1.0.1 This code is formulated with a view to implementing the safe, applicable, economic and beautiful fossil-fired power plant (hereinafter referred to as "power plant") building design policy.
1.0.2 This code is applicable to the building design of newly-built and expanded power plant which has 125MW or above unit capacity, fires solid fossil fuel, and adopts direct firing mode.
1.0.3 The building design of the power plant shall be people oriented, correctly handle the interrelation between building, people and process, and make building layout and spatial array well according to such factors as use property, production flow, function requirements, natural conditions, building materials and building technology, and in combination with process design.
1.0.4 The design shall implement the fundamental national policies such as intensive land saving and building energy saving, comprehensively take disaster prevention measures such as fire prevention, earthquake resistance, explosion prevention, flood prevention and lightning stroke prevention, and reasonably solve such issues as building internal traffic, corrosion prevention, moisture resistance, noise prevention, vibration isolation, insulation, thermal insulation, sunlight, daylighting, natural ventilation and domestic installations.
1.0.5 The building design of the power plant shall positively adopt and popularize the new technology, new process and new material in building field, achieve safety and usability, advanced technology and economy and rationality, and meet the requirements of sustainable development.
1.0.6 The building design of the power plant shall consider the buildings and structures and the process equipment as one uniform integral, and complete the building modeling and internal treatment. Attention shall be paid to the effects of building complex, internal and external color treatment as well as the coordination of color with ambient environment.
1.0.7 The building area of the plant auxiliary and subsidiary buildings as well as the chemical, electrical, thermal engineering and metal laboratories should comply with the current power professional standards, and those multi-storey or joint buildings shall be positively adopted if the conditions permit.
1.0.8 The building design of the power plant shall not only comply with this code, but also those in the current relevant ones of the nation.
2 Terms
2.0.1 Volume of main power building
The building of main power house covers turbine house, deaerator room, bunker bay (or deaerating bunker bay), boiler house, and shops in central control building, and the volume of main power building is the sum of the volume of each shop, and the specific calculation shall meet the requirements of Appendix A.
3 Essential Provisions
3.1 Categorization and Modular Coordination of Building
3.1.1 The power plant, according to process system and building function, may be categorized into: building of main power house, electrical building, coal & ash handling building, chemical building, desulfurization building, auxiliary building, subsidiary building, etc.
3.1.2 The power plant building may be categorized into industrial building and civil building according to its use property.
3.1.3 The civil building may be categorized into residential building and public building according to its use function.
3.1.4 The dimensions of locating axes such as column grid, bay and depth in the power plant building layout should meet the relevant requirements of the current national standards "Building Constructions-Modular Coordination-Unified Standards" GBJ 2 and "Building Constructions-Modular Coordination-Standards for Factory Buildings" GB/T 50006.
3.2 Fire and Explosion Prevention
3.2.1 The allowable building area of the fire zone above the main power house should not be greater than the building area of 6 units, and that underground shall not be greater than the building area of one unit.
3.2.2 Where the underground part of the indoor coal unloading device is connected with the underground transfer tower or the coal handling tunnel, the allowable building area of the fire zone shall not be greater than 3000m2.
3.2.3 The straight distance from the farthest point to the evacuation exit in the power distribution unit room shall not be greater than 15m. Both ends of the cable tunnel shall be arranged with emergency exits leading to the floor; where the length exceeds 100m, the spacing of the emergency exits shall not exceed 70m. Both ends of the basement of the coal unloading device and the end of the underground building of the coal handling system shall be arranged with emergency exits leading to the floor. Where the basement length exceeds 200m, the spacing of the emergency exits shall not exceed 100m.
3.2.4 Where the pipeline penetrates the fire wall, the gap between the pipeline and the fire wall shall be filled with fireproof material. Where the combustible or uninflammable pipeline with diameter greater than or equal to 32mm penetrates the fire wall, the fireproof material shall be filled, besides, fire retardance measures shall be taken.
3.2.5 The opening position where the cables are led to electrical cabinet, panel or control panel and console and the cavity where the cables penetrate into partition and floor slab in the building (structure) shall be blocked with cable firestop materials, and the fire endurance of the firestop assembly shall not be less than that of the penetrated object, and shall not be less than 1h.
3.2.6 Where the cable trench and cable tunnel pass in and out of the main power house, control building and power distribution unit room, the fire wall shall be arranged at the outer wall of the building. Grade A fire door shall be arranged in the fire wall of the cable tunnel.
3.2.7 The indoor evacuation doors of transformer room, power distribution unit room, generator outgoing cubicle, cable interlayer and cable shaft, etc. shall be Grade B fire doors, but the doors in the middle partitions in the above rooms may be two-way swing doors made of incombustible materials.
3.2.8 The coal crusher room, transfer tower and silo belt conveyor room may be arranged with a steel ladder whose clear width is not less than 800mm and gradient not greater than 45° as the emergency exit. The connected coal conveyor gallery shall not be used as the emergency exit. Where the length of the coal conveyor gallery exceeds 200m, a middle emergency exit shall be arranged additionally.
3.2.9 Where the coal handling buildings such as gallery and transfer tower are arranged with automatic sprinkler system or water spray extinguishing system or open type gallery, fire prevention measures may not be taken for their steel structures.
3.2.10 Where the dry coal shed adopts the steel structure, the steel structure within 5m above the steel structure root shall be taken with fire prevention measures, and its fire endurance shall not be less than 1h.
3.2.11 In the material storage, a fire wall shall be arranged between the special material storage and the general material storage.
3.2.12 The grading of combustibility of decoration shall meet the relevant requirements of the current national standard "Classification for Burning Behavior of Building Materials and Products" GB 8624. The combustibility of the common interior decoration may be graded according to Appendix B.
3.2.13 The ceiling and wall decoration of central (unit) control room, electronic computer room and communication room in the central control building of main power house shall adopt Grade A materials, and the floor and other decoration shall adopt the materials not less than Grade B1.
3.2.14 Where the rooms adopt gas for fire extinguishment, the walls, suspended ceilings as well as doors and windows of the rooms shall meet the requirements of leak tightness, fire endurance and compressive strength, etc. according to the provisions of the relevant codes with regard to the adopted gas types.
3.2.15 The hydrogen generation plant and hydrogen supply station should be of open or semi-open type. The room with explosion hazard and the room without explosion hazard shall be separated with the non-inflammable explosionproof protection wall whose fire endurance is not less than 3h, and the emergency exit leading to the outside shall be arranged.
3.2.16 The calculation of pressure relief area of Category A and B plants with explosion hazard shall meet the requirements of the current national standard "Code of Design on Building Fire Protection and Prevention" GB 50016. The pressure relief facilities should adopt light-weight roof board, light-weight wall, easy-to-relieve-pressure doors and windows, etc., and shall not adopt simple glass.
The arrangement of the pressure relief facilities shall keep clear of the personnel crowded places and the main traffic roads, and should approach the position with explosion hazard. The unit mass of light-weight roof board and light-weight wall as pressure relief facilities should not exceed 60kg/m2.
3.2.17 Where the motor repair position has the work section using organic solvent for washing and paint spraying or is stored with other inflammable materials, the parking and repair positions shall be arranged with fire partitions. The arrangement and requirements of the fire partitions shall be in accordance with the current national standard "Code for Fire Protection Design of Garage, Motor-repair-shop and Parking-area" GB 50067.
3.2.18 The design of fire protection for the buildings in the power plant shall not only comply with this code, but also the relevant requirements of the current national standards "Code for Design of Fire Protection for Fossil Fuel Power Plants and Substations" GB 50229, "Code of Design on Building Fire Protection and Prevention" GB 50016 and "Code for Fire Prevention in Design of Interior Decoration of Buildings" GB 50222.
The fire hazard and the fire resistance grade of the buildings in the production process shall meet the requirements of the current national standard "Code for Design of Fire Protection for Fossil Fuel Power Plants and Substations" GB 50229.
