Integrated online monitoring instrument for monitoring ammonia escape during denitration

Abstract

The invention discloses an integrated online monitoring instrument for monitoring ammonia escape during denitration. The instrument comprises a case, a gas inlet, a heating pretreatment device, a sampling and calibration device, an ammonia analysis device, a data processing and display device, a temperature control device and a power supply and external interface device, wherein the heating pretreatment device comprises a heater, a high-temperature ball valve and a secondary filter; the data processing and display device comprises a CPU (central processing unit), a data transmission module and a liquid crystal display screen; the sampling and calibration device comprises a sampling pump, a calibration electromagnetic valve and an interference electromagnetic valve; the input end of the high-temperature ball valve is connected with an external tracing pipe through a pipeline and the gas inlet, and the output end of the high-temperature ball valve is connected with the input end of the secondary filter through a pipeline; the output end of the secondary filter is connected with the ammonia analysis device through a pipeline, and the ammonia analysis device is connected with the sampling pump. The monitoring instrument can be used for measuring various gases and effectively prevent mutual interference of components and is high in measurement sensitivity and free of interference of background gas, and the response time is short.

Description

technical field [0001] The invention belongs to the field of gas monitoring, in particular to an integrated on-line monitor for denitrification ammonia escape. Background technique [0002] At present, most of the NH3 on-line monitoring adopts laser in-situ penetrating measurement technology or dilution sampling, conversion into NO, and chemiluminescence measurement technology for monitoring; [0003] Dilution sampling, conversion to NO, and chemiluminescence measurement technology are indirect measurement methods. The installation method is: dilution extraction, connected to the analysis cabin through the gas path; first dilute the gas to avoid water vapor condensation, and then convert it; it has the following disadvantages : 1. The measurement accuracy is low, and errors will be introduced in the process of gas dilution and conversion, and the errors will be enlarged; 2. The on-site installation is more complicated, and an analysis cabin needs to be built. Wiring between ...

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Problems solved by technology

[0003] Dilution sampling, conversion to NO, and chemiluminescence measurement technology are indirect measurement methods. The installation method is: dilution extraction, connected to the analysis cabin through the gas path; first dilute the gas to avoid water vapor condensation, and then convert it; it has the following disadvantages : 1. The measurement accuracy is low, and errors will be introduced in the process of gas dilution and conversion, and the errors will be enlarged; 2. The on-site installation is more complicated, and an analysis cabin needs to be built. Wiring between the flue and the analysis cabin is required, and ultra-low dew points need to be provided Compressed air; 3. The system structure is complex and maintenance is troublesome; 4. The cost of system production and use is high; 5. The response time of the system is poor, which affects the efficiency of gas analysis

[0004] The installation method of laser in-situ through-penetration measurement technology is in-situ through-type installation; although the more advanced TDLAS direct measurement technology is adopted, there are the following defects: 1. The measurement accuracy is low, and it is easy to be affected by dust in the flue and Interference from changes in temperature, pressure, and flow rate; 2. For large flues, due to the limitation of the optical path, they can only be installed in corners, and the measurement points are not typical; 3. On-site installation is more complicated, and two holes need to be opened on the flue. And align the optical path; 4. It is greatly affected by the vibration of the flue, because the vibration of the flue will cause the optical path to change; 5. It does not have the automatic calibration function, and the calibration is troublesome. The probe needs to be removed and calibrated with a calibration tube; 6. Maintenance Troublesome, need to remove the probe for maintenance, 7. Low industrial and mining adaptability, not suitable for high dust and high temperature occasions; 8. High cost of system production and use

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