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1. How to apply electromagnetic flowmeter in denitrification precision ammonia spraying system
Electromagnetic flowmeter is the core flow monitoring equipment for achieving closed-loop precision control and return control in denitrification precision ammonia spraying system. It is mainly used to monitor the transport flow of conductive ammonia spraying medium (such as ammonia water with a mass concentration of ≥ 10%). In some scenarios, the flow rate of flue gas containing conductive medium can be monitored by an inserted electromagnetic flowmeter, providing accurate data support for dynamic adjustment of ammonia spraying amount.
1. Core application scenario (1) Monitoring the delivery flow rate of ammonia injection medium 1 For denitrification systems using ammonia water as a reducing agent, pipeline type electromagnetic flow meters are usually installed at the outlet of the ammonia water storage tank, the outlet of the transfer pump, and the straight pipe section in front of the spray gun to collect the volume flow rate of ammonia water in real time. Combined with online ammonia concentration sensors, it is converted into pure ammonia mass flow rate, providing the core input parameters for regulating the ammonia injection amount for the distributed control system (DCS). 2. The high-precision level of the electromagnetic flow meter (± 0.2%~± 0.5% level) can meet the precise flow accuracy requirements of ammonia injection, avoiding the blockage of the air preheater due to excessive ammonia injection caused by measurement deviation, catalyst poisoning, or NOx emissions exceeding the standard caused by insufficient ammonia injection. （2） Auxiliary monitoring of smoke flow rate 1 For wet denitrification or
II. Selection and Installation Standards (1) Selection Points 1 When measuring ammonia water medium, it is necessary to use lining materials that are resistant to ammonia corrosion, such as polytetrafluoroethylene (PTFE) or nitrile rubber. The electrode material should preferably be 316L stainless steel or Hastelloy alloy to avoid the failure of the flow meter caused by ammonia water corrosion. 2. The accuracy level should be selected as ≥ 0.5 level, and a high-precision electromagnetic flow meter with a precision of ± 0.2% level can be selected for detailed control scenarios to meet the accuracy requirements of ammonia injection adjustment in denitrification systems. 3. Insertion electromagnetic flow meters should be preferred for large-diameter ammonia water transportation pipelines to reduce installation costs and pipeline pressure drop. （2） Installation requirements 1 The pipeline type electromagnetic flowmeter should be installed in the straight section of the full pipe to avoid cavitation or sail tube phenomenon, and ensure that the measuring medium is completely filled in the measuring chamber. 2. The installation position should be fa
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