1. System introduction

The continuous monitoring system for smoke and smoke emissions is a device that continuously monitors the concentration and total emission of gaseous pollutants and particulate matter emitted by air pollution sources and transmits the information to the competent authority in real time. It is called "Automatic Flue Gas Monitoring System" ( CEMS for short ) , which can discharge particulate matter, gaseous pollutant concentration ( mg/m3 ) and emission rate ( kg/h , t/d , t/a ) in flue gas from stationary pollution sources (such as boilers, industrial furnaces, incinerators, etc.) . Conduct continuous, real-time tracking tests.

The company's continuous monitoring system for smoke, dust and flue gas emission adopts advanced ultraviolet differential absorption spectroscopy technology + extraction heat and humidity method, extraction condensation method CEMS can measure SO2 , NOx ( NO , NO2 ), O2 , temperature, pressure, flow rate, dust, Humidity and other parameters, and can also analyze NH3 , Cl2 , H2S , O3 and other gases. Optional laser gas analyzer, the system can also analyze and measure HF and HCl at the same time . It can transmit all monitoring parameters to the user's DCS system, and communicate with the data system of the environmental protection department through the data acquisition instrument. The system equipment is placed in the analysis cabin, which is convenient for operation and maintenance; the whole system has a simple structure, modular design, strong stability and low operating cost.

2. System parameters

Flue gas temperature limit ( minimum / maximum ) : 0-300 (can be customized)

Sampling method: direct extraction

Equipment requirements for vibration: no vibration

Compressed air requirements for the entire system: 0.4Mpa or more, no oil and no water

Maximum air consumption: 2.2m3/h

Average air consumption: 0.45m3/h

Maximum airflow (L/min) : 2

Average airflow (L/min) : 1.5

Dimensions: 800mm * 600mm * 1800mm

Weight: about 150kg

Heat Trace Line Temperature: 120 º C to 200 º C

Probe heat tracing temperature: 120 º C to 200 º C

Protection class: cabinet IP42 , other IP65

Power supply: 220VAC ± 10% , 5000W

Ambient temperature : -20ºC to 50ºC _ _

Ambient humidity: 5%Rh ~ 95%Rh (non-condensing)

External output: 4-20mA , RS232 , RS485

Standard gas: 8L, cylinder

3. Testing items

1. Flue gas sampling method: high temperature tracing heat and humidity extraction type

2. SO2 , NOX measurement method : UV differential absorption spectroscopy ( DOAS ) analysis technology

O2 Measurement Method: Zirconia Oxygen Analysis

3. Flue gas temperature measurement method: thermistor (or thermocouple)

4. Flue gas pressure measurement method: pressure sensor

5. Measurement method of flue gas flow rate: differential pressure method ( pitot tube )

6. Flue gas dust measurement method: extraction laser forward scattering

7. Flue gas humidity measurement method: dry and wet oxygen method

4. System Features

1. Using UV differential absorption spectroscopy technology and chemometrics algorithm, the detection limit is low and the temperature drift is small;

2. It can directly measure NO and NO2 to obtain NOX , without NO2 → NO converter;

3. Not disturbed by factors such as particulate matter and moisture;

4. No optical moving parts, high reliability, no impact on the measurement by on-site vibration;

5. Adopt return optical path and high-quality spectrometer;

6. Avoid the common condensation method in the same industry at home and abroad. The condensed water absorbs SO2 at the gas-liquid separation, resulting in low measurement results and corrosion of the pretreatment pipeline.