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Product information
product name: Ammonia escape online monitoring system
product brand: Skyeaglee
Product number: SK6500
Measurement object: Automatic continuous monitoring: SO2 concentration, NOX concentration, dust particle concentration, flue gas flow, flue gas temperature, flue gas pressure and oxygen content, etc.
product description


I. System Overview

The denitrifying ammonia escape online monitoring system is produced by our company with honor. This system includes three parts: pretreatment system, gas analyzer, and data processing and display. The sampling method of this system is in-situ high temperature heat tracing extraction. ( TDLAS) 技术:激光光谱气体分析技术已经厂泛应用到对于灵敏度、响应时间、背景气体免干扰等有较高要求的各种气体监测领域。 The basic principle of this system is based on tunable semiconductor laser absorption light latent (TDLAS) technology: laser spectrum gas analysis technology has been widely applied to various gas monitoring fields that have high requirements for sensitivity, response time, and background gas interference-free.

The denitrification ammonia escape online monitoring system produced by our company is durable and easy to install, and is especially suitable for monitoring environmental and industrial process gas emissions, including coal-fired power plants, aluminum plants, steel plants, smelters, waste power stations, cement plants and chemical Factory etc.

I. System Overview

The denitrifying ammonia escape online monitoring system is produced by our company with honor. This system includes three parts: pretreatment system, gas analyzer, and data processing and display. The sampling method of this system is in-situ high temperature heat tracing extraction. ( TDLAS) 技术:激光光谱气体分析技术已经厂泛应用到对于灵敏度、响应时间、背景气体免干扰等有较高要求的各种气体监测领域。 The basic principle of this system is based on tunable semiconductor laser absorption light latent (TDLAS) technology: laser spectrum gas analysis technology has been widely applied to various gas monitoring fields that have high requirements for sensitivity, response time, and background gas interference-free.

The denitrification ammonia escape online monitoring system produced by our company is durable and easy to install, and is especially suitable for monitoring environmental and industrial process gas emissions, including coal-fired power plants, aluminum plants, steel plants, smelters, waste power stations, cement plants and chemical Factory etc.

Technical principles

TDLAS 技术测量氨气。 The core measurement module of our company's on-line monitoring system for denitrifying ammonia escape uses the most advanced TDLAS technology to measure ammonia.

Tunable Diode Laser Absorption Spectroscopy )是可调谐二极管激光吸收光谱技术的简称,由于激光二极管采用半导体材料制成,通常又称为可调谐半导体激光吸收光潜技术。 TDLAS ( Tunable Diode Laser Absorption Spectroscopy ) is the abbreviation of tunable diode laser absorption spectroscopy technology. Because laser diodes are made of semiconductor materials, they are also commonly referred to as tunable semiconductor laser absorption light latent technology.

技术参数 Third, the technical parameters

Fourth, system introduction
Flow principle
The flow path of this system is mainly composed of measuring flow path, back blowing flow path, calibration flow path and scroll cooling flow path. The specific flow path is shown below.


  The composition of this system is shown below:


2. Product parameters:


研发生产 , 统包括预处理系统、气体分析仪和数据处理与显示三大部分。 The SK6500 denitrification ammonia escape online monitoring system is developed and produced by Dong Ri Sun Energy , which includes three parts: pretreatment system, gas analyzer, and data processing and display. The sampling method of this system is in-situ high temperature heat tracing extraction. (TDLAS) 技术:激光光谱气体分析技术已经广泛应用到对于灵敏度、响应时间、背景气体免干扰等有较高要求的各种气体监测领域。 The basic principle of this system is based on tunable semiconductor laser absorption light latent (TDLAS) technology: laser spectral gas analysis technology has been widely used in various gas monitoring fields that have high requirements for sensitivity, response time, and background gas interference-free.


The SK6500 denitrification ammonia escape online monitoring system is developed and produced by Dong Ri Sun Energy, which includes three parts: pretreatment system, gas analyzer, and data processing and display. The sampling method of this system is in-situ high temperature heat tracing extraction. The basic principle of this system is based on tunable semiconductor laser absorption light latent (TDLAS) technology: laser spectral gas analysis technology has been widely used in various gas monitoring fields that have high requirements for sensitivity, response time, and background gas interference-free.
Technical advantages
Tunable Semiconductor Laser Absorption Spectroscopy (TDLAS)
This technology mainly uses the narrow line width and wavelength of the tunable semiconductor laser to change with the injection current to realize the measurement of single or several molecules of absorption lines that are very close and difficult to distinguish.
SK6500 denitrification ammonia escape online monitoring system main components: tunable semiconductor lasers, currently tunable semiconductor lasers commonly used in TDLAS technology include: Fabry-Perot lasers, distributed feedback semiconductor lasers, distributed Bragg Reflected (Distributed Bragg reflector) lasers, vertical-cavity surface-emitting lasers, and external cavity-tuned semiconductor lasers.
Principle of tunable semiconductor laser absorption spectroscopy
TDLAS usually scans an independent gas absorption line with a single narrow-band laser frequency. In order to achieve the highest selectivity, the analysis is generally performed at low pressure, and the absorption line will not be widened by pressure. This measurement method was proposed by Hinkley and Reid, and has now developed into a very sensitive and commonly used monitoring technology for trace gases in the atmosphere.
Key features of tunable semiconductor laser absorption spectra include
(1) High-selectivity, high-resolution spectroscopy technology, which is not affected by other gases due to the "fingerprint" feature of the molecular spectrum. This feature has clear advantages over other methods.
(2) It is a universal technology that is effective for all active molecules that absorb in the infrared. The same instrument can be easily converted to an instrument for measuring other components, only the laser and standard gas need to be changed. Because of this feature, it can be easily changed to an instrument that measures multiple components simultaneously.
(3) It has the advantages of fast speed and high sensitivity. Without losing sensitivity, its time resolution can be on the order of ms. The main fields of application of this technology are: molecular spectroscopy research, industrial process monitoring and control, diagnostic analysis of combustion processes, engine efficiency and vehicle exhaust gas measurement, explosion detection, and monitoring of trace pollution gases in the atmosphere.
R & D background
In the field of large-scale combustion of fossil fuels, such as coal-fired power, steel, cement, building materials, food, etc., pre-combustion or post-combustion NOx control technology denitration devices are installed, and post-combustion NOx control technology can be selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR), but the basic principle is the same no matter which method is used, that is, by injecting hydrogen into the reactor Reacts with nitrogen oxides to produce water and N2. The injected ammonia can be directly in the form of NH, or NH3 can be obtained by urea decomposition and released first, and then injected. Regardless of the form, controlling the injection amount of ammonia and the spatial distribution of ammonia in the reaction zone can maximize the reduction of NOx emissions. Too little ammonia injection will reduce the reduction and conversion efficiency. Excessive ammonia injection will not only reduce NOx emissions, but the excess ammonia will cause NH3 to escape from the reaction zone. The escaped NH3 will occur with sulfate produced in the process. The reaction produces ammonium sulfate, which is mainly ammonium bisulfate. The ammonium salt will precipitate on the surface of the solid components downstream of the tail flue of the boiler, for example, on the surface of the air preheater fan, which will cause severe equipment corrosion and therefore bring about expensive maintenance costs. Ammonia escape also occurs when the distribution of injected ammonia in the reaction zone does not match the distribution of NO and N02. The escape of high ammonia content is accompanied by N0. The reduction of conversion efficiency is a very bad phenomenon and a serious problem.
1> Harm of ammonia escape
Wasted ammonia causes waste of money and environmental pollution
Ammonia escape will corrode the catalyst module, cause catalyst deactivation (failure) and blockage, shorten catalyst life
The escaped ammonia will form ammonia sulfate with SO3 in the flue gas (corrosive and cohesive), which will block and corrode the heat storage element of the air preheater located downstream of the denitration;
Excessive denitrified ammonia will be absorbed by fly ash, making fine ash (grey brick) unavailable for sale;
2> Technical difficulties of traditional methods
Traditional methods include: traditional extraction methods, laser in situ measurement, half in situ and half extraction, etc.
Because NH3 is a very active gas, chemical reactions will occur during the sampling process, and most of the ammonia injection and denitration methods are arranged at high temperature and high dust. The traditional measurement method is the direct installation measurement method of the flue (the light path runs through the pipeline). Optical instrument transmitting and receiving probes are susceptible to corrosion, inadequate measurement accuracy due to the influence of flue gas and dust, loose parts due to mechanical vibration, measurement parameters affected by process parameters such as temperature and pressure, and inconvenience in operation and maintenance; meanwhile, the extraction method due to heat tracing A long pipeline will cause a chemical reaction of NH3 during the extraction process.

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