Recently, the General Department of the National Energy Administration issued a draft for comments on the Twenty-Five Key Requirements for Preventing Electricity Production Accidents ( 2022 Edition).
In order to do a good job in power safety supervision and effectively prevent power production accidents, the National Energy Administration organized relevant units and experts in the power industry to summarize the successful experience in preventing power production accidents from 2014 to the present, draw lessons from accidents, and combine the promulgated standards and specifications, The revision work was carried out on the "Twenty-five key requirements for the prevention of power production accidents" (Guo Neng Security [ 2014 ] No. 161 ), and the "Twenty-five key requirements for the prevention of power production accidents ( 2022 version)" was formed (for comments draft)". All units are invited to study and put forward their opinions and report them to the National Energy Administration (Department of Electricity Safety Supervision) before July 11 (Monday).
In the draft, it is clearly proposed to prevent electric power fire accidents. Among them, the prevention of fire accidents in electrochemical energy storage power stations has clarified the restrictions on the use of lithium batteries, sodium-sulfur batteries and echelon batteries.
2.12.1 The site of the electrochemical energy storage power station shall not be located adjacent to or located in the place where the production, storage and operation of flammable and explosive dangerous goods shall be made, shall not be located in the place with dust and corrosive gas, and shall not be located in the important power within the facility protection zone.
Medium and large electrochemical energy storage power stations shall not use ternary lithium batteries and sodium-sulfur batteries, and should not use cascaded utilization power batteries; when selecting cascaded utilization power batteries, consistency screening should be carried out and safety assessment should be carried out in combination with traceability data.
2.12.2 Lithium-ion battery equipment rooms shall not be set up in crowded places, and shall not be set up in buildings or underground spaces where people live or move. The lithium-ion battery equipment room should be arranged in a single layer, and a prefabricated cabin should be used. In the station-type lithium-ion battery equipment room, the battery capacity of a single fire compartment should not exceed 6MW • h ; when it exceeds 6MW • h , a fixed automatic fire extinguishing system should be installed indoors, and the fire extinguishing effect and technical parameters of the system should comply with the provisions of 2.12.6 of this document .
2.12.3 The circuit of the energy storage battery unit should be equipped with DC circuit breakers and other breaking devices, and the battery cluster should be equipped with cluster-level circuit breakers. The battery management system should have power protection functions such as overvoltage, undervoltage, differential pressure, and overcurrent, and non-power protection functions such as overtemperature, temperature difference, and gas, and can issue graded alarm signals or trip commands to achieve local fault isolation.
2.12.4 The flammable gas detection device should be installed in the lithium ion battery equipment room. When the concentration of H2 or CO is greater than 50 × 10-6 ( volume ratio), the cabin and cluster circuit breakers should be disconnected in linkage, and the ventilation system and alarm should be activated in linkage device.
A combustible gas detection device should be installed in the lead- acid / lead-carbon and flow battery room, and the ventilation system and alarm device should be activated in linkage.
2.12.5 An explosion-proof ventilation system should be set up in the lithium-ion battery equipment room, with at least one air outlet up and down , and the total exhaust air volume per minute should not be less than the volume of the equipment room (it can be calculated according to the clear space after deducting the volume of batteries and other equipment) , Set the position of air inlet and air outlet reasonably, and it is strictly forbidden to produce short circuit of air flow. The ventilation system should be in normal operation.
2.12.6 An automatic fire alarm system shall be set up in the electrical equipment room of the electrochemical energy storage power station. A fixed automatic fire extinguishing system should be set up in the battery equipment room of the new (renovated and expanded) large-scale lithium-ion battery energy storage power station; the fire extinguishing system should meet the requirements of extinguishing the module-level battery open fire and not re-igniting within 24 hours . The system type, flow, pressure and other technical parameters The module-level battery entity fire simulation test verification should be carried out by a state-authorized institution.
2.12.7 The equipment rooms, partition walls, battery racks, partitions and other pipeline openings and cable inlets and outlets of the electrochemical energy storage power station shall be tightly sealed with fireproof sealing materials. The ventilation openings, holes, doors, cable trenches, etc. of the equipment room (cabin) shall be provided with facilities to prevent the entry of rain, snow, sand and small animals.
2.12.8 The operation and maintenance unit of the electrochemical energy storage power station shall formulate operating procedures for fire protection facilities, carry out regular maintenance, and conduct a comprehensive inspection at least once a year to ensure that the fire protection facilities should be in normal working condition. Before being put into operation, the operation and maintenance unit should prepare emergency plans for possible battery thermal runaway, fire and other emergencies, establish a coordination mechanism with local fire rescue agencies, and conduct regular drills. Operation and maintenance personnel should be qualified for fire protection training before they can take up their posts.