低浓度烟尘测量技术简介

Correlation equation:
y=
-0.176 + 1.087
x +
0.00999
x2
Summary of Acceptance Criteria for PS-11 Criterion Correlation coefficient Confidence interval Actual 0.984 2.02% 5.4% Allowable > 0.85 < 10% < 25% Acceptable? yes yes yes
#2现场按PS-11 规范线性和多项式修正
Specification 0–250 mg/m3 ±20%未进行污染源校正 ±10% 进行污染源校正后 0.25 mg/m3 @ 15-分钟系统整合 T9015 minutes 200 ° C 40% 4-20 mls
Accuracy准确度 Detection limit最低检测限 Response time响应时间 Max stack temperature烟气温度 Flue gas烟气湿度 Velocity range流速范围
PM
TEOM-锥形振荡微量天平
• 锥形原件在其自然频率下振荡 • 颗粒物被连续采集在滤膜上 • 累积质量导致频率变小
1 1 ΔM(g) K o f2 f2 o 1
ΔM(g) = 质量变化 K0 = 弹性常数 （包括质量转化系数） f0 = 初始频率(Hz)
• 质量与频率变化有直接关系
• 技术 • 前散射 • TEOM质量参比 • 质量流量控制器并加热 • 平台 • i-Series. (e.g., MODBUS) • 区别 • 内部质量参比 • 可溯源至NIST标准 • 可远程校准 • IP • TEOM内部质量参比（已获得美国专利）
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Acceptable? yes yes yes
Tolerance interval
* Indicates correlation coefficient is undefined. Check for Correlation Curve Minimum/Maximum Correlation curve minimum point Minimum allowable x value Is correlation curve minimum < minimum x value? Correlation curve maximum point Extrapolation limit for x (125% of maximum x value) Is correlation curve maximum > extrapolation limit?
PM CEMS Flow Diagram 气路图
Wet stack applications
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Probe Monitor 探头
3-way bypass valve 3通旁路阀
Forward light scattering – continuous
• Probe Controller, Model 3880i 探头控制器，3880i型
• Flow control流量控制 • Power regulation电源管理 • Data management数据处理
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PM CEMS Product Design
Summary of Acceptance Criteria for PS-11 Criterion Actual Allowable > 0.85 Correlation coefficient 0.985 Confidence interval Tolerance interval 1.53% 5.1% < 10% < 25%
-133.17 0.0 yes NA NA NA
* Indicates correlation coefficient is undefined.
Plot of Linear Regression Line
40 35 30 25 20 15 10 5 0 0.0
PM Concentration
y = 0.8716x + 0.0968
Nozzle 采样嘴
MFC Bypass Return MFC Dilution 24 VDC Power Supply Transformer变压器
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Biblioteka Baidu
Motherboard主板
PM CEMS: Specifications
Parameter
Range量程
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测试数据
Emission Unit: Miller U1, Thermo PM CEMS PMwet Data Test Dates: 41244
Emission Unit: Miller U1, Thermo PM CEMS PMwet Data Test Dates: 41244 Correlation equation: y= 0.097 + 0.872 x
Summary of Acceptance Criteria for PS-11 Criterion Actual Allowable > 0.85 Correlation coefficient 0.996 Confidence interval Tolerance interval 3.04% 10.2% < 10% < 25%
前散射-连续 TEOM – periodic mass reference
TEOM-阶段性质量参比
All measurements adjusted for dilution and purge flows
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Probe Controller Model 3880i 探头控制器3880i
Furnace
SCR
CEMS Monitoring Points
ESP
Wet FGD
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Product Design
• Probe Monitor 探头
• Sample conditioning样品处理 • Sample delivery样品输送 • Measurement测量 • Mass reference质量参比
Acceptable? yes yes yes
* Indicates correlation coefficient is undefined. Check for Correlation Curve Minimum/Maximum Correlation curve minimum point Minimum allowable x value Is correlation curve minimum < minimum x value? Correlation curve maximum point Extrapolation limit for x (125% of maximum x value) Is correlation curve maximum > extrapolation limit?
• 探头控制器
• 气路控制 • 电源管理 • 数据管理
• 模拟量输出
• 6路电压输出: 0–100 mV, 1, 5, 10 V (可选) • 5% of full-scale over/under range (可选), • 6路电流输出: firmware configured 0-20 mA, 4-20 mA • 开关量输出: 1 路电源故障, 10 digital relays, 100 mA @ 200 VDC • 开关量输入:16 TTL level user select programmable • 串口: RS-232，RS-485 C-Link, MODBUS, & streaming • 以太网: 10Mbs • 静态或动态TCP/IP
广泛的应用基础
• 光散射方法在烟气、大气颗粒物测量中有非常多的应用 • 锥形微量振荡天平（TEOM）在大气颗粒物中1万多台的应用
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光散射-24*7*365运行
优点 • 易于安装 • 低维护量 • 低浓度下灵敏 限制 • 间接测量质量
• 测量颗粒物的间接特性 • 受颗粒大小、比重、形状的影响
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Diagram of PM CEMS
3-way bypass valve
3通旁路阀
Nephelometer Assembly 光散射组件 TEOM
Heated Bench Assembly 加热室 Dilution Assembly
稀释组件
Pump泵 MFC LPM
Correlation equation:
y=
0.486 + 0.758
x +
0.00285
x2
Summary of Acceptance Criteria for PS-11 Criterion Correlation coefficient Confidence interval Tolerance interval Actual 0.996 3.75% 9.9% Allowable > 0.85 < 10% < 25% Acceptable? yes yes yes
• 将液滴作为颗粒物
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PM
需要时使用微量震荡天平
• 实时测量 • 质量测量可溯源至NIST标准 • 质量与频率变化之间有直接的关系 • 锥形原件在它的自然频率下震荡 • 滤膜上颗粒物质量变化时频率增大
• 限制采样时长
• 准确度高
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-54.40 0.1 yes NA NA NA
* Indicates correlation coefficient is undefined.
Plot of Linear Regression Line
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PM Concentration
10 8 6
y = 1.1778x - 0.3008
12
Plot of Polynomial Regression Curve
30.0
40.0
50.0
PM CEMS Response
#1现场按PS-11 规范线性和多项式修正
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测试数据
Emission Unit: Bowen U1, Thermo CEMS PM wet Test Dates: 41275
Emission Unit: Bowen U1, Thermo CEMS PM wet Test Dates: 41275 Correlation equation: y= -0.301 + 1.178 x
f1 = 最终频率(Hz)
锥形原件
在大气颗粒物监测中被广泛使用、验证
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颗粒物CEMS
锥形振荡天平
+ 光散射
PMCEMS
准确度高
精度高
高精度，高准确度兼有
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典型测量位置
烟尘浓度典型测量位置
CEMS Monitoring Points
40 35 30 25 20 15 10 5 0 0.0
Plot of Polynomial Regression Curve
y = 0.0028x2 + 0.758x + 0.4859
10.0
20.0
30.0
40.0
50.0
PM CEMS Response
PM Concentration
10.0
20.0
y = 0.01x2 + 1.0866x - 0.1763
PM Concentration
4 2 0 -2 0.0 2.0 4.0 6.0 8.0 10.0 PM CEMS Response
10 8 6 4 2 0 -2 0.0 2.0 4.0 6.0 8.0 10.0
PM CEMS Response