Thermal gas mass flow meter flange type

Overview.

Thermal gas mass flow meter is a new type of instrument used to measure and control the mass flow of gases, which is designed based on the principle of thermal diffusion (heat conduction). The instrument adopts the constant temperature difference method for accurate measurement of gases, and can be applied to monitor the flow of air, oxygen, nitrogen, argon, helium, hydrocarbon gases and other gases in petroleum, chemical, steel, metallurgy, electric power, light industry, medicine, environmental protection and other industrial sectors.

◆Product implementation standard: GB/T20727-2006 (national standard)

◆General standard of flange: GB/T9119-2010 (national standard)

Working principle.

The sensor part of the thermal gas mass flow meter consists of two reference-level platinum resistance temperature sensor, the instrument works, a sensor uninterrupted measurement of the medium temperature T1; the other sensor since heated to a temperature higher than the medium T2, it is used to sense the fluid flow rate, called the speed sensor. The temperature △T = T2 - T1, T2 > T1, when there is fluid flow through, as the gas molecules collide with the sensor and take away the heat of T2, so that the temperature of T2 drops, if you want to keep △T constant, you have to increase the supply current of T2, the faster the gas flow rate, the more heat taken away, the gas flow rate and increased heat there is a fixed function of the relationship, which is the principle of constant temperature difference.

Because the sensor temperature than the medium (ambient) temperature is always automatically constant higher than a certain temperature (30 ~ 50 ℃ or so), so the thermal gas flowmeter from the principle of temperature compensation is not required.

From (1) (2) (3) formula can be seen, the flow rate and working pressure, gas density, working temperature function relationship has been determined. Constant temperature differential thermal gas mass flowmeter is not only not affected by temperature, but also not affected by pressure, thermal gas mass flowmeter is a direct type mass flowmeter, the user does not have to be corrected for pressure and temperature.

Insertion type thermal mass flow meter flow range

Insertion type thermal mass flow meter can be estimated by the corresponding flow rate range 0.56 ~ 56Nm / s, the calculation formula is as follows:

Features.

1. For gas flow measurement without temperature and pressure compensation, easy and accurate measurement, can get the gas mass flow rate or standard volume flow rate.

2. Wide range ratio, up to 100:1 or more, can be used for gas leak detection, especially in large pipe diameter, low flow rate, large changes in the flow range and very small flow measurement has obvious advantages.

3. Good anti-vibration performance, the accuracy is not affected by vibration.

4. Long service life, sensor without moving parts and pressure sensing components, simple installation, easy maintenance.

5. Fast response speed, small pressure loss, good repeatability.

6. Digital design, overall digital circuit measurement, LCD display intuitive and clear, accurate measurement.

7. Equipped with RS485 communication module or HART protocol (optional), with the upper computer can realize centralized management.

电磁流量计工厂运作氧量产生变化时，对经济性的最直接关系来自烟尘量造成的排烟热损失的转变，同时，它还会造成其他运行参数的改变，这些参数包含：炉渣未燃尽碳含量、排烟温度、送引风机总电耗、主汽温度和减温水量、再床温温度和减温水量。

变氧量运作对整台机组经济性的净影响是以上全部参数综合作用的结果。烟尘氧含量是锅炉空气污染物检测中至关重要的一项经济运行考核标准，在一定程度上，其值的大小是确定污染物排放浓度是否合格的关键。

烟尘氧含量控制是一个综合型、系统化的难题。在实际涡街流量计厂家生产中，锅炉间要安装必要的烟尘监管仪表，为运作管提供可量化参考依据；同时，只要确保设备系统的密闭性，加强运行管理，清除不规范操作行为，影响烟尘氧含量的众多要素是可以开展有效控制的，污染排放浓度也是能够依照国家标准规定开展监管的。