Application of Thermal Gas Flow Meter in Aeration Control

Abstract: The application information of thermal gas flow meter in aeration control is provided by excellent flow meter and flow meter manufacturers. Introduction Urban sewage is a product of urban development. A large amount of sewage is dumped into the water body and soil, destroying the natural ecology of the water body and soil, causing the disappearance of species in the water body, disappearance of fish and shrimp, and becoming a stinky river and dead lake. Heavy metals and toxic substances in the soil are enriched and polluted. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application article details of thermal gas flowmeters in aeration control. Introduction Urban sewage is a product of urban development. A large amount of sewage is dumped into the water body and soil, destroying the natural ecology of the water body and soil, causing the disappearance of species in the water body, disappearance of fish and shrimp, and becoming a stinky river and dead lake. Heavy metals and toxic substances are enriched in the soil, and pollutants are harmful through the food chain Our health has caused huge economic losses and restricted the sustainable development of urban society and economy, so we have to carry out sewage treatment projects to improve our living environment. Blast aeration is a key parameter control in sewage treatment, and there are many parameters that affect the aeration volume, such as influent load, sludge quality and so on. Dissolved oxygen has a hysteresis, and it is more complicated to use a dissolved oxygen meter to automatically control the number of fans on and off and change the air volume. The control of this parameter is very important, and it is necessary to use advanced technology to control this. Moreover, the power consumption of aeration control accounts for about 80% of the sewage treatment plant. It is also a trend to reduce consumption through control. 1. Working principle of TF100 thermal gas mass flowmeter The thermal gas mass flowmeter adopts the principle of thermal diffusion. Thermal diffusion technology is a technology with excellent performance and high reliability under harsh conditions. Its typical sensing element includes two thermal Resistor (Platinum RTD), one is a speed sensor and the other is a temperature sensor that automatically compensates for changes in gas temperature. When the two RTDs are placed in the medium, where the speed sensor is heated to a constant temperature difference above ambient temperature, the other temperature sensor is used to sense the medium temperature. The mass flow of gas through the velocity sensor is calculated from the amount of heat transfer from the sensing element. As the gas velocity increases, the heat transferred by the sensor to the medium increases, so more power needs to be supplied, and the power of the electronic unit to heat the RTD has a certain corresponding relationship with the mass flow. Its relationship is shown in formula (1):ρυ=K(Q/△T)1.67…………………(Formula 1) whereρ——The density of the fluid, Kg/m3;υ——Fluid velocity, m/h; K——Calibration coefficient; Q——Heat flow, J/h; △T——Temperature difference, °C. 2. Technical features (1), direct gas mass flow detection, independent of temperature and pressure, without temperature and pressure compensation. (2), can be equipped with a sealed ball valve for maintenance. Cleaning can be carried out in production without stopping production. (3) The flow velocity range is between 0.5m/s and 60m/s, which is especially suitable for working conditions with large pipe diameters. (4) The probe has no moving parts and is not sensitive to the effect of particle attachment in the medium. (5), based on the principle of molecular measurement, it can detect tiny flow, with sensitive response and no dead zone. (6), there is no medium pressure loss. 3. Introduction to the control process The aeration tank is a very important part of sewage treatment. The size of the aeration volume not only involves the amount of air consumption, but more importantly, the control of the aeration volume, which is the key parameter for the control of microorganisms in the sewage. The control of oxygen content , The oxygen content is not well controlled, the microorganisms in the sewage are out of control, and the ratio of nitrogen molecules and phosphorus molecules in the water is out of control, which directly affects whether the indicators of sewage treatment are qualified. TF100 flowmeter plays a key role in the control of oxygen content in the aeration tank and is the eye of the control system. Based on the heat gain principle of the flowmeter, the flowmeter does not require temperature and pressure compensation, and can output 4~20mADC flow and temperature Signal. After measuring the aeration flow, the control system compares it with the oxygen demand, and the generated feedback signal controls the action of the regulating valve. When the aeration volume is greater than the required amount, the valve opening decreases; when the aeration volume is less than the required amount, the valve The opening degree is increased to make the air supply meet the requirements. 4. Conclusion The high reliability and repeatability of SAILSORS' TF100 thermal gas mass flowmeter, as well as the on-site maintenance-free, many advantages make the product play an increasingly obvious role in the blast aeration measurement system. It is not only suitable for aeration measurement, but also for waste gas recovery and other processes in sewage treatment, which provides an important guarantee for sewage treatment. SAILSORS has been committed to the development and research of thermal mass flow meters, and has a deep understanding of its applications in various industries. At the same time, it is also more committed to serving Chinese enterprises with advanced technology, high-quality service and accurate system solutions. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Application of Thermal Gas Flow Meter in Aeration Control'

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