels and positions shall be clarified and responsible for the organization and implementation of daily fire safety management work.
3. Strengthen the management of fire, electricity and flammable combustibles in mobile lithium battery energy storage container power stations, adopt fire prevention measures, and effectively control the sources of fire danger.
4. There should be more than two entrances and exits in the equipment installation area of the mobile lithium battery energy storage container power station, and there should be fire lanes around them.
5. Regular fire drills shall be carried out to continuously enhance the fire safety quality of employees.
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