2023电站安全阀选型导则

电站安全阀选型导则II目次前言 II1 范围 1规范引文件 1术语定义 1结构式 2选型求 4产品型 5选型料 7附录A（料附）选型据表 9附录B资性录）修正数 10附录C资性录）阀门型表 17PAGEPAGE1电站安全阀选型导则范围本文件规定了火力发电厂用安全阀、动力驱动泄放阀和脉冲式安全装置（以下简称：阀门）的结构形式、选型要求、产品选型、选型资料等内容。41MPa625（）GB/T1047管道元件公称尺寸的定义和选用GB/T1048管道元件公称压力的定义和选用GB/T1221耐热钢棒GB/T2900.48-2008电工名词术语锅炉GB/T12228通用阀门碳素钢锻件技术条件GB/T12229通用阀门碳素钢铸件技术条件GB/T12230通用阀门不锈钢钢铸件技术条件GB/T21465-2008阀门术语DL/T1820电站锅炉动力驱动泄放阀技术导则JB/T5263电站阀门铸钢件技术条件JB/T9625锅炉管道附件承压铸钢件技术条件JB/T12000JB/T13768NB/T47008承压设备用碳素钢和合金钢锻件NB/T47010承压设备用不锈钢和耐热钢锻件NB/T47044电站阀门NB/T47063电站安全阀GB/T2900.48-2008、GB/T21465-2008界定的术语和定义以及下列术语和定义适用于本文件。3.1安全阀safetyvalve当管道或设备内介质压力超过规定值时，启闭件（阀瓣）自动开启排放介质；低于规定值时，启闭件（阀瓣）自动关闭。对管道或设备起保护作用的阀门。[来源：GB/T21465—2008，定义2.2.1.9]3.2弹簧式安全阀directspringloadedsafetyvalveGB/T21465—20082.10.1.1]3.3带动力辅助装置的安全阀assistedsafetyvalve该安全阀借助一个动力辅助装置，可以在压力低于正常整定压力时开启。即使该装置失灵，阀门仍能满足本标准对安全阀的所有要求。[来源：GB/T21465—2008，定义2.10.1.9]3.4impulsetypesafetydevice是一种由主阀、脉冲阀、节流阀、截止阀和连接管道组成的重闭式压力释放装置。脉冲阀是一种直接载荷式安全阀，脉冲阀与主阀之间由连接管道连接，通过脉冲阀的启闭来控制主阀的开启、关闭。连接管道上设置节流阀，节流阀用来调节压力释放装置的启闭压差。截止阀安装在脉冲阀的入口管道上，可将脉冲阀解列。3.5动力驱动泄放阀power-actuatedreliefvalve是一种全部由动力源（3.6整定压力setpressure安全阀在运行条件下开始开启的预定压力，是在阀门进口处测量的表压力。在该压力下，在规定的运行条件下由介质压力产生的使阀门开启的力同使阀瓣保持在阀座上的力相互平衡。[来源：GB/T21465—2008，定义2.10.5.1]3.7排放压力relievingpressure整定压力加超过压力。[来源：GB/T21465—2008，定义2.10.5.6]3.8flowareaGB/T21465—20082.10.4.2]3.9unsealtypeGB/T21465—20082.10.6.2]3.10锅炉最大连续蒸发量boilermaximumcontinuousrating（BMCR）[来源：GB/T2900.48—2008，定义3.2.3]123451-阀体，2-阀座，3-下调整，4-阀瓣 阀体，2-阀座，3-下整环，4-上调整5-阀杆，6-冷却器，78-弹簧56-阀杆，7-8-9-手柄，10-调整螺丝，11-向套，12-上调整环 9-弹，10-调整螺，11-动力辅助装置，12-阀瓣图1弹簧式安全阀图2带动力辅助装置的安全阀1-脉冲阀，2-截止阀，3-节阀，4-连接管道，5-主阀 主阀体，2-导向套，3-主阀瓣，4-主阀56-电磁铁，7-弹簧，8图3脉冲式安全装置图4先导动力驱动泄放阀1-阀体，2-球芯，3-阀座，4-阀杆，5-执行机构，6-阀盖图5动力驱动泄放球阀ANB/T47063JB/T13768DL/T18201111钢种材料牌号标准代号最高使用温度/℃碳素钢20NB/T4700842525GB/T12228425A105GB/T12228425WCBGB/T12229425WCCGB/T12229425合金钢15CrMoNB/T4700855012Cr1MoVNB/T47008565F22Class3JB/T12000595F91JB/T12000650F92JB/T12000650WC6JB/T5263593WC9JB/T5263593C12AJB/T5263648ZG20CrMoVJB/T9625540不锈钢12Cr13GB/T122140020Cr13GB/T122148006Cr19Ni10NB/T4701070006Cr17Ni12Mo2NB/T4701070007Cr18Ni11NbNB/T47010700CF8GB/T12230700CF8MGB/T12230700NB/T47063NB/T470632%～4%。～230VAC/50HZ、5A755.11～5.15按要求的设计温度选定阀体材料，阀体材料的允许使用温度应不低于设计温度。按下列要求确定阀门的公称压力：NB/T47044阀门公称压力应符合NB/T47044GB/T10481表1 阀整压力安装位置整定压力锅筒或过热器出口额定工作压力p≤0.8MPa最低值工作压力+0.03MPa最高值工作压力+0.05MPa额定工作压力0.8MPa<p≤5.9MPa最低值1.04倍工作压力最高值1.06倍工作压力额定工作压力p>5.9MPa最低值1.05倍工作压力最高值1.08倍工作压力直流锅炉的过热器出口最低值1.08倍工作压力最高值1.10倍工作压力再热器1.10倍工作压力启动分离器1.10倍工作压力注：表中的工作压力是指安全阀安装地点的工作压力，对于脉冲式安全装置是指脉冲阀安装地点的工作压力。75%15%；1030%；12134当介质压力小于或等于10.3MPa时，按式（1）计算阀门的流道面积。式中：

A.

WtsP9KdK

(1)A ——2skgKd Ksh——过修系参见录B；P —排压，为兆（Pa放力P式计算：P=1.03Pset （2）式中：Pset——（Pa当介质压力大于10.3MPa，且小于或等于22.1MPa时，按式（3）计算阀门的流道面积。A 5P109（26P1000Kd33.2P1061

（3）当介质压力大于22.1MPa时，按式（4）计算阀门的流道面积。式中：

A.

WtsP9KdK

（4）Ksc——超临界修正系数，参见附录B。按下列要求确定阀门的公称尺寸：面积；阀门公称尺寸应符合GB/T10476.4确定阀门型号NB/T47063全装置的型号，按JB/T13768阀门选型表，参见附录C；附录A（资料性附录）选型数据表表A.1给出了阀门选型所需的技术参数和技术要求。表A.1选型数据表用户名称项目名称阀门标识系统编码阀门名称阀门型号数量/台安装位置设计温度/℃设计压力/MPa工作温度/℃工作压力/MPa公称压力PN（Class（公称尺寸DN（NPS（）工作介质整定压力/MPa排量/t/h启闭压差%结构形式弹簧式安全阀□全量型□全启式□微启式□脉冲式安全装置□带动力辅助装置的安全阀□动力驱动泄放阀□（连接方式法兰连接□入口法兰规格法兰材料出口法兰规格焊接连接□入口管座尺寸/mmØ×坡口形式出口法兰规格管座材料结构长度带动力辅助装置的安全阀气动□（M电磁动□（液动□（M辅助功能要求安全阀起跳后送出～230VAC/50HZ、5A的无源接点信号□介质压力达到整定压力的75%以上时，阀门具有非手柄开启的强制开启功能□执行标准NB/T47063□其他（备注PAGEPAGE10附录B（资料性附录）B.1过热修正系数Ksh见表B.1。

修正系数表B.1过热修正系数Ksh工作压力进口温度/℃(绝对压力)MPa205225250275300325350375400425450475500525550575600625过热修正系数0.500.9910.9680.9420.9190.8960.8760.8570.8390.8230.8070.7920.7780.7650.7520.740.7280.7170.7060.750.9950.9720.9460.9220.8990.8780.8590.8410.8240.8080.7930.7790.7660.7530.740.7290.7170.7071.000.9850.9730.950.9250.9020.880.8610.8430.8250.8090.7940.780.7660.7530.7410.7290.7180.7071.250.9810.9760.9540.9280.9050.8830.8630.8440.8270.810.7950.7810.7670.7540.7410.7290.7180.7071.500.9570.9320.9070.8850.8650.8460.8280.8120.7960.7820.7680.7550.7420.730.7180.7081.750.9590.9350.910.8870.8660.8470.8290.8130.7970.7820.7690.7560.7430.7310.7190.7082.000.960.9390.9130.8890.8680.8490.8310.8140.7980.7840.7690.7560.7440.7310.720.7082.250.9630.9430.9160.8920.870.850.8320.8150.7990.7850.770.7570.7440.7320.720.7092.500.9460.9190.8940.8720.8520.8340.8160.80.7850.7710.7570.7440.7320.720.712.750.9480.9220.8970.8740.8540.8350.8170.8010.7860.7720.7580.7450.7330.7210.713.000.9490.9250.8990.8760.8550.8370.8190.8020.7870.7720.7590.7460.7330.7220.713.250.9510.9290.9020.8790.8570.8380.820.8030.7880.7730.7590.7460.7340.7220.7113.500.9530.9330.9050.8810.8590.840.8220.8040.7890.7740.760.7470.7340.7220.7113.750.9560.9360.9080.8830.8610.8410.8230.8060.790.7750.7610.7480.7350.7230.7114.000.9590.940.910.8850.8630.8420.8240.8070.7910.7760.7620.7480.7350.7230.7124.250.9610.9430.9130.8870.8640.8440.8250.8080.7920.7760.7620.7490.7360.7240.7134.500.9440.9170.890.8660.8450.8260.8090.7930.7770.7630.7490.7370.7250.7134.750.9460.9190.8920.8680.8470.8280.810.7930.7780.7640.750.7370.7250.713表B.1（续）工作压力(绝对压力)MPa进口温度/℃205225250275300325350375400425450475500525550575600625过热修正系数5.000.9470.9220.8940.870.8480.8290.8110.7940.7790.7650.7510.7380.7250.7145.250.9490.9260.8970.8720.850.830.8120.7950.780.7650.7520.7380.7260.7145.500.9520.930.8990.8740.8510.8310.8130.7970.780.7660.7520.7390.7270.7145.750.9540.9330.9020.8760.8530.8330.8150.7980.7820.7670.7530.7390.7270.7156.000.9570.9370.9040.8780.8550.8340.8160.7980.7830.7680.7530.740.7270.7166.250.960.940.9070.880.8560.8360.8170.7990.7830.7680.7540.740.7280.7166.500.9640.9440.910.8820.8590.8370.8180.8010.7840.7690.7540.7410.7290.7166.750.9660.9460.9130.8850.860.8390.8190.8020.7850.7690.7550.7420.7290.7177.000.9470.9160.8870.8620.840.820.8020.7860.770.7560.7420.7290.7177.250.9490.9190.8890.8630.8420.8220.8030.7870.7710.7560.7430.730.7177.500.9510.9220.8910.8650.8430.8230.8050.7880.7720.7570.7440.730.7187.750.9530.9250.8930.8670.8440.8240.8060.7880.7720.7580.7440.7310.7198.000.9550.9280.8960.8690.8460.8250.8060.7890.7730.7580.7440.7320.7198.250.9570.9320.8980.8710.8470.8270.8070.790.7740.7590.7450.7320.7198.500.960.9350.9010.8730.8490.8280.8090.7910.7750.760.7460.7320.728.750.9630.9390.9030.8750.850.8290.810.7920.7760.760.7460.7330.7219.000.9660.9430.9060.8770.8520.830.8110.7930.7760.7610.7470.7340.7219.250.970.9470.9090.8790.8530.8320.8120.7940.7770.7620.7470.7340.7219.500.9730.950.9110.8810.8550.8330.8130.7950.7780.7630.7480.7340.7229.750.9770.9540.9140.8830.8570.8340.8140.7960.7790.7630.7490.7350.72210.000.9810.9570.9170.8850.8590.8360.8150.7970.780.7640.7490.7350.72210.250.9840.9590.920.8870.860.8370.8160.7980.780.7640.750.7360.72310.500.9610.9230.8890.8620.8380.8170.7990.7810.7650.750.7370.72310.750.9620.9250.8910.8630.8390.8180.7990.7820.7660.7510.7370.72411.000.9630.9280.8930.8650.840.8190.80.7820.7660.7510.7370.72411.250.9640.930.8930.8650.840.8190.7990.7810.7650.750.7360.72311.500.9640.9310.8940.8650.840.8180.7980.780.7640.7490.7350.722表B.1（续）工作压力(绝对压力)MPa进口温度/℃205225250275300325350375400425450475500525550575600625过热修正系数11.750.9650.9320.8940.8650.8390.8170.7970.780.7630.7480.7340.72112.000.9660.9330.8940.8640.8390.8170.7970.7790.7620.7470.7330.71912.250.9670.9350.8950.8640.8390.8160.7960.7780.7610.7460.7320.71812.500.9670.9360.8960.8640.8380.8160.7960.7770.760.7450.7310.71712.750.9680.9370.8960.8640.8380.8150.7950.7760.7590.7440.7290.71613.000.9690.9390.8960.8640.8370.8140.7940.7750.7580.7430.7280.71513.250.9710.940.8970.8640.8370.8130.7920.7740.7570.7410.7270.71313.500.9720.9420.8970.8630.8370.8130.7920.7730.7560.740.7250.71214.000.9760.9460.8970.8630.8350.8110.790.7710.7530.7370.7230.70914.250.9780.9470.8980.8620.8340.810.7890.770.7520.7360.7210.70714.500.9480.8980.8620.8330.8090.7870.7680.7510.7340.720.70614.750.9480.8980.8620.8320.8080.7860.7670.7490.7330.7190.70415.000.9480.8990.8610.8320.8070.7850.7660.7480.7320.7170.70315.250.9470.8990.8610.8310.8060.7840.7640.7460.730.7160.70215.500.9470.8990.8610.830.8040.7820.7630.7450.7280.7140.715.750.9460.8990.860.8290.8030.7810.7610.7430.7270.7120.69816.000.9450.90.8590.8280.8020.7790.7590.7410.7250.710.69616.250.9450.90.8590.8270.8010.7780.7570.7390.7230.7080.69416.500.9450.90.8580.8260.7990.7760.7560.7380.7210.7060.69216.750.9440.90.8570.8250.7970.7740.7540.7360.7190.7040.6917.000.9440.90.8560.8230.7960.7730.7520.7340.7170.7020.68817.250.9440.90.8550.8220.7940.7710.750.7320.7150.70.68617.500.9440.90.8540.820.7920.7690.7480.730.7130.6980.68417.750.9440.90.8530.8190.7910.7670.7460.7280.7110.6960.68118.000.9440.9010.8520.8170.7890.7650.7440.7250.7090.6940.67918.250.9450.9010.8510.8150.7870.7630.7420.7230.7060.6910.67718.500.9450.9010.850.8140.7850.7610.7390.720.7040.6890.674表B.1（续）工作压力(绝对压力)MPa进口温度/℃205225250275300325350375400425450475500525550575600625过热修正系数18.750.9450.9010.8490.8120.7830.7580.7370.7180.7010.6860.67119.000.9460.9010.8470.810.7810.7560.7340.7150.6980.6830.66919.250.9480.9010.8460.8080.7780.7530.7320.7130.6960.6810.66619.500.950.90.8440.8060.7760.750.7290.710.6930.6770.66319.750.9520.8990.8420.8030.7730.7480.7260.7070.690.6740.6620.000.8990.840.8010.770.7450.7230.7040.6870.6710.65720.250.8990.8390.7980.7670.7420.720.7010.6830.6680.65420.500.8990.8370.7950.7640.7380.7170.6970.680.6650.65120.750.8980.8340.7920.7610.7350.7130.6940.6770.6610.64721.000.8960.8320.790.7580.7320.710.6910.6730.6580.64321.250.8940.8290.7860.7540.7280.7060.6860.6690.6540.6421.500.8920.8260.7830.750.7240.7020.6820.6650.650.63621.750.8910.8230.7790.7460.720.6980.6790.6610.6460.63122.000.8870.820.7760.7430.7160.6940.6740.6570.6410.627B.2超临界修正系数Ksc见表B.2。

B.2Ksc工作压力进口温度/℃(绝对压力)MPa400425450475500525550575600625650超临界修正系数22.121.0560.9760.9220.8830.8510.8240.8010.7810.7620.7450.73022.251.0580.9780.9240.8840.8520.8250.8020.7810.7630.7460.73022.501.0630.9820.9260.8860.8530.8260.8030.7820.7630.7460.73122.751.0670.9850.9290.8870.8550.8270.8030.7830.7640.7470.73123.001.0720.9890.9310.8890.8560.8280.8040.7830.7640.7470.73223.251.0770.9930.9340.8910.8580.8300.8050.7840.7650.7480.73223.501.0820.9970.9370.8930.8590.8310.8060.7850.7660.7480.73223.751.0871.0010.9390.8950.8600.8320.8070.7850.7660.7490.73324.001.0931.0060.9420.8970.8620.8330.8080.7860.7670.7490.73324.251.0991.0100.9450.8990.8630.8340.8090.7870.7680.7500.73424.501.1061.0140.9480.9010.8650.8350.8100.7880.7680.7510.73424.751.1121.0190.9500.9030.8660.8360.8110.7890.7690.7510.73525.001.1201.0240.9530.9050.8680.8370.8120.7890.7690.7520.73525.251.1281.0290.9560.9070.8690.8390.8130.7900.7700.7520.73625.501.1361.0340.9590.9090.8710.8400.8140.7910.7710.7530.73625.751.1451.0390.9620.9110.8720.8410.8150.7920.7710.7530.73726.001.1551.0450.9660.9130.8740.8420.8160.7920.7720.7540.73726.251.1661.0500.9690.9150.8750.8430.8170.7930.7730.7540.73726.501.1781.0560.9720.9170.8770.8450.8180.7940.7730.7550.73826.751.1921.0620.9750.9190.8790.8460.8190.7950.7740.7550.73827.001.2061.0680.9790.9210.8800.8470.8200.7960.7750.7560.73927.251.2221.0740.9820.9240.8820.8480.8200.7960.7750.7560.73927.501.2391.0810.9850.9260.8830.8500.8210.7970.7760.7570.74027.751.2581.0880.9890.9280.8850.8510.8220.7980.7770.7580.74028.001.2781.0950.9920.9300.8870.8520.8240.7990.7770.7580.741表B.2（续）工作压力(绝对压力)MPa进口温度/℃400425450475500525550575600625650超临界修正系数28.251.3001.1020.9960.9330.8880.8540.8250.8000.7780.7590.74128.501.3231.1091.0000.9350.8900.8550.8260.8010.7790.7590.74228.751.3541.1171.0040.9370.8920.8560.8270.8010.7790.7600.74229.001.3901.1261.0070.9400.8930.8570.8280.8020.7800.7600.74329.251.4241.1341.0110.9420.8950.8590.8290.8030.7810.7610.74329.501.4571.1431.0150.9450.8970.8600.8300.8040.7810.7620.74429.751.4901.1511.0190.9470.8990.8610.8310.8050.7820.7620.74430.00…1.1581.0230.9500.9000.8630.8320.8060.7830.7630.74530.251.0981.0280.9520.9020.8640.8330.8060.7840.7630.74530.501.0831.0320.9550.9040.8650.8340.8070.7840.7640.74630.751.0901.0360.9570.9060.8670.8350.8080.7850.7640.74631.001.0991.0410.9600.9080.8680.8360.8090.7860.7650.74631.251.1071.0460.9630.9100.8700.8370.8100.7860.7660.74731.501.1151.0500.9660.9110.8710.8380.8110.7870.7660.74831.751.1241.0550.9680.9130.8720.8390.8120.7880.7670.74832.001.1331.0600.9710.9150.8740.8400.8120.7880.7670.74832.251.1421.0650.9740.9170.8750.8410.8130.7890.7680.74932.501.1511.0700.9770.9190.8770.8430.8140.7900.7690.75032.751.1601.0750.9800.9210.8780.8440.8150.7910.7690.75033.001.1701.0800.9830.9230.8790.8450.8160.7910.7700.75033.251.1801.0850.9860.9250.8810.8460.8170.7920.7700.75133.501.1901.0910.9880.9270.8820.8470.8180.7930.7710.75133.751.2011.0960.9920.9290.8840.8480.8190.7930.7720.75234.001.2111.1020.9950.9310.8850.8490.8200.7940.7720.75235.001.2551.1251.0070.9390.8910.8540.8230.7970.7750.75435.251.2671.1311.0110.9410.8930.8550.8240.7980.7750.75535.501.2781.1371.0140.9440.8940.8560.8250.7990.7760.755表B.2（续）工作压力(绝对压力)MPa进口温度/℃400425450475500525550575600625650超临界修正系数35.751.2901.1441.0170.9460.8960.8580.8260.7990.7760.75636.001.3011.1501.0210.9480.8980.8590.8270.8000.7770.75736.251.3131.1561.0240.9500.8990.8600.8280.8010.7780.75736.501.3241.1621.0270.9520.9010.8610.8290.8020.7780.75836.751.3361.1691.0310.9550.9020.8620.8300.8020.7790.75837.001.3471.1751.0340.9570.9040.8640.8310.8030.7790.75937.251.3581.1821.0380.9590.9060.8650.8320.8040.7800.75937.501.3691.1881.0420.9610.9070.