Selection requirements for electromagnetic flowmeter | Selection of clamp type electromagnetic flowmeter

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1. How to select an electromagnetic flowmeter suitable for the denitrification and ammonia injection process? The electromagnetic flowmeter suitable for the denitrification and ammonia injection process should be of explosion-proof type, with corrosion-resistant lining and electrodes. The core parameters should match the on-site flow range, process temperature and pressure conditions, and explosion-proof environmental requirements.

1. Selection requirements for medium corrosion resistance: (1) Lining material: Water containing ammonia or liquid ammonia can corrode rubber lining and cause swelling failure. Rubber lining models should be prohibited, and polytetrafluoroethylene (PTFE) or Hastelloy alloy lining should be preferred, which can cover the conventional process temperature range of -20 ℃~180 ℃.

. （2） Electrode Material: Ordinary 30

4. 316 stainless steel electrodes cannot withstand corrosion from ammonia media and are prone to scaling or failure. Therefore, it is necessary to use Hastelloy C-27

6. Tantalum or platinum iridium alloy electrodes to ensure long-term measurement stability.

2. Matching Requirements for Process Parameters 1 Flow range: The denitrification ammonia injection flow rate has a large random load fluctuation range, and an electromagnetic flowmeter with a range ratio of ≥ 10:1 should be selected to cover the conventional flow range of 10L/h~5000L/h (larger units can relax to a higher range). The process control scenario can meet the requirements by using a 0.5 level accuracy, and the trade metering scenario needs to use a 0.2 level high-precision model. 2. Temperature and pressure level: The design of the ammonia injection pipeline usually has a Zhengzi state pre

ssure of 0.6MPa~1.6MPa, and the nominal pressure of the flowmeter needs to be ≥ this value; PTFE lining can be used for ammonia spraying at room temperature. If the medium temperature exceeds 100 ℃, it needs to be replaced with Hastelloy lining to ensure temperature resistance. 3. Flow field installation: It is necessary to ensure that the length of the front and rear straight pipe sections is not less than 5 times the diameter of the pipeline (5D in the front) and 3 times the diameter of the pipeline (3D in the back) respectively. If the on-site space is limited, an electromagnetic flowmeter with built-in rectifier can be installed to eliminate the interference of pulsating flow on measurement accuracy.

III. Requirements for on-site environment adaptation 1 Explosion proof requirements: The denitrification and ammonia spraying area belongs to Class IIA explosive gas environment, and an Exd II BT4 or above explosion-proof electromagnetic flowmeter that meets the GB 3836.1-2023 standard should be selected. The equipment grounding terminal should be reliably connected to the on-site grounding grid to avoid static electricity affecting measurement accuracy. 2. Protection level: For outdoor or dusty and humid on-site scenes, models with a protection level of IP67 or above should be selected; If there is a long-term risk of water immersion, a waterproof model with IP68 protection level should be selected.

2. The ten parameter requirements for selecting an electromagnetic flowmeter must be clearly defined

The ten parameter requirements that must be clearly defined when selecting an electromagnetic flowmeter are as follows

1. Measurement medium requirements: It is necessary to clarify what the measur

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