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1、火力发电厂煤和制粉系统防爆设计规程1范围本标准规定了燃煤火力发电厂煤的输送、贮存、煤粉制备及其相关烟、风道等 粉尘爆燃的防爆设计基本要求。本标准适用于燃煤火力发电厂煤及制粉系统及其围包体（如原煤仓、煤粉仓、粗 细粉分离器以及筒仓等）内煤粉云的爆燃。煤与燃油混烧或煤与可燃气体混烧的火力 发电厂有关煤的部分应遵照本标准。本标准不适用于由于外部火焰或暴露于其他火源中而产生过大内压的围包体， 如有关锅炉燃烧室和锅炉燃烧系统的防爆要求，也不适用于爆轰和无限制的爆嫌（如 室外爆炸或蒸汽云爆炸）。2规范性引用文件下列文件中的条款通过本标准的引用而成为本标准的条款。凡是注日期的引用 文件，其随后所有的修改单（
2、不包括勘误的内容）或修订版均不适用于本标准，然而， 鼓励根据本标准达成协议的各方研究是否可使用这些文件的最新版本。凡是不注日 期的引用文件，其最新版本适用于本标准。GB/T 16426粉尘云最大爆炸压力和最大压力上升速率测定方法GB 50058爆炸和火灾危险环境电力装置设计规范DL/T 435-2004电站煤粉锅炉燃烧室防爆规程DUT 466-2004电站磨煤机及制粉系统选型导则DL 5000火力发电厂设计技术规程DUT 5035-2004火力发电厂采暖通风与空气调节设计技术规程DUT 5121-2000火力发电厂烟风煤粉管道设计技术规程DUT 5145-2002火力发电厂制粉系统设计计算技术
3、规定3术语和定义3.1基本概念3.1.1 煤自燃倾向性 coal spontaneous ignition tendency表征煤自燃难易的特性。煤的自燃倾向性与煤的吸氧量、含水量、全硫含量以 及粒度等特性有关。煤的自燃倾向性根据煤的吸氧量和全硫含量不同可分为如表 3.1.1所示的三个等级。3.1.2 惰性气体 inert gas致使系统中可燃物质不能维持燃烧的不燃烧、不反应气体。3.1.3 围包体 enclosure围包煤或煤粉的物体，分为房间、建筑物、容器、设备或管道等。3.1.4 原煤仓 raw coal bunker贮存原煤的围包体。3.1.5 筒仓 cylindrical silo作
4、为混煤设施、运煤系统缓冲设施和贮煤设施的圆筒形围包体。3.1.6 煤粉仓 pulverized coal bin贮存煤粉的围包体。1 ScopeThis standard specifies the basic requirements of explosion prevention design for coal conveying, storage and pulverized coal preparation of coal-fired power plant, as well as such design for relevant flue, air duct and dust ign
5、ition.This standard is applicable to coal and pulverized coal preparation system of coal-fired power plant, as well as explosion and ignition of pulverized coal cloud in enclosure (such as raw coal bunker, pulverized coal bin, coarse and fine pulverized coal separator as well as cylindrical silo etc
6、.). For coal-fired power plant using multi-fuel ignition of coal and fuel oil or that of coal and fuel gas, it shall comply with this standard for contents related to coal.This standard is not applicable to enclosure that produces extremely large internal pressure due to external flame or being expo
7、sed to other ignition source. If there are explosion prevention requirements of boiler furnace and boiler ignition system, it is not applicable to detonation and unconditional explosion and ignition.2 Normative ReferencesThe following documents contain provisions which, through reference in this sta
8、ndard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding corrections), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most rece
9、nt editions of the documents. For undated references, the latest edition of the normative document referred to applies.GB/T 16426 Determination for Maximum Explosion Pressure and Maximum Rate of Pressure Rise of Dust CloudGB 50058 Electrical installations design code for explosive atmospheres and fi
10、re hazardDL/T 435-2004 Code for the Prevention of Pulverized Coal Firing Furnace Explosions in Power Plant BoilersDL/T 466-2004 Guide for Type Selection for Pulverizers and Pulverizing Systems of Power StationDL 5000 Technical Code for Designing Fossil Fuel Power PlantsDL/T 5035-2004 Technical Code
11、for Heating Ventilation and Air Conditioning Design of Fossil Fuel Power PlantDL/T 5121-2000 Technical Code for Design of Thermal Power Plant Air & Flue Gas Ducts/ Raw Coal & Pulverized Coal PipingDL/T 5145-2002 Technical Code for Design and Calculation of Pulverized Coal Preparation System of Fossi
12、l-fired Power Plant3 Terms and Definitions3.1Basic conception3.1.1 Coal spontaneous ignition tendencyIt refers to characteristic of difficult degree of coal spontaneous ignition. Coal spontaneous ignition tendency is related to coals oxygen uptake capacity, moisture capacity, total sulfur content as
13、 well as granularity and other characteristics. According to difference of coals oxygen uptake capacity and total sulfur content, spontaneous ignition tendency may be divided into three grades as showed in table 3.1.13.1.2 Inert gasIt refers to incombustible gas without reaction, and it makes combus
14、tible material in system be unable to maintain burning.3.1.3 EnclosureIt refers to objects enclose coal or pulverized coal, such as room, building, container, facility or pipeline.3.1.4 Raw coal bunkerIt refers to enclosure used to store raw coal.3.1.5 Cylindrical siloIt refers to cylindrical enclosure used as coal-blending facility, cushioning facility of coal-transporting system and coal-storing facility.3.1.6 Pulverized coal binIt refers to enclosure used to store pulverized coal.
