What are the characteristics of the throttling device for biomass boilers?

2019-09-06

There are many important devices in biomass boilers. If you don’t want to miss important information, you must find out what role different important devices have, so that it will not affect everyone’s use. So what are the functions of important devices in the process of operation that cannot be ignored?

Biomass boilers are designed, manufactured, installed and used in accordance with the national standard GB/T2624-93 “Flow Measurement Standards Throttling Device Design, Installation and Use Manual” throttling device called “standard throttling device”. The advantage is that the relationship between the flow rate and the differential pressure can be directly calculated by the data provided by the standard without having to be obtained by calibration or calibration. The above national standard corresponds to the ISO5167-1 standard promoted by ISO (International Organization for Standardization).

The standard throttling device is only suitable for measuring the flow of single-phase, homogeneous fluid in a circular pipe. It requires the fluid to fill the pipeline, no phase change or precipitation of impurities within a certain distance before and after the throttle, and the flow rate is less than the speed of sound. The flow is a non-pulsating flow, and the flow of the fluid before the flow through the throttle is parallel to the axis of the pipe and there must be no swirling flow. The flow condition is a fully developed turbulence.

Standard throttling devices are divided into standard orifices, standard nozzles and long diameter nozzles.

The standard orifice plate of biomass boiler is characterized by simple processing and low cost, and its disadvantage is that the flow pressure loss of the fluid is large; the characteristics of the standard nozzle are exactly opposite to those of the standard orifice plate. Long-diameter nozzles are suitable for measurements with low Reynolds number flow.

The pressure-receiving method of the standard orifice plate of the biomass boiler is two types: the angle connection pressure and the flange pressure method. Among them, the corner joint pressure method is divided into two types: the ring chamber pressure method and the single hole pressure method.

The outflow coefficient of the standard throttling device of the biomass boiler is obtained through experiments under the condition that the fluid upstream of the throttle member is a typical turbulent flow. Therefore, all kinds of factors that disturb the flow field in use: such as the length of straight pipe, the type of resistance, etc., must be limited and regulated. In particular, the front and rear end faces of the throttle member cannot be reversed, and the end faces must be perpendicular to the flow direction and on the coaxial core line. After installation, the pipeline must be flushed and sooted by the biomass boiler and then loaded into the throttle

The above is the introduction of the role of the throttling device in the biomass boiler and the analysis of its working principle, I hope to help everyone.

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