Thermal type gas mass flowmeter is analysed scale installation and signal and blast aeration

Abstract: the thermal type gas mass flowmeter is analysed scale installation and signal and blast aeration information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Thermal type gas mass flowmeter and reliable measurement accuracy and repeatability, and the scene of free maintenance, make the product has an important role in the cascade control system is becoming more and more obvious. Its successful use not only to improve the performance of the control system, also for the quality of sewage treatment. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a thermal type gas mass flowmeter is analysed scale installation and signal and blast aeration article details. Thermal type gas mass flowmeter and reliable measurement accuracy and repeatability, and the scene of free maintenance, make the product has an important role in the cascade control system is becoming more and more obvious. Its successful use not only to improve the performance of the control system, also provides important guarantee for the sewage treatment standard quality. The stand or fall of thermal type gas mass flowmeter using effect depends on the correct installation and signal connections. ST98 output current signal is active 4 ~ 20 mA, in order to connect with the existing control system, need to add signal converter is converted to a passive 4 ~ 20 mA standard signal, as shown in figure 3. Air duct by ST98 air flow measurement, in addition to the scene in situ show that instantaneous/cumulative flow, 4 ~ 20 mA output signal receiving, processing after converter by PLC, after the comparison with the given value which can adjust the air flow. With air volume adjustment, can realize cascade control aeration system, to better meet the requirements of automatic adjustment of dissolved oxygen. Sewage treatment plant aeration pool of dissolved oxygen (do) is a key parameter of wastewater treatment process, to control in a certain concentration. Excess aeration can increase energy consumption, increase the cost of sewage treatment, insufficient aeration can make drop low dissolved oxygen, is not conducive to microbial growth in water, zui will affect the effect of sewage treatment. Dissolved oxygen concentration and water quality, temperature, pressure, air and so on has a very close relationship, when the outside conditions change, dissolved oxygen concentration has been changed. In the above factors, only air can be artificially controlled and so on with dissolved oxygen as the feedback loop thermal type gas mass flowmeter in the closed loop control system, the introduction of air volume adjustment, implementation of dissolved oxygen, cascade control, can make better effect, as shown in figure 4. Can be seen from the diagram, the dissolved oxygen (do) ( DO) Regulator and air conditioner, concatenated DO the output of the controller is as given value of air conditioner, controlled by the air conditioner regulator action. DO as the main to adjust parameters, it is a process to control indicators. Air is the deputy to adjust parameters, it is to stabilize the tone and introducing auxiliary parameters. DO regulator according to the main parameters and process the deviation of a given value of work, its output as the given value of the air conditioner, DO regulator plays a leading role in the system. Air conditioner according to the flow that a pair of parameters and the DO regulator of the deviation of a given value, the output control regulator directly. Under normal circumstances, assuming that feed water quantity, water quality, water temperature and other conditions are the same, blower outlet pressure, the air is the same, oxygen consumption rate and oxygen filling rate basic balance, dissolved oxygen concentration on the given value. When some factors change destroyed the balance, regulator that is working. ( 1) Changed due to some reason the flow of air duct, flowmeter measurement to this change, response to the input end of the flow regulator, the air conditioner to adjust in time, change the valve opening, if the change is small, after the class, before the changes did not affect the parameters of the dissolved oxygen was overcome. If the change is bigger, because most of the air volume link overcome, then by large loop further adjustment, to eliminate the change, the impact on restoring the dissolved oxygen (do) to the given value. ( 2) Due to the aeration tank of water quantity and water quality changed, destroyed the original balance, also resulted in the changes of dissolved oxygen aeration, two stage regulator works at the same time, speed up the adjustment. ( 3) If this change also resulted in the changes of dissolved oxygen, traffic, at the same time, the direction of two regulator control of the regulating valve in the same direction, speed up the adjustment function, make the lead role, is helpful for the improvement of the regulating quality. The change in the opposite direction, the stability of dissolved oxygen must guarantee, work must be conducted in accordance with the requirements of the dissolved oxygen, because the two thermal type gas mass flowmeter regulator in the opposite direction, offset, deviation greatly decreases, and the regulator as long as the slightest move, can make the system balance. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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