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Installation instructions for JL-PDF cross-sectional flowmeter
Installation Instructions for JL-PDF Cross Sectional Flow Meter I. Overview The working principle of JL-PDF Cross Sectional Flow Meter is that there a
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Installation instructions for JL-PDF cross-sectional flowmeter
1、 OverviewThe working principle of JL-PDF cross-sectional flowmeter is that there is not enough straight pipe section, and the flow velocity at each point on the pipeline cross-section is different. It is difficult to find a point that can represent the average flow velocity, and the actual wind speed distribution does not have a certain rule to follow. We divide the size and cross-sectional area of rectangular or circular pipelines into several small units with the same area. The JL-PDF cross-sectional flowmeter measures the flow velocity at the center point of each small unit and then aggregates the flow velocities of all small units into an average value, which is the average flow velocity of the entire cross-sectional area, known as the velocity area method. The more the unit area is divided, the more accurate the flow velocity measured by the cross-sectional flowmeter. The cross-sectional flowmeter is designed based on this principle and has been proven in practical applications.
2、 Purpose and Characteristics
The load, coal powder quantity, and air distribution of coal-fired boilers in power plants need to be monitored and automatically controlled online to ensure reasonable primary and secondary air distribution, uniform air velocity in each duct, stable combustion of the boiler, and improved efficiency. This is essential for technical analysis and economic accounting of the production process. The JL-PDF cross-sectional airflow measurement device is a new type of flow sensor designed and manufactured based on the measurement principle of velocity area method. It measures the cross-sectional area of a closed pipeline (circular, rectangular, or other irregular cross-section pipelines) and the axial average flow velocity of the fluid passing through that area. Multiple structurally unique detection devices are installed inside the pipeline according to the different cross-sectional shapes and sizes of the pipeline being measured. Obtain the average differential pressure through pressure equalization. The installation requirements are low. As long as there is a straight pipe section of 250-300mm, it can be installed with self rectifying function, which is not affected by irregular fluids or even multi-directional rotating airflow. The pressure loss is small, only 10% of that of the wing wind measurement device. Its flow coefficient is stable and does not require on-site calibration. Online blowing and maintenance can be carried out through anti blocking blowing devices. Good long-term stability, wide applicability, simple structure, easy to operate, and easy to troubleshoot. No need for a straight pipe structure, cross-sectional air flow measurement device
3、 Installation requirements and precautions
1. It can meet the installation requirements of any secondary air duct, as long as there is a 250-300mm long installation position, it can be installed.
2. No on-site calibration is required. For general flow meters, due to different usage and calibration conditions, in order to make the measurement results more in line with the actual situation, on-site calibration is usually required after installation to determine the coefficient K. However, cross-sectional flow meters do not require on-site calibration at all. One of the reasons is that it has a different opening method for pressure measuring holes compared to all other flow meters. This special opening method does not require a flow coefficient, that is, V=(2 △ P/p). From the formula, it can be seen that the flow velocity V is only related to △ P and density p, and is not related to the flow coefficient K; The second reason is that due to the complexity of the secondary air duct and the irregularity of the fluid state, the flow meter used as a standard also loses its conditions as a standard in this situation. The calibration calculation using points instead of surfaces or lines instead of surfaces results in significant errors; The third reason is the principle of cross-sectional measurement structure, which makes its measurement accuracy higher than the calibration accuracy of standard flow meters. Any standard flow meter and any calibration method are inferior to cross-sectional flow meters;
3. Not affected by irregular fluids or even multi-directional rotating airflow;
4. The pressure loss is minimal.
5. The requirements for straight pipe sections are low, and no straight pipe sections are needed. As long as there is an installation position of 250-300mm, accurate measurement can be guaranteed.
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