Application of Thermal Gas Flow Meter in Aeration Control

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, disappearing fish and shrimp, and turning it into a stinky river and dead lake. The soil is enriched with heavy metals and toxic substances, and pollutants pass through food. Chain pollution endangers our health, causes huge economic losses, restricts the sustainable development of urban social economy, and makes us have to carry out sewage treatment projects to improve our living environment. Blast aeration is the key parameter control in sewage treatment. There are many parameters that affect the aeration rate, such as influent load, sludge quality and so on. Dissolved oxygen has hysteresis, so it is more complicated to use a dissolved oxygen meter to automatically control the number of fans to start and stop and to change the air volume. And the control of this parameter is very important. It is necessary to adopt advanced technology for this control. Moreover, the power consumption of aeration control accounts for about 80% of the sewage 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 elements include two thermal Resistance (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, one of the speed sensors is heated to a constant temperature difference above ambient temperature and the other temperature sensor is used to sense the medium temperature. The gas mass flow through the velocity sensor is calculated from the amount of heat transfer through the sensing element. As the gas velocity increases, the heat transferred from 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 rate. Its relationship is shown in formula (1):ρυ=K(Q/△T)1.67…………………(Formula 1) whereρ——Fluid density, Kg/m3;υ——Fluid velocity, m/h; K——Calibrated 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) It can be equipped with a sealed ball valve for inspection. Cleaning can be carried out during production without stopping production. (3) The flow velocity range is between 0.5m/s and 60m/s, especially suitable for working conditions with large pipe diameters. (4) The probe has no moving parts and is not sensitive to the influence of particle adhesion in the medium. (5) Based on the principle of molecular measurement, it can detect small flow, with sensitive response and no dead zone in display. (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 gas consumption, but more importantly, the control of the aeration volume is the control of the oxygen content, which is the key parameter for the control of microorganisms in the sewage. , The oxygen content is not well controlled, the microbial control in the sewage is out of balance, and the proportion of nitrogen molecules and phosphorus molecules in the water is out of control, which directly affects whether the various indicators of sewage treatment are qualified. The TF100 flowmeter plays a key role in the control of the oxygen content of the aeration tank, and is the eye of the control system. Based on the heat gain principle of the flowmeter, the flowmeter does not need temperature and pressure compensation, and can output 4~20mADC flow and temperature Signal. After the aeration flow is measured, the control system is compared with the oxygen demand, and the feedback signal generated controls the action of the regulating valve. When the aeration flow is greater than the required amount, the opening of the valve is reduced; when the aeration amount is less than the required amount, the valve The opening is increased to make the air supply volume meet the requirements.
Whenever you grab your remote and turn on the TV, there are numerous ads promoting mass flow meter and offering for v shape coriolis mass flow meter extracts, which are said to boost endress hauser ultrasonic flow meter.
With comprehensive knowledge on mass flow meter,why not visit the highly recommended site Sincerity Mass Flow Meter Manufacturers to get a full appreciation of the best ?
Beijing Sincerity Automatic Equipment Co., Ltd has unique staffs who will serve you with their best ideas by affording you with high-quality service.
The lower cost of mass flow meter, compared to other product, and Beijing Sincerity Automatic Equipment Co., Ltd’s services provide may well suit the needs for customers.
Producing with varied technical skills, mass flow meter can be used in a wide range of applications as low flow turbine flow meter.