AG-NH07 ammonia escape on-line monitoring system
The importance of ammonia escape analysis in coal burning boiler SCR/SNCR in thermal power plants and heating plants out of stock process requires real-time online monitoring of NH3 escape. The monitoring results can guide the optimization of the injection amount of reducing agent ammonia, so as to achieve the purpose of improving out of stock efficiency.At the same time, NH3 escapement can be effectively controlled to reduce the generation of ammonium salt, avoid corrosion and harm to the downstream equipment, prolong the service life of catalyst and save operating costs.
The out of stock SCR/SNCR process mostly adopts the reduction principle of high temperature ammonia method, which determines the measurement environment of high temperature and high dust for escaping NH3.The non-contact and spectral characteristics of ultraviolet absorption spectroscopy make it the best method to measure escaping NH3.The traditional escaping NH3 analyzer adopts In situ (in-suit) measuring structure, which is complicated In installation and maintenance, and is greatly influenced by the flue gas conditions of flue size In practical application, so the test results cannot meet the accuracy and reliability requirements of monitoring escaping NH3 In the out of stock process.
Ag-nh07 laser escape ammonia on-line monitoring system adopts high temperature thermal extraction technology to effectively solve the problem of sample loss of escaping NH3. It has the characteristics of high sensitivity, fast speed, no interference from background gas, non-contact optical measurement, etc., and can accurately reflect the changes of escaping ammonia in real time
TDLAS technical features
Tunable semiconductor laser absorption spectroscopy (TDLAS) is essentially a spectral absorption analysis technique that takes advantage of the selective absorption properties of gas molecules to specific wavelengths of laser light to obtain gas concentrations.It differs from the traditional spectral absorption technology in that the spectral width of the semiconductor laser is much smaller than the broadening of the gas absorption line.Therefore, semiconductor laser absorption spectroscopy is a high resolution spectral absorption technology.
Product features
Ag-nh07 laser escape ammonia on-line monitoring system has the following main characteristics: heat and humidity sampling method, not subject to site installation conditions, wide applicability, simple use and maintenance;
Using the high resolution spectrum technology of TDLAS, the measurement is free from the interference of other gases, which can effectively reduce the interference of dust, background and gas. This characteristic has obvious advantages over other analysis methods.
Using the second harmonic principle, under the same optical path condition, the resolution is high, and the ultra-low concentration of NH3 can be measured.
The multi-line scanning technology can effectively lock the absorption peak position, reduce the background interference, and improve the signal to noise ratio and test sensitivity.
In-situ extraction of ag-nh07 type ammonia escape monitoring system
The in-situ extraction system integrates the high temperature sampling probe and the high temperature detection pool, which are directly installed on the flue pipe, and the flue gas is directly pumped into the high temperature detection pool for analysis and empties.As the sampling pipeline and the sample gas transmission process in the traditional extraction system are cancelled, the smoke sampling loss is minimized.The system is the closest to in-situ measurement method In form, which overcomes the limitation of in-situ measurement under installation conditions. Meanwhile, the integration of high temperature detection pool improves the measurement sensitivity and enables online calibration, ensuring the high precision and high reliability of escaped NH3 monitoring.In situ extraction system has a smaller installation space, which can realize on-site multi-point measurement.
Installed directly in the flue with the following built-in conditions
Smoke sampling and filtration system (high temperature sampling and ultra-fine filtration technology);
Filter backblow system (analyzer set backblow frequency);
Multiple reflection optical detection pool (≥10m optical path, detection sensitivity ≥0.2ppm);
Temperature control system (gas contact part more than 200 degrees heat, prevent ABS formation).
Technical specifications
Category parameter performance metrics
Technical indicators detection range 0-10ppm, 20ppm, 100ppm(settable)
Resolution of 0.2 PPM or less
Drift acuities were 1% FS
Optical path acuity 1.5 m
Response time ≤10s (including sampling)
Sample temperature ≤800℃
Sample gas pressure atmospheric pressure ±5kpa
Protection level Ip65
Preheat 30 min
Cabinet size: 1200*1200*400 (L*H*W)
4-20 ma analog output interface signals, maximum load 900 Ω
Digital output rs232/485
Relay output load capacity AC/DC 24/1a
Concentration limit alarm
Abnormal transmission rate alarm
Laser temperature abnormal alarm
Environmental parameter power supply ac200-240v
Sampling flow of 3L/min
Ambient temperature -10~55℃
Environmental pressure 70kpa-120kpa