How to select a flow meter for evaporating ammonia wastewater

Time: 2024-07-18
Equipment Configuration:Evaporated ammonia wastewater flowmeter

Ensure that the normal operation of the steam ammonia wastewater flowmeter and the necessary conditions for measuring accuracy of the measured fluid medium must be electrically conductive, measurable minimum conductivity ≥ 5μs/cm; measured fluid medium must be filled with pipeline to ensure the accuracy of the measurement.

Project Overview

一、Evaporated ammonia wastewater flowmeter measurement system must be well grounded to ensure normal and reliable work; evaporated ammonia wastewater flowmeter should meet the requirements of its front and back of the length of the straight pipe, in order to ensure that the measurement of accuracy and stability; in the vicinity of the evaporated ammonia wastewater flowmeter, should be avoided to interfere with the strong electromagnetic field.

二、Determination of the type of flow meter for evaporated ammonia wastewater

  • 1、One-piece and split type: one-piece and split type have their own advantages, the basic principles of selection are as follows: split type is generally used for the requirements of range selection, batch control, frequent or long-term immersion in water or other special requirements of the occasion; it is also used for more severe applications, such as: high temperature fluid, vibration sources and other environments; calibre greater than 1000mm or more, the sensor outdoor installation occasions, generally recommended! Split type. The advantages of the one-piece type are compact structure, can be observed in the pipeline field flow, without wiring and so on. Most of the occasions one-piece and split type can meet the use of requirements.
  • 2、Explosion-proof considerations: the user should be based on the flowmeter environment to determine whether there are explosion-proof requirements to determine the use of explosion-proof steam ammonia wastewater flowmeter.
  • 3、Flange type and sanitary type: sanitary type mainly includes stainless steel material clamping type, clamp type, threaded type, such as easy to install, clean and sanitary steam ammonia wastewater flowmeter. There are relatively high health requirements occasions, or the sensor requires frequent dismantling disinfection, or descaling, de-crystallisation and other occasions, you should choose sanitary electromagnetic flowmeter, in order to facilitate the flowmeter disassembly. Other occasions should be selected flange type.
  • 4、Other considerations: flowmeter selection, but also must consider the working pressure, medium temperature and ambient temperature, power supply, protection level, grounding electrode or grounding ring material.

三、Determination of calibre

The flowmeter for evaporating ammonia wastewater is capable of continuously measuring a wide range of flow rates, and the measurement range can be adjusted arbitrarily within the specified flow range of 0.5 to 15m/s (1.6 to 49ft/s). In general, the choice of flowmeter calibre is equal to the calibre of the process pipe, and easy to install, no pressure loss. In some working conditions (such as fluid media may cause deposits in the sensor, and low flow rate), in order to make the instrument work in the appropriate range of flow rate, in the process flow rate is more stable, and allows a certain pressure loss, you can choose the instrument calibre is smaller than the process pipe calibre, before and after the instrument with a reducer, so that the instrument within the local flow rate increase. For large diameter process pipeline, in the pipeline flow rate is low and process flow rate is more stable, you can choose a smaller calibre instrument, before and after the instrument with a reducer, on the one hand, can reduce the cost of the instrument, on the other hand, can also make the instrument run in the flow rate of a better range of linear. In order to ensure the accuracy of measurement, the central cone angle of the reducer should not be greater than 15 °, and the upstream side of the reducer joint should be at least 5 times the diameter of the process pipe straight section.

四、Recommended

Flow rate from the accuracy, economy and durability considerations, the recommended use of the flow rate range between 1 ~ 5m / s (3.3 ~ 16ft / s). In this range, the flowmeter measurement accuracy, good linearity, power loss is smaller, the fluid medium on the flowmeter liner and electrode wear and tear is also smaller. For fluid media containing solid particles, the recommended flow rate range is between 1 and 3 m/s (3.3 to 10 ft/s). This selection helps to avoid excessive wear on the liner and electrodes of the ammonia vapour flowmeter caused by suspended solid particles due to high flow velocities. For fluid media in pipelines that may cause deposits, the recommended flow rate range is between 2 and 5 m/s (6.5 and 16 ft/s). Higher flow rates make it easier to eliminate excessive deposits. Mounting the flow meter vertically is easy to eliminate excessive deposits.

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