Detailed content of particle CEMS online monitoring system

Detailed content of particle CEMS online monitoring system

System Features

lBased on the forward scattering principle of particulate matter, it has extremely high sensitivity and resolution, and can continuously measure ultra-low concentration particulate matter emissions online;

lBy adopting the adaptive dynamic grading method, it is also possible to measure high particle concentration on-site, with an extremely wide dynamic range;

lThe smoke sampling design using the extraction and heating return method can be used in situations where the measured gas contains water mist.

lReal time continuous measurement of particulate pollutant concentration for various pollution emission sources, compatible with smoke monitoring systems, and capable of singleoneConnect one or several devices to form a smoke and dust monitoring network, sharing a front desk. The instrument can be used for monitoring smoke and dust in power plants, steel mills, cement plants, etc., and can also be used for process control of dust removal equipment and other powder engineering.

2System principle and composition

JNYQ-DUST-02 consists of four main parts, namely sampling and feedback unit, constant velocity tracking and control unit, heating and temperature control unit, and measurement and signal processing unit, as shown in Figure 2-1.

The sampling and return unit completes the process of sampling and returning the tested gas; The constant velocity tracking and control unit completes the measurement of the flow rate and sampling flow rate of the flue gas, while controlling the pumping force of the jet pump to change the sampling flow rate, thereby achieving the purpose of tracking and sampling; The measurement and signal processing unit consists of a laser, a measurement cavity, a photoelectric converter, a blowback and gas curtain device, and a calibration device. By measuring the forward scattered light of particulate matter, the concentration of particulate matter is converted into an electrical signal, which is then output after conditioning and conversion.

image 2-1system architecture

Figure 2-2 shows the measurement principle diagram. The highly stable laser emitted by the laser is collimated and enters the measurement chamber. When the laser beam meets the particles, forward scattered light is generated. The scattered light is received by the lens and then introduced into the photodetector through the signal fiber. After ultra-high sensitivity photoelectric signal conversion, the scattered light signal is converted into an electrical signal proportional to the concentration of the particles. After a specific algorithm, the concentration value of the particles is output.

image2-2 Measurement schematic diagram

3systemTechnical Specifications

nconcentration

Measurement principle: Extraction laser forward scattering

Measurement range: (minimum) 0-5 (mg/m3), () 0-200 (mg/m3)

Range selection: Dual range, automatic range switching can be set (if an external analog output signal is required, the relay needs to be determined to be on)

Control signal)

Indication error: ± 10%

Zero drift: ± 1.0% F.S

Range drift: ± 1.0% F.S

Resolution: 0.005 (mg/m3)

nSampling method:Extract heating and return

nCalibration method:Zero point and span automatic or manual calibration

nother

Particle concentration signal output: (1) Analog 4-20 (mA) (output load 500 Ω)

(2) RS485 (supporting Modbus protocol)

Range selection signal output: relay dry contact signal, contact capacity 30V/2A

Relay output open circuit: high range

Relay output short circuit: low range

Environmental requirements: temperature -40~55 (℃), relative humidity 0-100% R.H

Tested medium conditions: 10 ℃~250 ℃ (customized for high temperatures)

Display operation window: 12864 dot matrix LCD screen

Power supply: 220 ± 10% (VAC), 500W

Instrument gas requirements: clean and oil-free, pressure 0.3~0.8MPa

Instrument dimensions: 511mm * 410mm * 228mm (including flange, excluding probe)

Host weight: ≤ 21kg